Distinguish between right and left mouse click for wind and dragging

[cloth_sim] / Scripts / three.module.js

// threejs.org/license
const REVISION = '123';
const MOUSE = { LEFT: 0, MIDDLE: 1, RIGHT: 2, ROTATE: 0, DOLLY: 1, PAN: 2 };
const TOUCH = { ROTATE: 0, PAN: 1, DOLLY_PAN: 2, DOLLY_ROTATE: 3 };
const CullFaceNone = 0;
const CullFaceBack = 1;
const CullFaceFront = 2;
const CullFaceFrontBack = 3;
const BasicShadowMap = 0;
const PCFShadowMap = 1;
const PCFSoftShadowMap = 2;
const VSMShadowMap = 3;
const FrontSide = 0;
const BackSide = 1;
const DoubleSide = 2;
const FlatShading = 1;
const SmoothShading = 2;
const NoBlending = 0;
const NormalBlending = 1;
const AdditiveBlending = 2;
const SubtractiveBlending = 3;
const MultiplyBlending = 4;
const CustomBlending = 5;
const AddEquation = 100;
const SubtractEquation = 101;
const ReverseSubtractEquation = 102;
const MinEquation = 103;
const MaxEquation = 104;
const ZeroFactor = 200;
const OneFactor = 201;
const SrcColorFactor = 202;
const OneMinusSrcColorFactor = 203;
const SrcAlphaFactor = 204;
const OneMinusSrcAlphaFactor = 205;
const DstAlphaFactor = 206;
const OneMinusDstAlphaFactor = 207;
const DstColorFactor = 208;
const OneMinusDstColorFactor = 209;
const SrcAlphaSaturateFactor = 210;
const NeverDepth = 0;
const AlwaysDepth = 1;
const LessDepth = 2;
const LessEqualDepth = 3;
const EqualDepth = 4;
const GreaterEqualDepth = 5;
const GreaterDepth = 6;
const NotEqualDepth = 7;
const MultiplyOperation = 0;
const MixOperation = 1;
const AddOperation = 2;
const NoToneMapping = 0;
const LinearToneMapping = 1;
const ReinhardToneMapping = 2;
const CineonToneMapping = 3;
const ACESFilmicToneMapping = 4;
const CustomToneMapping = 5;

const UVMapping = 300;
const CubeReflectionMapping = 301;
const CubeRefractionMapping = 302;
const EquirectangularReflectionMapping = 303;
const EquirectangularRefractionMapping = 304;
const CubeUVReflectionMapping = 306;
const CubeUVRefractionMapping = 307;
const RepeatWrapping = 1000;
const ClampToEdgeWrapping = 1001;
const MirroredRepeatWrapping = 1002;
const NearestFilter = 1003;
const NearestMipmapNearestFilter = 1004;
const NearestMipMapNearestFilter = 1004;
const NearestMipmapLinearFilter = 1005;
const NearestMipMapLinearFilter = 1005;
const LinearFilter = 1006;
const LinearMipmapNearestFilter = 1007;
const LinearMipMapNearestFilter = 1007;
const LinearMipmapLinearFilter = 1008;
const LinearMipMapLinearFilter = 1008;
const UnsignedByteType = 1009;
const ByteType = 1010;
const ShortType = 1011;
const UnsignedShortType = 1012;
const IntType = 1013;
const UnsignedIntType = 1014;
const FloatType = 1015;
const HalfFloatType = 1016;
const UnsignedShort4444Type = 1017;
const UnsignedShort5551Type = 1018;
const UnsignedShort565Type = 1019;
const UnsignedInt248Type = 1020;
const AlphaFormat = 1021;
const RGBFormat = 1022;
const RGBAFormat = 1023;
const LuminanceFormat = 1024;
const LuminanceAlphaFormat = 1025;
const RGBEFormat = RGBAFormat;
const DepthFormat = 1026;
const DepthStencilFormat = 1027;
const RedFormat = 1028;
const RedIntegerFormat = 1029;
const RGFormat = 1030;
const RGIntegerFormat = 1031;
const RGBIntegerFormat = 1032;
const RGBAIntegerFormat = 1033;

const RGB_S3TC_DXT1_Format = 33776;
const RGBA_S3TC_DXT1_Format = 33777;
const RGBA_S3TC_DXT3_Format = 33778;
const RGBA_S3TC_DXT5_Format = 33779;
const RGB_PVRTC_4BPPV1_Format = 35840;
const RGB_PVRTC_2BPPV1_Format = 35841;
const RGBA_PVRTC_4BPPV1_Format = 35842;
const RGBA_PVRTC_2BPPV1_Format = 35843;
const RGB_ETC1_Format = 36196;
const RGB_ETC2_Format = 37492;
const RGBA_ETC2_EAC_Format = 37496;
const RGBA_ASTC_4x4_Format = 37808;
const RGBA_ASTC_5x4_Format = 37809;
const RGBA_ASTC_5x5_Format = 37810;
const RGBA_ASTC_6x5_Format = 37811;
const RGBA_ASTC_6x6_Format = 37812;
const RGBA_ASTC_8x5_Format = 37813;
const RGBA_ASTC_8x6_Format = 37814;
const RGBA_ASTC_8x8_Format = 37815;
const RGBA_ASTC_10x5_Format = 37816;
const RGBA_ASTC_10x6_Format = 37817;
const RGBA_ASTC_10x8_Format = 37818;
const RGBA_ASTC_10x10_Format = 37819;
const RGBA_ASTC_12x10_Format = 37820;
const RGBA_ASTC_12x12_Format = 37821;
const RGBA_BPTC_Format = 36492;
const SRGB8_ALPHA8_ASTC_4x4_Format = 37840;
const SRGB8_ALPHA8_ASTC_5x4_Format = 37841;
const SRGB8_ALPHA8_ASTC_5x5_Format = 37842;
const SRGB8_ALPHA8_ASTC_6x5_Format = 37843;
const SRGB8_ALPHA8_ASTC_6x6_Format = 37844;
const SRGB8_ALPHA8_ASTC_8x5_Format = 37845;
const SRGB8_ALPHA8_ASTC_8x6_Format = 37846;
const SRGB8_ALPHA8_ASTC_8x8_Format = 37847;
const SRGB8_ALPHA8_ASTC_10x5_Format = 37848;
const SRGB8_ALPHA8_ASTC_10x6_Format = 37849;
const SRGB8_ALPHA8_ASTC_10x8_Format = 37850;
const SRGB8_ALPHA8_ASTC_10x10_Format = 37851;
const SRGB8_ALPHA8_ASTC_12x10_Format = 37852;
const SRGB8_ALPHA8_ASTC_12x12_Format = 37853;
const LoopOnce = 2200;
const LoopRepeat = 2201;
const LoopPingPong = 2202;
const InterpolateDiscrete = 2300;
const InterpolateLinear = 2301;
const InterpolateSmooth = 2302;
const ZeroCurvatureEnding = 2400;
const ZeroSlopeEnding = 2401;
const WrapAroundEnding = 2402;
const NormalAnimationBlendMode = 2500;
const AdditiveAnimationBlendMode = 2501;
const TrianglesDrawMode = 0;
const TriangleStripDrawMode = 1;
const TriangleFanDrawMode = 2;
const LinearEncoding = 3000;
const sRGBEncoding = 3001;
const GammaEncoding = 3007;
const RGBEEncoding = 3002;
const LogLuvEncoding = 3003;
const RGBM7Encoding = 3004;
const RGBM16Encoding = 3005;
const RGBDEncoding = 3006;
const BasicDepthPacking = 3200;
const RGBADepthPacking = 3201;
const TangentSpaceNormalMap = 0;
const ObjectSpaceNormalMap = 1;

const ZeroStencilOp = 0;
const KeepStencilOp = 7680;
const ReplaceStencilOp = 7681;
const IncrementStencilOp = 7682;
const DecrementStencilOp = 7683;
const IncrementWrapStencilOp = 34055;
const DecrementWrapStencilOp = 34056;
const InvertStencilOp = 5386;

const NeverStencilFunc = 512;
const LessStencilFunc = 513;
const EqualStencilFunc = 514;
const LessEqualStencilFunc = 515;
const GreaterStencilFunc = 516;
const NotEqualStencilFunc = 517;
const GreaterEqualStencilFunc = 518;
const AlwaysStencilFunc = 519;

const StaticDrawUsage = 35044;
const DynamicDrawUsage = 35048;
const StreamDrawUsage = 35040;
const StaticReadUsage = 35045;
const DynamicReadUsage = 35049;
const StreamReadUsage = 35041;
const StaticCopyUsage = 35046;
const DynamicCopyUsage = 35050;
const StreamCopyUsage = 35042;

const GLSL1 = "100";
const GLSL3 = "300 es";

/**
 * https://github.com/mrdoob/eventdispatcher.js/
 */

function EventDispatcher() {}

Object.assign( EventDispatcher.prototype, {

        addEventListener: function ( type, listener ) {

                if ( this._listeners === undefined ) this._listeners = {};

                const listeners = this._listeners;

                if ( listeners[ type ] === undefined ) {

                        listeners[ type ] = [];

                }

                if ( listeners[ type ].indexOf( listener ) === - 1 ) {

                        listeners[ type ].push( listener );

                }

        },

        hasEventListener: function ( type, listener ) {

                if ( this._listeners === undefined ) return false;

                const listeners = this._listeners;

                return listeners[ type ] !== undefined && listeners[ type ].indexOf( listener ) !== - 1;

        },

        removeEventListener: function ( type, listener ) {

                if ( this._listeners === undefined ) return;

                const listeners = this._listeners;
                const listenerArray = listeners[ type ];

                if ( listenerArray !== undefined ) {

                        const index = listenerArray.indexOf( listener );

                        if ( index !== - 1 ) {

                                listenerArray.splice( index, 1 );

                        }

                }

        },

        dispatchEvent: function ( event ) {

                if ( this._listeners === undefined ) return;

                const listeners = this._listeners;
                const listenerArray = listeners[ event.type ];

                if ( listenerArray !== undefined ) {

                        event.target = this;

                        // Make a copy, in case listeners are removed while iterating.
                        const array = listenerArray.slice( 0 );

                        for ( let i = 0, l = array.length; i < l; i ++ ) {

                                array[ i ].call( this, event );

                        }

                }

        }

} );

const _lut = [];

for ( let i = 0; i < 256; i ++ ) {

        _lut[ i ] = ( i < 16 ? '0' : '' ) + ( i ).toString( 16 );

}

let _seed = 1234567;

const MathUtils = {

        DEG2RAD: Math.PI / 180,
        RAD2DEG: 180 / Math.PI,

        generateUUID: function () {

                // http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/21963136#21963136

                const d0 = Math.random() * 0xffffffff | 0;
                const d1 = Math.random() * 0xffffffff | 0;
                const d2 = Math.random() * 0xffffffff | 0;
                const d3 = Math.random() * 0xffffffff | 0;
                const uuid = _lut[ d0 & 0xff ] + _lut[ d0 >> 8 & 0xff ] + _lut[ d0 >> 16 & 0xff ] + _lut[ d0 >> 24 & 0xff ] + '-' +
                        _lut[ d1 & 0xff ] + _lut[ d1 >> 8 & 0xff ] + '-' + _lut[ d1 >> 16 & 0x0f | 0x40 ] + _lut[ d1 >> 24 & 0xff ] + '-' +
                        _lut[ d2 & 0x3f | 0x80 ] + _lut[ d2 >> 8 & 0xff ] + '-' + _lut[ d2 >> 16 & 0xff ] + _lut[ d2 >> 24 & 0xff ] +
                        _lut[ d3 & 0xff ] + _lut[ d3 >> 8 & 0xff ] + _lut[ d3 >> 16 & 0xff ] + _lut[ d3 >> 24 & 0xff ];

                // .toUpperCase() here flattens concatenated strings to save heap memory space.
                return uuid.toUpperCase();

        },

        clamp: function ( value, min, max ) {

                return Math.max( min, Math.min( max, value ) );

        },

        // compute euclidian modulo of m % n
        // https://en.wikipedia.org/wiki/Modulo_operation

        euclideanModulo: function ( n, m ) {

                return ( ( n % m ) + m ) % m;

        },

        // Linear mapping from range <a1, a2> to range <b1, b2>

        mapLinear: function ( x, a1, a2, b1, b2 ) {

                return b1 + ( x - a1 ) * ( b2 - b1 ) / ( a2 - a1 );

        },

        // https://en.wikipedia.org/wiki/Linear_interpolation

        lerp: function ( x, y, t ) {

                return ( 1 - t ) * x + t * y;

        },

        // http://en.wikipedia.org/wiki/Smoothstep

        smoothstep: function ( x, min, max ) {

                if ( x <= min ) return 0;
                if ( x >= max ) return 1;

                x = ( x - min ) / ( max - min );

                return x * x * ( 3 - 2 * x );

        },

        smootherstep: function ( x, min, max ) {

                if ( x <= min ) return 0;
                if ( x >= max ) return 1;

                x = ( x - min ) / ( max - min );

                return x * x * x * ( x * ( x * 6 - 15 ) + 10 );

        },

        // Random integer from <low, high> interval

        randInt: function ( low, high ) {

                return low + Math.floor( Math.random() * ( high - low + 1 ) );

        },

        // Random float from <low, high> interval

        randFloat: function ( low, high ) {

                return low + Math.random() * ( high - low );

        },

        // Random float from <-range/2, range/2> interval

        randFloatSpread: function ( range ) {

                return range * ( 0.5 - Math.random() );

        },

        // Deterministic pseudo-random float in the interval [ 0, 1 ]

        seededRandom: function ( s ) {

                if ( s !== undefined ) _seed = s % 2147483647;

                // Park-Miller algorithm

                _seed = _seed * 16807 % 2147483647;

                return ( _seed - 1 ) / 2147483646;

        },

        degToRad: function ( degrees ) {

                return degrees * MathUtils.DEG2RAD;

        },

        radToDeg: function ( radians ) {

                return radians * MathUtils.RAD2DEG;

        },

        isPowerOfTwo: function ( value ) {

                return ( value & ( value - 1 ) ) === 0 && value !== 0;

        },

        ceilPowerOfTwo: function ( value ) {

                return Math.pow( 2, Math.ceil( Math.log( value ) / Math.LN2 ) );

        },

        floorPowerOfTwo: function ( value ) {

                return Math.pow( 2, Math.floor( Math.log( value ) / Math.LN2 ) );

        },

        setQuaternionFromProperEuler: function ( q, a, b, c, order ) {

                // Intrinsic Proper Euler Angles - see https://en.wikipedia.org/wiki/Euler_angles

                // rotations are applied to the axes in the order specified by 'order'
                // rotation by angle 'a' is applied first, then by angle 'b', then by angle 'c'
                // angles are in radians

                const cos = Math.cos;
                const sin = Math.sin;

                const c2 = cos( b / 2 );
                const s2 = sin( b / 2 );

                const c13 = cos( ( a + c ) / 2 );
                const s13 = sin( ( a + c ) / 2 );

                const c1_3 = cos( ( a - c ) / 2 );
                const s1_3 = sin( ( a - c ) / 2 );

                const c3_1 = cos( ( c - a ) / 2 );
                const s3_1 = sin( ( c - a ) / 2 );

                switch ( order ) {

                        case 'XYX':
                                q.set( c2 * s13, s2 * c1_3, s2 * s1_3, c2 * c13 );
                                break;

                        case 'YZY':
                                q.set( s2 * s1_3, c2 * s13, s2 * c1_3, c2 * c13 );
                                break;

                        case 'ZXZ':
                                q.set( s2 * c1_3, s2 * s1_3, c2 * s13, c2 * c13 );
                                break;

                        case 'XZX':
                                q.set( c2 * s13, s2 * s3_1, s2 * c3_1, c2 * c13 );
                                break;

                        case 'YXY':
                                q.set( s2 * c3_1, c2 * s13, s2 * s3_1, c2 * c13 );
                                break;

                        case 'ZYZ':
                                q.set( s2 * s3_1, s2 * c3_1, c2 * s13, c2 * c13 );
                                break;

                        default:
                                console.warn( 'THREE.MathUtils: .setQuaternionFromProperEuler() encountered an unknown order: ' + order );

                }

        }

};

class Vector2 {

        constructor( x = 0, y = 0 ) {

                Object.defineProperty( this, 'isVector2', { value: true } );

                this.x = x;
                this.y = y;

        }

        get width() {

                return this.x;

        }

        set width( value ) {

                this.x = value;

        }

        get height() {

                return this.y;

        }

        set height( value ) {

                this.y = value;

        }

        set( x, y ) {

                this.x = x;
                this.y = y;

                return this;

        }

        setScalar( scalar ) {

                this.x = scalar;
                this.y = scalar;

                return this;

        }

        setX( x ) {

                this.x = x;

                return this;

        }

        setY( y ) {

                this.y = y;

                return this;

        }

        setComponent( index, value ) {

                switch ( index ) {

                        case 0: this.x = value; break;
                        case 1: this.y = value; break;
                        default: throw new Error( 'index is out of range: ' + index );

                }

                return this;

        }

        getComponent( index ) {

                switch ( index ) {

                        case 0: return this.x;
                        case 1: return this.y;
                        default: throw new Error( 'index is out of range: ' + index );

                }

        }

        clone() {

                return new this.constructor( this.x, this.y );

        }

        copy( v ) {

                this.x = v.x;
                this.y = v.y;

                return this;

        }

        add( v, w ) {

                if ( w !== undefined ) {

                        console.warn( 'THREE.Vector2: .add() now only accepts one argument. Use .addVectors( a, b ) instead.' );
                        return this.addVectors( v, w );

                }

                this.x += v.x;
                this.y += v.y;

                return this;

        }

        addScalar( s ) {

                this.x += s;
                this.y += s;

                return this;

        }

        addVectors( a, b ) {

                this.x = a.x + b.x;
                this.y = a.y + b.y;

                return this;

        }

        addScaledVector( v, s ) {

                this.x += v.x * s;
                this.y += v.y * s;

                return this;

        }

        sub( v, w ) {

                if ( w !== undefined ) {

                        console.warn( 'THREE.Vector2: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.' );
                        return this.subVectors( v, w );

                }

                this.x -= v.x;
                this.y -= v.y;

                return this;

        }

        subScalar( s ) {

                this.x -= s;
                this.y -= s;

                return this;

        }

        subVectors( a, b ) {

                this.x = a.x - b.x;
                this.y = a.y - b.y;

                return this;

        }

        multiply( v ) {

                this.x *= v.x;
                this.y *= v.y;

                return this;

        }

        multiplyScalar( scalar ) {

                this.x *= scalar;
                this.y *= scalar;

                return this;

        }

        divide( v ) {

                this.x /= v.x;
                this.y /= v.y;

                return this;

        }

        divideScalar( scalar ) {

                return this.multiplyScalar( 1 / scalar );

        }

        applyMatrix3( m ) {

                const x = this.x, y = this.y;
                const e = m.elements;

                this.x = e[ 0 ] * x + e[ 3 ] * y + e[ 6 ];
                this.y = e[ 1 ] * x + e[ 4 ] * y + e[ 7 ];

                return this;

        }

        min( v ) {

                this.x = Math.min( this.x, v.x );
                this.y = Math.min( this.y, v.y );

                return this;

        }

        max( v ) {

                this.x = Math.max( this.x, v.x );
                this.y = Math.max( this.y, v.y );

                return this;

        }

        clamp( min, max ) {

                // assumes min < max, componentwise

                this.x = Math.max( min.x, Math.min( max.x, this.x ) );
                this.y = Math.max( min.y, Math.min( max.y, this.y ) );

                return this;

        }

        clampScalar( minVal, maxVal ) {

                this.x = Math.max( minVal, Math.min( maxVal, this.x ) );
                this.y = Math.max( minVal, Math.min( maxVal, this.y ) );

                return this;

        }

        clampLength( min, max ) {

                const length = this.length();

                return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );

        }

        floor() {

                this.x = Math.floor( this.x );
                this.y = Math.floor( this.y );

                return this;

        }

        ceil() {

                this.x = Math.ceil( this.x );
                this.y = Math.ceil( this.y );

                return this;

        }

        round() {

                this.x = Math.round( this.x );
                this.y = Math.round( this.y );

                return this;

        }

        roundToZero() {

                this.x = ( this.x < 0 ) ? Math.ceil( this.x ) : Math.floor( this.x );
                this.y = ( this.y < 0 ) ? Math.ceil( this.y ) : Math.floor( this.y );

                return this;

        }

        negate() {

                this.x = - this.x;
                this.y = - this.y;

                return this;

        }

        dot( v ) {

                return this.x * v.x + this.y * v.y;

        }

        cross( v ) {

                return this.x * v.y - this.y * v.x;

        }

        lengthSq() {

                return this.x * this.x + this.y * this.y;

        }

        length() {

                return Math.sqrt( this.x * this.x + this.y * this.y );

        }

        manhattanLength() {

                return Math.abs( this.x ) + Math.abs( this.y );

        }

        normalize() {

                return this.divideScalar( this.length() || 1 );

        }

        angle() {

                // computes the angle in radians with respect to the positive x-axis

                const angle = Math.atan2( - this.y, - this.x ) + Math.PI;

                return angle;

        }

        distanceTo( v ) {

                return Math.sqrt( this.distanceToSquared( v ) );

        }

        distanceToSquared( v ) {

                const dx = this.x - v.x, dy = this.y - v.y;
                return dx * dx + dy * dy;

        }

        manhattanDistanceTo( v ) {

                return Math.abs( this.x - v.x ) + Math.abs( this.y - v.y );

        }

        setLength( length ) {

                return this.normalize().multiplyScalar( length );

        }

        lerp( v, alpha ) {

                this.x += ( v.x - this.x ) * alpha;
                this.y += ( v.y - this.y ) * alpha;

                return this;

        }

        lerpVectors( v1, v2, alpha ) {

                this.x = v1.x + ( v2.x - v1.x ) * alpha;
                this.y = v1.y + ( v2.y - v1.y ) * alpha;

                return this;

        }

        equals( v ) {

                return ( ( v.x === this.x ) && ( v.y === this.y ) );

        }

        fromArray( array, offset = 0 ) {

                this.x = array[ offset ];
                this.y = array[ offset + 1 ];

                return this;

        }

        toArray( array = [], offset = 0 ) {

                array[ offset ] = this.x;
                array[ offset + 1 ] = this.y;

                return array;

        }

        fromBufferAttribute( attribute, index, offset ) {

                if ( offset !== undefined ) {

                        console.warn( 'THREE.Vector2: offset has been removed from .fromBufferAttribute().' );

                }

                this.x = attribute.getX( index );
                this.y = attribute.getY( index );

                return this;

        }

        rotateAround( center, angle ) {

                const c = Math.cos( angle ), s = Math.sin( angle );

                const x = this.x - center.x;
                const y = this.y - center.y;

                this.x = x * c - y * s + center.x;
                this.y = x * s + y * c + center.y;

                return this;

        }

        random() {

                this.x = Math.random();
                this.y = Math.random();

                return this;

        }

}

class Matrix3 {

        constructor() {

                Object.defineProperty( this, 'isMatrix3', { value: true } );

                this.elements = [

                        1, 0, 0,
                        0, 1, 0,
                        0, 0, 1

                ];

                if ( arguments.length > 0 ) {

                        console.error( 'THREE.Matrix3: the constructor no longer reads arguments. use .set() instead.' );

                }

        }

        set( n11, n12, n13, n21, n22, n23, n31, n32, n33 ) {

                const te = this.elements;

                te[ 0 ] = n11; te[ 1 ] = n21; te[ 2 ] = n31;
                te[ 3 ] = n12; te[ 4 ] = n22; te[ 5 ] = n32;
                te[ 6 ] = n13; te[ 7 ] = n23; te[ 8 ] = n33;

                return this;

        }

        identity() {

                this.set(

                        1, 0, 0,
                        0, 1, 0,
                        0, 0, 1

                );

                return this;

        }

        clone() {

                return new this.constructor().fromArray( this.elements );

        }

        copy( m ) {

                const te = this.elements;
                const me = m.elements;

                te[ 0 ] = me[ 0 ]; te[ 1 ] = me[ 1 ]; te[ 2 ] = me[ 2 ];
                te[ 3 ] = me[ 3 ]; te[ 4 ] = me[ 4 ]; te[ 5 ] = me[ 5 ];
                te[ 6 ] = me[ 6 ]; te[ 7 ] = me[ 7 ]; te[ 8 ] = me[ 8 ];

                return this;

        }

        extractBasis( xAxis, yAxis, zAxis ) {

                xAxis.setFromMatrix3Column( this, 0 );
                yAxis.setFromMatrix3Column( this, 1 );
                zAxis.setFromMatrix3Column( this, 2 );

                return this;

        }

        setFromMatrix4( m ) {

                const me = m.elements;

                this.set(

                        me[ 0 ], me[ 4 ], me[ 8 ],
                        me[ 1 ], me[ 5 ], me[ 9 ],
                        me[ 2 ], me[ 6 ], me[ 10 ]

                );

                return this;

        }

        multiply( m ) {

                return this.multiplyMatrices( this, m );

        }

        premultiply( m ) {

                return this.multiplyMatrices( m, this );

        }

        multiplyMatrices( a, b ) {

                const ae = a.elements;
                const be = b.elements;
                const te = this.elements;

                const a11 = ae[ 0 ], a12 = ae[ 3 ], a13 = ae[ 6 ];
                const a21 = ae[ 1 ], a22 = ae[ 4 ], a23 = ae[ 7 ];
                const a31 = ae[ 2 ], a32 = ae[ 5 ], a33 = ae[ 8 ];

                const b11 = be[ 0 ], b12 = be[ 3 ], b13 = be[ 6 ];
                const b21 = be[ 1 ], b22 = be[ 4 ], b23 = be[ 7 ];
                const b31 = be[ 2 ], b32 = be[ 5 ], b33 = be[ 8 ];

                te[ 0 ] = a11 * b11 + a12 * b21 + a13 * b31;
                te[ 3 ] = a11 * b12 + a12 * b22 + a13 * b32;
                te[ 6 ] = a11 * b13 + a12 * b23 + a13 * b33;

                te[ 1 ] = a21 * b11 + a22 * b21 + a23 * b31;
                te[ 4 ] = a21 * b12 + a22 * b22 + a23 * b32;
                te[ 7 ] = a21 * b13 + a22 * b23 + a23 * b33;

                te[ 2 ] = a31 * b11 + a32 * b21 + a33 * b31;
                te[ 5 ] = a31 * b12 + a32 * b22 + a33 * b32;
                te[ 8 ] = a31 * b13 + a32 * b23 + a33 * b33;

                return this;

        }

        multiplyScalar( s ) {

                const te = this.elements;

                te[ 0 ] *= s; te[ 3 ] *= s; te[ 6 ] *= s;
                te[ 1 ] *= s; te[ 4 ] *= s; te[ 7 ] *= s;
                te[ 2 ] *= s; te[ 5 ] *= s; te[ 8 ] *= s;

                return this;

        }

        determinant() {

                const te = this.elements;

                const a = te[ 0 ], b = te[ 1 ], c = te[ 2 ],
                        d = te[ 3 ], e = te[ 4 ], f = te[ 5 ],
                        g = te[ 6 ], h = te[ 7 ], i = te[ 8 ];

                return a * e * i - a * f * h - b * d * i + b * f * g + c * d * h - c * e * g;

        }

        invert() {

                const te = this.elements,

                        n11 = te[ 0 ], n21 = te[ 1 ], n31 = te[ 2 ],
                        n12 = te[ 3 ], n22 = te[ 4 ], n32 = te[ 5 ],
                        n13 = te[ 6 ], n23 = te[ 7 ], n33 = te[ 8 ],

                        t11 = n33 * n22 - n32 * n23,
                        t12 = n32 * n13 - n33 * n12,
                        t13 = n23 * n12 - n22 * n13,

                        det = n11 * t11 + n21 * t12 + n31 * t13;

                if ( det === 0 ) return this.set( 0, 0, 0, 0, 0, 0, 0, 0, 0 );

                const detInv = 1 / det;

                te[ 0 ] = t11 * detInv;
                te[ 1 ] = ( n31 * n23 - n33 * n21 ) * detInv;
                te[ 2 ] = ( n32 * n21 - n31 * n22 ) * detInv;

                te[ 3 ] = t12 * detInv;
                te[ 4 ] = ( n33 * n11 - n31 * n13 ) * detInv;
                te[ 5 ] = ( n31 * n12 - n32 * n11 ) * detInv;

                te[ 6 ] = t13 * detInv;
                te[ 7 ] = ( n21 * n13 - n23 * n11 ) * detInv;
                te[ 8 ] = ( n22 * n11 - n21 * n12 ) * detInv;

                return this;

        }

        transpose() {

                let tmp;
                const m = this.elements;

                tmp = m[ 1 ]; m[ 1 ] = m[ 3 ]; m[ 3 ] = tmp;
                tmp = m[ 2 ]; m[ 2 ] = m[ 6 ]; m[ 6 ] = tmp;
                tmp = m[ 5 ]; m[ 5 ] = m[ 7 ]; m[ 7 ] = tmp;

                return this;

        }

        getNormalMatrix( matrix4 ) {

                return this.setFromMatrix4( matrix4 ).copy( this ).invert().transpose();

        }

        transposeIntoArray( r ) {

                const m = this.elements;

                r[ 0 ] = m[ 0 ];
                r[ 1 ] = m[ 3 ];
                r[ 2 ] = m[ 6 ];
                r[ 3 ] = m[ 1 ];
                r[ 4 ] = m[ 4 ];
                r[ 5 ] = m[ 7 ];
                r[ 6 ] = m[ 2 ];
                r[ 7 ] = m[ 5 ];
                r[ 8 ] = m[ 8 ];

                return this;

        }

        setUvTransform( tx, ty, sx, sy, rotation, cx, cy ) {

                const c = Math.cos( rotation );
                const s = Math.sin( rotation );

                this.set(
                        sx * c, sx * s, - sx * ( c * cx + s * cy ) + cx + tx,
                        - sy * s, sy * c, - sy * ( - s * cx + c * cy ) + cy + ty,
                        0, 0, 1
                );

        }

        scale( sx, sy ) {

                const te = this.elements;

                te[ 0 ] *= sx; te[ 3 ] *= sx; te[ 6 ] *= sx;
                te[ 1 ] *= sy; te[ 4 ] *= sy; te[ 7 ] *= sy;

                return this;

        }

        rotate( theta ) {

                const c = Math.cos( theta );
                const s = Math.sin( theta );

                const te = this.elements;

                const a11 = te[ 0 ], a12 = te[ 3 ], a13 = te[ 6 ];
                const a21 = te[ 1 ], a22 = te[ 4 ], a23 = te[ 7 ];

                te[ 0 ] = c * a11 + s * a21;
                te[ 3 ] = c * a12 + s * a22;
                te[ 6 ] = c * a13 + s * a23;

                te[ 1 ] = - s * a11 + c * a21;
                te[ 4 ] = - s * a12 + c * a22;
                te[ 7 ] = - s * a13 + c * a23;

                return this;

        }

        translate( tx, ty ) {

                const te = this.elements;

                te[ 0 ] += tx * te[ 2 ]; te[ 3 ] += tx * te[ 5 ]; te[ 6 ] += tx * te[ 8 ];
                te[ 1 ] += ty * te[ 2 ]; te[ 4 ] += ty * te[ 5 ]; te[ 7 ] += ty * te[ 8 ];

                return this;

        }

        equals( matrix ) {

                const te = this.elements;
                const me = matrix.elements;

                for ( let i = 0; i < 9; i ++ ) {

                        if ( te[ i ] !== me[ i ] ) return false;

                }

                return true;

        }

        fromArray( array, offset = 0 ) {

                for ( let i = 0; i < 9; i ++ ) {

                        this.elements[ i ] = array[ i + offset ];

                }

                return this;

        }

        toArray( array = [], offset = 0 ) {

                const te = this.elements;

                array[ offset ] = te[ 0 ];
                array[ offset + 1 ] = te[ 1 ];
                array[ offset + 2 ] = te[ 2 ];

                array[ offset + 3 ] = te[ 3 ];
                array[ offset + 4 ] = te[ 4 ];
                array[ offset + 5 ] = te[ 5 ];

                array[ offset + 6 ] = te[ 6 ];
                array[ offset + 7 ] = te[ 7 ];
                array[ offset + 8 ] = te[ 8 ];

                return array;

        }

}

let _canvas;

const ImageUtils = {

        getDataURL: function ( image ) {

                if ( /^data:/i.test( image.src ) ) {

                        return image.src;

                }

                if ( typeof HTMLCanvasElement == 'undefined' ) {

                        return image.src;

                }

                let canvas;

                if ( image instanceof HTMLCanvasElement ) {

                        canvas = image;

                } else {

                        if ( _canvas === undefined ) _canvas = document.createElementNS( 'http://www.w3.org/1999/xhtml', 'canvas' );

                        _canvas.width = image.width;
                        _canvas.height = image.height;

                        const context = _canvas.getContext( '2d' );

                        if ( image instanceof ImageData ) {

                                context.putImageData( image, 0, 0 );

                        } else {

                                context.drawImage( image, 0, 0, image.width, image.height );

                        }

                        canvas = _canvas;

                }

                if ( canvas.width > 2048 || canvas.height > 2048 ) {

                        return canvas.toDataURL( 'image/jpeg', 0.6 );

                } else {

                        return canvas.toDataURL( 'image/png' );

                }

        }

};

let textureId = 0;

function Texture( image = Texture.DEFAULT_IMAGE, mapping = Texture.DEFAULT_MAPPING, wrapS = ClampToEdgeWrapping, wrapT = ClampToEdgeWrapping, magFilter = LinearFilter, minFilter = LinearMipmapLinearFilter, format = RGBAFormat, type = UnsignedByteType, anisotropy = 1, encoding = LinearEncoding ) {

        Object.defineProperty( this, 'id', { value: textureId ++ } );

        this.uuid = MathUtils.generateUUID();

        this.name = '';

        this.image = image;
        this.mipmaps = [];

        this.mapping = mapping;

        this.wrapS = wrapS;
        this.wrapT = wrapT;

        this.magFilter = magFilter;
        this.minFilter = minFilter;

        this.anisotropy = anisotropy;

        this.format = format;
        this.internalFormat = null;
        this.type = type;

        this.offset = new Vector2( 0, 0 );
        this.repeat = new Vector2( 1, 1 );
        this.center = new Vector2( 0, 0 );
        this.rotation = 0;

        this.matrixAutoUpdate = true;
        this.matrix = new Matrix3();

        this.generateMipmaps = true;
        this.premultiplyAlpha = false;
        this.flipY = true;
        this.unpackAlignment = 4;       // valid values: 1, 2, 4, 8 (see http://www.khronos.org/opengles/sdk/docs/man/xhtml/glPixelStorei.xml)

        // Values of encoding !== THREE.LinearEncoding only supported on map, envMap and emissiveMap.
        //
        // Also changing the encoding after already used by a Material will not automatically make the Material
        // update. You need to explicitly call Material.needsUpdate to trigger it to recompile.
        this.encoding = encoding;

        this.version = 0;
        this.onUpdate = null;

}

Texture.DEFAULT_IMAGE = undefined;
Texture.DEFAULT_MAPPING = UVMapping;

Texture.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

        constructor: Texture,

        isTexture: true,

        updateMatrix: function () {

                this.matrix.setUvTransform( this.offset.x, this.offset.y, this.repeat.x, this.repeat.y, this.rotation, this.center.x, this.center.y );

        },

        clone: function () {

                return new this.constructor().copy( this );

        },

        copy: function ( source ) {

                this.name = source.name;

                this.image = source.image;
                this.mipmaps = source.mipmaps.slice( 0 );

                this.mapping = source.mapping;

                this.wrapS = source.wrapS;
                this.wrapT = source.wrapT;

                this.magFilter = source.magFilter;
                this.minFilter = source.minFilter;

                this.anisotropy = source.anisotropy;

                this.format = source.format;
                this.internalFormat = source.internalFormat;
                this.type = source.type;

                this.offset.copy( source.offset );
                this.repeat.copy( source.repeat );
                this.center.copy( source.center );
                this.rotation = source.rotation;

                this.matrixAutoUpdate = source.matrixAutoUpdate;
                this.matrix.copy( source.matrix );

                this.generateMipmaps = source.generateMipmaps;
                this.premultiplyAlpha = source.premultiplyAlpha;
                this.flipY = source.flipY;
                this.unpackAlignment = source.unpackAlignment;
                this.encoding = source.encoding;

                return this;

        },

        toJSON: function ( meta ) {

                const isRootObject = ( meta === undefined || typeof meta === 'string' );

                if ( ! isRootObject && meta.textures[ this.uuid ] !== undefined ) {

                        return meta.textures[ this.uuid ];

                }

                const output = {

                        metadata: {
                                version: 4.5,
                                type: 'Texture',
                                generator: 'Texture.toJSON'
                        },

                        uuid: this.uuid,
                        name: this.name,

                        mapping: this.mapping,

                        repeat: [ this.repeat.x, this.repeat.y ],
                        offset: [ this.offset.x, this.offset.y ],
                        center: [ this.center.x, this.center.y ],
                        rotation: this.rotation,

                        wrap: [ this.wrapS, this.wrapT ],

                        format: this.format,
                        type: this.type,
                        encoding: this.encoding,

                        minFilter: this.minFilter,
                        magFilter: this.magFilter,
                        anisotropy: this.anisotropy,

                        flipY: this.flipY,

                        premultiplyAlpha: this.premultiplyAlpha,
                        unpackAlignment: this.unpackAlignment

                };

                if ( this.image !== undefined ) {

                        // TODO: Move to THREE.Image

                        const image = this.image;

                        if ( image.uuid === undefined ) {

                                image.uuid = MathUtils.generateUUID(); // UGH

                        }

                        if ( ! isRootObject && meta.images[ image.uuid ] === undefined ) {

                                let url;

                                if ( Array.isArray( image ) ) {

                                        // process array of images e.g. CubeTexture

                                        url = [];

                                        for ( let i = 0, l = image.length; i < l; i ++ ) {

                                                // check cube texture with data textures

                                                if ( image[ i ].isDataTexture ) {

                                                        url.push( serializeImage( image[ i ].image ) );

                                                } else {

                                                        url.push( serializeImage( image[ i ] ) );

                                                }

                                        }

                                } else {

                                        // process single image

                                        url = serializeImage( image );

                                }

                                meta.images[ image.uuid ] = {
                                        uuid: image.uuid,
                                        url: url
                                };

                        }

                        output.image = image.uuid;

                }

                if ( ! isRootObject ) {

                        meta.textures[ this.uuid ] = output;

                }

                return output;

        },

        dispose: function () {

                this.dispatchEvent( { type: 'dispose' } );

        },

        transformUv: function ( uv ) {

                if ( this.mapping !== UVMapping ) return uv;

                uv.applyMatrix3( this.matrix );

                if ( uv.x < 0 || uv.x > 1 ) {

                        switch ( this.wrapS ) {

                                case RepeatWrapping:

                                        uv.x = uv.x - Math.floor( uv.x );
                                        break;

                                case ClampToEdgeWrapping:

                                        uv.x = uv.x < 0 ? 0 : 1;
                                        break;

                                case MirroredRepeatWrapping:

                                        if ( Math.abs( Math.floor( uv.x ) % 2 ) === 1 ) {

                                                uv.x = Math.ceil( uv.x ) - uv.x;

                                        } else {

                                                uv.x = uv.x - Math.floor( uv.x );

                                        }

                                        break;

                        }

                }

                if ( uv.y < 0 || uv.y > 1 ) {

                        switch ( this.wrapT ) {

                                case RepeatWrapping:

                                        uv.y = uv.y - Math.floor( uv.y );
                                        break;

                                case ClampToEdgeWrapping:

                                        uv.y = uv.y < 0 ? 0 : 1;
                                        break;

                                case MirroredRepeatWrapping:

                                        if ( Math.abs( Math.floor( uv.y ) % 2 ) === 1 ) {

                                                uv.y = Math.ceil( uv.y ) - uv.y;

                                        } else {

                                                uv.y = uv.y - Math.floor( uv.y );

                                        }

                                        break;

                        }

                }

                if ( this.flipY ) {

                        uv.y = 1 - uv.y;

                }

                return uv;

        }

} );

Object.defineProperty( Texture.prototype, "needsUpdate", {

        set: function ( value ) {

                if ( value === true ) this.version ++;

        }

} );

function serializeImage( image ) {

        if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||
                ( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||
                ( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ) {

                // default images

                return ImageUtils.getDataURL( image );

        } else {

                if ( image.data ) {

                        // images of DataTexture

                        return {
                                data: Array.prototype.slice.call( image.data ),
                                width: image.width,
                                height: image.height,
                                type: image.data.constructor.name
                        };

                } else {

                        console.warn( 'THREE.Texture: Unable to serialize Texture.' );
                        return {};

                }

        }

}

class Vector4 {

        constructor( x = 0, y = 0, z = 0, w = 1 ) {

                Object.defineProperty( this, 'isVector4', { value: true } );

                this.x = x;
                this.y = y;
                this.z = z;
                this.w = w;

        }

        get width() {

                return this.z;

        }

        set width( value ) {

                this.z = value;

        }

        get height() {

                return this.w;

        }

        set height( value ) {

                this.w = value;

        }

        set( x, y, z, w ) {

                this.x = x;
                this.y = y;
                this.z = z;
                this.w = w;

                return this;

        }

        setScalar( scalar ) {

                this.x = scalar;
                this.y = scalar;
                this.z = scalar;
                this.w = scalar;

                return this;

        }

        setX( x ) {

                this.x = x;

                return this;

        }

        setY( y ) {

                this.y = y;

                return this;

        }

        setZ( z ) {

                this.z = z;

                return this;

        }

        setW( w ) {

                this.w = w;

                return this;

        }

        setComponent( index, value ) {

                switch ( index ) {

                        case 0: this.x = value; break;
                        case 1: this.y = value; break;
                        case 2: this.z = value; break;
                        case 3: this.w = value; break;
                        default: throw new Error( 'index is out of range: ' + index );

                }

                return this;

        }

        getComponent( index ) {

                switch ( index ) {

                        case 0: return this.x;
                        case 1: return this.y;
                        case 2: return this.z;
                        case 3: return this.w;
                        default: throw new Error( 'index is out of range: ' + index );

                }

        }

        clone() {

                return new this.constructor( this.x, this.y, this.z, this.w );

        }

        copy( v ) {

                this.x = v.x;
                this.y = v.y;
                this.z = v.z;
                this.w = ( v.w !== undefined ) ? v.w : 1;

                return this;

        }

        add( v, w ) {

                if ( w !== undefined ) {

                        console.warn( 'THREE.Vector4: .add() now only accepts one argument. Use .addVectors( a, b ) instead.' );
                        return this.addVectors( v, w );

                }

                this.x += v.x;
                this.y += v.y;
                this.z += v.z;
                this.w += v.w;

                return this;

        }

        addScalar( s ) {

                this.x += s;
                this.y += s;
                this.z += s;
                this.w += s;

                return this;

        }

        addVectors( a, b ) {

                this.x = a.x + b.x;
                this.y = a.y + b.y;
                this.z = a.z + b.z;
                this.w = a.w + b.w;

                return this;

        }

        addScaledVector( v, s ) {

                this.x += v.x * s;
                this.y += v.y * s;
                this.z += v.z * s;
                this.w += v.w * s;

                return this;

        }

        sub( v, w ) {

                if ( w !== undefined ) {

                        console.warn( 'THREE.Vector4: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.' );
                        return this.subVectors( v, w );

                }

                this.x -= v.x;
                this.y -= v.y;
                this.z -= v.z;
                this.w -= v.w;

                return this;

        }

        subScalar( s ) {

                this.x -= s;
                this.y -= s;
                this.z -= s;
                this.w -= s;

                return this;

        }

        subVectors( a, b ) {

                this.x = a.x - b.x;
                this.y = a.y - b.y;
                this.z = a.z - b.z;
                this.w = a.w - b.w;

                return this;

        }

        multiplyScalar( scalar ) {

                this.x *= scalar;
                this.y *= scalar;
                this.z *= scalar;
                this.w *= scalar;

                return this;

        }

        applyMatrix4( m ) {

                const x = this.x, y = this.y, z = this.z, w = this.w;
                const e = m.elements;

                this.x = e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z + e[ 12 ] * w;
                this.y = e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z + e[ 13 ] * w;
                this.z = e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z + e[ 14 ] * w;
                this.w = e[ 3 ] * x + e[ 7 ] * y + e[ 11 ] * z + e[ 15 ] * w;

                return this;

        }

        divideScalar( scalar ) {

                return this.multiplyScalar( 1 / scalar );

        }

        setAxisAngleFromQuaternion( q ) {

                // http://www.euclideanspace.com/maths/geometry/rotations/conversions/quaternionToAngle/index.htm

                // q is assumed to be normalized

                this.w = 2 * Math.acos( q.w );

                const s = Math.sqrt( 1 - q.w * q.w );

                if ( s < 0.0001 ) {

                        this.x = 1;
                        this.y = 0;
                        this.z = 0;

                } else {

                        this.x = q.x / s;
                        this.y = q.y / s;
                        this.z = q.z / s;

                }

                return this;

        }

        setAxisAngleFromRotationMatrix( m ) {

                // http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToAngle/index.htm

                // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

                let angle, x, y, z; // variables for result
                const epsilon = 0.01,           // margin to allow for rounding errors
                        epsilon2 = 0.1,         // margin to distinguish between 0 and 180 degrees

                        te = m.elements,

                        m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ],
                        m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ],
                        m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ];

                if ( ( Math.abs( m12 - m21 ) < epsilon ) &&
                     ( Math.abs( m13 - m31 ) < epsilon ) &&
                     ( Math.abs( m23 - m32 ) < epsilon ) ) {

                        // singularity found
                        // first check for identity matrix which must have +1 for all terms
                        // in leading diagonal and zero in other terms

                        if ( ( Math.abs( m12 + m21 ) < epsilon2 ) &&
                             ( Math.abs( m13 + m31 ) < epsilon2 ) &&
                             ( Math.abs( m23 + m32 ) < epsilon2 ) &&
                             ( Math.abs( m11 + m22 + m33 - 3 ) < epsilon2 ) ) {

                                // this singularity is identity matrix so angle = 0

                                this.set( 1, 0, 0, 0 );

                                return this; // zero angle, arbitrary axis

                        }

                        // otherwise this singularity is angle = 180

                        angle = Math.PI;

                        const xx = ( m11 + 1 ) / 2;
                        const yy = ( m22 + 1 ) / 2;
                        const zz = ( m33 + 1 ) / 2;
                        const xy = ( m12 + m21 ) / 4;
                        const xz = ( m13 + m31 ) / 4;
                        const yz = ( m23 + m32 ) / 4;

                        if ( ( xx > yy ) && ( xx > zz ) ) {

                                // m11 is the largest diagonal term

                                if ( xx < epsilon ) {

                                        x = 0;
                                        y = 0.707106781;
                                        z = 0.707106781;

                                } else {

                                        x = Math.sqrt( xx );
                                        y = xy / x;
                                        z = xz / x;

                                }

                        } else if ( yy > zz ) {

                                // m22 is the largest diagonal term

                                if ( yy < epsilon ) {

                                        x = 0.707106781;
                                        y = 0;
                                        z = 0.707106781;

                                } else {

                                        y = Math.sqrt( yy );
                                        x = xy / y;
                                        z = yz / y;

                                }

                        } else {

                                // m33 is the largest diagonal term so base result on this

                                if ( zz < epsilon ) {

                                        x = 0.707106781;
                                        y = 0.707106781;
                                        z = 0;

                                } else {

                                        z = Math.sqrt( zz );
                                        x = xz / z;
                                        y = yz / z;

                                }

                        }

                        this.set( x, y, z, angle );

                        return this; // return 180 deg rotation

                }

                // as we have reached here there are no singularities so we can handle normally

                let s = Math.sqrt( ( m32 - m23 ) * ( m32 - m23 ) +
                        ( m13 - m31 ) * ( m13 - m31 ) +
                        ( m21 - m12 ) * ( m21 - m12 ) ); // used to normalize

                if ( Math.abs( s ) < 0.001 ) s = 1;

                // prevent divide by zero, should not happen if matrix is orthogonal and should be
                // caught by singularity test above, but I've left it in just in case

                this.x = ( m32 - m23 ) / s;
                this.y = ( m13 - m31 ) / s;
                this.z = ( m21 - m12 ) / s;
                this.w = Math.acos( ( m11 + m22 + m33 - 1 ) / 2 );

                return this;

        }

        min( v ) {

                this.x = Math.min( this.x, v.x );
                this.y = Math.min( this.y, v.y );
                this.z = Math.min( this.z, v.z );
                this.w = Math.min( this.w, v.w );

                return this;

        }

        max( v ) {

                this.x = Math.max( this.x, v.x );
                this.y = Math.max( this.y, v.y );
                this.z = Math.max( this.z, v.z );
                this.w = Math.max( this.w, v.w );

                return this;

        }

        clamp( min, max ) {

                // assumes min < max, componentwise

                this.x = Math.max( min.x, Math.min( max.x, this.x ) );
                this.y = Math.max( min.y, Math.min( max.y, this.y ) );
                this.z = Math.max( min.z, Math.min( max.z, this.z ) );
                this.w = Math.max( min.w, Math.min( max.w, this.w ) );

                return this;

        }

        clampScalar( minVal, maxVal ) {

                this.x = Math.max( minVal, Math.min( maxVal, this.x ) );
                this.y = Math.max( minVal, Math.min( maxVal, this.y ) );
                this.z = Math.max( minVal, Math.min( maxVal, this.z ) );
                this.w = Math.max( minVal, Math.min( maxVal, this.w ) );

                return this;

        }

        clampLength( min, max ) {

                const length = this.length();

                return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );

        }

        floor() {

                this.x = Math.floor( this.x );
                this.y = Math.floor( this.y );
                this.z = Math.floor( this.z );
                this.w = Math.floor( this.w );

                return this;

        }

        ceil() {

                this.x = Math.ceil( this.x );
                this.y = Math.ceil( this.y );
                this.z = Math.ceil( this.z );
                this.w = Math.ceil( this.w );

                return this;

        }

        round() {

                this.x = Math.round( this.x );
                this.y = Math.round( this.y );
                this.z = Math.round( this.z );
                this.w = Math.round( this.w );

                return this;

        }

        roundToZero() {

                this.x = ( this.x < 0 ) ? Math.ceil( this.x ) : Math.floor( this.x );
                this.y = ( this.y < 0 ) ? Math.ceil( this.y ) : Math.floor( this.y );
                this.z = ( this.z < 0 ) ? Math.ceil( this.z ) : Math.floor( this.z );
                this.w = ( this.w < 0 ) ? Math.ceil( this.w ) : Math.floor( this.w );

                return this;

        }

        negate() {

                this.x = - this.x;
                this.y = - this.y;
                this.z = - this.z;
                this.w = - this.w;

                return this;

        }

        dot( v ) {

                return this.x * v.x + this.y * v.y + this.z * v.z + this.w * v.w;

        }

        lengthSq() {

                return this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w;

        }

        length() {

                return Math.sqrt( this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w );

        }

        manhattanLength() {

                return Math.abs( this.x ) + Math.abs( this.y ) + Math.abs( this.z ) + Math.abs( this.w );

        }

        normalize() {

                return this.divideScalar( this.length() || 1 );

        }

        setLength( length ) {

                return this.normalize().multiplyScalar( length );

        }

        lerp( v, alpha ) {

                this.x += ( v.x - this.x ) * alpha;
                this.y += ( v.y - this.y ) * alpha;
                this.z += ( v.z - this.z ) * alpha;
                this.w += ( v.w - this.w ) * alpha;

                return this;

        }

        lerpVectors( v1, v2, alpha ) {

                this.x = v1.x + ( v2.x - v1.x ) * alpha;
                this.y = v1.y + ( v2.y - v1.y ) * alpha;
                this.z = v1.z + ( v2.z - v1.z ) * alpha;
                this.w = v1.w + ( v2.w - v1.w ) * alpha;

                return this;

        }

        equals( v ) {

                return ( ( v.x === this.x ) && ( v.y === this.y ) && ( v.z === this.z ) && ( v.w === this.w ) );

        }

        fromArray( array, offset = 0 ) {

                this.x = array[ offset ];
                this.y = array[ offset + 1 ];
                this.z = array[ offset + 2 ];
                this.w = array[ offset + 3 ];

                return this;

        }

        toArray( array = [], offset = 0 ) {

                array[ offset ] = this.x;
                array[ offset + 1 ] = this.y;
                array[ offset + 2 ] = this.z;
                array[ offset + 3 ] = this.w;

                return array;

        }

        fromBufferAttribute( attribute, index, offset ) {

                if ( offset !== undefined ) {

                        console.warn( 'THREE.Vector4: offset has been removed from .fromBufferAttribute().' );

                }

                this.x = attribute.getX( index );
                this.y = attribute.getY( index );
                this.z = attribute.getZ( index );
                this.w = attribute.getW( index );

                return this;

        }

        random() {

                this.x = Math.random();
                this.y = Math.random();
                this.z = Math.random();
                this.w = Math.random();

                return this;

        }

}

/*
 In options, we can specify:
 * Texture parameters for an auto-generated target texture
 * depthBuffer/stencilBuffer: Booleans to indicate if we should generate these buffers
*/
function WebGLRenderTarget( width, height, options ) {

        this.width = width;
        this.height = height;

        this.scissor = new Vector4( 0, 0, width, height );
        this.scissorTest = false;

        this.viewport = new Vector4( 0, 0, width, height );

        options = options || {};

        this.texture = new Texture( undefined, options.mapping, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.encoding );

        this.texture.image = {};
        this.texture.image.width = width;
        this.texture.image.height = height;

        this.texture.generateMipmaps = options.generateMipmaps !== undefined ? options.generateMipmaps : false;
        this.texture.minFilter = options.minFilter !== undefined ? options.minFilter : LinearFilter;

        this.depthBuffer = options.depthBuffer !== undefined ? options.depthBuffer : true;
        this.stencilBuffer = options.stencilBuffer !== undefined ? options.stencilBuffer : false;
        this.depthTexture = options.depthTexture !== undefined ? options.depthTexture : null;

}

WebGLRenderTarget.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

        constructor: WebGLRenderTarget,

        isWebGLRenderTarget: true,

        setSize: function ( width, height ) {

                if ( this.width !== width || this.height !== height ) {

                        this.width = width;
                        this.height = height;

                        this.texture.image.width = width;
                        this.texture.image.height = height;

                        this.dispose();

                }

                this.viewport.set( 0, 0, width, height );
                this.scissor.set( 0, 0, width, height );

        },

        clone: function () {

                return new this.constructor().copy( this );

        },

        copy: function ( source ) {

                this.width = source.width;
                this.height = source.height;

                this.viewport.copy( source.viewport );

                this.texture = source.texture.clone();

                this.depthBuffer = source.depthBuffer;
                this.stencilBuffer = source.stencilBuffer;
                this.depthTexture = source.depthTexture;

                return this;

        },

        dispose: function () {

                this.dispatchEvent( { type: 'dispose' } );

        }

} );

function WebGLMultisampleRenderTarget( width, height, options ) {

        WebGLRenderTarget.call( this, width, height, options );

        this.samples = 4;

}

WebGLMultisampleRenderTarget.prototype = Object.assign( Object.create( WebGLRenderTarget.prototype ), {

        constructor: WebGLMultisampleRenderTarget,

        isWebGLMultisampleRenderTarget: true,

        copy: function ( source ) {

                WebGLRenderTarget.prototype.copy.call( this, source );

                this.samples = source.samples;

                return this;

        }

} );

class Quaternion {

        constructor( x = 0, y = 0, z = 0, w = 1 ) {

                Object.defineProperty( this, 'isQuaternion', { value: true } );

                this._x = x;
                this._y = y;
                this._z = z;
                this._w = w;

        }

        static slerp( qa, qb, qm, t ) {

                return qm.copy( qa ).slerp( qb, t );

        }

        static slerpFlat( dst, dstOffset, src0, srcOffset0, src1, srcOffset1, t ) {

                // fuzz-free, array-based Quaternion SLERP operation

                let x0 = src0[ srcOffset0 + 0 ],
                        y0 = src0[ srcOffset0 + 1 ],
                        z0 = src0[ srcOffset0 + 2 ],
                        w0 = src0[ srcOffset0 + 3 ];

                const x1 = src1[ srcOffset1 + 0 ],
                        y1 = src1[ srcOffset1 + 1 ],
                        z1 = src1[ srcOffset1 + 2 ],
                        w1 = src1[ srcOffset1 + 3 ];

                if ( w0 !== w1 || x0 !== x1 || y0 !== y1 || z0 !== z1 ) {

                        let s = 1 - t;
                        const cos = x0 * x1 + y0 * y1 + z0 * z1 + w0 * w1,
                                dir = ( cos >= 0 ? 1 : - 1 ),
                                sqrSin = 1 - cos * cos;

                        // Skip the Slerp for tiny steps to avoid numeric problems:
                        if ( sqrSin > Number.EPSILON ) {

                                const sin = Math.sqrt( sqrSin ),
                                        len = Math.atan2( sin, cos * dir );

                                s = Math.sin( s * len ) / sin;
                                t = Math.sin( t * len ) / sin;

                        }

                        const tDir = t * dir;

                        x0 = x0 * s + x1 * tDir;
                        y0 = y0 * s + y1 * tDir;
                        z0 = z0 * s + z1 * tDir;
                        w0 = w0 * s + w1 * tDir;

                        // Normalize in case we just did a lerp:
                        if ( s === 1 - t ) {

                                const f = 1 / Math.sqrt( x0 * x0 + y0 * y0 + z0 * z0 + w0 * w0 );

                                x0 *= f;
                                y0 *= f;
                                z0 *= f;
                                w0 *= f;

                        }

                }

                dst[ dstOffset ] = x0;
                dst[ dstOffset + 1 ] = y0;
                dst[ dstOffset + 2 ] = z0;
                dst[ dstOffset + 3 ] = w0;

        }

        static multiplyQuaternionsFlat( dst, dstOffset, src0, srcOffset0, src1, srcOffset1 ) {

                const x0 = src0[ srcOffset0 ];
                const y0 = src0[ srcOffset0 + 1 ];
                const z0 = src0[ srcOffset0 + 2 ];
                const w0 = src0[ srcOffset0 + 3 ];

                const x1 = src1[ srcOffset1 ];
                const y1 = src1[ srcOffset1 + 1 ];
                const z1 = src1[ srcOffset1 + 2 ];
                const w1 = src1[ srcOffset1 + 3 ];

                dst[ dstOffset ] = x0 * w1 + w0 * x1 + y0 * z1 - z0 * y1;
                dst[ dstOffset + 1 ] = y0 * w1 + w0 * y1 + z0 * x1 - x0 * z1;
                dst[ dstOffset + 2 ] = z0 * w1 + w0 * z1 + x0 * y1 - y0 * x1;
                dst[ dstOffset + 3 ] = w0 * w1 - x0 * x1 - y0 * y1 - z0 * z1;

                return dst;

        }

        get x() {

                return this._x;

        }

        set x( value ) {

                this._x = value;
                this._onChangeCallback();

        }

        get y() {

                return this._y;

        }

        set y( value ) {

                this._y = value;
                this._onChangeCallback();

        }

        get z() {

                return this._z;

        }

        set z( value ) {

                this._z = value;
                this._onChangeCallback();

        }

        get w() {

                return this._w;

        }

        set w( value ) {

                this._w = value;
                this._onChangeCallback();

        }

        set( x, y, z, w ) {

                this._x = x;
                this._y = y;
                this._z = z;
                this._w = w;

                this._onChangeCallback();

                return this;

        }

        clone() {

                return new this.constructor( this._x, this._y, this._z, this._w );

        }

        copy( quaternion ) {

                this._x = quaternion.x;
                this._y = quaternion.y;
                this._z = quaternion.z;
                this._w = quaternion.w;

                this._onChangeCallback();

                return this;

        }

        setFromEuler( euler, update ) {

                if ( ! ( euler && euler.isEuler ) ) {

                        throw new Error( 'THREE.Quaternion: .setFromEuler() now expects an Euler rotation rather than a Vector3 and order.' );

                }

                const x = euler._x, y = euler._y, z = euler._z, order = euler._order;

                // http://www.mathworks.com/matlabcentral/fileexchange/
                //      20696-function-to-convert-between-dcm-euler-angles-quaternions-and-euler-vectors/
                //      content/SpinCalc.m

                const cos = Math.cos;
                const sin = Math.sin;

                const c1 = cos( x / 2 );
                const c2 = cos( y / 2 );
                const c3 = cos( z / 2 );

                const s1 = sin( x / 2 );
                const s2 = sin( y / 2 );
                const s3 = sin( z / 2 );

                switch ( order ) {

                        case 'XYZ':
                                this._x = s1 * c2 * c3 + c1 * s2 * s3;
                                this._y = c1 * s2 * c3 - s1 * c2 * s3;
                                this._z = c1 * c2 * s3 + s1 * s2 * c3;
                                this._w = c1 * c2 * c3 - s1 * s2 * s3;
                                break;

                        case 'YXZ':
                                this._x = s1 * c2 * c3 + c1 * s2 * s3;
                                this._y = c1 * s2 * c3 - s1 * c2 * s3;
                                this._z = c1 * c2 * s3 - s1 * s2 * c3;
                                this._w = c1 * c2 * c3 + s1 * s2 * s3;
                                break;

                        case 'ZXY':
                                this._x = s1 * c2 * c3 - c1 * s2 * s3;
                                this._y = c1 * s2 * c3 + s1 * c2 * s3;
                                this._z = c1 * c2 * s3 + s1 * s2 * c3;
                                this._w = c1 * c2 * c3 - s1 * s2 * s3;
                                break;

                        case 'ZYX':
                                this._x = s1 * c2 * c3 - c1 * s2 * s3;
                                this._y = c1 * s2 * c3 + s1 * c2 * s3;
                                this._z = c1 * c2 * s3 - s1 * s2 * c3;
                                this._w = c1 * c2 * c3 + s1 * s2 * s3;
                                break;

                        case 'YZX':
                                this._x = s1 * c2 * c3 + c1 * s2 * s3;
                                this._y = c1 * s2 * c3 + s1 * c2 * s3;
                                this._z = c1 * c2 * s3 - s1 * s2 * c3;
                                this._w = c1 * c2 * c3 - s1 * s2 * s3;
                                break;

                        case 'XZY':
                                this._x = s1 * c2 * c3 - c1 * s2 * s3;
                                this._y = c1 * s2 * c3 - s1 * c2 * s3;
                                this._z = c1 * c2 * s3 + s1 * s2 * c3;
                                this._w = c1 * c2 * c3 + s1 * s2 * s3;
                                break;

                        default:
                                console.warn( 'THREE.Quaternion: .setFromEuler() encountered an unknown order: ' + order );

                }

                if ( update !== false ) this._onChangeCallback();

                return this;

        }

        setFromAxisAngle( axis, angle ) {

                // http://www.euclideanspace.com/maths/geometry/rotations/conversions/angleToQuaternion/index.htm

                // assumes axis is normalized

                const halfAngle = angle / 2, s = Math.sin( halfAngle );

                this._x = axis.x * s;
                this._y = axis.y * s;
                this._z = axis.z * s;
                this._w = Math.cos( halfAngle );

                this._onChangeCallback();

                return this;

        }

        setFromRotationMatrix( m ) {

                // http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/index.htm

                // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

                const te = m.elements,

                        m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ],
                        m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ],
                        m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ],

                        trace = m11 + m22 + m33;

                if ( trace > 0 ) {

                        const s = 0.5 / Math.sqrt( trace + 1.0 );

                        this._w = 0.25 / s;
                        this._x = ( m32 - m23 ) * s;
                        this._y = ( m13 - m31 ) * s;
                        this._z = ( m21 - m12 ) * s;

                } else if ( m11 > m22 && m11 > m33 ) {

                        const s = 2.0 * Math.sqrt( 1.0 + m11 - m22 - m33 );

                        this._w = ( m32 - m23 ) / s;
                        this._x = 0.25 * s;
                        this._y = ( m12 + m21 ) / s;
                        this._z = ( m13 + m31 ) / s;

                } else if ( m22 > m33 ) {

                        const s = 2.0 * Math.sqrt( 1.0 + m22 - m11 - m33 );

                        this._w = ( m13 - m31 ) / s;
                        this._x = ( m12 + m21 ) / s;
                        this._y = 0.25 * s;
                        this._z = ( m23 + m32 ) / s;

                } else {

                        const s = 2.0 * Math.sqrt( 1.0 + m33 - m11 - m22 );

                        this._w = ( m21 - m12 ) / s;
                        this._x = ( m13 + m31 ) / s;
                        this._y = ( m23 + m32 ) / s;
                        this._z = 0.25 * s;

                }

                this._onChangeCallback();

                return this;

        }

        setFromUnitVectors( vFrom, vTo ) {

                // assumes direction vectors vFrom and vTo are normalized

                const EPS = 0.000001;

                let r = vFrom.dot( vTo ) + 1;

                if ( r < EPS ) {

                        r = 0;

                        if ( Math.abs( vFrom.x ) > Math.abs( vFrom.z ) ) {

                                this._x = - vFrom.y;
                                this._y = vFrom.x;
                                this._z = 0;
                                this._w = r;

                        } else {

                                this._x = 0;
                                this._y = - vFrom.z;
                                this._z = vFrom.y;
                                this._w = r;

                        }

                } else {

                        // crossVectors( vFrom, vTo ); // inlined to avoid cyclic dependency on Vector3

                        this._x = vFrom.y * vTo.z - vFrom.z * vTo.y;
                        this._y = vFrom.z * vTo.x - vFrom.x * vTo.z;
                        this._z = vFrom.x * vTo.y - vFrom.y * vTo.x;
                        this._w = r;

                }

                return this.normalize();

        }

        angleTo( q ) {

                return 2 * Math.acos( Math.abs( MathUtils.clamp( this.dot( q ), - 1, 1 ) ) );

        }

        rotateTowards( q, step ) {

                const angle = this.angleTo( q );

                if ( angle === 0 ) return this;

                const t = Math.min( 1, step / angle );

                this.slerp( q, t );

                return this;

        }

        identity() {

                return this.set( 0, 0, 0, 1 );

        }

        invert() {

                // quaternion is assumed to have unit length

                return this.conjugate();

        }

        conjugate() {

                this._x *= - 1;
                this._y *= - 1;
                this._z *= - 1;

                this._onChangeCallback();

                return this;

        }

        dot( v ) {

                return this._x * v._x + this._y * v._y + this._z * v._z + this._w * v._w;

        }

        lengthSq() {

                return this._x * this._x + this._y * this._y + this._z * this._z + this._w * this._w;

        }

        length() {

                return Math.sqrt( this._x * this._x + this._y * this._y + this._z * this._z + this._w * this._w );

        }

        normalize() {

                let l = this.length();

                if ( l === 0 ) {

                        this._x = 0;
                        this._y = 0;
                        this._z = 0;
                        this._w = 1;

                } else {

                        l = 1 / l;

                        this._x = this._x * l;
                        this._y = this._y * l;
                        this._z = this._z * l;
                        this._w = this._w * l;

                }

                this._onChangeCallback();

                return this;

        }

        multiply( q, p ) {

                if ( p !== undefined ) {

                        console.warn( 'THREE.Quaternion: .multiply() now only accepts one argument. Use .multiplyQuaternions( a, b ) instead.' );
                        return this.multiplyQuaternions( q, p );

                }

                return this.multiplyQuaternions( this, q );

        }

        premultiply( q ) {

                return this.multiplyQuaternions( q, this );

        }

        multiplyQuaternions( a, b ) {

                // from http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/code/index.htm

                const qax = a._x, qay = a._y, qaz = a._z, qaw = a._w;
                const qbx = b._x, qby = b._y, qbz = b._z, qbw = b._w;

                this._x = qax * qbw + qaw * qbx + qay * qbz - qaz * qby;
                this._y = qay * qbw + qaw * qby + qaz * qbx - qax * qbz;
                this._z = qaz * qbw + qaw * qbz + qax * qby - qay * qbx;
                this._w = qaw * qbw - qax * qbx - qay * qby - qaz * qbz;

                this._onChangeCallback();

                return this;

        }

        slerp( qb, t ) {

                if ( t === 0 ) return this;
                if ( t === 1 ) return this.copy( qb );

                const x = this._x, y = this._y, z = this._z, w = this._w;

                // http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/slerp/

                let cosHalfTheta = w * qb._w + x * qb._x + y * qb._y + z * qb._z;

                if ( cosHalfTheta < 0 ) {

                        this._w = - qb._w;
                        this._x = - qb._x;
                        this._y = - qb._y;
                        this._z = - qb._z;

                        cosHalfTheta = - cosHalfTheta;

                } else {

                        this.copy( qb );

                }

                if ( cosHalfTheta >= 1.0 ) {

                        this._w = w;
                        this._x = x;
                        this._y = y;
                        this._z = z;

                        return this;

                }

                const sqrSinHalfTheta = 1.0 - cosHalfTheta * cosHalfTheta;

                if ( sqrSinHalfTheta <= Number.EPSILON ) {

                        const s = 1 - t;
                        this._w = s * w + t * this._w;
                        this._x = s * x + t * this._x;
                        this._y = s * y + t * this._y;
                        this._z = s * z + t * this._z;

                        this.normalize();
                        this._onChangeCallback();

                        return this;

                }

                const sinHalfTheta = Math.sqrt( sqrSinHalfTheta );
                const halfTheta = Math.atan2( sinHalfTheta, cosHalfTheta );
                const ratioA = Math.sin( ( 1 - t ) * halfTheta ) / sinHalfTheta,
                        ratioB = Math.sin( t * halfTheta ) / sinHalfTheta;

                this._w = ( w * ratioA + this._w * ratioB );
                this._x = ( x * ratioA + this._x * ratioB );
                this._y = ( y * ratioA + this._y * ratioB );
                this._z = ( z * ratioA + this._z * ratioB );

                this._onChangeCallback();

                return this;

        }

        equals( quaternion ) {

                return ( quaternion._x === this._x ) && ( quaternion._y === this._y ) && ( quaternion._z === this._z ) && ( quaternion._w === this._w );

        }

        fromArray( array, offset = 0 ) {

                this._x = array[ offset ];
                this._y = array[ offset + 1 ];
                this._z = array[ offset + 2 ];
                this._w = array[ offset + 3 ];

                this._onChangeCallback();

                return this;

        }

        toArray( array = [], offset = 0 ) {

                array[ offset ] = this._x;
                array[ offset + 1 ] = this._y;
                array[ offset + 2 ] = this._z;
                array[ offset + 3 ] = this._w;

                return array;

        }

        fromBufferAttribute( attribute, index ) {

                this._x = attribute.getX( index );
                this._y = attribute.getY( index );
                this._z = attribute.getZ( index );
                this._w = attribute.getW( index );

                return this;

        }

        _onChange( callback ) {

                this._onChangeCallback = callback;

                return this;

        }

        _onChangeCallback() {}

}

class Vector3 {

        constructor( x = 0, y = 0, z = 0 ) {

                Object.defineProperty( this, 'isVector3', { value: true } );

                this.x = x;
                this.y = y;
                this.z = z;

        }

        set( x, y, z ) {

                if ( z === undefined ) z = this.z; // sprite.scale.set(x,y)

                this.x = x;
                this.y = y;
                this.z = z;

                return this;

        }

        setScalar( scalar ) {

                this.x = scalar;
                this.y = scalar;
                this.z = scalar;

                return this;

        }

        setX( x ) {

                this.x = x;

                return this;

        }

        setY( y ) {

                this.y = y;

                return this;

        }

        setZ( z ) {

                this.z = z;

                return this;

        }

        setComponent( index, value ) {

                switch ( index ) {

                        case 0: this.x = value; break;
                        case 1: this.y = value; break;
                        case 2: this.z = value; break;
                        default: throw new Error( 'index is out of range: ' + index );

                }

                return this;

        }

        getComponent( index ) {

                switch ( index ) {

                        case 0: return this.x;
                        case 1: return this.y;
                        case 2: return this.z;
                        default: throw new Error( 'index is out of range: ' + index );

                }

        }

        clone() {

                return new this.constructor( this.x, this.y, this.z );

        }

        copy( v ) {

                this.x = v.x;
                this.y = v.y;
                this.z = v.z;

                return this;

        }

        add( v, w ) {

                if ( w !== undefined ) {

                        console.warn( 'THREE.Vector3: .add() now only accepts one argument. Use .addVectors( a, b ) instead.' );
                        return this.addVectors( v, w );

                }

                this.x += v.x;
                this.y += v.y;
                this.z += v.z;

                return this;

        }

        addScalar( s ) {

                this.x += s;
                this.y += s;
                this.z += s;

                return this;

        }

        addVectors( a, b ) {

                this.x = a.x + b.x;
                this.y = a.y + b.y;
                this.z = a.z + b.z;

                return this;

        }

        addScaledVector( v, s ) {

                this.x += v.x * s;
                this.y += v.y * s;
                this.z += v.z * s;

                return this;

        }

        sub( v, w ) {

                if ( w !== undefined ) {

                        console.warn( 'THREE.Vector3: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.' );
                        return this.subVectors( v, w );

                }

                this.x -= v.x;
                this.y -= v.y;
                this.z -= v.z;

                return this;

        }

        subScalar( s ) {

                this.x -= s;
                this.y -= s;
                this.z -= s;

                return this;

        }

        subVectors( a, b ) {

                this.x = a.x - b.x;
                this.y = a.y - b.y;
                this.z = a.z - b.z;

                return this;

        }

        multiply( v, w ) {

                if ( w !== undefined ) {

                        console.warn( 'THREE.Vector3: .multiply() now only accepts one argument. Use .multiplyVectors( a, b ) instead.' );
                        return this.multiplyVectors( v, w );

                }

                this.x *= v.x;
                this.y *= v.y;
                this.z *= v.z;

                return this;

        }

        multiplyScalar( scalar ) {

                this.x *= scalar;
                this.y *= scalar;
                this.z *= scalar;

                return this;

        }

        multiplyVectors( a, b ) {

                this.x = a.x * b.x;
                this.y = a.y * b.y;
                this.z = a.z * b.z;

                return this;

        }

        applyEuler( euler ) {

                if ( ! ( euler && euler.isEuler ) ) {

                        console.error( 'THREE.Vector3: .applyEuler() now expects an Euler rotation rather than a Vector3 and order.' );

                }

                return this.applyQuaternion( _quaternion.setFromEuler( euler ) );

        }

        applyAxisAngle( axis, angle ) {

                return this.applyQuaternion( _quaternion.setFromAxisAngle( axis, angle ) );

        }

        applyMatrix3( m ) {

                const x = this.x, y = this.y, z = this.z;
                const e = m.elements;

                this.x = e[ 0 ] * x + e[ 3 ] * y + e[ 6 ] * z;
                this.y = e[ 1 ] * x + e[ 4 ] * y + e[ 7 ] * z;
                this.z = e[ 2 ] * x + e[ 5 ] * y + e[ 8 ] * z;

                return this;

        }

        applyNormalMatrix( m ) {

                return this.applyMatrix3( m ).normalize();

        }

        applyMatrix4( m ) {

                const x = this.x, y = this.y, z = this.z;
                const e = m.elements;

                const w = 1 / ( e[ 3 ] * x + e[ 7 ] * y + e[ 11 ] * z + e[ 15 ] );

                this.x = ( e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z + e[ 12 ] ) * w;
                this.y = ( e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z + e[ 13 ] ) * w;
                this.z = ( e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z + e[ 14 ] ) * w;

                return this;

        }

        applyQuaternion( q ) {

                const x = this.x, y = this.y, z = this.z;
                const qx = q.x, qy = q.y, qz = q.z, qw = q.w;

                // calculate quat * vector

                const ix = qw * x + qy * z - qz * y;
                const iy = qw * y + qz * x - qx * z;
                const iz = qw * z + qx * y - qy * x;
                const iw = - qx * x - qy * y - qz * z;

                // calculate result * inverse quat

                this.x = ix * qw + iw * - qx + iy * - qz - iz * - qy;
                this.y = iy * qw + iw * - qy + iz * - qx - ix * - qz;
                this.z = iz * qw + iw * - qz + ix * - qy - iy * - qx;

                return this;

        }

        project( camera ) {

                return this.applyMatrix4( camera.matrixWorldInverse ).applyMatrix4( camera.projectionMatrix );

        }

        unproject( camera ) {

                return this.applyMatrix4( camera.projectionMatrixInverse ).applyMatrix4( camera.matrixWorld );

        }

        transformDirection( m ) {

                // input: THREE.Matrix4 affine matrix
                // vector interpreted as a direction

                const x = this.x, y = this.y, z = this.z;
                const e = m.elements;

                this.x = e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z;
                this.y = e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z;
                this.z = e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z;

                return this.normalize();

        }

        divide( v ) {

                this.x /= v.x;
                this.y /= v.y;
                this.z /= v.z;

                return this;

        }

        divideScalar( scalar ) {

                return this.multiplyScalar( 1 / scalar );

        }

        min( v ) {

                this.x = Math.min( this.x, v.x );
                this.y = Math.min( this.y, v.y );
                this.z = Math.min( this.z, v.z );

                return this;

        }

        max( v ) {

                this.x = Math.max( this.x, v.x );
                this.y = Math.max( this.y, v.y );
                this.z = Math.max( this.z, v.z );

                return this;

        }

        clamp( min, max ) {

                // assumes min < max, componentwise

                this.x = Math.max( min.x, Math.min( max.x, this.x ) );
                this.y = Math.max( min.y, Math.min( max.y, this.y ) );
                this.z = Math.max( min.z, Math.min( max.z, this.z ) );

                return this;

        }

        clampScalar( minVal, maxVal ) {

                this.x = Math.max( minVal, Math.min( maxVal, this.x ) );
                this.y = Math.max( minVal, Math.min( maxVal, this.y ) );
                this.z = Math.max( minVal, Math.min( maxVal, this.z ) );

                return this;

        }

        clampLength( min, max ) {

                const length = this.length();

                return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );

        }

        floor() {

                this.x = Math.floor( this.x );
                this.y = Math.floor( this.y );
                this.z = Math.floor( this.z );

                return this;

        }

        ceil() {

                this.x = Math.ceil( this.x );
                this.y = Math.ceil( this.y );
                this.z = Math.ceil( this.z );

                return this;

        }

        round() {

                this.x = Math.round( this.x );
                this.y = Math.round( this.y );
                this.z = Math.round( this.z );

                return this;

        }

        roundToZero() {

                this.x = ( this.x < 0 ) ? Math.ceil( this.x ) : Math.floor( this.x );
                this.y = ( this.y < 0 ) ? Math.ceil( this.y ) : Math.floor( this.y );
                this.z = ( this.z < 0 ) ? Math.ceil( this.z ) : Math.floor( this.z );

                return this;

        }

        negate() {

                this.x = - this.x;
                this.y = - this.y;
                this.z = - this.z;

                return this;

        }

        dot( v ) {

                return this.x * v.x + this.y * v.y + this.z * v.z;

        }

        // TODO lengthSquared?

        lengthSq() {

                return this.x * this.x + this.y * this.y + this.z * this.z;

        }

        length() {

                return Math.sqrt( this.x * this.x + this.y * this.y + this.z * this.z );

        }

        manhattanLength() {

                return Math.abs( this.x ) + Math.abs( this.y ) + Math.abs( this.z );

        }

        normalize() {

                return this.divideScalar( this.length() || 1 );

        }

        setLength( length ) {

                return this.normalize().multiplyScalar( length );

        }

        lerp( v, alpha ) {

                this.x += ( v.x - this.x ) * alpha;
                this.y += ( v.y - this.y ) * alpha;
                this.z += ( v.z - this.z ) * alpha;

                return this;

        }

        lerpVectors( v1, v2, alpha ) {

                this.x = v1.x + ( v2.x - v1.x ) * alpha;
                this.y = v1.y + ( v2.y - v1.y ) * alpha;
                this.z = v1.z + ( v2.z - v1.z ) * alpha;

                return this;

        }

        cross( v, w ) {

                if ( w !== undefined ) {

                        console.warn( 'THREE.Vector3: .cross() now only accepts one argument. Use .crossVectors( a, b ) instead.' );
                        return this.crossVectors( v, w );

                }

                return this.crossVectors( this, v );

        }

        crossVectors( a, b ) {

                const ax = a.x, ay = a.y, az = a.z;
                const bx = b.x, by = b.y, bz = b.z;

                this.x = ay * bz - az * by;
                this.y = az * bx - ax * bz;
                this.z = ax * by - ay * bx;

                return this;

        }

        projectOnVector( v ) {

                const denominator = v.lengthSq();

                if ( denominator === 0 ) return this.set( 0, 0, 0 );

                const scalar = v.dot( this ) / denominator;

                return this.copy( v ).multiplyScalar( scalar );

        }

        projectOnPlane( planeNormal ) {

                _vector.copy( this ).projectOnVector( planeNormal );

                return this.sub( _vector );

        }

        reflect( normal ) {

                // reflect incident vector off plane orthogonal to normal
                // normal is assumed to have unit length

                return this.sub( _vector.copy( normal ).multiplyScalar( 2 * this.dot( normal ) ) );

        }

        angleTo( v ) {

                const denominator = Math.sqrt( this.lengthSq() * v.lengthSq() );

                if ( denominator === 0 ) return Math.PI / 2;

                const theta = this.dot( v ) / denominator;

                // clamp, to handle numerical problems

                return Math.acos( MathUtils.clamp( theta, - 1, 1 ) );

        }

        distanceTo( v ) {

                return Math.sqrt( this.distanceToSquared( v ) );

        }

        distanceToSquared( v ) {

                const dx = this.x - v.x, dy = this.y - v.y, dz = this.z - v.z;

                return dx * dx + dy * dy + dz * dz;

        }

        manhattanDistanceTo( v ) {

                return Math.abs( this.x - v.x ) + Math.abs( this.y - v.y ) + Math.abs( this.z - v.z );

        }

        setFromSpherical( s ) {

                return this.setFromSphericalCoords( s.radius, s.phi, s.theta );

        }

        setFromSphericalCoords( radius, phi, theta ) {

                const sinPhiRadius = Math.sin( phi ) * radius;

                this.x = sinPhiRadius * Math.sin( theta );
                this.y = Math.cos( phi ) * radius;
                this.z = sinPhiRadius * Math.cos( theta );

                return this;

        }

        setFromCylindrical( c ) {

                return this.setFromCylindricalCoords( c.radius, c.theta, c.y );

        }

        setFromCylindricalCoords( radius, theta, y ) {

                this.x = radius * Math.sin( theta );
                this.y = y;
                this.z = radius * Math.cos( theta );

                return this;

        }

        setFromMatrixPosition( m ) {

                const e = m.elements;

                this.x = e[ 12 ];
                this.y = e[ 13 ];
                this.z = e[ 14 ];

                return this;

        }

        setFromMatrixScale( m ) {

                const sx = this.setFromMatrixColumn( m, 0 ).length();
                const sy = this.setFromMatrixColumn( m, 1 ).length();
                const sz = this.setFromMatrixColumn( m, 2 ).length();

                this.x = sx;
                this.y = sy;
                this.z = sz;

                return this;

        }

        setFromMatrixColumn( m, index ) {

                return this.fromArray( m.elements, index * 4 );

        }

        setFromMatrix3Column( m, index ) {

                return this.fromArray( m.elements, index * 3 );

        }

        equals( v ) {

                return ( ( v.x === this.x ) && ( v.y === this.y ) && ( v.z === this.z ) );

        }

        fromArray( array, offset = 0 ) {

                this.x = array[ offset ];
                this.y = array[ offset + 1 ];
                this.z = array[ offset + 2 ];

                return this;

        }

        toArray( array = [], offset = 0 ) {

                array[ offset ] = this.x;
                array[ offset + 1 ] = this.y;
                array[ offset + 2 ] = this.z;

                return array;

        }

        fromBufferAttribute( attribute, index, offset ) {

                if ( offset !== undefined ) {

                        console.warn( 'THREE.Vector3: offset has been removed from .fromBufferAttribute().' );

                }

                this.x = attribute.getX( index );
                this.y = attribute.getY( index );
                this.z = attribute.getZ( index );

                return this;

        }

        random() {

                this.x = Math.random();
                this.y = Math.random();
                this.z = Math.random();

                return this;

        }

}

const _vector = /*@__PURE__*/ new Vector3();
const _quaternion = /*@__PURE__*/ new Quaternion();

class Box3 {

        constructor( min, max ) {

                Object.defineProperty( this, 'isBox3', { value: true } );

                this.min = ( min !== undefined ) ? min : new Vector3( + Infinity, + Infinity, + Infinity );
                this.max = ( max !== undefined ) ? max : new Vector3( - Infinity, - Infinity, - Infinity );

        }

        set( min, max ) {

                this.min.copy( min );
                this.max.copy( max );

                return this;

        }

        setFromArray( array ) {

                let minX = + Infinity;
                let minY = + Infinity;
                let minZ = + Infinity;

                let maxX = - Infinity;
                let maxY = - Infinity;
                let maxZ = - Infinity;

                for ( let i = 0, l = array.length; i < l; i += 3 ) {

                        const x = array[ i ];
                        const y = array[ i + 1 ];
                        const z = array[ i + 2 ];

                        if ( x < minX ) minX = x;
                        if ( y < minY ) minY = y;
                        if ( z < minZ ) minZ = z;

                        if ( x > maxX ) maxX = x;
                        if ( y > maxY ) maxY = y;
                        if ( z > maxZ ) maxZ = z;

                }

                this.min.set( minX, minY, minZ );
                this.max.set( maxX, maxY, maxZ );

                return this;

        }

        setFromBufferAttribute( attribute ) {

                let minX = + Infinity;
                let minY = + Infinity;
                let minZ = + Infinity;

                let maxX = - Infinity;
                let maxY = - Infinity;
                let maxZ = - Infinity;

                for ( let i = 0, l = attribute.count; i < l; i ++ ) {

                        const x = attribute.getX( i );
                        const y = attribute.getY( i );
                        const z = attribute.getZ( i );

                        if ( x < minX ) minX = x;
                        if ( y < minY ) minY = y;
                        if ( z < minZ ) minZ = z;

                        if ( x > maxX ) maxX = x;
                        if ( y > maxY ) maxY = y;
                        if ( z > maxZ ) maxZ = z;

                }

                this.min.set( minX, minY, minZ );
                this.max.set( maxX, maxY, maxZ );

                return this;

        }

        setFromPoints( points ) {

                this.makeEmpty();

                for ( let i = 0, il = points.length; i < il; i ++ ) {

                        this.expandByPoint( points[ i ] );

                }

                return this;

        }

        setFromCenterAndSize( center, size ) {

                const halfSize = _vector$1.copy( size ).multiplyScalar( 0.5 );

                this.min.copy( center ).sub( halfSize );
                this.max.copy( center ).add( halfSize );

                return this;

        }

        setFromObject( object ) {

                this.makeEmpty();

                return this.expandByObject( object );

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( box ) {

                this.min.copy( box.min );
                this.max.copy( box.max );

                return this;

        }

        makeEmpty() {

                this.min.x = this.min.y = this.min.z = + Infinity;
                this.max.x = this.max.y = this.max.z = - Infinity;

                return this;

        }

        isEmpty() {

                // this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes

                return ( this.max.x < this.min.x ) || ( this.max.y < this.min.y ) || ( this.max.z < this.min.z );

        }

        getCenter( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Box3: .getCenter() target is now required' );
                        target = new Vector3();

                }

                return this.isEmpty() ? target.set( 0, 0, 0 ) : target.addVectors( this.min, this.max ).multiplyScalar( 0.5 );

        }

        getSize( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Box3: .getSize() target is now required' );
                        target = new Vector3();

                }

                return this.isEmpty() ? target.set( 0, 0, 0 ) : target.subVectors( this.max, this.min );

        }

        expandByPoint( point ) {

                this.min.min( point );
                this.max.max( point );

                return this;

        }

        expandByVector( vector ) {

                this.min.sub( vector );
                this.max.add( vector );

                return this;

        }

        expandByScalar( scalar ) {

                this.min.addScalar( - scalar );
                this.max.addScalar( scalar );

                return this;

        }

        expandByObject( object ) {

                // Computes the world-axis-aligned bounding box of an object (including its children),
                // accounting for both the object's, and children's, world transforms

                object.updateWorldMatrix( false, false );

                const geometry = object.geometry;

                if ( geometry !== undefined ) {

                        if ( geometry.boundingBox === null ) {

                                geometry.computeBoundingBox();

                        }

                        _box.copy( geometry.boundingBox );
                        _box.applyMatrix4( object.matrixWorld );

                        this.union( _box );

                }

                const children = object.children;

                for ( let i = 0, l = children.length; i < l; i ++ ) {

                        this.expandByObject( children[ i ] );

                }

                return this;

        }

        containsPoint( point ) {

                return point.x < this.min.x || point.x > this.max.x ||
                        point.y < this.min.y || point.y > this.max.y ||
                        point.z < this.min.z || point.z > this.max.z ? false : true;

        }

        containsBox( box ) {

                return this.min.x <= box.min.x && box.max.x <= this.max.x &&
                        this.min.y <= box.min.y && box.max.y <= this.max.y &&
                        this.min.z <= box.min.z && box.max.z <= this.max.z;

        }

        getParameter( point, target ) {

                // This can potentially have a divide by zero if the box
                // has a size dimension of 0.

                if ( target === undefined ) {

                        console.warn( 'THREE.Box3: .getParameter() target is now required' );
                        target = new Vector3();

                }

                return target.set(
                        ( point.x - this.min.x ) / ( this.max.x - this.min.x ),
                        ( point.y - this.min.y ) / ( this.max.y - this.min.y ),
                        ( point.z - this.min.z ) / ( this.max.z - this.min.z )
                );

        }

        intersectsBox( box ) {

                // using 6 splitting planes to rule out intersections.
                return box.max.x < this.min.x || box.min.x > this.max.x ||
                        box.max.y < this.min.y || box.min.y > this.max.y ||
                        box.max.z < this.min.z || box.min.z > this.max.z ? false : true;

        }

        intersectsSphere( sphere ) {

                // Find the point on the AABB closest to the sphere center.
                this.clampPoint( sphere.center, _vector$1 );

                // If that point is inside the sphere, the AABB and sphere intersect.
                return _vector$1.distanceToSquared( sphere.center ) <= ( sphere.radius * sphere.radius );

        }

        intersectsPlane( plane ) {

                // We compute the minimum and maximum dot product values. If those values
                // are on the same side (back or front) of the plane, then there is no intersection.

                let min, max;

                if ( plane.normal.x > 0 ) {

                        min = plane.normal.x * this.min.x;
                        max = plane.normal.x * this.max.x;

                } else {

                        min = plane.normal.x * this.max.x;
                        max = plane.normal.x * this.min.x;

                }

                if ( plane.normal.y > 0 ) {

                        min += plane.normal.y * this.min.y;
                        max += plane.normal.y * this.max.y;

                } else {

                        min += plane.normal.y * this.max.y;
                        max += plane.normal.y * this.min.y;

                }

                if ( plane.normal.z > 0 ) {

                        min += plane.normal.z * this.min.z;
                        max += plane.normal.z * this.max.z;

                } else {

                        min += plane.normal.z * this.max.z;
                        max += plane.normal.z * this.min.z;

                }

                return ( min <= - plane.constant && max >= - plane.constant );

        }

        intersectsTriangle( triangle ) {

                if ( this.isEmpty() ) {

                        return false;

                }

                // compute box center and extents
                this.getCenter( _center );
                _extents.subVectors( this.max, _center );

                // translate triangle to aabb origin
                _v0.subVectors( triangle.a, _center );
                _v1.subVectors( triangle.b, _center );
                _v2.subVectors( triangle.c, _center );

                // compute edge vectors for triangle
                _f0.subVectors( _v1, _v0 );
                _f1.subVectors( _v2, _v1 );
                _f2.subVectors( _v0, _v2 );

                // test against axes that are given by cross product combinations of the edges of the triangle and the edges of the aabb
                // make an axis testing of each of the 3 sides of the aabb against each of the 3 sides of the triangle = 9 axis of separation
                // axis_ij = u_i x f_j (u0, u1, u2 = face normals of aabb = x,y,z axes vectors since aabb is axis aligned)
                let axes = [
                        0, - _f0.z, _f0.y, 0, - _f1.z, _f1.y, 0, - _f2.z, _f2.y,
                        _f0.z, 0, - _f0.x, _f1.z, 0, - _f1.x, _f2.z, 0, - _f2.x,
                        - _f0.y, _f0.x, 0, - _f1.y, _f1.x, 0, - _f2.y, _f2.x, 0
                ];
                if ( ! satForAxes( axes, _v0, _v1, _v2, _extents ) ) {

                        return false;

                }

                // test 3 face normals from the aabb
                axes = [ 1, 0, 0, 0, 1, 0, 0, 0, 1 ];
                if ( ! satForAxes( axes, _v0, _v1, _v2, _extents ) ) {

                        return false;

                }

                // finally testing the face normal of the triangle
                // use already existing triangle edge vectors here
                _triangleNormal.crossVectors( _f0, _f1 );
                axes = [ _triangleNormal.x, _triangleNormal.y, _triangleNormal.z ];

                return satForAxes( axes, _v0, _v1, _v2, _extents );

        }

        clampPoint( point, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Box3: .clampPoint() target is now required' );
                        target = new Vector3();

                }

                return target.copy( point ).clamp( this.min, this.max );

        }

        distanceToPoint( point ) {

                const clampedPoint = _vector$1.copy( point ).clamp( this.min, this.max );

                return clampedPoint.sub( point ).length();

        }

        getBoundingSphere( target ) {

                if ( target === undefined ) {

                        console.error( 'THREE.Box3: .getBoundingSphere() target is now required' );
                        //target = new Sphere(); // removed to avoid cyclic dependency

                }

                this.getCenter( target.center );

                target.radius = this.getSize( _vector$1 ).length() * 0.5;

                return target;

        }

        intersect( box ) {

                this.min.max( box.min );
                this.max.min( box.max );

                // ensure that if there is no overlap, the result is fully empty, not slightly empty with non-inf/+inf values that will cause subsequence intersects to erroneously return valid values.
                if ( this.isEmpty() ) this.makeEmpty();

                return this;

        }

        union( box ) {

                this.min.min( box.min );
                this.max.max( box.max );

                return this;

        }

        applyMatrix4( matrix ) {

                // transform of empty box is an empty box.
                if ( this.isEmpty() ) return this;

                // NOTE: I am using a binary pattern to specify all 2^3 combinations below
                _points[ 0 ].set( this.min.x, this.min.y, this.min.z ).applyMatrix4( matrix ); // 000
                _points[ 1 ].set( this.min.x, this.min.y, this.max.z ).applyMatrix4( matrix ); // 001
                _points[ 2 ].set( this.min.x, this.max.y, this.min.z ).applyMatrix4( matrix ); // 010
                _points[ 3 ].set( this.min.x, this.max.y, this.max.z ).applyMatrix4( matrix ); // 011
                _points[ 4 ].set( this.max.x, this.min.y, this.min.z ).applyMatrix4( matrix ); // 100
                _points[ 5 ].set( this.max.x, this.min.y, this.max.z ).applyMatrix4( matrix ); // 101
                _points[ 6 ].set( this.max.x, this.max.y, this.min.z ).applyMatrix4( matrix ); // 110
                _points[ 7 ].set( this.max.x, this.max.y, this.max.z ).applyMatrix4( matrix ); // 111

                this.setFromPoints( _points );

                return this;

        }

        translate( offset ) {

                this.min.add( offset );
                this.max.add( offset );

                return this;

        }

        equals( box ) {

                return box.min.equals( this.min ) && box.max.equals( this.max );

        }

}

function satForAxes( axes, v0, v1, v2, extents ) {

        for ( let i = 0, j = axes.length - 3; i <= j; i += 3 ) {

                _testAxis.fromArray( axes, i );
                // project the aabb onto the seperating axis
                const r = extents.x * Math.abs( _testAxis.x ) + extents.y * Math.abs( _testAxis.y ) + extents.z * Math.abs( _testAxis.z );
                // project all 3 vertices of the triangle onto the seperating axis
                const p0 = v0.dot( _testAxis );
                const p1 = v1.dot( _testAxis );
                const p2 = v2.dot( _testAxis );
                // actual test, basically see if either of the most extreme of the triangle points intersects r
                if ( Math.max( - Math.max( p0, p1, p2 ), Math.min( p0, p1, p2 ) ) > r ) {

                        // points of the projected triangle are outside the projected half-length of the aabb
                        // the axis is seperating and we can exit
                        return false;

                }

        }

        return true;

}

const _points = [
        /*@__PURE__*/ new Vector3(),
        /*@__PURE__*/ new Vector3(),
        /*@__PURE__*/ new Vector3(),
        /*@__PURE__*/ new Vector3(),
        /*@__PURE__*/ new Vector3(),
        /*@__PURE__*/ new Vector3(),
        /*@__PURE__*/ new Vector3(),
        /*@__PURE__*/ new Vector3()
];

const _vector$1 = /*@__PURE__*/ new Vector3();

const _box = /*@__PURE__*/ new Box3();

// triangle centered vertices

const _v0 = /*@__PURE__*/ new Vector3();
const _v1 = /*@__PURE__*/ new Vector3();
const _v2 = /*@__PURE__*/ new Vector3();

// triangle edge vectors

const _f0 = /*@__PURE__*/ new Vector3();
const _f1 = /*@__PURE__*/ new Vector3();
const _f2 = /*@__PURE__*/ new Vector3();

const _center = /*@__PURE__*/ new Vector3();
const _extents = /*@__PURE__*/ new Vector3();
const _triangleNormal = /*@__PURE__*/ new Vector3();
const _testAxis = /*@__PURE__*/ new Vector3();

const _box$1 = /*@__PURE__*/ new Box3();

class Sphere {

        constructor( center, radius ) {

                this.center = ( center !== undefined ) ? center : new Vector3();
                this.radius = ( radius !== undefined ) ? radius : - 1;

        }

        set( center, radius ) {

                this.center.copy( center );
                this.radius = radius;

                return this;

        }

        setFromPoints( points, optionalCenter ) {

                const center = this.center;

                if ( optionalCenter !== undefined ) {

                        center.copy( optionalCenter );

                } else {

                        _box$1.setFromPoints( points ).getCenter( center );

                }

                let maxRadiusSq = 0;

                for ( let i = 0, il = points.length; i < il; i ++ ) {

                        maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( points[ i ] ) );

                }

                this.radius = Math.sqrt( maxRadiusSq );

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( sphere ) {

                this.center.copy( sphere.center );
                this.radius = sphere.radius;

                return this;

        }

        isEmpty() {

                return ( this.radius < 0 );

        }

        makeEmpty() {

                this.center.set( 0, 0, 0 );
                this.radius = - 1;

                return this;

        }

        containsPoint( point ) {

                return ( point.distanceToSquared( this.center ) <= ( this.radius * this.radius ) );

        }

        distanceToPoint( point ) {

                return ( point.distanceTo( this.center ) - this.radius );

        }

        intersectsSphere( sphere ) {

                const radiusSum = this.radius + sphere.radius;

                return sphere.center.distanceToSquared( this.center ) <= ( radiusSum * radiusSum );

        }

        intersectsBox( box ) {

                return box.intersectsSphere( this );

        }

        intersectsPlane( plane ) {

                return Math.abs( plane.distanceToPoint( this.center ) ) <= this.radius;

        }

        clampPoint( point, target ) {

                const deltaLengthSq = this.center.distanceToSquared( point );

                if ( target === undefined ) {

                        console.warn( 'THREE.Sphere: .clampPoint() target is now required' );
                        target = new Vector3();

                }

                target.copy( point );

                if ( deltaLengthSq > ( this.radius * this.radius ) ) {

                        target.sub( this.center ).normalize();
                        target.multiplyScalar( this.radius ).add( this.center );

                }

                return target;

        }

        getBoundingBox( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Sphere: .getBoundingBox() target is now required' );
                        target = new Box3();

                }

                if ( this.isEmpty() ) {

                        // Empty sphere produces empty bounding box
                        target.makeEmpty();
                        return target;

                }

                target.set( this.center, this.center );
                target.expandByScalar( this.radius );

                return target;

        }

        applyMatrix4( matrix ) {

                this.center.applyMatrix4( matrix );
                this.radius = this.radius * matrix.getMaxScaleOnAxis();

                return this;

        }

        translate( offset ) {

                this.center.add( offset );

                return this;

        }

        equals( sphere ) {

                return sphere.center.equals( this.center ) && ( sphere.radius === this.radius );

        }

}

const _vector$2 = /*@__PURE__*/ new Vector3();
const _segCenter = /*@__PURE__*/ new Vector3();
const _segDir = /*@__PURE__*/ new Vector3();
const _diff = /*@__PURE__*/ new Vector3();

const _edge1 = /*@__PURE__*/ new Vector3();
const _edge2 = /*@__PURE__*/ new Vector3();
const _normal = /*@__PURE__*/ new Vector3();

class Ray {

        constructor( origin, direction ) {

                this.origin = ( origin !== undefined ) ? origin : new Vector3();
                this.direction = ( direction !== undefined ) ? direction : new Vector3( 0, 0, - 1 );

        }

        set( origin, direction ) {

                this.origin.copy( origin );
                this.direction.copy( direction );

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( ray ) {

                this.origin.copy( ray.origin );
                this.direction.copy( ray.direction );

                return this;

        }

        at( t, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Ray: .at() target is now required' );
                        target = new Vector3();

                }

                return target.copy( this.direction ).multiplyScalar( t ).add( this.origin );

        }

        lookAt( v ) {

                this.direction.copy( v ).sub( this.origin ).normalize();

                return this;

        }

        recast( t ) {

                this.origin.copy( this.at( t, _vector$2 ) );

                return this;

        }

        closestPointToPoint( point, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Ray: .closestPointToPoint() target is now required' );
                        target = new Vector3();

                }

                target.subVectors( point, this.origin );

                const directionDistance = target.dot( this.direction );

                if ( directionDistance < 0 ) {

                        return target.copy( this.origin );

                }

                return target.copy( this.direction ).multiplyScalar( directionDistance ).add( this.origin );

        }

        distanceToPoint( point ) {

                return Math.sqrt( this.distanceSqToPoint( point ) );

        }

        distanceSqToPoint( point ) {

                const directionDistance = _vector$2.subVectors( point, this.origin ).dot( this.direction );

                // point behind the ray

                if ( directionDistance < 0 ) {

                        return this.origin.distanceToSquared( point );

                }

                _vector$2.copy( this.direction ).multiplyScalar( directionDistance ).add( this.origin );

                return _vector$2.distanceToSquared( point );

        }

        distanceSqToSegment( v0, v1, optionalPointOnRay, optionalPointOnSegment ) {

                // from http://www.geometrictools.com/GTEngine/Include/Mathematics/GteDistRaySegment.h
                // It returns the min distance between the ray and the segment
                // defined by v0 and v1
                // It can also set two optional targets :
                // - The closest point on the ray
                // - The closest point on the segment

                _segCenter.copy( v0 ).add( v1 ).multiplyScalar( 0.5 );
                _segDir.copy( v1 ).sub( v0 ).normalize();
                _diff.copy( this.origin ).sub( _segCenter );

                const segExtent = v0.distanceTo( v1 ) * 0.5;
                const a01 = - this.direction.dot( _segDir );
                const b0 = _diff.dot( this.direction );
                const b1 = - _diff.dot( _segDir );
                const c = _diff.lengthSq();
                const det = Math.abs( 1 - a01 * a01 );
                let s0, s1, sqrDist, extDet;

                if ( det > 0 ) {

                        // The ray and segment are not parallel.

                        s0 = a01 * b1 - b0;
                        s1 = a01 * b0 - b1;
                        extDet = segExtent * det;

                        if ( s0 >= 0 ) {

                                if ( s1 >= - extDet ) {

                                        if ( s1 <= extDet ) {

                                                // region 0
                                                // Minimum at interior points of ray and segment.

                                                const invDet = 1 / det;
                                                s0 *= invDet;
                                                s1 *= invDet;
                                                sqrDist = s0 * ( s0 + a01 * s1 + 2 * b0 ) + s1 * ( a01 * s0 + s1 + 2 * b1 ) + c;

                                        } else {

                                                // region 1

                                                s1 = segExtent;
                                                s0 = Math.max( 0, - ( a01 * s1 + b0 ) );
                                                sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

                                        }

                                } else {

                                        // region 5

                                        s1 = - segExtent;
                                        s0 = Math.max( 0, - ( a01 * s1 + b0 ) );
                                        sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

                                }

                        } else {

                                if ( s1 <= - extDet ) {

                                        // region 4

                                        s0 = Math.max( 0, - ( - a01 * segExtent + b0 ) );
                                        s1 = ( s0 > 0 ) ? - segExtent : Math.min( Math.max( - segExtent, - b1 ), segExtent );
                                        sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

                                } else if ( s1 <= extDet ) {

                                        // region 3

                                        s0 = 0;
                                        s1 = Math.min( Math.max( - segExtent, - b1 ), segExtent );
                                        sqrDist = s1 * ( s1 + 2 * b1 ) + c;

                                } else {

                                        // region 2

                                        s0 = Math.max( 0, - ( a01 * segExtent + b0 ) );
                                        s1 = ( s0 > 0 ) ? segExtent : Math.min( Math.max( - segExtent, - b1 ), segExtent );
                                        sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

                                }

                        }

                } else {

                        // Ray and segment are parallel.

                        s1 = ( a01 > 0 ) ? - segExtent : segExtent;
                        s0 = Math.max( 0, - ( a01 * s1 + b0 ) );
                        sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

                }

                if ( optionalPointOnRay ) {

                        optionalPointOnRay.copy( this.direction ).multiplyScalar( s0 ).add( this.origin );

                }

                if ( optionalPointOnSegment ) {

                        optionalPointOnSegment.copy( _segDir ).multiplyScalar( s1 ).add( _segCenter );

                }

                return sqrDist;

        }

        intersectSphere( sphere, target ) {

                _vector$2.subVectors( sphere.center, this.origin );
                const tca = _vector$2.dot( this.direction );
                const d2 = _vector$2.dot( _vector$2 ) - tca * tca;
                const radius2 = sphere.radius * sphere.radius;

                if ( d2 > radius2 ) return null;

                const thc = Math.sqrt( radius2 - d2 );

                // t0 = first intersect point - entrance on front of sphere
                const t0 = tca - thc;

                // t1 = second intersect point - exit point on back of sphere
                const t1 = tca + thc;

                // test to see if both t0 and t1 are behind the ray - if so, return null
                if ( t0 < 0 && t1 < 0 ) return null;

                // test to see if t0 is behind the ray:
                // if it is, the ray is inside the sphere, so return the second exit point scaled by t1,
                // in order to always return an intersect point that is in front of the ray.
                if ( t0 < 0 ) return this.at( t1, target );

                // else t0 is in front of the ray, so return the first collision point scaled by t0
                return this.at( t0, target );

        }

        intersectsSphere( sphere ) {

                return this.distanceSqToPoint( sphere.center ) <= ( sphere.radius * sphere.radius );

        }

        distanceToPlane( plane ) {

                const denominator = plane.normal.dot( this.direction );

                if ( denominator === 0 ) {

                        // line is coplanar, return origin
                        if ( plane.distanceToPoint( this.origin ) === 0 ) {

                                return 0;

                        }

                        // Null is preferable to undefined since undefined means.... it is undefined

                        return null;

                }

                const t = - ( this.origin.dot( plane.normal ) + plane.constant ) / denominator;

                // Return if the ray never intersects the plane

                return t >= 0 ? t : null;

        }

        intersectPlane( plane, target ) {

                const t = this.distanceToPlane( plane );

                if ( t === null ) {

                        return null;

                }

                return this.at( t, target );

        }

        intersectsPlane( plane ) {

                // check if the ray lies on the plane first

                const distToPoint = plane.distanceToPoint( this.origin );

                if ( distToPoint === 0 ) {

                        return true;

                }

                const denominator = plane.normal.dot( this.direction );

                if ( denominator * distToPoint < 0 ) {

                        return true;

                }

                // ray origin is behind the plane (and is pointing behind it)

                return false;

        }

        intersectBox( box, target ) {

                let tmin, tmax, tymin, tymax, tzmin, tzmax;

                const invdirx = 1 / this.direction.x,
                        invdiry = 1 / this.direction.y,
                        invdirz = 1 / this.direction.z;

                const origin = this.origin;

                if ( invdirx >= 0 ) {

                        tmin = ( box.min.x - origin.x ) * invdirx;
                        tmax = ( box.max.x - origin.x ) * invdirx;

                } else {

                        tmin = ( box.max.x - origin.x ) * invdirx;
                        tmax = ( box.min.x - origin.x ) * invdirx;

                }

                if ( invdiry >= 0 ) {

                        tymin = ( box.min.y - origin.y ) * invdiry;
                        tymax = ( box.max.y - origin.y ) * invdiry;

                } else {

                        tymin = ( box.max.y - origin.y ) * invdiry;
                        tymax = ( box.min.y - origin.y ) * invdiry;

                }

                if ( ( tmin > tymax ) || ( tymin > tmax ) ) return null;

                // These lines also handle the case where tmin or tmax is NaN
                // (result of 0 * Infinity). x !== x returns true if x is NaN

                if ( tymin > tmin || tmin !== tmin ) tmin = tymin;

                if ( tymax < tmax || tmax !== tmax ) tmax = tymax;

                if ( invdirz >= 0 ) {

                        tzmin = ( box.min.z - origin.z ) * invdirz;
                        tzmax = ( box.max.z - origin.z ) * invdirz;

                } else {

                        tzmin = ( box.max.z - origin.z ) * invdirz;
                        tzmax = ( box.min.z - origin.z ) * invdirz;

                }

                if ( ( tmin > tzmax ) || ( tzmin > tmax ) ) return null;

                if ( tzmin > tmin || tmin !== tmin ) tmin = tzmin;

                if ( tzmax < tmax || tmax !== tmax ) tmax = tzmax;

                //return point closest to the ray (positive side)

                if ( tmax < 0 ) return null;

                return this.at( tmin >= 0 ? tmin : tmax, target );

        }

        intersectsBox( box ) {

                return this.intersectBox( box, _vector$2 ) !== null;

        }

        intersectTriangle( a, b, c, backfaceCulling, target ) {

                // Compute the offset origin, edges, and normal.

                // from http://www.geometrictools.com/GTEngine/Include/Mathematics/GteIntrRay3Triangle3.h

                _edge1.subVectors( b, a );
                _edge2.subVectors( c, a );
                _normal.crossVectors( _edge1, _edge2 );

                // Solve Q + t*D = b1*E1 + b2*E2 (Q = kDiff, D = ray direction,
                // E1 = kEdge1, E2 = kEdge2, N = Cross(E1,E2)) by
                //   |Dot(D,N)|*b1 = sign(Dot(D,N))*Dot(D,Cross(Q,E2))
                //   |Dot(D,N)|*b2 = sign(Dot(D,N))*Dot(D,Cross(E1,Q))
                //   |Dot(D,N)|*t = -sign(Dot(D,N))*Dot(Q,N)
                let DdN = this.direction.dot( _normal );
                let sign;

                if ( DdN > 0 ) {

                        if ( backfaceCulling ) return null;
                        sign = 1;

                } else if ( DdN < 0 ) {

                        sign = - 1;
                        DdN = - DdN;

                } else {

                        return null;

                }

                _diff.subVectors( this.origin, a );
                const DdQxE2 = sign * this.direction.dot( _edge2.crossVectors( _diff, _edge2 ) );

                // b1 < 0, no intersection
                if ( DdQxE2 < 0 ) {

                        return null;

                }

                const DdE1xQ = sign * this.direction.dot( _edge1.cross( _diff ) );

                // b2 < 0, no intersection
                if ( DdE1xQ < 0 ) {

                        return null;

                }

                // b1+b2 > 1, no intersection
                if ( DdQxE2 + DdE1xQ > DdN ) {

                        return null;

                }

                // Line intersects triangle, check if ray does.
                const QdN = - sign * _diff.dot( _normal );

                // t < 0, no intersection
                if ( QdN < 0 ) {

                        return null;

                }

                // Ray intersects triangle.
                return this.at( QdN / DdN, target );

        }

        applyMatrix4( matrix4 ) {

                this.origin.applyMatrix4( matrix4 );
                this.direction.transformDirection( matrix4 );

                return this;

        }

        equals( ray ) {

                return ray.origin.equals( this.origin ) && ray.direction.equals( this.direction );

        }

}

class Matrix4 {

        constructor() {

                Object.defineProperty( this, 'isMatrix4', { value: true } );

                this.elements = [

                        1, 0, 0, 0,
                        0, 1, 0, 0,
                        0, 0, 1, 0,
                        0, 0, 0, 1

                ];

                if ( arguments.length > 0 ) {

                        console.error( 'THREE.Matrix4: the constructor no longer reads arguments. use .set() instead.' );

                }

        }

        set( n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44 ) {

                const te = this.elements;

                te[ 0 ] = n11; te[ 4 ] = n12; te[ 8 ] = n13; te[ 12 ] = n14;
                te[ 1 ] = n21; te[ 5 ] = n22; te[ 9 ] = n23; te[ 13 ] = n24;
                te[ 2 ] = n31; te[ 6 ] = n32; te[ 10 ] = n33; te[ 14 ] = n34;
                te[ 3 ] = n41; te[ 7 ] = n42; te[ 11 ] = n43; te[ 15 ] = n44;

                return this;

        }

        identity() {

                this.set(

                        1, 0, 0, 0,
                        0, 1, 0, 0,
                        0, 0, 1, 0,
                        0, 0, 0, 1

                );

                return this;

        }

        clone() {

                return new Matrix4().fromArray( this.elements );

        }

        copy( m ) {

                const te = this.elements;
                const me = m.elements;

                te[ 0 ] = me[ 0 ]; te[ 1 ] = me[ 1 ]; te[ 2 ] = me[ 2 ]; te[ 3 ] = me[ 3 ];
                te[ 4 ] = me[ 4 ]; te[ 5 ] = me[ 5 ]; te[ 6 ] = me[ 6 ]; te[ 7 ] = me[ 7 ];
                te[ 8 ] = me[ 8 ]; te[ 9 ] = me[ 9 ]; te[ 10 ] = me[ 10 ]; te[ 11 ] = me[ 11 ];
                te[ 12 ] = me[ 12 ]; te[ 13 ] = me[ 13 ]; te[ 14 ] = me[ 14 ]; te[ 15 ] = me[ 15 ];

                return this;

        }

        copyPosition( m ) {

                const te = this.elements, me = m.elements;

                te[ 12 ] = me[ 12 ];
                te[ 13 ] = me[ 13 ];
                te[ 14 ] = me[ 14 ];

                return this;

        }

        extractBasis( xAxis, yAxis, zAxis ) {

                xAxis.setFromMatrixColumn( this, 0 );
                yAxis.setFromMatrixColumn( this, 1 );
                zAxis.setFromMatrixColumn( this, 2 );

                return this;

        }

        makeBasis( xAxis, yAxis, zAxis ) {

                this.set(
                        xAxis.x, yAxis.x, zAxis.x, 0,
                        xAxis.y, yAxis.y, zAxis.y, 0,
                        xAxis.z, yAxis.z, zAxis.z, 0,
                        0, 0, 0, 1
                );

                return this;

        }

        extractRotation( m ) {

                // this method does not support reflection matrices

                const te = this.elements;
                const me = m.elements;

                const scaleX = 1 / _v1$1.setFromMatrixColumn( m, 0 ).length();
                const scaleY = 1 / _v1$1.setFromMatrixColumn( m, 1 ).length();
                const scaleZ = 1 / _v1$1.setFromMatrixColumn( m, 2 ).length();

                te[ 0 ] = me[ 0 ] * scaleX;
                te[ 1 ] = me[ 1 ] * scaleX;
                te[ 2 ] = me[ 2 ] * scaleX;
                te[ 3 ] = 0;

                te[ 4 ] = me[ 4 ] * scaleY;
                te[ 5 ] = me[ 5 ] * scaleY;
                te[ 6 ] = me[ 6 ] * scaleY;
                te[ 7 ] = 0;

                te[ 8 ] = me[ 8 ] * scaleZ;
                te[ 9 ] = me[ 9 ] * scaleZ;
                te[ 10 ] = me[ 10 ] * scaleZ;
                te[ 11 ] = 0;

                te[ 12 ] = 0;
                te[ 13 ] = 0;
                te[ 14 ] = 0;
                te[ 15 ] = 1;

                return this;

        }

        makeRotationFromEuler( euler ) {

                if ( ! ( euler && euler.isEuler ) ) {

                        console.error( 'THREE.Matrix4: .makeRotationFromEuler() now expects a Euler rotation rather than a Vector3 and order.' );

                }

                const te = this.elements;

                const x = euler.x, y = euler.y, z = euler.z;
                const a = Math.cos( x ), b = Math.sin( x );
                const c = Math.cos( y ), d = Math.sin( y );
                const e = Math.cos( z ), f = Math.sin( z );

                if ( euler.order === 'XYZ' ) {

                        const ae = a * e, af = a * f, be = b * e, bf = b * f;

                        te[ 0 ] = c * e;
                        te[ 4 ] = - c * f;
                        te[ 8 ] = d;

                        te[ 1 ] = af + be * d;
                        te[ 5 ] = ae - bf * d;
                        te[ 9 ] = - b * c;

                        te[ 2 ] = bf - ae * d;
                        te[ 6 ] = be + af * d;
                        te[ 10 ] = a * c;

                } else if ( euler.order === 'YXZ' ) {

                        const ce = c * e, cf = c * f, de = d * e, df = d * f;

                        te[ 0 ] = ce + df * b;
                        te[ 4 ] = de * b - cf;
                        te[ 8 ] = a * d;

                        te[ 1 ] = a * f;
                        te[ 5 ] = a * e;
                        te[ 9 ] = - b;

                        te[ 2 ] = cf * b - de;
                        te[ 6 ] = df + ce * b;
                        te[ 10 ] = a * c;

                } else if ( euler.order === 'ZXY' ) {

                        const ce = c * e, cf = c * f, de = d * e, df = d * f;

                        te[ 0 ] = ce - df * b;
                        te[ 4 ] = - a * f;
                        te[ 8 ] = de + cf * b;

                        te[ 1 ] = cf + de * b;
                        te[ 5 ] = a * e;
                        te[ 9 ] = df - ce * b;

                        te[ 2 ] = - a * d;
                        te[ 6 ] = b;
                        te[ 10 ] = a * c;

                } else if ( euler.order === 'ZYX' ) {

                        const ae = a * e, af = a * f, be = b * e, bf = b * f;

                        te[ 0 ] = c * e;
                        te[ 4 ] = be * d - af;
                        te[ 8 ] = ae * d + bf;

                        te[ 1 ] = c * f;
                        te[ 5 ] = bf * d + ae;
                        te[ 9 ] = af * d - be;

                        te[ 2 ] = - d;
                        te[ 6 ] = b * c;
                        te[ 10 ] = a * c;

                } else if ( euler.order === 'YZX' ) {

                        const ac = a * c, ad = a * d, bc = b * c, bd = b * d;

                        te[ 0 ] = c * e;
                        te[ 4 ] = bd - ac * f;
                        te[ 8 ] = bc * f + ad;

                        te[ 1 ] = f;
                        te[ 5 ] = a * e;
                        te[ 9 ] = - b * e;

                        te[ 2 ] = - d * e;
                        te[ 6 ] = ad * f + bc;
                        te[ 10 ] = ac - bd * f;

                } else if ( euler.order === 'XZY' ) {

                        const ac = a * c, ad = a * d, bc = b * c, bd = b * d;

                        te[ 0 ] = c * e;
                        te[ 4 ] = - f;
                        te[ 8 ] = d * e;

                        te[ 1 ] = ac * f + bd;
                        te[ 5 ] = a * e;
                        te[ 9 ] = ad * f - bc;

                        te[ 2 ] = bc * f - ad;
                        te[ 6 ] = b * e;
                        te[ 10 ] = bd * f + ac;

                }

                // bottom row
                te[ 3 ] = 0;
                te[ 7 ] = 0;
                te[ 11 ] = 0;

                // last column
                te[ 12 ] = 0;
                te[ 13 ] = 0;
                te[ 14 ] = 0;
                te[ 15 ] = 1;

                return this;

        }

        makeRotationFromQuaternion( q ) {

                return this.compose( _zero, q, _one );

        }

        lookAt( eye, target, up ) {

                const te = this.elements;

                _z.subVectors( eye, target );

                if ( _z.lengthSq() === 0 ) {

                        // eye and target are in the same position

                        _z.z = 1;

                }

                _z.normalize();
                _x.crossVectors( up, _z );

                if ( _x.lengthSq() === 0 ) {

                        // up and z are parallel

                        if ( Math.abs( up.z ) === 1 ) {

                                _z.x += 0.0001;

                        } else {

                                _z.z += 0.0001;

                        }

                        _z.normalize();
                        _x.crossVectors( up, _z );

                }

                _x.normalize();
                _y.crossVectors( _z, _x );

                te[ 0 ] = _x.x; te[ 4 ] = _y.x; te[ 8 ] = _z.x;
                te[ 1 ] = _x.y; te[ 5 ] = _y.y; te[ 9 ] = _z.y;
                te[ 2 ] = _x.z; te[ 6 ] = _y.z; te[ 10 ] = _z.z;

                return this;

        }

        multiply( m, n ) {

                if ( n !== undefined ) {

                        console.warn( 'THREE.Matrix4: .multiply() now only accepts one argument. Use .multiplyMatrices( a, b ) instead.' );
                        return this.multiplyMatrices( m, n );

                }

                return this.multiplyMatrices( this, m );

        }

        premultiply( m ) {

                return this.multiplyMatrices( m, this );

        }

        multiplyMatrices( a, b ) {

                const ae = a.elements;
                const be = b.elements;
                const te = this.elements;

                const a11 = ae[ 0 ], a12 = ae[ 4 ], a13 = ae[ 8 ], a14 = ae[ 12 ];
                const a21 = ae[ 1 ], a22 = ae[ 5 ], a23 = ae[ 9 ], a24 = ae[ 13 ];
                const a31 = ae[ 2 ], a32 = ae[ 6 ], a33 = ae[ 10 ], a34 = ae[ 14 ];
                const a41 = ae[ 3 ], a42 = ae[ 7 ], a43 = ae[ 11 ], a44 = ae[ 15 ];

                const b11 = be[ 0 ], b12 = be[ 4 ], b13 = be[ 8 ], b14 = be[ 12 ];
                const b21 = be[ 1 ], b22 = be[ 5 ], b23 = be[ 9 ], b24 = be[ 13 ];
                const b31 = be[ 2 ], b32 = be[ 6 ], b33 = be[ 10 ], b34 = be[ 14 ];
                const b41 = be[ 3 ], b42 = be[ 7 ], b43 = be[ 11 ], b44 = be[ 15 ];

                te[ 0 ] = a11 * b11 + a12 * b21 + a13 * b31 + a14 * b41;
                te[ 4 ] = a11 * b12 + a12 * b22 + a13 * b32 + a14 * b42;
                te[ 8 ] = a11 * b13 + a12 * b23 + a13 * b33 + a14 * b43;
                te[ 12 ] = a11 * b14 + a12 * b24 + a13 * b34 + a14 * b44;

                te[ 1 ] = a21 * b11 + a22 * b21 + a23 * b31 + a24 * b41;
                te[ 5 ] = a21 * b12 + a22 * b22 + a23 * b32 + a24 * b42;
                te[ 9 ] = a21 * b13 + a22 * b23 + a23 * b33 + a24 * b43;
                te[ 13 ] = a21 * b14 + a22 * b24 + a23 * b34 + a24 * b44;

                te[ 2 ] = a31 * b11 + a32 * b21 + a33 * b31 + a34 * b41;
                te[ 6 ] = a31 * b12 + a32 * b22 + a33 * b32 + a34 * b42;
                te[ 10 ] = a31 * b13 + a32 * b23 + a33 * b33 + a34 * b43;
                te[ 14 ] = a31 * b14 + a32 * b24 + a33 * b34 + a34 * b44;

                te[ 3 ] = a41 * b11 + a42 * b21 + a43 * b31 + a44 * b41;
                te[ 7 ] = a41 * b12 + a42 * b22 + a43 * b32 + a44 * b42;
                te[ 11 ] = a41 * b13 + a42 * b23 + a43 * b33 + a44 * b43;
                te[ 15 ] = a41 * b14 + a42 * b24 + a43 * b34 + a44 * b44;

                return this;

        }

        multiplyScalar( s ) {

                const te = this.elements;

                te[ 0 ] *= s; te[ 4 ] *= s; te[ 8 ] *= s; te[ 12 ] *= s;
                te[ 1 ] *= s; te[ 5 ] *= s; te[ 9 ] *= s; te[ 13 ] *= s;
                te[ 2 ] *= s; te[ 6 ] *= s; te[ 10 ] *= s; te[ 14 ] *= s;
                te[ 3 ] *= s; te[ 7 ] *= s; te[ 11 ] *= s; te[ 15 ] *= s;

                return this;

        }

        determinant() {

                const te = this.elements;

                const n11 = te[ 0 ], n12 = te[ 4 ], n13 = te[ 8 ], n14 = te[ 12 ];
                const n21 = te[ 1 ], n22 = te[ 5 ], n23 = te[ 9 ], n24 = te[ 13 ];
                const n31 = te[ 2 ], n32 = te[ 6 ], n33 = te[ 10 ], n34 = te[ 14 ];
                const n41 = te[ 3 ], n42 = te[ 7 ], n43 = te[ 11 ], n44 = te[ 15 ];

                //TODO: make this more efficient
                //( based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm )

                return (
                        n41 * (
                                + n14 * n23 * n32
                                 - n13 * n24 * n32
                                 - n14 * n22 * n33
                                 + n12 * n24 * n33
                                 + n13 * n22 * n34
                                 - n12 * n23 * n34
                        ) +
                        n42 * (
                                + n11 * n23 * n34
                                 - n11 * n24 * n33
                                 + n14 * n21 * n33
                                 - n13 * n21 * n34
                                 + n13 * n24 * n31
                                 - n14 * n23 * n31
                        ) +
                        n43 * (
                                + n11 * n24 * n32
                                 - n11 * n22 * n34
                                 - n14 * n21 * n32
                                 + n12 * n21 * n34
                                 + n14 * n22 * n31
                                 - n12 * n24 * n31
                        ) +
                        n44 * (
                                - n13 * n22 * n31
                                 - n11 * n23 * n32
                                 + n11 * n22 * n33
                                 + n13 * n21 * n32
                                 - n12 * n21 * n33
                                 + n12 * n23 * n31
                        )

                );

        }

        transpose() {

                const te = this.elements;
                let tmp;

                tmp = te[ 1 ]; te[ 1 ] = te[ 4 ]; te[ 4 ] = tmp;
                tmp = te[ 2 ]; te[ 2 ] = te[ 8 ]; te[ 8 ] = tmp;
                tmp = te[ 6 ]; te[ 6 ] = te[ 9 ]; te[ 9 ] = tmp;

                tmp = te[ 3 ]; te[ 3 ] = te[ 12 ]; te[ 12 ] = tmp;
                tmp = te[ 7 ]; te[ 7 ] = te[ 13 ]; te[ 13 ] = tmp;
                tmp = te[ 11 ]; te[ 11 ] = te[ 14 ]; te[ 14 ] = tmp;

                return this;

        }

        setPosition( x, y, z ) {

                const te = this.elements;

                if ( x.isVector3 ) {

                        te[ 12 ] = x.x;
                        te[ 13 ] = x.y;
                        te[ 14 ] = x.z;

                } else {

                        te[ 12 ] = x;
                        te[ 13 ] = y;
                        te[ 14 ] = z;

                }

                return this;

        }

        invert() {

                // based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm
                const te = this.elements,

                        n11 = te[ 0 ], n21 = te[ 1 ], n31 = te[ 2 ], n41 = te[ 3 ],
                        n12 = te[ 4 ], n22 = te[ 5 ], n32 = te[ 6 ], n42 = te[ 7 ],
                        n13 = te[ 8 ], n23 = te[ 9 ], n33 = te[ 10 ], n43 = te[ 11 ],
                        n14 = te[ 12 ], n24 = te[ 13 ], n34 = te[ 14 ], n44 = te[ 15 ],

                        t11 = n23 * n34 * n42 - n24 * n33 * n42 + n24 * n32 * n43 - n22 * n34 * n43 - n23 * n32 * n44 + n22 * n33 * n44,
                        t12 = n14 * n33 * n42 - n13 * n34 * n42 - n14 * n32 * n43 + n12 * n34 * n43 + n13 * n32 * n44 - n12 * n33 * n44,
                        t13 = n13 * n24 * n42 - n14 * n23 * n42 + n14 * n22 * n43 - n12 * n24 * n43 - n13 * n22 * n44 + n12 * n23 * n44,
                        t14 = n14 * n23 * n32 - n13 * n24 * n32 - n14 * n22 * n33 + n12 * n24 * n33 + n13 * n22 * n34 - n12 * n23 * n34;

                const det = n11 * t11 + n21 * t12 + n31 * t13 + n41 * t14;

                if ( det === 0 ) return this.set( 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 );

                const detInv = 1 / det;

                te[ 0 ] = t11 * detInv;
                te[ 1 ] = ( n24 * n33 * n41 - n23 * n34 * n41 - n24 * n31 * n43 + n21 * n34 * n43 + n23 * n31 * n44 - n21 * n33 * n44 ) * detInv;
                te[ 2 ] = ( n22 * n34 * n41 - n24 * n32 * n41 + n24 * n31 * n42 - n21 * n34 * n42 - n22 * n31 * n44 + n21 * n32 * n44 ) * detInv;
                te[ 3 ] = ( n23 * n32 * n41 - n22 * n33 * n41 - n23 * n31 * n42 + n21 * n33 * n42 + n22 * n31 * n43 - n21 * n32 * n43 ) * detInv;

                te[ 4 ] = t12 * detInv;
                te[ 5 ] = ( n13 * n34 * n41 - n14 * n33 * n41 + n14 * n31 * n43 - n11 * n34 * n43 - n13 * n31 * n44 + n11 * n33 * n44 ) * detInv;
                te[ 6 ] = ( n14 * n32 * n41 - n12 * n34 * n41 - n14 * n31 * n42 + n11 * n34 * n42 + n12 * n31 * n44 - n11 * n32 * n44 ) * detInv;
                te[ 7 ] = ( n12 * n33 * n41 - n13 * n32 * n41 + n13 * n31 * n42 - n11 * n33 * n42 - n12 * n31 * n43 + n11 * n32 * n43 ) * detInv;

                te[ 8 ] = t13 * detInv;
                te[ 9 ] = ( n14 * n23 * n41 - n13 * n24 * n41 - n14 * n21 * n43 + n11 * n24 * n43 + n13 * n21 * n44 - n11 * n23 * n44 ) * detInv;
                te[ 10 ] = ( n12 * n24 * n41 - n14 * n22 * n41 + n14 * n21 * n42 - n11 * n24 * n42 - n12 * n21 * n44 + n11 * n22 * n44 ) * detInv;
                te[ 11 ] = ( n13 * n22 * n41 - n12 * n23 * n41 - n13 * n21 * n42 + n11 * n23 * n42 + n12 * n21 * n43 - n11 * n22 * n43 ) * detInv;

                te[ 12 ] = t14 * detInv;
                te[ 13 ] = ( n13 * n24 * n31 - n14 * n23 * n31 + n14 * n21 * n33 - n11 * n24 * n33 - n13 * n21 * n34 + n11 * n23 * n34 ) * detInv;
                te[ 14 ] = ( n14 * n22 * n31 - n12 * n24 * n31 - n14 * n21 * n32 + n11 * n24 * n32 + n12 * n21 * n34 - n11 * n22 * n34 ) * detInv;
                te[ 15 ] = ( n12 * n23 * n31 - n13 * n22 * n31 + n13 * n21 * n32 - n11 * n23 * n32 - n12 * n21 * n33 + n11 * n22 * n33 ) * detInv;

                return this;

        }

        scale( v ) {

                const te = this.elements;
                const x = v.x, y = v.y, z = v.z;

                te[ 0 ] *= x; te[ 4 ] *= y; te[ 8 ] *= z;
                te[ 1 ] *= x; te[ 5 ] *= y; te[ 9 ] *= z;
                te[ 2 ] *= x; te[ 6 ] *= y; te[ 10 ] *= z;
                te[ 3 ] *= x; te[ 7 ] *= y; te[ 11 ] *= z;

                return this;

        }

        getMaxScaleOnAxis() {

                const te = this.elements;

                const scaleXSq = te[ 0 ] * te[ 0 ] + te[ 1 ] * te[ 1 ] + te[ 2 ] * te[ 2 ];
                const scaleYSq = te[ 4 ] * te[ 4 ] + te[ 5 ] * te[ 5 ] + te[ 6 ] * te[ 6 ];
                const scaleZSq = te[ 8 ] * te[ 8 ] + te[ 9 ] * te[ 9 ] + te[ 10 ] * te[ 10 ];

                return Math.sqrt( Math.max( scaleXSq, scaleYSq, scaleZSq ) );

        }

        makeTranslation( x, y, z ) {

                this.set(

                        1, 0, 0, x,
                        0, 1, 0, y,
                        0, 0, 1, z,
                        0, 0, 0, 1

                );

                return this;

        }

        makeRotationX( theta ) {

                const c = Math.cos( theta ), s = Math.sin( theta );

                this.set(

                        1, 0, 0, 0,
                        0, c, - s, 0,
                        0, s, c, 0,
                        0, 0, 0, 1

                );

                return this;

        }

        makeRotationY( theta ) {

                const c = Math.cos( theta ), s = Math.sin( theta );

                this.set(

                         c, 0, s, 0,
                         0, 1, 0, 0,
                        - s, 0, c, 0,
                         0, 0, 0, 1

                );

                return this;

        }

        makeRotationZ( theta ) {

                const c = Math.cos( theta ), s = Math.sin( theta );

                this.set(

                        c, - s, 0, 0,
                        s, c, 0, 0,
                        0, 0, 1, 0,
                        0, 0, 0, 1

                );

                return this;

        }

        makeRotationAxis( axis, angle ) {

                // Based on http://www.gamedev.net/reference/articles/article1199.asp

                const c = Math.cos( angle );
                const s = Math.sin( angle );
                const t = 1 - c;
                const x = axis.x, y = axis.y, z = axis.z;
                const tx = t * x, ty = t * y;

                this.set(

                        tx * x + c, tx * y - s * z, tx * z + s * y, 0,
                        tx * y + s * z, ty * y + c, ty * z - s * x, 0,
                        tx * z - s * y, ty * z + s * x, t * z * z + c, 0,
                        0, 0, 0, 1

                );

                return this;

        }

        makeScale( x, y, z ) {

                this.set(

                        x, 0, 0, 0,
                        0, y, 0, 0,
                        0, 0, z, 0,
                        0, 0, 0, 1

                );

                return this;

        }

        makeShear( x, y, z ) {

                this.set(

                        1, y, z, 0,
                        x, 1, z, 0,
                        x, y, 1, 0,
                        0, 0, 0, 1

                );

                return this;

        }

        compose( position, quaternion, scale ) {

                const te = this.elements;

                const x = quaternion._x, y = quaternion._y, z = quaternion._z, w = quaternion._w;
                const x2 = x + x,       y2 = y + y, z2 = z + z;
                const xx = x * x2, xy = x * y2, xz = x * z2;
                const yy = y * y2, yz = y * z2, zz = z * z2;
                const wx = w * x2, wy = w * y2, wz = w * z2;

                const sx = scale.x, sy = scale.y, sz = scale.z;

                te[ 0 ] = ( 1 - ( yy + zz ) ) * sx;
                te[ 1 ] = ( xy + wz ) * sx;
                te[ 2 ] = ( xz - wy ) * sx;
                te[ 3 ] = 0;

                te[ 4 ] = ( xy - wz ) * sy;
                te[ 5 ] = ( 1 - ( xx + zz ) ) * sy;
                te[ 6 ] = ( yz + wx ) * sy;
                te[ 7 ] = 0;

                te[ 8 ] = ( xz + wy ) * sz;
                te[ 9 ] = ( yz - wx ) * sz;
                te[ 10 ] = ( 1 - ( xx + yy ) ) * sz;
                te[ 11 ] = 0;

                te[ 12 ] = position.x;
                te[ 13 ] = position.y;
                te[ 14 ] = position.z;
                te[ 15 ] = 1;

                return this;

        }

        decompose( position, quaternion, scale ) {

                const te = this.elements;

                let sx = _v1$1.set( te[ 0 ], te[ 1 ], te[ 2 ] ).length();
                const sy = _v1$1.set( te[ 4 ], te[ 5 ], te[ 6 ] ).length();
                const sz = _v1$1.set( te[ 8 ], te[ 9 ], te[ 10 ] ).length();

                // if determine is negative, we need to invert one scale
                const det = this.determinant();
                if ( det < 0 ) sx = - sx;

                position.x = te[ 12 ];
                position.y = te[ 13 ];
                position.z = te[ 14 ];

                // scale the rotation part
                _m1.copy( this );

                const invSX = 1 / sx;
                const invSY = 1 / sy;
                const invSZ = 1 / sz;

                _m1.elements[ 0 ] *= invSX;
                _m1.elements[ 1 ] *= invSX;
                _m1.elements[ 2 ] *= invSX;

                _m1.elements[ 4 ] *= invSY;
                _m1.elements[ 5 ] *= invSY;
                _m1.elements[ 6 ] *= invSY;

                _m1.elements[ 8 ] *= invSZ;
                _m1.elements[ 9 ] *= invSZ;
                _m1.elements[ 10 ] *= invSZ;

                quaternion.setFromRotationMatrix( _m1 );

                scale.x = sx;
                scale.y = sy;
                scale.z = sz;

                return this;

        }

        makePerspective( left, right, top, bottom, near, far ) {

                if ( far === undefined ) {

                        console.warn( 'THREE.Matrix4: .makePerspective() has been redefined and has a new signature. Please check the docs.' );

                }

                const te = this.elements;
                const x = 2 * near / ( right - left );
                const y = 2 * near / ( top - bottom );

                const a = ( right + left ) / ( right - left );
                const b = ( top + bottom ) / ( top - bottom );
                const c = - ( far + near ) / ( far - near );
                const d = - 2 * far * near / ( far - near );

                te[ 0 ] = x;    te[ 4 ] = 0;    te[ 8 ] = a;    te[ 12 ] = 0;
                te[ 1 ] = 0;    te[ 5 ] = y;    te[ 9 ] = b;    te[ 13 ] = 0;
                te[ 2 ] = 0;    te[ 6 ] = 0;    te[ 10 ] = c;   te[ 14 ] = d;
                te[ 3 ] = 0;    te[ 7 ] = 0;    te[ 11 ] = - 1; te[ 15 ] = 0;

                return this;

        }

        makeOrthographic( left, right, top, bottom, near, far ) {

                const te = this.elements;
                const w = 1.0 / ( right - left );
                const h = 1.0 / ( top - bottom );
                const p = 1.0 / ( far - near );

                const x = ( right + left ) * w;
                const y = ( top + bottom ) * h;
                const z = ( far + near ) * p;

                te[ 0 ] = 2 * w;        te[ 4 ] = 0;    te[ 8 ] = 0;    te[ 12 ] = - x;
                te[ 1 ] = 0;    te[ 5 ] = 2 * h;        te[ 9 ] = 0;    te[ 13 ] = - y;
                te[ 2 ] = 0;    te[ 6 ] = 0;    te[ 10 ] = - 2 * p;     te[ 14 ] = - z;
                te[ 3 ] = 0;    te[ 7 ] = 0;    te[ 11 ] = 0;   te[ 15 ] = 1;

                return this;

        }

        equals( matrix ) {

                const te = this.elements;
                const me = matrix.elements;

                for ( let i = 0; i < 16; i ++ ) {

                        if ( te[ i ] !== me[ i ] ) return false;

                }

                return true;

        }

        fromArray( array, offset = 0 ) {

                for ( let i = 0; i < 16; i ++ ) {

                        this.elements[ i ] = array[ i + offset ];

                }

                return this;

        }

        toArray( array = [], offset = 0 ) {

                const te = this.elements;

                array[ offset ] = te[ 0 ];
                array[ offset + 1 ] = te[ 1 ];
                array[ offset + 2 ] = te[ 2 ];
                array[ offset + 3 ] = te[ 3 ];

                array[ offset + 4 ] = te[ 4 ];
                array[ offset + 5 ] = te[ 5 ];
                array[ offset + 6 ] = te[ 6 ];
                array[ offset + 7 ] = te[ 7 ];

                array[ offset + 8 ] = te[ 8 ];
                array[ offset + 9 ] = te[ 9 ];
                array[ offset + 10 ] = te[ 10 ];
                array[ offset + 11 ] = te[ 11 ];

                array[ offset + 12 ] = te[ 12 ];
                array[ offset + 13 ] = te[ 13 ];
                array[ offset + 14 ] = te[ 14 ];
                array[ offset + 15 ] = te[ 15 ];

                return array;

        }

}

const _v1$1 = /*@__PURE__*/ new Vector3();
const _m1 = /*@__PURE__*/ new Matrix4();
const _zero = /*@__PURE__*/ new Vector3( 0, 0, 0 );
const _one = /*@__PURE__*/ new Vector3( 1, 1, 1 );
const _x = /*@__PURE__*/ new Vector3();
const _y = /*@__PURE__*/ new Vector3();
const _z = /*@__PURE__*/ new Vector3();

class Euler {

        constructor( x = 0, y = 0, z = 0, order = Euler.DefaultOrder ) {

                Object.defineProperty( this, 'isEuler', { value: true } );

                this._x = x;
                this._y = y;
                this._z = z;
                this._order = order;

        }

        get x() {

                return this._x;

        }

        set x( value ) {

                this._x = value;
                this._onChangeCallback();

        }

        get y() {

                return this._y;

        }

        set y( value ) {

                this._y = value;
                this._onChangeCallback();

        }

        get z() {

                return this._z;

        }

        set z( value ) {

                this._z = value;
                this._onChangeCallback();

        }

        get order() {

                return this._order;

        }

        set order( value ) {

                this._order = value;
                this._onChangeCallback();

        }

        set( x, y, z, order ) {

                this._x = x;
                this._y = y;
                this._z = z;
                this._order = order || this._order;

                this._onChangeCallback();

                return this;

        }

        clone() {

                return new this.constructor( this._x, this._y, this._z, this._order );

        }

        copy( euler ) {

                this._x = euler._x;
                this._y = euler._y;
                this._z = euler._z;
                this._order = euler._order;

                this._onChangeCallback();

                return this;

        }

        setFromRotationMatrix( m, order, update ) {

                const clamp = MathUtils.clamp;

                // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

                const te = m.elements;
                const m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ];
                const m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ];
                const m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ];

                order = order || this._order;

                switch ( order ) {

                        case 'XYZ':

                                this._y = Math.asin( clamp( m13, - 1, 1 ) );

                                if ( Math.abs( m13 ) < 0.9999999 ) {

                                        this._x = Math.atan2( - m23, m33 );
                                        this._z = Math.atan2( - m12, m11 );

                                } else {

                                        this._x = Math.atan2( m32, m22 );
                                        this._z = 0;

                                }

                                break;

                        case 'YXZ':

                                this._x = Math.asin( - clamp( m23, - 1, 1 ) );

                                if ( Math.abs( m23 ) < 0.9999999 ) {

                                        this._y = Math.atan2( m13, m33 );
                                        this._z = Math.atan2( m21, m22 );

                                } else {

                                        this._y = Math.atan2( - m31, m11 );
                                        this._z = 0;

                                }

                                break;

                        case 'ZXY':

                                this._x = Math.asin( clamp( m32, - 1, 1 ) );

                                if ( Math.abs( m32 ) < 0.9999999 ) {

                                        this._y = Math.atan2( - m31, m33 );
                                        this._z = Math.atan2( - m12, m22 );

                                } else {

                                        this._y = 0;
                                        this._z = Math.atan2( m21, m11 );

                                }

                                break;

                        case 'ZYX':

                                this._y = Math.asin( - clamp( m31, - 1, 1 ) );

                                if ( Math.abs( m31 ) < 0.9999999 ) {

                                        this._x = Math.atan2( m32, m33 );
                                        this._z = Math.atan2( m21, m11 );

                                } else {

                                        this._x = 0;
                                        this._z = Math.atan2( - m12, m22 );

                                }

                                break;

                        case 'YZX':

                                this._z = Math.asin( clamp( m21, - 1, 1 ) );

                                if ( Math.abs( m21 ) < 0.9999999 ) {

                                        this._x = Math.atan2( - m23, m22 );
                                        this._y = Math.atan2( - m31, m11 );

                                } else {

                                        this._x = 0;
                                        this._y = Math.atan2( m13, m33 );

                                }

                                break;

                        case 'XZY':

                                this._z = Math.asin( - clamp( m12, - 1, 1 ) );

                                if ( Math.abs( m12 ) < 0.9999999 ) {

                                        this._x = Math.atan2( m32, m22 );
                                        this._y = Math.atan2( m13, m11 );

                                } else {

                                        this._x = Math.atan2( - m23, m33 );
                                        this._y = 0;

                                }

                                break;

                        default:

                                console.warn( 'THREE.Euler: .setFromRotationMatrix() encountered an unknown order: ' + order );

                }

                this._order = order;

                if ( update !== false ) this._onChangeCallback();

                return this;

        }

        setFromQuaternion( q, order, update ) {

                _matrix.makeRotationFromQuaternion( q );

                return this.setFromRotationMatrix( _matrix, order, update );

        }

        setFromVector3( v, order ) {

                return this.set( v.x, v.y, v.z, order || this._order );

        }

        reorder( newOrder ) {

                // WARNING: this discards revolution information -bhouston

                _quaternion$1.setFromEuler( this );

                return this.setFromQuaternion( _quaternion$1, newOrder );

        }

        equals( euler ) {

                return ( euler._x === this._x ) && ( euler._y === this._y ) && ( euler._z === this._z ) && ( euler._order === this._order );

        }

        fromArray( array ) {

                this._x = array[ 0 ];
                this._y = array[ 1 ];
                this._z = array[ 2 ];
                if ( array[ 3 ] !== undefined ) this._order = array[ 3 ];

                this._onChangeCallback();

                return this;

        }

        toArray( array = [], offset = 0 ) {

                array[ offset ] = this._x;
                array[ offset + 1 ] = this._y;
                array[ offset + 2 ] = this._z;
                array[ offset + 3 ] = this._order;

                return array;

        }

        toVector3( optionalResult ) {

                if ( optionalResult ) {

                        return optionalResult.set( this._x, this._y, this._z );

                } else {

                        return new Vector3( this._x, this._y, this._z );

                }

        }

        _onChange( callback ) {

                this._onChangeCallback = callback;

                return this;

        }

        _onChangeCallback() {}

}

Euler.DefaultOrder = 'XYZ';
Euler.RotationOrders = [ 'XYZ', 'YZX', 'ZXY', 'XZY', 'YXZ', 'ZYX' ];

const _matrix = /*@__PURE__*/ new Matrix4();
const _quaternion$1 = /*@__PURE__*/ new Quaternion();

class Layers {

        constructor() {

                this.mask = 1 | 0;

        }

        set( channel ) {

                this.mask = 1 << channel | 0;

        }

        enable( channel ) {

                this.mask |= 1 << channel | 0;

        }

        enableAll() {

                this.mask = 0xffffffff | 0;

        }

        toggle( channel ) {

                this.mask ^= 1 << channel | 0;

        }

        disable( channel ) {

                this.mask &= ~ ( 1 << channel | 0 );

        }

        disableAll() {

                this.mask = 0;

        }

        test( layers ) {

                return ( this.mask & layers.mask ) !== 0;

        }

}

let _object3DId = 0;

const _v1$2 = new Vector3();
const _q1 = new Quaternion();
const _m1$1 = new Matrix4();
const _target = new Vector3();

const _position = new Vector3();
const _scale = new Vector3();
const _quaternion$2 = new Quaternion();

const _xAxis = new Vector3( 1, 0, 0 );
const _yAxis = new Vector3( 0, 1, 0 );
const _zAxis = new Vector3( 0, 0, 1 );

const _addedEvent = { type: 'added' };
const _removedEvent = { type: 'removed' };

function Object3D() {

        Object.defineProperty( this, 'id', { value: _object3DId ++ } );

        this.uuid = MathUtils.generateUUID();

        this.name = '';
        this.type = 'Object3D';

        this.parent = null;
        this.children = [];

        this.up = Object3D.DefaultUp.clone();

        const position = new Vector3();
        const rotation = new Euler();
        const quaternion = new Quaternion();
        const scale = new Vector3( 1, 1, 1 );

        function onRotationChange() {

                quaternion.setFromEuler( rotation, false );

        }

        function onQuaternionChange() {

                rotation.setFromQuaternion( quaternion, undefined, false );

        }

        rotation._onChange( onRotationChange );
        quaternion._onChange( onQuaternionChange );

        Object.defineProperties( this, {
                position: {
                        configurable: true,
                        enumerable: true,
                        value: position
                },
                rotation: {
                        configurable: true,
                        enumerable: true,
                        value: rotation
                },
                quaternion: {
                        configurable: true,
                        enumerable: true,
                        value: quaternion
                },
                scale: {
                        configurable: true,
                        enumerable: true,
                        value: scale
                },
                modelViewMatrix: {
                        value: new Matrix4()
                },
                normalMatrix: {
                        value: new Matrix3()
                }
        } );

        this.matrix = new Matrix4();
        this.matrixWorld = new Matrix4();

        this.matrixAutoUpdate = Object3D.DefaultMatrixAutoUpdate;
        this.matrixWorldNeedsUpdate = false;

        this.layers = new Layers();
        this.visible = true;

        this.castShadow = false;
        this.receiveShadow = false;

        this.frustumCulled = true;
        this.renderOrder = 0;

        this.animations = [];

        this.userData = {};

}

Object3D.DefaultUp = new Vector3( 0, 1, 0 );
Object3D.DefaultMatrixAutoUpdate = true;

Object3D.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

        constructor: Object3D,

        isObject3D: true,

        onBeforeRender: function () {},
        onAfterRender: function () {},

        applyMatrix4: function ( matrix ) {

                if ( this.matrixAutoUpdate ) this.updateMatrix();

                this.matrix.premultiply( matrix );

                this.matrix.decompose( this.position, this.quaternion, this.scale );

        },

        applyQuaternion: function ( q ) {

                this.quaternion.premultiply( q );

                return this;

        },

        setRotationFromAxisAngle: function ( axis, angle ) {

                // assumes axis is normalized

                this.quaternion.setFromAxisAngle( axis, angle );

        },

        setRotationFromEuler: function ( euler ) {

                this.quaternion.setFromEuler( euler, true );

        },

        setRotationFromMatrix: function ( m ) {

                // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

                this.quaternion.setFromRotationMatrix( m );

        },

        setRotationFromQuaternion: function ( q ) {

                // assumes q is normalized

                this.quaternion.copy( q );

        },

        rotateOnAxis: function ( axis, angle ) {

                // rotate object on axis in object space
                // axis is assumed to be normalized

                _q1.setFromAxisAngle( axis, angle );

                this.quaternion.multiply( _q1 );

                return this;

        },

        rotateOnWorldAxis: function ( axis, angle ) {

                // rotate object on axis in world space
                // axis is assumed to be normalized
                // method assumes no rotated parent

                _q1.setFromAxisAngle( axis, angle );

                this.quaternion.premultiply( _q1 );

                return this;

        },

        rotateX: function ( angle ) {

                return this.rotateOnAxis( _xAxis, angle );

        },

        rotateY: function ( angle ) {

                return this.rotateOnAxis( _yAxis, angle );

        },

        rotateZ: function ( angle ) {

                return this.rotateOnAxis( _zAxis, angle );

        },

        translateOnAxis: function ( axis, distance ) {

                // translate object by distance along axis in object space
                // axis is assumed to be normalized

                _v1$2.copy( axis ).applyQuaternion( this.quaternion );

                this.position.add( _v1$2.multiplyScalar( distance ) );

                return this;

        },

        translateX: function ( distance ) {

                return this.translateOnAxis( _xAxis, distance );

        },

        translateY: function ( distance ) {

                return this.translateOnAxis( _yAxis, distance );

        },

        translateZ: function ( distance ) {

                return this.translateOnAxis( _zAxis, distance );

        },

        localToWorld: function ( vector ) {

                return vector.applyMatrix4( this.matrixWorld );

        },

        worldToLocal: function ( vector ) {

                return vector.applyMatrix4( _m1$1.copy( this.matrixWorld ).invert() );

        },

        lookAt: function ( x, y, z ) {

                // This method does not support objects having non-uniformly-scaled parent(s)

                if ( x.isVector3 ) {

                        _target.copy( x );

                } else {

                        _target.set( x, y, z );

                }

                const parent = this.parent;

                this.updateWorldMatrix( true, false );

                _position.setFromMatrixPosition( this.matrixWorld );

                if ( this.isCamera || this.isLight ) {

                        _m1$1.lookAt( _position, _target, this.up );

                } else {

                        _m1$1.lookAt( _target, _position, this.up );

                }

                this.quaternion.setFromRotationMatrix( _m1$1 );

                if ( parent ) {

                        _m1$1.extractRotation( parent.matrixWorld );
                        _q1.setFromRotationMatrix( _m1$1 );
                        this.quaternion.premultiply( _q1.invert() );

                }

        },

        add: function ( object ) {

                if ( arguments.length > 1 ) {

                        for ( let i = 0; i < arguments.length; i ++ ) {

                                this.add( arguments[ i ] );

                        }

                        return this;

                }

                if ( object === this ) {

                        console.error( "THREE.Object3D.add: object can't be added as a child of itself.", object );
                        return this;

                }

                if ( ( object && object.isObject3D ) ) {

                        if ( object.parent !== null ) {

                                object.parent.remove( object );

                        }

                        object.parent = this;
                        this.children.push( object );

                        object.dispatchEvent( _addedEvent );

                } else {

                        console.error( "THREE.Object3D.add: object not an instance of THREE.Object3D.", object );

                }

                return this;

        },

        remove: function ( object ) {

                if ( arguments.length > 1 ) {

                        for ( let i = 0; i < arguments.length; i ++ ) {

                                this.remove( arguments[ i ] );

                        }

                        return this;

                }

                const index = this.children.indexOf( object );

                if ( index !== - 1 ) {

                        object.parent = null;
                        this.children.splice( index, 1 );

                        object.dispatchEvent( _removedEvent );

                }

                return this;

        },

        clear: function () {

                for ( let i = 0; i < this.children.length; i ++ ) {

                        const object = this.children[ i ];

                        object.parent = null;

                        object.dispatchEvent( _removedEvent );

                }

                this.children.length = 0;

                return this;


        },

        attach: function ( object ) {

                // adds object as a child of this, while maintaining the object's world transform

                this.updateWorldMatrix( true, false );

                _m1$1.copy( this.matrixWorld ).invert();

                if ( object.parent !== null ) {

                        object.parent.updateWorldMatrix( true, false );

                        _m1$1.multiply( object.parent.matrixWorld );

                }

                object.applyMatrix4( _m1$1 );

                object.updateWorldMatrix( false, false );

                this.add( object );

                return this;

        },

        getObjectById: function ( id ) {

                return this.getObjectByProperty( 'id', id );

        },

        getObjectByName: function ( name ) {

                return this.getObjectByProperty( 'name', name );

        },

        getObjectByProperty: function ( name, value ) {

                if ( this[ name ] === value ) return this;

                for ( let i = 0, l = this.children.length; i < l; i ++ ) {

                        const child = this.children[ i ];
                        const object = child.getObjectByProperty( name, value );

                        if ( object !== undefined ) {

                                return object;

                        }

                }

                return undefined;

        },

        getWorldPosition: function ( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Object3D: .getWorldPosition() target is now required' );
                        target = new Vector3();

                }

                this.updateWorldMatrix( true, false );

                return target.setFromMatrixPosition( this.matrixWorld );

        },

        getWorldQuaternion: function ( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Object3D: .getWorldQuaternion() target is now required' );
                        target = new Quaternion();

                }

                this.updateWorldMatrix( true, false );

                this.matrixWorld.decompose( _position, target, _scale );

                return target;

        },

        getWorldScale: function ( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Object3D: .getWorldScale() target is now required' );
                        target = new Vector3();

                }

                this.updateWorldMatrix( true, false );

                this.matrixWorld.decompose( _position, _quaternion$2, target );

                return target;

        },

        getWorldDirection: function ( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Object3D: .getWorldDirection() target is now required' );
                        target = new Vector3();

                }

                this.updateWorldMatrix( true, false );

                const e = this.matrixWorld.elements;

                return target.set( e[ 8 ], e[ 9 ], e[ 10 ] ).normalize();

        },

        raycast: function () {},

        traverse: function ( callback ) {

                callback( this );

                const children = this.children;

                for ( let i = 0, l = children.length; i < l; i ++ ) {

                        children[ i ].traverse( callback );

                }

        },

        traverseVisible: function ( callback ) {

                if ( this.visible === false ) return;

                callback( this );

                const children = this.children;

                for ( let i = 0, l = children.length; i < l; i ++ ) {

                        children[ i ].traverseVisible( callback );

                }

        },

        traverseAncestors: function ( callback ) {

                const parent = this.parent;

                if ( parent !== null ) {

                        callback( parent );

                        parent.traverseAncestors( callback );

                }

        },

        updateMatrix: function () {

                this.matrix.compose( this.position, this.quaternion, this.scale );

                this.matrixWorldNeedsUpdate = true;

        },

        updateMatrixWorld: function ( force ) {

                if ( this.matrixAutoUpdate ) this.updateMatrix();

                if ( this.matrixWorldNeedsUpdate || force ) {

                        if ( this.parent === null ) {

                                this.matrixWorld.copy( this.matrix );

                        } else {

                                this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );

                        }

                        this.matrixWorldNeedsUpdate = false;

                        force = true;

                }

                // update children

                const children = this.children;

                for ( let i = 0, l = children.length; i < l; i ++ ) {

                        children[ i ].updateMatrixWorld( force );

                }

        },

        updateWorldMatrix: function ( updateParents, updateChildren ) {

                const parent = this.parent;

                if ( updateParents === true && parent !== null ) {

                        parent.updateWorldMatrix( true, false );

                }

                if ( this.matrixAutoUpdate ) this.updateMatrix();

                if ( this.parent === null ) {

                        this.matrixWorld.copy( this.matrix );

                } else {

                        this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );

                }

                // update children

                if ( updateChildren === true ) {

                        const children = this.children;

                        for ( let i = 0, l = children.length; i < l; i ++ ) {

                                children[ i ].updateWorldMatrix( false, true );

                        }

                }

        },

        toJSON: function ( meta ) {

                // meta is a string when called from JSON.stringify
                const isRootObject = ( meta === undefined || typeof meta === 'string' );

                const output = {};

                // meta is a hash used to collect geometries, materials.
                // not providing it implies that this is the root object
                // being serialized.
                if ( isRootObject ) {

                        // initialize meta obj
                        meta = {
                                geometries: {},
                                materials: {},
                                textures: {},
                                images: {},
                                shapes: {},
                                skeletons: {},
                                animations: {}
                        };

                        output.metadata = {
                                version: 4.5,
                                type: 'Object',
                                generator: 'Object3D.toJSON'
                        };

                }

                // standard Object3D serialization

                const object = {};

                object.uuid = this.uuid;
                object.type = this.type;

                if ( this.name !== '' ) object.name = this.name;
                if ( this.castShadow === true ) object.castShadow = true;
                if ( this.receiveShadow === true ) object.receiveShadow = true;
                if ( this.visible === false ) object.visible = false;
                if ( this.frustumCulled === false ) object.frustumCulled = false;
                if ( this.renderOrder !== 0 ) object.renderOrder = this.renderOrder;
                if ( JSON.stringify( this.userData ) !== '{}' ) object.userData = this.userData;

                object.layers = this.layers.mask;
                object.matrix = this.matrix.toArray();

                if ( this.matrixAutoUpdate === false ) object.matrixAutoUpdate = false;

                // object specific properties

                if ( this.isInstancedMesh ) {

                        object.type = 'InstancedMesh';
                        object.count = this.count;
                        object.instanceMatrix = this.instanceMatrix.toJSON();

                }

                //

                function serialize( library, element ) {

                        if ( library[ element.uuid ] === undefined ) {

                                library[ element.uuid ] = element.toJSON( meta );

                        }

                        return element.uuid;

                }

                if ( this.isMesh || this.isLine || this.isPoints ) {

                        object.geometry = serialize( meta.geometries, this.geometry );

                        const parameters = this.geometry.parameters;

                        if ( parameters !== undefined && parameters.shapes !== undefined ) {

                                const shapes = parameters.shapes;

                                if ( Array.isArray( shapes ) ) {

                                        for ( let i = 0, l = shapes.length; i < l; i ++ ) {

                                                const shape = shapes[ i ];

                                                serialize( meta.shapes, shape );

                                        }

                                } else {

                                        serialize( meta.shapes, shapes );

                                }

                        }

                }

                if ( this.isSkinnedMesh ) {

                        object.bindMode = this.bindMode;
                        object.bindMatrix = this.bindMatrix.toArray();

                        if ( this.skeleton !== undefined ) {

                                serialize( meta.skeletons, this.skeleton );

                                object.skeleton = this.skeleton.uuid;

                        }

                }

                if ( this.material !== undefined ) {

                        if ( Array.isArray( this.material ) ) {

                                const uuids = [];

                                for ( let i = 0, l = this.material.length; i < l; i ++ ) {

                                        uuids.push( serialize( meta.materials, this.material[ i ] ) );

                                }

                                object.material = uuids;

                        } else {

                                object.material = serialize( meta.materials, this.material );

                        }

                }

                //

                if ( this.children.length > 0 ) {

                        object.children = [];

                        for ( let i = 0; i < this.children.length; i ++ ) {

                                object.children.push( this.children[ i ].toJSON( meta ).object );

                        }

                }

                //

                if ( this.animations.length > 0 ) {

                        object.animations = [];

                        for ( let i = 0; i < this.animations.length; i ++ ) {

                                const animation = this.animations[ i ];

                                object.animations.push( serialize( meta.animations, animation ) );

                        }

                }

                if ( isRootObject ) {

                        const geometries = extractFromCache( meta.geometries );
                        const materials = extractFromCache( meta.materials );
                        const textures = extractFromCache( meta.textures );
                        const images = extractFromCache( meta.images );
                        const shapes = extractFromCache( meta.shapes );
                        const skeletons = extractFromCache( meta.skeletons );
                        const animations = extractFromCache( meta.animations );

                        if ( geometries.length > 0 ) output.geometries = geometries;
                        if ( materials.length > 0 ) output.materials = materials;
                        if ( textures.length > 0 ) output.textures = textures;
                        if ( images.length > 0 ) output.images = images;
                        if ( shapes.length > 0 ) output.shapes = shapes;
                        if ( skeletons.length > 0 ) output.skeletons = skeletons;
                        if ( animations.length > 0 ) output.animations = animations;

                }

                output.object = object;

                return output;

                // extract data from the cache hash
                // remove metadata on each item
                // and return as array
                function extractFromCache( cache ) {

                        const values = [];
                        for ( const key in cache ) {

                                const data = cache[ key ];
                                delete data.metadata;
                                values.push( data );

                        }

                        return values;

                }

        },

        clone: function ( recursive ) {

                return new this.constructor().copy( this, recursive );

        },

        copy: function ( source, recursive = true ) {

                this.name = source.name;

                this.up.copy( source.up );

                this.position.copy( source.position );
                this.rotation.order = source.rotation.order;
                this.quaternion.copy( source.quaternion );
                this.scale.copy( source.scale );

                this.matrix.copy( source.matrix );
                this.matrixWorld.copy( source.matrixWorld );

                this.matrixAutoUpdate = source.matrixAutoUpdate;
                this.matrixWorldNeedsUpdate = source.matrixWorldNeedsUpdate;

                this.layers.mask = source.layers.mask;
                this.visible = source.visible;

                this.castShadow = source.castShadow;
                this.receiveShadow = source.receiveShadow;

                this.frustumCulled = source.frustumCulled;
                this.renderOrder = source.renderOrder;

                this.userData = JSON.parse( JSON.stringify( source.userData ) );

                if ( recursive === true ) {

                        for ( let i = 0; i < source.children.length; i ++ ) {

                                const child = source.children[ i ];
                                this.add( child.clone() );

                        }

                }

                return this;

        }

} );

const _vector1 = /*@__PURE__*/ new Vector3();
const _vector2 = /*@__PURE__*/ new Vector3();
const _normalMatrix = /*@__PURE__*/ new Matrix3();

class Plane {

        constructor( normal, constant ) {

                Object.defineProperty( this, 'isPlane', { value: true } );

                // normal is assumed to be normalized

                this.normal = ( normal !== undefined ) ? normal : new Vector3( 1, 0, 0 );
                this.constant = ( constant !== undefined ) ? constant : 0;

        }

        set( normal, constant ) {

                this.normal.copy( normal );
                this.constant = constant;

                return this;

        }

        setComponents( x, y, z, w ) {

                this.normal.set( x, y, z );
                this.constant = w;

                return this;

        }

        setFromNormalAndCoplanarPoint( normal, point ) {

                this.normal.copy( normal );
                this.constant = - point.dot( this.normal );

                return this;

        }

        setFromCoplanarPoints( a, b, c ) {

                const normal = _vector1.subVectors( c, b ).cross( _vector2.subVectors( a, b ) ).normalize();

                // Q: should an error be thrown if normal is zero (e.g. degenerate plane)?

                this.setFromNormalAndCoplanarPoint( normal, a );

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( plane ) {

                this.normal.copy( plane.normal );
                this.constant = plane.constant;

                return this;

        }

        normalize() {

                // Note: will lead to a divide by zero if the plane is invalid.

                const inverseNormalLength = 1.0 / this.normal.length();
                this.normal.multiplyScalar( inverseNormalLength );
                this.constant *= inverseNormalLength;

                return this;

        }

        negate() {

                this.constant *= - 1;
                this.normal.negate();

                return this;

        }

        distanceToPoint( point ) {

                return this.normal.dot( point ) + this.constant;

        }

        distanceToSphere( sphere ) {

                return this.distanceToPoint( sphere.center ) - sphere.radius;

        }

        projectPoint( point, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Plane: .projectPoint() target is now required' );
                        target = new Vector3();

                }

                return target.copy( this.normal ).multiplyScalar( - this.distanceToPoint( point ) ).add( point );

        }

        intersectLine( line, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Plane: .intersectLine() target is now required' );
                        target = new Vector3();

                }

                const direction = line.delta( _vector1 );

                const denominator = this.normal.dot( direction );

                if ( denominator === 0 ) {

                        // line is coplanar, return origin
                        if ( this.distanceToPoint( line.start ) === 0 ) {

                                return target.copy( line.start );

                        }

                        // Unsure if this is the correct method to handle this case.
                        return undefined;

                }

                const t = - ( line.start.dot( this.normal ) + this.constant ) / denominator;

                if ( t < 0 || t > 1 ) {

                        return undefined;

                }

                return target.copy( direction ).multiplyScalar( t ).add( line.start );

        }

        intersectsLine( line ) {

                // Note: this tests if a line intersects the plane, not whether it (or its end-points) are coplanar with it.

                const startSign = this.distanceToPoint( line.start );
                const endSign = this.distanceToPoint( line.end );

                return ( startSign < 0 && endSign > 0 ) || ( endSign < 0 && startSign > 0 );

        }

        intersectsBox( box ) {

                return box.intersectsPlane( this );

        }

        intersectsSphere( sphere ) {

                return sphere.intersectsPlane( this );

        }

        coplanarPoint( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Plane: .coplanarPoint() target is now required' );
                        target = new Vector3();

                }

                return target.copy( this.normal ).multiplyScalar( - this.constant );

        }

        applyMatrix4( matrix, optionalNormalMatrix ) {

                const normalMatrix = optionalNormalMatrix || _normalMatrix.getNormalMatrix( matrix );

                const referencePoint = this.coplanarPoint( _vector1 ).applyMatrix4( matrix );

                const normal = this.normal.applyMatrix3( normalMatrix ).normalize();

                this.constant = - referencePoint.dot( normal );

                return this;

        }

        translate( offset ) {

                this.constant -= offset.dot( this.normal );

                return this;

        }

        equals( plane ) {

                return plane.normal.equals( this.normal ) && ( plane.constant === this.constant );

        }

}

const _v0$1 = /*@__PURE__*/ new Vector3();
const _v1$3 = /*@__PURE__*/ new Vector3();
const _v2$1 = /*@__PURE__*/ new Vector3();
const _v3 = /*@__PURE__*/ new Vector3();

const _vab = /*@__PURE__*/ new Vector3();
const _vac = /*@__PURE__*/ new Vector3();
const _vbc = /*@__PURE__*/ new Vector3();
const _vap = /*@__PURE__*/ new Vector3();
const _vbp = /*@__PURE__*/ new Vector3();
const _vcp = /*@__PURE__*/ new Vector3();

class Triangle {

        constructor( a, b, c ) {

                this.a = ( a !== undefined ) ? a : new Vector3();
                this.b = ( b !== undefined ) ? b : new Vector3();
                this.c = ( c !== undefined ) ? c : new Vector3();

        }

        static getNormal( a, b, c, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Triangle: .getNormal() target is now required' );
                        target = new Vector3();

                }

                target.subVectors( c, b );
                _v0$1.subVectors( a, b );
                target.cross( _v0$1 );

                const targetLengthSq = target.lengthSq();
                if ( targetLengthSq > 0 ) {

                        return target.multiplyScalar( 1 / Math.sqrt( targetLengthSq ) );

                }

                return target.set( 0, 0, 0 );

        }

        // static/instance method to calculate barycentric coordinates
        // based on: http://www.blackpawn.com/texts/pointinpoly/default.html
        static getBarycoord( point, a, b, c, target ) {

                _v0$1.subVectors( c, a );
                _v1$3.subVectors( b, a );
                _v2$1.subVectors( point, a );

                const dot00 = _v0$1.dot( _v0$1 );
                const dot01 = _v0$1.dot( _v1$3 );
                const dot02 = _v0$1.dot( _v2$1 );
                const dot11 = _v1$3.dot( _v1$3 );
                const dot12 = _v1$3.dot( _v2$1 );

                const denom = ( dot00 * dot11 - dot01 * dot01 );

                if ( target === undefined ) {

                        console.warn( 'THREE.Triangle: .getBarycoord() target is now required' );
                        target = new Vector3();

                }

                // collinear or singular triangle
                if ( denom === 0 ) {

                        // arbitrary location outside of triangle?
                        // not sure if this is the best idea, maybe should be returning undefined
                        return target.set( - 2, - 1, - 1 );

                }

                const invDenom = 1 / denom;
                const u = ( dot11 * dot02 - dot01 * dot12 ) * invDenom;
                const v = ( dot00 * dot12 - dot01 * dot02 ) * invDenom;

                // barycentric coordinates must always sum to 1
                return target.set( 1 - u - v, v, u );

        }

        static containsPoint( point, a, b, c ) {

                this.getBarycoord( point, a, b, c, _v3 );

                return ( _v3.x >= 0 ) && ( _v3.y >= 0 ) && ( ( _v3.x + _v3.y ) <= 1 );

        }

        static getUV( point, p1, p2, p3, uv1, uv2, uv3, target ) {

                this.getBarycoord( point, p1, p2, p3, _v3 );

                target.set( 0, 0 );
                target.addScaledVector( uv1, _v3.x );
                target.addScaledVector( uv2, _v3.y );
                target.addScaledVector( uv3, _v3.z );

                return target;

        }

        static isFrontFacing( a, b, c, direction ) {

                _v0$1.subVectors( c, b );
                _v1$3.subVectors( a, b );

                // strictly front facing
                return ( _v0$1.cross( _v1$3 ).dot( direction ) < 0 ) ? true : false;

        }

        set( a, b, c ) {

                this.a.copy( a );
                this.b.copy( b );
                this.c.copy( c );

                return this;

        }

        setFromPointsAndIndices( points, i0, i1, i2 ) {

                this.a.copy( points[ i0 ] );
                this.b.copy( points[ i1 ] );
                this.c.copy( points[ i2 ] );

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( triangle ) {

                this.a.copy( triangle.a );
                this.b.copy( triangle.b );
                this.c.copy( triangle.c );

                return this;

        }

        getArea() {

                _v0$1.subVectors( this.c, this.b );
                _v1$3.subVectors( this.a, this.b );

                return _v0$1.cross( _v1$3 ).length() * 0.5;

        }

        getMidpoint( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Triangle: .getMidpoint() target is now required' );
                        target = new Vector3();

                }

                return target.addVectors( this.a, this.b ).add( this.c ).multiplyScalar( 1 / 3 );

        }

        getNormal( target ) {

                return Triangle.getNormal( this.a, this.b, this.c, target );

        }

        getPlane( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Triangle: .getPlane() target is now required' );
                        target = new Plane();

                }

                return target.setFromCoplanarPoints( this.a, this.b, this.c );

        }

        getBarycoord( point, target ) {

                return Triangle.getBarycoord( point, this.a, this.b, this.c, target );

        }

        getUV( point, uv1, uv2, uv3, target ) {

                return Triangle.getUV( point, this.a, this.b, this.c, uv1, uv2, uv3, target );

        }

        containsPoint( point ) {

                return Triangle.containsPoint( point, this.a, this.b, this.c );

        }

        isFrontFacing( direction ) {

                return Triangle.isFrontFacing( this.a, this.b, this.c, direction );

        }

        intersectsBox( box ) {

                return box.intersectsTriangle( this );

        }

        closestPointToPoint( p, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Triangle: .closestPointToPoint() target is now required' );
                        target = new Vector3();

                }

                const a = this.a, b = this.b, c = this.c;
                let v, w;

                // algorithm thanks to Real-Time Collision Detection by Christer Ericson,
                // published by Morgan Kaufmann Publishers, (c) 2005 Elsevier Inc.,
                // under the accompanying license; see chapter 5.1.5 for detailed explanation.
                // basically, we're distinguishing which of the voronoi regions of the triangle
                // the point lies in with the minimum amount of redundant computation.

                _vab.subVectors( b, a );
                _vac.subVectors( c, a );
                _vap.subVectors( p, a );
                const d1 = _vab.dot( _vap );
                const d2 = _vac.dot( _vap );
                if ( d1 <= 0 && d2 <= 0 ) {

                        // vertex region of A; barycentric coords (1, 0, 0)
                        return target.copy( a );

                }

                _vbp.subVectors( p, b );
                const d3 = _vab.dot( _vbp );
                const d4 = _vac.dot( _vbp );
                if ( d3 >= 0 && d4 <= d3 ) {

                        // vertex region of B; barycentric coords (0, 1, 0)
                        return target.copy( b );

                }

                const vc = d1 * d4 - d3 * d2;
                if ( vc <= 0 && d1 >= 0 && d3 <= 0 ) {

                        v = d1 / ( d1 - d3 );
                        // edge region of AB; barycentric coords (1-v, v, 0)
                        return target.copy( a ).addScaledVector( _vab, v );

                }

                _vcp.subVectors( p, c );
                const d5 = _vab.dot( _vcp );
                const d6 = _vac.dot( _vcp );
                if ( d6 >= 0 && d5 <= d6 ) {

                        // vertex region of C; barycentric coords (0, 0, 1)
                        return target.copy( c );

                }

                const vb = d5 * d2 - d1 * d6;
                if ( vb <= 0 && d2 >= 0 && d6 <= 0 ) {

                        w = d2 / ( d2 - d6 );
                        // edge region of AC; barycentric coords (1-w, 0, w)
                        return target.copy( a ).addScaledVector( _vac, w );

                }

                const va = d3 * d6 - d5 * d4;
                if ( va <= 0 && ( d4 - d3 ) >= 0 && ( d5 - d6 ) >= 0 ) {

                        _vbc.subVectors( c, b );
                        w = ( d4 - d3 ) / ( ( d4 - d3 ) + ( d5 - d6 ) );
                        // edge region of BC; barycentric coords (0, 1-w, w)
                        return target.copy( b ).addScaledVector( _vbc, w ); // edge region of BC

                }

                // face region
                const denom = 1 / ( va + vb + vc );
                // u = va * denom
                v = vb * denom;
                w = vc * denom;

                return target.copy( a ).addScaledVector( _vab, v ).addScaledVector( _vac, w );

        }

        equals( triangle ) {

                return triangle.a.equals( this.a ) && triangle.b.equals( this.b ) && triangle.c.equals( this.c );

        }

}

const _colorKeywords = { 'aliceblue': 0xF0F8FF, 'antiquewhite': 0xFAEBD7, 'aqua': 0x00FFFF, 'aquamarine': 0x7FFFD4, 'azure': 0xF0FFFF,
        'beige': 0xF5F5DC, 'bisque': 0xFFE4C4, 'black': 0x000000, 'blanchedalmond': 0xFFEBCD, 'blue': 0x0000FF, 'blueviolet': 0x8A2BE2,
        'brown': 0xA52A2A, 'burlywood': 0xDEB887, 'cadetblue': 0x5F9EA0, 'chartreuse': 0x7FFF00, 'chocolate': 0xD2691E, 'coral': 0xFF7F50,
        'cornflowerblue': 0x6495ED, 'cornsilk': 0xFFF8DC, 'crimson': 0xDC143C, 'cyan': 0x00FFFF, 'darkblue': 0x00008B, 'darkcyan': 0x008B8B,
        'darkgoldenrod': 0xB8860B, 'darkgray': 0xA9A9A9, 'darkgreen': 0x006400, 'darkgrey': 0xA9A9A9, 'darkkhaki': 0xBDB76B, 'darkmagenta': 0x8B008B,
        'darkolivegreen': 0x556B2F, 'darkorange': 0xFF8C00, 'darkorchid': 0x9932CC, 'darkred': 0x8B0000, 'darksalmon': 0xE9967A, 'darkseagreen': 0x8FBC8F,
        'darkslateblue': 0x483D8B, 'darkslategray': 0x2F4F4F, 'darkslategrey': 0x2F4F4F, 'darkturquoise': 0x00CED1, 'darkviolet': 0x9400D3,
        'deeppink': 0xFF1493, 'deepskyblue': 0x00BFFF, 'dimgray': 0x696969, 'dimgrey': 0x696969, 'dodgerblue': 0x1E90FF, 'firebrick': 0xB22222,
        'floralwhite': 0xFFFAF0, 'forestgreen': 0x228B22, 'fuchsia': 0xFF00FF, 'gainsboro': 0xDCDCDC, 'ghostwhite': 0xF8F8FF, 'gold': 0xFFD700,
        'goldenrod': 0xDAA520, 'gray': 0x808080, 'green': 0x008000, 'greenyellow': 0xADFF2F, 'grey': 0x808080, 'honeydew': 0xF0FFF0, 'hotpink': 0xFF69B4,
        'indianred': 0xCD5C5C, 'indigo': 0x4B0082, 'ivory': 0xFFFFF0, 'khaki': 0xF0E68C, 'lavender': 0xE6E6FA, 'lavenderblush': 0xFFF0F5, 'lawngreen': 0x7CFC00,
        'lemonchiffon': 0xFFFACD, 'lightblue': 0xADD8E6, 'lightcoral': 0xF08080, 'lightcyan': 0xE0FFFF, 'lightgoldenrodyellow': 0xFAFAD2, 'lightgray': 0xD3D3D3,
        'lightgreen': 0x90EE90, 'lightgrey': 0xD3D3D3, 'lightpink': 0xFFB6C1, 'lightsalmon': 0xFFA07A, 'lightseagreen': 0x20B2AA, 'lightskyblue': 0x87CEFA,
        'lightslategray': 0x778899, 'lightslategrey': 0x778899, 'lightsteelblue': 0xB0C4DE, 'lightyellow': 0xFFFFE0, 'lime': 0x00FF00, 'limegreen': 0x32CD32,
        'linen': 0xFAF0E6, 'magenta': 0xFF00FF, 'maroon': 0x800000, 'mediumaquamarine': 0x66CDAA, 'mediumblue': 0x0000CD, 'mediumorchid': 0xBA55D3,
        'mediumpurple': 0x9370DB, 'mediumseagreen': 0x3CB371, 'mediumslateblue': 0x7B68EE, 'mediumspringgreen': 0x00FA9A, 'mediumturquoise': 0x48D1CC,
        'mediumvioletred': 0xC71585, 'midnightblue': 0x191970, 'mintcream': 0xF5FFFA, 'mistyrose': 0xFFE4E1, 'moccasin': 0xFFE4B5, 'navajowhite': 0xFFDEAD,
        'navy': 0x000080, 'oldlace': 0xFDF5E6, 'olive': 0x808000, 'olivedrab': 0x6B8E23, 'orange': 0xFFA500, 'orangered': 0xFF4500, 'orchid': 0xDA70D6,
        'palegoldenrod': 0xEEE8AA, 'palegreen': 0x98FB98, 'paleturquoise': 0xAFEEEE, 'palevioletred': 0xDB7093, 'papayawhip': 0xFFEFD5, 'peachpuff': 0xFFDAB9,
        'peru': 0xCD853F, 'pink': 0xFFC0CB, 'plum': 0xDDA0DD, 'powderblue': 0xB0E0E6, 'purple': 0x800080, 'rebeccapurple': 0x663399, 'red': 0xFF0000, 'rosybrown': 0xBC8F8F,
        'royalblue': 0x4169E1, 'saddlebrown': 0x8B4513, 'salmon': 0xFA8072, 'sandybrown': 0xF4A460, 'seagreen': 0x2E8B57, 'seashell': 0xFFF5EE,
        'sienna': 0xA0522D, 'silver': 0xC0C0C0, 'skyblue': 0x87CEEB, 'slateblue': 0x6A5ACD, 'slategray': 0x708090, 'slategrey': 0x708090, 'snow': 0xFFFAFA,
        'springgreen': 0x00FF7F, 'steelblue': 0x4682B4, 'tan': 0xD2B48C, 'teal': 0x008080, 'thistle': 0xD8BFD8, 'tomato': 0xFF6347, 'turquoise': 0x40E0D0,
        'violet': 0xEE82EE, 'wheat': 0xF5DEB3, 'white': 0xFFFFFF, 'whitesmoke': 0xF5F5F5, 'yellow': 0xFFFF00, 'yellowgreen': 0x9ACD32 };

const _hslA = { h: 0, s: 0, l: 0 };
const _hslB = { h: 0, s: 0, l: 0 };

function hue2rgb( p, q, t ) {

        if ( t < 0 ) t += 1;
        if ( t > 1 ) t -= 1;
        if ( t < 1 / 6 ) return p + ( q - p ) * 6 * t;
        if ( t < 1 / 2 ) return q;
        if ( t < 2 / 3 ) return p + ( q - p ) * 6 * ( 2 / 3 - t );
        return p;

}

function SRGBToLinear( c ) {

        return ( c < 0.04045 ) ? c * 0.0773993808 : Math.pow( c * 0.9478672986 + 0.0521327014, 2.4 );

}

function LinearToSRGB( c ) {

        return ( c < 0.0031308 ) ? c * 12.92 : 1.055 * ( Math.pow( c, 0.41666 ) ) - 0.055;

}

class Color {

        constructor( r, g, b ) {

                Object.defineProperty( this, 'isColor', { value: true } );

                if ( g === undefined && b === undefined ) {

                        // r is THREE.Color, hex or string
                        return this.set( r );

                }

                return this.setRGB( r, g, b );

        }

        set( value ) {

                if ( value && value.isColor ) {

                        this.copy( value );

                } else if ( typeof value === 'number' ) {

                        this.setHex( value );

                } else if ( typeof value === 'string' ) {

                        this.setStyle( value );

                }

                return this;

        }

        setScalar( scalar ) {

                this.r = scalar;
                this.g = scalar;
                this.b = scalar;

                return this;

        }

        setHex( hex ) {

                hex = Math.floor( hex );

                this.r = ( hex >> 16 & 255 ) / 255;
                this.g = ( hex >> 8 & 255 ) / 255;
                this.b = ( hex & 255 ) / 255;

                return this;

        }

        setRGB( r, g, b ) {

                this.r = r;
                this.g = g;
                this.b = b;

                return this;

        }

        setHSL( h, s, l ) {

                // h,s,l ranges are in 0.0 - 1.0
                h = MathUtils.euclideanModulo( h, 1 );
                s = MathUtils.clamp( s, 0, 1 );
                l = MathUtils.clamp( l, 0, 1 );

                if ( s === 0 ) {

                        this.r = this.g = this.b = l;

                } else {

                        const p = l <= 0.5 ? l * ( 1 + s ) : l + s - ( l * s );
                        const q = ( 2 * l ) - p;

                        this.r = hue2rgb( q, p, h + 1 / 3 );
                        this.g = hue2rgb( q, p, h );
                        this.b = hue2rgb( q, p, h - 1 / 3 );

                }

                return this;

        }

        setStyle( style ) {

                function handleAlpha( string ) {

                        if ( string === undefined ) return;

                        if ( parseFloat( string ) < 1 ) {

                                console.warn( 'THREE.Color: Alpha component of ' + style + ' will be ignored.' );

                        }

                }


                let m;

                if ( m = /^((?:rgb|hsl)a?)\(\s*([^\)]*)\)/.exec( style ) ) {

                        // rgb / hsl

                        let color;
                        const name = m[ 1 ];
                        const components = m[ 2 ];

                        switch ( name ) {

                                case 'rgb':
                                case 'rgba':

                                        if ( color = /^(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec( components ) ) {

                                                // rgb(255,0,0) rgba(255,0,0,0.5)
                                                this.r = Math.min( 255, parseInt( color[ 1 ], 10 ) ) / 255;
                                                this.g = Math.min( 255, parseInt( color[ 2 ], 10 ) ) / 255;
                                                this.b = Math.min( 255, parseInt( color[ 3 ], 10 ) ) / 255;

                                                handleAlpha( color[ 5 ] );

                                                return this;

                                        }

                                        if ( color = /^(\d+)\%\s*,\s*(\d+)\%\s*,\s*(\d+)\%\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec( components ) ) {

                                                // rgb(100%,0%,0%) rgba(100%,0%,0%,0.5)
                                                this.r = Math.min( 100, parseInt( color[ 1 ], 10 ) ) / 100;
                                                this.g = Math.min( 100, parseInt( color[ 2 ], 10 ) ) / 100;
                                                this.b = Math.min( 100, parseInt( color[ 3 ], 10 ) ) / 100;

                                                handleAlpha( color[ 5 ] );

                                                return this;

                                        }

                                        break;

                                case 'hsl':
                                case 'hsla':

                                        if ( color = /^([0-9]*\.?[0-9]+)\s*,\s*(\d+)\%\s*,\s*(\d+)\%\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec( components ) ) {

                                                // hsl(120,50%,50%) hsla(120,50%,50%,0.5)
                                                const h = parseFloat( color[ 1 ] ) / 360;
                                                const s = parseInt( color[ 2 ], 10 ) / 100;
                                                const l = parseInt( color[ 3 ], 10 ) / 100;

                                                handleAlpha( color[ 5 ] );

                                                return this.setHSL( h, s, l );

                                        }

                                        break;

                        }

                } else if ( m = /^\#([A-Fa-f0-9]+)$/.exec( style ) ) {

                        // hex color

                        const hex = m[ 1 ];
                        const size = hex.length;

                        if ( size === 3 ) {

                                // #ff0
                                this.r = parseInt( hex.charAt( 0 ) + hex.charAt( 0 ), 16 ) / 255;
                                this.g = parseInt( hex.charAt( 1 ) + hex.charAt( 1 ), 16 ) / 255;
                                this.b = parseInt( hex.charAt( 2 ) + hex.charAt( 2 ), 16 ) / 255;

                                return this;

                        } else if ( size === 6 ) {

                                // #ff0000
                                this.r = parseInt( hex.charAt( 0 ) + hex.charAt( 1 ), 16 ) / 255;
                                this.g = parseInt( hex.charAt( 2 ) + hex.charAt( 3 ), 16 ) / 255;
                                this.b = parseInt( hex.charAt( 4 ) + hex.charAt( 5 ), 16 ) / 255;

                                return this;

                        }

                }

                if ( style && style.length > 0 ) {

                        return this.setColorName( style );

                }

                return this;

        }

        setColorName( style ) {

                // color keywords
                const hex = _colorKeywords[ style ];

                if ( hex !== undefined ) {

                        // red
                        this.setHex( hex );

                } else {

                        // unknown color
                        console.warn( 'THREE.Color: Unknown color ' + style );

                }

                return this;

        }

        clone() {

                return new this.constructor( this.r, this.g, this.b );

        }

        copy( color ) {

                this.r = color.r;
                this.g = color.g;
                this.b = color.b;

                return this;

        }

        copyGammaToLinear( color, gammaFactor = 2.0 ) {

                this.r = Math.pow( color.r, gammaFactor );
                this.g = Math.pow( color.g, gammaFactor );
                this.b = Math.pow( color.b, gammaFactor );

                return this;

        }

        copyLinearToGamma( color, gammaFactor = 2.0 ) {

                const safeInverse = ( gammaFactor > 0 ) ? ( 1.0 / gammaFactor ) : 1.0;

                this.r = Math.pow( color.r, safeInverse );
                this.g = Math.pow( color.g, safeInverse );
                this.b = Math.pow( color.b, safeInverse );

                return this;

        }

        convertGammaToLinear( gammaFactor ) {

                this.copyGammaToLinear( this, gammaFactor );

                return this;

        }

        convertLinearToGamma( gammaFactor ) {

                this.copyLinearToGamma( this, gammaFactor );

                return this;

        }

        copySRGBToLinear( color ) {

                this.r = SRGBToLinear( color.r );
                this.g = SRGBToLinear( color.g );
                this.b = SRGBToLinear( color.b );

                return this;

        }

        copyLinearToSRGB( color ) {

                this.r = LinearToSRGB( color.r );
                this.g = LinearToSRGB( color.g );
                this.b = LinearToSRGB( color.b );

                return this;

        }

        convertSRGBToLinear() {

                this.copySRGBToLinear( this );

                return this;

        }

        convertLinearToSRGB() {

                this.copyLinearToSRGB( this );

                return this;

        }

        getHex() {

                return ( this.r * 255 ) << 16 ^ ( this.g * 255 ) << 8 ^ ( this.b * 255 ) << 0;

        }

        getHexString() {

                return ( '000000' + this.getHex().toString( 16 ) ).slice( - 6 );

        }

        getHSL( target ) {

                // h,s,l ranges are in 0.0 - 1.0

                if ( target === undefined ) {

                        console.warn( 'THREE.Color: .getHSL() target is now required' );
                        target = { h: 0, s: 0, l: 0 };

                }

                const r = this.r, g = this.g, b = this.b;

                const max = Math.max( r, g, b );
                const min = Math.min( r, g, b );

                let hue, saturation;
                const lightness = ( min + max ) / 2.0;

                if ( min === max ) {

                        hue = 0;
                        saturation = 0;

                } else {

                        const delta = max - min;

                        saturation = lightness <= 0.5 ? delta / ( max + min ) : delta / ( 2 - max - min );

                        switch ( max ) {

                                case r: hue = ( g - b ) / delta + ( g < b ? 6 : 0 ); break;
                                case g: hue = ( b - r ) / delta + 2; break;
                                case b: hue = ( r - g ) / delta + 4; break;

                        }

                        hue /= 6;

                }

                target.h = hue;
                target.s = saturation;
                target.l = lightness;

                return target;

        }

        getStyle() {

                return 'rgb(' + ( ( this.r * 255 ) | 0 ) + ',' + ( ( this.g * 255 ) | 0 ) + ',' + ( ( this.b * 255 ) | 0 ) + ')';

        }

        offsetHSL( h, s, l ) {

                this.getHSL( _hslA );

                _hslA.h += h; _hslA.s += s; _hslA.l += l;

                this.setHSL( _hslA.h, _hslA.s, _hslA.l );

                return this;

        }

        add( color ) {

                this.r += color.r;
                this.g += color.g;
                this.b += color.b;

                return this;

        }

        addColors( color1, color2 ) {

                this.r = color1.r + color2.r;
                this.g = color1.g + color2.g;
                this.b = color1.b + color2.b;

                return this;

        }

        addScalar( s ) {

                this.r += s;
                this.g += s;
                this.b += s;

                return this;

        }

        sub( color ) {

                this.r = Math.max( 0, this.r - color.r );
                this.g = Math.max( 0, this.g - color.g );
                this.b = Math.max( 0, this.b - color.b );

                return this;

        }

        multiply( color ) {

                this.r *= color.r;
                this.g *= color.g;
                this.b *= color.b;

                return this;

        }

        multiplyScalar( s ) {

                this.r *= s;
                this.g *= s;
                this.b *= s;

                return this;

        }

        lerp( color, alpha ) {

                this.r += ( color.r - this.r ) * alpha;
                this.g += ( color.g - this.g ) * alpha;
                this.b += ( color.b - this.b ) * alpha;

                return this;

        }

        lerpHSL( color, alpha ) {

                this.getHSL( _hslA );
                color.getHSL( _hslB );

                const h = MathUtils.lerp( _hslA.h, _hslB.h, alpha );
                const s = MathUtils.lerp( _hslA.s, _hslB.s, alpha );
                const l = MathUtils.lerp( _hslA.l, _hslB.l, alpha );

                this.setHSL( h, s, l );

                return this;

        }

        equals( c ) {

                return ( c.r === this.r ) && ( c.g === this.g ) && ( c.b === this.b );

        }

        fromArray( array, offset = 0 ) {

                this.r = array[ offset ];
                this.g = array[ offset + 1 ];
                this.b = array[ offset + 2 ];

                return this;

        }

        toArray( array = [], offset = 0 ) {

                array[ offset ] = this.r;
                array[ offset + 1 ] = this.g;
                array[ offset + 2 ] = this.b;

                return array;

        }

        fromBufferAttribute( attribute, index ) {

                this.r = attribute.getX( index );
                this.g = attribute.getY( index );
                this.b = attribute.getZ( index );

                if ( attribute.normalized === true ) {

                        // assuming Uint8Array

                        this.r /= 255;
                        this.g /= 255;
                        this.b /= 255;

                }

                return this;

        }

        toJSON() {

                return this.getHex();

        }

}

Color.NAMES = _colorKeywords;
Color.prototype.r = 1;
Color.prototype.g = 1;
Color.prototype.b = 1;

class Face3 {

        constructor( a, b, c, normal, color, materialIndex = 0 ) {

                this.a = a;
                this.b = b;
                this.c = c;

                this.normal = ( normal && normal.isVector3 ) ? normal : new Vector3();
                this.vertexNormals = Array.isArray( normal ) ? normal : [];

                this.color = ( color && color.isColor ) ? color : new Color();
                this.vertexColors = Array.isArray( color ) ? color : [];

                this.materialIndex = materialIndex;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( source ) {

                this.a = source.a;
                this.b = source.b;
                this.c = source.c;

                this.normal.copy( source.normal );
                this.color.copy( source.color );

                this.materialIndex = source.materialIndex;

                for ( let i = 0, il = source.vertexNormals.length; i < il; i ++ ) {

                        this.vertexNormals[ i ] = source.vertexNormals[ i ].clone();

                }

                for ( let i = 0, il = source.vertexColors.length; i < il; i ++ ) {

                        this.vertexColors[ i ] = source.vertexColors[ i ].clone();

                }

                return this;

        }

}

let materialId = 0;

function Material() {

        Object.defineProperty( this, 'id', { value: materialId ++ } );

        this.uuid = MathUtils.generateUUID();

        this.name = '';
        this.type = 'Material';

        this.fog = true;

        this.blending = NormalBlending;
        this.side = FrontSide;
        this.flatShading = false;
        this.vertexColors = false;

        this.opacity = 1;
        this.transparent = false;

        this.blendSrc = SrcAlphaFactor;
        this.blendDst = OneMinusSrcAlphaFactor;
        this.blendEquation = AddEquation;
        this.blendSrcAlpha = null;
        this.blendDstAlpha = null;
        this.blendEquationAlpha = null;

        this.depthFunc = LessEqualDepth;
        this.depthTest = true;
        this.depthWrite = true;

        this.stencilWriteMask = 0xff;
        this.stencilFunc = AlwaysStencilFunc;
        this.stencilRef = 0;
        this.stencilFuncMask = 0xff;
        this.stencilFail = KeepStencilOp;
        this.stencilZFail = KeepStencilOp;
        this.stencilZPass = KeepStencilOp;
        this.stencilWrite = false;

        this.clippingPlanes = null;
        this.clipIntersection = false;
        this.clipShadows = false;

        this.shadowSide = null;

        this.colorWrite = true;

        this.precision = null; // override the renderer's default precision for this material

        this.polygonOffset = false;
        this.polygonOffsetFactor = 0;
        this.polygonOffsetUnits = 0;

        this.dithering = false;

        this.alphaTest = 0;
        this.premultipliedAlpha = false;

        this.visible = true;

        this.toneMapped = true;

        this.userData = {};

        this.version = 0;

}

Material.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

        constructor: Material,

        isMaterial: true,

        onBeforeCompile: function ( /* shaderobject, renderer */ ) {},

        customProgramCacheKey: function () {

                return this.onBeforeCompile.toString();

        },

        setValues: function ( values ) {

                if ( values === undefined ) return;

                for ( const key in values ) {

                        const newValue = values[ key ];

                        if ( newValue === undefined ) {

                                console.warn( "THREE.Material: '" + key + "' parameter is undefined." );
                                continue;

                        }

                        // for backward compatability if shading is set in the constructor
                        if ( key === 'shading' ) {

                                console.warn( 'THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.' );
                                this.flatShading = ( newValue === FlatShading ) ? true : false;
                                continue;

                        }

                        const currentValue = this[ key ];

                        if ( currentValue === undefined ) {

                                console.warn( "THREE." + this.type + ": '" + key + "' is not a property of this material." );
                                continue;

                        }

                        if ( currentValue && currentValue.isColor ) {

                                currentValue.set( newValue );

                        } else if ( ( currentValue && currentValue.isVector3 ) && ( newValue && newValue.isVector3 ) ) {

                                currentValue.copy( newValue );

                        } else {

                                this[ key ] = newValue;

                        }

                }

        },

        toJSON: function ( meta ) {

                const isRoot = ( meta === undefined || typeof meta === 'string' );

                if ( isRoot ) {

                        meta = {
                                textures: {},
                                images: {}
                        };

                }

                const data = {
                        metadata: {
                                version: 4.5,
                                type: 'Material',
                                generator: 'Material.toJSON'
                        }
                };

                // standard Material serialization
                data.uuid = this.uuid;
                data.type = this.type;

                if ( this.name !== '' ) data.name = this.name;

                if ( this.color && this.color.isColor ) data.color = this.color.getHex();

                if ( this.roughness !== undefined ) data.roughness = this.roughness;
                if ( this.metalness !== undefined ) data.metalness = this.metalness;

                if ( this.sheen && this.sheen.isColor ) data.sheen = this.sheen.getHex();
                if ( this.emissive && this.emissive.isColor ) data.emissive = this.emissive.getHex();
                if ( this.emissiveIntensity && this.emissiveIntensity !== 1 ) data.emissiveIntensity = this.emissiveIntensity;

                if ( this.specular && this.specular.isColor ) data.specular = this.specular.getHex();
                if ( this.shininess !== undefined ) data.shininess = this.shininess;
                if ( this.clearcoat !== undefined ) data.clearcoat = this.clearcoat;
                if ( this.clearcoatRoughness !== undefined ) data.clearcoatRoughness = this.clearcoatRoughness;

                if ( this.clearcoatMap && this.clearcoatMap.isTexture ) {

                        data.clearcoatMap = this.clearcoatMap.toJSON( meta ).uuid;

                }

                if ( this.clearcoatRoughnessMap && this.clearcoatRoughnessMap.isTexture ) {

                        data.clearcoatRoughnessMap = this.clearcoatRoughnessMap.toJSON( meta ).uuid;

                }

                if ( this.clearcoatNormalMap && this.clearcoatNormalMap.isTexture ) {

                        data.clearcoatNormalMap = this.clearcoatNormalMap.toJSON( meta ).uuid;
                        data.clearcoatNormalScale = this.clearcoatNormalScale.toArray();

                }

                if ( this.map && this.map.isTexture ) data.map = this.map.toJSON( meta ).uuid;
                if ( this.matcap && this.matcap.isTexture ) data.matcap = this.matcap.toJSON( meta ).uuid;
                if ( this.alphaMap && this.alphaMap.isTexture ) data.alphaMap = this.alphaMap.toJSON( meta ).uuid;
                if ( this.lightMap && this.lightMap.isTexture ) data.lightMap = this.lightMap.toJSON( meta ).uuid;

                if ( this.aoMap && this.aoMap.isTexture ) {

                        data.aoMap = this.aoMap.toJSON( meta ).uuid;
                        data.aoMapIntensity = this.aoMapIntensity;

                }

                if ( this.bumpMap && this.bumpMap.isTexture ) {

                        data.bumpMap = this.bumpMap.toJSON( meta ).uuid;
                        data.bumpScale = this.bumpScale;

                }

                if ( this.normalMap && this.normalMap.isTexture ) {

                        data.normalMap = this.normalMap.toJSON( meta ).uuid;
                        data.normalMapType = this.normalMapType;
                        data.normalScale = this.normalScale.toArray();

                }

                if ( this.displacementMap && this.displacementMap.isTexture ) {

                        data.displacementMap = this.displacementMap.toJSON( meta ).uuid;
                        data.displacementScale = this.displacementScale;
                        data.displacementBias = this.displacementBias;

                }

                if ( this.roughnessMap && this.roughnessMap.isTexture ) data.roughnessMap = this.roughnessMap.toJSON( meta ).uuid;
                if ( this.metalnessMap && this.metalnessMap.isTexture ) data.metalnessMap = this.metalnessMap.toJSON( meta ).uuid;

                if ( this.emissiveMap && this.emissiveMap.isTexture ) data.emissiveMap = this.emissiveMap.toJSON( meta ).uuid;
                if ( this.specularMap && this.specularMap.isTexture ) data.specularMap = this.specularMap.toJSON( meta ).uuid;

                if ( this.envMap && this.envMap.isTexture ) {

                        data.envMap = this.envMap.toJSON( meta ).uuid;
                        data.reflectivity = this.reflectivity; // Scale behind envMap
                        data.refractionRatio = this.refractionRatio;

                        if ( this.combine !== undefined ) data.combine = this.combine;
                        if ( this.envMapIntensity !== undefined ) data.envMapIntensity = this.envMapIntensity;

                }

                if ( this.gradientMap && this.gradientMap.isTexture ) {

                        data.gradientMap = this.gradientMap.toJSON( meta ).uuid;

                }

                if ( this.size !== undefined ) data.size = this.size;
                if ( this.sizeAttenuation !== undefined ) data.sizeAttenuation = this.sizeAttenuation;

                if ( this.blending !== NormalBlending ) data.blending = this.blending;
                if ( this.flatShading === true ) data.flatShading = this.flatShading;
                if ( this.side !== FrontSide ) data.side = this.side;
                if ( this.vertexColors ) data.vertexColors = true;

                if ( this.opacity < 1 ) data.opacity = this.opacity;
                if ( this.transparent === true ) data.transparent = this.transparent;

                data.depthFunc = this.depthFunc;
                data.depthTest = this.depthTest;
                data.depthWrite = this.depthWrite;

                data.stencilWrite = this.stencilWrite;
                data.stencilWriteMask = this.stencilWriteMask;
                data.stencilFunc = this.stencilFunc;
                data.stencilRef = this.stencilRef;
                data.stencilFuncMask = this.stencilFuncMask;
                data.stencilFail = this.stencilFail;
                data.stencilZFail = this.stencilZFail;
                data.stencilZPass = this.stencilZPass;

                // rotation (SpriteMaterial)
                if ( this.rotation && this.rotation !== 0 ) data.rotation = this.rotation;

                if ( this.polygonOffset === true ) data.polygonOffset = true;
                if ( this.polygonOffsetFactor !== 0 ) data.polygonOffsetFactor = this.polygonOffsetFactor;
                if ( this.polygonOffsetUnits !== 0 ) data.polygonOffsetUnits = this.polygonOffsetUnits;

                if ( this.linewidth && this.linewidth !== 1 ) data.linewidth = this.linewidth;
                if ( this.dashSize !== undefined ) data.dashSize = this.dashSize;
                if ( this.gapSize !== undefined ) data.gapSize = this.gapSize;
                if ( this.scale !== undefined ) data.scale = this.scale;

                if ( this.dithering === true ) data.dithering = true;

                if ( this.alphaTest > 0 ) data.alphaTest = this.alphaTest;
                if ( this.premultipliedAlpha === true ) data.premultipliedAlpha = this.premultipliedAlpha;

                if ( this.wireframe === true ) data.wireframe = this.wireframe;
                if ( this.wireframeLinewidth > 1 ) data.wireframeLinewidth = this.wireframeLinewidth;
                if ( this.wireframeLinecap !== 'round' ) data.wireframeLinecap = this.wireframeLinecap;
                if ( this.wireframeLinejoin !== 'round' ) data.wireframeLinejoin = this.wireframeLinejoin;

                if ( this.morphTargets === true ) data.morphTargets = true;
                if ( this.morphNormals === true ) data.morphNormals = true;
                if ( this.skinning === true ) data.skinning = true;

                if ( this.visible === false ) data.visible = false;

                if ( this.toneMapped === false ) data.toneMapped = false;

                if ( JSON.stringify( this.userData ) !== '{}' ) data.userData = this.userData;

                // TODO: Copied from Object3D.toJSON

                function extractFromCache( cache ) {

                        const values = [];

                        for ( const key in cache ) {

                                const data = cache[ key ];
                                delete data.metadata;
                                values.push( data );

                        }

                        return values;

                }

                if ( isRoot ) {

                        const textures = extractFromCache( meta.textures );
                        const images = extractFromCache( meta.images );

                        if ( textures.length > 0 ) data.textures = textures;
                        if ( images.length > 0 ) data.images = images;

                }

                return data;

        },

        clone: function () {

                return new this.constructor().copy( this );

        },

        copy: function ( source ) {

                this.name = source.name;

                this.fog = source.fog;

                this.blending = source.blending;
                this.side = source.side;
                this.flatShading = source.flatShading;
                this.vertexColors = source.vertexColors;

                this.opacity = source.opacity;
                this.transparent = source.transparent;

                this.blendSrc = source.blendSrc;
                this.blendDst = source.blendDst;
                this.blendEquation = source.blendEquation;
                this.blendSrcAlpha = source.blendSrcAlpha;
                this.blendDstAlpha = source.blendDstAlpha;
                this.blendEquationAlpha = source.blendEquationAlpha;

                this.depthFunc = source.depthFunc;
                this.depthTest = source.depthTest;
                this.depthWrite = source.depthWrite;

                this.stencilWriteMask = source.stencilWriteMask;
                this.stencilFunc = source.stencilFunc;
                this.stencilRef = source.stencilRef;
                this.stencilFuncMask = source.stencilFuncMask;
                this.stencilFail = source.stencilFail;
                this.stencilZFail = source.stencilZFail;
                this.stencilZPass = source.stencilZPass;
                this.stencilWrite = source.stencilWrite;

                const srcPlanes = source.clippingPlanes;
                let dstPlanes = null;

                if ( srcPlanes !== null ) {

                        const n = srcPlanes.length;
                        dstPlanes = new Array( n );

                        for ( let i = 0; i !== n; ++ i ) {

                                dstPlanes[ i ] = srcPlanes[ i ].clone();

                        }

                }

                this.clippingPlanes = dstPlanes;
                this.clipIntersection = source.clipIntersection;
                this.clipShadows = source.clipShadows;

                this.shadowSide = source.shadowSide;

                this.colorWrite = source.colorWrite;

                this.precision = source.precision;

                this.polygonOffset = source.polygonOffset;
                this.polygonOffsetFactor = source.polygonOffsetFactor;
                this.polygonOffsetUnits = source.polygonOffsetUnits;

                this.dithering = source.dithering;

                this.alphaTest = source.alphaTest;
                this.premultipliedAlpha = source.premultipliedAlpha;

                this.visible = source.visible;

                this.toneMapped = source.toneMapped;

                this.userData = JSON.parse( JSON.stringify( source.userData ) );

                return this;

        },

        dispose: function () {

                this.dispatchEvent( { type: 'dispose' } );

        }

} );

Object.defineProperty( Material.prototype, 'needsUpdate', {

        set: function ( value ) {

                if ( value === true ) this.version ++;

        }

} );

/**
 * parameters = {
 *  color: <hex>,
 *  opacity: <float>,
 *  map: new THREE.Texture( <Image> ),
 *
 *  lightMap: new THREE.Texture( <Image> ),
 *  lightMapIntensity: <float>
 *
 *  aoMap: new THREE.Texture( <Image> ),
 *  aoMapIntensity: <float>
 *
 *  specularMap: new THREE.Texture( <Image> ),
 *
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
 *  combine: THREE.Multiply,
 *  reflectivity: <float>,
 *  refractionRatio: <float>,
 *
 *  depthTest: <bool>,
 *  depthWrite: <bool>,
 *
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>,
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>
 * }
 */

function MeshBasicMaterial( parameters ) {

        Material.call( this );

        this.type = 'MeshBasicMaterial';

        this.color = new Color( 0xffffff ); // emissive

        this.map = null;

        this.lightMap = null;
        this.lightMapIntensity = 1.0;

        this.aoMap = null;
        this.aoMapIntensity = 1.0;

        this.specularMap = null;

        this.alphaMap = null;

        this.envMap = null;
        this.combine = MultiplyOperation;
        this.reflectivity = 1;
        this.refractionRatio = 0.98;

        this.wireframe = false;
        this.wireframeLinewidth = 1;
        this.wireframeLinecap = 'round';
        this.wireframeLinejoin = 'round';

        this.skinning = false;
        this.morphTargets = false;

        this.setValues( parameters );

}

MeshBasicMaterial.prototype = Object.create( Material.prototype );
MeshBasicMaterial.prototype.constructor = MeshBasicMaterial;

MeshBasicMaterial.prototype.isMeshBasicMaterial = true;

MeshBasicMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.color.copy( source.color );

        this.map = source.map;

        this.lightMap = source.lightMap;
        this.lightMapIntensity = source.lightMapIntensity;

        this.aoMap = source.aoMap;
        this.aoMapIntensity = source.aoMapIntensity;

        this.specularMap = source.specularMap;

        this.alphaMap = source.alphaMap;

        this.envMap = source.envMap;
        this.combine = source.combine;
        this.reflectivity = source.reflectivity;
        this.refractionRatio = source.refractionRatio;

        this.wireframe = source.wireframe;
        this.wireframeLinewidth = source.wireframeLinewidth;
        this.wireframeLinecap = source.wireframeLinecap;
        this.wireframeLinejoin = source.wireframeLinejoin;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;

        return this;

};

const _vector$3 = new Vector3();
const _vector2$1 = new Vector2();

function BufferAttribute( array, itemSize, normalized ) {

        if ( Array.isArray( array ) ) {

                throw new TypeError( 'THREE.BufferAttribute: array should be a Typed Array.' );

        }

        this.name = '';

        this.array = array;
        this.itemSize = itemSize;
        this.count = array !== undefined ? array.length / itemSize : 0;
        this.normalized = normalized === true;

        this.usage = StaticDrawUsage;
        this.updateRange = { offset: 0, count: - 1 };

        this.version = 0;

}

Object.defineProperty( BufferAttribute.prototype, 'needsUpdate', {

        set: function ( value ) {

                if ( value === true ) this.version ++;

        }

} );

Object.assign( BufferAttribute.prototype, {

        isBufferAttribute: true,

        onUploadCallback: function () {},

        setUsage: function ( value ) {

                this.usage = value;

                return this;

        },

        copy: function ( source ) {

                this.name = source.name;
                this.array = new source.array.constructor( source.array );
                this.itemSize = source.itemSize;
                this.count = source.count;
                this.normalized = source.normalized;

                this.usage = source.usage;

                return this;

        },

        copyAt: function ( index1, attribute, index2 ) {

                index1 *= this.itemSize;
                index2 *= attribute.itemSize;

                for ( let i = 0, l = this.itemSize; i < l; i ++ ) {

                        this.array[ index1 + i ] = attribute.array[ index2 + i ];

                }

                return this;

        },

        copyArray: function ( array ) {

                this.array.set( array );

                return this;

        },

        copyColorsArray: function ( colors ) {

                const array = this.array;
                let offset = 0;

                for ( let i = 0, l = colors.length; i < l; i ++ ) {

                        let color = colors[ i ];

                        if ( color === undefined ) {

                                console.warn( 'THREE.BufferAttribute.copyColorsArray(): color is undefined', i );
                                color = new Color();

                        }

                        array[ offset ++ ] = color.r;
                        array[ offset ++ ] = color.g;
                        array[ offset ++ ] = color.b;

                }

                return this;

        },

        copyVector2sArray: function ( vectors ) {

                const array = this.array;
                let offset = 0;

                for ( let i = 0, l = vectors.length; i < l; i ++ ) {

                        let vector = vectors[ i ];

                        if ( vector === undefined ) {

                                console.warn( 'THREE.BufferAttribute.copyVector2sArray(): vector is undefined', i );
                                vector = new Vector2();

                        }

                        array[ offset ++ ] = vector.x;
                        array[ offset ++ ] = vector.y;

                }

                return this;

        },

        copyVector3sArray: function ( vectors ) {

                const array = this.array;
                let offset = 0;

                for ( let i = 0, l = vectors.length; i < l; i ++ ) {

                        let vector = vectors[ i ];

                        if ( vector === undefined ) {

                                console.warn( 'THREE.BufferAttribute.copyVector3sArray(): vector is undefined', i );
                                vector = new Vector3();

                        }

                        array[ offset ++ ] = vector.x;
                        array[ offset ++ ] = vector.y;
                        array[ offset ++ ] = vector.z;

                }

                return this;

        },

        copyVector4sArray: function ( vectors ) {

                const array = this.array;
                let offset = 0;

                for ( let i = 0, l = vectors.length; i < l; i ++ ) {

                        let vector = vectors[ i ];

                        if ( vector === undefined ) {

                                console.warn( 'THREE.BufferAttribute.copyVector4sArray(): vector is undefined', i );
                                vector = new Vector4();

                        }

                        array[ offset ++ ] = vector.x;
                        array[ offset ++ ] = vector.y;
                        array[ offset ++ ] = vector.z;
                        array[ offset ++ ] = vector.w;

                }

                return this;

        },

        applyMatrix3: function ( m ) {

                if ( this.itemSize === 2 ) {

                        for ( let i = 0, l = this.count; i < l; i ++ ) {

                                _vector2$1.fromBufferAttribute( this, i );
                                _vector2$1.applyMatrix3( m );

                                this.setXY( i, _vector2$1.x, _vector2$1.y );

                        }

                } else if ( this.itemSize === 3 ) {

                        for ( let i = 0, l = this.count; i < l; i ++ ) {

                                _vector$3.fromBufferAttribute( this, i );
                                _vector$3.applyMatrix3( m );

                                this.setXYZ( i, _vector$3.x, _vector$3.y, _vector$3.z );

                        }

                }

                return this;

        },

        applyMatrix4: function ( m ) {

                for ( let i = 0, l = this.count; i < l; i ++ ) {

                        _vector$3.x = this.getX( i );
                        _vector$3.y = this.getY( i );
                        _vector$3.z = this.getZ( i );

                        _vector$3.applyMatrix4( m );

                        this.setXYZ( i, _vector$3.x, _vector$3.y, _vector$3.z );

                }

                return this;

        },

        applyNormalMatrix: function ( m ) {

                for ( let i = 0, l = this.count; i < l; i ++ ) {

                        _vector$3.x = this.getX( i );
                        _vector$3.y = this.getY( i );
                        _vector$3.z = this.getZ( i );

                        _vector$3.applyNormalMatrix( m );

                        this.setXYZ( i, _vector$3.x, _vector$3.y, _vector$3.z );

                }

                return this;

        },

        transformDirection: function ( m ) {

                for ( let i = 0, l = this.count; i < l; i ++ ) {

                        _vector$3.x = this.getX( i );
                        _vector$3.y = this.getY( i );
                        _vector$3.z = this.getZ( i );

                        _vector$3.transformDirection( m );

                        this.setXYZ( i, _vector$3.x, _vector$3.y, _vector$3.z );

                }

                return this;

        },

        set: function ( value, offset = 0 ) {

                this.array.set( value, offset );

                return this;

        },

        getX: function ( index ) {

                return this.array[ index * this.itemSize ];

        },

        setX: function ( index, x ) {

                this.array[ index * this.itemSize ] = x;

                return this;

        },

        getY: function ( index ) {

                return this.array[ index * this.itemSize + 1 ];

        },

        setY: function ( index, y ) {

                this.array[ index * this.itemSize + 1 ] = y;

                return this;

        },

        getZ: function ( index ) {

                return this.array[ index * this.itemSize + 2 ];

        },

        setZ: function ( index, z ) {

                this.array[ index * this.itemSize + 2 ] = z;

                return this;

        },

        getW: function ( index ) {

                return this.array[ index * this.itemSize + 3 ];

        },

        setW: function ( index, w ) {

                this.array[ index * this.itemSize + 3 ] = w;

                return this;

        },

        setXY: function ( index, x, y ) {

                index *= this.itemSize;

                this.array[ index + 0 ] = x;
                this.array[ index + 1 ] = y;

                return this;

        },

        setXYZ: function ( index, x, y, z ) {

                index *= this.itemSize;

                this.array[ index + 0 ] = x;
                this.array[ index + 1 ] = y;
                this.array[ index + 2 ] = z;

                return this;

        },

        setXYZW: function ( index, x, y, z, w ) {

                index *= this.itemSize;

                this.array[ index + 0 ] = x;
                this.array[ index + 1 ] = y;
                this.array[ index + 2 ] = z;
                this.array[ index + 3 ] = w;

                return this;

        },

        onUpload: function ( callback ) {

                this.onUploadCallback = callback;

                return this;

        },

        clone: function () {

                return new this.constructor( this.array, this.itemSize ).copy( this );

        },

        toJSON: function () {

                return {
                        itemSize: this.itemSize,
                        type: this.array.constructor.name,
                        array: Array.prototype.slice.call( this.array ),
                        normalized: this.normalized
                };

        }

} );

//

function Int8BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Int8Array( array ), itemSize, normalized );

}

Int8BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Int8BufferAttribute.prototype.constructor = Int8BufferAttribute;


function Uint8BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Uint8Array( array ), itemSize, normalized );

}

Uint8BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Uint8BufferAttribute.prototype.constructor = Uint8BufferAttribute;


function Uint8ClampedBufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Uint8ClampedArray( array ), itemSize, normalized );

}

Uint8ClampedBufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Uint8ClampedBufferAttribute.prototype.constructor = Uint8ClampedBufferAttribute;


function Int16BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Int16Array( array ), itemSize, normalized );

}

Int16BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Int16BufferAttribute.prototype.constructor = Int16BufferAttribute;


function Uint16BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Uint16Array( array ), itemSize, normalized );

}

Uint16BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Uint16BufferAttribute.prototype.constructor = Uint16BufferAttribute;


function Int32BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Int32Array( array ), itemSize, normalized );

}

Int32BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Int32BufferAttribute.prototype.constructor = Int32BufferAttribute;


function Uint32BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Uint32Array( array ), itemSize, normalized );

}

Uint32BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Uint32BufferAttribute.prototype.constructor = Uint32BufferAttribute;

function Float16BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Uint16Array( array ), itemSize, normalized );

}

Float16BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Float16BufferAttribute.prototype.constructor = Float16BufferAttribute;
Float16BufferAttribute.prototype.isFloat16BufferAttribute = true;

function Float32BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Float32Array( array ), itemSize, normalized );

}

Float32BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Float32BufferAttribute.prototype.constructor = Float32BufferAttribute;


function Float64BufferAttribute( array, itemSize, normalized ) {

        BufferAttribute.call( this, new Float64Array( array ), itemSize, normalized );

}

Float64BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
Float64BufferAttribute.prototype.constructor = Float64BufferAttribute;

class DirectGeometry {

        constructor() {

                this.vertices = [];
                this.normals = [];
                this.colors = [];
                this.uvs = [];
                this.uvs2 = [];

                this.groups = [];

                this.morphTargets = {};

                this.skinWeights = [];
                this.skinIndices = [];

                // this.lineDistances = [];

                this.boundingBox = null;
                this.boundingSphere = null;

                // update flags

                this.verticesNeedUpdate = false;
                this.normalsNeedUpdate = false;
                this.colorsNeedUpdate = false;
                this.uvsNeedUpdate = false;
                this.groupsNeedUpdate = false;

        }

        computeGroups( geometry ) {

                const groups = [];

                let group, i;
                let materialIndex = undefined;

                const faces = geometry.faces;

                for ( i = 0; i < faces.length; i ++ ) {

                        const face = faces[ i ];

                        // materials

                        if ( face.materialIndex !== materialIndex ) {

                                materialIndex = face.materialIndex;

                                if ( group !== undefined ) {

                                        group.count = ( i * 3 ) - group.start;
                                        groups.push( group );

                                }

                                group = {
                                        start: i * 3,
                                        materialIndex: materialIndex
                                };

                        }

                }

                if ( group !== undefined ) {

                        group.count = ( i * 3 ) - group.start;
                        groups.push( group );

                }

                this.groups = groups;

        }

        fromGeometry( geometry ) {

                const faces = geometry.faces;
                const vertices = geometry.vertices;
                const faceVertexUvs = geometry.faceVertexUvs;

                const hasFaceVertexUv = faceVertexUvs[ 0 ] && faceVertexUvs[ 0 ].length > 0;
                const hasFaceVertexUv2 = faceVertexUvs[ 1 ] && faceVertexUvs[ 1 ].length > 0;

                // morphs

                const morphTargets = geometry.morphTargets;
                const morphTargetsLength = morphTargets.length;

                let morphTargetsPosition;

                if ( morphTargetsLength > 0 ) {

                        morphTargetsPosition = [];

                        for ( let i = 0; i < morphTargetsLength; i ++ ) {

                                morphTargetsPosition[ i ] = {
                                        name: morphTargets[ i ].name,
                                        data: []
                                };

                        }

                        this.morphTargets.position = morphTargetsPosition;

                }

                const morphNormals = geometry.morphNormals;
                const morphNormalsLength = morphNormals.length;

                let morphTargetsNormal;

                if ( morphNormalsLength > 0 ) {

                        morphTargetsNormal = [];

                        for ( let i = 0; i < morphNormalsLength; i ++ ) {

                                morphTargetsNormal[ i ] = {
                                        name: morphNormals[ i ].name,
                                        data: []
                                };

                        }

                        this.morphTargets.normal = morphTargetsNormal;

                }

                // skins

                const skinIndices = geometry.skinIndices;
                const skinWeights = geometry.skinWeights;

                const hasSkinIndices = skinIndices.length === vertices.length;
                const hasSkinWeights = skinWeights.length === vertices.length;

                //

                if ( vertices.length > 0 && faces.length === 0 ) {

                        console.error( 'THREE.DirectGeometry: Faceless geometries are not supported.' );

                }

                for ( let i = 0; i < faces.length; i ++ ) {

                        const face = faces[ i ];

                        this.vertices.push( vertices[ face.a ], vertices[ face.b ], vertices[ face.c ] );

                        const vertexNormals = face.vertexNormals;

                        if ( vertexNormals.length === 3 ) {

                                this.normals.push( vertexNormals[ 0 ], vertexNormals[ 1 ], vertexNormals[ 2 ] );

                        } else {

                                const normal = face.normal;

                                this.normals.push( normal, normal, normal );

                        }

                        const vertexColors = face.vertexColors;

                        if ( vertexColors.length === 3 ) {

                                this.colors.push( vertexColors[ 0 ], vertexColors[ 1 ], vertexColors[ 2 ] );

                        } else {

                                const color = face.color;

                                this.colors.push( color, color, color );

                        }

                        if ( hasFaceVertexUv === true ) {

                                const vertexUvs = faceVertexUvs[ 0 ][ i ];

                                if ( vertexUvs !== undefined ) {

                                        this.uvs.push( vertexUvs[ 0 ], vertexUvs[ 1 ], vertexUvs[ 2 ] );

                                } else {

                                        console.warn( 'THREE.DirectGeometry.fromGeometry(): Undefined vertexUv ', i );

                                        this.uvs.push( new Vector2(), new Vector2(), new Vector2() );

                                }

                        }

                        if ( hasFaceVertexUv2 === true ) {

                                const vertexUvs = faceVertexUvs[ 1 ][ i ];

                                if ( vertexUvs !== undefined ) {

                                        this.uvs2.push( vertexUvs[ 0 ], vertexUvs[ 1 ], vertexUvs[ 2 ] );

                                } else {

                                        console.warn( 'THREE.DirectGeometry.fromGeometry(): Undefined vertexUv2 ', i );

                                        this.uvs2.push( new Vector2(), new Vector2(), new Vector2() );

                                }

                        }

                        // morphs

                        for ( let j = 0; j < morphTargetsLength; j ++ ) {

                                const morphTarget = morphTargets[ j ].vertices;

                                morphTargetsPosition[ j ].data.push( morphTarget[ face.a ], morphTarget[ face.b ], morphTarget[ face.c ] );

                        }

                        for ( let j = 0; j < morphNormalsLength; j ++ ) {

                                const morphNormal = morphNormals[ j ].vertexNormals[ i ];

                                morphTargetsNormal[ j ].data.push( morphNormal.a, morphNormal.b, morphNormal.c );

                        }

                        // skins

                        if ( hasSkinIndices ) {

                                this.skinIndices.push( skinIndices[ face.a ], skinIndices[ face.b ], skinIndices[ face.c ] );

                        }

                        if ( hasSkinWeights ) {

                                this.skinWeights.push( skinWeights[ face.a ], skinWeights[ face.b ], skinWeights[ face.c ] );

                        }

                }

                this.computeGroups( geometry );

                this.verticesNeedUpdate = geometry.verticesNeedUpdate;
                this.normalsNeedUpdate = geometry.normalsNeedUpdate;
                this.colorsNeedUpdate = geometry.colorsNeedUpdate;
                this.uvsNeedUpdate = geometry.uvsNeedUpdate;
                this.groupsNeedUpdate = geometry.groupsNeedUpdate;

                if ( geometry.boundingSphere !== null ) {

                        this.boundingSphere = geometry.boundingSphere.clone();

                }

                if ( geometry.boundingBox !== null ) {

                        this.boundingBox = geometry.boundingBox.clone();

                }

                return this;

        }

}

function arrayMax( array ) {

        if ( array.length === 0 ) return - Infinity;

        let max = array[ 0 ];

        for ( let i = 1, l = array.length; i < l; ++ i ) {

                if ( array[ i ] > max ) max = array[ i ];

        }

        return max;

}

const TYPED_ARRAYS = {
        Int8Array: Int8Array,
        Uint8Array: Uint8Array,
        // Workaround for IE11 pre KB2929437. See #11440
        Uint8ClampedArray: typeof Uint8ClampedArray !== 'undefined' ? Uint8ClampedArray : Uint8Array,
        Int16Array: Int16Array,
        Uint16Array: Uint16Array,
        Int32Array: Int32Array,
        Uint32Array: Uint32Array,
        Float32Array: Float32Array,
        Float64Array: Float64Array
};

function getTypedArray( type, buffer ) {

        return new TYPED_ARRAYS[ type ]( buffer );

}

let _bufferGeometryId = 1; // BufferGeometry uses odd numbers as Id

const _m1$2 = new Matrix4();
const _obj = new Object3D();
const _offset = new Vector3();
const _box$2 = new Box3();
const _boxMorphTargets = new Box3();
const _vector$4 = new Vector3();

function BufferGeometry() {

        Object.defineProperty( this, 'id', { value: _bufferGeometryId += 2 } );

        this.uuid = MathUtils.generateUUID();

        this.name = '';
        this.type = 'BufferGeometry';

        this.index = null;
        this.attributes = {};

        this.morphAttributes = {};
        this.morphTargetsRelative = false;

        this.groups = [];

        this.boundingBox = null;
        this.boundingSphere = null;

        this.drawRange = { start: 0, count: Infinity };

        this.userData = {};

}

BufferGeometry.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

        constructor: BufferGeometry,

        isBufferGeometry: true,

        getIndex: function () {

                return this.index;

        },

        setIndex: function ( index ) {

                if ( Array.isArray( index ) ) {

                        this.index = new ( arrayMax( index ) > 65535 ? Uint32BufferAttribute : Uint16BufferAttribute )( index, 1 );

                } else {

                        this.index = index;

                }

                return this;

        },

        getAttribute: function ( name ) {

                return this.attributes[ name ];

        },

        setAttribute: function ( name, attribute ) {

                this.attributes[ name ] = attribute;

                return this;

        },

        deleteAttribute: function ( name ) {

                delete this.attributes[ name ];

                return this;

        },

        hasAttribute: function ( name ) {

                return this.attributes[ name ] !== undefined;

        },

        addGroup: function ( start, count, materialIndex = 0 ) {

                this.groups.push( {

                        start: start,
                        count: count,
                        materialIndex: materialIndex

                } );

        },

        clearGroups: function () {

                this.groups = [];

        },

        setDrawRange: function ( start, count ) {

                this.drawRange.start = start;
                this.drawRange.count = count;

        },

        applyMatrix4: function ( matrix ) {

                const position = this.attributes.position;

                if ( position !== undefined ) {

                        position.applyMatrix4( matrix );

                        position.needsUpdate = true;

                }

                const normal = this.attributes.normal;

                if ( normal !== undefined ) {

                        const normalMatrix = new Matrix3().getNormalMatrix( matrix );

                        normal.applyNormalMatrix( normalMatrix );

                        normal.needsUpdate = true;

                }

                const tangent = this.attributes.tangent;

                if ( tangent !== undefined ) {

                        tangent.transformDirection( matrix );

                        tangent.needsUpdate = true;

                }

                if ( this.boundingBox !== null ) {

                        this.computeBoundingBox();

                }

                if ( this.boundingSphere !== null ) {

                        this.computeBoundingSphere();

                }

                return this;

        },

        rotateX: function ( angle ) {

                // rotate geometry around world x-axis

                _m1$2.makeRotationX( angle );

                this.applyMatrix4( _m1$2 );

                return this;

        },

        rotateY: function ( angle ) {

                // rotate geometry around world y-axis

                _m1$2.makeRotationY( angle );

                this.applyMatrix4( _m1$2 );

                return this;

        },

        rotateZ: function ( angle ) {

                // rotate geometry around world z-axis

                _m1$2.makeRotationZ( angle );

                this.applyMatrix4( _m1$2 );

                return this;

        },

        translate: function ( x, y, z ) {

                // translate geometry

                _m1$2.makeTranslation( x, y, z );

                this.applyMatrix4( _m1$2 );

                return this;

        },

        scale: function ( x, y, z ) {

                // scale geometry

                _m1$2.makeScale( x, y, z );

                this.applyMatrix4( _m1$2 );

                return this;

        },

        lookAt: function ( vector ) {

                _obj.lookAt( vector );

                _obj.updateMatrix();

                this.applyMatrix4( _obj.matrix );

                return this;

        },

        center: function () {

                this.computeBoundingBox();

                this.boundingBox.getCenter( _offset ).negate();

                this.translate( _offset.x, _offset.y, _offset.z );

                return this;

        },

        setFromObject: function ( object ) {

                // console.log( 'THREE.BufferGeometry.setFromObject(). Converting', object, this );

                const geometry = object.geometry;

                if ( object.isPoints || object.isLine ) {

                        const positions = new Float32BufferAttribute( geometry.vertices.length * 3, 3 );
                        const colors = new Float32BufferAttribute( geometry.colors.length * 3, 3 );

                        this.setAttribute( 'position', positions.copyVector3sArray( geometry.vertices ) );
                        this.setAttribute( 'color', colors.copyColorsArray( geometry.colors ) );

                        if ( geometry.lineDistances && geometry.lineDistances.length === geometry.vertices.length ) {

                                const lineDistances = new Float32BufferAttribute( geometry.lineDistances.length, 1 );

                                this.setAttribute( 'lineDistance', lineDistances.copyArray( geometry.lineDistances ) );

                        }

                        if ( geometry.boundingSphere !== null ) {

                                this.boundingSphere = geometry.boundingSphere.clone();

                        }

                        if ( geometry.boundingBox !== null ) {

                                this.boundingBox = geometry.boundingBox.clone();

                        }

                } else if ( object.isMesh ) {

                        if ( geometry && geometry.isGeometry ) {

                                this.fromGeometry( geometry );

                        }

                }

                return this;

        },

        setFromPoints: function ( points ) {

                const position = [];

                for ( let i = 0, l = points.length; i < l; i ++ ) {

                        const point = points[ i ];
                        position.push( point.x, point.y, point.z || 0 );

                }

                this.setAttribute( 'position', new Float32BufferAttribute( position, 3 ) );

                return this;

        },

        updateFromObject: function ( object ) {

                let geometry = object.geometry;

                if ( object.isMesh ) {

                        let direct = geometry.__directGeometry;

                        if ( geometry.elementsNeedUpdate === true ) {

                                direct = undefined;
                                geometry.elementsNeedUpdate = false;

                        }

                        if ( direct === undefined ) {

                                return this.fromGeometry( geometry );

                        }

                        direct.verticesNeedUpdate = geometry.verticesNeedUpdate;
                        direct.normalsNeedUpdate = geometry.normalsNeedUpdate;
                        direct.colorsNeedUpdate = geometry.colorsNeedUpdate;
                        direct.uvsNeedUpdate = geometry.uvsNeedUpdate;
                        direct.groupsNeedUpdate = geometry.groupsNeedUpdate;

                        geometry.verticesNeedUpdate = false;
                        geometry.normalsNeedUpdate = false;
                        geometry.colorsNeedUpdate = false;
                        geometry.uvsNeedUpdate = false;
                        geometry.groupsNeedUpdate = false;

                        geometry = direct;

                }

                if ( geometry.verticesNeedUpdate === true ) {

                        const attribute = this.attributes.position;

                        if ( attribute !== undefined ) {

                                attribute.copyVector3sArray( geometry.vertices );
                                attribute.needsUpdate = true;

                        }

                        geometry.verticesNeedUpdate = false;

                }

                if ( geometry.normalsNeedUpdate === true ) {

                        const attribute = this.attributes.normal;

                        if ( attribute !== undefined ) {

                                attribute.copyVector3sArray( geometry.normals );
                                attribute.needsUpdate = true;

                        }

                        geometry.normalsNeedUpdate = false;

                }

                if ( geometry.colorsNeedUpdate === true ) {

                        const attribute = this.attributes.color;

                        if ( attribute !== undefined ) {

                                attribute.copyColorsArray( geometry.colors );
                                attribute.needsUpdate = true;

                        }

                        geometry.colorsNeedUpdate = false;

                }

                if ( geometry.uvsNeedUpdate ) {

                        const attribute = this.attributes.uv;

                        if ( attribute !== undefined ) {

                                attribute.copyVector2sArray( geometry.uvs );
                                attribute.needsUpdate = true;

                        }

                        geometry.uvsNeedUpdate = false;

                }

                if ( geometry.lineDistancesNeedUpdate ) {

                        const attribute = this.attributes.lineDistance;

                        if ( attribute !== undefined ) {

                                attribute.copyArray( geometry.lineDistances );
                                attribute.needsUpdate = true;

                        }

                        geometry.lineDistancesNeedUpdate = false;

                }

                if ( geometry.groupsNeedUpdate ) {

                        geometry.computeGroups( object.geometry );
                        this.groups = geometry.groups;

                        geometry.groupsNeedUpdate = false;

                }

                return this;

        },

        fromGeometry: function ( geometry ) {

                geometry.__directGeometry = new DirectGeometry().fromGeometry( geometry );

                return this.fromDirectGeometry( geometry.__directGeometry );

        },

        fromDirectGeometry: function ( geometry ) {

                const positions = new Float32Array( geometry.vertices.length * 3 );
                this.setAttribute( 'position', new BufferAttribute( positions, 3 ).copyVector3sArray( geometry.vertices ) );

                if ( geometry.normals.length > 0 ) {

                        const normals = new Float32Array( geometry.normals.length * 3 );
                        this.setAttribute( 'normal', new BufferAttribute( normals, 3 ).copyVector3sArray( geometry.normals ) );

                }

                if ( geometry.colors.length > 0 ) {

                        const colors = new Float32Array( geometry.colors.length * 3 );
                        this.setAttribute( 'color', new BufferAttribute( colors, 3 ).copyColorsArray( geometry.colors ) );

                }

                if ( geometry.uvs.length > 0 ) {

                        const uvs = new Float32Array( geometry.uvs.length * 2 );
                        this.setAttribute( 'uv', new BufferAttribute( uvs, 2 ).copyVector2sArray( geometry.uvs ) );

                }

                if ( geometry.uvs2.length > 0 ) {

                        const uvs2 = new Float32Array( geometry.uvs2.length * 2 );
                        this.setAttribute( 'uv2', new BufferAttribute( uvs2, 2 ).copyVector2sArray( geometry.uvs2 ) );

                }

                // groups

                this.groups = geometry.groups;

                // morphs

                for ( const name in geometry.morphTargets ) {

                        const array = [];
                        const morphTargets = geometry.morphTargets[ name ];

                        for ( let i = 0, l = morphTargets.length; i < l; i ++ ) {

                                const morphTarget = morphTargets[ i ];

                                const attribute = new Float32BufferAttribute( morphTarget.data.length * 3, 3 );
                                attribute.name = morphTarget.name;

                                array.push( attribute.copyVector3sArray( morphTarget.data ) );

                        }

                        this.morphAttributes[ name ] = array;

                }

                // skinning

                if ( geometry.skinIndices.length > 0 ) {

                        const skinIndices = new Float32BufferAttribute( geometry.skinIndices.length * 4, 4 );
                        this.setAttribute( 'skinIndex', skinIndices.copyVector4sArray( geometry.skinIndices ) );

                }

                if ( geometry.skinWeights.length > 0 ) {

                        const skinWeights = new Float32BufferAttribute( geometry.skinWeights.length * 4, 4 );
                        this.setAttribute( 'skinWeight', skinWeights.copyVector4sArray( geometry.skinWeights ) );

                }

                //

                if ( geometry.boundingSphere !== null ) {

                        this.boundingSphere = geometry.boundingSphere.clone();

                }

                if ( geometry.boundingBox !== null ) {

                        this.boundingBox = geometry.boundingBox.clone();

                }

                return this;

        },

        computeBoundingBox: function () {

                if ( this.boundingBox === null ) {

                        this.boundingBox = new Box3();

                }

                const position = this.attributes.position;
                const morphAttributesPosition = this.morphAttributes.position;

                if ( position && position.isGLBufferAttribute ) {

                        console.error( 'THREE.BufferGeometry.computeBoundingBox(): GLBufferAttribute requires a manual bounding box. Alternatively set "mesh.frustumCulled" to "false".', this );

                        this.boundingBox.set(
                                new Vector3( - Infinity, - Infinity, - Infinity ),
                                new Vector3( + Infinity, + Infinity, + Infinity )
                        );

                        return;

                }

                if ( position !== undefined ) {

                        this.boundingBox.setFromBufferAttribute( position );

                        // process morph attributes if present

                        if ( morphAttributesPosition ) {

                                for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

                                        const morphAttribute = morphAttributesPosition[ i ];
                                        _box$2.setFromBufferAttribute( morphAttribute );

                                        if ( this.morphTargetsRelative ) {

                                                _vector$4.addVectors( this.boundingBox.min, _box$2.min );
                                                this.boundingBox.expandByPoint( _vector$4 );

                                                _vector$4.addVectors( this.boundingBox.max, _box$2.max );
                                                this.boundingBox.expandByPoint( _vector$4 );

                                        } else {

                                                this.boundingBox.expandByPoint( _box$2.min );
                                                this.boundingBox.expandByPoint( _box$2.max );

                                        }

                                }

                        }

                } else {

                        this.boundingBox.makeEmpty();

                }

                if ( isNaN( this.boundingBox.min.x ) || isNaN( this.boundingBox.min.y ) || isNaN( this.boundingBox.min.z ) ) {

                        console.error( 'THREE.BufferGeometry.computeBoundingBox(): Computed min/max have NaN values. The "position" attribute is likely to have NaN values.', this );

                }

        },

        computeBoundingSphere: function () {

                if ( this.boundingSphere === null ) {

                        this.boundingSphere = new Sphere();

                }

                const position = this.attributes.position;
                const morphAttributesPosition = this.morphAttributes.position;

                if ( position && position.isGLBufferAttribute ) {

                        console.error( 'THREE.BufferGeometry.computeBoundingSphere(): GLBufferAttribute requires a manual bounding sphere. Alternatively set "mesh.frustumCulled" to "false".', this );

                        this.boundingSphere.set( new Vector3(), Infinity );

                        return;

                }

                if ( position ) {

                        // first, find the center of the bounding sphere

                        const center = this.boundingSphere.center;

                        _box$2.setFromBufferAttribute( position );

                        // process morph attributes if present

                        if ( morphAttributesPosition ) {

                                for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

                                        const morphAttribute = morphAttributesPosition[ i ];
                                        _boxMorphTargets.setFromBufferAttribute( morphAttribute );

                                        if ( this.morphTargetsRelative ) {

                                                _vector$4.addVectors( _box$2.min, _boxMorphTargets.min );
                                                _box$2.expandByPoint( _vector$4 );

                                                _vector$4.addVectors( _box$2.max, _boxMorphTargets.max );
                                                _box$2.expandByPoint( _vector$4 );

                                        } else {

                                                _box$2.expandByPoint( _boxMorphTargets.min );
                                                _box$2.expandByPoint( _boxMorphTargets.max );

                                        }

                                }

                        }

                        _box$2.getCenter( center );

                        // second, try to find a boundingSphere with a radius smaller than the
                        // boundingSphere of the boundingBox: sqrt(3) smaller in the best case

                        let maxRadiusSq = 0;

                        for ( let i = 0, il = position.count; i < il; i ++ ) {

                                _vector$4.fromBufferAttribute( position, i );

                                maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector$4 ) );

                        }

                        // process morph attributes if present

                        if ( morphAttributesPosition ) {

                                for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

                                        const morphAttribute = morphAttributesPosition[ i ];
                                        const morphTargetsRelative = this.morphTargetsRelative;

                                        for ( let j = 0, jl = morphAttribute.count; j < jl; j ++ ) {

                                                _vector$4.fromBufferAttribute( morphAttribute, j );

                                                if ( morphTargetsRelative ) {

                                                        _offset.fromBufferAttribute( position, j );
                                                        _vector$4.add( _offset );

                                                }

                                                maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector$4 ) );

                                        }

                                }

                        }

                        this.boundingSphere.radius = Math.sqrt( maxRadiusSq );

                        if ( isNaN( this.boundingSphere.radius ) ) {

                                console.error( 'THREE.BufferGeometry.computeBoundingSphere(): Computed radius is NaN. The "position" attribute is likely to have NaN values.', this );

                        }

                }

        },

        computeFaceNormals: function () {

                // backwards compatibility

        },

        computeVertexNormals: function () {

                const index = this.index;
                const positionAttribute = this.getAttribute( 'position' );

                if ( positionAttribute !== undefined ) {

                        let normalAttribute = this.getAttribute( 'normal' );

                        if ( normalAttribute === undefined ) {

                                normalAttribute = new BufferAttribute( new Float32Array( positionAttribute.count * 3 ), 3 );
                                this.setAttribute( 'normal', normalAttribute );

                        } else {

                                // reset existing normals to zero

                                for ( let i = 0, il = normalAttribute.count; i < il; i ++ ) {

                                        normalAttribute.setXYZ( i, 0, 0, 0 );

                                }

                        }

                        const pA = new Vector3(), pB = new Vector3(), pC = new Vector3();
                        const nA = new Vector3(), nB = new Vector3(), nC = new Vector3();
                        const cb = new Vector3(), ab = new Vector3();

                        // indexed elements

                        if ( index ) {

                                for ( let i = 0, il = index.count; i < il; i += 3 ) {

                                        const vA = index.getX( i + 0 );
                                        const vB = index.getX( i + 1 );
                                        const vC = index.getX( i + 2 );

                                        pA.fromBufferAttribute( positionAttribute, vA );
                                        pB.fromBufferAttribute( positionAttribute, vB );
                                        pC.fromBufferAttribute( positionAttribute, vC );

                                        cb.subVectors( pC, pB );
                                        ab.subVectors( pA, pB );
                                        cb.cross( ab );

                                        nA.fromBufferAttribute( normalAttribute, vA );
                                        nB.fromBufferAttribute( normalAttribute, vB );
                                        nC.fromBufferAttribute( normalAttribute, vC );

                                        nA.add( cb );
                                        nB.add( cb );
                                        nC.add( cb );

                                        normalAttribute.setXYZ( vA, nA.x, nA.y, nA.z );
                                        normalAttribute.setXYZ( vB, nB.x, nB.y, nB.z );
                                        normalAttribute.setXYZ( vC, nC.x, nC.y, nC.z );

                                }

                        } else {

                                // non-indexed elements (unconnected triangle soup)

                                for ( let i = 0, il = positionAttribute.count; i < il; i += 3 ) {

                                        pA.fromBufferAttribute( positionAttribute, i + 0 );
                                        pB.fromBufferAttribute( positionAttribute, i + 1 );
                                        pC.fromBufferAttribute( positionAttribute, i + 2 );

                                        cb.subVectors( pC, pB );
                                        ab.subVectors( pA, pB );
                                        cb.cross( ab );

                                        normalAttribute.setXYZ( i + 0, cb.x, cb.y, cb.z );
                                        normalAttribute.setXYZ( i + 1, cb.x, cb.y, cb.z );
                                        normalAttribute.setXYZ( i + 2, cb.x, cb.y, cb.z );

                                }

                        }

                        this.normalizeNormals();

                        normalAttribute.needsUpdate = true;

                }

        },

        merge: function ( geometry, offset ) {

                if ( ! ( geometry && geometry.isBufferGeometry ) ) {

                        console.error( 'THREE.BufferGeometry.merge(): geometry not an instance of THREE.BufferGeometry.', geometry );
                        return;

                }

                if ( offset === undefined ) {

                        offset = 0;

                        console.warn(
                                'THREE.BufferGeometry.merge(): Overwriting original geometry, starting at offset=0. '
                                + 'Use BufferGeometryUtils.mergeBufferGeometries() for lossless merge.'
                        );

                }

                const attributes = this.attributes;

                for ( const key in attributes ) {

                        if ( geometry.attributes[ key ] === undefined ) continue;

                        const attribute1 = attributes[ key ];
                        const attributeArray1 = attribute1.array;

                        const attribute2 = geometry.attributes[ key ];
                        const attributeArray2 = attribute2.array;

                        const attributeOffset = attribute2.itemSize * offset;
                        const length = Math.min( attributeArray2.length, attributeArray1.length - attributeOffset );

                        for ( let i = 0, j = attributeOffset; i < length; i ++, j ++ ) {

                                attributeArray1[ j ] = attributeArray2[ i ];

                        }

                }

                return this;

        },

        normalizeNormals: function () {

                const normals = this.attributes.normal;

                for ( let i = 0, il = normals.count; i < il; i ++ ) {

                        _vector$4.fromBufferAttribute( normals, i );

                        _vector$4.normalize();

                        normals.setXYZ( i, _vector$4.x, _vector$4.y, _vector$4.z );

                }

        },

        toNonIndexed: function () {

                function convertBufferAttribute( attribute, indices ) {

                        const array = attribute.array;
                        const itemSize = attribute.itemSize;
                        const normalized = attribute.normalized;

                        const array2 = new array.constructor( indices.length * itemSize );

                        let index = 0, index2 = 0;

                        for ( let i = 0, l = indices.length; i < l; i ++ ) {

                                index = indices[ i ] * itemSize;

                                for ( let j = 0; j < itemSize; j ++ ) {

                                        array2[ index2 ++ ] = array[ index ++ ];

                                }

                        }

                        return new BufferAttribute( array2, itemSize, normalized );

                }

                //

                if ( this.index === null ) {

                        console.warn( 'THREE.BufferGeometry.toNonIndexed(): Geometry is already non-indexed.' );
                        return this;

                }

                const geometry2 = new BufferGeometry();

                const indices = this.index.array;
                const attributes = this.attributes;

                // attributes

                for ( const name in attributes ) {

                        const attribute = attributes[ name ];

                        const newAttribute = convertBufferAttribute( attribute, indices );

                        geometry2.setAttribute( name, newAttribute );

                }

                // morph attributes

                const morphAttributes = this.morphAttributes;

                for ( const name in morphAttributes ) {

                        const morphArray = [];
                        const morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes

                        for ( let i = 0, il = morphAttribute.length; i < il; i ++ ) {

                                const attribute = morphAttribute[ i ];

                                const newAttribute = convertBufferAttribute( attribute, indices );

                                morphArray.push( newAttribute );

                        }

                        geometry2.morphAttributes[ name ] = morphArray;

                }

                geometry2.morphTargetsRelative = this.morphTargetsRelative;

                // groups

                const groups = this.groups;

                for ( let i = 0, l = groups.length; i < l; i ++ ) {

                        const group = groups[ i ];
                        geometry2.addGroup( group.start, group.count, group.materialIndex );

                }

                return geometry2;

        },

        toJSON: function () {

                const data = {
                        metadata: {
                                version: 4.5,
                                type: 'BufferGeometry',
                                generator: 'BufferGeometry.toJSON'
                        }
                };

                // standard BufferGeometry serialization

                data.uuid = this.uuid;
                data.type = this.type;
                if ( this.name !== '' ) data.name = this.name;
                if ( Object.keys( this.userData ).length > 0 ) data.userData = this.userData;

                if ( this.parameters !== undefined ) {

                        const parameters = this.parameters;

                        for ( const key in parameters ) {

                                if ( parameters[ key ] !== undefined ) data[ key ] = parameters[ key ];

                        }

                        return data;

                }

                data.data = { attributes: {} };

                const index = this.index;

                if ( index !== null ) {

                        data.data.index = {
                                type: index.array.constructor.name,
                                array: Array.prototype.slice.call( index.array )
                        };

                }

                const attributes = this.attributes;

                for ( const key in attributes ) {

                        const attribute = attributes[ key ];

                        const attributeData = attribute.toJSON( data.data );

                        if ( attribute.name !== '' ) attributeData.name = attribute.name;

                        data.data.attributes[ key ] = attributeData;

                }

                const morphAttributes = {};
                let hasMorphAttributes = false;

                for ( const key in this.morphAttributes ) {

                        const attributeArray = this.morphAttributes[ key ];

                        const array = [];

                        for ( let i = 0, il = attributeArray.length; i < il; i ++ ) {

                                const attribute = attributeArray[ i ];

                                const attributeData = attribute.toJSON( data.data );

                                if ( attribute.name !== '' ) attributeData.name = attribute.name;

                                array.push( attributeData );

                        }

                        if ( array.length > 0 ) {

                                morphAttributes[ key ] = array;

                                hasMorphAttributes = true;

                        }

                }

                if ( hasMorphAttributes ) {

                        data.data.morphAttributes = morphAttributes;
                        data.data.morphTargetsRelative = this.morphTargetsRelative;

                }

                const groups = this.groups;

                if ( groups.length > 0 ) {

                        data.data.groups = JSON.parse( JSON.stringify( groups ) );

                }

                const boundingSphere = this.boundingSphere;

                if ( boundingSphere !== null ) {

                        data.data.boundingSphere = {
                                center: boundingSphere.center.toArray(),
                                radius: boundingSphere.radius
                        };

                }

                return data;

        },

        clone: function () {

                /*
                 // Handle primitives

                 const parameters = this.parameters;

                 if ( parameters !== undefined ) {

                 const values = [];

                 for ( const key in parameters ) {

                 values.push( parameters[ key ] );

                 }

                 const geometry = Object.create( this.constructor.prototype );
                 this.constructor.apply( geometry, values );
                 return geometry;

                 }

                 return new this.constructor().copy( this );
                 */

                return new BufferGeometry().copy( this );

        },

        copy: function ( source ) {

                // reset

                this.index = null;
                this.attributes = {};
                this.morphAttributes = {};
                this.groups = [];
                this.boundingBox = null;
                this.boundingSphere = null;

                // used for storing cloned, shared data

                const data = {};

                // name

                this.name = source.name;

                // index

                const index = source.index;

                if ( index !== null ) {

                        this.setIndex( index.clone( data ) );

                }

                // attributes

                const attributes = source.attributes;

                for ( const name in attributes ) {

                        const attribute = attributes[ name ];
                        this.setAttribute( name, attribute.clone( data ) );

                }

                // morph attributes

                const morphAttributes = source.morphAttributes;

                for ( const name in morphAttributes ) {

                        const array = [];
                        const morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes

                        for ( let i = 0, l = morphAttribute.length; i < l; i ++ ) {

                                array.push( morphAttribute[ i ].clone( data ) );

                        }

                        this.morphAttributes[ name ] = array;

                }

                this.morphTargetsRelative = source.morphTargetsRelative;

                // groups

                const groups = source.groups;

                for ( let i = 0, l = groups.length; i < l; i ++ ) {

                        const group = groups[ i ];
                        this.addGroup( group.start, group.count, group.materialIndex );

                }

                // bounding box

                const boundingBox = source.boundingBox;

                if ( boundingBox !== null ) {

                        this.boundingBox = boundingBox.clone();

                }

                // bounding sphere

                const boundingSphere = source.boundingSphere;

                if ( boundingSphere !== null ) {

                        this.boundingSphere = boundingSphere.clone();

                }

                // draw range

                this.drawRange.start = source.drawRange.start;
                this.drawRange.count = source.drawRange.count;

                // user data

                this.userData = source.userData;

                return this;

        },

        dispose: function () {

                this.dispatchEvent( { type: 'dispose' } );

        }

} );

const _inverseMatrix = new Matrix4();
const _ray = new Ray();
const _sphere = new Sphere();

const _vA = new Vector3();
const _vB = new Vector3();
const _vC = new Vector3();

const _tempA = new Vector3();
const _tempB = new Vector3();
const _tempC = new Vector3();

const _morphA = new Vector3();
const _morphB = new Vector3();
const _morphC = new Vector3();

const _uvA = new Vector2();
const _uvB = new Vector2();
const _uvC = new Vector2();

const _intersectionPoint = new Vector3();
const _intersectionPointWorld = new Vector3();

function Mesh( geometry, material ) {

        Object3D.call( this );

        this.type = 'Mesh';

        this.geometry = geometry !== undefined ? geometry : new BufferGeometry();
        this.material = material !== undefined ? material : new MeshBasicMaterial();

        this.updateMorphTargets();

}

Mesh.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: Mesh,

        isMesh: true,

        copy: function ( source ) {

                Object3D.prototype.copy.call( this, source );

                if ( source.morphTargetInfluences !== undefined ) {

                        this.morphTargetInfluences = source.morphTargetInfluences.slice();

                }

                if ( source.morphTargetDictionary !== undefined ) {

                        this.morphTargetDictionary = Object.assign( {}, source.morphTargetDictionary );

                }

                this.material = source.material;
                this.geometry = source.geometry;

                return this;

        },

        updateMorphTargets: function () {

                const geometry = this.geometry;

                if ( geometry.isBufferGeometry ) {

                        const morphAttributes = geometry.morphAttributes;
                        const keys = Object.keys( morphAttributes );

                        if ( keys.length > 0 ) {

                                const morphAttribute = morphAttributes[ keys[ 0 ] ];

                                if ( morphAttribute !== undefined ) {

                                        this.morphTargetInfluences = [];
                                        this.morphTargetDictionary = {};

                                        for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {

                                                const name = morphAttribute[ m ].name || String( m );

                                                this.morphTargetInfluences.push( 0 );
                                                this.morphTargetDictionary[ name ] = m;

                                        }

                                }

                        }

                } else {

                        const morphTargets = geometry.morphTargets;

                        if ( morphTargets !== undefined && morphTargets.length > 0 ) {

                                console.error( 'THREE.Mesh.updateMorphTargets() no longer supports THREE.Geometry. Use THREE.BufferGeometry instead.' );

                        }

                }

        },

        raycast: function ( raycaster, intersects ) {

                const geometry = this.geometry;
                const material = this.material;
                const matrixWorld = this.matrixWorld;

                if ( material === undefined ) return;

                // Checking boundingSphere distance to ray

                if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

                _sphere.copy( geometry.boundingSphere );
                _sphere.applyMatrix4( matrixWorld );

                if ( raycaster.ray.intersectsSphere( _sphere ) === false ) return;

                //

                _inverseMatrix.copy( matrixWorld ).invert();
                _ray.copy( raycaster.ray ).applyMatrix4( _inverseMatrix );

                // Check boundingBox before continuing

                if ( geometry.boundingBox !== null ) {

                        if ( _ray.intersectsBox( geometry.boundingBox ) === false ) return;

                }

                let intersection;

                if ( geometry.isBufferGeometry ) {

                        const index = geometry.index;
                        const position = geometry.attributes.position;
                        const morphPosition = geometry.morphAttributes.position;
                        const morphTargetsRelative = geometry.morphTargetsRelative;
                        const uv = geometry.attributes.uv;
                        const uv2 = geometry.attributes.uv2;
                        const groups = geometry.groups;
                        const drawRange = geometry.drawRange;

                        if ( index !== null ) {

                                // indexed buffer geometry

                                if ( Array.isArray( material ) ) {

                                        for ( let i = 0, il = groups.length; i < il; i ++ ) {

                                                const group = groups[ i ];
                                                const groupMaterial = material[ group.materialIndex ];

                                                const start = Math.max( group.start, drawRange.start );
                                                const end = Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) );

                                                for ( let j = start, jl = end; j < jl; j += 3 ) {

                                                        const a = index.getX( j );
                                                        const b = index.getX( j + 1 );
                                                        const c = index.getX( j + 2 );

                                                        intersection = checkBufferGeometryIntersection( this, groupMaterial, raycaster, _ray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c );

                                                        if ( intersection ) {

                                                                intersection.faceIndex = Math.floor( j / 3 ); // triangle number in indexed buffer semantics
                                                                intersection.face.materialIndex = group.materialIndex;
                                                                intersects.push( intersection );

                                                        }

                                                }

                                        }

                                } else {

                                        const start = Math.max( 0, drawRange.start );
                                        const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );

                                        for ( let i = start, il = end; i < il; i += 3 ) {

                                                const a = index.getX( i );
                                                const b = index.getX( i + 1 );
                                                const c = index.getX( i + 2 );

                                                intersection = checkBufferGeometryIntersection( this, material, raycaster, _ray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c );

                                                if ( intersection ) {

                                                        intersection.faceIndex = Math.floor( i / 3 ); // triangle number in indexed buffer semantics
                                                        intersects.push( intersection );

                                                }

                                        }

                                }

                        } else if ( position !== undefined ) {

                                // non-indexed buffer geometry

                                if ( Array.isArray( material ) ) {

                                        for ( let i = 0, il = groups.length; i < il; i ++ ) {

                                                const group = groups[ i ];
                                                const groupMaterial = material[ group.materialIndex ];

                                                const start = Math.max( group.start, drawRange.start );
                                                const end = Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) );

                                                for ( let j = start, jl = end; j < jl; j += 3 ) {

                                                        const a = j;
                                                        const b = j + 1;
                                                        const c = j + 2;

                                                        intersection = checkBufferGeometryIntersection( this, groupMaterial, raycaster, _ray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c );

                                                        if ( intersection ) {

                                                                intersection.faceIndex = Math.floor( j / 3 ); // triangle number in non-indexed buffer semantics
                                                                intersection.face.materialIndex = group.materialIndex;
                                                                intersects.push( intersection );

                                                        }

                                                }

                                        }

                                } else {

                                        const start = Math.max( 0, drawRange.start );
                                        const end = Math.min( position.count, ( drawRange.start + drawRange.count ) );

                                        for ( let i = start, il = end; i < il; i += 3 ) {

                                                const a = i;
                                                const b = i + 1;
                                                const c = i + 2;

                                                intersection = checkBufferGeometryIntersection( this, material, raycaster, _ray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c );

                                                if ( intersection ) {

                                                        intersection.faceIndex = Math.floor( i / 3 ); // triangle number in non-indexed buffer semantics
                                                        intersects.push( intersection );

                                                }

                                        }

                                }

                        }

                } else if ( geometry.isGeometry ) {

                        const isMultiMaterial = Array.isArray( material );

                        const vertices = geometry.vertices;
                        const faces = geometry.faces;
                        let uvs;

                        const faceVertexUvs = geometry.faceVertexUvs[ 0 ];
                        if ( faceVertexUvs.length > 0 ) uvs = faceVertexUvs;

                        for ( let f = 0, fl = faces.length; f < fl; f ++ ) {

                                const face = faces[ f ];
                                const faceMaterial = isMultiMaterial ? material[ face.materialIndex ] : material;

                                if ( faceMaterial === undefined ) continue;

                                const fvA = vertices[ face.a ];
                                const fvB = vertices[ face.b ];
                                const fvC = vertices[ face.c ];

                                intersection = checkIntersection( this, faceMaterial, raycaster, _ray, fvA, fvB, fvC, _intersectionPoint );

                                if ( intersection ) {

                                        if ( uvs && uvs[ f ] ) {

                                                const uvs_f = uvs[ f ];
                                                _uvA.copy( uvs_f[ 0 ] );
                                                _uvB.copy( uvs_f[ 1 ] );
                                                _uvC.copy( uvs_f[ 2 ] );

                                                intersection.uv = Triangle.getUV( _intersectionPoint, fvA, fvB, fvC, _uvA, _uvB, _uvC, new Vector2() );

                                        }

                                        intersection.face = face;
                                        intersection.faceIndex = f;
                                        intersects.push( intersection );

                                }

                        }

                }

        }

} );

function checkIntersection( object, material, raycaster, ray, pA, pB, pC, point ) {

        let intersect;

        if ( material.side === BackSide ) {

                intersect = ray.intersectTriangle( pC, pB, pA, true, point );

        } else {

                intersect = ray.intersectTriangle( pA, pB, pC, material.side !== DoubleSide, point );

        }

        if ( intersect === null ) return null;

        _intersectionPointWorld.copy( point );
        _intersectionPointWorld.applyMatrix4( object.matrixWorld );

        const distance = raycaster.ray.origin.distanceTo( _intersectionPointWorld );

        if ( distance < raycaster.near || distance > raycaster.far ) return null;

        return {
                distance: distance,
                point: _intersectionPointWorld.clone(),
                object: object
        };

}

function checkBufferGeometryIntersection( object, material, raycaster, ray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c ) {

        _vA.fromBufferAttribute( position, a );
        _vB.fromBufferAttribute( position, b );
        _vC.fromBufferAttribute( position, c );

        const morphInfluences = object.morphTargetInfluences;

        if ( material.morphTargets && morphPosition && morphInfluences ) {

                _morphA.set( 0, 0, 0 );
                _morphB.set( 0, 0, 0 );
                _morphC.set( 0, 0, 0 );

                for ( let i = 0, il = morphPosition.length; i < il; i ++ ) {

                        const influence = morphInfluences[ i ];
                        const morphAttribute = morphPosition[ i ];

                        if ( influence === 0 ) continue;

                        _tempA.fromBufferAttribute( morphAttribute, a );
                        _tempB.fromBufferAttribute( morphAttribute, b );
                        _tempC.fromBufferAttribute( morphAttribute, c );

                        if ( morphTargetsRelative ) {

                                _morphA.addScaledVector( _tempA, influence );
                                _morphB.addScaledVector( _tempB, influence );
                                _morphC.addScaledVector( _tempC, influence );

                        } else {

                                _morphA.addScaledVector( _tempA.sub( _vA ), influence );
                                _morphB.addScaledVector( _tempB.sub( _vB ), influence );
                                _morphC.addScaledVector( _tempC.sub( _vC ), influence );

                        }

                }

                _vA.add( _morphA );
                _vB.add( _morphB );
                _vC.add( _morphC );

        }

        if ( object.isSkinnedMesh ) {

                object.boneTransform( a, _vA );
                object.boneTransform( b, _vB );
                object.boneTransform( c, _vC );

        }

        const intersection = checkIntersection( object, material, raycaster, ray, _vA, _vB, _vC, _intersectionPoint );

        if ( intersection ) {

                if ( uv ) {

                        _uvA.fromBufferAttribute( uv, a );
                        _uvB.fromBufferAttribute( uv, b );
                        _uvC.fromBufferAttribute( uv, c );

                        intersection.uv = Triangle.getUV( _intersectionPoint, _vA, _vB, _vC, _uvA, _uvB, _uvC, new Vector2() );

                }

                if ( uv2 ) {

                        _uvA.fromBufferAttribute( uv2, a );
                        _uvB.fromBufferAttribute( uv2, b );
                        _uvC.fromBufferAttribute( uv2, c );

                        intersection.uv2 = Triangle.getUV( _intersectionPoint, _vA, _vB, _vC, _uvA, _uvB, _uvC, new Vector2() );

                }

                const face = new Face3( a, b, c );
                Triangle.getNormal( _vA, _vB, _vC, face.normal );

                intersection.face = face;

        }

        return intersection;

}

class BoxBufferGeometry extends BufferGeometry {

        constructor( width = 1, height = 1, depth = 1, widthSegments = 1, heightSegments = 1, depthSegments = 1 ) {

                super();

                this.type = 'BoxBufferGeometry';

                this.parameters = {
                        width: width,
                        height: height,
                        depth: depth,
                        widthSegments: widthSegments,
                        heightSegments: heightSegments,
                        depthSegments: depthSegments
                };

                const scope = this;

                // segments

                widthSegments = Math.floor( widthSegments );
                heightSegments = Math.floor( heightSegments );
                depthSegments = Math.floor( depthSegments );

                // buffers

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                // helper variables

                let numberOfVertices = 0;
                let groupStart = 0;

                // build each side of the box geometry

                buildPlane( 'z', 'y', 'x', - 1, - 1, depth, height, width, depthSegments, heightSegments, 0 ); // px
                buildPlane( 'z', 'y', 'x', 1, - 1, depth, height, - width, depthSegments, heightSegments, 1 ); // nx
                buildPlane( 'x', 'z', 'y', 1, 1, width, depth, height, widthSegments, depthSegments, 2 ); // py
                buildPlane( 'x', 'z', 'y', 1, - 1, width, depth, - height, widthSegments, depthSegments, 3 ); // ny
                buildPlane( 'x', 'y', 'z', 1, - 1, width, height, depth, widthSegments, heightSegments, 4 ); // pz
                buildPlane( 'x', 'y', 'z', - 1, - 1, width, height, - depth, widthSegments, heightSegments, 5 ); // nz

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

                function buildPlane( u, v, w, udir, vdir, width, height, depth, gridX, gridY, materialIndex ) {

                        const segmentWidth = width / gridX;
                        const segmentHeight = height / gridY;

                        const widthHalf = width / 2;
                        const heightHalf = height / 2;
                        const depthHalf = depth / 2;

                        const gridX1 = gridX + 1;
                        const gridY1 = gridY + 1;

                        let vertexCounter = 0;
                        let groupCount = 0;

                        const vector = new Vector3();

                        // generate vertices, normals and uvs

                        for ( let iy = 0; iy < gridY1; iy ++ ) {

                                const y = iy * segmentHeight - heightHalf;

                                for ( let ix = 0; ix < gridX1; ix ++ ) {

                                        const x = ix * segmentWidth - widthHalf;

                                        // set values to correct vector component

                                        vector[ u ] = x * udir;
                                        vector[ v ] = y * vdir;
                                        vector[ w ] = depthHalf;

                                        // now apply vector to vertex buffer

                                        vertices.push( vector.x, vector.y, vector.z );

                                        // set values to correct vector component

                                        vector[ u ] = 0;
                                        vector[ v ] = 0;
                                        vector[ w ] = depth > 0 ? 1 : - 1;

                                        // now apply vector to normal buffer

                                        normals.push( vector.x, vector.y, vector.z );

                                        // uvs

                                        uvs.push( ix / gridX );
                                        uvs.push( 1 - ( iy / gridY ) );

                                        // counters

                                        vertexCounter += 1;

                                }

                        }

                        // indices

                        // 1. you need three indices to draw a single face
                        // 2. a single segment consists of two faces
                        // 3. so we need to generate six (2*3) indices per segment

                        for ( let iy = 0; iy < gridY; iy ++ ) {

                                for ( let ix = 0; ix < gridX; ix ++ ) {

                                        const a = numberOfVertices + ix + gridX1 * iy;
                                        const b = numberOfVertices + ix + gridX1 * ( iy + 1 );
                                        const c = numberOfVertices + ( ix + 1 ) + gridX1 * ( iy + 1 );
                                        const d = numberOfVertices + ( ix + 1 ) + gridX1 * iy;

                                        // faces

                                        indices.push( a, b, d );
                                        indices.push( b, c, d );

                                        // increase counter

                                        groupCount += 6;

                                }

                        }

                        // add a group to the geometry. this will ensure multi material support

                        scope.addGroup( groupStart, groupCount, materialIndex );

                        // calculate new start value for groups

                        groupStart += groupCount;

                        // update total number of vertices

                        numberOfVertices += vertexCounter;

                }

        }

}

/**
 * Uniform Utilities
 */

function cloneUniforms( src ) {

        const dst = {};

        for ( const u in src ) {

                dst[ u ] = {};

                for ( const p in src[ u ] ) {

                        const property = src[ u ][ p ];

                        if ( property && ( property.isColor ||
                                property.isMatrix3 || property.isMatrix4 ||
                                property.isVector2 || property.isVector3 || property.isVector4 ||
                                property.isTexture ) ) {

                                dst[ u ][ p ] = property.clone();

                        } else if ( Array.isArray( property ) ) {

                                dst[ u ][ p ] = property.slice();

                        } else {

                                dst[ u ][ p ] = property;

                        }

                }

        }

        return dst;

}

function mergeUniforms( uniforms ) {

        const merged = {};

        for ( let u = 0; u < uniforms.length; u ++ ) {

                const tmp = cloneUniforms( uniforms[ u ] );

                for ( const p in tmp ) {

                        merged[ p ] = tmp[ p ];

                }

        }

        return merged;

}

// Legacy

const UniformsUtils = { clone: cloneUniforms, merge: mergeUniforms };

var default_vertex = "void main() {\n\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n}";

var default_fragment = "void main() {\n\tgl_FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );\n}";

/**
 * parameters = {
 *  defines: { "label" : "value" },
 *  uniforms: { "parameter1": { value: 1.0 }, "parameter2": { value2: 2 } },
 *
 *  fragmentShader: <string>,
 *  vertexShader: <string>,
 *
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>,
 *
 *  lights: <bool>,
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>,
 *  morphNormals: <bool>
 * }
 */

function ShaderMaterial( parameters ) {

        Material.call( this );

        this.type = 'ShaderMaterial';

        this.defines = {};
        this.uniforms = {};

        this.vertexShader = default_vertex;
        this.fragmentShader = default_fragment;

        this.linewidth = 1;

        this.wireframe = false;
        this.wireframeLinewidth = 1;

        this.fog = false; // set to use scene fog
        this.lights = false; // set to use scene lights
        this.clipping = false; // set to use user-defined clipping planes

        this.skinning = false; // set to use skinning attribute streams
        this.morphTargets = false; // set to use morph targets
        this.morphNormals = false; // set to use morph normals

        this.extensions = {
                derivatives: false, // set to use derivatives
                fragDepth: false, // set to use fragment depth values
                drawBuffers: false, // set to use draw buffers
                shaderTextureLOD: false // set to use shader texture LOD
        };

        // When rendered geometry doesn't include these attributes but the material does,
        // use these default values in WebGL. This avoids errors when buffer data is missing.
        this.defaultAttributeValues = {
                'color': [ 1, 1, 1 ],
                'uv': [ 0, 0 ],
                'uv2': [ 0, 0 ]
        };

        this.index0AttributeName = undefined;
        this.uniformsNeedUpdate = false;

        this.glslVersion = null;

        if ( parameters !== undefined ) {

                if ( parameters.attributes !== undefined ) {

                        console.error( 'THREE.ShaderMaterial: attributes should now be defined in THREE.BufferGeometry instead.' );

                }

                this.setValues( parameters );

        }

}

ShaderMaterial.prototype = Object.create( Material.prototype );
ShaderMaterial.prototype.constructor = ShaderMaterial;

ShaderMaterial.prototype.isShaderMaterial = true;

ShaderMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.fragmentShader = source.fragmentShader;
        this.vertexShader = source.vertexShader;

        this.uniforms = cloneUniforms( source.uniforms );

        this.defines = Object.assign( {}, source.defines );

        this.wireframe = source.wireframe;
        this.wireframeLinewidth = source.wireframeLinewidth;

        this.lights = source.lights;
        this.clipping = source.clipping;

        this.skinning = source.skinning;

        this.morphTargets = source.morphTargets;
        this.morphNormals = source.morphNormals;

        this.extensions = Object.assign( {}, source.extensions );

        this.glslVersion = source.glslVersion;

        return this;

};

ShaderMaterial.prototype.toJSON = function ( meta ) {

        const data = Material.prototype.toJSON.call( this, meta );

        data.glslVersion = this.glslVersion;
        data.uniforms = {};

        for ( const name in this.uniforms ) {

                const uniform = this.uniforms[ name ];
                const value = uniform.value;

                if ( value && value.isTexture ) {

                        data.uniforms[ name ] = {
                                type: 't',
                                value: value.toJSON( meta ).uuid
                        };

                } else if ( value && value.isColor ) {

                        data.uniforms[ name ] = {
                                type: 'c',
                                value: value.getHex()
                        };

                } else if ( value && value.isVector2 ) {

                        data.uniforms[ name ] = {
                                type: 'v2',
                                value: value.toArray()
                        };

                } else if ( value && value.isVector3 ) {

                        data.uniforms[ name ] = {
                                type: 'v3',
                                value: value.toArray()
                        };

                } else if ( value && value.isVector4 ) {

                        data.uniforms[ name ] = {
                                type: 'v4',
                                value: value.toArray()
                        };

                } else if ( value && value.isMatrix3 ) {

                        data.uniforms[ name ] = {
                                type: 'm3',
                                value: value.toArray()
                        };

                } else if ( value && value.isMatrix4 ) {

                        data.uniforms[ name ] = {
                                type: 'm4',
                                value: value.toArray()
                        };

                } else {

                        data.uniforms[ name ] = {
                                value: value
                        };

                        // note: the array variants v2v, v3v, v4v, m4v and tv are not supported so far

                }

        }

        if ( Object.keys( this.defines ).length > 0 ) data.defines = this.defines;

        data.vertexShader = this.vertexShader;
        data.fragmentShader = this.fragmentShader;

        const extensions = {};

        for ( const key in this.extensions ) {

                if ( this.extensions[ key ] === true ) extensions[ key ] = true;

        }

        if ( Object.keys( extensions ).length > 0 ) data.extensions = extensions;

        return data;

};

function Camera() {

        Object3D.call( this );

        this.type = 'Camera';

        this.matrixWorldInverse = new Matrix4();

        this.projectionMatrix = new Matrix4();
        this.projectionMatrixInverse = new Matrix4();

}

Camera.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: Camera,

        isCamera: true,

        copy: function ( source, recursive ) {

                Object3D.prototype.copy.call( this, source, recursive );

                this.matrixWorldInverse.copy( source.matrixWorldInverse );

                this.projectionMatrix.copy( source.projectionMatrix );
                this.projectionMatrixInverse.copy( source.projectionMatrixInverse );

                return this;

        },

        getWorldDirection: function ( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Camera: .getWorldDirection() target is now required' );
                        target = new Vector3();

                }

                this.updateWorldMatrix( true, false );

                const e = this.matrixWorld.elements;

                return target.set( - e[ 8 ], - e[ 9 ], - e[ 10 ] ).normalize();

        },

        updateMatrixWorld: function ( force ) {

                Object3D.prototype.updateMatrixWorld.call( this, force );

                this.matrixWorldInverse.copy( this.matrixWorld ).invert();

        },

        updateWorldMatrix: function ( updateParents, updateChildren ) {

                Object3D.prototype.updateWorldMatrix.call( this, updateParents, updateChildren );

                this.matrixWorldInverse.copy( this.matrixWorld ).invert();

        },

        clone: function () {

                return new this.constructor().copy( this );

        }

} );

function PerspectiveCamera( fov = 50, aspect = 1, near = 0.1, far = 2000 ) {

        Camera.call( this );

        this.type = 'PerspectiveCamera';

        this.fov = fov;
        this.zoom = 1;

        this.near = near;
        this.far = far;
        this.focus = 10;

        this.aspect = aspect;
        this.view = null;

        this.filmGauge = 35;    // width of the film (default in millimeters)
        this.filmOffset = 0;    // horizontal film offset (same unit as gauge)

        this.updateProjectionMatrix();

}

PerspectiveCamera.prototype = Object.assign( Object.create( Camera.prototype ), {

        constructor: PerspectiveCamera,

        isPerspectiveCamera: true,

        copy: function ( source, recursive ) {

                Camera.prototype.copy.call( this, source, recursive );

                this.fov = source.fov;
                this.zoom = source.zoom;

                this.near = source.near;
                this.far = source.far;
                this.focus = source.focus;

                this.aspect = source.aspect;
                this.view = source.view === null ? null : Object.assign( {}, source.view );

                this.filmGauge = source.filmGauge;
                this.filmOffset = source.filmOffset;

                return this;

        },

        /**
         * Sets the FOV by focal length in respect to the current .filmGauge.
         *
         * The default film gauge is 35, so that the focal length can be specified for
         * a 35mm (full frame) camera.
         *
         * Values for focal length and film gauge must have the same unit.
         */
        setFocalLength: function ( focalLength ) {

                // see http://www.bobatkins.com/photography/technical/field_of_view.html
                const vExtentSlope = 0.5 * this.getFilmHeight() / focalLength;

                this.fov = MathUtils.RAD2DEG * 2 * Math.atan( vExtentSlope );
                this.updateProjectionMatrix();

        },

        /**
         * Calculates the focal length from the current .fov and .filmGauge.
         */
        getFocalLength: function () {

                const vExtentSlope = Math.tan( MathUtils.DEG2RAD * 0.5 * this.fov );

                return 0.5 * this.getFilmHeight() / vExtentSlope;

        },

        getEffectiveFOV: function () {

                return MathUtils.RAD2DEG * 2 * Math.atan(
                        Math.tan( MathUtils.DEG2RAD * 0.5 * this.fov ) / this.zoom );

        },

        getFilmWidth: function () {

                // film not completely covered in portrait format (aspect < 1)
                return this.filmGauge * Math.min( this.aspect, 1 );

        },

        getFilmHeight: function () {

                // film not completely covered in landscape format (aspect > 1)
                return this.filmGauge / Math.max( this.aspect, 1 );

        },

        /**
         * Sets an offset in a larger frustum. This is useful for multi-window or
         * multi-monitor/multi-machine setups.
         *
         * For example, if you have 3x2 monitors and each monitor is 1920x1080 and
         * the monitors are in grid like this
         *
         *   +---+---+---+
         *   | A | B | C |
         *   +---+---+---+
         *   | D | E | F |
         *   +---+---+---+
         *
         * then for each monitor you would call it like this
         *
         *   const w = 1920;
         *   const h = 1080;
         *   const fullWidth = w * 3;
         *   const fullHeight = h * 2;
         *
         *   --A--
         *   camera.setViewOffset( fullWidth, fullHeight, w * 0, h * 0, w, h );
         *   --B--
         *   camera.setViewOffset( fullWidth, fullHeight, w * 1, h * 0, w, h );
         *   --C--
         *   camera.setViewOffset( fullWidth, fullHeight, w * 2, h * 0, w, h );
         *   --D--
         *   camera.setViewOffset( fullWidth, fullHeight, w * 0, h * 1, w, h );
         *   --E--
         *   camera.setViewOffset( fullWidth, fullHeight, w * 1, h * 1, w, h );
         *   --F--
         *   camera.setViewOffset( fullWidth, fullHeight, w * 2, h * 1, w, h );
         *
         *   Note there is no reason monitors have to be the same size or in a grid.
         */
        setViewOffset: function ( fullWidth, fullHeight, x, y, width, height ) {

                this.aspect = fullWidth / fullHeight;

                if ( this.view === null ) {

                        this.view = {
                                enabled: true,
                                fullWidth: 1,
                                fullHeight: 1,
                                offsetX: 0,
                                offsetY: 0,
                                width: 1,
                                height: 1
                        };

                }

                this.view.enabled = true;
                this.view.fullWidth = fullWidth;
                this.view.fullHeight = fullHeight;
                this.view.offsetX = x;
                this.view.offsetY = y;
                this.view.width = width;
                this.view.height = height;

                this.updateProjectionMatrix();

        },

        clearViewOffset: function () {

                if ( this.view !== null ) {

                        this.view.enabled = false;

                }

                this.updateProjectionMatrix();

        },

        updateProjectionMatrix: function () {

                const near = this.near;
                let top = near * Math.tan( MathUtils.DEG2RAD * 0.5 * this.fov ) / this.zoom;
                let height = 2 * top;
                let width = this.aspect * height;
                let left = - 0.5 * width;
                const view = this.view;

                if ( this.view !== null && this.view.enabled ) {

                        const fullWidth = view.fullWidth,
                                fullHeight = view.fullHeight;

                        left += view.offsetX * width / fullWidth;
                        top -= view.offsetY * height / fullHeight;
                        width *= view.width / fullWidth;
                        height *= view.height / fullHeight;

                }

                const skew = this.filmOffset;
                if ( skew !== 0 ) left += near * skew / this.getFilmWidth();

                this.projectionMatrix.makePerspective( left, left + width, top, top - height, near, this.far );

                this.projectionMatrixInverse.copy( this.projectionMatrix ).invert();

        },

        toJSON: function ( meta ) {

                const data = Object3D.prototype.toJSON.call( this, meta );

                data.object.fov = this.fov;
                data.object.zoom = this.zoom;

                data.object.near = this.near;
                data.object.far = this.far;
                data.object.focus = this.focus;

                data.object.aspect = this.aspect;

                if ( this.view !== null ) data.object.view = Object.assign( {}, this.view );

                data.object.filmGauge = this.filmGauge;
                data.object.filmOffset = this.filmOffset;

                return data;

        }

} );

const fov = 90, aspect = 1;

function CubeCamera( near, far, renderTarget ) {

        Object3D.call( this );

        this.type = 'CubeCamera';

        if ( renderTarget.isWebGLCubeRenderTarget !== true ) {

                console.error( 'THREE.CubeCamera: The constructor now expects an instance of WebGLCubeRenderTarget as third parameter.' );
                return;

        }

        this.renderTarget = renderTarget;

        const cameraPX = new PerspectiveCamera( fov, aspect, near, far );
        cameraPX.layers = this.layers;
        cameraPX.up.set( 0, - 1, 0 );
        cameraPX.lookAt( new Vector3( 1, 0, 0 ) );
        this.add( cameraPX );

        const cameraNX = new PerspectiveCamera( fov, aspect, near, far );
        cameraNX.layers = this.layers;
        cameraNX.up.set( 0, - 1, 0 );
        cameraNX.lookAt( new Vector3( - 1, 0, 0 ) );
        this.add( cameraNX );

        const cameraPY = new PerspectiveCamera( fov, aspect, near, far );
        cameraPY.layers = this.layers;
        cameraPY.up.set( 0, 0, 1 );
        cameraPY.lookAt( new Vector3( 0, 1, 0 ) );
        this.add( cameraPY );

        const cameraNY = new PerspectiveCamera( fov, aspect, near, far );
        cameraNY.layers = this.layers;
        cameraNY.up.set( 0, 0, - 1 );
        cameraNY.lookAt( new Vector3( 0, - 1, 0 ) );
        this.add( cameraNY );

        const cameraPZ = new PerspectiveCamera( fov, aspect, near, far );
        cameraPZ.layers = this.layers;
        cameraPZ.up.set( 0, - 1, 0 );
        cameraPZ.lookAt( new Vector3( 0, 0, 1 ) );
        this.add( cameraPZ );

        const cameraNZ = new PerspectiveCamera( fov, aspect, near, far );
        cameraNZ.layers = this.layers;
        cameraNZ.up.set( 0, - 1, 0 );
        cameraNZ.lookAt( new Vector3( 0, 0, - 1 ) );
        this.add( cameraNZ );

        this.update = function ( renderer, scene ) {

                if ( this.parent === null ) this.updateMatrixWorld();

                const currentXrEnabled = renderer.xr.enabled;
                const currentRenderTarget = renderer.getRenderTarget();

                renderer.xr.enabled = false;

                const generateMipmaps = renderTarget.texture.generateMipmaps;

                renderTarget.texture.generateMipmaps = false;

                renderer.setRenderTarget( renderTarget, 0 );
                renderer.render( scene, cameraPX );

                renderer.setRenderTarget( renderTarget, 1 );
                renderer.render( scene, cameraNX );

                renderer.setRenderTarget( renderTarget, 2 );
                renderer.render( scene, cameraPY );

                renderer.setRenderTarget( renderTarget, 3 );
                renderer.render( scene, cameraNY );

                renderer.setRenderTarget( renderTarget, 4 );
                renderer.render( scene, cameraPZ );

                renderTarget.texture.generateMipmaps = generateMipmaps;

                renderer.setRenderTarget( renderTarget, 5 );
                renderer.render( scene, cameraNZ );

                renderer.setRenderTarget( currentRenderTarget );

                renderer.xr.enabled = currentXrEnabled;

        };

}

CubeCamera.prototype = Object.create( Object3D.prototype );
CubeCamera.prototype.constructor = CubeCamera;

function CubeTexture( images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding ) {

        images = images !== undefined ? images : [];
        mapping = mapping !== undefined ? mapping : CubeReflectionMapping;
        format = format !== undefined ? format : RGBFormat;

        Texture.call( this, images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding );

        this.flipY = false;

        // Why CubeTexture._needsFlipEnvMap is necessary:
        //
        // By convention -- likely based on the RenderMan spec from the 1990's -- cube maps are specified by WebGL (and three.js)
        // in a coordinate system in which positive-x is to the right when looking up the positive-z axis -- in other words,
        // in a left-handed coordinate system. By continuing this convention, preexisting cube maps continued to render correctly.

        // three.js uses a right-handed coordinate system. So environment maps used in three.js appear to have px and nx swapped
        // and the flag _needsFlipEnvMap controls this conversion. The flip is not required (and thus _needsFlipEnvMap is set to false)
        // when using WebGLCubeRenderTarget.texture as a cube texture.

        this._needsFlipEnvMap = true;

}

CubeTexture.prototype = Object.create( Texture.prototype );
CubeTexture.prototype.constructor = CubeTexture;

CubeTexture.prototype.isCubeTexture = true;

Object.defineProperty( CubeTexture.prototype, 'images', {

        get: function () {

                return this.image;

        },

        set: function ( value ) {

                this.image = value;

        }

} );

function WebGLCubeRenderTarget( size, options, dummy ) {

        if ( Number.isInteger( options ) ) {

                console.warn( 'THREE.WebGLCubeRenderTarget: constructor signature is now WebGLCubeRenderTarget( size, options )' );

                options = dummy;

        }

        WebGLRenderTarget.call( this, size, size, options );

        options = options || {};

        this.texture = new CubeTexture( undefined, options.mapping, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.encoding );

        this.texture._needsFlipEnvMap = false;

}

WebGLCubeRenderTarget.prototype = Object.create( WebGLRenderTarget.prototype );
WebGLCubeRenderTarget.prototype.constructor = WebGLCubeRenderTarget;

WebGLCubeRenderTarget.prototype.isWebGLCubeRenderTarget = true;

WebGLCubeRenderTarget.prototype.fromEquirectangularTexture = function ( renderer, texture ) {

        this.texture.type = texture.type;
        this.texture.format = RGBAFormat; // see #18859
        this.texture.encoding = texture.encoding;

        this.texture.generateMipmaps = texture.generateMipmaps;
        this.texture.minFilter = texture.minFilter;
        this.texture.magFilter = texture.magFilter;

        const shader = {

                uniforms: {
                        tEquirect: { value: null },
                },

                vertexShader: /* glsl */`

                        varying vec3 vWorldDirection;

                        vec3 transformDirection( in vec3 dir, in mat4 matrix ) {

                                return normalize( ( matrix * vec4( dir, 0.0 ) ).xyz );

                        }

                        void main() {

                                vWorldDirection = transformDirection( position, modelMatrix );

                                #include <begin_vertex>
                                #include <project_vertex>

                        }
                `,

                fragmentShader: /* glsl */`

                        uniform sampler2D tEquirect;

                        varying vec3 vWorldDirection;

                        #include <common>

                        void main() {

                                vec3 direction = normalize( vWorldDirection );

                                vec2 sampleUV = equirectUv( direction );

                                gl_FragColor = texture2D( tEquirect, sampleUV );

                        }
                `
        };

        const geometry = new BoxBufferGeometry( 5, 5, 5 );

        const material = new ShaderMaterial( {

                name: 'CubemapFromEquirect',

                uniforms: cloneUniforms( shader.uniforms ),
                vertexShader: shader.vertexShader,
                fragmentShader: shader.fragmentShader,
                side: BackSide,
                blending: NoBlending

        } );

        material.uniforms.tEquirect.value = texture;

        const mesh = new Mesh( geometry, material );

        const currentMinFilter = texture.minFilter;

        // Avoid blurred poles
        if ( texture.minFilter === LinearMipmapLinearFilter ) texture.minFilter = LinearFilter;

        const camera = new CubeCamera( 1, 10, this );
        camera.update( renderer, mesh );

        texture.minFilter = currentMinFilter;

        mesh.geometry.dispose();
        mesh.material.dispose();

        return this;

};

WebGLCubeRenderTarget.prototype.clear = function ( renderer, color, depth, stencil ) {

        const currentRenderTarget = renderer.getRenderTarget();

        for ( let i = 0; i < 6; i ++ ) {

                renderer.setRenderTarget( this, i );

                renderer.clear( color, depth, stencil );

        }

        renderer.setRenderTarget( currentRenderTarget );

};

function DataTexture( data, width, height, format, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, encoding ) {

        Texture.call( this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding );

        this.image = { data: data || null, width: width || 1, height: height || 1 };

        this.magFilter = magFilter !== undefined ? magFilter : NearestFilter;
        this.minFilter = minFilter !== undefined ? minFilter : NearestFilter;

        this.generateMipmaps = false;
        this.flipY = false;
        this.unpackAlignment = 1;

        this.needsUpdate = true;

}

DataTexture.prototype = Object.create( Texture.prototype );
DataTexture.prototype.constructor = DataTexture;

DataTexture.prototype.isDataTexture = true;

const _sphere$1 = /*@__PURE__*/ new Sphere();
const _vector$5 = /*@__PURE__*/ new Vector3();

class Frustum {

        constructor( p0, p1, p2, p3, p4, p5 ) {

                this.planes = [

                        ( p0 !== undefined ) ? p0 : new Plane(),
                        ( p1 !== undefined ) ? p1 : new Plane(),
                        ( p2 !== undefined ) ? p2 : new Plane(),
                        ( p3 !== undefined ) ? p3 : new Plane(),
                        ( p4 !== undefined ) ? p4 : new Plane(),
                        ( p5 !== undefined ) ? p5 : new Plane()

                ];

        }

        set( p0, p1, p2, p3, p4, p5 ) {

                const planes = this.planes;

                planes[ 0 ].copy( p0 );
                planes[ 1 ].copy( p1 );
                planes[ 2 ].copy( p2 );
                planes[ 3 ].copy( p3 );
                planes[ 4 ].copy( p4 );
                planes[ 5 ].copy( p5 );

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( frustum ) {

                const planes = this.planes;

                for ( let i = 0; i < 6; i ++ ) {

                        planes[ i ].copy( frustum.planes[ i ] );

                }

                return this;

        }

        setFromProjectionMatrix( m ) {

                const planes = this.planes;
                const me = m.elements;
                const me0 = me[ 0 ], me1 = me[ 1 ], me2 = me[ 2 ], me3 = me[ 3 ];
                const me4 = me[ 4 ], me5 = me[ 5 ], me6 = me[ 6 ], me7 = me[ 7 ];
                const me8 = me[ 8 ], me9 = me[ 9 ], me10 = me[ 10 ], me11 = me[ 11 ];
                const me12 = me[ 12 ], me13 = me[ 13 ], me14 = me[ 14 ], me15 = me[ 15 ];

                planes[ 0 ].setComponents( me3 - me0, me7 - me4, me11 - me8, me15 - me12 ).normalize();
                planes[ 1 ].setComponents( me3 + me0, me7 + me4, me11 + me8, me15 + me12 ).normalize();
                planes[ 2 ].setComponents( me3 + me1, me7 + me5, me11 + me9, me15 + me13 ).normalize();
                planes[ 3 ].setComponents( me3 - me1, me7 - me5, me11 - me9, me15 - me13 ).normalize();
                planes[ 4 ].setComponents( me3 - me2, me7 - me6, me11 - me10, me15 - me14 ).normalize();
                planes[ 5 ].setComponents( me3 + me2, me7 + me6, me11 + me10, me15 + me14 ).normalize();

                return this;

        }

        intersectsObject( object ) {

                const geometry = object.geometry;

                if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

                _sphere$1.copy( geometry.boundingSphere ).applyMatrix4( object.matrixWorld );

                return this.intersectsSphere( _sphere$1 );

        }

        intersectsSprite( sprite ) {

                _sphere$1.center.set( 0, 0, 0 );
                _sphere$1.radius = 0.7071067811865476;
                _sphere$1.applyMatrix4( sprite.matrixWorld );

                return this.intersectsSphere( _sphere$1 );

        }

        intersectsSphere( sphere ) {

                const planes = this.planes;
                const center = sphere.center;
                const negRadius = - sphere.radius;

                for ( let i = 0; i < 6; i ++ ) {

                        const distance = planes[ i ].distanceToPoint( center );

                        if ( distance < negRadius ) {

                                return false;

                        }

                }

                return true;

        }

        intersectsBox( box ) {

                const planes = this.planes;

                for ( let i = 0; i < 6; i ++ ) {

                        const plane = planes[ i ];

                        // corner at max distance

                        _vector$5.x = plane.normal.x > 0 ? box.max.x : box.min.x;
                        _vector$5.y = plane.normal.y > 0 ? box.max.y : box.min.y;
                        _vector$5.z = plane.normal.z > 0 ? box.max.z : box.min.z;

                        if ( plane.distanceToPoint( _vector$5 ) < 0 ) {

                                return false;

                        }

                }

                return true;

        }

        containsPoint( point ) {

                const planes = this.planes;

                for ( let i = 0; i < 6; i ++ ) {

                        if ( planes[ i ].distanceToPoint( point ) < 0 ) {

                                return false;

                        }

                }

                return true;

        }

}

function WebGLAnimation() {

        let context = null;
        let isAnimating = false;
        let animationLoop = null;
        let requestId = null;

        function onAnimationFrame( time, frame ) {

                animationLoop( time, frame );

                requestId = context.requestAnimationFrame( onAnimationFrame );

        }

        return {

                start: function () {

                        if ( isAnimating === true ) return;
                        if ( animationLoop === null ) return;

                        requestId = context.requestAnimationFrame( onAnimationFrame );

                        isAnimating = true;

                },

                stop: function () {

                        context.cancelAnimationFrame( requestId );

                        isAnimating = false;

                },

                setAnimationLoop: function ( callback ) {

                        animationLoop = callback;

                },

                setContext: function ( value ) {

                        context = value;

                }

        };

}

function WebGLAttributes( gl, capabilities ) {

        const isWebGL2 = capabilities.isWebGL2;

        const buffers = new WeakMap();

        function createBuffer( attribute, bufferType ) {

                const array = attribute.array;
                const usage = attribute.usage;

                const buffer = gl.createBuffer();

                gl.bindBuffer( bufferType, buffer );
                gl.bufferData( bufferType, array, usage );

                attribute.onUploadCallback();

                let type = 5126;

                if ( array instanceof Float32Array ) {

                        type = 5126;

                } else if ( array instanceof Float64Array ) {

                        console.warn( 'THREE.WebGLAttributes: Unsupported data buffer format: Float64Array.' );

                } else if ( array instanceof Uint16Array ) {

                        if ( attribute.isFloat16BufferAttribute ) {

                                if ( isWebGL2 ) {

                                        type = 5131;

                                } else {

                                        console.warn( 'THREE.WebGLAttributes: Usage of Float16BufferAttribute requires WebGL2.' );

                                }

                        } else {

                                type = 5123;

                        }

                } else if ( array instanceof Int16Array ) {

                        type = 5122;

                } else if ( array instanceof Uint32Array ) {

                        type = 5125;

                } else if ( array instanceof Int32Array ) {

                        type = 5124;

                } else if ( array instanceof Int8Array ) {

                        type = 5120;

                } else if ( array instanceof Uint8Array ) {

                        type = 5121;

                }

                return {
                        buffer: buffer,
                        type: type,
                        bytesPerElement: array.BYTES_PER_ELEMENT,
                        version: attribute.version
                };

        }

        function updateBuffer( buffer, attribute, bufferType ) {

                const array = attribute.array;
                const updateRange = attribute.updateRange;

                gl.bindBuffer( bufferType, buffer );

                if ( updateRange.count === - 1 ) {

                        // Not using update ranges

                        gl.bufferSubData( bufferType, 0, array );

                } else {

                        if ( isWebGL2 ) {

                                gl.bufferSubData( bufferType, updateRange.offset * array.BYTES_PER_ELEMENT,
                                        array, updateRange.offset, updateRange.count );

                        } else {

                                gl.bufferSubData( bufferType, updateRange.offset * array.BYTES_PER_ELEMENT,
                                        array.subarray( updateRange.offset, updateRange.offset + updateRange.count ) );

                        }

                        updateRange.count = - 1; // reset range

                }

        }

        //

        function get( attribute ) {

                if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;

                return buffers.get( attribute );

        }

        function remove( attribute ) {

                if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;

                const data = buffers.get( attribute );

                if ( data ) {

                        gl.deleteBuffer( data.buffer );

                        buffers.delete( attribute );

                }

        }

        function update( attribute, bufferType ) {

                if ( attribute.isGLBufferAttribute ) {

                        const cached = buffers.get( attribute );

                        if ( ! cached || cached.version < attribute.version ) {

                                buffers.set( attribute, {
                                        buffer: attribute.buffer,
                                        type: attribute.type,
                                        bytesPerElement: attribute.elementSize,
                                        version: attribute.version
                                } );

                        }

                        return;

                }

                if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;

                const data = buffers.get( attribute );

                if ( data === undefined ) {

                        buffers.set( attribute, createBuffer( attribute, bufferType ) );

                } else if ( data.version < attribute.version ) {

                        updateBuffer( data.buffer, attribute, bufferType );

                        data.version = attribute.version;

                }

        }

        return {

                get: get,
                remove: remove,
                update: update

        };

}

class PlaneBufferGeometry extends BufferGeometry {

        constructor( width = 1, height = 1, widthSegments = 1, heightSegments = 1 ) {

                super();
                this.type = 'PlaneBufferGeometry';

                this.parameters = {
                        width: width,
                        height: height,
                        widthSegments: widthSegments,
                        heightSegments: heightSegments
                };

                const width_half = width / 2;
                const height_half = height / 2;

                const gridX = Math.floor( widthSegments );
                const gridY = Math.floor( heightSegments );

                const gridX1 = gridX + 1;
                const gridY1 = gridY + 1;

                const segment_width = width / gridX;
                const segment_height = height / gridY;

                //

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                for ( let iy = 0; iy < gridY1; iy ++ ) {

                        const y = iy * segment_height - height_half;

                        for ( let ix = 0; ix < gridX1; ix ++ ) {

                                const x = ix * segment_width - width_half;

                                vertices.push( x, - y, 0 );

                                normals.push( 0, 0, 1 );

                                uvs.push( ix / gridX );
                                uvs.push( 1 - ( iy / gridY ) );

                        }

                }

                for ( let iy = 0; iy < gridY; iy ++ ) {

                        for ( let ix = 0; ix < gridX; ix ++ ) {

                                const a = ix + gridX1 * iy;
                                const b = ix + gridX1 * ( iy + 1 );
                                const c = ( ix + 1 ) + gridX1 * ( iy + 1 );
                                const d = ( ix + 1 ) + gridX1 * iy;

                                indices.push( a, b, d );
                                indices.push( b, c, d );

                        }

                }

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

        }

}

var alphamap_fragment = "#ifdef USE_ALPHAMAP\n\tdiffuseColor.a *= texture2D( alphaMap, vUv ).g;\n#endif";

var alphamap_pars_fragment = "#ifdef USE_ALPHAMAP\n\tuniform sampler2D alphaMap;\n#endif";

var alphatest_fragment = "#ifdef ALPHATEST\n\tif ( diffuseColor.a < ALPHATEST ) discard;\n#endif";

var aomap_fragment = "#ifdef USE_AOMAP\n\tfloat ambientOcclusion = ( texture2D( aoMap, vUv2 ).r - 1.0 ) * aoMapIntensity + 1.0;\n\treflectedLight.indirectDiffuse *= ambientOcclusion;\n\t#if defined( USE_ENVMAP ) && defined( STANDARD )\n\t\tfloat dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );\n\t\treflectedLight.indirectSpecular *= computeSpecularOcclusion( dotNV, ambientOcclusion, material.specularRoughness );\n\t#endif\n#endif";

var aomap_pars_fragment = "#ifdef USE_AOMAP\n\tuniform sampler2D aoMap;\n\tuniform float aoMapIntensity;\n#endif";

var begin_vertex = "vec3 transformed = vec3( position );";

var beginnormal_vertex = "vec3 objectNormal = vec3( normal );\n#ifdef USE_TANGENT\n\tvec3 objectTangent = vec3( tangent.xyz );\n#endif";

var bsdfs = "vec2 integrateSpecularBRDF( const in float dotNV, const in float roughness ) {\n\tconst vec4 c0 = vec4( - 1, - 0.0275, - 0.572, 0.022 );\n\tconst vec4 c1 = vec4( 1, 0.0425, 1.04, - 0.04 );\n\tvec4 r = roughness * c0 + c1;\n\tfloat a004 = min( r.x * r.x, exp2( - 9.28 * dotNV ) ) * r.x + r.y;\n\treturn vec2( -1.04, 1.04 ) * a004 + r.zw;\n}\nfloat punctualLightIntensityToIrradianceFactor( const in float lightDistance, const in float cutoffDistance, const in float decayExponent ) {\n#if defined ( PHYSICALLY_CORRECT_LIGHTS )\n\tfloat distanceFalloff = 1.0 / max( pow( lightDistance, decayExponent ), 0.01 );\n\tif( cutoffDistance > 0.0 ) {\n\t\tdistanceFalloff *= pow2( saturate( 1.0 - pow4( lightDistance / cutoffDistance ) ) );\n\t}\n\treturn distanceFalloff;\n#else\n\tif( cutoffDistance > 0.0 && decayExponent > 0.0 ) {\n\t\treturn pow( saturate( -lightDistance / cutoffDistance + 1.0 ), decayExponent );\n\t}\n\treturn 1.0;\n#endif\n}\nvec3 BRDF_Diffuse_Lambert( const in vec3 diffuseColor ) {\n\treturn RECIPROCAL_PI * diffuseColor;\n}\nvec3 F_Schlick( const in vec3 specularColor, const in float dotLH ) {\n\tfloat fresnel = exp2( ( -5.55473 * dotLH - 6.98316 ) * dotLH );\n\treturn ( 1.0 - specularColor ) * fresnel + specularColor;\n}\nvec3 F_Schlick_RoughnessDependent( const in vec3 F0, const in float dotNV, const in float roughness ) {\n\tfloat fresnel = exp2( ( -5.55473 * dotNV - 6.98316 ) * dotNV );\n\tvec3 Fr = max( vec3( 1.0 - roughness ), F0 ) - F0;\n\treturn Fr * fresnel + F0;\n}\nfloat G_GGX_Smith( const in float alpha, const in float dotNL, const in float dotNV ) {\n\tfloat a2 = pow2( alpha );\n\tfloat gl = dotNL + sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );\n\tfloat gv = dotNV + sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );\n\treturn 1.0 / ( gl * gv );\n}\nfloat G_GGX_SmithCorrelated( const in float alpha, const in float dotNL, const in float dotNV ) {\n\tfloat a2 = pow2( alpha );\n\tfloat gv = dotNL * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );\n\tfloat gl = dotNV * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );\n\treturn 0.5 / max( gv + gl, EPSILON );\n}\nfloat D_GGX( const in float alpha, const in float dotNH ) {\n\tfloat a2 = pow2( alpha );\n\tfloat denom = pow2( dotNH ) * ( a2 - 1.0 ) + 1.0;\n\treturn RECIPROCAL_PI * a2 / pow2( denom );\n}\nvec3 BRDF_Specular_GGX( const in IncidentLight incidentLight, const in vec3 viewDir, const in vec3 normal, const in vec3 specularColor, const in float roughness ) {\n\tfloat alpha = pow2( roughness );\n\tvec3 halfDir = normalize( incidentLight.direction + viewDir );\n\tfloat dotNL = saturate( dot( normal, incidentLight.direction ) );\n\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\tfloat dotNH = saturate( dot( normal, halfDir ) );\n\tfloat dotLH = saturate( dot( incidentLight.direction, halfDir ) );\n\tvec3 F = F_Schlick( specularColor, dotLH );\n\tfloat G = G_GGX_SmithCorrelated( alpha, dotNL, dotNV );\n\tfloat D = D_GGX( alpha, dotNH );\n\treturn F * ( G * D );\n}\nvec2 LTC_Uv( const in vec3 N, const in vec3 V, const in float roughness ) {\n\tconst float LUT_SIZE = 64.0;\n\tconst float LUT_SCALE = ( LUT_SIZE - 1.0 ) / LUT_SIZE;\n\tconst float LUT_BIAS = 0.5 / LUT_SIZE;\n\tfloat dotNV = saturate( dot( N, V ) );\n\tvec2 uv = vec2( roughness, sqrt( 1.0 - dotNV ) );\n\tuv = uv * LUT_SCALE + LUT_BIAS;\n\treturn uv;\n}\nfloat LTC_ClippedSphereFormFactor( const in vec3 f ) {\n\tfloat l = length( f );\n\treturn max( ( l * l + f.z ) / ( l + 1.0 ), 0.0 );\n}\nvec3 LTC_EdgeVectorFormFactor( const in vec3 v1, const in vec3 v2 ) {\n\tfloat x = dot( v1, v2 );\n\tfloat y = abs( x );\n\tfloat a = 0.8543985 + ( 0.4965155 + 0.0145206 * y ) * y;\n\tfloat b = 3.4175940 + ( 4.1616724 + y ) * y;\n\tfloat v = a / b;\n\tfloat theta_sintheta = ( x > 0.0 ) ? v : 0.5 * inversesqrt( max( 1.0 - x * x, 1e-7 ) ) - v;\n\treturn cross( v1, v2 ) * theta_sintheta;\n}\nvec3 LTC_Evaluate( const in vec3 N, const in vec3 V, const in vec3 P, const in mat3 mInv, const in vec3 rectCoords[ 4 ] ) {\n\tvec3 v1 = rectCoords[ 1 ] - rectCoords[ 0 ];\n\tvec3 v2 = rectCoords[ 3 ] - rectCoords[ 0 ];\n\tvec3 lightNormal = cross( v1, v2 );\n\tif( dot( lightNormal, P - rectCoords[ 0 ] ) < 0.0 ) return vec3( 0.0 );\n\tvec3 T1, T2;\n\tT1 = normalize( V - N * dot( V, N ) );\n\tT2 = - cross( N, T1 );\n\tmat3 mat = mInv * transposeMat3( mat3( T1, T2, N ) );\n\tvec3 coords[ 4 ];\n\tcoords[ 0 ] = mat * ( rectCoords[ 0 ] - P );\n\tcoords[ 1 ] = mat * ( rectCoords[ 1 ] - P );\n\tcoords[ 2 ] = mat * ( rectCoords[ 2 ] - P );\n\tcoords[ 3 ] = mat * ( rectCoords[ 3 ] - P );\n\tcoords[ 0 ] = normalize( coords[ 0 ] );\n\tcoords[ 1 ] = normalize( coords[ 1 ] );\n\tcoords[ 2 ] = normalize( coords[ 2 ] );\n\tcoords[ 3 ] = normalize( coords[ 3 ] );\n\tvec3 vectorFormFactor = vec3( 0.0 );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 0 ], coords[ 1 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 1 ], coords[ 2 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 2 ], coords[ 3 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 3 ], coords[ 0 ] );\n\tfloat result = LTC_ClippedSphereFormFactor( vectorFormFactor );\n\treturn vec3( result );\n}\nvec3 BRDF_Specular_GGX_Environment( const in vec3 viewDir, const in vec3 normal, const in vec3 specularColor, const in float roughness ) {\n\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\tvec2 brdf = integrateSpecularBRDF( dotNV, roughness );\n\treturn specularColor * brdf.x + brdf.y;\n}\nvoid BRDF_Specular_Multiscattering_Environment( const in GeometricContext geometry, const in vec3 specularColor, const in float roughness, inout vec3 singleScatter, inout vec3 multiScatter ) {\n\tfloat dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );\n\tvec3 F = F_Schlick_RoughnessDependent( specularColor, dotNV, roughness );\n\tvec2 brdf = integrateSpecularBRDF( dotNV, roughness );\n\tvec3 FssEss = F * brdf.x + brdf.y;\n\tfloat Ess = brdf.x + brdf.y;\n\tfloat Ems = 1.0 - Ess;\n\tvec3 Favg = specularColor + ( 1.0 - specularColor ) * 0.047619;\tvec3 Fms = FssEss * Favg / ( 1.0 - Ems * Favg );\n\tsingleScatter += FssEss;\n\tmultiScatter += Fms * Ems;\n}\nfloat G_BlinnPhong_Implicit( ) {\n\treturn 0.25;\n}\nfloat D_BlinnPhong( const in float shininess, const in float dotNH ) {\n\treturn RECIPROCAL_PI * ( shininess * 0.5 + 1.0 ) * pow( dotNH, shininess );\n}\nvec3 BRDF_Specular_BlinnPhong( const in IncidentLight incidentLight, const in GeometricContext geometry, const in vec3 specularColor, const in float shininess ) {\n\tvec3 halfDir = normalize( incidentLight.direction + geometry.viewDir );\n\tfloat dotNH = saturate( dot( geometry.normal, halfDir ) );\n\tfloat dotLH = saturate( dot( incidentLight.direction, halfDir ) );\n\tvec3 F = F_Schlick( specularColor, dotLH );\n\tfloat G = G_BlinnPhong_Implicit( );\n\tfloat D = D_BlinnPhong( shininess, dotNH );\n\treturn F * ( G * D );\n}\nfloat GGXRoughnessToBlinnExponent( const in float ggxRoughness ) {\n\treturn ( 2.0 / pow2( ggxRoughness + 0.0001 ) - 2.0 );\n}\nfloat BlinnExponentToGGXRoughness( const in float blinnExponent ) {\n\treturn sqrt( 2.0 / ( blinnExponent + 2.0 ) );\n}\n#if defined( USE_SHEEN )\nfloat D_Charlie(float roughness, float NoH) {\n\tfloat invAlpha = 1.0 / roughness;\n\tfloat cos2h = NoH * NoH;\n\tfloat sin2h = max(1.0 - cos2h, 0.0078125);\treturn (2.0 + invAlpha) * pow(sin2h, invAlpha * 0.5) / (2.0 * PI);\n}\nfloat V_Neubelt(float NoV, float NoL) {\n\treturn saturate(1.0 / (4.0 * (NoL + NoV - NoL * NoV)));\n}\nvec3 BRDF_Specular_Sheen( const in float roughness, const in vec3 L, const in GeometricContext geometry, vec3 specularColor ) {\n\tvec3 N = geometry.normal;\n\tvec3 V = geometry.viewDir;\n\tvec3 H = normalize( V + L );\n\tfloat dotNH = saturate( dot( N, H ) );\n\treturn specularColor * D_Charlie( roughness, dotNH ) * V_Neubelt( dot(N, V), dot(N, L) );\n}\n#endif";

var bumpmap_pars_fragment = "#ifdef USE_BUMPMAP\n\tuniform sampler2D bumpMap;\n\tuniform float bumpScale;\n\tvec2 dHdxy_fwd() {\n\t\tvec2 dSTdx = dFdx( vUv );\n\t\tvec2 dSTdy = dFdy( vUv );\n\t\tfloat Hll = bumpScale * texture2D( bumpMap, vUv ).x;\n\t\tfloat dBx = bumpScale * texture2D( bumpMap, vUv + dSTdx ).x - Hll;\n\t\tfloat dBy = bumpScale * texture2D( bumpMap, vUv + dSTdy ).x - Hll;\n\t\treturn vec2( dBx, dBy );\n\t}\n\tvec3 perturbNormalArb( vec3 surf_pos, vec3 surf_norm, vec2 dHdxy ) {\n\t\tvec3 vSigmaX = vec3( dFdx( surf_pos.x ), dFdx( surf_pos.y ), dFdx( surf_pos.z ) );\n\t\tvec3 vSigmaY = vec3( dFdy( surf_pos.x ), dFdy( surf_pos.y ), dFdy( surf_pos.z ) );\n\t\tvec3 vN = surf_norm;\n\t\tvec3 R1 = cross( vSigmaY, vN );\n\t\tvec3 R2 = cross( vN, vSigmaX );\n\t\tfloat fDet = dot( vSigmaX, R1 );\n\t\tfDet *= ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\tvec3 vGrad = sign( fDet ) * ( dHdxy.x * R1 + dHdxy.y * R2 );\n\t\treturn normalize( abs( fDet ) * surf_norm - vGrad );\n\t}\n#endif";

var clipping_planes_fragment = "#if NUM_CLIPPING_PLANES > 0\n\tvec4 plane;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < UNION_CLIPPING_PLANES; i ++ ) {\n\t\tplane = clippingPlanes[ i ];\n\t\tif ( dot( vClipPosition, plane.xyz ) > plane.w ) discard;\n\t}\n\t#pragma unroll_loop_end\n\t#if UNION_CLIPPING_PLANES < NUM_CLIPPING_PLANES\n\t\tbool clipped = true;\n\t\t#pragma unroll_loop_start\n\t\tfor ( int i = UNION_CLIPPING_PLANES; i < NUM_CLIPPING_PLANES; i ++ ) {\n\t\t\tplane = clippingPlanes[ i ];\n\t\t\tclipped = ( dot( vClipPosition, plane.xyz ) > plane.w ) && clipped;\n\t\t}\n\t\t#pragma unroll_loop_end\n\t\tif ( clipped ) discard;\n\t#endif\n#endif";

var clipping_planes_pars_fragment = "#if NUM_CLIPPING_PLANES > 0\n\tvarying vec3 vClipPosition;\n\tuniform vec4 clippingPlanes[ NUM_CLIPPING_PLANES ];\n#endif";

var clipping_planes_pars_vertex = "#if NUM_CLIPPING_PLANES > 0\n\tvarying vec3 vClipPosition;\n#endif";

var clipping_planes_vertex = "#if NUM_CLIPPING_PLANES > 0\n\tvClipPosition = - mvPosition.xyz;\n#endif";

var color_fragment = "#ifdef USE_COLOR\n\tdiffuseColor.rgb *= vColor;\n#endif";

var color_pars_fragment = "#ifdef USE_COLOR\n\tvarying vec3 vColor;\n#endif";

var color_pars_vertex = "#if defined( USE_COLOR ) || defined( USE_INSTANCING_COLOR )\n\tvarying vec3 vColor;\n#endif";

var color_vertex = "#if defined( USE_COLOR ) || defined( USE_INSTANCING_COLOR )\n\tvColor = vec3( 1.0 );\n#endif\n#ifdef USE_COLOR\n\tvColor.xyz *= color.xyz;\n#endif\n#ifdef USE_INSTANCING_COLOR\n\tvColor.xyz *= instanceColor.xyz;\n#endif";

var common = "#define PI 3.141592653589793\n#define PI2 6.283185307179586\n#define PI_HALF 1.5707963267948966\n#define RECIPROCAL_PI 0.3183098861837907\n#define RECIPROCAL_PI2 0.15915494309189535\n#define EPSILON 1e-6\n#ifndef saturate\n#define saturate(a) clamp( a, 0.0, 1.0 )\n#endif\n#define whiteComplement(a) ( 1.0 - saturate( a ) )\nfloat pow2( const in float x ) { return x*x; }\nfloat pow3( const in float x ) { return x*x*x; }\nfloat pow4( const in float x ) { float x2 = x*x; return x2*x2; }\nfloat average( const in vec3 color ) { return dot( color, vec3( 0.3333 ) ); }\nhighp float rand( const in vec2 uv ) {\n\tconst highp float a = 12.9898, b = 78.233, c = 43758.5453;\n\thighp float dt = dot( uv.xy, vec2( a,b ) ), sn = mod( dt, PI );\n\treturn fract(sin(sn) * c);\n}\n#ifdef HIGH_PRECISION\n\tfloat precisionSafeLength( vec3 v ) { return length( v ); }\n#else\n\tfloat max3( vec3 v ) { return max( max( v.x, v.y ), v.z ); }\n\tfloat precisionSafeLength( vec3 v ) {\n\t\tfloat maxComponent = max3( abs( v ) );\n\t\treturn length( v / maxComponent ) * maxComponent;\n\t}\n#endif\nstruct IncidentLight {\n\tvec3 color;\n\tvec3 direction;\n\tbool visible;\n};\nstruct ReflectedLight {\n\tvec3 directDiffuse;\n\tvec3 directSpecular;\n\tvec3 indirectDiffuse;\n\tvec3 indirectSpecular;\n};\nstruct GeometricContext {\n\tvec3 position;\n\tvec3 normal;\n\tvec3 viewDir;\n#ifdef CLEARCOAT\n\tvec3 clearcoatNormal;\n#endif\n};\nvec3 transformDirection( in vec3 dir, in mat4 matrix ) {\n\treturn normalize( ( matrix * vec4( dir, 0.0 ) ).xyz );\n}\nvec3 inverseTransformDirection( in vec3 dir, in mat4 matrix ) {\n\treturn normalize( ( vec4( dir, 0.0 ) * matrix ).xyz );\n}\nvec3 projectOnPlane(in vec3 point, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\tfloat distance = dot( planeNormal, point - pointOnPlane );\n\treturn - distance * planeNormal + point;\n}\nfloat sideOfPlane( in vec3 point, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\treturn sign( dot( point - pointOnPlane, planeNormal ) );\n}\nvec3 linePlaneIntersect( in vec3 pointOnLine, in vec3 lineDirection, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\treturn lineDirection * ( dot( planeNormal, pointOnPlane - pointOnLine ) / dot( planeNormal, lineDirection ) ) + pointOnLine;\n}\nmat3 transposeMat3( const in mat3 m ) {\n\tmat3 tmp;\n\ttmp[ 0 ] = vec3( m[ 0 ].x, m[ 1 ].x, m[ 2 ].x );\n\ttmp[ 1 ] = vec3( m[ 0 ].y, m[ 1 ].y, m[ 2 ].y );\n\ttmp[ 2 ] = vec3( m[ 0 ].z, m[ 1 ].z, m[ 2 ].z );\n\treturn tmp;\n}\nfloat linearToRelativeLuminance( const in vec3 color ) {\n\tvec3 weights = vec3( 0.2126, 0.7152, 0.0722 );\n\treturn dot( weights, color.rgb );\n}\nbool isPerspectiveMatrix( mat4 m ) {\n\treturn m[ 2 ][ 3 ] == - 1.0;\n}\nvec2 equirectUv( in vec3 dir ) {\n\tfloat u = atan( dir.z, dir.x ) * RECIPROCAL_PI2 + 0.5;\n\tfloat v = asin( clamp( dir.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;\n\treturn vec2( u, v );\n}";

var cube_uv_reflection_fragment = "#ifdef ENVMAP_TYPE_CUBE_UV\n\t#define cubeUV_maxMipLevel 8.0\n\t#define cubeUV_minMipLevel 4.0\n\t#define cubeUV_maxTileSize 256.0\n\t#define cubeUV_minTileSize 16.0\n\tfloat getFace( vec3 direction ) {\n\t\tvec3 absDirection = abs( direction );\n\t\tfloat face = - 1.0;\n\t\tif ( absDirection.x > absDirection.z ) {\n\t\t\tif ( absDirection.x > absDirection.y )\n\t\t\t\tface = direction.x > 0.0 ? 0.0 : 3.0;\n\t\t\telse\n\t\t\t\tface = direction.y > 0.0 ? 1.0 : 4.0;\n\t\t} else {\n\t\t\tif ( absDirection.z > absDirection.y )\n\t\t\t\tface = direction.z > 0.0 ? 2.0 : 5.0;\n\t\t\telse\n\t\t\t\tface = direction.y > 0.0 ? 1.0 : 4.0;\n\t\t}\n\t\treturn face;\n\t}\n\tvec2 getUV( vec3 direction, float face ) {\n\t\tvec2 uv;\n\t\tif ( face == 0.0 ) {\n\t\t\tuv = vec2( direction.z, direction.y ) / abs( direction.x );\n\t\t} else if ( face == 1.0 ) {\n\t\t\tuv = vec2( - direction.x, - direction.z ) / abs( direction.y );\n\t\t} else if ( face == 2.0 ) {\n\t\t\tuv = vec2( - direction.x, direction.y ) / abs( direction.z );\n\t\t} else if ( face == 3.0 ) {\n\t\t\tuv = vec2( - direction.z, direction.y ) / abs( direction.x );\n\t\t} else if ( face == 4.0 ) {\n\t\t\tuv = vec2( - direction.x, direction.z ) / abs( direction.y );\n\t\t} else {\n\t\t\tuv = vec2( direction.x, direction.y ) / abs( direction.z );\n\t\t}\n\t\treturn 0.5 * ( uv + 1.0 );\n\t}\n\tvec3 bilinearCubeUV( sampler2D envMap, vec3 direction, float mipInt ) {\n\t\tfloat face = getFace( direction );\n\t\tfloat filterInt = max( cubeUV_minMipLevel - mipInt, 0.0 );\n\t\tmipInt = max( mipInt, cubeUV_minMipLevel );\n\t\tfloat faceSize = exp2( mipInt );\n\t\tfloat texelSize = 1.0 / ( 3.0 * cubeUV_maxTileSize );\n\t\tvec2 uv = getUV( direction, face ) * ( faceSize - 1.0 );\n\t\tvec2 f = fract( uv );\n\t\tuv += 0.5 - f;\n\t\tif ( face > 2.0 ) {\n\t\t\tuv.y += faceSize;\n\t\t\tface -= 3.0;\n\t\t}\n\t\tuv.x += face * faceSize;\n\t\tif ( mipInt < cubeUV_maxMipLevel ) {\n\t\t\tuv.y += 2.0 * cubeUV_maxTileSize;\n\t\t}\n\t\tuv.y += filterInt * 2.0 * cubeUV_minTileSize;\n\t\tuv.x += 3.0 * max( 0.0, cubeUV_maxTileSize - 2.0 * faceSize );\n\t\tuv *= texelSize;\n\t\tvec3 tl = envMapTexelToLinear( texture2D( envMap, uv ) ).rgb;\n\t\tuv.x += texelSize;\n\t\tvec3 tr = envMapTexelToLinear( texture2D( envMap, uv ) ).rgb;\n\t\tuv.y += texelSize;\n\t\tvec3 br = envMapTexelToLinear( texture2D( envMap, uv ) ).rgb;\n\t\tuv.x -= texelSize;\n\t\tvec3 bl = envMapTexelToLinear( texture2D( envMap, uv ) ).rgb;\n\t\tvec3 tm = mix( tl, tr, f.x );\n\t\tvec3 bm = mix( bl, br, f.x );\n\t\treturn mix( tm, bm, f.y );\n\t}\n\t#define r0 1.0\n\t#define v0 0.339\n\t#define m0 - 2.0\n\t#define r1 0.8\n\t#define v1 0.276\n\t#define m1 - 1.0\n\t#define r4 0.4\n\t#define v4 0.046\n\t#define m4 2.0\n\t#define r5 0.305\n\t#define v5 0.016\n\t#define m5 3.0\n\t#define r6 0.21\n\t#define v6 0.0038\n\t#define m6 4.0\n\tfloat roughnessToMip( float roughness ) {\n\t\tfloat mip = 0.0;\n\t\tif ( roughness >= r1 ) {\n\t\t\tmip = ( r0 - roughness ) * ( m1 - m0 ) / ( r0 - r1 ) + m0;\n\t\t} else if ( roughness >= r4 ) {\n\t\t\tmip = ( r1 - roughness ) * ( m4 - m1 ) / ( r1 - r4 ) + m1;\n\t\t} else if ( roughness >= r5 ) {\n\t\t\tmip = ( r4 - roughness ) * ( m5 - m4 ) / ( r4 - r5 ) + m4;\n\t\t} else if ( roughness >= r6 ) {\n\t\t\tmip = ( r5 - roughness ) * ( m6 - m5 ) / ( r5 - r6 ) + m5;\n\t\t} else {\n\t\t\tmip = - 2.0 * log2( 1.16 * roughness );\t\t}\n\t\treturn mip;\n\t}\n\tvec4 textureCubeUV( sampler2D envMap, vec3 sampleDir, float roughness ) {\n\t\tfloat mip = clamp( roughnessToMip( roughness ), m0, cubeUV_maxMipLevel );\n\t\tfloat mipF = fract( mip );\n\t\tfloat mipInt = floor( mip );\n\t\tvec3 color0 = bilinearCubeUV( envMap, sampleDir, mipInt );\n\t\tif ( mipF == 0.0 ) {\n\t\t\treturn vec4( color0, 1.0 );\n\t\t} else {\n\t\t\tvec3 color1 = bilinearCubeUV( envMap, sampleDir, mipInt + 1.0 );\n\t\t\treturn vec4( mix( color0, color1, mipF ), 1.0 );\n\t\t}\n\t}\n#endif";

var defaultnormal_vertex = "vec3 transformedNormal = objectNormal;\n#ifdef USE_INSTANCING\n\tmat3 m = mat3( instanceMatrix );\n\ttransformedNormal /= vec3( dot( m[ 0 ], m[ 0 ] ), dot( m[ 1 ], m[ 1 ] ), dot( m[ 2 ], m[ 2 ] ) );\n\ttransformedNormal = m * transformedNormal;\n#endif\ntransformedNormal = normalMatrix * transformedNormal;\n#ifdef FLIP_SIDED\n\ttransformedNormal = - transformedNormal;\n#endif\n#ifdef USE_TANGENT\n\tvec3 transformedTangent = ( modelViewMatrix * vec4( objectTangent, 0.0 ) ).xyz;\n\t#ifdef FLIP_SIDED\n\t\ttransformedTangent = - transformedTangent;\n\t#endif\n#endif";

var displacementmap_pars_vertex = "#ifdef USE_DISPLACEMENTMAP\n\tuniform sampler2D displacementMap;\n\tuniform float displacementScale;\n\tuniform float displacementBias;\n#endif";

var displacementmap_vertex = "#ifdef USE_DISPLACEMENTMAP\n\ttransformed += normalize( objectNormal ) * ( texture2D( displacementMap, vUv ).x * displacementScale + displacementBias );\n#endif";

var emissivemap_fragment = "#ifdef USE_EMISSIVEMAP\n\tvec4 emissiveColor = texture2D( emissiveMap, vUv );\n\temissiveColor.rgb = emissiveMapTexelToLinear( emissiveColor ).rgb;\n\ttotalEmissiveRadiance *= emissiveColor.rgb;\n#endif";

var emissivemap_pars_fragment = "#ifdef USE_EMISSIVEMAP\n\tuniform sampler2D emissiveMap;\n#endif";

var encodings_fragment = "gl_FragColor = linearToOutputTexel( gl_FragColor );";

var encodings_pars_fragment = "\nvec4 LinearToLinear( in vec4 value ) {\n\treturn value;\n}\nvec4 GammaToLinear( in vec4 value, in float gammaFactor ) {\n\treturn vec4( pow( value.rgb, vec3( gammaFactor ) ), value.a );\n}\nvec4 LinearToGamma( in vec4 value, in float gammaFactor ) {\n\treturn vec4( pow( value.rgb, vec3( 1.0 / gammaFactor ) ), value.a );\n}\nvec4 sRGBToLinear( in vec4 value ) {\n\treturn vec4( mix( pow( value.rgb * 0.9478672986 + vec3( 0.0521327014 ), vec3( 2.4 ) ), value.rgb * 0.0773993808, vec3( lessThanEqual( value.rgb, vec3( 0.04045 ) ) ) ), value.a );\n}\nvec4 LinearTosRGB( in vec4 value ) {\n\treturn vec4( mix( pow( value.rgb, vec3( 0.41666 ) ) * 1.055 - vec3( 0.055 ), value.rgb * 12.92, vec3( lessThanEqual( value.rgb, vec3( 0.0031308 ) ) ) ), value.a );\n}\nvec4 RGBEToLinear( in vec4 value ) {\n\treturn vec4( value.rgb * exp2( value.a * 255.0 - 128.0 ), 1.0 );\n}\nvec4 LinearToRGBE( in vec4 value ) {\n\tfloat maxComponent = max( max( value.r, value.g ), value.b );\n\tfloat fExp = clamp( ceil( log2( maxComponent ) ), -128.0, 127.0 );\n\treturn vec4( value.rgb / exp2( fExp ), ( fExp + 128.0 ) / 255.0 );\n}\nvec4 RGBMToLinear( in vec4 value, in float maxRange ) {\n\treturn vec4( value.rgb * value.a * maxRange, 1.0 );\n}\nvec4 LinearToRGBM( in vec4 value, in float maxRange ) {\n\tfloat maxRGB = max( value.r, max( value.g, value.b ) );\n\tfloat M = clamp( maxRGB / maxRange, 0.0, 1.0 );\n\tM = ceil( M * 255.0 ) / 255.0;\n\treturn vec4( value.rgb / ( M * maxRange ), M );\n}\nvec4 RGBDToLinear( in vec4 value, in float maxRange ) {\n\treturn vec4( value.rgb * ( ( maxRange / 255.0 ) / value.a ), 1.0 );\n}\nvec4 LinearToRGBD( in vec4 value, in float maxRange ) {\n\tfloat maxRGB = max( value.r, max( value.g, value.b ) );\n\tfloat D = max( maxRange / maxRGB, 1.0 );\n\tD = clamp( floor( D ) / 255.0, 0.0, 1.0 );\n\treturn vec4( value.rgb * ( D * ( 255.0 / maxRange ) ), D );\n}\nconst mat3 cLogLuvM = mat3( 0.2209, 0.3390, 0.4184, 0.1138, 0.6780, 0.7319, 0.0102, 0.1130, 0.2969 );\nvec4 LinearToLogLuv( in vec4 value ) {\n\tvec3 Xp_Y_XYZp = cLogLuvM * value.rgb;\n\tXp_Y_XYZp = max( Xp_Y_XYZp, vec3( 1e-6, 1e-6, 1e-6 ) );\n\tvec4 vResult;\n\tvResult.xy = Xp_Y_XYZp.xy / Xp_Y_XYZp.z;\n\tfloat Le = 2.0 * log2(Xp_Y_XYZp.y) + 127.0;\n\tvResult.w = fract( Le );\n\tvResult.z = ( Le - ( floor( vResult.w * 255.0 ) ) / 255.0 ) / 255.0;\n\treturn vResult;\n}\nconst mat3 cLogLuvInverseM = mat3( 6.0014, -2.7008, -1.7996, -1.3320, 3.1029, -5.7721, 0.3008, -1.0882, 5.6268 );\nvec4 LogLuvToLinear( in vec4 value ) {\n\tfloat Le = value.z * 255.0 + value.w;\n\tvec3 Xp_Y_XYZp;\n\tXp_Y_XYZp.y = exp2( ( Le - 127.0 ) / 2.0 );\n\tXp_Y_XYZp.z = Xp_Y_XYZp.y / value.y;\n\tXp_Y_XYZp.x = value.x * Xp_Y_XYZp.z;\n\tvec3 vRGB = cLogLuvInverseM * Xp_Y_XYZp.rgb;\n\treturn vec4( max( vRGB, 0.0 ), 1.0 );\n}";

var envmap_fragment = "#ifdef USE_ENVMAP\n\t#ifdef ENV_WORLDPOS\n\t\tvec3 cameraToFrag;\n\t\tif ( isOrthographic ) {\n\t\t\tcameraToFrag = normalize( vec3( - viewMatrix[ 0 ][ 2 ], - viewMatrix[ 1 ][ 2 ], - viewMatrix[ 2 ][ 2 ] ) );\n\t\t} else {\n\t\t\tcameraToFrag = normalize( vWorldPosition - cameraPosition );\n\t\t}\n\t\tvec3 worldNormal = inverseTransformDirection( normal, viewMatrix );\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvec3 reflectVec = reflect( cameraToFrag, worldNormal );\n\t\t#else\n\t\t\tvec3 reflectVec = refract( cameraToFrag, worldNormal, refractionRatio );\n\t\t#endif\n\t#else\n\t\tvec3 reflectVec = vReflect;\n\t#endif\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tvec4 envColor = textureCube( envMap, vec3( flipEnvMap * reflectVec.x, reflectVec.yz ) );\n\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\tvec4 envColor = textureCubeUV( envMap, reflectVec, 0.0 );\n\t#else\n\t\tvec4 envColor = vec4( 0.0 );\n\t#endif\n\t#ifndef ENVMAP_TYPE_CUBE_UV\n\t\tenvColor = envMapTexelToLinear( envColor );\n\t#endif\n\t#ifdef ENVMAP_BLENDING_MULTIPLY\n\t\toutgoingLight = mix( outgoingLight, outgoingLight * envColor.xyz, specularStrength * reflectivity );\n\t#elif defined( ENVMAP_BLENDING_MIX )\n\t\toutgoingLight = mix( outgoingLight, envColor.xyz, specularStrength * reflectivity );\n\t#elif defined( ENVMAP_BLENDING_ADD )\n\t\toutgoingLight += envColor.xyz * specularStrength * reflectivity;\n\t#endif\n#endif";

var envmap_common_pars_fragment = "#ifdef USE_ENVMAP\n\tuniform float envMapIntensity;\n\tuniform float flipEnvMap;\n\tuniform int maxMipLevel;\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tuniform samplerCube envMap;\n\t#else\n\t\tuniform sampler2D envMap;\n\t#endif\n\t\n#endif";

var envmap_pars_fragment = "#ifdef USE_ENVMAP\n\tuniform float reflectivity;\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG )\n\t\t#define ENV_WORLDPOS\n\t#endif\n\t#ifdef ENV_WORLDPOS\n\t\tvarying vec3 vWorldPosition;\n\t\tuniform float refractionRatio;\n\t#else\n\t\tvarying vec3 vReflect;\n\t#endif\n#endif";

var envmap_pars_vertex = "#ifdef USE_ENVMAP\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) ||defined( PHONG )\n\t\t#define ENV_WORLDPOS\n\t#endif\n\t#ifdef ENV_WORLDPOS\n\t\t\n\t\tvarying vec3 vWorldPosition;\n\t#else\n\t\tvarying vec3 vReflect;\n\t\tuniform float refractionRatio;\n\t#endif\n#endif";

var envmap_vertex = "#ifdef USE_ENVMAP\n\t#ifdef ENV_WORLDPOS\n\t\tvWorldPosition = worldPosition.xyz;\n\t#else\n\t\tvec3 cameraToVertex;\n\t\tif ( isOrthographic ) {\n\t\t\tcameraToVertex = normalize( vec3( - viewMatrix[ 0 ][ 2 ], - viewMatrix[ 1 ][ 2 ], - viewMatrix[ 2 ][ 2 ] ) );\n\t\t} else {\n\t\t\tcameraToVertex = normalize( worldPosition.xyz - cameraPosition );\n\t\t}\n\t\tvec3 worldNormal = inverseTransformDirection( transformedNormal, viewMatrix );\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvReflect = reflect( cameraToVertex, worldNormal );\n\t\t#else\n\t\t\tvReflect = refract( cameraToVertex, worldNormal, refractionRatio );\n\t\t#endif\n\t#endif\n#endif";

var fog_vertex = "#ifdef USE_FOG\n\tfogDepth = - mvPosition.z;\n#endif";

var fog_pars_vertex = "#ifdef USE_FOG\n\tvarying float fogDepth;\n#endif";

var fog_fragment = "#ifdef USE_FOG\n\t#ifdef FOG_EXP2\n\t\tfloat fogFactor = 1.0 - exp( - fogDensity * fogDensity * fogDepth * fogDepth );\n\t#else\n\t\tfloat fogFactor = smoothstep( fogNear, fogFar, fogDepth );\n\t#endif\n\tgl_FragColor.rgb = mix( gl_FragColor.rgb, fogColor, fogFactor );\n#endif";

var fog_pars_fragment = "#ifdef USE_FOG\n\tuniform vec3 fogColor;\n\tvarying float fogDepth;\n\t#ifdef FOG_EXP2\n\t\tuniform float fogDensity;\n\t#else\n\t\tuniform float fogNear;\n\t\tuniform float fogFar;\n\t#endif\n#endif";

var gradientmap_pars_fragment = "#ifdef USE_GRADIENTMAP\n\tuniform sampler2D gradientMap;\n#endif\nvec3 getGradientIrradiance( vec3 normal, vec3 lightDirection ) {\n\tfloat dotNL = dot( normal, lightDirection );\n\tvec2 coord = vec2( dotNL * 0.5 + 0.5, 0.0 );\n\t#ifdef USE_GRADIENTMAP\n\t\treturn texture2D( gradientMap, coord ).rgb;\n\t#else\n\t\treturn ( coord.x < 0.7 ) ? vec3( 0.7 ) : vec3( 1.0 );\n\t#endif\n}";

var lightmap_fragment = "#ifdef USE_LIGHTMAP\n\tvec4 lightMapTexel= texture2D( lightMap, vUv2 );\n\treflectedLight.indirectDiffuse += PI * lightMapTexelToLinear( lightMapTexel ).rgb * lightMapIntensity;\n#endif";

var lightmap_pars_fragment = "#ifdef USE_LIGHTMAP\n\tuniform sampler2D lightMap;\n\tuniform float lightMapIntensity;\n#endif";

var lights_lambert_vertex = "vec3 diffuse = vec3( 1.0 );\nGeometricContext geometry;\ngeometry.position = mvPosition.xyz;\ngeometry.normal = normalize( transformedNormal );\ngeometry.viewDir = ( isOrthographic ) ? vec3( 0, 0, 1 ) : normalize( -mvPosition.xyz );\nGeometricContext backGeometry;\nbackGeometry.position = geometry.position;\nbackGeometry.normal = -geometry.normal;\nbackGeometry.viewDir = geometry.viewDir;\nvLightFront = vec3( 0.0 );\nvIndirectFront = vec3( 0.0 );\n#ifdef DOUBLE_SIDED\n\tvLightBack = vec3( 0.0 );\n\tvIndirectBack = vec3( 0.0 );\n#endif\nIncidentLight directLight;\nfloat dotNL;\nvec3 directLightColor_Diffuse;\nvIndirectFront += getAmbientLightIrradiance( ambientLightColor );\nvIndirectFront += getLightProbeIrradiance( lightProbe, geometry );\n#ifdef DOUBLE_SIDED\n\tvIndirectBack += getAmbientLightIrradiance( ambientLightColor );\n\tvIndirectBack += getLightProbeIrradiance( lightProbe, backGeometry );\n#endif\n#if NUM_POINT_LIGHTS > 0\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tgetPointDirectLightIrradiance( pointLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if NUM_SPOT_LIGHTS > 0\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tgetSpotDirectLightIrradiance( spotLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if NUM_DIR_LIGHTS > 0\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tgetDirectionalDirectLightIrradiance( directionalLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if NUM_HEMI_LIGHTS > 0\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {\n\t\tvIndirectFront += getHemisphereLightIrradiance( hemisphereLights[ i ], geometry );\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvIndirectBack += getHemisphereLightIrradiance( hemisphereLights[ i ], backGeometry );\n\t\t#endif\n\t}\n\t#pragma unroll_loop_end\n#endif";

var lights_pars_begin = "uniform bool receiveShadow;\nuniform vec3 ambientLightColor;\nuniform vec3 lightProbe[ 9 ];\nvec3 shGetIrradianceAt( in vec3 normal, in vec3 shCoefficients[ 9 ] ) {\n\tfloat x = normal.x, y = normal.y, z = normal.z;\n\tvec3 result = shCoefficients[ 0 ] * 0.886227;\n\tresult += shCoefficients[ 1 ] * 2.0 * 0.511664 * y;\n\tresult += shCoefficients[ 2 ] * 2.0 * 0.511664 * z;\n\tresult += shCoefficients[ 3 ] * 2.0 * 0.511664 * x;\n\tresult += shCoefficients[ 4 ] * 2.0 * 0.429043 * x * y;\n\tresult += shCoefficients[ 5 ] * 2.0 * 0.429043 * y * z;\n\tresult += shCoefficients[ 6 ] * ( 0.743125 * z * z - 0.247708 );\n\tresult += shCoefficients[ 7 ] * 2.0 * 0.429043 * x * z;\n\tresult += shCoefficients[ 8 ] * 0.429043 * ( x * x - y * y );\n\treturn result;\n}\nvec3 getLightProbeIrradiance( const in vec3 lightProbe[ 9 ], const in GeometricContext geometry ) {\n\tvec3 worldNormal = inverseTransformDirection( geometry.normal, viewMatrix );\n\tvec3 irradiance = shGetIrradianceAt( worldNormal, lightProbe );\n\treturn irradiance;\n}\nvec3 getAmbientLightIrradiance( const in vec3 ambientLightColor ) {\n\tvec3 irradiance = ambientLightColor;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\treturn irradiance;\n}\n#if NUM_DIR_LIGHTS > 0\n\tstruct DirectionalLight {\n\t\tvec3 direction;\n\t\tvec3 color;\n\t};\n\tuniform DirectionalLight directionalLights[ NUM_DIR_LIGHTS ];\n\tvoid getDirectionalDirectLightIrradiance( const in DirectionalLight directionalLight, const in GeometricContext geometry, out IncidentLight directLight ) {\n\t\tdirectLight.color = directionalLight.color;\n\t\tdirectLight.direction = directionalLight.direction;\n\t\tdirectLight.visible = true;\n\t}\n#endif\n#if NUM_POINT_LIGHTS > 0\n\tstruct PointLight {\n\t\tvec3 position;\n\t\tvec3 color;\n\t\tfloat distance;\n\t\tfloat decay;\n\t};\n\tuniform PointLight pointLights[ NUM_POINT_LIGHTS ];\n\tvoid getPointDirectLightIrradiance( const in PointLight pointLight, const in GeometricContext geometry, out IncidentLight directLight ) {\n\t\tvec3 lVector = pointLight.position - geometry.position;\n\t\tdirectLight.direction = normalize( lVector );\n\t\tfloat lightDistance = length( lVector );\n\t\tdirectLight.color = pointLight.color;\n\t\tdirectLight.color *= punctualLightIntensityToIrradianceFactor( lightDistance, pointLight.distance, pointLight.decay );\n\t\tdirectLight.visible = ( directLight.color != vec3( 0.0 ) );\n\t}\n#endif\n#if NUM_SPOT_LIGHTS > 0\n\tstruct SpotLight {\n\t\tvec3 position;\n\t\tvec3 direction;\n\t\tvec3 color;\n\t\tfloat distance;\n\t\tfloat decay;\n\t\tfloat coneCos;\n\t\tfloat penumbraCos;\n\t};\n\tuniform SpotLight spotLights[ NUM_SPOT_LIGHTS ];\n\tvoid getSpotDirectLightIrradiance( const in SpotLight spotLight, const in GeometricContext geometry, out IncidentLight directLight ) {\n\t\tvec3 lVector = spotLight.position - geometry.position;\n\t\tdirectLight.direction = normalize( lVector );\n\t\tfloat lightDistance = length( lVector );\n\t\tfloat angleCos = dot( directLight.direction, spotLight.direction );\n\t\tif ( angleCos > spotLight.coneCos ) {\n\t\t\tfloat spotEffect = smoothstep( spotLight.coneCos, spotLight.penumbraCos, angleCos );\n\t\t\tdirectLight.color = spotLight.color;\n\t\t\tdirectLight.color *= spotEffect * punctualLightIntensityToIrradianceFactor( lightDistance, spotLight.distance, spotLight.decay );\n\t\t\tdirectLight.visible = true;\n\t\t} else {\n\t\t\tdirectLight.color = vec3( 0.0 );\n\t\t\tdirectLight.visible = false;\n\t\t}\n\t}\n#endif\n#if NUM_RECT_AREA_LIGHTS > 0\n\tstruct RectAreaLight {\n\t\tvec3 color;\n\t\tvec3 position;\n\t\tvec3 halfWidth;\n\t\tvec3 halfHeight;\n\t};\n\tuniform sampler2D ltc_1;\tuniform sampler2D ltc_2;\n\tuniform RectAreaLight rectAreaLights[ NUM_RECT_AREA_LIGHTS ];\n#endif\n#if NUM_HEMI_LIGHTS > 0\n\tstruct HemisphereLight {\n\t\tvec3 direction;\n\t\tvec3 skyColor;\n\t\tvec3 groundColor;\n\t};\n\tuniform HemisphereLight hemisphereLights[ NUM_HEMI_LIGHTS ];\n\tvec3 getHemisphereLightIrradiance( const in HemisphereLight hemiLight, const in GeometricContext geometry ) {\n\t\tfloat dotNL = dot( geometry.normal, hemiLight.direction );\n\t\tfloat hemiDiffuseWeight = 0.5 * dotNL + 0.5;\n\t\tvec3 irradiance = mix( hemiLight.groundColor, hemiLight.skyColor, hemiDiffuseWeight );\n\t\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\t\tirradiance *= PI;\n\t\t#endif\n\t\treturn irradiance;\n\t}\n#endif";

var envmap_physical_pars_fragment = "#if defined( USE_ENVMAP )\n\t#ifdef ENVMAP_MODE_REFRACTION\n\t\tuniform float refractionRatio;\n\t#endif\n\tvec3 getLightProbeIndirectIrradiance( const in GeometricContext geometry, const in int maxMIPLevel ) {\n\t\tvec3 worldNormal = inverseTransformDirection( geometry.normal, viewMatrix );\n\t\t#ifdef ENVMAP_TYPE_CUBE\n\t\t\tvec3 queryVec = vec3( flipEnvMap * worldNormal.x, worldNormal.yz );\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = textureCubeLodEXT( envMap, queryVec, float( maxMIPLevel ) );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = textureCube( envMap, queryVec, float( maxMIPLevel ) );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\t\tvec4 envMapColor = textureCubeUV( envMap, worldNormal, 1.0 );\n\t\t#else\n\t\t\tvec4 envMapColor = vec4( 0.0 );\n\t\t#endif\n\t\treturn PI * envMapColor.rgb * envMapIntensity;\n\t}\n\tfloat getSpecularMIPLevel( const in float roughness, const in int maxMIPLevel ) {\n\t\tfloat maxMIPLevelScalar = float( maxMIPLevel );\n\t\tfloat sigma = PI * roughness * roughness / ( 1.0 + roughness );\n\t\tfloat desiredMIPLevel = maxMIPLevelScalar + log2( sigma );\n\t\treturn clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );\n\t}\n\tvec3 getLightProbeIndirectRadiance( const in vec3 viewDir, const in vec3 normal, const in float roughness, const in int maxMIPLevel ) {\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvec3 reflectVec = reflect( -viewDir, normal );\n\t\t\treflectVec = normalize( mix( reflectVec, normal, roughness * roughness) );\n\t\t#else\n\t\t\tvec3 reflectVec = refract( -viewDir, normal, refractionRatio );\n\t\t#endif\n\t\treflectVec = inverseTransformDirection( reflectVec, viewMatrix );\n\t\tfloat specularMIPLevel = getSpecularMIPLevel( roughness, maxMIPLevel );\n\t\t#ifdef ENVMAP_TYPE_CUBE\n\t\t\tvec3 queryReflectVec = vec3( flipEnvMap * reflectVec.x, reflectVec.yz );\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = textureCubeLodEXT( envMap, queryReflectVec, specularMIPLevel );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = textureCube( envMap, queryReflectVec, specularMIPLevel );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\t\tvec4 envMapColor = textureCubeUV( envMap, reflectVec, roughness );\n\t\t#endif\n\t\treturn envMapColor.rgb * envMapIntensity;\n\t}\n#endif";

var lights_toon_fragment = "ToonMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb;";

var lights_toon_pars_fragment = "varying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\nstruct ToonMaterial {\n\tvec3 diffuseColor;\n};\nvoid RE_Direct_Toon( const in IncidentLight directLight, const in GeometricContext geometry, const in ToonMaterial material, inout ReflectedLight reflectedLight ) {\n\tvec3 irradiance = getGradientIrradiance( geometry.normal, directLight.direction ) * directLight.color;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\treflectedLight.directDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectDiffuse_Toon( const in vec3 irradiance, const in GeometricContext geometry, const in ToonMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\n#define RE_Direct\t\t\t\tRE_Direct_Toon\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_Toon\n#define Material_LightProbeLOD( material )\t(0)";

var lights_phong_fragment = "BlinnPhongMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb;\nmaterial.specularColor = specular;\nmaterial.specularShininess = shininess;\nmaterial.specularStrength = specularStrength;";

var lights_phong_pars_fragment = "varying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\nstruct BlinnPhongMaterial {\n\tvec3 diffuseColor;\n\tvec3 specularColor;\n\tfloat specularShininess;\n\tfloat specularStrength;\n};\nvoid RE_Direct_BlinnPhong( const in IncidentLight directLight, const in GeometricContext geometry, const in BlinnPhongMaterial material, inout ReflectedLight reflectedLight ) {\n\tfloat dotNL = saturate( dot( geometry.normal, directLight.direction ) );\n\tvec3 irradiance = dotNL * directLight.color;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\treflectedLight.directDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n\treflectedLight.directSpecular += irradiance * BRDF_Specular_BlinnPhong( directLight, geometry, material.specularColor, material.specularShininess ) * material.specularStrength;\n}\nvoid RE_IndirectDiffuse_BlinnPhong( const in vec3 irradiance, const in GeometricContext geometry, const in BlinnPhongMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\n#define RE_Direct\t\t\t\tRE_Direct_BlinnPhong\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_BlinnPhong\n#define Material_LightProbeLOD( material )\t(0)";

var lights_physical_fragment = "PhysicalMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb * ( 1.0 - metalnessFactor );\nvec3 dxy = max( abs( dFdx( geometryNormal ) ), abs( dFdy( geometryNormal ) ) );\nfloat geometryRoughness = max( max( dxy.x, dxy.y ), dxy.z );\nmaterial.specularRoughness = max( roughnessFactor, 0.0525 );material.specularRoughness += geometryRoughness;\nmaterial.specularRoughness = min( material.specularRoughness, 1.0 );\n#ifdef REFLECTIVITY\n\tmaterial.specularColor = mix( vec3( MAXIMUM_SPECULAR_COEFFICIENT * pow2( reflectivity ) ), diffuseColor.rgb, metalnessFactor );\n#else\n\tmaterial.specularColor = mix( vec3( DEFAULT_SPECULAR_COEFFICIENT ), diffuseColor.rgb, metalnessFactor );\n#endif\n#ifdef CLEARCOAT\n\tmaterial.clearcoat = clearcoat;\n\tmaterial.clearcoatRoughness = clearcoatRoughness;\n\t#ifdef USE_CLEARCOATMAP\n\t\tmaterial.clearcoat *= texture2D( clearcoatMap, vUv ).x;\n\t#endif\n\t#ifdef USE_CLEARCOAT_ROUGHNESSMAP\n\t\tmaterial.clearcoatRoughness *= texture2D( clearcoatRoughnessMap, vUv ).y;\n\t#endif\n\tmaterial.clearcoat = saturate( material.clearcoat );\tmaterial.clearcoatRoughness = max( material.clearcoatRoughness, 0.0525 );\n\tmaterial.clearcoatRoughness += geometryRoughness;\n\tmaterial.clearcoatRoughness = min( material.clearcoatRoughness, 1.0 );\n#endif\n#ifdef USE_SHEEN\n\tmaterial.sheenColor = sheen;\n#endif";

var lights_physical_pars_fragment = "struct PhysicalMaterial {\n\tvec3 diffuseColor;\n\tfloat specularRoughness;\n\tvec3 specularColor;\n#ifdef CLEARCOAT\n\tfloat clearcoat;\n\tfloat clearcoatRoughness;\n#endif\n#ifdef USE_SHEEN\n\tvec3 sheenColor;\n#endif\n};\n#define MAXIMUM_SPECULAR_COEFFICIENT 0.16\n#define DEFAULT_SPECULAR_COEFFICIENT 0.04\nfloat clearcoatDHRApprox( const in float roughness, const in float dotNL ) {\n\treturn DEFAULT_SPECULAR_COEFFICIENT + ( 1.0 - DEFAULT_SPECULAR_COEFFICIENT ) * ( pow( 1.0 - dotNL, 5.0 ) * pow( 1.0 - roughness, 2.0 ) );\n}\n#if NUM_RECT_AREA_LIGHTS > 0\n\tvoid RE_Direct_RectArea_Physical( const in RectAreaLight rectAreaLight, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\t\tvec3 normal = geometry.normal;\n\t\tvec3 viewDir = geometry.viewDir;\n\t\tvec3 position = geometry.position;\n\t\tvec3 lightPos = rectAreaLight.position;\n\t\tvec3 halfWidth = rectAreaLight.halfWidth;\n\t\tvec3 halfHeight = rectAreaLight.halfHeight;\n\t\tvec3 lightColor = rectAreaLight.color;\n\t\tfloat roughness = material.specularRoughness;\n\t\tvec3 rectCoords[ 4 ];\n\t\trectCoords[ 0 ] = lightPos + halfWidth - halfHeight;\t\trectCoords[ 1 ] = lightPos - halfWidth - halfHeight;\n\t\trectCoords[ 2 ] = lightPos - halfWidth + halfHeight;\n\t\trectCoords[ 3 ] = lightPos + halfWidth + halfHeight;\n\t\tvec2 uv = LTC_Uv( normal, viewDir, roughness );\n\t\tvec4 t1 = texture2D( ltc_1, uv );\n\t\tvec4 t2 = texture2D( ltc_2, uv );\n\t\tmat3 mInv = mat3(\n\t\t\tvec3( t1.x, 0, t1.y ),\n\t\t\tvec3(    0, 1,    0 ),\n\t\t\tvec3( t1.z, 0, t1.w )\n\t\t);\n\t\tvec3 fresnel = ( material.specularColor * t2.x + ( vec3( 1.0 ) - material.specularColor ) * t2.y );\n\t\treflectedLight.directSpecular += lightColor * fresnel * LTC_Evaluate( normal, viewDir, position, mInv, rectCoords );\n\t\treflectedLight.directDiffuse += lightColor * material.diffuseColor * LTC_Evaluate( normal, viewDir, position, mat3( 1.0 ), rectCoords );\n\t}\n#endif\nvoid RE_Direct_Physical( const in IncidentLight directLight, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\tfloat dotNL = saturate( dot( geometry.normal, directLight.direction ) );\n\tvec3 irradiance = dotNL * directLight.color;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\t#ifdef CLEARCOAT\n\t\tfloat ccDotNL = saturate( dot( geometry.clearcoatNormal, directLight.direction ) );\n\t\tvec3 ccIrradiance = ccDotNL * directLight.color;\n\t\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\t\tccIrradiance *= PI;\n\t\t#endif\n\t\tfloat clearcoatDHR = material.clearcoat * clearcoatDHRApprox( material.clearcoatRoughness, ccDotNL );\n\t\treflectedLight.directSpecular += ccIrradiance * material.clearcoat * BRDF_Specular_GGX( directLight, geometry.viewDir, geometry.clearcoatNormal, vec3( DEFAULT_SPECULAR_COEFFICIENT ), material.clearcoatRoughness );\n\t#else\n\t\tfloat clearcoatDHR = 0.0;\n\t#endif\n\t#ifdef USE_SHEEN\n\t\treflectedLight.directSpecular += ( 1.0 - clearcoatDHR ) * irradiance * BRDF_Specular_Sheen(\n\t\t\tmaterial.specularRoughness,\n\t\t\tdirectLight.direction,\n\t\t\tgeometry,\n\t\t\tmaterial.sheenColor\n\t\t);\n\t#else\n\t\treflectedLight.directSpecular += ( 1.0 - clearcoatDHR ) * irradiance * BRDF_Specular_GGX( directLight, geometry.viewDir, geometry.normal, material.specularColor, material.specularRoughness);\n\t#endif\n\treflectedLight.directDiffuse += ( 1.0 - clearcoatDHR ) * irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectDiffuse_Physical( const in vec3 irradiance, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectSpecular_Physical( const in vec3 radiance, const in vec3 irradiance, const in vec3 clearcoatRadiance, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight) {\n\t#ifdef CLEARCOAT\n\t\tfloat ccDotNV = saturate( dot( geometry.clearcoatNormal, geometry.viewDir ) );\n\t\treflectedLight.indirectSpecular += clearcoatRadiance * material.clearcoat * BRDF_Specular_GGX_Environment( geometry.viewDir, geometry.clearcoatNormal, vec3( DEFAULT_SPECULAR_COEFFICIENT ), material.clearcoatRoughness );\n\t\tfloat ccDotNL = ccDotNV;\n\t\tfloat clearcoatDHR = material.clearcoat * clearcoatDHRApprox( material.clearcoatRoughness, ccDotNL );\n\t#else\n\t\tfloat clearcoatDHR = 0.0;\n\t#endif\n\tfloat clearcoatInv = 1.0 - clearcoatDHR;\n\tvec3 singleScattering = vec3( 0.0 );\n\tvec3 multiScattering = vec3( 0.0 );\n\tvec3 cosineWeightedIrradiance = irradiance * RECIPROCAL_PI;\n\tBRDF_Specular_Multiscattering_Environment( geometry, material.specularColor, material.specularRoughness, singleScattering, multiScattering );\n\tvec3 diffuse = material.diffuseColor * ( 1.0 - ( singleScattering + multiScattering ) );\n\treflectedLight.indirectSpecular += clearcoatInv * radiance * singleScattering;\n\treflectedLight.indirectSpecular += multiScattering * cosineWeightedIrradiance;\n\treflectedLight.indirectDiffuse += diffuse * cosineWeightedIrradiance;\n}\n#define RE_Direct\t\t\t\tRE_Direct_Physical\n#define RE_Direct_RectArea\t\tRE_Direct_RectArea_Physical\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_Physical\n#define RE_IndirectSpecular\t\tRE_IndirectSpecular_Physical\nfloat computeSpecularOcclusion( const in float dotNV, const in float ambientOcclusion, const in float roughness ) {\n\treturn saturate( pow( dotNV + ambientOcclusion, exp2( - 16.0 * roughness - 1.0 ) ) - 1.0 + ambientOcclusion );\n}";

var lights_fragment_begin = "\nGeometricContext geometry;\ngeometry.position = - vViewPosition;\ngeometry.normal = normal;\ngeometry.viewDir = ( isOrthographic ) ? vec3( 0, 0, 1 ) : normalize( vViewPosition );\n#ifdef CLEARCOAT\n\tgeometry.clearcoatNormal = clearcoatNormal;\n#endif\nIncidentLight directLight;\n#if ( NUM_POINT_LIGHTS > 0 ) && defined( RE_Direct )\n\tPointLight pointLight;\n\t#if defined( USE_SHADOWMAP ) && NUM_POINT_LIGHT_SHADOWS > 0\n\tPointLightShadow pointLightShadow;\n\t#endif\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tpointLight = pointLights[ i ];\n\t\tgetPointDirectLightIrradiance( pointLight, geometry, directLight );\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_POINT_LIGHT_SHADOWS )\n\t\tpointLightShadow = pointLightShadows[ i ];\n\t\tdirectLight.color *= all( bvec2( directLight.visible, receiveShadow ) ) ? getPointShadow( pointShadowMap[ i ], pointLightShadow.shadowMapSize, pointLightShadow.shadowBias, pointLightShadow.shadowRadius, vPointShadowCoord[ i ], pointLightShadow.shadowCameraNear, pointLightShadow.shadowCameraFar ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if ( NUM_SPOT_LIGHTS > 0 ) && defined( RE_Direct )\n\tSpotLight spotLight;\n\t#if defined( USE_SHADOWMAP ) && NUM_SPOT_LIGHT_SHADOWS > 0\n\tSpotLightShadow spotLightShadow;\n\t#endif\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tspotLight = spotLights[ i ];\n\t\tgetSpotDirectLightIrradiance( spotLight, geometry, directLight );\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_SPOT_LIGHT_SHADOWS )\n\t\tspotLightShadow = spotLightShadows[ i ];\n\t\tdirectLight.color *= all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( spotShadowMap[ i ], spotLightShadow.shadowMapSize, spotLightShadow.shadowBias, spotLightShadow.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if ( NUM_DIR_LIGHTS > 0 ) && defined( RE_Direct )\n\tDirectionalLight directionalLight;\n\t#if defined( USE_SHADOWMAP ) && NUM_DIR_LIGHT_SHADOWS > 0\n\tDirectionalLightShadow directionalLightShadow;\n\t#endif\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tdirectionalLight = directionalLights[ i ];\n\t\tgetDirectionalDirectLightIrradiance( directionalLight, geometry, directLight );\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_DIR_LIGHT_SHADOWS )\n\t\tdirectionalLightShadow = directionalLightShadows[ i ];\n\t\tdirectLight.color *= all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( directionalShadowMap[ i ], directionalLightShadow.shadowMapSize, directionalLightShadow.shadowBias, directionalLightShadow.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if ( NUM_RECT_AREA_LIGHTS > 0 ) && defined( RE_Direct_RectArea )\n\tRectAreaLight rectAreaLight;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_RECT_AREA_LIGHTS; i ++ ) {\n\t\trectAreaLight = rectAreaLights[ i ];\n\t\tRE_Direct_RectArea( rectAreaLight, geometry, material, reflectedLight );\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if defined( RE_IndirectDiffuse )\n\tvec3 iblIrradiance = vec3( 0.0 );\n\tvec3 irradiance = getAmbientLightIrradiance( ambientLightColor );\n\tirradiance += getLightProbeIrradiance( lightProbe, geometry );\n\t#if ( NUM_HEMI_LIGHTS > 0 )\n\t\t#pragma unroll_loop_start\n\t\tfor ( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {\n\t\t\tirradiance += getHemisphereLightIrradiance( hemisphereLights[ i ], geometry );\n\t\t}\n\t\t#pragma unroll_loop_end\n\t#endif\n#endif\n#if defined( RE_IndirectSpecular )\n\tvec3 radiance = vec3( 0.0 );\n\tvec3 clearcoatRadiance = vec3( 0.0 );\n#endif";

var lights_fragment_maps = "#if defined( RE_IndirectDiffuse )\n\t#ifdef USE_LIGHTMAP\n\t\tvec4 lightMapTexel= texture2D( lightMap, vUv2 );\n\t\tvec3 lightMapIrradiance = lightMapTexelToLinear( lightMapTexel ).rgb * lightMapIntensity;\n\t\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\t\tlightMapIrradiance *= PI;\n\t\t#endif\n\t\tirradiance += lightMapIrradiance;\n\t#endif\n\t#if defined( USE_ENVMAP ) && defined( STANDARD ) && defined( ENVMAP_TYPE_CUBE_UV )\n\t\tiblIrradiance += getLightProbeIndirectIrradiance( geometry, maxMipLevel );\n\t#endif\n#endif\n#if defined( USE_ENVMAP ) && defined( RE_IndirectSpecular )\n\tradiance += getLightProbeIndirectRadiance( geometry.viewDir, geometry.normal, material.specularRoughness, maxMipLevel );\n\t#ifdef CLEARCOAT\n\t\tclearcoatRadiance += getLightProbeIndirectRadiance( geometry.viewDir, geometry.clearcoatNormal, material.clearcoatRoughness, maxMipLevel );\n\t#endif\n#endif";

var lights_fragment_end = "#if defined( RE_IndirectDiffuse )\n\tRE_IndirectDiffuse( irradiance, geometry, material, reflectedLight );\n#endif\n#if defined( RE_IndirectSpecular )\n\tRE_IndirectSpecular( radiance, iblIrradiance, clearcoatRadiance, geometry, material, reflectedLight );\n#endif";

var logdepthbuf_fragment = "#if defined( USE_LOGDEPTHBUF ) && defined( USE_LOGDEPTHBUF_EXT )\n\tgl_FragDepthEXT = vIsPerspective == 0.0 ? gl_FragCoord.z : log2( vFragDepth ) * logDepthBufFC * 0.5;\n#endif";

var logdepthbuf_pars_fragment = "#if defined( USE_LOGDEPTHBUF ) && defined( USE_LOGDEPTHBUF_EXT )\n\tuniform float logDepthBufFC;\n\tvarying float vFragDepth;\n\tvarying float vIsPerspective;\n#endif";

var logdepthbuf_pars_vertex = "#ifdef USE_LOGDEPTHBUF\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvarying float vFragDepth;\n\t\tvarying float vIsPerspective;\n\t#else\n\t\tuniform float logDepthBufFC;\n\t#endif\n#endif";

var logdepthbuf_vertex = "#ifdef USE_LOGDEPTHBUF\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvFragDepth = 1.0 + gl_Position.w;\n\t\tvIsPerspective = float( isPerspectiveMatrix( projectionMatrix ) );\n\t#else\n\t\tif ( isPerspectiveMatrix( projectionMatrix ) ) {\n\t\t\tgl_Position.z = log2( max( EPSILON, gl_Position.w + 1.0 ) ) * logDepthBufFC - 1.0;\n\t\t\tgl_Position.z *= gl_Position.w;\n\t\t}\n\t#endif\n#endif";

var map_fragment = "#ifdef USE_MAP\n\tvec4 texelColor = texture2D( map, vUv );\n\ttexelColor = mapTexelToLinear( texelColor );\n\tdiffuseColor *= texelColor;\n#endif";

var map_pars_fragment = "#ifdef USE_MAP\n\tuniform sampler2D map;\n#endif";

var map_particle_fragment = "#if defined( USE_MAP ) || defined( USE_ALPHAMAP )\n\tvec2 uv = ( uvTransform * vec3( gl_PointCoord.x, 1.0 - gl_PointCoord.y, 1 ) ).xy;\n#endif\n#ifdef USE_MAP\n\tvec4 mapTexel = texture2D( map, uv );\n\tdiffuseColor *= mapTexelToLinear( mapTexel );\n#endif\n#ifdef USE_ALPHAMAP\n\tdiffuseColor.a *= texture2D( alphaMap, uv ).g;\n#endif";

var map_particle_pars_fragment = "#if defined( USE_MAP ) || defined( USE_ALPHAMAP )\n\tuniform mat3 uvTransform;\n#endif\n#ifdef USE_MAP\n\tuniform sampler2D map;\n#endif\n#ifdef USE_ALPHAMAP\n\tuniform sampler2D alphaMap;\n#endif";

var metalnessmap_fragment = "float metalnessFactor = metalness;\n#ifdef USE_METALNESSMAP\n\tvec4 texelMetalness = texture2D( metalnessMap, vUv );\n\tmetalnessFactor *= texelMetalness.b;\n#endif";

var metalnessmap_pars_fragment = "#ifdef USE_METALNESSMAP\n\tuniform sampler2D metalnessMap;\n#endif";

var morphnormal_vertex = "#ifdef USE_MORPHNORMALS\n\tobjectNormal *= morphTargetBaseInfluence;\n\tobjectNormal += morphNormal0 * morphTargetInfluences[ 0 ];\n\tobjectNormal += morphNormal1 * morphTargetInfluences[ 1 ];\n\tobjectNormal += morphNormal2 * morphTargetInfluences[ 2 ];\n\tobjectNormal += morphNormal3 * morphTargetInfluences[ 3 ];\n#endif";

var morphtarget_pars_vertex = "#ifdef USE_MORPHTARGETS\n\tuniform float morphTargetBaseInfluence;\n\t#ifndef USE_MORPHNORMALS\n\t\tuniform float morphTargetInfluences[ 8 ];\n\t#else\n\t\tuniform float morphTargetInfluences[ 4 ];\n\t#endif\n#endif";

var morphtarget_vertex = "#ifdef USE_MORPHTARGETS\n\ttransformed *= morphTargetBaseInfluence;\n\ttransformed += morphTarget0 * morphTargetInfluences[ 0 ];\n\ttransformed += morphTarget1 * morphTargetInfluences[ 1 ];\n\ttransformed += morphTarget2 * morphTargetInfluences[ 2 ];\n\ttransformed += morphTarget3 * morphTargetInfluences[ 3 ];\n\t#ifndef USE_MORPHNORMALS\n\t\ttransformed += morphTarget4 * morphTargetInfluences[ 4 ];\n\t\ttransformed += morphTarget5 * morphTargetInfluences[ 5 ];\n\t\ttransformed += morphTarget6 * morphTargetInfluences[ 6 ];\n\t\ttransformed += morphTarget7 * morphTargetInfluences[ 7 ];\n\t#endif\n#endif";

var normal_fragment_begin = "#ifdef FLAT_SHADED\n\tvec3 fdx = vec3( dFdx( vViewPosition.x ), dFdx( vViewPosition.y ), dFdx( vViewPosition.z ) );\n\tvec3 fdy = vec3( dFdy( vViewPosition.x ), dFdy( vViewPosition.y ), dFdy( vViewPosition.z ) );\n\tvec3 normal = normalize( cross( fdx, fdy ) );\n#else\n\tvec3 normal = normalize( vNormal );\n\t#ifdef DOUBLE_SIDED\n\t\tnormal = normal * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t#endif\n\t#ifdef USE_TANGENT\n\t\tvec3 tangent = normalize( vTangent );\n\t\tvec3 bitangent = normalize( vBitangent );\n\t\t#ifdef DOUBLE_SIDED\n\t\t\ttangent = tangent * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\t\tbitangent = bitangent * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\t#endif\n\t\t#if defined( TANGENTSPACE_NORMALMAP ) || defined( USE_CLEARCOAT_NORMALMAP )\n\t\t\tmat3 vTBN = mat3( tangent, bitangent, normal );\n\t\t#endif\n\t#endif\n#endif\nvec3 geometryNormal = normal;";

var normal_fragment_maps = "#ifdef OBJECTSPACE_NORMALMAP\n\tnormal = texture2D( normalMap, vUv ).xyz * 2.0 - 1.0;\n\t#ifdef FLIP_SIDED\n\t\tnormal = - normal;\n\t#endif\n\t#ifdef DOUBLE_SIDED\n\t\tnormal = normal * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t#endif\n\tnormal = normalize( normalMatrix * normal );\n#elif defined( TANGENTSPACE_NORMALMAP )\n\tvec3 mapN = texture2D( normalMap, vUv ).xyz * 2.0 - 1.0;\n\tmapN.xy *= normalScale;\n\t#ifdef USE_TANGENT\n\t\tnormal = normalize( vTBN * mapN );\n\t#else\n\t\tnormal = perturbNormal2Arb( -vViewPosition, normal, mapN );\n\t#endif\n#elif defined( USE_BUMPMAP )\n\tnormal = perturbNormalArb( -vViewPosition, normal, dHdxy_fwd() );\n#endif";

var normalmap_pars_fragment = "#ifdef USE_NORMALMAP\n\tuniform sampler2D normalMap;\n\tuniform vec2 normalScale;\n#endif\n#ifdef OBJECTSPACE_NORMALMAP\n\tuniform mat3 normalMatrix;\n#endif\n#if ! defined ( USE_TANGENT ) && ( defined ( TANGENTSPACE_NORMALMAP ) || defined ( USE_CLEARCOAT_NORMALMAP ) )\n\tvec3 perturbNormal2Arb( vec3 eye_pos, vec3 surf_norm, vec3 mapN ) {\n\t\tvec3 q0 = vec3( dFdx( eye_pos.x ), dFdx( eye_pos.y ), dFdx( eye_pos.z ) );\n\t\tvec3 q1 = vec3( dFdy( eye_pos.x ), dFdy( eye_pos.y ), dFdy( eye_pos.z ) );\n\t\tvec2 st0 = dFdx( vUv.st );\n\t\tvec2 st1 = dFdy( vUv.st );\n\t\tfloat scale = sign( st1.t * st0.s - st0.t * st1.s );\n\t\tvec3 S = normalize( ( q0 * st1.t - q1 * st0.t ) * scale );\n\t\tvec3 T = normalize( ( - q0 * st1.s + q1 * st0.s ) * scale );\n\t\tvec3 N = normalize( surf_norm );\n\t\tmat3 tsn = mat3( S, T, N );\n\t\tmapN.xy *= ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\treturn normalize( tsn * mapN );\n\t}\n#endif";

var clearcoat_normal_fragment_begin = "#ifdef CLEARCOAT\n\tvec3 clearcoatNormal = geometryNormal;\n#endif";

var clearcoat_normal_fragment_maps = "#ifdef USE_CLEARCOAT_NORMALMAP\n\tvec3 clearcoatMapN = texture2D( clearcoatNormalMap, vUv ).xyz * 2.0 - 1.0;\n\tclearcoatMapN.xy *= clearcoatNormalScale;\n\t#ifdef USE_TANGENT\n\t\tclearcoatNormal = normalize( vTBN * clearcoatMapN );\n\t#else\n\t\tclearcoatNormal = perturbNormal2Arb( - vViewPosition, clearcoatNormal, clearcoatMapN );\n\t#endif\n#endif";

var clearcoat_pars_fragment = "#ifdef USE_CLEARCOATMAP\n\tuniform sampler2D clearcoatMap;\n#endif\n#ifdef USE_CLEARCOAT_ROUGHNESSMAP\n\tuniform sampler2D clearcoatRoughnessMap;\n#endif\n#ifdef USE_CLEARCOAT_NORMALMAP\n\tuniform sampler2D clearcoatNormalMap;\n\tuniform vec2 clearcoatNormalScale;\n#endif";

var packing = "vec3 packNormalToRGB( const in vec3 normal ) {\n\treturn normalize( normal ) * 0.5 + 0.5;\n}\nvec3 unpackRGBToNormal( const in vec3 rgb ) {\n\treturn 2.0 * rgb.xyz - 1.0;\n}\nconst float PackUpscale = 256. / 255.;const float UnpackDownscale = 255. / 256.;\nconst vec3 PackFactors = vec3( 256. * 256. * 256., 256. * 256., 256. );\nconst vec4 UnpackFactors = UnpackDownscale / vec4( PackFactors, 1. );\nconst float ShiftRight8 = 1. / 256.;\nvec4 packDepthToRGBA( const in float v ) {\n\tvec4 r = vec4( fract( v * PackFactors ), v );\n\tr.yzw -= r.xyz * ShiftRight8;\treturn r * PackUpscale;\n}\nfloat unpackRGBAToDepth( const in vec4 v ) {\n\treturn dot( v, UnpackFactors );\n}\nvec4 pack2HalfToRGBA( vec2 v ) {\n\tvec4 r = vec4( v.x, fract( v.x * 255.0 ), v.y, fract( v.y * 255.0 ));\n\treturn vec4( r.x - r.y / 255.0, r.y, r.z - r.w / 255.0, r.w);\n}\nvec2 unpackRGBATo2Half( vec4 v ) {\n\treturn vec2( v.x + ( v.y / 255.0 ), v.z + ( v.w / 255.0 ) );\n}\nfloat viewZToOrthographicDepth( const in float viewZ, const in float near, const in float far ) {\n\treturn ( viewZ + near ) / ( near - far );\n}\nfloat orthographicDepthToViewZ( const in float linearClipZ, const in float near, const in float far ) {\n\treturn linearClipZ * ( near - far ) - near;\n}\nfloat viewZToPerspectiveDepth( const in float viewZ, const in float near, const in float far ) {\n\treturn (( near + viewZ ) * far ) / (( far - near ) * viewZ );\n}\nfloat perspectiveDepthToViewZ( const in float invClipZ, const in float near, const in float far ) {\n\treturn ( near * far ) / ( ( far - near ) * invClipZ - far );\n}";

var premultiplied_alpha_fragment = "#ifdef PREMULTIPLIED_ALPHA\n\tgl_FragColor.rgb *= gl_FragColor.a;\n#endif";

var project_vertex = "vec4 mvPosition = vec4( transformed, 1.0 );\n#ifdef USE_INSTANCING\n\tmvPosition = instanceMatrix * mvPosition;\n#endif\nmvPosition = modelViewMatrix * mvPosition;\ngl_Position = projectionMatrix * mvPosition;";

var dithering_fragment = "#ifdef DITHERING\n\tgl_FragColor.rgb = dithering( gl_FragColor.rgb );\n#endif";

var dithering_pars_fragment = "#ifdef DITHERING\n\tvec3 dithering( vec3 color ) {\n\t\tfloat grid_position = rand( gl_FragCoord.xy );\n\t\tvec3 dither_shift_RGB = vec3( 0.25 / 255.0, -0.25 / 255.0, 0.25 / 255.0 );\n\t\tdither_shift_RGB = mix( 2.0 * dither_shift_RGB, -2.0 * dither_shift_RGB, grid_position );\n\t\treturn color + dither_shift_RGB;\n\t}\n#endif";

var roughnessmap_fragment = "float roughnessFactor = roughness;\n#ifdef USE_ROUGHNESSMAP\n\tvec4 texelRoughness = texture2D( roughnessMap, vUv );\n\troughnessFactor *= texelRoughness.g;\n#endif";

var roughnessmap_pars_fragment = "#ifdef USE_ROUGHNESSMAP\n\tuniform sampler2D roughnessMap;\n#endif";

var shadowmap_pars_fragment = "#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D directionalShadowMap[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tvarying vec4 vDirectionalShadowCoord[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tstruct DirectionalLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform DirectionalLightShadow directionalLightShadows[ NUM_DIR_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D spotShadowMap[ NUM_SPOT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vSpotShadowCoord[ NUM_SPOT_LIGHT_SHADOWS ];\n\t\tstruct SpotLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform SpotLightShadow spotLightShadows[ NUM_SPOT_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D pointShadowMap[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vPointShadowCoord[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tstruct PointLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t\tfloat shadowCameraNear;\n\t\t\tfloat shadowCameraFar;\n\t\t};\n\t\tuniform PointLightShadow pointLightShadows[ NUM_POINT_LIGHT_SHADOWS ];\n\t#endif\n\tfloat texture2DCompare( sampler2D depths, vec2 uv, float compare ) {\n\t\treturn step( compare, unpackRGBAToDepth( texture2D( depths, uv ) ) );\n\t}\n\tvec2 texture2DDistribution( sampler2D shadow, vec2 uv ) {\n\t\treturn unpackRGBATo2Half( texture2D( shadow, uv ) );\n\t}\n\tfloat VSMShadow (sampler2D shadow, vec2 uv, float compare ){\n\t\tfloat occlusion = 1.0;\n\t\tvec2 distribution = texture2DDistribution( shadow, uv );\n\t\tfloat hard_shadow = step( compare , distribution.x );\n\t\tif (hard_shadow != 1.0 ) {\n\t\t\tfloat distance = compare - distribution.x ;\n\t\t\tfloat variance = max( 0.00000, distribution.y * distribution.y );\n\t\t\tfloat softness_probability = variance / (variance + distance * distance );\t\t\tsoftness_probability = clamp( ( softness_probability - 0.3 ) / ( 0.95 - 0.3 ), 0.0, 1.0 );\t\t\tocclusion = clamp( max( hard_shadow, softness_probability ), 0.0, 1.0 );\n\t\t}\n\t\treturn occlusion;\n\t}\n\tfloat getShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord ) {\n\t\tfloat shadow = 1.0;\n\t\tshadowCoord.xyz /= shadowCoord.w;\n\t\tshadowCoord.z += shadowBias;\n\t\tbvec4 inFrustumVec = bvec4 ( shadowCoord.x >= 0.0, shadowCoord.x <= 1.0, shadowCoord.y >= 0.0, shadowCoord.y <= 1.0 );\n\t\tbool inFrustum = all( inFrustumVec );\n\t\tbvec2 frustumTestVec = bvec2( inFrustum, shadowCoord.z <= 1.0 );\n\t\tbool frustumTest = all( frustumTestVec );\n\t\tif ( frustumTest ) {\n\t\t#if defined( SHADOWMAP_TYPE_PCF )\n\t\t\tvec2 texelSize = vec2( 1.0 ) / shadowMapSize;\n\t\t\tfloat dx0 = - texelSize.x * shadowRadius;\n\t\t\tfloat dy0 = - texelSize.y * shadowRadius;\n\t\t\tfloat dx1 = + texelSize.x * shadowRadius;\n\t\t\tfloat dy1 = + texelSize.y * shadowRadius;\n\t\t\tfloat dx2 = dx0 / 2.0;\n\t\t\tfloat dy2 = dy0 / 2.0;\n\t\t\tfloat dx3 = dx1 / 2.0;\n\t\t\tfloat dy3 = dy1 / 2.0;\n\t\t\tshadow = (\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy1 ), shadowCoord.z )\n\t\t\t) * ( 1.0 / 17.0 );\n\t\t#elif defined( SHADOWMAP_TYPE_PCF_SOFT )\n\t\t\tvec2 texelSize = vec2( 1.0 ) / shadowMapSize;\n\t\t\tfloat dx = texelSize.x;\n\t\t\tfloat dy = texelSize.y;\n\t\t\tvec2 uv = shadowCoord.xy;\n\t\t\tvec2 f = fract( uv * shadowMapSize + 0.5 );\n\t\t\tuv -= f * texelSize;\n\t\t\tshadow = (\n\t\t\t\ttexture2DCompare( shadowMap, uv, shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + vec2( dx, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + vec2( 0.0, dy ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + texelSize, shadowCoord.z ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( -dx, 0.0 ), shadowCoord.z ), \n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, 0.0 ), shadowCoord.z ),\n\t\t\t\t\t f.x ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( -dx, dy ), shadowCoord.z ), \n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, dy ), shadowCoord.z ),\n\t\t\t\t\t f.x ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( 0.0, -dy ), shadowCoord.z ), \n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 0.0, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t f.y ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( dx, -dy ), shadowCoord.z ), \n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( dx, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t f.y ) +\n\t\t\t\tmix( mix( texture2DCompare( shadowMap, uv + vec2( -dx, -dy ), shadowCoord.z ), \n\t\t\t\t\t\t  texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, -dy ), shadowCoord.z ),\n\t\t\t\t\t\t  f.x ),\n\t\t\t\t\t mix( texture2DCompare( shadowMap, uv + vec2( -dx, 2.0 * dy ), shadowCoord.z ), \n\t\t\t\t\t\t  texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t\t  f.x ),\n\t\t\t\t\t f.y )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#elif defined( SHADOWMAP_TYPE_VSM )\n\t\t\tshadow = VSMShadow( shadowMap, shadowCoord.xy, shadowCoord.z );\n\t\t#else\n\t\t\tshadow = texture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z );\n\t\t#endif\n\t\t}\n\t\treturn shadow;\n\t}\n\tvec2 cubeToUV( vec3 v, float texelSizeY ) {\n\t\tvec3 absV = abs( v );\n\t\tfloat scaleToCube = 1.0 / max( absV.x, max( absV.y, absV.z ) );\n\t\tabsV *= scaleToCube;\n\t\tv *= scaleToCube * ( 1.0 - 2.0 * texelSizeY );\n\t\tvec2 planar = v.xy;\n\t\tfloat almostATexel = 1.5 * texelSizeY;\n\t\tfloat almostOne = 1.0 - almostATexel;\n\t\tif ( absV.z >= almostOne ) {\n\t\t\tif ( v.z > 0.0 )\n\t\t\t\tplanar.x = 4.0 - v.x;\n\t\t} else if ( absV.x >= almostOne ) {\n\t\t\tfloat signX = sign( v.x );\n\t\t\tplanar.x = v.z * signX + 2.0 * signX;\n\t\t} else if ( absV.y >= almostOne ) {\n\t\t\tfloat signY = sign( v.y );\n\t\t\tplanar.x = v.x + 2.0 * signY + 2.0;\n\t\t\tplanar.y = v.z * signY - 2.0;\n\t\t}\n\t\treturn vec2( 0.125, 0.25 ) * planar + vec2( 0.375, 0.75 );\n\t}\n\tfloat getPointShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord, float shadowCameraNear, float shadowCameraFar ) {\n\t\tvec2 texelSize = vec2( 1.0 ) / ( shadowMapSize * vec2( 4.0, 2.0 ) );\n\t\tvec3 lightToPosition = shadowCoord.xyz;\n\t\tfloat dp = ( length( lightToPosition ) - shadowCameraNear ) / ( shadowCameraFar - shadowCameraNear );\t\tdp += shadowBias;\n\t\tvec3 bd3D = normalize( lightToPosition );\n\t\t#if defined( SHADOWMAP_TYPE_PCF ) || defined( SHADOWMAP_TYPE_PCF_SOFT ) || defined( SHADOWMAP_TYPE_VSM )\n\t\t\tvec2 offset = vec2( - 1, 1 ) * shadowRadius * texelSize.y;\n\t\t\treturn (\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxx, texelSize.y ), dp )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#else\n\t\t\treturn texture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp );\n\t\t#endif\n\t}\n#endif";

var shadowmap_pars_vertex = "#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t\tuniform mat4 directionalShadowMatrix[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tvarying vec4 vDirectionalShadowCoord[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tstruct DirectionalLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform DirectionalLightShadow directionalLightShadows[ NUM_DIR_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\t\tuniform mat4 spotShadowMatrix[ NUM_SPOT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vSpotShadowCoord[ NUM_SPOT_LIGHT_SHADOWS ];\n\t\tstruct SpotLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform SpotLightShadow spotLightShadows[ NUM_SPOT_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t\tuniform mat4 pointShadowMatrix[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vPointShadowCoord[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tstruct PointLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t\tfloat shadowCameraNear;\n\t\t\tfloat shadowCameraFar;\n\t\t};\n\t\tuniform PointLightShadow pointLightShadows[ NUM_POINT_LIGHT_SHADOWS ];\n\t#endif\n#endif";

var shadowmap_vertex = "#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0 || NUM_SPOT_LIGHT_SHADOWS > 0 || NUM_POINT_LIGHT_SHADOWS > 0\n\t\tvec3 shadowWorldNormal = inverseTransformDirection( transformedNormal, viewMatrix );\n\t\tvec4 shadowWorldPosition;\n\t#endif\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_DIR_LIGHT_SHADOWS; i ++ ) {\n\t\tshadowWorldPosition = worldPosition + vec4( shadowWorldNormal * directionalLightShadows[ i ].shadowNormalBias, 0 );\n\t\tvDirectionalShadowCoord[ i ] = directionalShadowMatrix[ i ] * shadowWorldPosition;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_SPOT_LIGHT_SHADOWS; i ++ ) {\n\t\tshadowWorldPosition = worldPosition + vec4( shadowWorldNormal * spotLightShadows[ i ].shadowNormalBias, 0 );\n\t\tvSpotShadowCoord[ i ] = spotShadowMatrix[ i ] * shadowWorldPosition;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_POINT_LIGHT_SHADOWS; i ++ ) {\n\t\tshadowWorldPosition = worldPosition + vec4( shadowWorldNormal * pointLightShadows[ i ].shadowNormalBias, 0 );\n\t\tvPointShadowCoord[ i ] = pointShadowMatrix[ i ] * shadowWorldPosition;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n#endif";

var shadowmask_pars_fragment = "float getShadowMask() {\n\tfloat shadow = 1.0;\n\t#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\tDirectionalLightShadow directionalLight;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_DIR_LIGHT_SHADOWS; i ++ ) {\n\t\tdirectionalLight = directionalLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getShadow( directionalShadowMap[ i ], directionalLight.shadowMapSize, directionalLight.shadowBias, directionalLight.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\tSpotLightShadow spotLight;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_SPOT_LIGHT_SHADOWS; i ++ ) {\n\t\tspotLight = spotLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getShadow( spotShadowMap[ i ], spotLight.shadowMapSize, spotLight.shadowBias, spotLight.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\tPointLightShadow pointLight;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_POINT_LIGHT_SHADOWS; i ++ ) {\n\t\tpointLight = pointLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getPointShadow( pointShadowMap[ i ], pointLight.shadowMapSize, pointLight.shadowBias, pointLight.shadowRadius, vPointShadowCoord[ i ], pointLight.shadowCameraNear, pointLight.shadowCameraFar ) : 1.0;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n\t#endif\n\treturn shadow;\n}";

var skinbase_vertex = "#ifdef USE_SKINNING\n\tmat4 boneMatX = getBoneMatrix( skinIndex.x );\n\tmat4 boneMatY = getBoneMatrix( skinIndex.y );\n\tmat4 boneMatZ = getBoneMatrix( skinIndex.z );\n\tmat4 boneMatW = getBoneMatrix( skinIndex.w );\n#endif";

var skinning_pars_vertex = "#ifdef USE_SKINNING\n\tuniform mat4 bindMatrix;\n\tuniform mat4 bindMatrixInverse;\n\t#ifdef BONE_TEXTURE\n\t\tuniform highp sampler2D boneTexture;\n\t\tuniform int boneTextureSize;\n\t\tmat4 getBoneMatrix( const in float i ) {\n\t\t\tfloat j = i * 4.0;\n\t\t\tfloat x = mod( j, float( boneTextureSize ) );\n\t\t\tfloat y = floor( j / float( boneTextureSize ) );\n\t\t\tfloat dx = 1.0 / float( boneTextureSize );\n\t\t\tfloat dy = 1.0 / float( boneTextureSize );\n\t\t\ty = dy * ( y + 0.5 );\n\t\t\tvec4 v1 = texture2D( boneTexture, vec2( dx * ( x + 0.5 ), y ) );\n\t\t\tvec4 v2 = texture2D( boneTexture, vec2( dx * ( x + 1.5 ), y ) );\n\t\t\tvec4 v3 = texture2D( boneTexture, vec2( dx * ( x + 2.5 ), y ) );\n\t\t\tvec4 v4 = texture2D( boneTexture, vec2( dx * ( x + 3.5 ), y ) );\n\t\t\tmat4 bone = mat4( v1, v2, v3, v4 );\n\t\t\treturn bone;\n\t\t}\n\t#else\n\t\tuniform mat4 boneMatrices[ MAX_BONES ];\n\t\tmat4 getBoneMatrix( const in float i ) {\n\t\t\tmat4 bone = boneMatrices[ int(i) ];\n\t\t\treturn bone;\n\t\t}\n\t#endif\n#endif";

var skinning_vertex = "#ifdef USE_SKINNING\n\tvec4 skinVertex = bindMatrix * vec4( transformed, 1.0 );\n\tvec4 skinned = vec4( 0.0 );\n\tskinned += boneMatX * skinVertex * skinWeight.x;\n\tskinned += boneMatY * skinVertex * skinWeight.y;\n\tskinned += boneMatZ * skinVertex * skinWeight.z;\n\tskinned += boneMatW * skinVertex * skinWeight.w;\n\ttransformed = ( bindMatrixInverse * skinned ).xyz;\n#endif";

var skinnormal_vertex = "#ifdef USE_SKINNING\n\tmat4 skinMatrix = mat4( 0.0 );\n\tskinMatrix += skinWeight.x * boneMatX;\n\tskinMatrix += skinWeight.y * boneMatY;\n\tskinMatrix += skinWeight.z * boneMatZ;\n\tskinMatrix += skinWeight.w * boneMatW;\n\tskinMatrix = bindMatrixInverse * skinMatrix * bindMatrix;\n\tobjectNormal = vec4( skinMatrix * vec4( objectNormal, 0.0 ) ).xyz;\n\t#ifdef USE_TANGENT\n\t\tobjectTangent = vec4( skinMatrix * vec4( objectTangent, 0.0 ) ).xyz;\n\t#endif\n#endif";

var specularmap_fragment = "float specularStrength;\n#ifdef USE_SPECULARMAP\n\tvec4 texelSpecular = texture2D( specularMap, vUv );\n\tspecularStrength = texelSpecular.r;\n#else\n\tspecularStrength = 1.0;\n#endif";

var specularmap_pars_fragment = "#ifdef USE_SPECULARMAP\n\tuniform sampler2D specularMap;\n#endif";

var tonemapping_fragment = "#if defined( TONE_MAPPING )\n\tgl_FragColor.rgb = toneMapping( gl_FragColor.rgb );\n#endif";

var tonemapping_pars_fragment = "#ifndef saturate\n#define saturate(a) clamp( a, 0.0, 1.0 )\n#endif\nuniform float toneMappingExposure;\nvec3 LinearToneMapping( vec3 color ) {\n\treturn toneMappingExposure * color;\n}\nvec3 ReinhardToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\treturn saturate( color / ( vec3( 1.0 ) + color ) );\n}\nvec3 OptimizedCineonToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\tcolor = max( vec3( 0.0 ), color - 0.004 );\n\treturn pow( ( color * ( 6.2 * color + 0.5 ) ) / ( color * ( 6.2 * color + 1.7 ) + 0.06 ), vec3( 2.2 ) );\n}\nvec3 RRTAndODTFit( vec3 v ) {\n\tvec3 a = v * ( v + 0.0245786 ) - 0.000090537;\n\tvec3 b = v * ( 0.983729 * v + 0.4329510 ) + 0.238081;\n\treturn a / b;\n}\nvec3 ACESFilmicToneMapping( vec3 color ) {\n\tconst mat3 ACESInputMat = mat3(\n\t\tvec3( 0.59719, 0.07600, 0.02840 ),\t\tvec3( 0.35458, 0.90834, 0.13383 ),\n\t\tvec3( 0.04823, 0.01566, 0.83777 )\n\t);\n\tconst mat3 ACESOutputMat = mat3(\n\t\tvec3(  1.60475, -0.10208, -0.00327 ),\t\tvec3( -0.53108,  1.10813, -0.07276 ),\n\t\tvec3( -0.07367, -0.00605,  1.07602 )\n\t);\n\tcolor *= toneMappingExposure / 0.6;\n\tcolor = ACESInputMat * color;\n\tcolor = RRTAndODTFit( color );\n\tcolor = ACESOutputMat * color;\n\treturn saturate( color );\n}\nvec3 CustomToneMapping( vec3 color ) { return color; }";

var transmissionmap_fragment = "#ifdef USE_TRANSMISSIONMAP\n\ttotalTransmission *= texture2D( transmissionMap, vUv ).r;\n#endif";

var transmissionmap_pars_fragment = "#ifdef USE_TRANSMISSIONMAP\n\tuniform sampler2D transmissionMap;\n#endif";

var uv_pars_fragment = "#if ( defined( USE_UV ) && ! defined( UVS_VERTEX_ONLY ) )\n\tvarying vec2 vUv;\n#endif";

var uv_pars_vertex = "#ifdef USE_UV\n\t#ifdef UVS_VERTEX_ONLY\n\t\tvec2 vUv;\n\t#else\n\t\tvarying vec2 vUv;\n\t#endif\n\tuniform mat3 uvTransform;\n#endif";

var uv_vertex = "#ifdef USE_UV\n\tvUv = ( uvTransform * vec3( uv, 1 ) ).xy;\n#endif";

var uv2_pars_fragment = "#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tvarying vec2 vUv2;\n#endif";

var uv2_pars_vertex = "#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tattribute vec2 uv2;\n\tvarying vec2 vUv2;\n\tuniform mat3 uv2Transform;\n#endif";

var uv2_vertex = "#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tvUv2 = ( uv2Transform * vec3( uv2, 1 ) ).xy;\n#endif";

var worldpos_vertex = "#if defined( USE_ENVMAP ) || defined( DISTANCE ) || defined ( USE_SHADOWMAP )\n\tvec4 worldPosition = vec4( transformed, 1.0 );\n\t#ifdef USE_INSTANCING\n\t\tworldPosition = instanceMatrix * worldPosition;\n\t#endif\n\tworldPosition = modelMatrix * worldPosition;\n#endif";

var background_frag = "uniform sampler2D t2D;\nvarying vec2 vUv;\nvoid main() {\n\tvec4 texColor = texture2D( t2D, vUv );\n\tgl_FragColor = mapTexelToLinear( texColor );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n}";

var background_vert = "varying vec2 vUv;\nuniform mat3 uvTransform;\nvoid main() {\n\tvUv = ( uvTransform * vec3( uv, 1 ) ).xy;\n\tgl_Position = vec4( position.xy, 1.0, 1.0 );\n}";

var cube_frag = "#include <envmap_common_pars_fragment>\nuniform float opacity;\nvarying vec3 vWorldDirection;\n#include <cube_uv_reflection_fragment>\nvoid main() {\n\tvec3 vReflect = vWorldDirection;\n\t#include <envmap_fragment>\n\tgl_FragColor = envColor;\n\tgl_FragColor.a *= opacity;\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n}";

var cube_vert = "varying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvWorldDirection = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n\tgl_Position.z = gl_Position.w;\n}";

var depth_frag = "#if DEPTH_PACKING == 3200\n\tuniform float opacity;\n#endif\n#include <common>\n#include <packing>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvarying vec2 vHighPrecisionZW;\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( 1.0 );\n\t#if DEPTH_PACKING == 3200\n\t\tdiffuseColor.a = opacity;\n\t#endif\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <logdepthbuf_fragment>\n\tfloat fragCoordZ = 0.5 * vHighPrecisionZW[0] / vHighPrecisionZW[1] + 0.5;\n\t#if DEPTH_PACKING == 3200\n\t\tgl_FragColor = vec4( vec3( 1.0 - fragCoordZ ), opacity );\n\t#elif DEPTH_PACKING == 3201\n\t\tgl_FragColor = packDepthToRGBA( fragCoordZ );\n\t#endif\n}";

var depth_vert = "#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvarying vec2 vHighPrecisionZW;\nvoid main() {\n\t#include <uv_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_DISPLACEMENTMAP\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvHighPrecisionZW = gl_Position.zw;\n}";

var distanceRGBA_frag = "#define DISTANCE\nuniform vec3 referencePosition;\nuniform float nearDistance;\nuniform float farDistance;\nvarying vec3 vWorldPosition;\n#include <common>\n#include <packing>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main () {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( 1.0 );\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\tfloat dist = length( vWorldPosition - referencePosition );\n\tdist = ( dist - nearDistance ) / ( farDistance - nearDistance );\n\tdist = saturate( dist );\n\tgl_FragColor = packDepthToRGBA( dist );\n}";

var distanceRGBA_vert = "#define DISTANCE\nvarying vec3 vWorldPosition;\n#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_DISPLACEMENTMAP\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <worldpos_vertex>\n\t#include <clipping_planes_vertex>\n\tvWorldPosition = worldPosition.xyz;\n}";

var equirect_frag = "uniform sampler2D tEquirect;\nvarying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvec3 direction = normalize( vWorldDirection );\n\tvec2 sampleUV = equirectUv( direction );\n\tvec4 texColor = texture2D( tEquirect, sampleUV );\n\tgl_FragColor = mapTexelToLinear( texColor );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n}";

var equirect_vert = "varying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvWorldDirection = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n}";

var linedashed_frag = "uniform vec3 diffuse;\nuniform float opacity;\nuniform float dashSize;\nuniform float totalSize;\nvarying float vLineDistance;\n#include <common>\n#include <color_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tif ( mod( vLineDistance, totalSize ) > dashSize ) {\n\t\tdiscard;\n\t}\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <color_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n}";

var linedashed_vert = "uniform float scale;\nattribute float lineDistance;\nvarying float vLineDistance;\n#include <common>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\tvLineDistance = scale * lineDistance;\n\t#include <color_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n}";

var meshbasic_frag = "uniform vec3 diffuse;\nuniform float opacity;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <cube_uv_reflection_fragment>\n#include <fog_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <specularmap_fragment>\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\t#ifdef USE_LIGHTMAP\n\t\n\t\tvec4 lightMapTexel= texture2D( lightMap, vUv2 );\n\t\treflectedLight.indirectDiffuse += lightMapTexelToLinear( lightMapTexel ).rgb * lightMapIntensity;\n\t#else\n\t\treflectedLight.indirectDiffuse += vec3( 1.0 );\n\t#endif\n\t#include <aomap_fragment>\n\treflectedLight.indirectDiffuse *= diffuseColor.rgb;\n\tvec3 outgoingLight = reflectedLight.indirectDiffuse;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

var meshbasic_vert = "#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_ENVMAP\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <worldpos_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <envmap_vertex>\n\t#include <fog_vertex>\n}";

var meshlambert_frag = "uniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float opacity;\nvarying vec3 vLightFront;\nvarying vec3 vIndirectFront;\n#ifdef DOUBLE_SIDED\n\tvarying vec3 vLightBack;\n\tvarying vec3 vIndirectBack;\n#endif\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <cube_uv_reflection_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <fog_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <shadowmask_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <specularmap_fragment>\n\t#include <emissivemap_fragment>\n\t#ifdef DOUBLE_SIDED\n\t\treflectedLight.indirectDiffuse += ( gl_FrontFacing ) ? vIndirectFront : vIndirectBack;\n\t#else\n\t\treflectedLight.indirectDiffuse += vIndirectFront;\n\t#endif\n\t#include <lightmap_fragment>\n\treflectedLight.indirectDiffuse *= BRDF_Diffuse_Lambert( diffuseColor.rgb );\n\t#ifdef DOUBLE_SIDED\n\t\treflectedLight.directDiffuse = ( gl_FrontFacing ) ? vLightFront : vLightBack;\n\t#else\n\t\treflectedLight.directDiffuse = vLightFront;\n\t#endif\n\treflectedLight.directDiffuse *= BRDF_Diffuse_Lambert( diffuseColor.rgb ) * getShadowMask();\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + totalEmissiveRadiance;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

var meshlambert_vert = "#define LAMBERT\nvarying vec3 vLightFront;\nvarying vec3 vIndirectFront;\n#ifdef DOUBLE_SIDED\n\tvarying vec3 vLightBack;\n\tvarying vec3 vIndirectBack;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <envmap_pars_vertex>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <lights_lambert_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

var meshmatcap_frag = "#define MATCAP\nuniform vec3 diffuse;\nuniform float opacity;\nuniform sampler2D matcap;\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\tvec3 viewDir = normalize( vViewPosition );\n\tvec3 x = normalize( vec3( viewDir.z, 0.0, - viewDir.x ) );\n\tvec3 y = cross( viewDir, x );\n\tvec2 uv = vec2( dot( x, normal ), dot( y, normal ) ) * 0.495 + 0.5;\n\t#ifdef USE_MATCAP\n\t\tvec4 matcapColor = texture2D( matcap, uv );\n\t\tmatcapColor = matcapTexelToLinear( matcapColor );\n\t#else\n\t\tvec4 matcapColor = vec4( 1.0 );\n\t#endif\n\tvec3 outgoingLight = diffuseColor.rgb * matcapColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

var meshmatcap_vert = "#define MATCAP\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <color_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#ifndef FLAT_SHADED\n\t\tvNormal = normalize( transformedNormal );\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n\tvViewPosition = - mvPosition.xyz;\n}";

var meshtoon_frag = "#define TOON\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <gradientmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <lights_toon_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_toon_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + totalEmissiveRadiance;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

var meshtoon_vert = "#define TOON\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

var meshphong_frag = "#define PHONG\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform vec3 specular;\nuniform float shininess;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <cube_uv_reflection_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <lights_phong_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <specularmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_phong_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

var meshphong_vert = "#define PHONG\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

var meshphysical_frag = "#define STANDARD\n#ifdef PHYSICAL\n\t#define REFLECTIVITY\n\t#define CLEARCOAT\n\t#define TRANSMISSION\n#endif\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float roughness;\nuniform float metalness;\nuniform float opacity;\n#ifdef TRANSMISSION\n\tuniform float transmission;\n#endif\n#ifdef REFLECTIVITY\n\tuniform float reflectivity;\n#endif\n#ifdef CLEARCOAT\n\tuniform float clearcoat;\n\tuniform float clearcoatRoughness;\n#endif\n#ifdef USE_SHEEN\n\tuniform vec3 sheen;\n#endif\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <transmissionmap_pars_fragment>\n#include <bsdfs>\n#include <cube_uv_reflection_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_physical_pars_fragment>\n#include <fog_pars_fragment>\n#include <lights_pars_begin>\n#include <lights_physical_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <clearcoat_pars_fragment>\n#include <roughnessmap_pars_fragment>\n#include <metalnessmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#ifdef TRANSMISSION\n\t\tfloat totalTransmission = transmission;\n\t#endif\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <roughnessmap_fragment>\n\t#include <metalnessmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <clearcoat_normal_fragment_begin>\n\t#include <clearcoat_normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <transmissionmap_fragment>\n\t#include <lights_physical_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;\n\t#ifdef TRANSMISSION\n\t\tdiffuseColor.a *= mix( saturate( 1. - totalTransmission + linearToRelativeLuminance( reflectedLight.directSpecular + reflectedLight.indirectSpecular ) ), 1.0, metalness );\n\t#endif\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

var meshphysical_vert = "#define STANDARD\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n\t#ifdef USE_TANGENT\n\t\tvTangent = normalize( transformedTangent );\n\t\tvBitangent = normalize( cross( vNormal, vTangent ) * tangent.w );\n\t#endif\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

var normal_frag = "#define NORMAL\nuniform float opacity;\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( TANGENTSPACE_NORMALMAP )\n\tvarying vec3 vViewPosition;\n#endif\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif\n#include <packing>\n#include <uv_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\t#include <logdepthbuf_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\tgl_FragColor = vec4( packNormalToRGB( normal ), opacity );\n}";

var normal_vert = "#define NORMAL\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( TANGENTSPACE_NORMALMAP )\n\tvarying vec3 vViewPosition;\n#endif\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n\t#ifdef USE_TANGENT\n\t\tvTangent = normalize( transformedTangent );\n\t\tvBitangent = normalize( cross( vNormal, vTangent ) * tangent.w );\n\t#endif\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( TANGENTSPACE_NORMALMAP )\n\tvViewPosition = - mvPosition.xyz;\n#endif\n}";

var points_frag = "uniform vec3 diffuse;\nuniform float opacity;\n#include <common>\n#include <color_pars_fragment>\n#include <map_particle_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_particle_fragment>\n\t#include <color_fragment>\n\t#include <alphatest_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n}";

var points_vert = "uniform float size;\nuniform float scale;\n#include <common>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <color_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <project_vertex>\n\tgl_PointSize = size;\n\t#ifdef USE_SIZEATTENUATION\n\t\tbool isPerspective = isPerspectiveMatrix( projectionMatrix );\n\t\tif ( isPerspective ) gl_PointSize *= ( scale / - mvPosition.z );\n\t#endif\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <worldpos_vertex>\n\t#include <fog_vertex>\n}";

var shadow_frag = "uniform vec3 color;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <shadowmap_pars_fragment>\n#include <shadowmask_pars_fragment>\nvoid main() {\n\tgl_FragColor = vec4( color, opacity * ( 1.0 - getShadowMask() ) );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n}";

var shadow_vert = "#include <common>\n#include <fog_pars_vertex>\n#include <shadowmap_pars_vertex>\nvoid main() {\n\t#include <begin_vertex>\n\t#include <project_vertex>\n\t#include <worldpos_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

var sprite_frag = "uniform vec3 diffuse;\nuniform float opacity;\n#include <common>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n}";

var sprite_vert = "uniform float rotation;\nuniform vec2 center;\n#include <common>\n#include <uv_pars_vertex>\n#include <fog_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\tvec4 mvPosition = modelViewMatrix * vec4( 0.0, 0.0, 0.0, 1.0 );\n\tvec2 scale;\n\tscale.x = length( vec3( modelMatrix[ 0 ].x, modelMatrix[ 0 ].y, modelMatrix[ 0 ].z ) );\n\tscale.y = length( vec3( modelMatrix[ 1 ].x, modelMatrix[ 1 ].y, modelMatrix[ 1 ].z ) );\n\t#ifndef USE_SIZEATTENUATION\n\t\tbool isPerspective = isPerspectiveMatrix( projectionMatrix );\n\t\tif ( isPerspective ) scale *= - mvPosition.z;\n\t#endif\n\tvec2 alignedPosition = ( position.xy - ( center - vec2( 0.5 ) ) ) * scale;\n\tvec2 rotatedPosition;\n\trotatedPosition.x = cos( rotation ) * alignedPosition.x - sin( rotation ) * alignedPosition.y;\n\trotatedPosition.y = sin( rotation ) * alignedPosition.x + cos( rotation ) * alignedPosition.y;\n\tmvPosition.xy += rotatedPosition;\n\tgl_Position = projectionMatrix * mvPosition;\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n}";

const ShaderChunk = {
        alphamap_fragment: alphamap_fragment,
        alphamap_pars_fragment: alphamap_pars_fragment,
        alphatest_fragment: alphatest_fragment,
        aomap_fragment: aomap_fragment,
        aomap_pars_fragment: aomap_pars_fragment,
        begin_vertex: begin_vertex,
        beginnormal_vertex: beginnormal_vertex,
        bsdfs: bsdfs,
        bumpmap_pars_fragment: bumpmap_pars_fragment,
        clipping_planes_fragment: clipping_planes_fragment,
        clipping_planes_pars_fragment: clipping_planes_pars_fragment,
        clipping_planes_pars_vertex: clipping_planes_pars_vertex,
        clipping_planes_vertex: clipping_planes_vertex,
        color_fragment: color_fragment,
        color_pars_fragment: color_pars_fragment,
        color_pars_vertex: color_pars_vertex,
        color_vertex: color_vertex,
        common: common,
        cube_uv_reflection_fragment: cube_uv_reflection_fragment,
        defaultnormal_vertex: defaultnormal_vertex,
        displacementmap_pars_vertex: displacementmap_pars_vertex,
        displacementmap_vertex: displacementmap_vertex,
        emissivemap_fragment: emissivemap_fragment,
        emissivemap_pars_fragment: emissivemap_pars_fragment,
        encodings_fragment: encodings_fragment,
        encodings_pars_fragment: encodings_pars_fragment,
        envmap_fragment: envmap_fragment,
        envmap_common_pars_fragment: envmap_common_pars_fragment,
        envmap_pars_fragment: envmap_pars_fragment,
        envmap_pars_vertex: envmap_pars_vertex,
        envmap_physical_pars_fragment: envmap_physical_pars_fragment,
        envmap_vertex: envmap_vertex,
        fog_vertex: fog_vertex,
        fog_pars_vertex: fog_pars_vertex,
        fog_fragment: fog_fragment,
        fog_pars_fragment: fog_pars_fragment,
        gradientmap_pars_fragment: gradientmap_pars_fragment,
        lightmap_fragment: lightmap_fragment,
        lightmap_pars_fragment: lightmap_pars_fragment,
        lights_lambert_vertex: lights_lambert_vertex,
        lights_pars_begin: lights_pars_begin,
        lights_toon_fragment: lights_toon_fragment,
        lights_toon_pars_fragment: lights_toon_pars_fragment,
        lights_phong_fragment: lights_phong_fragment,
        lights_phong_pars_fragment: lights_phong_pars_fragment,
        lights_physical_fragment: lights_physical_fragment,
        lights_physical_pars_fragment: lights_physical_pars_fragment,
        lights_fragment_begin: lights_fragment_begin,
        lights_fragment_maps: lights_fragment_maps,
        lights_fragment_end: lights_fragment_end,
        logdepthbuf_fragment: logdepthbuf_fragment,
        logdepthbuf_pars_fragment: logdepthbuf_pars_fragment,
        logdepthbuf_pars_vertex: logdepthbuf_pars_vertex,
        logdepthbuf_vertex: logdepthbuf_vertex,
        map_fragment: map_fragment,
        map_pars_fragment: map_pars_fragment,
        map_particle_fragment: map_particle_fragment,
        map_particle_pars_fragment: map_particle_pars_fragment,
        metalnessmap_fragment: metalnessmap_fragment,
        metalnessmap_pars_fragment: metalnessmap_pars_fragment,
        morphnormal_vertex: morphnormal_vertex,
        morphtarget_pars_vertex: morphtarget_pars_vertex,
        morphtarget_vertex: morphtarget_vertex,
        normal_fragment_begin: normal_fragment_begin,
        normal_fragment_maps: normal_fragment_maps,
        normalmap_pars_fragment: normalmap_pars_fragment,
        clearcoat_normal_fragment_begin: clearcoat_normal_fragment_begin,
        clearcoat_normal_fragment_maps: clearcoat_normal_fragment_maps,
        clearcoat_pars_fragment: clearcoat_pars_fragment,
        packing: packing,
        premultiplied_alpha_fragment: premultiplied_alpha_fragment,
        project_vertex: project_vertex,
        dithering_fragment: dithering_fragment,
        dithering_pars_fragment: dithering_pars_fragment,
        roughnessmap_fragment: roughnessmap_fragment,
        roughnessmap_pars_fragment: roughnessmap_pars_fragment,
        shadowmap_pars_fragment: shadowmap_pars_fragment,
        shadowmap_pars_vertex: shadowmap_pars_vertex,
        shadowmap_vertex: shadowmap_vertex,
        shadowmask_pars_fragment: shadowmask_pars_fragment,
        skinbase_vertex: skinbase_vertex,
        skinning_pars_vertex: skinning_pars_vertex,
        skinning_vertex: skinning_vertex,
        skinnormal_vertex: skinnormal_vertex,
        specularmap_fragment: specularmap_fragment,
        specularmap_pars_fragment: specularmap_pars_fragment,
        tonemapping_fragment: tonemapping_fragment,
        tonemapping_pars_fragment: tonemapping_pars_fragment,
        transmissionmap_fragment: transmissionmap_fragment,
        transmissionmap_pars_fragment: transmissionmap_pars_fragment,
        uv_pars_fragment: uv_pars_fragment,
        uv_pars_vertex: uv_pars_vertex,
        uv_vertex: uv_vertex,
        uv2_pars_fragment: uv2_pars_fragment,
        uv2_pars_vertex: uv2_pars_vertex,
        uv2_vertex: uv2_vertex,
        worldpos_vertex: worldpos_vertex,

        background_frag: background_frag,
        background_vert: background_vert,
        cube_frag: cube_frag,
        cube_vert: cube_vert,
        depth_frag: depth_frag,
        depth_vert: depth_vert,
        distanceRGBA_frag: distanceRGBA_frag,
        distanceRGBA_vert: distanceRGBA_vert,
        equirect_frag: equirect_frag,
        equirect_vert: equirect_vert,
        linedashed_frag: linedashed_frag,
        linedashed_vert: linedashed_vert,
        meshbasic_frag: meshbasic_frag,
        meshbasic_vert: meshbasic_vert,
        meshlambert_frag: meshlambert_frag,
        meshlambert_vert: meshlambert_vert,
        meshmatcap_frag: meshmatcap_frag,
        meshmatcap_vert: meshmatcap_vert,
        meshtoon_frag: meshtoon_frag,
        meshtoon_vert: meshtoon_vert,
        meshphong_frag: meshphong_frag,
        meshphong_vert: meshphong_vert,
        meshphysical_frag: meshphysical_frag,
        meshphysical_vert: meshphysical_vert,
        normal_frag: normal_frag,
        normal_vert: normal_vert,
        points_frag: points_frag,
        points_vert: points_vert,
        shadow_frag: shadow_frag,
        shadow_vert: shadow_vert,
        sprite_frag: sprite_frag,
        sprite_vert: sprite_vert
};

/**
 * Uniforms library for shared webgl shaders
 */

const UniformsLib = {

        common: {

                diffuse: { value: new Color( 0xeeeeee ) },
                opacity: { value: 1.0 },

                map: { value: null },
                uvTransform: { value: new Matrix3() },
                uv2Transform: { value: new Matrix3() },

                alphaMap: { value: null },

        },

        specularmap: {

                specularMap: { value: null },

        },

        envmap: {

                envMap: { value: null },
                flipEnvMap: { value: - 1 },
                reflectivity: { value: 1.0 },
                refractionRatio: { value: 0.98 },
                maxMipLevel: { value: 0 }

        },

        aomap: {

                aoMap: { value: null },
                aoMapIntensity: { value: 1 }

        },

        lightmap: {

                lightMap: { value: null },
                lightMapIntensity: { value: 1 }

        },

        emissivemap: {

                emissiveMap: { value: null }

        },

        bumpmap: {

                bumpMap: { value: null },
                bumpScale: { value: 1 }

        },

        normalmap: {

                normalMap: { value: null },
                normalScale: { value: new Vector2( 1, 1 ) }

        },

        displacementmap: {

                displacementMap: { value: null },
                displacementScale: { value: 1 },
                displacementBias: { value: 0 }

        },

        roughnessmap: {

                roughnessMap: { value: null }

        },

        metalnessmap: {

                metalnessMap: { value: null }

        },

        gradientmap: {

                gradientMap: { value: null }

        },

        fog: {

                fogDensity: { value: 0.00025 },
                fogNear: { value: 1 },
                fogFar: { value: 2000 },
                fogColor: { value: new Color( 0xffffff ) }

        },

        lights: {

                ambientLightColor: { value: [] },

                lightProbe: { value: [] },

                directionalLights: { value: [], properties: {
                        direction: {},
                        color: {}
                } },

                directionalLightShadows: { value: [], properties: {
                        shadowBias: {},
                        shadowNormalBias: {},
                        shadowRadius: {},
                        shadowMapSize: {}
                } },

                directionalShadowMap: { value: [] },
                directionalShadowMatrix: { value: [] },

                spotLights: { value: [], properties: {
                        color: {},
                        position: {},
                        direction: {},
                        distance: {},
                        coneCos: {},
                        penumbraCos: {},
                        decay: {}
                } },

                spotLightShadows: { value: [], properties: {
                        shadowBias: {},
                        shadowNormalBias: {},
                        shadowRadius: {},
                        shadowMapSize: {}
                } },

                spotShadowMap: { value: [] },
                spotShadowMatrix: { value: [] },

                pointLights: { value: [], properties: {
                        color: {},
                        position: {},
                        decay: {},
                        distance: {}
                } },

                pointLightShadows: { value: [], properties: {
                        shadowBias: {},
                        shadowNormalBias: {},
                        shadowRadius: {},
                        shadowMapSize: {},
                        shadowCameraNear: {},
                        shadowCameraFar: {}
                } },

                pointShadowMap: { value: [] },
                pointShadowMatrix: { value: [] },

                hemisphereLights: { value: [], properties: {
                        direction: {},
                        skyColor: {},
                        groundColor: {}
                } },

                // TODO (abelnation): RectAreaLight BRDF data needs to be moved from example to main src
                rectAreaLights: { value: [], properties: {
                        color: {},
                        position: {},
                        width: {},
                        height: {}
                } },

                ltc_1: { value: null },
                ltc_2: { value: null }

        },

        points: {

                diffuse: { value: new Color( 0xeeeeee ) },
                opacity: { value: 1.0 },
                size: { value: 1.0 },
                scale: { value: 1.0 },
                map: { value: null },
                alphaMap: { value: null },
                uvTransform: { value: new Matrix3() }

        },

        sprite: {

                diffuse: { value: new Color( 0xeeeeee ) },
                opacity: { value: 1.0 },
                center: { value: new Vector2( 0.5, 0.5 ) },
                rotation: { value: 0.0 },
                map: { value: null },
                alphaMap: { value: null },
                uvTransform: { value: new Matrix3() }

        }

};

const ShaderLib = {

        basic: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.specularmap,
                        UniformsLib.envmap,
                        UniformsLib.aomap,
                        UniformsLib.lightmap,
                        UniformsLib.fog
                ] ),

                vertexShader: ShaderChunk.meshbasic_vert,
                fragmentShader: ShaderChunk.meshbasic_frag

        },

        lambert: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.specularmap,
                        UniformsLib.envmap,
                        UniformsLib.aomap,
                        UniformsLib.lightmap,
                        UniformsLib.emissivemap,
                        UniformsLib.fog,
                        UniformsLib.lights,
                        {
                                emissive: { value: new Color( 0x000000 ) }
                        }
                ] ),

                vertexShader: ShaderChunk.meshlambert_vert,
                fragmentShader: ShaderChunk.meshlambert_frag

        },

        phong: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.specularmap,
                        UniformsLib.envmap,
                        UniformsLib.aomap,
                        UniformsLib.lightmap,
                        UniformsLib.emissivemap,
                        UniformsLib.bumpmap,
                        UniformsLib.normalmap,
                        UniformsLib.displacementmap,
                        UniformsLib.fog,
                        UniformsLib.lights,
                        {
                                emissive: { value: new Color( 0x000000 ) },
                                specular: { value: new Color( 0x111111 ) },
                                shininess: { value: 30 }
                        }
                ] ),

                vertexShader: ShaderChunk.meshphong_vert,
                fragmentShader: ShaderChunk.meshphong_frag

        },

        standard: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.envmap,
                        UniformsLib.aomap,
                        UniformsLib.lightmap,
                        UniformsLib.emissivemap,
                        UniformsLib.bumpmap,
                        UniformsLib.normalmap,
                        UniformsLib.displacementmap,
                        UniformsLib.roughnessmap,
                        UniformsLib.metalnessmap,
                        UniformsLib.fog,
                        UniformsLib.lights,
                        {
                                emissive: { value: new Color( 0x000000 ) },
                                roughness: { value: 1.0 },
                                metalness: { value: 0.0 },
                                envMapIntensity: { value: 1 } // temporary
                        }
                ] ),

                vertexShader: ShaderChunk.meshphysical_vert,
                fragmentShader: ShaderChunk.meshphysical_frag

        },

        toon: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.aomap,
                        UniformsLib.lightmap,
                        UniformsLib.emissivemap,
                        UniformsLib.bumpmap,
                        UniformsLib.normalmap,
                        UniformsLib.displacementmap,
                        UniformsLib.gradientmap,
                        UniformsLib.fog,
                        UniformsLib.lights,
                        {
                                emissive: { value: new Color( 0x000000 ) }
                        }
                ] ),

                vertexShader: ShaderChunk.meshtoon_vert,
                fragmentShader: ShaderChunk.meshtoon_frag

        },

        matcap: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.bumpmap,
                        UniformsLib.normalmap,
                        UniformsLib.displacementmap,
                        UniformsLib.fog,
                        {
                                matcap: { value: null }
                        }
                ] ),

                vertexShader: ShaderChunk.meshmatcap_vert,
                fragmentShader: ShaderChunk.meshmatcap_frag

        },

        points: {

                uniforms: mergeUniforms( [
                        UniformsLib.points,
                        UniformsLib.fog
                ] ),

                vertexShader: ShaderChunk.points_vert,
                fragmentShader: ShaderChunk.points_frag

        },

        dashed: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.fog,
                        {
                                scale: { value: 1 },
                                dashSize: { value: 1 },
                                totalSize: { value: 2 }
                        }
                ] ),

                vertexShader: ShaderChunk.linedashed_vert,
                fragmentShader: ShaderChunk.linedashed_frag

        },

        depth: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.displacementmap
                ] ),

                vertexShader: ShaderChunk.depth_vert,
                fragmentShader: ShaderChunk.depth_frag

        },

        normal: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.bumpmap,
                        UniformsLib.normalmap,
                        UniformsLib.displacementmap,
                        {
                                opacity: { value: 1.0 }
                        }
                ] ),

                vertexShader: ShaderChunk.normal_vert,
                fragmentShader: ShaderChunk.normal_frag

        },

        sprite: {

                uniforms: mergeUniforms( [
                        UniformsLib.sprite,
                        UniformsLib.fog
                ] ),

                vertexShader: ShaderChunk.sprite_vert,
                fragmentShader: ShaderChunk.sprite_frag

        },

        background: {

                uniforms: {
                        uvTransform: { value: new Matrix3() },
                        t2D: { value: null },
                },

                vertexShader: ShaderChunk.background_vert,
                fragmentShader: ShaderChunk.background_frag

        },
        /* -------------------------------------------------------------------------
        //      Cube map shader
         ------------------------------------------------------------------------- */

        cube: {

                uniforms: mergeUniforms( [
                        UniformsLib.envmap,
                        {
                                opacity: { value: 1.0 }
                        }
                ] ),

                vertexShader: ShaderChunk.cube_vert,
                fragmentShader: ShaderChunk.cube_frag

        },

        equirect: {

                uniforms: {
                        tEquirect: { value: null },
                },

                vertexShader: ShaderChunk.equirect_vert,
                fragmentShader: ShaderChunk.equirect_frag

        },

        distanceRGBA: {

                uniforms: mergeUniforms( [
                        UniformsLib.common,
                        UniformsLib.displacementmap,
                        {
                                referencePosition: { value: new Vector3() },
                                nearDistance: { value: 1 },
                                farDistance: { value: 1000 }
                        }
                ] ),

                vertexShader: ShaderChunk.distanceRGBA_vert,
                fragmentShader: ShaderChunk.distanceRGBA_frag

        },

        shadow: {

                uniforms: mergeUniforms( [
                        UniformsLib.lights,
                        UniformsLib.fog,
                        {
                                color: { value: new Color( 0x00000 ) },
                                opacity: { value: 1.0 }
                        },
                ] ),

                vertexShader: ShaderChunk.shadow_vert,
                fragmentShader: ShaderChunk.shadow_frag

        }

};

ShaderLib.physical = {

        uniforms: mergeUniforms( [
                ShaderLib.standard.uniforms,
                {
                        clearcoat: { value: 0 },
                        clearcoatMap: { value: null },
                        clearcoatRoughness: { value: 0 },
                        clearcoatRoughnessMap: { value: null },
                        clearcoatNormalScale: { value: new Vector2( 1, 1 ) },
                        clearcoatNormalMap: { value: null },
                        sheen: { value: new Color( 0x000000 ) },
                        transmission: { value: 0 },
                        transmissionMap: { value: null },
                }
        ] ),

        vertexShader: ShaderChunk.meshphysical_vert,
        fragmentShader: ShaderChunk.meshphysical_frag

};

function WebGLBackground( renderer, cubemaps, state, objects, premultipliedAlpha ) {

        const clearColor = new Color( 0x000000 );
        let clearAlpha = 0;

        let planeMesh;
        let boxMesh;

        let currentBackground = null;
        let currentBackgroundVersion = 0;
        let currentTonemapping = null;

        function render( renderList, scene, camera, forceClear ) {

                let background = scene.isScene === true ? scene.background : null;

                if ( background && background.isTexture ) {

                        background = cubemaps.get( background );

                }

                // Ignore background in AR
                // TODO: Reconsider this.

                const xr = renderer.xr;
                const session = xr.getSession && xr.getSession();

                if ( session && session.environmentBlendMode === 'additive' ) {

                        background = null;

                }

                if ( background === null ) {

                        setClear( clearColor, clearAlpha );

                } else if ( background && background.isColor ) {

                        setClear( background, 1 );
                        forceClear = true;

                }

                if ( renderer.autoClear || forceClear ) {

                        renderer.clear( renderer.autoClearColor, renderer.autoClearDepth, renderer.autoClearStencil );

                }

                if ( background && ( background.isCubeTexture || background.isWebGLCubeRenderTarget || background.mapping === CubeUVReflectionMapping ) ) {

                        if ( boxMesh === undefined ) {

                                boxMesh = new Mesh(
                                        new BoxBufferGeometry( 1, 1, 1 ),
                                        new ShaderMaterial( {
                                                name: 'BackgroundCubeMaterial',
                                                uniforms: cloneUniforms( ShaderLib.cube.uniforms ),
                                                vertexShader: ShaderLib.cube.vertexShader,
                                                fragmentShader: ShaderLib.cube.fragmentShader,
                                                side: BackSide,
                                                depthTest: false,
                                                depthWrite: false,
                                                fog: false
                                        } )
                                );

                                boxMesh.geometry.deleteAttribute( 'normal' );
                                boxMesh.geometry.deleteAttribute( 'uv' );

                                boxMesh.onBeforeRender = function ( renderer, scene, camera ) {

                                        this.matrixWorld.copyPosition( camera.matrixWorld );

                                };

                                // enable code injection for non-built-in material
                                Object.defineProperty( boxMesh.material, 'envMap', {

                                        get: function () {

                                                return this.uniforms.envMap.value;

                                        }

                                } );

                                objects.update( boxMesh );

                        }

                        if ( background.isWebGLCubeRenderTarget ) {

                                // TODO Deprecate

                                background = background.texture;

                        }

                        boxMesh.material.uniforms.envMap.value = background;
                        boxMesh.material.uniforms.flipEnvMap.value = ( background.isCubeTexture && background._needsFlipEnvMap ) ? - 1 : 1;

                        if ( currentBackground !== background ||
                                currentBackgroundVersion !== background.version ||
                                currentTonemapping !== renderer.toneMapping ) {

                                boxMesh.material.needsUpdate = true;

                                currentBackground = background;
                                currentBackgroundVersion = background.version;
                                currentTonemapping = renderer.toneMapping;

                        }

                        // push to the pre-sorted opaque render list
                        renderList.unshift( boxMesh, boxMesh.geometry, boxMesh.material, 0, 0, null );

                } else if ( background && background.isTexture ) {

                        if ( planeMesh === undefined ) {

                                planeMesh = new Mesh(
                                        new PlaneBufferGeometry( 2, 2 ),
                                        new ShaderMaterial( {
                                                name: 'BackgroundMaterial',
                                                uniforms: cloneUniforms( ShaderLib.background.uniforms ),
                                                vertexShader: ShaderLib.background.vertexShader,
                                                fragmentShader: ShaderLib.background.fragmentShader,
                                                side: FrontSide,
                                                depthTest: false,
                                                depthWrite: false,
                                                fog: false
                                        } )
                                );

                                planeMesh.geometry.deleteAttribute( 'normal' );

                                // enable code injection for non-built-in material
                                Object.defineProperty( planeMesh.material, 'map', {

                                        get: function () {

                                                return this.uniforms.t2D.value;

                                        }

                                } );

                                objects.update( planeMesh );

                        }

                        planeMesh.material.uniforms.t2D.value = background;

                        if ( background.matrixAutoUpdate === true ) {

                                background.updateMatrix();

                        }

                        planeMesh.material.uniforms.uvTransform.value.copy( background.matrix );

                        if ( currentBackground !== background ||
                                currentBackgroundVersion !== background.version ||
                                currentTonemapping !== renderer.toneMapping ) {

                                planeMesh.material.needsUpdate = true;

                                currentBackground = background;
                                currentBackgroundVersion = background.version;
                                currentTonemapping = renderer.toneMapping;

                        }


                        // push to the pre-sorted opaque render list
                        renderList.unshift( planeMesh, planeMesh.geometry, planeMesh.material, 0, 0, null );

                }

        }

        function setClear( color, alpha ) {

                state.buffers.color.setClear( color.r, color.g, color.b, alpha, premultipliedAlpha );

        }

        return {

                getClearColor: function () {

                        return clearColor;

                },
                setClearColor: function ( color, alpha = 1 ) {

                        clearColor.set( color );
                        clearAlpha = alpha;
                        setClear( clearColor, clearAlpha );

                },
                getClearAlpha: function () {

                        return clearAlpha;

                },
                setClearAlpha: function ( alpha ) {

                        clearAlpha = alpha;
                        setClear( clearColor, clearAlpha );

                },
                render: render

        };

}

function WebGLBindingStates( gl, extensions, attributes, capabilities ) {

        const maxVertexAttributes = gl.getParameter( 34921 );

        const extension = capabilities.isWebGL2 ? null : extensions.get( 'OES_vertex_array_object' );
        const vaoAvailable = capabilities.isWebGL2 || extension !== null;

        const bindingStates = {};

        const defaultState = createBindingState( null );
        let currentState = defaultState;

        function setup( object, material, program, geometry, index ) {

                let updateBuffers = false;

                if ( vaoAvailable ) {

                        const state = getBindingState( geometry, program, material );

                        if ( currentState !== state ) {

                                currentState = state;
                                bindVertexArrayObject( currentState.object );

                        }

                        updateBuffers = needsUpdate( geometry, index );

                        if ( updateBuffers ) saveCache( geometry, index );

                } else {

                        const wireframe = ( material.wireframe === true );

                        if ( currentState.geometry !== geometry.id ||
                                currentState.program !== program.id ||
                                currentState.wireframe !== wireframe ) {

                                currentState.geometry = geometry.id;
                                currentState.program = program.id;
                                currentState.wireframe = wireframe;

                                updateBuffers = true;

                        }

                }

                if ( object.isInstancedMesh === true ) {

                        updateBuffers = true;

                }

                if ( index !== null ) {

                        attributes.update( index, 34963 );

                }

                if ( updateBuffers ) {

                        setupVertexAttributes( object, material, program, geometry );

                        if ( index !== null ) {

                                gl.bindBuffer( 34963, attributes.get( index ).buffer );

                        }

                }

        }

        function createVertexArrayObject() {

                if ( capabilities.isWebGL2 ) return gl.createVertexArray();

                return extension.createVertexArrayOES();

        }

        function bindVertexArrayObject( vao ) {

                if ( capabilities.isWebGL2 ) return gl.bindVertexArray( vao );

                return extension.bindVertexArrayOES( vao );

        }

        function deleteVertexArrayObject( vao ) {

                if ( capabilities.isWebGL2 ) return gl.deleteVertexArray( vao );

                return extension.deleteVertexArrayOES( vao );

        }

        function getBindingState( geometry, program, material ) {

                const wireframe = ( material.wireframe === true );

                let programMap = bindingStates[ geometry.id ];

                if ( programMap === undefined ) {

                        programMap = {};
                        bindingStates[ geometry.id ] = programMap;

                }

                let stateMap = programMap[ program.id ];

                if ( stateMap === undefined ) {

                        stateMap = {};
                        programMap[ program.id ] = stateMap;

                }

                let state = stateMap[ wireframe ];

                if ( state === undefined ) {

                        state = createBindingState( createVertexArrayObject() );
                        stateMap[ wireframe ] = state;

                }

                return state;

        }

        function createBindingState( vao ) {

                const newAttributes = [];
                const enabledAttributes = [];
                const attributeDivisors = [];

                for ( let i = 0; i < maxVertexAttributes; i ++ ) {

                        newAttributes[ i ] = 0;
                        enabledAttributes[ i ] = 0;
                        attributeDivisors[ i ] = 0;

                }

                return {

                        // for backward compatibility on non-VAO support browser
                        geometry: null,
                        program: null,
                        wireframe: false,

                        newAttributes: newAttributes,
                        enabledAttributes: enabledAttributes,
                        attributeDivisors: attributeDivisors,
                        object: vao,
                        attributes: {},
                        index: null

                };

        }

        function needsUpdate( geometry, index ) {

                const cachedAttributes = currentState.attributes;
                const geometryAttributes = geometry.attributes;

                let attributesNum = 0;

                for ( const key in geometryAttributes ) {

                        const cachedAttribute = cachedAttributes[ key ];
                        const geometryAttribute = geometryAttributes[ key ];

                        if ( cachedAttribute === undefined ) return true;

                        if ( cachedAttribute.attribute !== geometryAttribute ) return true;

                        if ( cachedAttribute.data !== geometryAttribute.data ) return true;

                        attributesNum ++;

                }

                if ( currentState.attributesNum !== attributesNum ) return true;

                if ( currentState.index !== index ) return true;

                return false;

        }

        function saveCache( geometry, index ) {

                const cache = {};
                const attributes = geometry.attributes;
                let attributesNum = 0;

                for ( const key in attributes ) {

                        const attribute = attributes[ key ];

                        const data = {};
                        data.attribute = attribute;

                        if ( attribute.data ) {

                                data.data = attribute.data;

                        }

                        cache[ key ] = data;

                        attributesNum ++;

                }

                currentState.attributes = cache;
                currentState.attributesNum = attributesNum;

                currentState.index = index;

        }

        function initAttributes() {

                const newAttributes = currentState.newAttributes;

                for ( let i = 0, il = newAttributes.length; i < il; i ++ ) {

                        newAttributes[ i ] = 0;

                }

        }

        function enableAttribute( attribute ) {

                enableAttributeAndDivisor( attribute, 0 );

        }

        function enableAttributeAndDivisor( attribute, meshPerAttribute ) {

                const newAttributes = currentState.newAttributes;
                const enabledAttributes = currentState.enabledAttributes;
                const attributeDivisors = currentState.attributeDivisors;

                newAttributes[ attribute ] = 1;

                if ( enabledAttributes[ attribute ] === 0 ) {

                        gl.enableVertexAttribArray( attribute );
                        enabledAttributes[ attribute ] = 1;

                }

                if ( attributeDivisors[ attribute ] !== meshPerAttribute ) {

                        const extension = capabilities.isWebGL2 ? gl : extensions.get( 'ANGLE_instanced_arrays' );

                        extension[ capabilities.isWebGL2 ? 'vertexAttribDivisor' : 'vertexAttribDivisorANGLE' ]( attribute, meshPerAttribute );
                        attributeDivisors[ attribute ] = meshPerAttribute;

                }

        }

        function disableUnusedAttributes() {

                const newAttributes = currentState.newAttributes;
                const enabledAttributes = currentState.enabledAttributes;

                for ( let i = 0, il = enabledAttributes.length; i < il; i ++ ) {

                        if ( enabledAttributes[ i ] !== newAttributes[ i ] ) {

                                gl.disableVertexAttribArray( i );
                                enabledAttributes[ i ] = 0;

                        }

                }

        }

        function vertexAttribPointer( index, size, type, normalized, stride, offset ) {

                if ( capabilities.isWebGL2 === true && ( type === 5124 || type === 5125 ) ) {

                        gl.vertexAttribIPointer( index, size, type, stride, offset );

                } else {

                        gl.vertexAttribPointer( index, size, type, normalized, stride, offset );

                }

        }

        function setupVertexAttributes( object, material, program, geometry ) {

                if ( capabilities.isWebGL2 === false && ( object.isInstancedMesh || geometry.isInstancedBufferGeometry ) ) {

                        if ( extensions.get( 'ANGLE_instanced_arrays' ) === null ) return;

                }

                initAttributes();

                const geometryAttributes = geometry.attributes;

                const programAttributes = program.getAttributes();

                const materialDefaultAttributeValues = material.defaultAttributeValues;

                for ( const name in programAttributes ) {

                        const programAttribute = programAttributes[ name ];

                        if ( programAttribute >= 0 ) {

                                const geometryAttribute = geometryAttributes[ name ];

                                if ( geometryAttribute !== undefined ) {

                                        const normalized = geometryAttribute.normalized;
                                        const size = geometryAttribute.itemSize;

                                        const attribute = attributes.get( geometryAttribute );

                                        // TODO Attribute may not be available on context restore

                                        if ( attribute === undefined ) continue;

                                        const buffer = attribute.buffer;
                                        const type = attribute.type;
                                        const bytesPerElement = attribute.bytesPerElement;

                                        if ( geometryAttribute.isInterleavedBufferAttribute ) {

                                                const data = geometryAttribute.data;
                                                const stride = data.stride;
                                                const offset = geometryAttribute.offset;

                                                if ( data && data.isInstancedInterleavedBuffer ) {

                                                        enableAttributeAndDivisor( programAttribute, data.meshPerAttribute );

                                                        if ( geometry._maxInstanceCount === undefined ) {

                                                                geometry._maxInstanceCount = data.meshPerAttribute * data.count;

                                                        }

                                                } else {

                                                        enableAttribute( programAttribute );

                                                }

                                                gl.bindBuffer( 34962, buffer );
                                                vertexAttribPointer( programAttribute, size, type, normalized, stride * bytesPerElement, offset * bytesPerElement );

                                        } else {

                                                if ( geometryAttribute.isInstancedBufferAttribute ) {

                                                        enableAttributeAndDivisor( programAttribute, geometryAttribute.meshPerAttribute );

                                                        if ( geometry._maxInstanceCount === undefined ) {

                                                                geometry._maxInstanceCount = geometryAttribute.meshPerAttribute * geometryAttribute.count;

                                                        }

                                                } else {

                                                        enableAttribute( programAttribute );

                                                }

                                                gl.bindBuffer( 34962, buffer );
                                                vertexAttribPointer( programAttribute, size, type, normalized, 0, 0 );

                                        }

                                } else if ( name === 'instanceMatrix' ) {

                                        const attribute = attributes.get( object.instanceMatrix );

                                        // TODO Attribute may not be available on context restore

                                        if ( attribute === undefined ) continue;

                                        const buffer = attribute.buffer;
                                        const type = attribute.type;

                                        enableAttributeAndDivisor( programAttribute + 0, 1 );
                                        enableAttributeAndDivisor( programAttribute + 1, 1 );
                                        enableAttributeAndDivisor( programAttribute + 2, 1 );
                                        enableAttributeAndDivisor( programAttribute + 3, 1 );

                                        gl.bindBuffer( 34962, buffer );

                                        gl.vertexAttribPointer( programAttribute + 0, 4, type, false, 64, 0 );
                                        gl.vertexAttribPointer( programAttribute + 1, 4, type, false, 64, 16 );
                                        gl.vertexAttribPointer( programAttribute + 2, 4, type, false, 64, 32 );
                                        gl.vertexAttribPointer( programAttribute + 3, 4, type, false, 64, 48 );

                                } else if ( name === 'instanceColor' ) {

                                        const attribute = attributes.get( object.instanceColor );

                                        // TODO Attribute may not be available on context restore

                                        if ( attribute === undefined ) continue;

                                        const buffer = attribute.buffer;
                                        const type = attribute.type;

                                        enableAttributeAndDivisor( programAttribute, 1 );

                                        gl.bindBuffer( 34962, buffer );

                                        gl.vertexAttribPointer( programAttribute, 3, type, false, 12, 0 );

                                } else if ( materialDefaultAttributeValues !== undefined ) {

                                        const value = materialDefaultAttributeValues[ name ];

                                        if ( value !== undefined ) {

                                                switch ( value.length ) {

                                                        case 2:
                                                                gl.vertexAttrib2fv( programAttribute, value );
                                                                break;

                                                        case 3:
                                                                gl.vertexAttrib3fv( programAttribute, value );
                                                                break;

                                                        case 4:
                                                                gl.vertexAttrib4fv( programAttribute, value );
                                                                break;

                                                        default:
                                                                gl.vertexAttrib1fv( programAttribute, value );

                                                }

                                        }

                                }

                        }

                }

                disableUnusedAttributes();

        }

        function dispose() {

                reset();

                for ( const geometryId in bindingStates ) {

                        const programMap = bindingStates[ geometryId ];

                        for ( const programId in programMap ) {

                                const stateMap = programMap[ programId ];

                                for ( const wireframe in stateMap ) {

                                        deleteVertexArrayObject( stateMap[ wireframe ].object );

                                        delete stateMap[ wireframe ];

                                }

                                delete programMap[ programId ];

                        }

                        delete bindingStates[ geometryId ];

                }

        }

        function releaseStatesOfGeometry( geometry ) {

                if ( bindingStates[ geometry.id ] === undefined ) return;

                const programMap = bindingStates[ geometry.id ];

                for ( const programId in programMap ) {

                        const stateMap = programMap[ programId ];

                        for ( const wireframe in stateMap ) {

                                deleteVertexArrayObject( stateMap[ wireframe ].object );

                                delete stateMap[ wireframe ];

                        }

                        delete programMap[ programId ];

                }

                delete bindingStates[ geometry.id ];

        }

        function releaseStatesOfProgram( program ) {

                for ( const geometryId in bindingStates ) {

                        const programMap = bindingStates[ geometryId ];

                        if ( programMap[ program.id ] === undefined ) continue;

                        const stateMap = programMap[ program.id ];

                        for ( const wireframe in stateMap ) {

                                deleteVertexArrayObject( stateMap[ wireframe ].object );

                                delete stateMap[ wireframe ];

                        }

                        delete programMap[ program.id ];

                }

        }

        function reset() {

                resetDefaultState();

                if ( currentState === defaultState ) return;

                currentState = defaultState;
                bindVertexArrayObject( currentState.object );

        }

        // for backward-compatilibity

        function resetDefaultState() {

                defaultState.geometry = null;
                defaultState.program = null;
                defaultState.wireframe = false;

        }

        return {

                setup: setup,
                reset: reset,
                resetDefaultState: resetDefaultState,
                dispose: dispose,
                releaseStatesOfGeometry: releaseStatesOfGeometry,
                releaseStatesOfProgram: releaseStatesOfProgram,

                initAttributes: initAttributes,
                enableAttribute: enableAttribute,
                disableUnusedAttributes: disableUnusedAttributes

        };

}

function WebGLBufferRenderer( gl, extensions, info, capabilities ) {

        const isWebGL2 = capabilities.isWebGL2;

        let mode;

        function setMode( value ) {

                mode = value;

        }

        function render( start, count ) {

                gl.drawArrays( mode, start, count );

                info.update( count, mode, 1 );

        }

        function renderInstances( start, count, primcount ) {

                if ( primcount === 0 ) return;

                let extension, methodName;

                if ( isWebGL2 ) {

                        extension = gl;
                        methodName = 'drawArraysInstanced';

                } else {

                        extension = extensions.get( 'ANGLE_instanced_arrays' );
                        methodName = 'drawArraysInstancedANGLE';

                        if ( extension === null ) {

                                console.error( 'THREE.WebGLBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' );
                                return;

                        }

                }

                extension[ methodName ]( mode, start, count, primcount );

                info.update( count, mode, primcount );

        }

        //

        this.setMode = setMode;
        this.render = render;
        this.renderInstances = renderInstances;

}

function WebGLCapabilities( gl, extensions, parameters ) {

        let maxAnisotropy;

        function getMaxAnisotropy() {

                if ( maxAnisotropy !== undefined ) return maxAnisotropy;

                const extension = extensions.get( 'EXT_texture_filter_anisotropic' );

                if ( extension !== null ) {

                        maxAnisotropy = gl.getParameter( extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT );

                } else {

                        maxAnisotropy = 0;

                }

                return maxAnisotropy;

        }

        function getMaxPrecision( precision ) {

                if ( precision === 'highp' ) {

                        if ( gl.getShaderPrecisionFormat( 35633, 36338 ).precision > 0 &&
                                gl.getShaderPrecisionFormat( 35632, 36338 ).precision > 0 ) {

                                return 'highp';

                        }

                        precision = 'mediump';

                }

                if ( precision === 'mediump' ) {

                        if ( gl.getShaderPrecisionFormat( 35633, 36337 ).precision > 0 &&
                                gl.getShaderPrecisionFormat( 35632, 36337 ).precision > 0 ) {

                                return 'mediump';

                        }

                }

                return 'lowp';

        }

        /* eslint-disable no-undef */
        const isWebGL2 = ( typeof WebGL2RenderingContext !== 'undefined' && gl instanceof WebGL2RenderingContext ) ||
                ( typeof WebGL2ComputeRenderingContext !== 'undefined' && gl instanceof WebGL2ComputeRenderingContext );
        /* eslint-enable no-undef */

        let precision = parameters.precision !== undefined ? parameters.precision : 'highp';
        const maxPrecision = getMaxPrecision( precision );

        if ( maxPrecision !== precision ) {

                console.warn( 'THREE.WebGLRenderer:', precision, 'not supported, using', maxPrecision, 'instead.' );
                precision = maxPrecision;

        }

        const logarithmicDepthBuffer = parameters.logarithmicDepthBuffer === true;

        const maxTextures = gl.getParameter( 34930 );
        const maxVertexTextures = gl.getParameter( 35660 );
        const maxTextureSize = gl.getParameter( 3379 );
        const maxCubemapSize = gl.getParameter( 34076 );

        const maxAttributes = gl.getParameter( 34921 );
        const maxVertexUniforms = gl.getParameter( 36347 );
        const maxVaryings = gl.getParameter( 36348 );
        const maxFragmentUniforms = gl.getParameter( 36349 );

        const vertexTextures = maxVertexTextures > 0;
        const floatFragmentTextures = isWebGL2 || !! extensions.get( 'OES_texture_float' );
        const floatVertexTextures = vertexTextures && floatFragmentTextures;

        const maxSamples = isWebGL2 ? gl.getParameter( 36183 ) : 0;

        return {

                isWebGL2: isWebGL2,

                getMaxAnisotropy: getMaxAnisotropy,
                getMaxPrecision: getMaxPrecision,

                precision: precision,
                logarithmicDepthBuffer: logarithmicDepthBuffer,

                maxTextures: maxTextures,
                maxVertexTextures: maxVertexTextures,
                maxTextureSize: maxTextureSize,
                maxCubemapSize: maxCubemapSize,

                maxAttributes: maxAttributes,
                maxVertexUniforms: maxVertexUniforms,
                maxVaryings: maxVaryings,
                maxFragmentUniforms: maxFragmentUniforms,

                vertexTextures: vertexTextures,
                floatFragmentTextures: floatFragmentTextures,
                floatVertexTextures: floatVertexTextures,

                maxSamples: maxSamples

        };

}

function WebGLClipping( properties ) {

        const scope = this;

        let globalState = null,
                numGlobalPlanes = 0,
                localClippingEnabled = false,
                renderingShadows = false;

        const plane = new Plane(),
                viewNormalMatrix = new Matrix3(),

                uniform = { value: null, needsUpdate: false };

        this.uniform = uniform;
        this.numPlanes = 0;
        this.numIntersection = 0;

        this.init = function ( planes, enableLocalClipping, camera ) {

                const enabled =
                        planes.length !== 0 ||
                        enableLocalClipping ||
                        // enable state of previous frame - the clipping code has to
                        // run another frame in order to reset the state:
                        numGlobalPlanes !== 0 ||
                        localClippingEnabled;

                localClippingEnabled = enableLocalClipping;

                globalState = projectPlanes( planes, camera, 0 );
                numGlobalPlanes = planes.length;

                return enabled;

        };

        this.beginShadows = function () {

                renderingShadows = true;
                projectPlanes( null );

        };

        this.endShadows = function () {

                renderingShadows = false;
                resetGlobalState();

        };

        this.setState = function ( material, camera, useCache ) {

                const planes = material.clippingPlanes,
                        clipIntersection = material.clipIntersection,
                        clipShadows = material.clipShadows;

                const materialProperties = properties.get( material );

                if ( ! localClippingEnabled || planes === null || planes.length === 0 || renderingShadows && ! clipShadows ) {

                        // there's no local clipping

                        if ( renderingShadows ) {

                                // there's no global clipping

                                projectPlanes( null );

                        } else {

                                resetGlobalState();

                        }

                } else {

                        const nGlobal = renderingShadows ? 0 : numGlobalPlanes,
                                lGlobal = nGlobal * 4;

                        let dstArray = materialProperties.clippingState || null;

                        uniform.value = dstArray; // ensure unique state

                        dstArray = projectPlanes( planes, camera, lGlobal, useCache );

                        for ( let i = 0; i !== lGlobal; ++ i ) {

                                dstArray[ i ] = globalState[ i ];

                        }

                        materialProperties.clippingState = dstArray;
                        this.numIntersection = clipIntersection ? this.numPlanes : 0;
                        this.numPlanes += nGlobal;

                }


        };

        function resetGlobalState() {

                if ( uniform.value !== globalState ) {

                        uniform.value = globalState;
                        uniform.needsUpdate = numGlobalPlanes > 0;

                }

                scope.numPlanes = numGlobalPlanes;
                scope.numIntersection = 0;

        }

        function projectPlanes( planes, camera, dstOffset, skipTransform ) {

                const nPlanes = planes !== null ? planes.length : 0;
                let dstArray = null;

                if ( nPlanes !== 0 ) {

                        dstArray = uniform.value;

                        if ( skipTransform !== true || dstArray === null ) {

                                const flatSize = dstOffset + nPlanes * 4,
                                        viewMatrix = camera.matrixWorldInverse;

                                viewNormalMatrix.getNormalMatrix( viewMatrix );

                                if ( dstArray === null || dstArray.length < flatSize ) {

                                        dstArray = new Float32Array( flatSize );

                                }

                                for ( let i = 0, i4 = dstOffset; i !== nPlanes; ++ i, i4 += 4 ) {

                                        plane.copy( planes[ i ] ).applyMatrix4( viewMatrix, viewNormalMatrix );

                                        plane.normal.toArray( dstArray, i4 );
                                        dstArray[ i4 + 3 ] = plane.constant;

                                }

                        }

                        uniform.value = dstArray;
                        uniform.needsUpdate = true;

                }

                scope.numPlanes = nPlanes;
                scope.numIntersection = 0;

                return dstArray;

        }

}

function WebGLCubeMaps( renderer ) {

        let cubemaps = new WeakMap();

        function mapTextureMapping( texture, mapping ) {

                if ( mapping === EquirectangularReflectionMapping ) {

                        texture.mapping = CubeReflectionMapping;

                } else if ( mapping === EquirectangularRefractionMapping ) {

                        texture.mapping = CubeRefractionMapping;

                }

                return texture;

        }

        function get( texture ) {

                if ( texture && texture.isTexture ) {

                        const mapping = texture.mapping;

                        if ( mapping === EquirectangularReflectionMapping || mapping === EquirectangularRefractionMapping ) {

                                if ( cubemaps.has( texture ) ) {

                                        const cubemap = cubemaps.get( texture ).texture;
                                        return mapTextureMapping( cubemap, texture.mapping );

                                } else {

                                        const image = texture.image;

                                        if ( image && image.height > 0 ) {

                                                const currentRenderList = renderer.getRenderList();
                                                const currentRenderTarget = renderer.getRenderTarget();
                                                const currentRenderState = renderer.getRenderState();

                                                const renderTarget = new WebGLCubeRenderTarget( image.height / 2 );
                                                renderTarget.fromEquirectangularTexture( renderer, texture );
                                                cubemaps.set( texture, renderTarget );

                                                renderer.setRenderTarget( currentRenderTarget );
                                                renderer.setRenderList( currentRenderList );
                                                renderer.setRenderState( currentRenderState );

                                                texture.addEventListener( 'dispose', onTextureDispose );

                                                return mapTextureMapping( renderTarget.texture, texture.mapping );

                                        } else {

                                                // image not yet ready. try the conversion next frame

                                                return null;

                                        }

                                }

                        }

                }

                return texture;

        }

        function onTextureDispose( event ) {

                const texture = event.target;

                texture.removeEventListener( 'dispose', onTextureDispose );

                const cubemap = cubemaps.get( texture );

                if ( cubemap !== undefined ) {

                        cubemaps.delete( texture );
                        cubemap.dispose();

                }

        }

        function dispose() {

                cubemaps = new WeakMap();

        }

        return {
                get: get,
                dispose: dispose
        };

}

function WebGLExtensions( gl ) {

        const extensions = {};

        return {

                has: function ( name ) {

                        if ( extensions[ name ] !== undefined ) {

                                return extensions[ name ] !== null;

                        }

                        let extension;

                        switch ( name ) {

                                case 'WEBGL_depth_texture':
                                        extension = gl.getExtension( 'WEBGL_depth_texture' ) || gl.getExtension( 'MOZ_WEBGL_depth_texture' ) || gl.getExtension( 'WEBKIT_WEBGL_depth_texture' );
                                        break;

                                case 'EXT_texture_filter_anisotropic':
                                        extension = gl.getExtension( 'EXT_texture_filter_anisotropic' ) || gl.getExtension( 'MOZ_EXT_texture_filter_anisotropic' ) || gl.getExtension( 'WEBKIT_EXT_texture_filter_anisotropic' );
                                        break;

                                case 'WEBGL_compressed_texture_s3tc':
                                        extension = gl.getExtension( 'WEBGL_compressed_texture_s3tc' ) || gl.getExtension( 'MOZ_WEBGL_compressed_texture_s3tc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_s3tc' );
                                        break;

                                case 'WEBGL_compressed_texture_pvrtc':
                                        extension = gl.getExtension( 'WEBGL_compressed_texture_pvrtc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_pvrtc' );
                                        break;

                                default:
                                        extension = gl.getExtension( name );

                        }

                        extensions[ name ] = extension;

                        return extension !== null;

                },

                get: function ( name ) {

                        if ( ! this.has( name ) ) {

                                console.warn( 'THREE.WebGLRenderer: ' + name + ' extension not supported.' );

                        }

                        return extensions[ name ];

                }

        };

}

function WebGLGeometries( gl, attributes, info, bindingStates ) {

        const geometries = new WeakMap();
        const wireframeAttributes = new WeakMap();

        function onGeometryDispose( event ) {

                const geometry = event.target;
                const buffergeometry = geometries.get( geometry );

                if ( buffergeometry.index !== null ) {

                        attributes.remove( buffergeometry.index );

                }

                for ( const name in buffergeometry.attributes ) {

                        attributes.remove( buffergeometry.attributes[ name ] );

                }

                geometry.removeEventListener( 'dispose', onGeometryDispose );

                geometries.delete( geometry );

                const attribute = wireframeAttributes.get( buffergeometry );

                if ( attribute ) {

                        attributes.remove( attribute );
                        wireframeAttributes.delete( buffergeometry );

                }

                bindingStates.releaseStatesOfGeometry( buffergeometry );

                if ( geometry.isInstancedBufferGeometry === true ) {

                        delete geometry._maxInstanceCount;

                }

                //

                info.memory.geometries --;

        }

        function get( object, geometry ) {

                let buffergeometry = geometries.get( geometry );

                if ( buffergeometry ) return buffergeometry;

                geometry.addEventListener( 'dispose', onGeometryDispose );

                if ( geometry.isBufferGeometry ) {

                        buffergeometry = geometry;

                } else if ( geometry.isGeometry ) {

                        if ( geometry._bufferGeometry === undefined ) {

                                geometry._bufferGeometry = new BufferGeometry().setFromObject( object );

                        }

                        buffergeometry = geometry._bufferGeometry;

                }

                geometries.set( geometry, buffergeometry );

                info.memory.geometries ++;

                return buffergeometry;

        }

        function update( geometry ) {

                const geometryAttributes = geometry.attributes;

                // Updating index buffer in VAO now. See WebGLBindingStates.

                for ( const name in geometryAttributes ) {

                        attributes.update( geometryAttributes[ name ], 34962 );

                }

                // morph targets

                const morphAttributes = geometry.morphAttributes;

                for ( const name in morphAttributes ) {

                        const array = morphAttributes[ name ];

                        for ( let i = 0, l = array.length; i < l; i ++ ) {

                                attributes.update( array[ i ], 34962 );

                        }

                }

        }

        function updateWireframeAttribute( geometry ) {

                const indices = [];

                const geometryIndex = geometry.index;
                const geometryPosition = geometry.attributes.position;
                let version = 0;

                if ( geometryIndex !== null ) {

                        const array = geometryIndex.array;
                        version = geometryIndex.version;

                        for ( let i = 0, l = array.length; i < l; i += 3 ) {

                                const a = array[ i + 0 ];
                                const b = array[ i + 1 ];
                                const c = array[ i + 2 ];

                                indices.push( a, b, b, c, c, a );

                        }

                } else {

                        const array = geometryPosition.array;
                        version = geometryPosition.version;

                        for ( let i = 0, l = ( array.length / 3 ) - 1; i < l; i += 3 ) {

                                const a = i + 0;
                                const b = i + 1;
                                const c = i + 2;

                                indices.push( a, b, b, c, c, a );

                        }

                }

                const attribute = new ( arrayMax( indices ) > 65535 ? Uint32BufferAttribute : Uint16BufferAttribute )( indices, 1 );
                attribute.version = version;

                // Updating index buffer in VAO now. See WebGLBindingStates

                //

                const previousAttribute = wireframeAttributes.get( geometry );

                if ( previousAttribute ) attributes.remove( previousAttribute );

                //

                wireframeAttributes.set( geometry, attribute );

        }

        function getWireframeAttribute( geometry ) {

                const currentAttribute = wireframeAttributes.get( geometry );

                if ( currentAttribute ) {

                        const geometryIndex = geometry.index;

                        if ( geometryIndex !== null ) {

                                // if the attribute is obsolete, create a new one

                                if ( currentAttribute.version < geometryIndex.version ) {

                                        updateWireframeAttribute( geometry );

                                }

                        }

                } else {

                        updateWireframeAttribute( geometry );

                }

                return wireframeAttributes.get( geometry );

        }

        return {

                get: get,
                update: update,

                getWireframeAttribute: getWireframeAttribute

        };

}

function WebGLIndexedBufferRenderer( gl, extensions, info, capabilities ) {

        const isWebGL2 = capabilities.isWebGL2;

        let mode;

        function setMode( value ) {

                mode = value;

        }

        let type, bytesPerElement;

        function setIndex( value ) {

                type = value.type;
                bytesPerElement = value.bytesPerElement;

        }

        function render( start, count ) {

                gl.drawElements( mode, count, type, start * bytesPerElement );

                info.update( count, mode, 1 );

        }

        function renderInstances( start, count, primcount ) {

                if ( primcount === 0 ) return;

                let extension, methodName;

                if ( isWebGL2 ) {

                        extension = gl;
                        methodName = 'drawElementsInstanced';

                } else {

                        extension = extensions.get( 'ANGLE_instanced_arrays' );
                        methodName = 'drawElementsInstancedANGLE';

                        if ( extension === null ) {

                                console.error( 'THREE.WebGLIndexedBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' );
                                return;

                        }

                }

                extension[ methodName ]( mode, count, type, start * bytesPerElement, primcount );

                info.update( count, mode, primcount );

        }

        //

        this.setMode = setMode;
        this.setIndex = setIndex;
        this.render = render;
        this.renderInstances = renderInstances;

}

function WebGLInfo( gl ) {

        const memory = {
                geometries: 0,
                textures: 0
        };

        const render = {
                frame: 0,
                calls: 0,
                triangles: 0,
                points: 0,
                lines: 0
        };

        function update( count, mode, instanceCount ) {

                render.calls ++;

                switch ( mode ) {

                        case 4:
                                render.triangles += instanceCount * ( count / 3 );
                                break;

                        case 1:
                                render.lines += instanceCount * ( count / 2 );
                                break;

                        case 3:
                                render.lines += instanceCount * ( count - 1 );
                                break;

                        case 2:
                                render.lines += instanceCount * count;
                                break;

                        case 0:
                                render.points += instanceCount * count;
                                break;

                        default:
                                console.error( 'THREE.WebGLInfo: Unknown draw mode:', mode );
                                break;

                }

        }

        function reset() {

                render.frame ++;
                render.calls = 0;
                render.triangles = 0;
                render.points = 0;
                render.lines = 0;

        }

        return {
                memory: memory,
                render: render,
                programs: null,
                autoReset: true,
                reset: reset,
                update: update
        };

}

function numericalSort( a, b ) {

        return a[ 0 ] - b[ 0 ];

}

function absNumericalSort( a, b ) {

        return Math.abs( b[ 1 ] ) - Math.abs( a[ 1 ] );

}

function WebGLMorphtargets( gl ) {

        const influencesList = {};
        const morphInfluences = new Float32Array( 8 );

        const workInfluences = [];

        for ( let i = 0; i < 8; i ++ ) {

                workInfluences[ i ] = [ i, 0 ];

        }

        function update( object, geometry, material, program ) {

                const objectInfluences = object.morphTargetInfluences;

                // When object doesn't have morph target influences defined, we treat it as a 0-length array
                // This is important to make sure we set up morphTargetBaseInfluence / morphTargetInfluences

                const length = objectInfluences === undefined ? 0 : objectInfluences.length;

                let influences = influencesList[ geometry.id ];

                if ( influences === undefined ) {

                        // initialise list

                        influences = [];

                        for ( let i = 0; i < length; i ++ ) {

                                influences[ i ] = [ i, 0 ];

                        }

                        influencesList[ geometry.id ] = influences;

                }

                // Collect influences

                for ( let i = 0; i < length; i ++ ) {

                        const influence = influences[ i ];

                        influence[ 0 ] = i;
                        influence[ 1 ] = objectInfluences[ i ];

                }

                influences.sort( absNumericalSort );

                for ( let i = 0; i < 8; i ++ ) {

                        if ( i < length && influences[ i ][ 1 ] ) {

                                workInfluences[ i ][ 0 ] = influences[ i ][ 0 ];
                                workInfluences[ i ][ 1 ] = influences[ i ][ 1 ];

                        } else {

                                workInfluences[ i ][ 0 ] = Number.MAX_SAFE_INTEGER;
                                workInfluences[ i ][ 1 ] = 0;

                        }

                }

                workInfluences.sort( numericalSort );

                const morphTargets = material.morphTargets && geometry.morphAttributes.position;
                const morphNormals = material.morphNormals && geometry.morphAttributes.normal;

                let morphInfluencesSum = 0;

                for ( let i = 0; i < 8; i ++ ) {

                        const influence = workInfluences[ i ];
                        const index = influence[ 0 ];
                        const value = influence[ 1 ];

                        if ( index !== Number.MAX_SAFE_INTEGER && value ) {

                                if ( morphTargets && geometry.getAttribute( 'morphTarget' + i ) !== morphTargets[ index ] ) {

                                        geometry.setAttribute( 'morphTarget' + i, morphTargets[ index ] );

                                }

                                if ( morphNormals && geometry.getAttribute( 'morphNormal' + i ) !== morphNormals[ index ] ) {

                                        geometry.setAttribute( 'morphNormal' + i, morphNormals[ index ] );

                                }

                                morphInfluences[ i ] = value;
                                morphInfluencesSum += value;

                        } else {

                                if ( morphTargets && geometry.hasAttribute( 'morphTarget' + i ) === true ) {

                                        geometry.deleteAttribute( 'morphTarget' + i );

                                }

                                if ( morphNormals && geometry.hasAttribute( 'morphNormal' + i ) === true ) {

                                        geometry.deleteAttribute( 'morphNormal' + i );

                                }

                                morphInfluences[ i ] = 0;

                        }

                }

                // GLSL shader uses formula baseinfluence * base + sum(target * influence)
                // This allows us to switch between absolute morphs and relative morphs without changing shader code
                // When baseinfluence = 1 - sum(influence), the above is equivalent to sum((target - base) * influence)
                const morphBaseInfluence = geometry.morphTargetsRelative ? 1 : 1 - morphInfluencesSum;

                program.getUniforms().setValue( gl, 'morphTargetBaseInfluence', morphBaseInfluence );
                program.getUniforms().setValue( gl, 'morphTargetInfluences', morphInfluences );

        }

        return {

                update: update

        };

}

function WebGLObjects( gl, geometries, attributes, info ) {

        let updateMap = new WeakMap();

        function update( object ) {

                const frame = info.render.frame;

                const geometry = object.geometry;
                const buffergeometry = geometries.get( object, geometry );

                // Update once per frame

                if ( updateMap.get( buffergeometry ) !== frame ) {

                        if ( geometry.isGeometry ) {

                                buffergeometry.updateFromObject( object );

                        }

                        geometries.update( buffergeometry );

                        updateMap.set( buffergeometry, frame );

                }

                if ( object.isInstancedMesh ) {

                        attributes.update( object.instanceMatrix, 34962 );

                        if ( object.instanceColor !== null ) {

                                attributes.update( object.instanceColor, 34962 );

                        }

                }

                return buffergeometry;

        }

        function dispose() {

                updateMap = new WeakMap();

        }

        return {

                update: update,
                dispose: dispose

        };

}

function DataTexture2DArray( data = null, width = 1, height = 1, depth = 1 ) {

        Texture.call( this, null );

        this.image = { data, width, height, depth };

        this.magFilter = NearestFilter;
        this.minFilter = NearestFilter;

        this.wrapR = ClampToEdgeWrapping;

        this.generateMipmaps = false;
        this.flipY = false;

        this.needsUpdate = true;

}

DataTexture2DArray.prototype = Object.create( Texture.prototype );
DataTexture2DArray.prototype.constructor = DataTexture2DArray;
DataTexture2DArray.prototype.isDataTexture2DArray = true;

function DataTexture3D( data = null, width = 1, height = 1, depth = 1 ) {

        // We're going to add .setXXX() methods for setting properties later.
        // Users can still set in DataTexture3D directly.
        //
        //      const texture = new THREE.DataTexture3D( data, width, height, depth );
        //      texture.anisotropy = 16;
        //
        // See #14839

        Texture.call( this, null );

        this.image = { data, width, height, depth };

        this.magFilter = NearestFilter;
        this.minFilter = NearestFilter;

        this.wrapR = ClampToEdgeWrapping;

        this.generateMipmaps = false;
        this.flipY = false;

        this.needsUpdate = true;


}

DataTexture3D.prototype = Object.create( Texture.prototype );
DataTexture3D.prototype.constructor = DataTexture3D;
DataTexture3D.prototype.isDataTexture3D = true;

/**
 * Uniforms of a program.
 * Those form a tree structure with a special top-level container for the root,
 * which you get by calling 'new WebGLUniforms( gl, program )'.
 *
 *
 * Properties of inner nodes including the top-level container:
 *
 * .seq - array of nested uniforms
 * .map - nested uniforms by name
 *
 *
 * Methods of all nodes except the top-level container:
 *
 * .setValue( gl, value, [textures] )
 *
 *              uploads a uniform value(s)
 *      the 'textures' parameter is needed for sampler uniforms
 *
 *
 * Static methods of the top-level container (textures factorizations):
 *
 * .upload( gl, seq, values, textures )
 *
 *              sets uniforms in 'seq' to 'values[id].value'
 *
 * .seqWithValue( seq, values ) : filteredSeq
 *
 *              filters 'seq' entries with corresponding entry in values
 *
 *
 * Methods of the top-level container (textures factorizations):
 *
 * .setValue( gl, name, value, textures )
 *
 *              sets uniform with  name 'name' to 'value'
 *
 * .setOptional( gl, obj, prop )
 *
 *              like .set for an optional property of the object
 *
 */

const emptyTexture = new Texture();
const emptyTexture2dArray = new DataTexture2DArray();
const emptyTexture3d = new DataTexture3D();
const emptyCubeTexture = new CubeTexture();

// --- Utilities ---

// Array Caches (provide typed arrays for temporary by size)

const arrayCacheF32 = [];
const arrayCacheI32 = [];

// Float32Array caches used for uploading Matrix uniforms

const mat4array = new Float32Array( 16 );
const mat3array = new Float32Array( 9 );
const mat2array = new Float32Array( 4 );

// Flattening for arrays of vectors and matrices

function flatten( array, nBlocks, blockSize ) {

        const firstElem = array[ 0 ];

        if ( firstElem <= 0 || firstElem > 0 ) return array;
        // unoptimized: ! isNaN( firstElem )
        // see http://jacksondunstan.com/articles/983

        const n = nBlocks * blockSize;
        let r = arrayCacheF32[ n ];

        if ( r === undefined ) {

                r = new Float32Array( n );
                arrayCacheF32[ n ] = r;

        }

        if ( nBlocks !== 0 ) {

                firstElem.toArray( r, 0 );

                for ( let i = 1, offset = 0; i !== nBlocks; ++ i ) {

                        offset += blockSize;
                        array[ i ].toArray( r, offset );

                }

        }

        return r;

}

function arraysEqual( a, b ) {

        if ( a.length !== b.length ) return false;

        for ( let i = 0, l = a.length; i < l; i ++ ) {

                if ( a[ i ] !== b[ i ] ) return false;

        }

        return true;

}

function copyArray( a, b ) {

        for ( let i = 0, l = b.length; i < l; i ++ ) {

                a[ i ] = b[ i ];

        }

}

// Texture unit allocation

function allocTexUnits( textures, n ) {

        let r = arrayCacheI32[ n ];

        if ( r === undefined ) {

                r = new Int32Array( n );
                arrayCacheI32[ n ] = r;

        }

        for ( let i = 0; i !== n; ++ i ) {

                r[ i ] = textures.allocateTextureUnit();

        }

        return r;

}

// --- Setters ---

// Note: Defining these methods externally, because they come in a bunch
// and this way their names minify.

// Single scalar

function setValueV1f( gl, v ) {

        const cache = this.cache;

        if ( cache[ 0 ] === v ) return;

        gl.uniform1f( this.addr, v );

        cache[ 0 ] = v;

}

// Single float vector (from flat array or THREE.VectorN)

function setValueV2f( gl, v ) {

        const cache = this.cache;

        if ( v.x !== undefined ) {

                if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y ) {

                        gl.uniform2f( this.addr, v.x, v.y );

                        cache[ 0 ] = v.x;
                        cache[ 1 ] = v.y;

                }

        } else {

                if ( arraysEqual( cache, v ) ) return;

                gl.uniform2fv( this.addr, v );

                copyArray( cache, v );

        }

}

function setValueV3f( gl, v ) {

        const cache = this.cache;

        if ( v.x !== undefined ) {

                if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z ) {

                        gl.uniform3f( this.addr, v.x, v.y, v.z );

                        cache[ 0 ] = v.x;
                        cache[ 1 ] = v.y;
                        cache[ 2 ] = v.z;

                }

        } else if ( v.r !== undefined ) {

                if ( cache[ 0 ] !== v.r || cache[ 1 ] !== v.g || cache[ 2 ] !== v.b ) {

                        gl.uniform3f( this.addr, v.r, v.g, v.b );

                        cache[ 0 ] = v.r;
                        cache[ 1 ] = v.g;
                        cache[ 2 ] = v.b;

                }

        } else {

                if ( arraysEqual( cache, v ) ) return;

                gl.uniform3fv( this.addr, v );

                copyArray( cache, v );

        }

}

function setValueV4f( gl, v ) {

        const cache = this.cache;

        if ( v.x !== undefined ) {

                if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z || cache[ 3 ] !== v.w ) {

                        gl.uniform4f( this.addr, v.x, v.y, v.z, v.w );

                        cache[ 0 ] = v.x;
                        cache[ 1 ] = v.y;
                        cache[ 2 ] = v.z;
                        cache[ 3 ] = v.w;

                }

        } else {

                if ( arraysEqual( cache, v ) ) return;

                gl.uniform4fv( this.addr, v );

                copyArray( cache, v );

        }

}

// Single matrix (from flat array or MatrixN)

function setValueM2( gl, v ) {

        const cache = this.cache;
        const elements = v.elements;

        if ( elements === undefined ) {

                if ( arraysEqual( cache, v ) ) return;

                gl.uniformMatrix2fv( this.addr, false, v );

                copyArray( cache, v );

        } else {

                if ( arraysEqual( cache, elements ) ) return;

                mat2array.set( elements );

                gl.uniformMatrix2fv( this.addr, false, mat2array );

                copyArray( cache, elements );

        }

}

function setValueM3( gl, v ) {

        const cache = this.cache;
        const elements = v.elements;

        if ( elements === undefined ) {

                if ( arraysEqual( cache, v ) ) return;

                gl.uniformMatrix3fv( this.addr, false, v );

                copyArray( cache, v );

        } else {

                if ( arraysEqual( cache, elements ) ) return;

                mat3array.set( elements );

                gl.uniformMatrix3fv( this.addr, false, mat3array );

                copyArray( cache, elements );

        }

}

function setValueM4( gl, v ) {

        const cache = this.cache;
        const elements = v.elements;

        if ( elements === undefined ) {

                if ( arraysEqual( cache, v ) ) return;

                gl.uniformMatrix4fv( this.addr, false, v );

                copyArray( cache, v );

        } else {

                if ( arraysEqual( cache, elements ) ) return;

                mat4array.set( elements );

                gl.uniformMatrix4fv( this.addr, false, mat4array );

                copyArray( cache, elements );

        }

}

// Single texture (2D / Cube)

function setValueT1( gl, v, textures ) {

        const cache = this.cache;
        const unit = textures.allocateTextureUnit();

        if ( cache[ 0 ] !== unit ) {

                gl.uniform1i( this.addr, unit );
                cache[ 0 ] = unit;

        }

        textures.safeSetTexture2D( v || emptyTexture, unit );

}

function setValueT2DArray1( gl, v, textures ) {

        const cache = this.cache;
        const unit = textures.allocateTextureUnit();

        if ( cache[ 0 ] !== unit ) {

                gl.uniform1i( this.addr, unit );
                cache[ 0 ] = unit;

        }

        textures.setTexture2DArray( v || emptyTexture2dArray, unit );

}

function setValueT3D1( gl, v, textures ) {

        const cache = this.cache;
        const unit = textures.allocateTextureUnit();

        if ( cache[ 0 ] !== unit ) {

                gl.uniform1i( this.addr, unit );
                cache[ 0 ] = unit;

        }

        textures.setTexture3D( v || emptyTexture3d, unit );

}

function setValueT6( gl, v, textures ) {

        const cache = this.cache;
        const unit = textures.allocateTextureUnit();

        if ( cache[ 0 ] !== unit ) {

                gl.uniform1i( this.addr, unit );
                cache[ 0 ] = unit;

        }

        textures.safeSetTextureCube( v || emptyCubeTexture, unit );

}

// Integer / Boolean vectors or arrays thereof (always flat arrays)

function setValueV1i( gl, v ) {

        const cache = this.cache;

        if ( cache[ 0 ] === v ) return;

        gl.uniform1i( this.addr, v );

        cache[ 0 ] = v;

}

function setValueV2i( gl, v ) {

        const cache = this.cache;

        if ( arraysEqual( cache, v ) ) return;

        gl.uniform2iv( this.addr, v );

        copyArray( cache, v );

}

function setValueV3i( gl, v ) {

        const cache = this.cache;

        if ( arraysEqual( cache, v ) ) return;

        gl.uniform3iv( this.addr, v );

        copyArray( cache, v );

}

function setValueV4i( gl, v ) {

        const cache = this.cache;

        if ( arraysEqual( cache, v ) ) return;

        gl.uniform4iv( this.addr, v );

        copyArray( cache, v );

}

// uint

function setValueV1ui( gl, v ) {

        const cache = this.cache;

        if ( cache[ 0 ] === v ) return;

        gl.uniform1ui( this.addr, v );

        cache[ 0 ] = v;

}

// Helper to pick the right setter for the singular case

function getSingularSetter( type ) {

        switch ( type ) {

                case 0x1406: return setValueV1f; // FLOAT
                case 0x8b50: return setValueV2f; // _VEC2
                case 0x8b51: return setValueV3f; // _VEC3
                case 0x8b52: return setValueV4f; // _VEC4

                case 0x8b5a: return setValueM2; // _MAT2
                case 0x8b5b: return setValueM3; // _MAT3
                case 0x8b5c: return setValueM4; // _MAT4

                case 0x1404: case 0x8b56: return setValueV1i; // INT, BOOL
                case 0x8b53: case 0x8b57: return setValueV2i; // _VEC2
                case 0x8b54: case 0x8b58: return setValueV3i; // _VEC3
                case 0x8b55: case 0x8b59: return setValueV4i; // _VEC4

                case 0x1405: return setValueV1ui; // UINT

                case 0x8b5e: // SAMPLER_2D
                case 0x8d66: // SAMPLER_EXTERNAL_OES
                case 0x8dca: // INT_SAMPLER_2D
                case 0x8dd2: // UNSIGNED_INT_SAMPLER_2D
                case 0x8b62: // SAMPLER_2D_SHADOW
                        return setValueT1;

                case 0x8b5f: // SAMPLER_3D
                case 0x8dcb: // INT_SAMPLER_3D
                case 0x8dd3: // UNSIGNED_INT_SAMPLER_3D
                        return setValueT3D1;

                case 0x8b60: // SAMPLER_CUBE
                case 0x8dcc: // INT_SAMPLER_CUBE
                case 0x8dd4: // UNSIGNED_INT_SAMPLER_CUBE
                case 0x8dc5: // SAMPLER_CUBE_SHADOW
                        return setValueT6;

                case 0x8dc1: // SAMPLER_2D_ARRAY
                case 0x8dcf: // INT_SAMPLER_2D_ARRAY
                case 0x8dd7: // UNSIGNED_INT_SAMPLER_2D_ARRAY
                case 0x8dc4: // SAMPLER_2D_ARRAY_SHADOW
                        return setValueT2DArray1;

        }

}

// Array of scalars
function setValueV1fArray( gl, v ) {

        gl.uniform1fv( this.addr, v );

}

// Integer / Boolean vectors or arrays thereof (always flat arrays)
function setValueV1iArray( gl, v ) {

        gl.uniform1iv( this.addr, v );

}

function setValueV2iArray( gl, v ) {

        gl.uniform2iv( this.addr, v );

}

function setValueV3iArray( gl, v ) {

        gl.uniform3iv( this.addr, v );

}

function setValueV4iArray( gl, v ) {

        gl.uniform4iv( this.addr, v );

}


// Array of vectors (flat or from THREE classes)

function setValueV2fArray( gl, v ) {

        const data = flatten( v, this.size, 2 );

        gl.uniform2fv( this.addr, data );

}

function setValueV3fArray( gl, v ) {

        const data = flatten( v, this.size, 3 );

        gl.uniform3fv( this.addr, data );

}

function setValueV4fArray( gl, v ) {

        const data = flatten( v, this.size, 4 );

        gl.uniform4fv( this.addr, data );

}

// Array of matrices (flat or from THREE clases)

function setValueM2Array( gl, v ) {

        const data = flatten( v, this.size, 4 );

        gl.uniformMatrix2fv( this.addr, false, data );

}

function setValueM3Array( gl, v ) {

        const data = flatten( v, this.size, 9 );

        gl.uniformMatrix3fv( this.addr, false, data );

}

function setValueM4Array( gl, v ) {

        const data = flatten( v, this.size, 16 );

        gl.uniformMatrix4fv( this.addr, false, data );

}

// Array of textures (2D / Cube)

function setValueT1Array( gl, v, textures ) {

        const n = v.length;

        const units = allocTexUnits( textures, n );

        gl.uniform1iv( this.addr, units );

        for ( let i = 0; i !== n; ++ i ) {

                textures.safeSetTexture2D( v[ i ] || emptyTexture, units[ i ] );

        }

}

function setValueT6Array( gl, v, textures ) {

        const n = v.length;

        const units = allocTexUnits( textures, n );

        gl.uniform1iv( this.addr, units );

        for ( let i = 0; i !== n; ++ i ) {

                textures.safeSetTextureCube( v[ i ] || emptyCubeTexture, units[ i ] );

        }

}

// Helper to pick the right setter for a pure (bottom-level) array

function getPureArraySetter( type ) {

        switch ( type ) {

                case 0x1406: return setValueV1fArray; // FLOAT
                case 0x8b50: return setValueV2fArray; // _VEC2
                case 0x8b51: return setValueV3fArray; // _VEC3
                case 0x8b52: return setValueV4fArray; // _VEC4

                case 0x8b5a: return setValueM2Array; // _MAT2
                case 0x8b5b: return setValueM3Array; // _MAT3
                case 0x8b5c: return setValueM4Array; // _MAT4

                case 0x1404: case 0x8b56: return setValueV1iArray; // INT, BOOL
                case 0x8b53: case 0x8b57: return setValueV2iArray; // _VEC2
                case 0x8b54: case 0x8b58: return setValueV3iArray; // _VEC3
                case 0x8b55: case 0x8b59: return setValueV4iArray; // _VEC4

                case 0x8b5e: // SAMPLER_2D
                case 0x8d66: // SAMPLER_EXTERNAL_OES
                case 0x8dca: // INT_SAMPLER_2D
                case 0x8dd2: // UNSIGNED_INT_SAMPLER_2D
                case 0x8b62: // SAMPLER_2D_SHADOW
                        return setValueT1Array;

                case 0x8b60: // SAMPLER_CUBE
                case 0x8dcc: // INT_SAMPLER_CUBE
                case 0x8dd4: // UNSIGNED_INT_SAMPLER_CUBE
                case 0x8dc5: // SAMPLER_CUBE_SHADOW
                        return setValueT6Array;

        }

}

// --- Uniform Classes ---

function SingleUniform( id, activeInfo, addr ) {

        this.id = id;
        this.addr = addr;
        this.cache = [];
        this.setValue = getSingularSetter( activeInfo.type );

        // this.path = activeInfo.name; // DEBUG

}

function PureArrayUniform( id, activeInfo, addr ) {

        this.id = id;
        this.addr = addr;
        this.cache = [];
        this.size = activeInfo.size;
        this.setValue = getPureArraySetter( activeInfo.type );

        // this.path = activeInfo.name; // DEBUG

}

PureArrayUniform.prototype.updateCache = function ( data ) {

        const cache = this.cache;

        if ( data instanceof Float32Array && cache.length !== data.length ) {

                this.cache = new Float32Array( data.length );

        }

        copyArray( cache, data );

};

function StructuredUniform( id ) {

        this.id = id;

        this.seq = [];
        this.map = {};

}

StructuredUniform.prototype.setValue = function ( gl, value, textures ) {

        const seq = this.seq;

        for ( let i = 0, n = seq.length; i !== n; ++ i ) {

                const u = seq[ i ];
                u.setValue( gl, value[ u.id ], textures );

        }

};

// --- Top-level ---

// Parser - builds up the property tree from the path strings

const RePathPart = /([\w\d_]+)(\])?(\[|\.)?/g;

// extracts
//      - the identifier (member name or array index)
//  - followed by an optional right bracket (found when array index)
//  - followed by an optional left bracket or dot (type of subscript)
//
// Note: These portions can be read in a non-overlapping fashion and
// allow straightforward parsing of the hierarchy that WebGL encodes
// in the uniform names.

function addUniform( container, uniformObject ) {

        container.seq.push( uniformObject );
        container.map[ uniformObject.id ] = uniformObject;

}

function parseUniform( activeInfo, addr, container ) {

        const path = activeInfo.name,
                pathLength = path.length;

        // reset RegExp object, because of the early exit of a previous run
        RePathPart.lastIndex = 0;

        while ( true ) {

                const match = RePathPart.exec( path ),
                        matchEnd = RePathPart.lastIndex;

                let id = match[ 1 ];
                const idIsIndex = match[ 2 ] === ']',
                        subscript = match[ 3 ];

                if ( idIsIndex ) id = id | 0; // convert to integer

                if ( subscript === undefined || subscript === '[' && matchEnd + 2 === pathLength ) {

                        // bare name or "pure" bottom-level array "[0]" suffix

                        addUniform( container, subscript === undefined ?
                                new SingleUniform( id, activeInfo, addr ) :
                                new PureArrayUniform( id, activeInfo, addr ) );

                        break;

                } else {

                        // step into inner node / create it in case it doesn't exist

                        const map = container.map;
                        let next = map[ id ];

                        if ( next === undefined ) {

                                next = new StructuredUniform( id );
                                addUniform( container, next );

                        }

                        container = next;

                }

        }

}

// Root Container

function WebGLUniforms( gl, program ) {

        this.seq = [];
        this.map = {};

        const n = gl.getProgramParameter( program, 35718 );

        for ( let i = 0; i < n; ++ i ) {

                const info = gl.getActiveUniform( program, i ),
                        addr = gl.getUniformLocation( program, info.name );

                parseUniform( info, addr, this );

        }

}

WebGLUniforms.prototype.setValue = function ( gl, name, value, textures ) {

        const u = this.map[ name ];

        if ( u !== undefined ) u.setValue( gl, value, textures );

};

WebGLUniforms.prototype.setOptional = function ( gl, object, name ) {

        const v = object[ name ];

        if ( v !== undefined ) this.setValue( gl, name, v );

};


// Static interface

WebGLUniforms.upload = function ( gl, seq, values, textures ) {

        for ( let i = 0, n = seq.length; i !== n; ++ i ) {

                const u = seq[ i ],
                        v = values[ u.id ];

                if ( v.needsUpdate !== false ) {

                        // note: always updating when .needsUpdate is undefined
                        u.setValue( gl, v.value, textures );

                }

        }

};

WebGLUniforms.seqWithValue = function ( seq, values ) {

        const r = [];

        for ( let i = 0, n = seq.length; i !== n; ++ i ) {

                const u = seq[ i ];
                if ( u.id in values ) r.push( u );

        }

        return r;

};

function WebGLShader( gl, type, string ) {

        const shader = gl.createShader( type );

        gl.shaderSource( shader, string );
        gl.compileShader( shader );

        return shader;

}

let programIdCount = 0;

function addLineNumbers( string ) {

        const lines = string.split( '\n' );

        for ( let i = 0; i < lines.length; i ++ ) {

                lines[ i ] = ( i + 1 ) + ': ' + lines[ i ];

        }

        return lines.join( '\n' );

}

function getEncodingComponents( encoding ) {

        switch ( encoding ) {

                case LinearEncoding:
                        return [ 'Linear', '( value )' ];
                case sRGBEncoding:
                        return [ 'sRGB', '( value )' ];
                case RGBEEncoding:
                        return [ 'RGBE', '( value )' ];
                case RGBM7Encoding:
                        return [ 'RGBM', '( value, 7.0 )' ];
                case RGBM16Encoding:
                        return [ 'RGBM', '( value, 16.0 )' ];
                case RGBDEncoding:
                        return [ 'RGBD', '( value, 256.0 )' ];
                case GammaEncoding:
                        return [ 'Gamma', '( value, float( GAMMA_FACTOR ) )' ];
                case LogLuvEncoding:
                        return [ 'LogLuv', '( value )' ];
                default:
                        console.warn( 'THREE.WebGLProgram: Unsupported encoding:', encoding );
                        return [ 'Linear', '( value )' ];

        }

}

function getShaderErrors( gl, shader, type ) {

        const status = gl.getShaderParameter( shader, 35713 );
        const log = gl.getShaderInfoLog( shader ).trim();

        if ( status && log === '' ) return '';

        // --enable-privileged-webgl-extension
        // console.log( '**' + type + '**', gl.getExtension( 'WEBGL_debug_shaders' ).getTranslatedShaderSource( shader ) );

        const source = gl.getShaderSource( shader );

        return 'THREE.WebGLShader: gl.getShaderInfoLog() ' + type + '\n' + log + addLineNumbers( source );

}

function getTexelDecodingFunction( functionName, encoding ) {

        const components = getEncodingComponents( encoding );
        return 'vec4 ' + functionName + '( vec4 value ) { return ' + components[ 0 ] + 'ToLinear' + components[ 1 ] + '; }';

}

function getTexelEncodingFunction( functionName, encoding ) {

        const components = getEncodingComponents( encoding );
        return 'vec4 ' + functionName + '( vec4 value ) { return LinearTo' + components[ 0 ] + components[ 1 ] + '; }';

}

function getToneMappingFunction( functionName, toneMapping ) {

        let toneMappingName;

        switch ( toneMapping ) {

                case LinearToneMapping:
                        toneMappingName = 'Linear';
                        break;

                case ReinhardToneMapping:
                        toneMappingName = 'Reinhard';
                        break;

                case CineonToneMapping:
                        toneMappingName = 'OptimizedCineon';
                        break;

                case ACESFilmicToneMapping:
                        toneMappingName = 'ACESFilmic';
                        break;

                case CustomToneMapping:
                        toneMappingName = 'Custom';
                        break;

                default:
                        console.warn( 'THREE.WebGLProgram: Unsupported toneMapping:', toneMapping );
                        toneMappingName = 'Linear';

        }

        return 'vec3 ' + functionName + '( vec3 color ) { return ' + toneMappingName + 'ToneMapping( color ); }';

}

function generateExtensions( parameters ) {

        const chunks = [
                ( parameters.extensionDerivatives || parameters.envMapCubeUV || parameters.bumpMap || parameters.tangentSpaceNormalMap || parameters.clearcoatNormalMap || parameters.flatShading || parameters.shaderID === 'physical' ) ? '#extension GL_OES_standard_derivatives : enable' : '',
                ( parameters.extensionFragDepth || parameters.logarithmicDepthBuffer ) && parameters.rendererExtensionFragDepth ? '#extension GL_EXT_frag_depth : enable' : '',
                ( parameters.extensionDrawBuffers && parameters.rendererExtensionDrawBuffers ) ? '#extension GL_EXT_draw_buffers : require' : '',
                ( parameters.extensionShaderTextureLOD || parameters.envMap ) && parameters.rendererExtensionShaderTextureLod ? '#extension GL_EXT_shader_texture_lod : enable' : ''
        ];

        return chunks.filter( filterEmptyLine ).join( '\n' );

}

function generateDefines( defines ) {

        const chunks = [];

        for ( const name in defines ) {

                const value = defines[ name ];

                if ( value === false ) continue;

                chunks.push( '#define ' + name + ' ' + value );

        }

        return chunks.join( '\n' );

}

function fetchAttributeLocations( gl, program ) {

        const attributes = {};

        const n = gl.getProgramParameter( program, 35721 );

        for ( let i = 0; i < n; i ++ ) {

                const info = gl.getActiveAttrib( program, i );
                const name = info.name;

                // console.log( 'THREE.WebGLProgram: ACTIVE VERTEX ATTRIBUTE:', name, i );

                attributes[ name ] = gl.getAttribLocation( program, name );

        }

        return attributes;

}

function filterEmptyLine( string ) {

        return string !== '';

}

function replaceLightNums( string, parameters ) {

        return string
                .replace( /NUM_DIR_LIGHTS/g, parameters.numDirLights )
                .replace( /NUM_SPOT_LIGHTS/g, parameters.numSpotLights )
                .replace( /NUM_RECT_AREA_LIGHTS/g, parameters.numRectAreaLights )
                .replace( /NUM_POINT_LIGHTS/g, parameters.numPointLights )
                .replace( /NUM_HEMI_LIGHTS/g, parameters.numHemiLights )
                .replace( /NUM_DIR_LIGHT_SHADOWS/g, parameters.numDirLightShadows )
                .replace( /NUM_SPOT_LIGHT_SHADOWS/g, parameters.numSpotLightShadows )
                .replace( /NUM_POINT_LIGHT_SHADOWS/g, parameters.numPointLightShadows );

}

function replaceClippingPlaneNums( string, parameters ) {

        return string
                .replace( /NUM_CLIPPING_PLANES/g, parameters.numClippingPlanes )
                .replace( /UNION_CLIPPING_PLANES/g, ( parameters.numClippingPlanes - parameters.numClipIntersection ) );

}

// Resolve Includes

const includePattern = /^[ \t]*#include +<([\w\d./]+)>/gm;

function resolveIncludes( string ) {

        return string.replace( includePattern, includeReplacer );

}

function includeReplacer( match, include ) {

        const string = ShaderChunk[ include ];

        if ( string === undefined ) {

                throw new Error( 'Can not resolve #include <' + include + '>' );

        }

        return resolveIncludes( string );

}

// Unroll Loops

const deprecatedUnrollLoopPattern = /#pragma unroll_loop[\s]+?for \( int i \= (\d+)\; i < (\d+)\; i \+\+ \) \{([\s\S]+?)(?=\})\}/g;
const unrollLoopPattern = /#pragma unroll_loop_start\s+for\s*\(\s*int\s+i\s*=\s*(\d+)\s*;\s*i\s*<\s*(\d+)\s*;\s*i\s*\+\+\s*\)\s*{([\s\S]+?)}\s+#pragma unroll_loop_end/g;

function unrollLoops( string ) {

        return string
                .replace( unrollLoopPattern, loopReplacer )
                .replace( deprecatedUnrollLoopPattern, deprecatedLoopReplacer );

}

function deprecatedLoopReplacer( match, start, end, snippet ) {

        console.warn( 'WebGLProgram: #pragma unroll_loop shader syntax is deprecated. Please use #pragma unroll_loop_start syntax instead.' );
        return loopReplacer( match, start, end, snippet );

}

function loopReplacer( match, start, end, snippet ) {

        let string = '';

        for ( let i = parseInt( start ); i < parseInt( end ); i ++ ) {

                string += snippet
                        .replace( /\[\s*i\s*\]/g, '[ ' + i + ' ]' )
                        .replace( /UNROLLED_LOOP_INDEX/g, i );

        }

        return string;

}

//

function generatePrecision( parameters ) {

        let precisionstring = "precision " + parameters.precision + " float;\nprecision " + parameters.precision + " int;";

        if ( parameters.precision === "highp" ) {

                precisionstring += "\n#define HIGH_PRECISION";

        } else if ( parameters.precision === "mediump" ) {

                precisionstring += "\n#define MEDIUM_PRECISION";

        } else if ( parameters.precision === "lowp" ) {

                precisionstring += "\n#define LOW_PRECISION";

        }

        return precisionstring;

}

function generateShadowMapTypeDefine( parameters ) {

        let shadowMapTypeDefine = 'SHADOWMAP_TYPE_BASIC';

        if ( parameters.shadowMapType === PCFShadowMap ) {

                shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF';

        } else if ( parameters.shadowMapType === PCFSoftShadowMap ) {

                shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF_SOFT';

        } else if ( parameters.shadowMapType === VSMShadowMap ) {

                shadowMapTypeDefine = 'SHADOWMAP_TYPE_VSM';

        }

        return shadowMapTypeDefine;

}

function generateEnvMapTypeDefine( parameters ) {

        let envMapTypeDefine = 'ENVMAP_TYPE_CUBE';

        if ( parameters.envMap ) {

                switch ( parameters.envMapMode ) {

                        case CubeReflectionMapping:
                        case CubeRefractionMapping:
                                envMapTypeDefine = 'ENVMAP_TYPE_CUBE';
                                break;

                        case CubeUVReflectionMapping:
                        case CubeUVRefractionMapping:
                                envMapTypeDefine = 'ENVMAP_TYPE_CUBE_UV';
                                break;

                }

        }

        return envMapTypeDefine;

}

function generateEnvMapModeDefine( parameters ) {

        let envMapModeDefine = 'ENVMAP_MODE_REFLECTION';

        if ( parameters.envMap ) {

                switch ( parameters.envMapMode ) {

                        case CubeRefractionMapping:
                        case CubeUVRefractionMapping:

                                envMapModeDefine = 'ENVMAP_MODE_REFRACTION';
                                break;

                }

        }

        return envMapModeDefine;

}

function generateEnvMapBlendingDefine( parameters ) {

        let envMapBlendingDefine = 'ENVMAP_BLENDING_NONE';

        if ( parameters.envMap ) {

                switch ( parameters.combine ) {

                        case MultiplyOperation:
                                envMapBlendingDefine = 'ENVMAP_BLENDING_MULTIPLY';
                                break;

                        case MixOperation:
                                envMapBlendingDefine = 'ENVMAP_BLENDING_MIX';
                                break;

                        case AddOperation:
                                envMapBlendingDefine = 'ENVMAP_BLENDING_ADD';
                                break;

                }

        }

        return envMapBlendingDefine;

}

function WebGLProgram( renderer, cacheKey, parameters, bindingStates ) {

        const gl = renderer.getContext();

        const defines = parameters.defines;

        let vertexShader = parameters.vertexShader;
        let fragmentShader = parameters.fragmentShader;

        const shadowMapTypeDefine = generateShadowMapTypeDefine( parameters );
        const envMapTypeDefine = generateEnvMapTypeDefine( parameters );
        const envMapModeDefine = generateEnvMapModeDefine( parameters );
        const envMapBlendingDefine = generateEnvMapBlendingDefine( parameters );


        const gammaFactorDefine = ( renderer.gammaFactor > 0 ) ? renderer.gammaFactor : 1.0;

        const customExtensions = parameters.isWebGL2 ? '' : generateExtensions( parameters );

        const customDefines = generateDefines( defines );

        const program = gl.createProgram();

        let prefixVertex, prefixFragment;
        let versionString = parameters.glslVersion ? '#version ' + parameters.glslVersion + "\n" : '';

        if ( parameters.isRawShaderMaterial ) {

                prefixVertex = [

                        customDefines

                ].filter( filterEmptyLine ).join( '\n' );

                if ( prefixVertex.length > 0 ) {

                        prefixVertex += '\n';

                }

                prefixFragment = [

                        customExtensions,
                        customDefines

                ].filter( filterEmptyLine ).join( '\n' );

                if ( prefixFragment.length > 0 ) {

                        prefixFragment += '\n';

                }

        } else {

                prefixVertex = [

                        generatePrecision( parameters ),

                        '#define SHADER_NAME ' + parameters.shaderName,

                        customDefines,

                        parameters.instancing ? '#define USE_INSTANCING' : '',
                        parameters.instancingColor ? '#define USE_INSTANCING_COLOR' : '',

                        parameters.supportsVertexTextures ? '#define VERTEX_TEXTURES' : '',

                        '#define GAMMA_FACTOR ' + gammaFactorDefine,

                        '#define MAX_BONES ' + parameters.maxBones,
                        ( parameters.useFog && parameters.fog ) ? '#define USE_FOG' : '',
                        ( parameters.useFog && parameters.fogExp2 ) ? '#define FOG_EXP2' : '',

                        parameters.map ? '#define USE_MAP' : '',
                        parameters.envMap ? '#define USE_ENVMAP' : '',
                        parameters.envMap ? '#define ' + envMapModeDefine : '',
                        parameters.lightMap ? '#define USE_LIGHTMAP' : '',
                        parameters.aoMap ? '#define USE_AOMAP' : '',
                        parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',
                        parameters.bumpMap ? '#define USE_BUMPMAP' : '',
                        parameters.normalMap ? '#define USE_NORMALMAP' : '',
                        ( parameters.normalMap && parameters.objectSpaceNormalMap ) ? '#define OBJECTSPACE_NORMALMAP' : '',
                        ( parameters.normalMap && parameters.tangentSpaceNormalMap ) ? '#define TANGENTSPACE_NORMALMAP' : '',

                        parameters.clearcoatMap ? '#define USE_CLEARCOATMAP' : '',
                        parameters.clearcoatRoughnessMap ? '#define USE_CLEARCOAT_ROUGHNESSMAP' : '',
                        parameters.clearcoatNormalMap ? '#define USE_CLEARCOAT_NORMALMAP' : '',
                        parameters.displacementMap && parameters.supportsVertexTextures ? '#define USE_DISPLACEMENTMAP' : '',
                        parameters.specularMap ? '#define USE_SPECULARMAP' : '',
                        parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
                        parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
                        parameters.alphaMap ? '#define USE_ALPHAMAP' : '',
                        parameters.transmissionMap ? '#define USE_TRANSMISSIONMAP' : '',

                        parameters.vertexTangents ? '#define USE_TANGENT' : '',
                        parameters.vertexColors ? '#define USE_COLOR' : '',
                        parameters.vertexUvs ? '#define USE_UV' : '',
                        parameters.uvsVertexOnly ? '#define UVS_VERTEX_ONLY' : '',

                        parameters.flatShading ? '#define FLAT_SHADED' : '',

                        parameters.skinning ? '#define USE_SKINNING' : '',
                        parameters.useVertexTexture ? '#define BONE_TEXTURE' : '',

                        parameters.morphTargets ? '#define USE_MORPHTARGETS' : '',
                        parameters.morphNormals && parameters.flatShading === false ? '#define USE_MORPHNORMALS' : '',
                        parameters.doubleSided ? '#define DOUBLE_SIDED' : '',
                        parameters.flipSided ? '#define FLIP_SIDED' : '',

                        parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',
                        parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',

                        parameters.sizeAttenuation ? '#define USE_SIZEATTENUATION' : '',

                        parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',
                        ( parameters.logarithmicDepthBuffer && parameters.rendererExtensionFragDepth ) ? '#define USE_LOGDEPTHBUF_EXT' : '',

                        'uniform mat4 modelMatrix;',
                        'uniform mat4 modelViewMatrix;',
                        'uniform mat4 projectionMatrix;',
                        'uniform mat4 viewMatrix;',
                        'uniform mat3 normalMatrix;',
                        'uniform vec3 cameraPosition;',
                        'uniform bool isOrthographic;',

                        '#ifdef USE_INSTANCING',

                        '       attribute mat4 instanceMatrix;',

                        '#endif',

                        '#ifdef USE_INSTANCING_COLOR',

                        '       attribute vec3 instanceColor;',

                        '#endif',

                        'attribute vec3 position;',
                        'attribute vec3 normal;',
                        'attribute vec2 uv;',

                        '#ifdef USE_TANGENT',

                        '       attribute vec4 tangent;',

                        '#endif',

                        '#ifdef USE_COLOR',

                        '       attribute vec3 color;',

                        '#endif',

                        '#ifdef USE_MORPHTARGETS',

                        '       attribute vec3 morphTarget0;',
                        '       attribute vec3 morphTarget1;',
                        '       attribute vec3 morphTarget2;',
                        '       attribute vec3 morphTarget3;',

                        '       #ifdef USE_MORPHNORMALS',

                        '               attribute vec3 morphNormal0;',
                        '               attribute vec3 morphNormal1;',
                        '               attribute vec3 morphNormal2;',
                        '               attribute vec3 morphNormal3;',

                        '       #else',

                        '               attribute vec3 morphTarget4;',
                        '               attribute vec3 morphTarget5;',
                        '               attribute vec3 morphTarget6;',
                        '               attribute vec3 morphTarget7;',

                        '       #endif',

                        '#endif',

                        '#ifdef USE_SKINNING',

                        '       attribute vec4 skinIndex;',
                        '       attribute vec4 skinWeight;',

                        '#endif',

                        '\n'

                ].filter( filterEmptyLine ).join( '\n' );

                prefixFragment = [

                        customExtensions,

                        generatePrecision( parameters ),

                        '#define SHADER_NAME ' + parameters.shaderName,

                        customDefines,

                        parameters.alphaTest ? '#define ALPHATEST ' + parameters.alphaTest + ( parameters.alphaTest % 1 ? '' : '.0' ) : '', // add '.0' if integer

                        '#define GAMMA_FACTOR ' + gammaFactorDefine,

                        ( parameters.useFog && parameters.fog ) ? '#define USE_FOG' : '',
                        ( parameters.useFog && parameters.fogExp2 ) ? '#define FOG_EXP2' : '',

                        parameters.map ? '#define USE_MAP' : '',
                        parameters.matcap ? '#define USE_MATCAP' : '',
                        parameters.envMap ? '#define USE_ENVMAP' : '',
                        parameters.envMap ? '#define ' + envMapTypeDefine : '',
                        parameters.envMap ? '#define ' + envMapModeDefine : '',
                        parameters.envMap ? '#define ' + envMapBlendingDefine : '',
                        parameters.lightMap ? '#define USE_LIGHTMAP' : '',
                        parameters.aoMap ? '#define USE_AOMAP' : '',
                        parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',
                        parameters.bumpMap ? '#define USE_BUMPMAP' : '',
                        parameters.normalMap ? '#define USE_NORMALMAP' : '',
                        ( parameters.normalMap && parameters.objectSpaceNormalMap ) ? '#define OBJECTSPACE_NORMALMAP' : '',
                        ( parameters.normalMap && parameters.tangentSpaceNormalMap ) ? '#define TANGENTSPACE_NORMALMAP' : '',
                        parameters.clearcoatMap ? '#define USE_CLEARCOATMAP' : '',
                        parameters.clearcoatRoughnessMap ? '#define USE_CLEARCOAT_ROUGHNESSMAP' : '',
                        parameters.clearcoatNormalMap ? '#define USE_CLEARCOAT_NORMALMAP' : '',
                        parameters.specularMap ? '#define USE_SPECULARMAP' : '',
                        parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
                        parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
                        parameters.alphaMap ? '#define USE_ALPHAMAP' : '',

                        parameters.sheen ? '#define USE_SHEEN' : '',
                        parameters.transmissionMap ? '#define USE_TRANSMISSIONMAP' : '',

                        parameters.vertexTangents ? '#define USE_TANGENT' : '',
                        parameters.vertexColors || parameters.instancingColor ? '#define USE_COLOR' : '',
                        parameters.vertexUvs ? '#define USE_UV' : '',
                        parameters.uvsVertexOnly ? '#define UVS_VERTEX_ONLY' : '',

                        parameters.gradientMap ? '#define USE_GRADIENTMAP' : '',

                        parameters.flatShading ? '#define FLAT_SHADED' : '',

                        parameters.doubleSided ? '#define DOUBLE_SIDED' : '',
                        parameters.flipSided ? '#define FLIP_SIDED' : '',

                        parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',
                        parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',

                        parameters.premultipliedAlpha ? '#define PREMULTIPLIED_ALPHA' : '',

                        parameters.physicallyCorrectLights ? '#define PHYSICALLY_CORRECT_LIGHTS' : '',

                        parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',
                        ( parameters.logarithmicDepthBuffer && parameters.rendererExtensionFragDepth ) ? '#define USE_LOGDEPTHBUF_EXT' : '',

                        ( ( parameters.extensionShaderTextureLOD || parameters.envMap ) && parameters.rendererExtensionShaderTextureLod ) ? '#define TEXTURE_LOD_EXT' : '',

                        'uniform mat4 viewMatrix;',
                        'uniform vec3 cameraPosition;',
                        'uniform bool isOrthographic;',

                        ( parameters.toneMapping !== NoToneMapping ) ? '#define TONE_MAPPING' : '',
                        ( parameters.toneMapping !== NoToneMapping ) ? ShaderChunk[ 'tonemapping_pars_fragment' ] : '', // this code is required here because it is used by the toneMapping() function defined below
                        ( parameters.toneMapping !== NoToneMapping ) ? getToneMappingFunction( 'toneMapping', parameters.toneMapping ) : '',

                        parameters.dithering ? '#define DITHERING' : '',

                        ShaderChunk[ 'encodings_pars_fragment' ], // this code is required here because it is used by the various encoding/decoding function defined below
                        parameters.map ? getTexelDecodingFunction( 'mapTexelToLinear', parameters.mapEncoding ) : '',
                        parameters.matcap ? getTexelDecodingFunction( 'matcapTexelToLinear', parameters.matcapEncoding ) : '',
                        parameters.envMap ? getTexelDecodingFunction( 'envMapTexelToLinear', parameters.envMapEncoding ) : '',
                        parameters.emissiveMap ? getTexelDecodingFunction( 'emissiveMapTexelToLinear', parameters.emissiveMapEncoding ) : '',
                        parameters.lightMap ? getTexelDecodingFunction( 'lightMapTexelToLinear', parameters.lightMapEncoding ) : '',
                        getTexelEncodingFunction( 'linearToOutputTexel', parameters.outputEncoding ),

                        parameters.depthPacking ? '#define DEPTH_PACKING ' + parameters.depthPacking : '',

                        '\n'

                ].filter( filterEmptyLine ).join( '\n' );

        }

        vertexShader = resolveIncludes( vertexShader );
        vertexShader = replaceLightNums( vertexShader, parameters );
        vertexShader = replaceClippingPlaneNums( vertexShader, parameters );

        fragmentShader = resolveIncludes( fragmentShader );
        fragmentShader = replaceLightNums( fragmentShader, parameters );
        fragmentShader = replaceClippingPlaneNums( fragmentShader, parameters );

        vertexShader = unrollLoops( vertexShader );
        fragmentShader = unrollLoops( fragmentShader );

        if ( parameters.isWebGL2 && parameters.isRawShaderMaterial !== true ) {

                // GLSL 3.0 conversion for built-in materials and ShaderMaterial

                versionString = '#version 300 es\n';

                prefixVertex = [
                        '#define attribute in',
                        '#define varying out',
                        '#define texture2D texture'
                ].join( '\n' ) + '\n' + prefixVertex;

                prefixFragment = [
                        '#define varying in',
                        ( parameters.glslVersion === GLSL3 ) ? '' : 'out highp vec4 pc_fragColor;',
                        ( parameters.glslVersion === GLSL3 ) ? '' : '#define gl_FragColor pc_fragColor',
                        '#define gl_FragDepthEXT gl_FragDepth',
                        '#define texture2D texture',
                        '#define textureCube texture',
                        '#define texture2DProj textureProj',
                        '#define texture2DLodEXT textureLod',
                        '#define texture2DProjLodEXT textureProjLod',
                        '#define textureCubeLodEXT textureLod',
                        '#define texture2DGradEXT textureGrad',
                        '#define texture2DProjGradEXT textureProjGrad',
                        '#define textureCubeGradEXT textureGrad'
                ].join( '\n' ) + '\n' + prefixFragment;

        }

        const vertexGlsl = versionString + prefixVertex + vertexShader;
        const fragmentGlsl = versionString + prefixFragment + fragmentShader;

        // console.log( '*VERTEX*', vertexGlsl );
        // console.log( '*FRAGMENT*', fragmentGlsl );

        const glVertexShader = WebGLShader( gl, 35633, vertexGlsl );
        const glFragmentShader = WebGLShader( gl, 35632, fragmentGlsl );

        gl.attachShader( program, glVertexShader );
        gl.attachShader( program, glFragmentShader );

        // Force a particular attribute to index 0.

        if ( parameters.index0AttributeName !== undefined ) {

                gl.bindAttribLocation( program, 0, parameters.index0AttributeName );

        } else if ( parameters.morphTargets === true ) {

                // programs with morphTargets displace position out of attribute 0
                gl.bindAttribLocation( program, 0, 'position' );

        }

        gl.linkProgram( program );

        // check for link errors
        if ( renderer.debug.checkShaderErrors ) {

                const programLog = gl.getProgramInfoLog( program ).trim();
                const vertexLog = gl.getShaderInfoLog( glVertexShader ).trim();
                const fragmentLog = gl.getShaderInfoLog( glFragmentShader ).trim();

                let runnable = true;
                let haveDiagnostics = true;

                if ( gl.getProgramParameter( program, 35714 ) === false ) {

                        runnable = false;

                        const vertexErrors = getShaderErrors( gl, glVertexShader, 'vertex' );
                        const fragmentErrors = getShaderErrors( gl, glFragmentShader, 'fragment' );

                        console.error( 'THREE.WebGLProgram: shader error: ', gl.getError(), '35715', gl.getProgramParameter( program, 35715 ), 'gl.getProgramInfoLog', programLog, vertexErrors, fragmentErrors );

                } else if ( programLog !== '' ) {

                        console.warn( 'THREE.WebGLProgram: gl.getProgramInfoLog()', programLog );

                } else if ( vertexLog === '' || fragmentLog === '' ) {

                        haveDiagnostics = false;

                }

                if ( haveDiagnostics ) {

                        this.diagnostics = {

                                runnable: runnable,

                                programLog: programLog,

                                vertexShader: {

                                        log: vertexLog,
                                        prefix: prefixVertex

                                },

                                fragmentShader: {

                                        log: fragmentLog,
                                        prefix: prefixFragment

                                }

                        };

                }

        }

        // Clean up

        // Crashes in iOS9 and iOS10. #18402
        // gl.detachShader( program, glVertexShader );
        // gl.detachShader( program, glFragmentShader );

        gl.deleteShader( glVertexShader );
        gl.deleteShader( glFragmentShader );

        // set up caching for uniform locations

        let cachedUniforms;

        this.getUniforms = function () {

                if ( cachedUniforms === undefined ) {

                        cachedUniforms = new WebGLUniforms( gl, program );

                }

                return cachedUniforms;

        };

        // set up caching for attribute locations

        let cachedAttributes;

        this.getAttributes = function () {

                if ( cachedAttributes === undefined ) {

                        cachedAttributes = fetchAttributeLocations( gl, program );

                }

                return cachedAttributes;

        };

        // free resource

        this.destroy = function () {

                bindingStates.releaseStatesOfProgram( this );

                gl.deleteProgram( program );
                this.program = undefined;

        };

        //

        this.name = parameters.shaderName;
        this.id = programIdCount ++;
        this.cacheKey = cacheKey;
        this.usedTimes = 1;
        this.program = program;
        this.vertexShader = glVertexShader;
        this.fragmentShader = glFragmentShader;

        return this;

}

function WebGLPrograms( renderer, cubemaps, extensions, capabilities, bindingStates, clipping ) {

        const programs = [];

        const isWebGL2 = capabilities.isWebGL2;
        const logarithmicDepthBuffer = capabilities.logarithmicDepthBuffer;
        const floatVertexTextures = capabilities.floatVertexTextures;
        const maxVertexUniforms = capabilities.maxVertexUniforms;
        const vertexTextures = capabilities.vertexTextures;

        let precision = capabilities.precision;

        const shaderIDs = {
                MeshDepthMaterial: 'depth',
                MeshDistanceMaterial: 'distanceRGBA',
                MeshNormalMaterial: 'normal',
                MeshBasicMaterial: 'basic',
                MeshLambertMaterial: 'lambert',
                MeshPhongMaterial: 'phong',
                MeshToonMaterial: 'toon',
                MeshStandardMaterial: 'physical',
                MeshPhysicalMaterial: 'physical',
                MeshMatcapMaterial: 'matcap',
                LineBasicMaterial: 'basic',
                LineDashedMaterial: 'dashed',
                PointsMaterial: 'points',
                ShadowMaterial: 'shadow',
                SpriteMaterial: 'sprite'
        };

        const parameterNames = [
                "precision", "isWebGL2", "supportsVertexTextures", "outputEncoding", "instancing", "instancingColor",
                "map", "mapEncoding", "matcap", "matcapEncoding", "envMap", "envMapMode", "envMapEncoding", "envMapCubeUV",
                "lightMap", "lightMapEncoding", "aoMap", "emissiveMap", "emissiveMapEncoding", "bumpMap", "normalMap", "objectSpaceNormalMap", "tangentSpaceNormalMap", "clearcoatMap", "clearcoatRoughnessMap", "clearcoatNormalMap", "displacementMap", "specularMap",
                "roughnessMap", "metalnessMap", "gradientMap",
                "alphaMap", "combine", "vertexColors", "vertexTangents", "vertexUvs", "uvsVertexOnly", "fog", "useFog", "fogExp2",
                "flatShading", "sizeAttenuation", "logarithmicDepthBuffer", "skinning",
                "maxBones", "useVertexTexture", "morphTargets", "morphNormals",
                "maxMorphTargets", "maxMorphNormals", "premultipliedAlpha",
                "numDirLights", "numPointLights", "numSpotLights", "numHemiLights", "numRectAreaLights",
                "numDirLightShadows", "numPointLightShadows", "numSpotLightShadows",
                "shadowMapEnabled", "shadowMapType", "toneMapping", 'physicallyCorrectLights',
                "alphaTest", "doubleSided", "flipSided", "numClippingPlanes", "numClipIntersection", "depthPacking", "dithering",
                "sheen", "transmissionMap"
        ];

        function getMaxBones( object ) {

                const skeleton = object.skeleton;
                const bones = skeleton.bones;

                if ( floatVertexTextures ) {

                        return 1024;

                } else {

                        // default for when object is not specified
                        // ( for example when prebuilding shader to be used with multiple objects )
                        //
                        //  - leave some extra space for other uniforms
                        //  - limit here is ANGLE's 254 max uniform vectors
                        //    (up to 54 should be safe)

                        const nVertexUniforms = maxVertexUniforms;
                        const nVertexMatrices = Math.floor( ( nVertexUniforms - 20 ) / 4 );

                        const maxBones = Math.min( nVertexMatrices, bones.length );

                        if ( maxBones < bones.length ) {

                                console.warn( 'THREE.WebGLRenderer: Skeleton has ' + bones.length + ' bones. This GPU supports ' + maxBones + '.' );
                                return 0;

                        }

                        return maxBones;

                }

        }

        function getTextureEncodingFromMap( map ) {

                let encoding;

                if ( ! map ) {

                        encoding = LinearEncoding;

                } else if ( map.isTexture ) {

                        encoding = map.encoding;

                } else if ( map.isWebGLRenderTarget ) {

                        console.warn( "THREE.WebGLPrograms.getTextureEncodingFromMap: don't use render targets as textures. Use their .texture property instead." );
                        encoding = map.texture.encoding;

                }

                return encoding;

        }

        function getParameters( material, lights, shadows, scene, object ) {

                const fog = scene.fog;
                const environment = material.isMeshStandardMaterial ? scene.environment : null;

                const envMap = cubemaps.get( material.envMap || environment );

                const shaderID = shaderIDs[ material.type ];

                // heuristics to create shader parameters according to lights in the scene
                // (not to blow over maxLights budget)

                const maxBones = object.isSkinnedMesh ? getMaxBones( object ) : 0;

                if ( material.precision !== null ) {

                        precision = capabilities.getMaxPrecision( material.precision );

                        if ( precision !== material.precision ) {

                                console.warn( 'THREE.WebGLProgram.getParameters:', material.precision, 'not supported, using', precision, 'instead.' );

                        }

                }

                let vertexShader, fragmentShader;

                if ( shaderID ) {

                        const shader = ShaderLib[ shaderID ];

                        vertexShader = shader.vertexShader;
                        fragmentShader = shader.fragmentShader;

                } else {

                        vertexShader = material.vertexShader;
                        fragmentShader = material.fragmentShader;

                }

                const currentRenderTarget = renderer.getRenderTarget();

                const parameters = {

                        isWebGL2: isWebGL2,

                        shaderID: shaderID,
                        shaderName: material.type,

                        vertexShader: vertexShader,
                        fragmentShader: fragmentShader,
                        defines: material.defines,

                        isRawShaderMaterial: material.isRawShaderMaterial === true,
                        glslVersion: material.glslVersion,

                        precision: precision,

                        instancing: object.isInstancedMesh === true,
                        instancingColor: object.isInstancedMesh === true && object.instanceColor !== null,

                        supportsVertexTextures: vertexTextures,
                        outputEncoding: ( currentRenderTarget !== null ) ? getTextureEncodingFromMap( currentRenderTarget.texture ) : renderer.outputEncoding,
                        map: !! material.map,
                        mapEncoding: getTextureEncodingFromMap( material.map ),
                        matcap: !! material.matcap,
                        matcapEncoding: getTextureEncodingFromMap( material.matcap ),
                        envMap: !! envMap,
                        envMapMode: envMap && envMap.mapping,
                        envMapEncoding: getTextureEncodingFromMap( envMap ),
                        envMapCubeUV: ( !! envMap ) && ( ( envMap.mapping === CubeUVReflectionMapping ) || ( envMap.mapping === CubeUVRefractionMapping ) ),
                        lightMap: !! material.lightMap,
                        lightMapEncoding: getTextureEncodingFromMap( material.lightMap ),
                        aoMap: !! material.aoMap,
                        emissiveMap: !! material.emissiveMap,
                        emissiveMapEncoding: getTextureEncodingFromMap( material.emissiveMap ),
                        bumpMap: !! material.bumpMap,
                        normalMap: !! material.normalMap,
                        objectSpaceNormalMap: material.normalMapType === ObjectSpaceNormalMap,
                        tangentSpaceNormalMap: material.normalMapType === TangentSpaceNormalMap,
                        clearcoatMap: !! material.clearcoatMap,
                        clearcoatRoughnessMap: !! material.clearcoatRoughnessMap,
                        clearcoatNormalMap: !! material.clearcoatNormalMap,
                        displacementMap: !! material.displacementMap,
                        roughnessMap: !! material.roughnessMap,
                        metalnessMap: !! material.metalnessMap,
                        specularMap: !! material.specularMap,
                        alphaMap: !! material.alphaMap,

                        gradientMap: !! material.gradientMap,

                        sheen: !! material.sheen,

                        transmissionMap: !! material.transmissionMap,

                        combine: material.combine,

                        vertexTangents: ( material.normalMap && material.vertexTangents ),
                        vertexColors: material.vertexColors,
                        vertexUvs: !! material.map || !! material.bumpMap || !! material.normalMap || !! material.specularMap || !! material.alphaMap || !! material.emissiveMap || !! material.roughnessMap || !! material.metalnessMap || !! material.clearcoatMap || !! material.clearcoatRoughnessMap || !! material.clearcoatNormalMap || !! material.displacementMap || !! material.transmissionMap,
                        uvsVertexOnly: ! ( !! material.map || !! material.bumpMap || !! material.normalMap || !! material.specularMap || !! material.alphaMap || !! material.emissiveMap || !! material.roughnessMap || !! material.metalnessMap || !! material.clearcoatNormalMap || !! material.transmissionMap ) && !! material.displacementMap,

                        fog: !! fog,
                        useFog: material.fog,
                        fogExp2: ( fog && fog.isFogExp2 ),

                        flatShading: material.flatShading,

                        sizeAttenuation: material.sizeAttenuation,
                        logarithmicDepthBuffer: logarithmicDepthBuffer,

                        skinning: material.skinning && maxBones > 0,
                        maxBones: maxBones,
                        useVertexTexture: floatVertexTextures,

                        morphTargets: material.morphTargets,
                        morphNormals: material.morphNormals,
                        maxMorphTargets: renderer.maxMorphTargets,
                        maxMorphNormals: renderer.maxMorphNormals,

                        numDirLights: lights.directional.length,
                        numPointLights: lights.point.length,
                        numSpotLights: lights.spot.length,
                        numRectAreaLights: lights.rectArea.length,
                        numHemiLights: lights.hemi.length,

                        numDirLightShadows: lights.directionalShadowMap.length,
                        numPointLightShadows: lights.pointShadowMap.length,
                        numSpotLightShadows: lights.spotShadowMap.length,

                        numClippingPlanes: clipping.numPlanes,
                        numClipIntersection: clipping.numIntersection,

                        dithering: material.dithering,

                        shadowMapEnabled: renderer.shadowMap.enabled && shadows.length > 0,
                        shadowMapType: renderer.shadowMap.type,

                        toneMapping: material.toneMapped ? renderer.toneMapping : NoToneMapping,
                        physicallyCorrectLights: renderer.physicallyCorrectLights,

                        premultipliedAlpha: material.premultipliedAlpha,

                        alphaTest: material.alphaTest,
                        doubleSided: material.side === DoubleSide,
                        flipSided: material.side === BackSide,

                        depthPacking: ( material.depthPacking !== undefined ) ? material.depthPacking : false,

                        index0AttributeName: material.index0AttributeName,

                        extensionDerivatives: material.extensions && material.extensions.derivatives,
                        extensionFragDepth: material.extensions && material.extensions.fragDepth,
                        extensionDrawBuffers: material.extensions && material.extensions.drawBuffers,
                        extensionShaderTextureLOD: material.extensions && material.extensions.shaderTextureLOD,

                        rendererExtensionFragDepth: isWebGL2 || extensions.has( 'EXT_frag_depth' ),
                        rendererExtensionDrawBuffers: isWebGL2 || extensions.has( 'WEBGL_draw_buffers' ),
                        rendererExtensionShaderTextureLod: isWebGL2 || extensions.has( 'EXT_shader_texture_lod' ),

                        customProgramCacheKey: material.customProgramCacheKey()

                };

                return parameters;

        }

        function getProgramCacheKey( parameters ) {

                const array = [];

                if ( parameters.shaderID ) {

                        array.push( parameters.shaderID );

                } else {

                        array.push( parameters.fragmentShader );
                        array.push( parameters.vertexShader );

                }

                if ( parameters.defines !== undefined ) {

                        for ( const name in parameters.defines ) {

                                array.push( name );
                                array.push( parameters.defines[ name ] );

                        }

                }

                if ( parameters.isRawShaderMaterial === false ) {

                        for ( let i = 0; i < parameterNames.length; i ++ ) {

                                array.push( parameters[ parameterNames[ i ] ] );

                        }

                        array.push( renderer.outputEncoding );
                        array.push( renderer.gammaFactor );

                }

                array.push( parameters.customProgramCacheKey );

                return array.join();

        }

        function getUniforms( material ) {

                const shaderID = shaderIDs[ material.type ];
                let uniforms;

                if ( shaderID ) {

                        const shader = ShaderLib[ shaderID ];
                        uniforms = UniformsUtils.clone( shader.uniforms );

                } else {

                        uniforms = material.uniforms;

                }

                return uniforms;

        }

        function acquireProgram( parameters, cacheKey ) {

                let program;

                // Check if code has been already compiled
                for ( let p = 0, pl = programs.length; p < pl; p ++ ) {

                        const preexistingProgram = programs[ p ];

                        if ( preexistingProgram.cacheKey === cacheKey ) {

                                program = preexistingProgram;
                                ++ program.usedTimes;

                                break;

                        }

                }

                if ( program === undefined ) {

                        program = new WebGLProgram( renderer, cacheKey, parameters, bindingStates );
                        programs.push( program );

                }

                return program;

        }

        function releaseProgram( program ) {

                if ( -- program.usedTimes === 0 ) {

                        // Remove from unordered set
                        const i = programs.indexOf( program );
                        programs[ i ] = programs[ programs.length - 1 ];
                        programs.pop();

                        // Free WebGL resources
                        program.destroy();

                }

        }

        return {
                getParameters: getParameters,
                getProgramCacheKey: getProgramCacheKey,
                getUniforms: getUniforms,
                acquireProgram: acquireProgram,
                releaseProgram: releaseProgram,
                // Exposed for resource monitoring & error feedback via renderer.info:
                programs: programs
        };

}

function WebGLProperties() {

        let properties = new WeakMap();

        function get( object ) {

                let map = properties.get( object );

                if ( map === undefined ) {

                        map = {};
                        properties.set( object, map );

                }

                return map;

        }

        function remove( object ) {

                properties.delete( object );

        }

        function update( object, key, value ) {

                properties.get( object )[ key ] = value;

        }

        function dispose() {

                properties = new WeakMap();

        }

        return {
                get: get,
                remove: remove,
                update: update,
                dispose: dispose
        };

}

function painterSortStable( a, b ) {

        if ( a.groupOrder !== b.groupOrder ) {

                return a.groupOrder - b.groupOrder;

        } else if ( a.renderOrder !== b.renderOrder ) {

                return a.renderOrder - b.renderOrder;

        } else if ( a.program !== b.program ) {

                return a.program.id - b.program.id;

        } else if ( a.material.id !== b.material.id ) {

                return a.material.id - b.material.id;

        } else if ( a.z !== b.z ) {

                return a.z - b.z;

        } else {

                return a.id - b.id;

        }

}

function reversePainterSortStable( a, b ) {

        if ( a.groupOrder !== b.groupOrder ) {

                return a.groupOrder - b.groupOrder;

        } else if ( a.renderOrder !== b.renderOrder ) {

                return a.renderOrder - b.renderOrder;

        } else if ( a.z !== b.z ) {

                return b.z - a.z;

        } else {

                return a.id - b.id;

        }

}


function WebGLRenderList( properties ) {

        const renderItems = [];
        let renderItemsIndex = 0;

        const opaque = [];
        const transparent = [];

        const defaultProgram = { id: - 1 };

        function init() {

                renderItemsIndex = 0;

                opaque.length = 0;
                transparent.length = 0;

        }

        function getNextRenderItem( object, geometry, material, groupOrder, z, group ) {

                let renderItem = renderItems[ renderItemsIndex ];
                const materialProperties = properties.get( material );

                if ( renderItem === undefined ) {

                        renderItem = {
                                id: object.id,
                                object: object,
                                geometry: geometry,
                                material: material,
                                program: materialProperties.program || defaultProgram,
                                groupOrder: groupOrder,
                                renderOrder: object.renderOrder,
                                z: z,
                                group: group
                        };

                        renderItems[ renderItemsIndex ] = renderItem;

                } else {

                        renderItem.id = object.id;
                        renderItem.object = object;
                        renderItem.geometry = geometry;
                        renderItem.material = material;
                        renderItem.program = materialProperties.program || defaultProgram;
                        renderItem.groupOrder = groupOrder;
                        renderItem.renderOrder = object.renderOrder;
                        renderItem.z = z;
                        renderItem.group = group;

                }

                renderItemsIndex ++;

                return renderItem;

        }

        function push( object, geometry, material, groupOrder, z, group ) {

                const renderItem = getNextRenderItem( object, geometry, material, groupOrder, z, group );

                ( material.transparent === true ? transparent : opaque ).push( renderItem );

        }

        function unshift( object, geometry, material, groupOrder, z, group ) {

                const renderItem = getNextRenderItem( object, geometry, material, groupOrder, z, group );

                ( material.transparent === true ? transparent : opaque ).unshift( renderItem );

        }

        function sort( customOpaqueSort, customTransparentSort ) {

                if ( opaque.length > 1 ) opaque.sort( customOpaqueSort || painterSortStable );
                if ( transparent.length > 1 ) transparent.sort( customTransparentSort || reversePainterSortStable );

        }

        function finish() {

                // Clear references from inactive renderItems in the list

                for ( let i = renderItemsIndex, il = renderItems.length; i < il; i ++ ) {

                        const renderItem = renderItems[ i ];

                        if ( renderItem.id === null ) break;

                        renderItem.id = null;
                        renderItem.object = null;
                        renderItem.geometry = null;
                        renderItem.material = null;
                        renderItem.program = null;
                        renderItem.group = null;

                }

        }

        return {

                opaque: opaque,
                transparent: transparent,

                init: init,
                push: push,
                unshift: unshift,
                finish: finish,

                sort: sort
        };

}

function WebGLRenderLists( properties ) {

        let lists = new WeakMap();

        function get( scene, camera ) {

                const cameras = lists.get( scene );
                let list;

                if ( cameras === undefined ) {

                        list = new WebGLRenderList( properties );
                        lists.set( scene, new WeakMap() );
                        lists.get( scene ).set( camera, list );

                } else {

                        list = cameras.get( camera );
                        if ( list === undefined ) {

                                list = new WebGLRenderList( properties );
                                cameras.set( camera, list );

                        }

                }

                return list;

        }

        function dispose() {

                lists = new WeakMap();

        }

        return {
                get: get,
                dispose: dispose
        };

}

function UniformsCache() {

        const lights = {};

        return {

                get: function ( light ) {

                        if ( lights[ light.id ] !== undefined ) {

                                return lights[ light.id ];

                        }

                        let uniforms;

                        switch ( light.type ) {

                                case 'DirectionalLight':
                                        uniforms = {
                                                direction: new Vector3(),
                                                color: new Color()
                                        };
                                        break;

                                case 'SpotLight':
                                        uniforms = {
                                                position: new Vector3(),
                                                direction: new Vector3(),
                                                color: new Color(),
                                                distance: 0,
                                                coneCos: 0,
                                                penumbraCos: 0,
                                                decay: 0
                                        };
                                        break;

                                case 'PointLight':
                                        uniforms = {
                                                position: new Vector3(),
                                                color: new Color(),
                                                distance: 0,
                                                decay: 0
                                        };
                                        break;

                                case 'HemisphereLight':
                                        uniforms = {
                                                direction: new Vector3(),
                                                skyColor: new Color(),
                                                groundColor: new Color()
                                        };
                                        break;

                                case 'RectAreaLight':
                                        uniforms = {
                                                color: new Color(),
                                                position: new Vector3(),
                                                halfWidth: new Vector3(),
                                                halfHeight: new Vector3()
                                        };
                                        break;

                        }

                        lights[ light.id ] = uniforms;

                        return uniforms;

                }

        };

}

function ShadowUniformsCache() {

        const lights = {};

        return {

                get: function ( light ) {

                        if ( lights[ light.id ] !== undefined ) {

                                return lights[ light.id ];

                        }

                        let uniforms;

                        switch ( light.type ) {

                                case 'DirectionalLight':
                                        uniforms = {
                                                shadowBias: 0,
                                                shadowNormalBias: 0,
                                                shadowRadius: 1,
                                                shadowMapSize: new Vector2()
                                        };
                                        break;

                                case 'SpotLight':
                                        uniforms = {
                                                shadowBias: 0,
                                                shadowNormalBias: 0,
                                                shadowRadius: 1,
                                                shadowMapSize: new Vector2()
                                        };
                                        break;

                                case 'PointLight':
                                        uniforms = {
                                                shadowBias: 0,
                                                shadowNormalBias: 0,
                                                shadowRadius: 1,
                                                shadowMapSize: new Vector2(),
                                                shadowCameraNear: 1,
                                                shadowCameraFar: 1000
                                        };
                                        break;

                                // TODO (abelnation): set RectAreaLight shadow uniforms

                        }

                        lights[ light.id ] = uniforms;

                        return uniforms;

                }

        };

}



let nextVersion = 0;

function shadowCastingLightsFirst( lightA, lightB ) {

        return ( lightB.castShadow ? 1 : 0 ) - ( lightA.castShadow ? 1 : 0 );

}

function WebGLLights( extensions, capabilities ) {

        const cache = new UniformsCache();

        const shadowCache = ShadowUniformsCache();

        const state = {

                version: 0,

                hash: {
                        directionalLength: - 1,
                        pointLength: - 1,
                        spotLength: - 1,
                        rectAreaLength: - 1,
                        hemiLength: - 1,

                        numDirectionalShadows: - 1,
                        numPointShadows: - 1,
                        numSpotShadows: - 1
                },

                ambient: [ 0, 0, 0 ],
                probe: [],
                directional: [],
                directionalShadow: [],
                directionalShadowMap: [],
                directionalShadowMatrix: [],
                spot: [],
                spotShadow: [],
                spotShadowMap: [],
                spotShadowMatrix: [],
                rectArea: [],
                rectAreaLTC1: null,
                rectAreaLTC2: null,
                point: [],
                pointShadow: [],
                pointShadowMap: [],
                pointShadowMatrix: [],
                hemi: []

        };

        for ( let i = 0; i < 9; i ++ ) state.probe.push( new Vector3() );

        const vector3 = new Vector3();
        const matrix4 = new Matrix4();
        const matrix42 = new Matrix4();

        function setup( lights, shadows, camera ) {

                let r = 0, g = 0, b = 0;

                for ( let i = 0; i < 9; i ++ ) state.probe[ i ].set( 0, 0, 0 );

                let directionalLength = 0;
                let pointLength = 0;
                let spotLength = 0;
                let rectAreaLength = 0;
                let hemiLength = 0;

                let numDirectionalShadows = 0;
                let numPointShadows = 0;
                let numSpotShadows = 0;

                const viewMatrix = camera.matrixWorldInverse;

                lights.sort( shadowCastingLightsFirst );

                for ( let i = 0, l = lights.length; i < l; i ++ ) {

                        const light = lights[ i ];

                        const color = light.color;
                        const intensity = light.intensity;
                        const distance = light.distance;

                        const shadowMap = ( light.shadow && light.shadow.map ) ? light.shadow.map.texture : null;

                        if ( light.isAmbientLight ) {

                                r += color.r * intensity;
                                g += color.g * intensity;
                                b += color.b * intensity;

                        } else if ( light.isLightProbe ) {

                                for ( let j = 0; j < 9; j ++ ) {

                                        state.probe[ j ].addScaledVector( light.sh.coefficients[ j ], intensity );

                                }

                        } else if ( light.isDirectionalLight ) {

                                const uniforms = cache.get( light );

                                uniforms.color.copy( light.color ).multiplyScalar( light.intensity );
                                uniforms.direction.setFromMatrixPosition( light.matrixWorld );
                                vector3.setFromMatrixPosition( light.target.matrixWorld );
                                uniforms.direction.sub( vector3 );
                                uniforms.direction.transformDirection( viewMatrix );

                                if ( light.castShadow ) {

                                        const shadow = light.shadow;

                                        const shadowUniforms = shadowCache.get( light );

                                        shadowUniforms.shadowBias = shadow.bias;
                                        shadowUniforms.shadowNormalBias = shadow.normalBias;
                                        shadowUniforms.shadowRadius = shadow.radius;
                                        shadowUniforms.shadowMapSize = shadow.mapSize;

                                        state.directionalShadow[ directionalLength ] = shadowUniforms;
                                        state.directionalShadowMap[ directionalLength ] = shadowMap;
                                        state.directionalShadowMatrix[ directionalLength ] = light.shadow.matrix;

                                        numDirectionalShadows ++;

                                }

                                state.directional[ directionalLength ] = uniforms;

                                directionalLength ++;

                        } else if ( light.isSpotLight ) {

                                const uniforms = cache.get( light );

                                uniforms.position.setFromMatrixPosition( light.matrixWorld );
                                uniforms.position.applyMatrix4( viewMatrix );

                                uniforms.color.copy( color ).multiplyScalar( intensity );
                                uniforms.distance = distance;

                                uniforms.direction.setFromMatrixPosition( light.matrixWorld );
                                vector3.setFromMatrixPosition( light.target.matrixWorld );
                                uniforms.direction.sub( vector3 );
                                uniforms.direction.transformDirection( viewMatrix );

                                uniforms.coneCos = Math.cos( light.angle );
                                uniforms.penumbraCos = Math.cos( light.angle * ( 1 - light.penumbra ) );
                                uniforms.decay = light.decay;

                                if ( light.castShadow ) {

                                        const shadow = light.shadow;

                                        const shadowUniforms = shadowCache.get( light );

                                        shadowUniforms.shadowBias = shadow.bias;
                                        shadowUniforms.shadowNormalBias = shadow.normalBias;
                                        shadowUniforms.shadowRadius = shadow.radius;
                                        shadowUniforms.shadowMapSize = shadow.mapSize;

                                        state.spotShadow[ spotLength ] = shadowUniforms;
                                        state.spotShadowMap[ spotLength ] = shadowMap;
                                        state.spotShadowMatrix[ spotLength ] = light.shadow.matrix;

                                        numSpotShadows ++;

                                }

                                state.spot[ spotLength ] = uniforms;

                                spotLength ++;

                        } else if ( light.isRectAreaLight ) {

                                const uniforms = cache.get( light );

                                // (a) intensity is the total visible light emitted
                                //uniforms.color.copy( color ).multiplyScalar( intensity / ( light.width * light.height * Math.PI ) );

                                // (b) intensity is the brightness of the light
                                uniforms.color.copy( color ).multiplyScalar( intensity );

                                uniforms.position.setFromMatrixPosition( light.matrixWorld );
                                uniforms.position.applyMatrix4( viewMatrix );

                                // extract local rotation of light to derive width/height half vectors
                                matrix42.identity();
                                matrix4.copy( light.matrixWorld );
                                matrix4.premultiply( viewMatrix );
                                matrix42.extractRotation( matrix4 );

                                uniforms.halfWidth.set( light.width * 0.5, 0.0, 0.0 );
                                uniforms.halfHeight.set( 0.0, light.height * 0.5, 0.0 );

                                uniforms.halfWidth.applyMatrix4( matrix42 );
                                uniforms.halfHeight.applyMatrix4( matrix42 );

                                // TODO (abelnation): RectAreaLight distance?
                                // uniforms.distance = distance;

                                state.rectArea[ rectAreaLength ] = uniforms;

                                rectAreaLength ++;

                        } else if ( light.isPointLight ) {

                                const uniforms = cache.get( light );

                                uniforms.position.setFromMatrixPosition( light.matrixWorld );
                                uniforms.position.applyMatrix4( viewMatrix );

                                uniforms.color.copy( light.color ).multiplyScalar( light.intensity );
                                uniforms.distance = light.distance;
                                uniforms.decay = light.decay;

                                if ( light.castShadow ) {

                                        const shadow = light.shadow;

                                        const shadowUniforms = shadowCache.get( light );

                                        shadowUniforms.shadowBias = shadow.bias;
                                        shadowUniforms.shadowNormalBias = shadow.normalBias;
                                        shadowUniforms.shadowRadius = shadow.radius;
                                        shadowUniforms.shadowMapSize = shadow.mapSize;
                                        shadowUniforms.shadowCameraNear = shadow.camera.near;
                                        shadowUniforms.shadowCameraFar = shadow.camera.far;

                                        state.pointShadow[ pointLength ] = shadowUniforms;
                                        state.pointShadowMap[ pointLength ] = shadowMap;
                                        state.pointShadowMatrix[ pointLength ] = light.shadow.matrix;

                                        numPointShadows ++;

                                }

                                state.point[ pointLength ] = uniforms;

                                pointLength ++;

                        } else if ( light.isHemisphereLight ) {

                                const uniforms = cache.get( light );

                                uniforms.direction.setFromMatrixPosition( light.matrixWorld );
                                uniforms.direction.transformDirection( viewMatrix );
                                uniforms.direction.normalize();

                                uniforms.skyColor.copy( light.color ).multiplyScalar( intensity );
                                uniforms.groundColor.copy( light.groundColor ).multiplyScalar( intensity );

                                state.hemi[ hemiLength ] = uniforms;

                                hemiLength ++;

                        }

                }

                if ( rectAreaLength > 0 ) {

                        if ( capabilities.isWebGL2 ) {

                                // WebGL 2

                                state.rectAreaLTC1 = UniformsLib.LTC_FLOAT_1;
                                state.rectAreaLTC2 = UniformsLib.LTC_FLOAT_2;

                        } else {

                                // WebGL 1

                                if ( extensions.has( 'OES_texture_float_linear' ) === true ) {

                                        state.rectAreaLTC1 = UniformsLib.LTC_FLOAT_1;
                                        state.rectAreaLTC2 = UniformsLib.LTC_FLOAT_2;

                                } else if ( extensions.has( 'OES_texture_half_float_linear' ) === true ) {

                                        state.rectAreaLTC1 = UniformsLib.LTC_HALF_1;
                                        state.rectAreaLTC2 = UniformsLib.LTC_HALF_2;

                                } else {

                                        console.error( 'THREE.WebGLRenderer: Unable to use RectAreaLight. Missing WebGL extensions.' );

                                }

                        }

                }

                state.ambient[ 0 ] = r;
                state.ambient[ 1 ] = g;
                state.ambient[ 2 ] = b;

                const hash = state.hash;

                if ( hash.directionalLength !== directionalLength ||
                        hash.pointLength !== pointLength ||
                        hash.spotLength !== spotLength ||
                        hash.rectAreaLength !== rectAreaLength ||
                        hash.hemiLength !== hemiLength ||
                        hash.numDirectionalShadows !== numDirectionalShadows ||
                        hash.numPointShadows !== numPointShadows ||
                        hash.numSpotShadows !== numSpotShadows ) {

                        state.directional.length = directionalLength;
                        state.spot.length = spotLength;
                        state.rectArea.length = rectAreaLength;
                        state.point.length = pointLength;
                        state.hemi.length = hemiLength;

                        state.directionalShadow.length = numDirectionalShadows;
                        state.directionalShadowMap.length = numDirectionalShadows;
                        state.pointShadow.length = numPointShadows;
                        state.pointShadowMap.length = numPointShadows;
                        state.spotShadow.length = numSpotShadows;
                        state.spotShadowMap.length = numSpotShadows;
                        state.directionalShadowMatrix.length = numDirectionalShadows;
                        state.pointShadowMatrix.length = numPointShadows;
                        state.spotShadowMatrix.length = numSpotShadows;

                        hash.directionalLength = directionalLength;
                        hash.pointLength = pointLength;
                        hash.spotLength = spotLength;
                        hash.rectAreaLength = rectAreaLength;
                        hash.hemiLength = hemiLength;

                        hash.numDirectionalShadows = numDirectionalShadows;
                        hash.numPointShadows = numPointShadows;
                        hash.numSpotShadows = numSpotShadows;

                        state.version = nextVersion ++;

                }

        }

        return {
                setup: setup,
                state: state
        };

}

function WebGLRenderState( extensions, capabilities ) {

        const lights = new WebGLLights( extensions, capabilities );

        const lightsArray = [];
        const shadowsArray = [];

        function init() {

                lightsArray.length = 0;
                shadowsArray.length = 0;

        }

        function pushLight( light ) {

                lightsArray.push( light );

        }

        function pushShadow( shadowLight ) {

                shadowsArray.push( shadowLight );

        }

        function setupLights( camera ) {

                lights.setup( lightsArray, shadowsArray, camera );

        }

        const state = {
                lightsArray: lightsArray,
                shadowsArray: shadowsArray,

                lights: lights
        };

        return {
                init: init,
                state: state,
                setupLights: setupLights,

                pushLight: pushLight,
                pushShadow: pushShadow
        };

}

function WebGLRenderStates( extensions, capabilities ) {

        let renderStates = new WeakMap();

        function get( scene, camera ) {

                let renderState;

                if ( renderStates.has( scene ) === false ) {

                        renderState = new WebGLRenderState( extensions, capabilities );
                        renderStates.set( scene, new WeakMap() );
                        renderStates.get( scene ).set( camera, renderState );

                } else {

                        if ( renderStates.get( scene ).has( camera ) === false ) {

                                renderState = new WebGLRenderState( extensions, capabilities );
                                renderStates.get( scene ).set( camera, renderState );

                        } else {

                                renderState = renderStates.get( scene ).get( camera );

                        }

                }

                return renderState;

        }

        function dispose() {

                renderStates = new WeakMap();

        }

        return {
                get: get,
                dispose: dispose
        };

}

/**
 * parameters = {
 *
 *  opacity: <float>,
 *
 *  map: new THREE.Texture( <Image> ),
 *
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  displacementMap: new THREE.Texture( <Image> ),
 *  displacementScale: <float>,
 *  displacementBias: <float>,
 *
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>
 * }
 */

function MeshDepthMaterial( parameters ) {

        Material.call( this );

        this.type = 'MeshDepthMaterial';

        this.depthPacking = BasicDepthPacking;

        this.skinning = false;
        this.morphTargets = false;

        this.map = null;

        this.alphaMap = null;

        this.displacementMap = null;
        this.displacementScale = 1;
        this.displacementBias = 0;

        this.wireframe = false;
        this.wireframeLinewidth = 1;

        this.fog = false;

        this.setValues( parameters );

}

MeshDepthMaterial.prototype = Object.create( Material.prototype );
MeshDepthMaterial.prototype.constructor = MeshDepthMaterial;

MeshDepthMaterial.prototype.isMeshDepthMaterial = true;

MeshDepthMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.depthPacking = source.depthPacking;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;

        this.map = source.map;

        this.alphaMap = source.alphaMap;

        this.displacementMap = source.displacementMap;
        this.displacementScale = source.displacementScale;
        this.displacementBias = source.displacementBias;

        this.wireframe = source.wireframe;
        this.wireframeLinewidth = source.wireframeLinewidth;

        return this;

};

/**
 * parameters = {
 *
 *  referencePosition: <float>,
 *  nearDistance: <float>,
 *  farDistance: <float>,
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>,
 *
 *  map: new THREE.Texture( <Image> ),
 *
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  displacementMap: new THREE.Texture( <Image> ),
 *  displacementScale: <float>,
 *  displacementBias: <float>
 *
 * }
 */

function MeshDistanceMaterial( parameters ) {

        Material.call( this );

        this.type = 'MeshDistanceMaterial';

        this.referencePosition = new Vector3();
        this.nearDistance = 1;
        this.farDistance = 1000;

        this.skinning = false;
        this.morphTargets = false;

        this.map = null;

        this.alphaMap = null;

        this.displacementMap = null;
        this.displacementScale = 1;
        this.displacementBias = 0;

        this.fog = false;

        this.setValues( parameters );

}

MeshDistanceMaterial.prototype = Object.create( Material.prototype );
MeshDistanceMaterial.prototype.constructor = MeshDistanceMaterial;

MeshDistanceMaterial.prototype.isMeshDistanceMaterial = true;

MeshDistanceMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.referencePosition.copy( source.referencePosition );
        this.nearDistance = source.nearDistance;
        this.farDistance = source.farDistance;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;

        this.map = source.map;

        this.alphaMap = source.alphaMap;

        this.displacementMap = source.displacementMap;
        this.displacementScale = source.displacementScale;
        this.displacementBias = source.displacementBias;

        return this;

};

var vsm_frag = "uniform sampler2D shadow_pass;\nuniform vec2 resolution;\nuniform float radius;\n#include <packing>\nvoid main() {\n\tfloat mean = 0.0;\n\tfloat squared_mean = 0.0;\n\tfloat depth = unpackRGBAToDepth( texture2D( shadow_pass, ( gl_FragCoord.xy ) / resolution ) );\n\tfor ( float i = -1.0; i < 1.0 ; i += SAMPLE_RATE) {\n\t\t#ifdef HORIZONAL_PASS\n\t\t\tvec2 distribution = unpackRGBATo2Half( texture2D( shadow_pass, ( gl_FragCoord.xy + vec2( i, 0.0 ) * radius ) / resolution ) );\n\t\t\tmean += distribution.x;\n\t\t\tsquared_mean += distribution.y * distribution.y + distribution.x * distribution.x;\n\t\t#else\n\t\t\tfloat depth = unpackRGBAToDepth( texture2D( shadow_pass, ( gl_FragCoord.xy + vec2( 0.0, i ) * radius ) / resolution ) );\n\t\t\tmean += depth;\n\t\t\tsquared_mean += depth * depth;\n\t\t#endif\n\t}\n\tmean = mean * HALF_SAMPLE_RATE;\n\tsquared_mean = squared_mean * HALF_SAMPLE_RATE;\n\tfloat std_dev = sqrt( squared_mean - mean * mean );\n\tgl_FragColor = pack2HalfToRGBA( vec2( mean, std_dev ) );\n}";

var vsm_vert = "void main() {\n\tgl_Position = vec4( position, 1.0 );\n}";

function WebGLShadowMap( _renderer, _objects, maxTextureSize ) {

        let _frustum = new Frustum();

        const _shadowMapSize = new Vector2(),
                _viewportSize = new Vector2(),

                _viewport = new Vector4(),

                _depthMaterials = [],
                _distanceMaterials = [],

                _materialCache = {};

        const shadowSide = { 0: BackSide, 1: FrontSide, 2: DoubleSide };

        const shadowMaterialVertical = new ShaderMaterial( {

                defines: {
                        SAMPLE_RATE: 2.0 / 8.0,
                        HALF_SAMPLE_RATE: 1.0 / 8.0
                },

                uniforms: {
                        shadow_pass: { value: null },
                        resolution: { value: new Vector2() },
                        radius: { value: 4.0 }
                },

                vertexShader: vsm_vert,

                fragmentShader: vsm_frag

        } );

        const shadowMaterialHorizonal = shadowMaterialVertical.clone();
        shadowMaterialHorizonal.defines.HORIZONAL_PASS = 1;

        const fullScreenTri = new BufferGeometry();
        fullScreenTri.setAttribute(
                "position",
                new BufferAttribute(
                        new Float32Array( [ - 1, - 1, 0.5, 3, - 1, 0.5, - 1, 3, 0.5 ] ),
                        3
                )
        );

        const fullScreenMesh = new Mesh( fullScreenTri, shadowMaterialVertical );

        const scope = this;

        this.enabled = false;

        this.autoUpdate = true;
        this.needsUpdate = false;

        this.type = PCFShadowMap;

        this.render = function ( lights, scene, camera ) {

                if ( scope.enabled === false ) return;
                if ( scope.autoUpdate === false && scope.needsUpdate === false ) return;

                if ( lights.length === 0 ) return;

                const currentRenderTarget = _renderer.getRenderTarget();
                const activeCubeFace = _renderer.getActiveCubeFace();
                const activeMipmapLevel = _renderer.getActiveMipmapLevel();

                const _state = _renderer.state;

                // Set GL state for depth map.
                _state.setBlending( NoBlending );
                _state.buffers.color.setClear( 1, 1, 1, 1 );
                _state.buffers.depth.setTest( true );
                _state.setScissorTest( false );

                // render depth map

                for ( let i = 0, il = lights.length; i < il; i ++ ) {

                        const light = lights[ i ];
                        const shadow = light.shadow;

                        if ( shadow === undefined ) {

                                console.warn( 'THREE.WebGLShadowMap:', light, 'has no shadow.' );
                                continue;

                        }

                        if ( shadow.autoUpdate === false && shadow.needsUpdate === false ) continue;

                        _shadowMapSize.copy( shadow.mapSize );

                        const shadowFrameExtents = shadow.getFrameExtents();

                        _shadowMapSize.multiply( shadowFrameExtents );

                        _viewportSize.copy( shadow.mapSize );

                        if ( _shadowMapSize.x > maxTextureSize || _shadowMapSize.y > maxTextureSize ) {

                                if ( _shadowMapSize.x > maxTextureSize ) {

                                        _viewportSize.x = Math.floor( maxTextureSize / shadowFrameExtents.x );
                                        _shadowMapSize.x = _viewportSize.x * shadowFrameExtents.x;
                                        shadow.mapSize.x = _viewportSize.x;

                                }

                                if ( _shadowMapSize.y > maxTextureSize ) {

                                        _viewportSize.y = Math.floor( maxTextureSize / shadowFrameExtents.y );
                                        _shadowMapSize.y = _viewportSize.y * shadowFrameExtents.y;
                                        shadow.mapSize.y = _viewportSize.y;

                                }

                        }

                        if ( shadow.map === null && ! shadow.isPointLightShadow && this.type === VSMShadowMap ) {

                                const pars = { minFilter: LinearFilter, magFilter: LinearFilter, format: RGBAFormat };

                                shadow.map = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );
                                shadow.map.texture.name = light.name + ".shadowMap";

                                shadow.mapPass = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );

                                shadow.camera.updateProjectionMatrix();

                        }

                        if ( shadow.map === null ) {

                                const pars = { minFilter: NearestFilter, magFilter: NearestFilter, format: RGBAFormat };

                                shadow.map = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );
                                shadow.map.texture.name = light.name + ".shadowMap";

                                shadow.camera.updateProjectionMatrix();

                        }

                        _renderer.setRenderTarget( shadow.map );
                        _renderer.clear();

                        const viewportCount = shadow.getViewportCount();

                        for ( let vp = 0; vp < viewportCount; vp ++ ) {

                                const viewport = shadow.getViewport( vp );

                                _viewport.set(
                                        _viewportSize.x * viewport.x,
                                        _viewportSize.y * viewport.y,
                                        _viewportSize.x * viewport.z,
                                        _viewportSize.y * viewport.w
                                );

                                _state.viewport( _viewport );

                                shadow.updateMatrices( light, vp );

                                _frustum = shadow.getFrustum();

                                renderObject( scene, camera, shadow.camera, light, this.type );

                        }

                        // do blur pass for VSM

                        if ( ! shadow.isPointLightShadow && this.type === VSMShadowMap ) {

                                VSMPass( shadow, camera );

                        }

                        shadow.needsUpdate = false;

                }

                scope.needsUpdate = false;

                _renderer.setRenderTarget( currentRenderTarget, activeCubeFace, activeMipmapLevel );

        };

        function VSMPass( shadow, camera ) {

                const geometry = _objects.update( fullScreenMesh );

                // vertical pass

                shadowMaterialVertical.uniforms.shadow_pass.value = shadow.map.texture;
                shadowMaterialVertical.uniforms.resolution.value = shadow.mapSize;
                shadowMaterialVertical.uniforms.radius.value = shadow.radius;
                _renderer.setRenderTarget( shadow.mapPass );
                _renderer.clear();
                _renderer.renderBufferDirect( camera, null, geometry, shadowMaterialVertical, fullScreenMesh, null );

                // horizonal pass

                shadowMaterialHorizonal.uniforms.shadow_pass.value = shadow.mapPass.texture;
                shadowMaterialHorizonal.uniforms.resolution.value = shadow.mapSize;
                shadowMaterialHorizonal.uniforms.radius.value = shadow.radius;
                _renderer.setRenderTarget( shadow.map );
                _renderer.clear();
                _renderer.renderBufferDirect( camera, null, geometry, shadowMaterialHorizonal, fullScreenMesh, null );

        }

        function getDepthMaterialVariant( useMorphing, useSkinning, useInstancing ) {

                const index = useMorphing << 0 | useSkinning << 1 | useInstancing << 2;

                let material = _depthMaterials[ index ];

                if ( material === undefined ) {

                        material = new MeshDepthMaterial( {

                                depthPacking: RGBADepthPacking,

                                morphTargets: useMorphing,
                                skinning: useSkinning

                        } );

                        _depthMaterials[ index ] = material;

                }

                return material;

        }

        function getDistanceMaterialVariant( useMorphing, useSkinning, useInstancing ) {

                const index = useMorphing << 0 | useSkinning << 1 | useInstancing << 2;

                let material = _distanceMaterials[ index ];

                if ( material === undefined ) {

                        material = new MeshDistanceMaterial( {

                                morphTargets: useMorphing,
                                skinning: useSkinning

                        } );

                        _distanceMaterials[ index ] = material;

                }

                return material;

        }

        function getDepthMaterial( object, geometry, material, light, shadowCameraNear, shadowCameraFar, type ) {

                let result = null;

                let getMaterialVariant = getDepthMaterialVariant;
                let customMaterial = object.customDepthMaterial;

                if ( light.isPointLight === true ) {

                        getMaterialVariant = getDistanceMaterialVariant;
                        customMaterial = object.customDistanceMaterial;

                }

                if ( customMaterial === undefined ) {

                        let useMorphing = false;

                        if ( material.morphTargets === true ) {

                                useMorphing = geometry.morphAttributes && geometry.morphAttributes.position && geometry.morphAttributes.position.length > 0;

                        }

                        let useSkinning = false;

                        if ( object.isSkinnedMesh === true ) {

                                if ( material.skinning === true ) {

                                        useSkinning = true;

                                } else {

                                        console.warn( 'THREE.WebGLShadowMap: THREE.SkinnedMesh with material.skinning set to false:', object );

                                }

                        }

                        const useInstancing = object.isInstancedMesh === true;

                        result = getMaterialVariant( useMorphing, useSkinning, useInstancing );

                } else {

                        result = customMaterial;

                }

                if ( _renderer.localClippingEnabled &&
                                material.clipShadows === true &&
                                material.clippingPlanes.length !== 0 ) {

                        // in this case we need a unique material instance reflecting the
                        // appropriate state

                        const keyA = result.uuid, keyB = material.uuid;

                        let materialsForVariant = _materialCache[ keyA ];

                        if ( materialsForVariant === undefined ) {

                                materialsForVariant = {};
                                _materialCache[ keyA ] = materialsForVariant;

                        }

                        let cachedMaterial = materialsForVariant[ keyB ];

                        if ( cachedMaterial === undefined ) {

                                cachedMaterial = result.clone();
                                materialsForVariant[ keyB ] = cachedMaterial;

                        }

                        result = cachedMaterial;

                }

                result.visible = material.visible;
                result.wireframe = material.wireframe;

                if ( type === VSMShadowMap ) {

                        result.side = ( material.shadowSide !== null ) ? material.shadowSide : material.side;

                } else {

                        result.side = ( material.shadowSide !== null ) ? material.shadowSide : shadowSide[ material.side ];

                }

                result.clipShadows = material.clipShadows;
                result.clippingPlanes = material.clippingPlanes;
                result.clipIntersection = material.clipIntersection;

                result.wireframeLinewidth = material.wireframeLinewidth;
                result.linewidth = material.linewidth;

                if ( light.isPointLight === true && result.isMeshDistanceMaterial === true ) {

                        result.referencePosition.setFromMatrixPosition( light.matrixWorld );
                        result.nearDistance = shadowCameraNear;
                        result.farDistance = shadowCameraFar;

                }

                return result;

        }

        function renderObject( object, camera, shadowCamera, light, type ) {

                if ( object.visible === false ) return;

                const visible = object.layers.test( camera.layers );

                if ( visible && ( object.isMesh || object.isLine || object.isPoints ) ) {

                        if ( ( object.castShadow || ( object.receiveShadow && type === VSMShadowMap ) ) && ( ! object.frustumCulled || _frustum.intersectsObject( object ) ) ) {

                                object.modelViewMatrix.multiplyMatrices( shadowCamera.matrixWorldInverse, object.matrixWorld );

                                const geometry = _objects.update( object );
                                const material = object.material;

                                if ( Array.isArray( material ) ) {

                                        const groups = geometry.groups;

                                        for ( let k = 0, kl = groups.length; k < kl; k ++ ) {

                                                const group = groups[ k ];
                                                const groupMaterial = material[ group.materialIndex ];

                                                if ( groupMaterial && groupMaterial.visible ) {

                                                        const depthMaterial = getDepthMaterial( object, geometry, groupMaterial, light, shadowCamera.near, shadowCamera.far, type );

                                                        _renderer.renderBufferDirect( shadowCamera, null, geometry, depthMaterial, object, group );

                                                }

                                        }

                                } else if ( material.visible ) {

                                        const depthMaterial = getDepthMaterial( object, geometry, material, light, shadowCamera.near, shadowCamera.far, type );

                                        _renderer.renderBufferDirect( shadowCamera, null, geometry, depthMaterial, object, null );

                                }

                        }

                }

                const children = object.children;

                for ( let i = 0, l = children.length; i < l; i ++ ) {

                        renderObject( children[ i ], camera, shadowCamera, light, type );

                }

        }

}

function WebGLState( gl, extensions, capabilities ) {

        const isWebGL2 = capabilities.isWebGL2;

        function ColorBuffer() {

                let locked = false;

                const color = new Vector4();
                let currentColorMask = null;
                const currentColorClear = new Vector4( 0, 0, 0, 0 );

                return {

                        setMask: function ( colorMask ) {

                                if ( currentColorMask !== colorMask && ! locked ) {

                                        gl.colorMask( colorMask, colorMask, colorMask, colorMask );
                                        currentColorMask = colorMask;

                                }

                        },

                        setLocked: function ( lock ) {

                                locked = lock;

                        },

                        setClear: function ( r, g, b, a, premultipliedAlpha ) {

                                if ( premultipliedAlpha === true ) {

                                        r *= a; g *= a; b *= a;

                                }

                                color.set( r, g, b, a );

                                if ( currentColorClear.equals( color ) === false ) {

                                        gl.clearColor( r, g, b, a );
                                        currentColorClear.copy( color );

                                }

                        },

                        reset: function () {

                                locked = false;

                                currentColorMask = null;
                                currentColorClear.set( - 1, 0, 0, 0 ); // set to invalid state

                        }

                };

        }

        function DepthBuffer() {

                let locked = false;

                let currentDepthMask = null;
                let currentDepthFunc = null;
                let currentDepthClear = null;

                return {

                        setTest: function ( depthTest ) {

                                if ( depthTest ) {

                                        enable( 2929 );

                                } else {

                                        disable( 2929 );

                                }

                        },

                        setMask: function ( depthMask ) {

                                if ( currentDepthMask !== depthMask && ! locked ) {

                                        gl.depthMask( depthMask );
                                        currentDepthMask = depthMask;

                                }

                        },

                        setFunc: function ( depthFunc ) {

                                if ( currentDepthFunc !== depthFunc ) {

                                        if ( depthFunc ) {

                                                switch ( depthFunc ) {

                                                        case NeverDepth:

                                                                gl.depthFunc( 512 );
                                                                break;

                                                        case AlwaysDepth:

                                                                gl.depthFunc( 519 );
                                                                break;

                                                        case LessDepth:

                                                                gl.depthFunc( 513 );
                                                                break;

                                                        case LessEqualDepth:

                                                                gl.depthFunc( 515 );
                                                                break;

                                                        case EqualDepth:

                                                                gl.depthFunc( 514 );
                                                                break;

                                                        case GreaterEqualDepth:

                                                                gl.depthFunc( 518 );
                                                                break;

                                                        case GreaterDepth:

                                                                gl.depthFunc( 516 );
                                                                break;

                                                        case NotEqualDepth:

                                                                gl.depthFunc( 517 );
                                                                break;

                                                        default:

                                                                gl.depthFunc( 515 );

                                                }

                                        } else {

                                                gl.depthFunc( 515 );

                                        }

                                        currentDepthFunc = depthFunc;

                                }

                        },

                        setLocked: function ( lock ) {

                                locked = lock;

                        },

                        setClear: function ( depth ) {

                                if ( currentDepthClear !== depth ) {

                                        gl.clearDepth( depth );
                                        currentDepthClear = depth;

                                }

                        },

                        reset: function () {

                                locked = false;

                                currentDepthMask = null;
                                currentDepthFunc = null;
                                currentDepthClear = null;

                        }

                };

        }

        function StencilBuffer() {

                let locked = false;

                let currentStencilMask = null;
                let currentStencilFunc = null;
                let currentStencilRef = null;
                let currentStencilFuncMask = null;
                let currentStencilFail = null;
                let currentStencilZFail = null;
                let currentStencilZPass = null;
                let currentStencilClear = null;

                return {

                        setTest: function ( stencilTest ) {

                                if ( ! locked ) {

                                        if ( stencilTest ) {

                                                enable( 2960 );

                                        } else {

                                                disable( 2960 );

                                        }

                                }

                        },

                        setMask: function ( stencilMask ) {

                                if ( currentStencilMask !== stencilMask && ! locked ) {

                                        gl.stencilMask( stencilMask );
                                        currentStencilMask = stencilMask;

                                }

                        },

                        setFunc: function ( stencilFunc, stencilRef, stencilMask ) {

                                if ( currentStencilFunc !== stencilFunc ||
                                     currentStencilRef !== stencilRef ||
                                     currentStencilFuncMask !== stencilMask ) {

                                        gl.stencilFunc( stencilFunc, stencilRef, stencilMask );

                                        currentStencilFunc = stencilFunc;
                                        currentStencilRef = stencilRef;
                                        currentStencilFuncMask = stencilMask;

                                }

                        },

                        setOp: function ( stencilFail, stencilZFail, stencilZPass ) {

                                if ( currentStencilFail !== stencilFail ||
                                     currentStencilZFail !== stencilZFail ||
                                     currentStencilZPass !== stencilZPass ) {

                                        gl.stencilOp( stencilFail, stencilZFail, stencilZPass );

                                        currentStencilFail = stencilFail;
                                        currentStencilZFail = stencilZFail;
                                        currentStencilZPass = stencilZPass;

                                }

                        },

                        setLocked: function ( lock ) {

                                locked = lock;

                        },

                        setClear: function ( stencil ) {

                                if ( currentStencilClear !== stencil ) {

                                        gl.clearStencil( stencil );
                                        currentStencilClear = stencil;

                                }

                        },

                        reset: function () {

                                locked = false;

                                currentStencilMask = null;
                                currentStencilFunc = null;
                                currentStencilRef = null;
                                currentStencilFuncMask = null;
                                currentStencilFail = null;
                                currentStencilZFail = null;
                                currentStencilZPass = null;
                                currentStencilClear = null;

                        }

                };

        }

        //

        const colorBuffer = new ColorBuffer();
        const depthBuffer = new DepthBuffer();
        const stencilBuffer = new StencilBuffer();

        let enabledCapabilities = {};

        let currentProgram = null;

        let currentBlendingEnabled = null;
        let currentBlending = null;
        let currentBlendEquation = null;
        let currentBlendSrc = null;
        let currentBlendDst = null;
        let currentBlendEquationAlpha = null;
        let currentBlendSrcAlpha = null;
        let currentBlendDstAlpha = null;
        let currentPremultipledAlpha = false;

        let currentFlipSided = null;
        let currentCullFace = null;

        let currentLineWidth = null;

        let currentPolygonOffsetFactor = null;
        let currentPolygonOffsetUnits = null;

        const maxTextures = gl.getParameter( 35661 );

        let lineWidthAvailable = false;
        let version = 0;
        const glVersion = gl.getParameter( 7938 );

        if ( glVersion.indexOf( 'WebGL' ) !== - 1 ) {

                version = parseFloat( /^WebGL\ ([0-9])/.exec( glVersion )[ 1 ] );
                lineWidthAvailable = ( version >= 1.0 );

        } else if ( glVersion.indexOf( 'OpenGL ES' ) !== - 1 ) {

                version = parseFloat( /^OpenGL\ ES\ ([0-9])/.exec( glVersion )[ 1 ] );
                lineWidthAvailable = ( version >= 2.0 );

        }

        let currentTextureSlot = null;
        let currentBoundTextures = {};

        const currentScissor = new Vector4();
        const currentViewport = new Vector4();

        function createTexture( type, target, count ) {

                const data = new Uint8Array( 4 ); // 4 is required to match default unpack alignment of 4.
                const texture = gl.createTexture();

                gl.bindTexture( type, texture );
                gl.texParameteri( type, 10241, 9728 );
                gl.texParameteri( type, 10240, 9728 );

                for ( let i = 0; i < count; i ++ ) {

                        gl.texImage2D( target + i, 0, 6408, 1, 1, 0, 6408, 5121, data );

                }

                return texture;

        }

        const emptyTextures = {};
        emptyTextures[ 3553 ] = createTexture( 3553, 3553, 1 );
        emptyTextures[ 34067 ] = createTexture( 34067, 34069, 6 );

        // init

        colorBuffer.setClear( 0, 0, 0, 1 );
        depthBuffer.setClear( 1 );
        stencilBuffer.setClear( 0 );

        enable( 2929 );
        depthBuffer.setFunc( LessEqualDepth );

        setFlipSided( false );
        setCullFace( CullFaceBack );
        enable( 2884 );

        setBlending( NoBlending );

        //

        function enable( id ) {

                if ( enabledCapabilities[ id ] !== true ) {

                        gl.enable( id );
                        enabledCapabilities[ id ] = true;

                }

        }

        function disable( id ) {

                if ( enabledCapabilities[ id ] !== false ) {

                        gl.disable( id );
                        enabledCapabilities[ id ] = false;

                }

        }

        function useProgram( program ) {

                if ( currentProgram !== program ) {

                        gl.useProgram( program );

                        currentProgram = program;

                        return true;

                }

                return false;

        }

        const equationToGL = {
                [ AddEquation ]: 32774,
                [ SubtractEquation ]: 32778,
                [ ReverseSubtractEquation ]: 32779
        };

        if ( isWebGL2 ) {

                equationToGL[ MinEquation ] = 32775;
                equationToGL[ MaxEquation ] = 32776;

        } else {

                const extension = extensions.get( 'EXT_blend_minmax' );

                if ( extension !== null ) {

                        equationToGL[ MinEquation ] = extension.MIN_EXT;
                        equationToGL[ MaxEquation ] = extension.MAX_EXT;

                }

        }

        const factorToGL = {
                [ ZeroFactor ]: 0,
                [ OneFactor ]: 1,
                [ SrcColorFactor ]: 768,
                [ SrcAlphaFactor ]: 770,
                [ SrcAlphaSaturateFactor ]: 776,
                [ DstColorFactor ]: 774,
                [ DstAlphaFactor ]: 772,
                [ OneMinusSrcColorFactor ]: 769,
                [ OneMinusSrcAlphaFactor ]: 771,
                [ OneMinusDstColorFactor ]: 775,
                [ OneMinusDstAlphaFactor ]: 773
        };

        function setBlending( blending, blendEquation, blendSrc, blendDst, blendEquationAlpha, blendSrcAlpha, blendDstAlpha, premultipliedAlpha ) {

                if ( blending === NoBlending ) {

                        if ( currentBlendingEnabled ) {

                                disable( 3042 );
                                currentBlendingEnabled = false;

                        }

                        return;

                }

                if ( ! currentBlendingEnabled ) {

                        enable( 3042 );
                        currentBlendingEnabled = true;

                }

                if ( blending !== CustomBlending ) {

                        if ( blending !== currentBlending || premultipliedAlpha !== currentPremultipledAlpha ) {

                                if ( currentBlendEquation !== AddEquation || currentBlendEquationAlpha !== AddEquation ) {

                                        gl.blendEquation( 32774 );

                                        currentBlendEquation = AddEquation;
                                        currentBlendEquationAlpha = AddEquation;

                                }

                                if ( premultipliedAlpha ) {

                                        switch ( blending ) {

                                                case NormalBlending:
                                                        gl.blendFuncSeparate( 1, 771, 1, 771 );
                                                        break;

                                                case AdditiveBlending:
                                                        gl.blendFunc( 1, 1 );
                                                        break;

                                                case SubtractiveBlending:
                                                        gl.blendFuncSeparate( 0, 0, 769, 771 );
                                                        break;

                                                case MultiplyBlending:
                                                        gl.blendFuncSeparate( 0, 768, 0, 770 );
                                                        break;

                                                default:
                                                        console.error( 'THREE.WebGLState: Invalid blending: ', blending );
                                                        break;

                                        }

                                } else {

                                        switch ( blending ) {

                                                case NormalBlending:
                                                        gl.blendFuncSeparate( 770, 771, 1, 771 );
                                                        break;

                                                case AdditiveBlending:
                                                        gl.blendFunc( 770, 1 );
                                                        break;

                                                case SubtractiveBlending:
                                                        gl.blendFunc( 0, 769 );
                                                        break;

                                                case MultiplyBlending:
                                                        gl.blendFunc( 0, 768 );
                                                        break;

                                                default:
                                                        console.error( 'THREE.WebGLState: Invalid blending: ', blending );
                                                        break;

                                        }

                                }

                                currentBlendSrc = null;
                                currentBlendDst = null;
                                currentBlendSrcAlpha = null;
                                currentBlendDstAlpha = null;

                                currentBlending = blending;
                                currentPremultipledAlpha = premultipliedAlpha;

                        }

                        return;

                }

                // custom blending

                blendEquationAlpha = blendEquationAlpha || blendEquation;
                blendSrcAlpha = blendSrcAlpha || blendSrc;
                blendDstAlpha = blendDstAlpha || blendDst;

                if ( blendEquation !== currentBlendEquation || blendEquationAlpha !== currentBlendEquationAlpha ) {

                        gl.blendEquationSeparate( equationToGL[ blendEquation ], equationToGL[ blendEquationAlpha ] );

                        currentBlendEquation = blendEquation;
                        currentBlendEquationAlpha = blendEquationAlpha;

                }

                if ( blendSrc !== currentBlendSrc || blendDst !== currentBlendDst || blendSrcAlpha !== currentBlendSrcAlpha || blendDstAlpha !== currentBlendDstAlpha ) {

                        gl.blendFuncSeparate( factorToGL[ blendSrc ], factorToGL[ blendDst ], factorToGL[ blendSrcAlpha ], factorToGL[ blendDstAlpha ] );

                        currentBlendSrc = blendSrc;
                        currentBlendDst = blendDst;
                        currentBlendSrcAlpha = blendSrcAlpha;
                        currentBlendDstAlpha = blendDstAlpha;

                }

                currentBlending = blending;
                currentPremultipledAlpha = null;

        }

        function setMaterial( material, frontFaceCW ) {

                material.side === DoubleSide
                        ? disable( 2884 )
                        : enable( 2884 );

                let flipSided = ( material.side === BackSide );
                if ( frontFaceCW ) flipSided = ! flipSided;

                setFlipSided( flipSided );

                ( material.blending === NormalBlending && material.transparent === false )
                        ? setBlending( NoBlending )
                        : setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst, material.blendEquationAlpha, material.blendSrcAlpha, material.blendDstAlpha, material.premultipliedAlpha );

                depthBuffer.setFunc( material.depthFunc );
                depthBuffer.setTest( material.depthTest );
                depthBuffer.setMask( material.depthWrite );
                colorBuffer.setMask( material.colorWrite );

                const stencilWrite = material.stencilWrite;
                stencilBuffer.setTest( stencilWrite );
                if ( stencilWrite ) {

                        stencilBuffer.setMask( material.stencilWriteMask );
                        stencilBuffer.setFunc( material.stencilFunc, material.stencilRef, material.stencilFuncMask );
                        stencilBuffer.setOp( material.stencilFail, material.stencilZFail, material.stencilZPass );

                }

                setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );

        }

        //

        function setFlipSided( flipSided ) {

                if ( currentFlipSided !== flipSided ) {

                        if ( flipSided ) {

                                gl.frontFace( 2304 );

                        } else {

                                gl.frontFace( 2305 );

                        }

                        currentFlipSided = flipSided;

                }

        }

        function setCullFace( cullFace ) {

                if ( cullFace !== CullFaceNone ) {

                        enable( 2884 );

                        if ( cullFace !== currentCullFace ) {

                                if ( cullFace === CullFaceBack ) {

                                        gl.cullFace( 1029 );

                                } else if ( cullFace === CullFaceFront ) {

                                        gl.cullFace( 1028 );

                                } else {

                                        gl.cullFace( 1032 );

                                }

                        }

                } else {

                        disable( 2884 );

                }

                currentCullFace = cullFace;

        }

        function setLineWidth( width ) {

                if ( width !== currentLineWidth ) {

                        if ( lineWidthAvailable ) gl.lineWidth( width );

                        currentLineWidth = width;

                }

        }

        function setPolygonOffset( polygonOffset, factor, units ) {

                if ( polygonOffset ) {

                        enable( 32823 );

                        if ( currentPolygonOffsetFactor !== factor || currentPolygonOffsetUnits !== units ) {

                                gl.polygonOffset( factor, units );

                                currentPolygonOffsetFactor = factor;
                                currentPolygonOffsetUnits = units;

                        }

                } else {

                        disable( 32823 );

                }

        }

        function setScissorTest( scissorTest ) {

                if ( scissorTest ) {

                        enable( 3089 );

                } else {

                        disable( 3089 );

                }

        }

        // texture

        function activeTexture( webglSlot ) {

                if ( webglSlot === undefined ) webglSlot = 33984 + maxTextures - 1;

                if ( currentTextureSlot !== webglSlot ) {

                        gl.activeTexture( webglSlot );
                        currentTextureSlot = webglSlot;

                }

        }

        function bindTexture( webglType, webglTexture ) {

                if ( currentTextureSlot === null ) {

                        activeTexture();

                }

                let boundTexture = currentBoundTextures[ currentTextureSlot ];

                if ( boundTexture === undefined ) {

                        boundTexture = { type: undefined, texture: undefined };
                        currentBoundTextures[ currentTextureSlot ] = boundTexture;

                }

                if ( boundTexture.type !== webglType || boundTexture.texture !== webglTexture ) {

                        gl.bindTexture( webglType, webglTexture || emptyTextures[ webglType ] );

                        boundTexture.type = webglType;
                        boundTexture.texture = webglTexture;

                }

        }

        function unbindTexture() {

                const boundTexture = currentBoundTextures[ currentTextureSlot ];

                if ( boundTexture !== undefined && boundTexture.type !== undefined ) {

                        gl.bindTexture( boundTexture.type, null );

                        boundTexture.type = undefined;
                        boundTexture.texture = undefined;

                }

        }

        function compressedTexImage2D() {

                try {

                        gl.compressedTexImage2D.apply( gl, arguments );

                } catch ( error ) {

                        console.error( 'THREE.WebGLState:', error );

                }

        }

        function texImage2D() {

                try {

                        gl.texImage2D.apply( gl, arguments );

                } catch ( error ) {

                        console.error( 'THREE.WebGLState:', error );

                }

        }

        function texImage3D() {

                try {

                        gl.texImage3D.apply( gl, arguments );

                } catch ( error ) {

                        console.error( 'THREE.WebGLState:', error );

                }

        }

        //

        function scissor( scissor ) {

                if ( currentScissor.equals( scissor ) === false ) {

                        gl.scissor( scissor.x, scissor.y, scissor.z, scissor.w );
                        currentScissor.copy( scissor );

                }

        }

        function viewport( viewport ) {

                if ( currentViewport.equals( viewport ) === false ) {

                        gl.viewport( viewport.x, viewport.y, viewport.z, viewport.w );
                        currentViewport.copy( viewport );

                }

        }

        //

        function reset() {

                enabledCapabilities = {};

                currentTextureSlot = null;
                currentBoundTextures = {};

                currentProgram = null;

                currentBlendingEnabled = null;
                currentBlending = null;
                currentBlendEquation = null;
                currentBlendSrc = null;
                currentBlendDst = null;
                currentBlendEquationAlpha = null;
                currentBlendSrcAlpha = null;
                currentBlendDstAlpha = null;
                currentPremultipledAlpha = false;

                currentFlipSided = null;
                currentCullFace = null;

                currentLineWidth = null;

                currentPolygonOffsetFactor = null;
                currentPolygonOffsetUnits = null;

                colorBuffer.reset();
                depthBuffer.reset();
                stencilBuffer.reset();

        }

        return {

                buffers: {
                        color: colorBuffer,
                        depth: depthBuffer,
                        stencil: stencilBuffer
                },

                enable: enable,
                disable: disable,

                useProgram: useProgram,

                setBlending: setBlending,
                setMaterial: setMaterial,

                setFlipSided: setFlipSided,
                setCullFace: setCullFace,

                setLineWidth: setLineWidth,
                setPolygonOffset: setPolygonOffset,

                setScissorTest: setScissorTest,

                activeTexture: activeTexture,
                bindTexture: bindTexture,
                unbindTexture: unbindTexture,
                compressedTexImage2D: compressedTexImage2D,
                texImage2D: texImage2D,
                texImage3D: texImage3D,

                scissor: scissor,
                viewport: viewport,

                reset: reset

        };

}

function WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info ) {

        const isWebGL2 = capabilities.isWebGL2;
        const maxTextures = capabilities.maxTextures;
        const maxCubemapSize = capabilities.maxCubemapSize;
        const maxTextureSize = capabilities.maxTextureSize;
        const maxSamples = capabilities.maxSamples;

        const _videoTextures = new WeakMap();
        let _canvas;

        // cordova iOS (as of 5.0) still uses UIWebView, which provides OffscreenCanvas,
        // also OffscreenCanvas.getContext("webgl"), but not OffscreenCanvas.getContext("2d")!
        // Some implementations may only implement OffscreenCanvas partially (e.g. lacking 2d).

        let useOffscreenCanvas = false;

        try {

                useOffscreenCanvas = typeof OffscreenCanvas !== 'undefined'
                        && ( new OffscreenCanvas( 1, 1 ).getContext( "2d" ) ) !== null;

        } catch ( err ) {

                // Ignore any errors

        }

        function createCanvas( width, height ) {

                // Use OffscreenCanvas when available. Specially needed in web workers

                return useOffscreenCanvas ?
                        new OffscreenCanvas( width, height ) :
                        document.createElementNS( 'http://www.w3.org/1999/xhtml', 'canvas' );

        }

        function resizeImage( image, needsPowerOfTwo, needsNewCanvas, maxSize ) {

                let scale = 1;

                // handle case if texture exceeds max size

                if ( image.width > maxSize || image.height > maxSize ) {

                        scale = maxSize / Math.max( image.width, image.height );

                }

                // only perform resize if necessary

                if ( scale < 1 || needsPowerOfTwo === true ) {

                        // only perform resize for certain image types

                        if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||
                                ( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||
                                ( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ) {

                                const floor = needsPowerOfTwo ? MathUtils.floorPowerOfTwo : Math.floor;

                                const width = floor( scale * image.width );
                                const height = floor( scale * image.height );

                                if ( _canvas === undefined ) _canvas = createCanvas( width, height );

                                // cube textures can't reuse the same canvas

                                const canvas = needsNewCanvas ? createCanvas( width, height ) : _canvas;

                                canvas.width = width;
                                canvas.height = height;

                                const context = canvas.getContext( '2d' );
                                context.drawImage( image, 0, 0, width, height );

                                console.warn( 'THREE.WebGLRenderer: Texture has been resized from (' + image.width + 'x' + image.height + ') to (' + width + 'x' + height + ').' );

                                return canvas;

                        } else {

                                if ( 'data' in image ) {

                                        console.warn( 'THREE.WebGLRenderer: Image in DataTexture is too big (' + image.width + 'x' + image.height + ').' );

                                }

                                return image;

                        }

                }

                return image;

        }

        function isPowerOfTwo( image ) {

                return MathUtils.isPowerOfTwo( image.width ) && MathUtils.isPowerOfTwo( image.height );

        }

        function textureNeedsPowerOfTwo( texture ) {

                if ( isWebGL2 ) return false;

                return ( texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping ) ||
                        ( texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter );

        }

        function textureNeedsGenerateMipmaps( texture, supportsMips ) {

                return texture.generateMipmaps && supportsMips &&
                        texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter;

        }

        function generateMipmap( target, texture, width, height ) {

                _gl.generateMipmap( target );

                const textureProperties = properties.get( texture );

                // Note: Math.log( x ) * Math.LOG2E used instead of Math.log2( x ) which is not supported by IE11
                textureProperties.__maxMipLevel = Math.log( Math.max( width, height ) ) * Math.LOG2E;

        }

        function getInternalFormat( internalFormatName, glFormat, glType ) {

                if ( isWebGL2 === false ) return glFormat;

                if ( internalFormatName !== null ) {

                        if ( _gl[ internalFormatName ] !== undefined ) return _gl[ internalFormatName ];

                        console.warn( 'THREE.WebGLRenderer: Attempt to use non-existing WebGL internal format \'' + internalFormatName + '\'' );

                }

                let internalFormat = glFormat;

                if ( glFormat === 6403 ) {

                        if ( glType === 5126 ) internalFormat = 33326;
                        if ( glType === 5131 ) internalFormat = 33325;
                        if ( glType === 5121 ) internalFormat = 33321;

                }

                if ( glFormat === 6407 ) {

                        if ( glType === 5126 ) internalFormat = 34837;
                        if ( glType === 5131 ) internalFormat = 34843;
                        if ( glType === 5121 ) internalFormat = 32849;

                }

                if ( glFormat === 6408 ) {

                        if ( glType === 5126 ) internalFormat = 34836;
                        if ( glType === 5131 ) internalFormat = 34842;
                        if ( glType === 5121 ) internalFormat = 32856;

                }

                if ( internalFormat === 33325 || internalFormat === 33326 ||
                        internalFormat === 34842 || internalFormat === 34836 ) {

                        extensions.get( 'EXT_color_buffer_float' );

                }

                return internalFormat;

        }

        // Fallback filters for non-power-of-2 textures

        function filterFallback( f ) {

                if ( f === NearestFilter || f === NearestMipmapNearestFilter || f === NearestMipmapLinearFilter ) {

                        return 9728;

                }

                return 9729;

        }

        //

        function onTextureDispose( event ) {

                const texture = event.target;

                texture.removeEventListener( 'dispose', onTextureDispose );

                deallocateTexture( texture );

                if ( texture.isVideoTexture ) {

                        _videoTextures.delete( texture );

                }

                info.memory.textures --;

        }

        function onRenderTargetDispose( event ) {

                const renderTarget = event.target;

                renderTarget.removeEventListener( 'dispose', onRenderTargetDispose );

                deallocateRenderTarget( renderTarget );

                info.memory.textures --;

        }

        //

        function deallocateTexture( texture ) {

                const textureProperties = properties.get( texture );

                if ( textureProperties.__webglInit === undefined ) return;

                _gl.deleteTexture( textureProperties.__webglTexture );

                properties.remove( texture );

        }

        function deallocateRenderTarget( renderTarget ) {

                const renderTargetProperties = properties.get( renderTarget );
                const textureProperties = properties.get( renderTarget.texture );

                if ( ! renderTarget ) return;

                if ( textureProperties.__webglTexture !== undefined ) {

                        _gl.deleteTexture( textureProperties.__webglTexture );

                }

                if ( renderTarget.depthTexture ) {

                        renderTarget.depthTexture.dispose();

                }

                if ( renderTarget.isWebGLCubeRenderTarget ) {

                        for ( let i = 0; i < 6; i ++ ) {

                                _gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ i ] );
                                if ( renderTargetProperties.__webglDepthbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer[ i ] );

                        }

                } else {

                        _gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer );
                        if ( renderTargetProperties.__webglDepthbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer );
                        if ( renderTargetProperties.__webglMultisampledFramebuffer ) _gl.deleteFramebuffer( renderTargetProperties.__webglMultisampledFramebuffer );
                        if ( renderTargetProperties.__webglColorRenderbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglColorRenderbuffer );
                        if ( renderTargetProperties.__webglDepthRenderbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthRenderbuffer );

                }

                properties.remove( renderTarget.texture );
                properties.remove( renderTarget );

        }

        //

        let textureUnits = 0;

        function resetTextureUnits() {

                textureUnits = 0;

        }

        function allocateTextureUnit() {

                const textureUnit = textureUnits;

                if ( textureUnit >= maxTextures ) {

                        console.warn( 'THREE.WebGLTextures: Trying to use ' + textureUnit + ' texture units while this GPU supports only ' + maxTextures );

                }

                textureUnits += 1;

                return textureUnit;

        }

        //

        function setTexture2D( texture, slot ) {

                const textureProperties = properties.get( texture );

                if ( texture.isVideoTexture ) updateVideoTexture( texture );

                if ( texture.version > 0 && textureProperties.__version !== texture.version ) {

                        const image = texture.image;

                        if ( image === undefined ) {

                                console.warn( 'THREE.WebGLRenderer: Texture marked for update but image is undefined' );

                        } else if ( image.complete === false ) {

                                console.warn( 'THREE.WebGLRenderer: Texture marked for update but image is incomplete' );

                        } else {

                                uploadTexture( textureProperties, texture, slot );
                                return;

                        }

                }

                state.activeTexture( 33984 + slot );
                state.bindTexture( 3553, textureProperties.__webglTexture );

        }

        function setTexture2DArray( texture, slot ) {

                const textureProperties = properties.get( texture );

                if ( texture.version > 0 && textureProperties.__version !== texture.version ) {

                        uploadTexture( textureProperties, texture, slot );
                        return;

                }

                state.activeTexture( 33984 + slot );
                state.bindTexture( 35866, textureProperties.__webglTexture );

        }

        function setTexture3D( texture, slot ) {

                const textureProperties = properties.get( texture );

                if ( texture.version > 0 && textureProperties.__version !== texture.version ) {

                        uploadTexture( textureProperties, texture, slot );
                        return;

                }

                state.activeTexture( 33984 + slot );
                state.bindTexture( 32879, textureProperties.__webglTexture );

        }

        function setTextureCube( texture, slot ) {

                const textureProperties = properties.get( texture );

                if ( texture.version > 0 && textureProperties.__version !== texture.version ) {

                        uploadCubeTexture( textureProperties, texture, slot );
                        return;

                }

                state.activeTexture( 33984 + slot );
                state.bindTexture( 34067, textureProperties.__webglTexture );

        }

        const wrappingToGL = {
                [ RepeatWrapping ]: 10497,
                [ ClampToEdgeWrapping ]: 33071,
                [ MirroredRepeatWrapping ]: 33648
        };

        const filterToGL = {
                [ NearestFilter ]: 9728,
                [ NearestMipmapNearestFilter ]: 9984,
                [ NearestMipmapLinearFilter ]: 9986,

                [ LinearFilter ]: 9729,
                [ LinearMipmapNearestFilter ]: 9985,
                [ LinearMipmapLinearFilter ]: 9987
        };

        function setTextureParameters( textureType, texture, supportsMips ) {

                if ( supportsMips ) {

                        _gl.texParameteri( textureType, 10242, wrappingToGL[ texture.wrapS ] );
                        _gl.texParameteri( textureType, 10243, wrappingToGL[ texture.wrapT ] );

                        if ( textureType === 32879 || textureType === 35866 ) {

                                _gl.texParameteri( textureType, 32882, wrappingToGL[ texture.wrapR ] );

                        }

                        _gl.texParameteri( textureType, 10240, filterToGL[ texture.magFilter ] );
                        _gl.texParameteri( textureType, 10241, filterToGL[ texture.minFilter ] );

                } else {

                        _gl.texParameteri( textureType, 10242, 33071 );
                        _gl.texParameteri( textureType, 10243, 33071 );

                        if ( textureType === 32879 || textureType === 35866 ) {

                                _gl.texParameteri( textureType, 32882, 33071 );

                        }

                        if ( texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping ) {

                                console.warn( 'THREE.WebGLRenderer: Texture is not power of two. Texture.wrapS and Texture.wrapT should be set to THREE.ClampToEdgeWrapping.' );

                        }

                        _gl.texParameteri( textureType, 10240, filterFallback( texture.magFilter ) );
                        _gl.texParameteri( textureType, 10241, filterFallback( texture.minFilter ) );

                        if ( texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter ) {

                                console.warn( 'THREE.WebGLRenderer: Texture is not power of two. Texture.minFilter should be set to THREE.NearestFilter or THREE.LinearFilter.' );

                        }

                }

                const extension = extensions.get( 'EXT_texture_filter_anisotropic' );

                if ( extension ) {

                        if ( texture.type === FloatType && extensions.get( 'OES_texture_float_linear' ) === null ) return;
                        if ( texture.type === HalfFloatType && ( isWebGL2 || extensions.get( 'OES_texture_half_float_linear' ) ) === null ) return;

                        if ( texture.anisotropy > 1 || properties.get( texture ).__currentAnisotropy ) {

                                _gl.texParameterf( textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min( texture.anisotropy, capabilities.getMaxAnisotropy() ) );
                                properties.get( texture ).__currentAnisotropy = texture.anisotropy;

                        }

                }

        }

        function initTexture( textureProperties, texture ) {

                if ( textureProperties.__webglInit === undefined ) {

                        textureProperties.__webglInit = true;

                        texture.addEventListener( 'dispose', onTextureDispose );

                        textureProperties.__webglTexture = _gl.createTexture();

                        info.memory.textures ++;

                }

        }

        function uploadTexture( textureProperties, texture, slot ) {

                let textureType = 3553;

                if ( texture.isDataTexture2DArray ) textureType = 35866;
                if ( texture.isDataTexture3D ) textureType = 32879;

                initTexture( textureProperties, texture );

                state.activeTexture( 33984 + slot );
                state.bindTexture( textureType, textureProperties.__webglTexture );

                _gl.pixelStorei( 37440, texture.flipY );
                _gl.pixelStorei( 37441, texture.premultiplyAlpha );
                _gl.pixelStorei( 3317, texture.unpackAlignment );

                const needsPowerOfTwo = textureNeedsPowerOfTwo( texture ) && isPowerOfTwo( texture.image ) === false;
                const image = resizeImage( texture.image, needsPowerOfTwo, false, maxTextureSize );

                const supportsMips = isPowerOfTwo( image ) || isWebGL2,
                        glFormat = utils.convert( texture.format );

                let glType = utils.convert( texture.type ),
                        glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType );

                setTextureParameters( textureType, texture, supportsMips );

                let mipmap;
                const mipmaps = texture.mipmaps;

                if ( texture.isDepthTexture ) {

                        // populate depth texture with dummy data

                        glInternalFormat = 6402;

                        if ( isWebGL2 ) {

                                if ( texture.type === FloatType ) {

                                        glInternalFormat = 36012;

                                } else if ( texture.type === UnsignedIntType ) {

                                        glInternalFormat = 33190;

                                } else if ( texture.type === UnsignedInt248Type ) {

                                        glInternalFormat = 35056;

                                } else {

                                        glInternalFormat = 33189; // WebGL2 requires sized internalformat for glTexImage2D

                                }

                        } else {

                                if ( texture.type === FloatType ) {

                                        console.error( 'WebGLRenderer: Floating point depth texture requires WebGL2.' );

                                }

                        }

                        // validation checks for WebGL 1

                        if ( texture.format === DepthFormat && glInternalFormat === 6402 ) {

                                // The error INVALID_OPERATION is generated by texImage2D if format and internalformat are
                                // DEPTH_COMPONENT and type is not UNSIGNED_SHORT or UNSIGNED_INT
                                // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
                                if ( texture.type !== UnsignedShortType && texture.type !== UnsignedIntType ) {

                                        console.warn( 'THREE.WebGLRenderer: Use UnsignedShortType or UnsignedIntType for DepthFormat DepthTexture.' );

                                        texture.type = UnsignedShortType;
                                        glType = utils.convert( texture.type );

                                }

                        }

                        if ( texture.format === DepthStencilFormat && glInternalFormat === 6402 ) {

                                // Depth stencil textures need the DEPTH_STENCIL internal format
                                // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
                                glInternalFormat = 34041;

                                // The error INVALID_OPERATION is generated by texImage2D if format and internalformat are
                                // DEPTH_STENCIL and type is not UNSIGNED_INT_24_8_WEBGL.
                                // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
                                if ( texture.type !== UnsignedInt248Type ) {

                                        console.warn( 'THREE.WebGLRenderer: Use UnsignedInt248Type for DepthStencilFormat DepthTexture.' );

                                        texture.type = UnsignedInt248Type;
                                        glType = utils.convert( texture.type );

                                }

                        }

                        //

                        state.texImage2D( 3553, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, null );

                } else if ( texture.isDataTexture ) {

                        // use manually created mipmaps if available
                        // if there are no manual mipmaps
                        // set 0 level mipmap and then use GL to generate other mipmap levels

                        if ( mipmaps.length > 0 && supportsMips ) {

                                for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {

                                        mipmap = mipmaps[ i ];
                                        state.texImage2D( 3553, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );

                                }

                                texture.generateMipmaps = false;
                                textureProperties.__maxMipLevel = mipmaps.length - 1;

                        } else {

                                state.texImage2D( 3553, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, image.data );
                                textureProperties.__maxMipLevel = 0;

                        }

                } else if ( texture.isCompressedTexture ) {

                        for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {

                                mipmap = mipmaps[ i ];

                                if ( texture.format !== RGBAFormat && texture.format !== RGBFormat ) {

                                        if ( glFormat !== null ) {

                                                state.compressedTexImage2D( 3553, i, glInternalFormat, mipmap.width, mipmap.height, 0, mipmap.data );

                                        } else {

                                                console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .uploadTexture()' );

                                        }

                                } else {

                                        state.texImage2D( 3553, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );

                                }

                        }

                        textureProperties.__maxMipLevel = mipmaps.length - 1;

                } else if ( texture.isDataTexture2DArray ) {

                        state.texImage3D( 35866, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );
                        textureProperties.__maxMipLevel = 0;

                } else if ( texture.isDataTexture3D ) {

                        state.texImage3D( 32879, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );
                        textureProperties.__maxMipLevel = 0;

                } else {

                        // regular Texture (image, video, canvas)

                        // use manually created mipmaps if available
                        // if there are no manual mipmaps
                        // set 0 level mipmap and then use GL to generate other mipmap levels

                        if ( mipmaps.length > 0 && supportsMips ) {

                                for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {

                                        mipmap = mipmaps[ i ];
                                        state.texImage2D( 3553, i, glInternalFormat, glFormat, glType, mipmap );

                                }

                                texture.generateMipmaps = false;
                                textureProperties.__maxMipLevel = mipmaps.length - 1;

                        } else {

                                state.texImage2D( 3553, 0, glInternalFormat, glFormat, glType, image );
                                textureProperties.__maxMipLevel = 0;

                        }

                }

                if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {

                        generateMipmap( textureType, texture, image.width, image.height );

                }

                textureProperties.__version = texture.version;

                if ( texture.onUpdate ) texture.onUpdate( texture );

        }

        function uploadCubeTexture( textureProperties, texture, slot ) {

                if ( texture.image.length !== 6 ) return;

                initTexture( textureProperties, texture );

                state.activeTexture( 33984 + slot );
                state.bindTexture( 34067, textureProperties.__webglTexture );

                _gl.pixelStorei( 37440, texture.flipY );

                const isCompressed = ( texture && ( texture.isCompressedTexture || texture.image[ 0 ].isCompressedTexture ) );
                const isDataTexture = ( texture.image[ 0 ] && texture.image[ 0 ].isDataTexture );

                const cubeImage = [];

                for ( let i = 0; i < 6; i ++ ) {

                        if ( ! isCompressed && ! isDataTexture ) {

                                cubeImage[ i ] = resizeImage( texture.image[ i ], false, true, maxCubemapSize );

                        } else {

                                cubeImage[ i ] = isDataTexture ? texture.image[ i ].image : texture.image[ i ];

                        }

                }

                const image = cubeImage[ 0 ],
                        supportsMips = isPowerOfTwo( image ) || isWebGL2,
                        glFormat = utils.convert( texture.format ),
                        glType = utils.convert( texture.type ),
                        glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType );

                setTextureParameters( 34067, texture, supportsMips );

                let mipmaps;

                if ( isCompressed ) {

                        for ( let i = 0; i < 6; i ++ ) {

                                mipmaps = cubeImage[ i ].mipmaps;

                                for ( let j = 0; j < mipmaps.length; j ++ ) {

                                        const mipmap = mipmaps[ j ];

                                        if ( texture.format !== RGBAFormat && texture.format !== RGBFormat ) {

                                                if ( glFormat !== null ) {

                                                        state.compressedTexImage2D( 34069 + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, mipmap.data );

                                                } else {

                                                        console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .setTextureCube()' );

                                                }

                                        } else {

                                                state.texImage2D( 34069 + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );

                                        }

                                }

                        }

                        textureProperties.__maxMipLevel = mipmaps.length - 1;

                } else {

                        mipmaps = texture.mipmaps;

                        for ( let i = 0; i < 6; i ++ ) {

                                if ( isDataTexture ) {

                                        state.texImage2D( 34069 + i, 0, glInternalFormat, cubeImage[ i ].width, cubeImage[ i ].height, 0, glFormat, glType, cubeImage[ i ].data );

                                        for ( let j = 0; j < mipmaps.length; j ++ ) {

                                                const mipmap = mipmaps[ j ];
                                                const mipmapImage = mipmap.image[ i ].image;

                                                state.texImage2D( 34069 + i, j + 1, glInternalFormat, mipmapImage.width, mipmapImage.height, 0, glFormat, glType, mipmapImage.data );

                                        }

                                } else {

                                        state.texImage2D( 34069 + i, 0, glInternalFormat, glFormat, glType, cubeImage[ i ] );

                                        for ( let j = 0; j < mipmaps.length; j ++ ) {

                                                const mipmap = mipmaps[ j ];

                                                state.texImage2D( 34069 + i, j + 1, glInternalFormat, glFormat, glType, mipmap.image[ i ] );

                                        }

                                }

                        }

                        textureProperties.__maxMipLevel = mipmaps.length;

                }

                if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {

                        // We assume images for cube map have the same size.
                        generateMipmap( 34067, texture, image.width, image.height );

                }

                textureProperties.__version = texture.version;

                if ( texture.onUpdate ) texture.onUpdate( texture );

        }

        // Render targets

        // Setup storage for target texture and bind it to correct framebuffer
        function setupFrameBufferTexture( framebuffer, renderTarget, attachment, textureTarget ) {

                const glFormat = utils.convert( renderTarget.texture.format );
                const glType = utils.convert( renderTarget.texture.type );
                const glInternalFormat = getInternalFormat( renderTarget.texture.internalFormat, glFormat, glType );
                state.texImage2D( textureTarget, 0, glInternalFormat, renderTarget.width, renderTarget.height, 0, glFormat, glType, null );
                _gl.bindFramebuffer( 36160, framebuffer );
                _gl.framebufferTexture2D( 36160, attachment, textureTarget, properties.get( renderTarget.texture ).__webglTexture, 0 );
                _gl.bindFramebuffer( 36160, null );

        }

        // Setup storage for internal depth/stencil buffers and bind to correct framebuffer
        function setupRenderBufferStorage( renderbuffer, renderTarget, isMultisample ) {

                _gl.bindRenderbuffer( 36161, renderbuffer );

                if ( renderTarget.depthBuffer && ! renderTarget.stencilBuffer ) {

                        let glInternalFormat = 33189;

                        if ( isMultisample ) {

                                const depthTexture = renderTarget.depthTexture;

                                if ( depthTexture && depthTexture.isDepthTexture ) {

                                        if ( depthTexture.type === FloatType ) {

                                                glInternalFormat = 36012;

                                        } else if ( depthTexture.type === UnsignedIntType ) {

                                                glInternalFormat = 33190;

                                        }

                                }

                                const samples = getRenderTargetSamples( renderTarget );

                                _gl.renderbufferStorageMultisample( 36161, samples, glInternalFormat, renderTarget.width, renderTarget.height );

                        } else {

                                _gl.renderbufferStorage( 36161, glInternalFormat, renderTarget.width, renderTarget.height );

                        }

                        _gl.framebufferRenderbuffer( 36160, 36096, 36161, renderbuffer );

                } else if ( renderTarget.depthBuffer && renderTarget.stencilBuffer ) {

                        if ( isMultisample ) {

                                const samples = getRenderTargetSamples( renderTarget );

                                _gl.renderbufferStorageMultisample( 36161, samples, 35056, renderTarget.width, renderTarget.height );

                        } else {

                                _gl.renderbufferStorage( 36161, 34041, renderTarget.width, renderTarget.height );

                        }


                        _gl.framebufferRenderbuffer( 36160, 33306, 36161, renderbuffer );

                } else {

                        const glFormat = utils.convert( renderTarget.texture.format );
                        const glType = utils.convert( renderTarget.texture.type );
                        const glInternalFormat = getInternalFormat( renderTarget.texture.internalFormat, glFormat, glType );

                        if ( isMultisample ) {

                                const samples = getRenderTargetSamples( renderTarget );

                                _gl.renderbufferStorageMultisample( 36161, samples, glInternalFormat, renderTarget.width, renderTarget.height );

                        } else {

                                _gl.renderbufferStorage( 36161, glInternalFormat, renderTarget.width, renderTarget.height );

                        }

                }

                _gl.bindRenderbuffer( 36161, null );

        }

        // Setup resources for a Depth Texture for a FBO (needs an extension)
        function setupDepthTexture( framebuffer, renderTarget ) {

                const isCube = ( renderTarget && renderTarget.isWebGLCubeRenderTarget );
                if ( isCube ) throw new Error( 'Depth Texture with cube render targets is not supported' );

                _gl.bindFramebuffer( 36160, framebuffer );

                if ( ! ( renderTarget.depthTexture && renderTarget.depthTexture.isDepthTexture ) ) {

                        throw new Error( 'renderTarget.depthTexture must be an instance of THREE.DepthTexture' );

                }

                // upload an empty depth texture with framebuffer size
                if ( ! properties.get( renderTarget.depthTexture ).__webglTexture ||
                                renderTarget.depthTexture.image.width !== renderTarget.width ||
                                renderTarget.depthTexture.image.height !== renderTarget.height ) {

                        renderTarget.depthTexture.image.width = renderTarget.width;
                        renderTarget.depthTexture.image.height = renderTarget.height;
                        renderTarget.depthTexture.needsUpdate = true;

                }

                setTexture2D( renderTarget.depthTexture, 0 );

                const webglDepthTexture = properties.get( renderTarget.depthTexture ).__webglTexture;

                if ( renderTarget.depthTexture.format === DepthFormat ) {

                        _gl.framebufferTexture2D( 36160, 36096, 3553, webglDepthTexture, 0 );

                } else if ( renderTarget.depthTexture.format === DepthStencilFormat ) {

                        _gl.framebufferTexture2D( 36160, 33306, 3553, webglDepthTexture, 0 );

                } else {

                        throw new Error( 'Unknown depthTexture format' );

                }

        }

        // Setup GL resources for a non-texture depth buffer
        function setupDepthRenderbuffer( renderTarget ) {

                const renderTargetProperties = properties.get( renderTarget );

                const isCube = ( renderTarget.isWebGLCubeRenderTarget === true );

                if ( renderTarget.depthTexture ) {

                        if ( isCube ) throw new Error( 'target.depthTexture not supported in Cube render targets' );

                        setupDepthTexture( renderTargetProperties.__webglFramebuffer, renderTarget );

                } else {

                        if ( isCube ) {

                                renderTargetProperties.__webglDepthbuffer = [];

                                for ( let i = 0; i < 6; i ++ ) {

                                        _gl.bindFramebuffer( 36160, renderTargetProperties.__webglFramebuffer[ i ] );
                                        renderTargetProperties.__webglDepthbuffer[ i ] = _gl.createRenderbuffer();
                                        setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer[ i ], renderTarget, false );

                                }

                        } else {

                                _gl.bindFramebuffer( 36160, renderTargetProperties.__webglFramebuffer );
                                renderTargetProperties.__webglDepthbuffer = _gl.createRenderbuffer();
                                setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer, renderTarget, false );

                        }

                }

                _gl.bindFramebuffer( 36160, null );

        }

        // Set up GL resources for the render target
        function setupRenderTarget( renderTarget ) {

                const renderTargetProperties = properties.get( renderTarget );
                const textureProperties = properties.get( renderTarget.texture );

                renderTarget.addEventListener( 'dispose', onRenderTargetDispose );

                textureProperties.__webglTexture = _gl.createTexture();

                info.memory.textures ++;

                const isCube = ( renderTarget.isWebGLCubeRenderTarget === true );
                const isMultisample = ( renderTarget.isWebGLMultisampleRenderTarget === true );
                const supportsMips = isPowerOfTwo( renderTarget ) || isWebGL2;

                // Handles WebGL2 RGBFormat fallback - #18858

                if ( isWebGL2 && renderTarget.texture.format === RGBFormat && ( renderTarget.texture.type === FloatType || renderTarget.texture.type === HalfFloatType ) ) {

                        renderTarget.texture.format = RGBAFormat;

                        console.warn( 'THREE.WebGLRenderer: Rendering to textures with RGB format is not supported. Using RGBA format instead.' );

                }

                // Setup framebuffer

                if ( isCube ) {

                        renderTargetProperties.__webglFramebuffer = [];

                        for ( let i = 0; i < 6; i ++ ) {

                                renderTargetProperties.__webglFramebuffer[ i ] = _gl.createFramebuffer();

                        }

                } else {

                        renderTargetProperties.__webglFramebuffer = _gl.createFramebuffer();

                        if ( isMultisample ) {

                                if ( isWebGL2 ) {

                                        renderTargetProperties.__webglMultisampledFramebuffer = _gl.createFramebuffer();
                                        renderTargetProperties.__webglColorRenderbuffer = _gl.createRenderbuffer();

                                        _gl.bindRenderbuffer( 36161, renderTargetProperties.__webglColorRenderbuffer );

                                        const glFormat = utils.convert( renderTarget.texture.format );
                                        const glType = utils.convert( renderTarget.texture.type );
                                        const glInternalFormat = getInternalFormat( renderTarget.texture.internalFormat, glFormat, glType );
                                        const samples = getRenderTargetSamples( renderTarget );
                                        _gl.renderbufferStorageMultisample( 36161, samples, glInternalFormat, renderTarget.width, renderTarget.height );

                                        _gl.bindFramebuffer( 36160, renderTargetProperties.__webglMultisampledFramebuffer );
                                        _gl.framebufferRenderbuffer( 36160, 36064, 36161, renderTargetProperties.__webglColorRenderbuffer );
                                        _gl.bindRenderbuffer( 36161, null );

                                        if ( renderTarget.depthBuffer ) {

                                                renderTargetProperties.__webglDepthRenderbuffer = _gl.createRenderbuffer();
                                                setupRenderBufferStorage( renderTargetProperties.__webglDepthRenderbuffer, renderTarget, true );

                                        }

                                        _gl.bindFramebuffer( 36160, null );


                                } else {

                                        console.warn( 'THREE.WebGLRenderer: WebGLMultisampleRenderTarget can only be used with WebGL2.' );

                                }

                        }

                }

                // Setup color buffer

                if ( isCube ) {

                        state.bindTexture( 34067, textureProperties.__webglTexture );
                        setTextureParameters( 34067, renderTarget.texture, supportsMips );

                        for ( let i = 0; i < 6; i ++ ) {

                                setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ i ], renderTarget, 36064, 34069 + i );

                        }

                        if ( textureNeedsGenerateMipmaps( renderTarget.texture, supportsMips ) ) {

                                generateMipmap( 34067, renderTarget.texture, renderTarget.width, renderTarget.height );

                        }

                        state.bindTexture( 34067, null );

                } else {

                        state.bindTexture( 3553, textureProperties.__webglTexture );
                        setTextureParameters( 3553, renderTarget.texture, supportsMips );
                        setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, 36064, 3553 );

                        if ( textureNeedsGenerateMipmaps( renderTarget.texture, supportsMips ) ) {

                                generateMipmap( 3553, renderTarget.texture, renderTarget.width, renderTarget.height );

                        }

                        state.bindTexture( 3553, null );

                }

                // Setup depth and stencil buffers

                if ( renderTarget.depthBuffer ) {

                        setupDepthRenderbuffer( renderTarget );

                }

        }

        function updateRenderTargetMipmap( renderTarget ) {

                const texture = renderTarget.texture;
                const supportsMips = isPowerOfTwo( renderTarget ) || isWebGL2;

                if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {

                        const target = renderTarget.isWebGLCubeRenderTarget ? 34067 : 3553;
                        const webglTexture = properties.get( texture ).__webglTexture;

                        state.bindTexture( target, webglTexture );
                        generateMipmap( target, texture, renderTarget.width, renderTarget.height );
                        state.bindTexture( target, null );

                }

        }

        function updateMultisampleRenderTarget( renderTarget ) {

                if ( renderTarget.isWebGLMultisampleRenderTarget ) {

                        if ( isWebGL2 ) {

                                const renderTargetProperties = properties.get( renderTarget );

                                _gl.bindFramebuffer( 36008, renderTargetProperties.__webglMultisampledFramebuffer );
                                _gl.bindFramebuffer( 36009, renderTargetProperties.__webglFramebuffer );

                                const width = renderTarget.width;
                                const height = renderTarget.height;
                                let mask = 16384;

                                if ( renderTarget.depthBuffer ) mask |= 256;
                                if ( renderTarget.stencilBuffer ) mask |= 1024;

                                _gl.blitFramebuffer( 0, 0, width, height, 0, 0, width, height, mask, 9728 );

                                _gl.bindFramebuffer( 36160, renderTargetProperties.__webglMultisampledFramebuffer ); // see #18905

                        } else {

                                console.warn( 'THREE.WebGLRenderer: WebGLMultisampleRenderTarget can only be used with WebGL2.' );

                        }

                }

        }

        function getRenderTargetSamples( renderTarget ) {

                return ( isWebGL2 && renderTarget.isWebGLMultisampleRenderTarget ) ?
                        Math.min( maxSamples, renderTarget.samples ) : 0;

        }

        function updateVideoTexture( texture ) {

                const frame = info.render.frame;

                // Check the last frame we updated the VideoTexture

                if ( _videoTextures.get( texture ) !== frame ) {

                        _videoTextures.set( texture, frame );
                        texture.update();

                }

        }

        // backwards compatibility

        let warnedTexture2D = false;
        let warnedTextureCube = false;

        function safeSetTexture2D( texture, slot ) {

                if ( texture && texture.isWebGLRenderTarget ) {

                        if ( warnedTexture2D === false ) {

                                console.warn( "THREE.WebGLTextures.safeSetTexture2D: don't use render targets as textures. Use their .texture property instead." );
                                warnedTexture2D = true;

                        }

                        texture = texture.texture;

                }

                setTexture2D( texture, slot );

        }

        function safeSetTextureCube( texture, slot ) {

                if ( texture && texture.isWebGLCubeRenderTarget ) {

                        if ( warnedTextureCube === false ) {

                                console.warn( "THREE.WebGLTextures.safeSetTextureCube: don't use cube render targets as textures. Use their .texture property instead." );
                                warnedTextureCube = true;

                        }

                        texture = texture.texture;

                }


                setTextureCube( texture, slot );

        }

        //

        this.allocateTextureUnit = allocateTextureUnit;
        this.resetTextureUnits = resetTextureUnits;

        this.setTexture2D = setTexture2D;
        this.setTexture2DArray = setTexture2DArray;
        this.setTexture3D = setTexture3D;
        this.setTextureCube = setTextureCube;
        this.setupRenderTarget = setupRenderTarget;
        this.updateRenderTargetMipmap = updateRenderTargetMipmap;
        this.updateMultisampleRenderTarget = updateMultisampleRenderTarget;

        this.safeSetTexture2D = safeSetTexture2D;
        this.safeSetTextureCube = safeSetTextureCube;

}

function WebGLUtils( gl, extensions, capabilities ) {

        const isWebGL2 = capabilities.isWebGL2;

        function convert( p ) {

                let extension;

                if ( p === UnsignedByteType ) return 5121;
                if ( p === UnsignedShort4444Type ) return 32819;
                if ( p === UnsignedShort5551Type ) return 32820;
                if ( p === UnsignedShort565Type ) return 33635;

                if ( p === ByteType ) return 5120;
                if ( p === ShortType ) return 5122;
                if ( p === UnsignedShortType ) return 5123;
                if ( p === IntType ) return 5124;
                if ( p === UnsignedIntType ) return 5125;
                if ( p === FloatType ) return 5126;

                if ( p === HalfFloatType ) {

                        if ( isWebGL2 ) return 5131;

                        extension = extensions.get( 'OES_texture_half_float' );

                        if ( extension !== null ) {

                                return extension.HALF_FLOAT_OES;

                        } else {

                                return null;

                        }

                }

                if ( p === AlphaFormat ) return 6406;
                if ( p === RGBFormat ) return 6407;
                if ( p === RGBAFormat ) return 6408;
                if ( p === LuminanceFormat ) return 6409;
                if ( p === LuminanceAlphaFormat ) return 6410;
                if ( p === DepthFormat ) return 6402;
                if ( p === DepthStencilFormat ) return 34041;
                if ( p === RedFormat ) return 6403;

                // WebGL2 formats.

                if ( p === RedIntegerFormat ) return 36244;
                if ( p === RGFormat ) return 33319;
                if ( p === RGIntegerFormat ) return 33320;
                if ( p === RGBIntegerFormat ) return 36248;
                if ( p === RGBAIntegerFormat ) return 36249;

                if ( p === RGB_S3TC_DXT1_Format || p === RGBA_S3TC_DXT1_Format ||
                        p === RGBA_S3TC_DXT3_Format || p === RGBA_S3TC_DXT5_Format ) {

                        extension = extensions.get( 'WEBGL_compressed_texture_s3tc' );

                        if ( extension !== null ) {

                                if ( p === RGB_S3TC_DXT1_Format ) return extension.COMPRESSED_RGB_S3TC_DXT1_EXT;
                                if ( p === RGBA_S3TC_DXT1_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT1_EXT;
                                if ( p === RGBA_S3TC_DXT3_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT3_EXT;
                                if ( p === RGBA_S3TC_DXT5_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT5_EXT;

                        } else {

                                return null;

                        }

                }

                if ( p === RGB_PVRTC_4BPPV1_Format || p === RGB_PVRTC_2BPPV1_Format ||
                        p === RGBA_PVRTC_4BPPV1_Format || p === RGBA_PVRTC_2BPPV1_Format ) {

                        extension = extensions.get( 'WEBGL_compressed_texture_pvrtc' );

                        if ( extension !== null ) {

                                if ( p === RGB_PVRTC_4BPPV1_Format ) return extension.COMPRESSED_RGB_PVRTC_4BPPV1_IMG;
                                if ( p === RGB_PVRTC_2BPPV1_Format ) return extension.COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
                                if ( p === RGBA_PVRTC_4BPPV1_Format ) return extension.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;
                                if ( p === RGBA_PVRTC_2BPPV1_Format ) return extension.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;

                        } else {

                                return null;

                        }

                }

                if ( p === RGB_ETC1_Format ) {

                        extension = extensions.get( 'WEBGL_compressed_texture_etc1' );

                        if ( extension !== null ) {

                                return extension.COMPRESSED_RGB_ETC1_WEBGL;

                        } else {

                                return null;

                        }

                }

                if ( p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format ) {

                        extension = extensions.get( 'WEBGL_compressed_texture_etc' );

                        if ( extension !== null ) {

                                if ( p === RGB_ETC2_Format ) return extension.COMPRESSED_RGB8_ETC2;
                                if ( p === RGBA_ETC2_EAC_Format ) return extension.COMPRESSED_RGBA8_ETC2_EAC;

                        }

                }

                if ( p === RGBA_ASTC_4x4_Format || p === RGBA_ASTC_5x4_Format || p === RGBA_ASTC_5x5_Format ||
                        p === RGBA_ASTC_6x5_Format || p === RGBA_ASTC_6x6_Format || p === RGBA_ASTC_8x5_Format ||
                        p === RGBA_ASTC_8x6_Format || p === RGBA_ASTC_8x8_Format || p === RGBA_ASTC_10x5_Format ||
                        p === RGBA_ASTC_10x6_Format || p === RGBA_ASTC_10x8_Format || p === RGBA_ASTC_10x10_Format ||
                        p === RGBA_ASTC_12x10_Format || p === RGBA_ASTC_12x12_Format ||
                        p === SRGB8_ALPHA8_ASTC_4x4_Format || p === SRGB8_ALPHA8_ASTC_5x4_Format || p === SRGB8_ALPHA8_ASTC_5x5_Format ||
                        p === SRGB8_ALPHA8_ASTC_6x5_Format || p === SRGB8_ALPHA8_ASTC_6x6_Format || p === SRGB8_ALPHA8_ASTC_8x5_Format ||
                        p === SRGB8_ALPHA8_ASTC_8x6_Format || p === SRGB8_ALPHA8_ASTC_8x8_Format || p === SRGB8_ALPHA8_ASTC_10x5_Format ||
                        p === SRGB8_ALPHA8_ASTC_10x6_Format || p === SRGB8_ALPHA8_ASTC_10x8_Format || p === SRGB8_ALPHA8_ASTC_10x10_Format ||
                        p === SRGB8_ALPHA8_ASTC_12x10_Format || p === SRGB8_ALPHA8_ASTC_12x12_Format ) {

                        extension = extensions.get( 'WEBGL_compressed_texture_astc' );

                        if ( extension !== null ) {

                                // TODO Complete?

                                return p;

                        } else {

                                return null;

                        }

                }

                if ( p === RGBA_BPTC_Format ) {

                        extension = extensions.get( 'EXT_texture_compression_bptc' );

                        if ( extension !== null ) {

                                // TODO Complete?

                                return p;

                        } else {

                                return null;

                        }

                }

                if ( p === UnsignedInt248Type ) {

                        if ( isWebGL2 ) return 34042;

                        extension = extensions.get( 'WEBGL_depth_texture' );

                        if ( extension !== null ) {

                                return extension.UNSIGNED_INT_24_8_WEBGL;

                        } else {

                                return null;

                        }

                }

        }

        return { convert: convert };

}

function ArrayCamera( array = [] ) {

        PerspectiveCamera.call( this );

        this.cameras = array;

}

ArrayCamera.prototype = Object.assign( Object.create( PerspectiveCamera.prototype ), {

        constructor: ArrayCamera,

        isArrayCamera: true

} );

function Group() {

        Object3D.call( this );

        this.type = 'Group';

}

Group.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: Group,

        isGroup: true

} );

function WebXRController() {

        this._targetRay = null;
        this._grip = null;
        this._hand = null;

}

Object.assign( WebXRController.prototype, {

        constructor: WebXRController,

        getHandSpace: function () {

                if ( this._hand === null ) {

                        this._hand = new Group();
                        this._hand.matrixAutoUpdate = false;
                        this._hand.visible = false;

                        this._hand.joints = [];
                        this._hand.inputState = { pinching: false };

                        if ( window.XRHand ) {

                                for ( let i = 0; i <= window.XRHand.LITTLE_PHALANX_TIP; i ++ ) {

                                        // The transform of this joint will be updated with the joint pose on each frame
                                        const joint = new Group();
                                        joint.matrixAutoUpdate = false;
                                        joint.visible = false;
                                        this._hand.joints.push( joint );
                                        // ??
                                        this._hand.add( joint );

                                }

                        }

                }

                return this._hand;

        },

        getTargetRaySpace: function () {

                if ( this._targetRay === null ) {

                        this._targetRay = new Group();
                        this._targetRay.matrixAutoUpdate = false;
                        this._targetRay.visible = false;

                }

                return this._targetRay;

        },

        getGripSpace: function () {

                if ( this._grip === null ) {

                        this._grip = new Group();
                        this._grip.matrixAutoUpdate = false;
                        this._grip.visible = false;

                }

                return this._grip;

        },

        dispatchEvent: function ( event ) {

                if ( this._targetRay !== null ) {

                        this._targetRay.dispatchEvent( event );

                }

                if ( this._grip !== null ) {

                        this._grip.dispatchEvent( event );

                }

                if ( this._hand !== null ) {

                        this._hand.dispatchEvent( event );

                }

                return this;

        },

        disconnect: function ( inputSource ) {

                this.dispatchEvent( { type: 'disconnected', data: inputSource } );

                if ( this._targetRay !== null ) {

                        this._targetRay.visible = false;

                }

                if ( this._grip !== null ) {

                        this._grip.visible = false;

                }

                if ( this._hand !== null ) {

                        this._hand.visible = false;

                }

                return this;

        },

        update: function ( inputSource, frame, referenceSpace ) {

                let inputPose = null;
                let gripPose = null;
                let handPose = null;

                const targetRay = this._targetRay;
                const grip = this._grip;
                const hand = this._hand;

                if ( inputSource && frame.session.visibilityState !== 'visible-blurred' ) {

                        if ( hand && inputSource.hand ) {

                                handPose = true;

                                for ( let i = 0; i <= window.XRHand.LITTLE_PHALANX_TIP; i ++ ) {

                                        if ( inputSource.hand[ i ] ) {

                                                // Update the joints groups with the XRJoint poses
                                                const jointPose = frame.getJointPose( inputSource.hand[ i ], referenceSpace );
                                                const joint = hand.joints[ i ];

                                                if ( jointPose !== null ) {

                                                        joint.matrix.fromArray( jointPose.transform.matrix );
                                                        joint.matrix.decompose( joint.position, joint.rotation, joint.scale );
                                                        joint.jointRadius = jointPose.radius;

                                                }

                                                joint.visible = jointPose !== null;

                                                // Custom events

                                                // Check pinch
                                                const indexTip = hand.joints[ window.XRHand.INDEX_PHALANX_TIP ];
                                                const thumbTip = hand.joints[ window.XRHand.THUMB_PHALANX_TIP ];
                                                const distance = indexTip.position.distanceTo( thumbTip.position );

                                                const distanceToPinch = 0.02;
                                                const threshold = 0.005;

                                                if ( hand.inputState.pinching && distance > distanceToPinch + threshold ) {

                                                        hand.inputState.pinching = false;
                                                        this.dispatchEvent( {
                                                                type: "pinchend",
                                                                handedness: inputSource.handedness,
                                                                target: this
                                                        } );

                                                } else if ( ! hand.inputState.pinching && distance <= distanceToPinch - threshold ) {

                                                        hand.inputState.pinching = true;
                                                        this.dispatchEvent( {
                                                                type: "pinchstart",
                                                                handedness: inputSource.handedness,
                                                                target: this
                                                        } );

                                                }

                                        }

                                }

                        } else {

                                if ( targetRay !== null ) {

                                        inputPose = frame.getPose( inputSource.targetRaySpace, referenceSpace );

                                        if ( inputPose !== null ) {

                                                targetRay.matrix.fromArray( inputPose.transform.matrix );
                                                targetRay.matrix.decompose( targetRay.position, targetRay.rotation, targetRay.scale );

                                        }

                                }

                                if ( grip !== null && inputSource.gripSpace ) {

                                        gripPose = frame.getPose( inputSource.gripSpace, referenceSpace );

                                        if ( gripPose !== null ) {

                                                grip.matrix.fromArray( gripPose.transform.matrix );
                                                grip.matrix.decompose( grip.position, grip.rotation, grip.scale );

                                        }

                                }

                        }

                }

                if ( targetRay !== null ) {

                        targetRay.visible = ( inputPose !== null );

                }

                if ( grip !== null ) {

                        grip.visible = ( gripPose !== null );

                }

                if ( hand !== null ) {

                        hand.visible = ( handPose !== null );

                }

                return this;

        }

} );

function WebXRManager( renderer, gl ) {

        const scope = this;

        let session = null;

        let framebufferScaleFactor = 1.0;

        let referenceSpace = null;
        let referenceSpaceType = 'local-floor';

        let pose = null;

        const controllers = [];
        const inputSourcesMap = new Map();

        //

        const cameraL = new PerspectiveCamera();
        cameraL.layers.enable( 1 );
        cameraL.viewport = new Vector4();

        const cameraR = new PerspectiveCamera();
        cameraR.layers.enable( 2 );
        cameraR.viewport = new Vector4();

        const cameras = [ cameraL, cameraR ];

        const cameraVR = new ArrayCamera();
        cameraVR.layers.enable( 1 );
        cameraVR.layers.enable( 2 );

        let _currentDepthNear = null;
        let _currentDepthFar = null;

        //

        this.enabled = false;

        this.isPresenting = false;

        this.getController = function ( index ) {

                let controller = controllers[ index ];

                if ( controller === undefined ) {

                        controller = new WebXRController();
                        controllers[ index ] = controller;

                }

                return controller.getTargetRaySpace();

        };

        this.getControllerGrip = function ( index ) {

                let controller = controllers[ index ];

                if ( controller === undefined ) {

                        controller = new WebXRController();
                        controllers[ index ] = controller;

                }

                return controller.getGripSpace();

        };

        this.getHand = function ( index ) {

                let controller = controllers[ index ];

                if ( controller === undefined ) {

                        controller = new WebXRController();
                        controllers[ index ] = controller;

                }

                return controller.getHandSpace();

        };

        //

        function onSessionEvent( event ) {

                const controller = inputSourcesMap.get( event.inputSource );

                if ( controller ) {

                        controller.dispatchEvent( { type: event.type, data: event.inputSource } );

                }

        }

        function onSessionEnd() {

                inputSourcesMap.forEach( function ( controller, inputSource ) {

                        controller.disconnect( inputSource );

                } );

                inputSourcesMap.clear();

                //

                renderer.setFramebuffer( null );
                renderer.setRenderTarget( renderer.getRenderTarget() ); // Hack #15830
                animation.stop();

                scope.isPresenting = false;

                scope.dispatchEvent( { type: 'sessionend' } );

        }

        function onRequestReferenceSpace( value ) {

                referenceSpace = value;

                animation.setContext( session );
                animation.start();

                scope.isPresenting = true;

                scope.dispatchEvent( { type: 'sessionstart' } );

        }

        this.setFramebufferScaleFactor = function ( value ) {

                framebufferScaleFactor = value;

                if ( scope.isPresenting === true ) {

                        console.warn( 'THREE.WebXRManager: Cannot change framebuffer scale while presenting.' );

                }

        };

        this.setReferenceSpaceType = function ( value ) {

                referenceSpaceType = value;

                if ( scope.isPresenting === true ) {

                        console.warn( 'THREE.WebXRManager: Cannot change reference space type while presenting.' );

                }

        };

        this.getReferenceSpace = function () {

                return referenceSpace;

        };

        this.getSession = function () {

                return session;

        };

        this.setSession = function ( value ) {

                session = value;

                if ( session !== null ) {

                        session.addEventListener( 'select', onSessionEvent );
                        session.addEventListener( 'selectstart', onSessionEvent );
                        session.addEventListener( 'selectend', onSessionEvent );
                        session.addEventListener( 'squeeze', onSessionEvent );
                        session.addEventListener( 'squeezestart', onSessionEvent );
                        session.addEventListener( 'squeezeend', onSessionEvent );
                        session.addEventListener( 'end', onSessionEnd );

                        const attributes = gl.getContextAttributes();

                        if ( attributes.xrCompatible !== true ) {

                                gl.makeXRCompatible();

                        }

                        const layerInit = {
                                antialias: attributes.antialias,
                                alpha: attributes.alpha,
                                depth: attributes.depth,
                                stencil: attributes.stencil,
                                framebufferScaleFactor: framebufferScaleFactor
                        };

                        // eslint-disable-next-line no-undef
                        const baseLayer = new XRWebGLLayer( session, gl, layerInit );

                        session.updateRenderState( { baseLayer: baseLayer } );

                        session.requestReferenceSpace( referenceSpaceType ).then( onRequestReferenceSpace );

                        //

                        session.addEventListener( 'inputsourceschange', updateInputSources );

                }

        };

        function updateInputSources( event ) {

                const inputSources = session.inputSources;

                // Assign inputSources to available controllers

                for ( let i = 0; i < controllers.length; i ++ ) {

                        inputSourcesMap.set( inputSources[ i ], controllers[ i ] );

                }

                // Notify disconnected

                for ( let i = 0; i < event.removed.length; i ++ ) {

                        const inputSource = event.removed[ i ];
                        const controller = inputSourcesMap.get( inputSource );

                        if ( controller ) {

                                controller.dispatchEvent( { type: 'disconnected', data: inputSource } );
                                inputSourcesMap.delete( inputSource );

                        }

                }

                // Notify connected

                for ( let i = 0; i < event.added.length; i ++ ) {

                        const inputSource = event.added[ i ];
                        const controller = inputSourcesMap.get( inputSource );

                        if ( controller ) {

                                controller.dispatchEvent( { type: 'connected', data: inputSource } );

                        }

                }

        }

        //

        const cameraLPos = new Vector3();
        const cameraRPos = new Vector3();

        /**
         * Assumes 2 cameras that are parallel and share an X-axis, and that
         * the cameras' projection and world matrices have already been set.
         * And that near and far planes are identical for both cameras.
         * Visualization of this technique: https://computergraphics.stackexchange.com/a/4765
         */
        function setProjectionFromUnion( camera, cameraL, cameraR ) {

                cameraLPos.setFromMatrixPosition( cameraL.matrixWorld );
                cameraRPos.setFromMatrixPosition( cameraR.matrixWorld );

                const ipd = cameraLPos.distanceTo( cameraRPos );

                const projL = cameraL.projectionMatrix.elements;
                const projR = cameraR.projectionMatrix.elements;

                // VR systems will have identical far and near planes, and
                // most likely identical top and bottom frustum extents.
                // Use the left camera for these values.
                const near = projL[ 14 ] / ( projL[ 10 ] - 1 );
                const far = projL[ 14 ] / ( projL[ 10 ] + 1 );
                const topFov = ( projL[ 9 ] + 1 ) / projL[ 5 ];
                const bottomFov = ( projL[ 9 ] - 1 ) / projL[ 5 ];

                const leftFov = ( projL[ 8 ] - 1 ) / projL[ 0 ];
                const rightFov = ( projR[ 8 ] + 1 ) / projR[ 0 ];
                const left = near * leftFov;
                const right = near * rightFov;

                // Calculate the new camera's position offset from the
                // left camera. xOffset should be roughly half `ipd`.
                const zOffset = ipd / ( - leftFov + rightFov );
                const xOffset = zOffset * - leftFov;

                // TODO: Better way to apply this offset?
                cameraL.matrixWorld.decompose( camera.position, camera.quaternion, camera.scale );
                camera.translateX( xOffset );
                camera.translateZ( zOffset );
                camera.matrixWorld.compose( camera.position, camera.quaternion, camera.scale );
                camera.matrixWorldInverse.copy( camera.matrixWorld ).invert();

                // Find the union of the frustum values of the cameras and scale
                // the values so that the near plane's position does not change in world space,
                // although must now be relative to the new union camera.
                const near2 = near + zOffset;
                const far2 = far + zOffset;
                const left2 = left - xOffset;
                const right2 = right + ( ipd - xOffset );
                const top2 = topFov * far / far2 * near2;
                const bottom2 = bottomFov * far / far2 * near2;

                camera.projectionMatrix.makePerspective( left2, right2, top2, bottom2, near2, far2 );

        }

        function updateCamera( camera, parent ) {

                if ( parent === null ) {

                        camera.matrixWorld.copy( camera.matrix );

                } else {

                        camera.matrixWorld.multiplyMatrices( parent.matrixWorld, camera.matrix );

                }

                camera.matrixWorldInverse.copy( camera.matrixWorld ).invert();

        }

        this.getCamera = function ( camera ) {

                cameraVR.near = cameraR.near = cameraL.near = camera.near;
                cameraVR.far = cameraR.far = cameraL.far = camera.far;

                if ( _currentDepthNear !== cameraVR.near || _currentDepthFar !== cameraVR.far ) {

                        // Note that the new renderState won't apply until the next frame. See #18320

                        session.updateRenderState( {
                                depthNear: cameraVR.near,
                                depthFar: cameraVR.far
                        } );

                        _currentDepthNear = cameraVR.near;
                        _currentDepthFar = cameraVR.far;

                }

                const parent = camera.parent;
                const cameras = cameraVR.cameras;

                updateCamera( cameraVR, parent );

                for ( let i = 0; i < cameras.length; i ++ ) {

                        updateCamera( cameras[ i ], parent );

                }

                // update camera and its children

                camera.matrixWorld.copy( cameraVR.matrixWorld );

                const children = camera.children;

                for ( let i = 0, l = children.length; i < l; i ++ ) {

                        children[ i ].updateMatrixWorld( true );

                }

                // update projection matrix for proper view frustum culling

                if ( cameras.length === 2 ) {

                        setProjectionFromUnion( cameraVR, cameraL, cameraR );

                } else {

                        // assume single camera setup (AR)

                        cameraVR.projectionMatrix.copy( cameraL.projectionMatrix );

                }

                return cameraVR;

        };

        // Animation Loop

        let onAnimationFrameCallback = null;

        function onAnimationFrame( time, frame ) {

                pose = frame.getViewerPose( referenceSpace );

                if ( pose !== null ) {

                        const views = pose.views;
                        const baseLayer = session.renderState.baseLayer;

                        renderer.setFramebuffer( baseLayer.framebuffer );

                        let cameraVRNeedsUpdate = false;

                        // check if it's necessary to rebuild cameraVR's camera list

                        if ( views.length !== cameraVR.cameras.length ) {

                                cameraVR.cameras.length = 0;
                                cameraVRNeedsUpdate = true;

                        }

                        for ( let i = 0; i < views.length; i ++ ) {

                                const view = views[ i ];
                                const viewport = baseLayer.getViewport( view );

                                const camera = cameras[ i ];
                                camera.matrix.fromArray( view.transform.matrix );
                                camera.projectionMatrix.fromArray( view.projectionMatrix );
                                camera.viewport.set( viewport.x, viewport.y, viewport.width, viewport.height );

                                if ( i === 0 ) {

                                        cameraVR.matrix.copy( camera.matrix );

                                }

                                if ( cameraVRNeedsUpdate === true ) {

                                        cameraVR.cameras.push( camera );

                                }

                        }

                }

                //

                const inputSources = session.inputSources;

                for ( let i = 0; i < controllers.length; i ++ ) {

                        const controller = controllers[ i ];
                        const inputSource = inputSources[ i ];

                        controller.update( inputSource, frame, referenceSpace );

                }

                if ( onAnimationFrameCallback ) onAnimationFrameCallback( time, frame );

        }

        const animation = new WebGLAnimation();
        animation.setAnimationLoop( onAnimationFrame );

        this.setAnimationLoop = function ( callback ) {

                onAnimationFrameCallback = callback;

        };

        this.dispose = function () {};

}

Object.assign( WebXRManager.prototype, EventDispatcher.prototype );

function WebGLMaterials( properties ) {

        function refreshFogUniforms( uniforms, fog ) {

                uniforms.fogColor.value.copy( fog.color );

                if ( fog.isFog ) {

                        uniforms.fogNear.value = fog.near;
                        uniforms.fogFar.value = fog.far;

                } else if ( fog.isFogExp2 ) {

                        uniforms.fogDensity.value = fog.density;

                }

        }

        function refreshMaterialUniforms( uniforms, material, pixelRatio, height ) {

                if ( material.isMeshBasicMaterial ) {

                        refreshUniformsCommon( uniforms, material );

                } else if ( material.isMeshLambertMaterial ) {

                        refreshUniformsCommon( uniforms, material );
                        refreshUniformsLambert( uniforms, material );

                } else if ( material.isMeshToonMaterial ) {

                        refreshUniformsCommon( uniforms, material );
                        refreshUniformsToon( uniforms, material );

                } else if ( material.isMeshPhongMaterial ) {

                        refreshUniformsCommon( uniforms, material );
                        refreshUniformsPhong( uniforms, material );

                } else if ( material.isMeshStandardMaterial ) {

                        refreshUniformsCommon( uniforms, material );

                        if ( material.isMeshPhysicalMaterial ) {

                                refreshUniformsPhysical( uniforms, material );

                        } else {

                                refreshUniformsStandard( uniforms, material );

                        }

                } else if ( material.isMeshMatcapMaterial ) {

                        refreshUniformsCommon( uniforms, material );
                        refreshUniformsMatcap( uniforms, material );

                } else if ( material.isMeshDepthMaterial ) {

                        refreshUniformsCommon( uniforms, material );
                        refreshUniformsDepth( uniforms, material );

                } else if ( material.isMeshDistanceMaterial ) {

                        refreshUniformsCommon( uniforms, material );
                        refreshUniformsDistance( uniforms, material );

                } else if ( material.isMeshNormalMaterial ) {

                        refreshUniformsCommon( uniforms, material );
                        refreshUniformsNormal( uniforms, material );

                } else if ( material.isLineBasicMaterial ) {

                        refreshUniformsLine( uniforms, material );

                        if ( material.isLineDashedMaterial ) {

                                refreshUniformsDash( uniforms, material );

                        }

                } else if ( material.isPointsMaterial ) {

                        refreshUniformsPoints( uniforms, material, pixelRatio, height );

                } else if ( material.isSpriteMaterial ) {

                        refreshUniformsSprites( uniforms, material );

                } else if ( material.isShadowMaterial ) {

                        uniforms.color.value.copy( material.color );
                        uniforms.opacity.value = material.opacity;

                } else if ( material.isShaderMaterial ) {

                        material.uniformsNeedUpdate = false; // #15581

                }

        }

        function refreshUniformsCommon( uniforms, material ) {

                uniforms.opacity.value = material.opacity;

                if ( material.color ) {

                        uniforms.diffuse.value.copy( material.color );

                }

                if ( material.emissive ) {

                        uniforms.emissive.value.copy( material.emissive ).multiplyScalar( material.emissiveIntensity );

                }

                if ( material.map ) {

                        uniforms.map.value = material.map;

                }

                if ( material.alphaMap ) {

                        uniforms.alphaMap.value = material.alphaMap;

                }

                if ( material.specularMap ) {

                        uniforms.specularMap.value = material.specularMap;

                }

                const envMap = properties.get( material ).envMap;

                if ( envMap ) {

                        uniforms.envMap.value = envMap;

                        uniforms.flipEnvMap.value = ( envMap.isCubeTexture && envMap._needsFlipEnvMap ) ? - 1 : 1;

                        uniforms.reflectivity.value = material.reflectivity;
                        uniforms.refractionRatio.value = material.refractionRatio;

                        const maxMipLevel = properties.get( envMap ).__maxMipLevel;

                        if ( maxMipLevel !== undefined ) {

                                uniforms.maxMipLevel.value = maxMipLevel;

                        }

                }

                if ( material.lightMap ) {

                        uniforms.lightMap.value = material.lightMap;
                        uniforms.lightMapIntensity.value = material.lightMapIntensity;

                }

                if ( material.aoMap ) {

                        uniforms.aoMap.value = material.aoMap;
                        uniforms.aoMapIntensity.value = material.aoMapIntensity;

                }

                // uv repeat and offset setting priorities
                // 1. color map
                // 2. specular map
                // 3. displacementMap map
                // 4. normal map
                // 5. bump map
                // 6. roughnessMap map
                // 7. metalnessMap map
                // 8. alphaMap map
                // 9. emissiveMap map
                // 10. clearcoat map
                // 11. clearcoat normal map
                // 12. clearcoat roughnessMap map

                let uvScaleMap;

                if ( material.map ) {

                        uvScaleMap = material.map;

                } else if ( material.specularMap ) {

                        uvScaleMap = material.specularMap;

                } else if ( material.displacementMap ) {

                        uvScaleMap = material.displacementMap;

                } else if ( material.normalMap ) {

                        uvScaleMap = material.normalMap;

                } else if ( material.bumpMap ) {

                        uvScaleMap = material.bumpMap;

                } else if ( material.roughnessMap ) {

                        uvScaleMap = material.roughnessMap;

                } else if ( material.metalnessMap ) {

                        uvScaleMap = material.metalnessMap;

                } else if ( material.alphaMap ) {

                        uvScaleMap = material.alphaMap;

                } else if ( material.emissiveMap ) {

                        uvScaleMap = material.emissiveMap;

                } else if ( material.clearcoatMap ) {

                        uvScaleMap = material.clearcoatMap;

                } else if ( material.clearcoatNormalMap ) {

                        uvScaleMap = material.clearcoatNormalMap;

                } else if ( material.clearcoatRoughnessMap ) {

                        uvScaleMap = material.clearcoatRoughnessMap;

                }

                if ( uvScaleMap !== undefined ) {

                        // backwards compatibility
                        if ( uvScaleMap.isWebGLRenderTarget ) {

                                uvScaleMap = uvScaleMap.texture;

                        }

                        if ( uvScaleMap.matrixAutoUpdate === true ) {

                                uvScaleMap.updateMatrix();

                        }

                        uniforms.uvTransform.value.copy( uvScaleMap.matrix );

                }

                // uv repeat and offset setting priorities for uv2
                // 1. ao map
                // 2. light map

                let uv2ScaleMap;

                if ( material.aoMap ) {

                        uv2ScaleMap = material.aoMap;

                } else if ( material.lightMap ) {

                        uv2ScaleMap = material.lightMap;

                }

                if ( uv2ScaleMap !== undefined ) {

                        // backwards compatibility
                        if ( uv2ScaleMap.isWebGLRenderTarget ) {

                                uv2ScaleMap = uv2ScaleMap.texture;

                        }

                        if ( uv2ScaleMap.matrixAutoUpdate === true ) {

                                uv2ScaleMap.updateMatrix();

                        }

                        uniforms.uv2Transform.value.copy( uv2ScaleMap.matrix );

                }

        }

        function refreshUniformsLine( uniforms, material ) {

                uniforms.diffuse.value.copy( material.color );
                uniforms.opacity.value = material.opacity;

        }

        function refreshUniformsDash( uniforms, material ) {

                uniforms.dashSize.value = material.dashSize;
                uniforms.totalSize.value = material.dashSize + material.gapSize;
                uniforms.scale.value = material.scale;

        }

        function refreshUniformsPoints( uniforms, material, pixelRatio, height ) {

                uniforms.diffuse.value.copy( material.color );
                uniforms.opacity.value = material.opacity;
                uniforms.size.value = material.size * pixelRatio;
                uniforms.scale.value = height * 0.5;

                if ( material.map ) {

                        uniforms.map.value = material.map;

                }

                if ( material.alphaMap ) {

                        uniforms.alphaMap.value = material.alphaMap;

                }

                // uv repeat and offset setting priorities
                // 1. color map
                // 2. alpha map

                let uvScaleMap;

                if ( material.map ) {

                        uvScaleMap = material.map;

                } else if ( material.alphaMap ) {

                        uvScaleMap = material.alphaMap;

                }

                if ( uvScaleMap !== undefined ) {

                        if ( uvScaleMap.matrixAutoUpdate === true ) {

                                uvScaleMap.updateMatrix();

                        }

                        uniforms.uvTransform.value.copy( uvScaleMap.matrix );

                }

        }

        function refreshUniformsSprites( uniforms, material ) {

                uniforms.diffuse.value.copy( material.color );
                uniforms.opacity.value = material.opacity;
                uniforms.rotation.value = material.rotation;

                if ( material.map ) {

                        uniforms.map.value = material.map;

                }

                if ( material.alphaMap ) {

                        uniforms.alphaMap.value = material.alphaMap;

                }

                // uv repeat and offset setting priorities
                // 1. color map
                // 2. alpha map

                let uvScaleMap;

                if ( material.map ) {

                        uvScaleMap = material.map;

                } else if ( material.alphaMap ) {

                        uvScaleMap = material.alphaMap;

                }

                if ( uvScaleMap !== undefined ) {

                        if ( uvScaleMap.matrixAutoUpdate === true ) {

                                uvScaleMap.updateMatrix();

                        }

                        uniforms.uvTransform.value.copy( uvScaleMap.matrix );

                }

        }

        function refreshUniformsLambert( uniforms, material ) {

                if ( material.emissiveMap ) {

                        uniforms.emissiveMap.value = material.emissiveMap;

                }

        }

        function refreshUniformsPhong( uniforms, material ) {

                uniforms.specular.value.copy( material.specular );
                uniforms.shininess.value = Math.max( material.shininess, 1e-4 ); // to prevent pow( 0.0, 0.0 )

                if ( material.emissiveMap ) {

                        uniforms.emissiveMap.value = material.emissiveMap;

                }

                if ( material.bumpMap ) {

                        uniforms.bumpMap.value = material.bumpMap;
                        uniforms.bumpScale.value = material.bumpScale;
                        if ( material.side === BackSide ) uniforms.bumpScale.value *= - 1;

                }

                if ( material.normalMap ) {

                        uniforms.normalMap.value = material.normalMap;
                        uniforms.normalScale.value.copy( material.normalScale );
                        if ( material.side === BackSide ) uniforms.normalScale.value.negate();

                }

                if ( material.displacementMap ) {

                        uniforms.displacementMap.value = material.displacementMap;
                        uniforms.displacementScale.value = material.displacementScale;
                        uniforms.displacementBias.value = material.displacementBias;

                }

        }

        function refreshUniformsToon( uniforms, material ) {

                if ( material.gradientMap ) {

                        uniforms.gradientMap.value = material.gradientMap;

                }

                if ( material.emissiveMap ) {

                        uniforms.emissiveMap.value = material.emissiveMap;

                }

                if ( material.bumpMap ) {

                        uniforms.bumpMap.value = material.bumpMap;
                        uniforms.bumpScale.value = material.bumpScale;
                        if ( material.side === BackSide ) uniforms.bumpScale.value *= - 1;

                }

                if ( material.normalMap ) {

                        uniforms.normalMap.value = material.normalMap;
                        uniforms.normalScale.value.copy( material.normalScale );
                        if ( material.side === BackSide ) uniforms.normalScale.value.negate();

                }

                if ( material.displacementMap ) {

                        uniforms.displacementMap.value = material.displacementMap;
                        uniforms.displacementScale.value = material.displacementScale;
                        uniforms.displacementBias.value = material.displacementBias;

                }

        }

        function refreshUniformsStandard( uniforms, material ) {

                uniforms.roughness.value = material.roughness;
                uniforms.metalness.value = material.metalness;

                if ( material.roughnessMap ) {

                        uniforms.roughnessMap.value = material.roughnessMap;

                }

                if ( material.metalnessMap ) {

                        uniforms.metalnessMap.value = material.metalnessMap;

                }

                if ( material.emissiveMap ) {

                        uniforms.emissiveMap.value = material.emissiveMap;

                }

                if ( material.bumpMap ) {

                        uniforms.bumpMap.value = material.bumpMap;
                        uniforms.bumpScale.value = material.bumpScale;
                        if ( material.side === BackSide ) uniforms.bumpScale.value *= - 1;

                }

                if ( material.normalMap ) {

                        uniforms.normalMap.value = material.normalMap;
                        uniforms.normalScale.value.copy( material.normalScale );
                        if ( material.side === BackSide ) uniforms.normalScale.value.negate();

                }

                if ( material.displacementMap ) {

                        uniforms.displacementMap.value = material.displacementMap;
                        uniforms.displacementScale.value = material.displacementScale;
                        uniforms.displacementBias.value = material.displacementBias;

                }

                const envMap = properties.get( material ).envMap;

                if ( envMap ) {

                        //uniforms.envMap.value = material.envMap; // part of uniforms common
                        uniforms.envMapIntensity.value = material.envMapIntensity;

                }

        }

        function refreshUniformsPhysical( uniforms, material ) {

                refreshUniformsStandard( uniforms, material );

                uniforms.reflectivity.value = material.reflectivity; // also part of uniforms common

                uniforms.clearcoat.value = material.clearcoat;
                uniforms.clearcoatRoughness.value = material.clearcoatRoughness;
                if ( material.sheen ) uniforms.sheen.value.copy( material.sheen );

                if ( material.clearcoatMap ) {

                        uniforms.clearcoatMap.value = material.clearcoatMap;

                }

                if ( material.clearcoatRoughnessMap ) {

                        uniforms.clearcoatRoughnessMap.value = material.clearcoatRoughnessMap;

                }

                if ( material.clearcoatNormalMap ) {

                        uniforms.clearcoatNormalScale.value.copy( material.clearcoatNormalScale );
                        uniforms.clearcoatNormalMap.value = material.clearcoatNormalMap;

                        if ( material.side === BackSide ) {

                                uniforms.clearcoatNormalScale.value.negate();

                        }

                }

                uniforms.transmission.value = material.transmission;

                if ( material.transmissionMap ) {

                        uniforms.transmissionMap.value = material.transmissionMap;

                }

        }

        function refreshUniformsMatcap( uniforms, material ) {

                if ( material.matcap ) {

                        uniforms.matcap.value = material.matcap;

                }

                if ( material.bumpMap ) {

                        uniforms.bumpMap.value = material.bumpMap;
                        uniforms.bumpScale.value = material.bumpScale;
                        if ( material.side === BackSide ) uniforms.bumpScale.value *= - 1;

                }

                if ( material.normalMap ) {

                        uniforms.normalMap.value = material.normalMap;
                        uniforms.normalScale.value.copy( material.normalScale );
                        if ( material.side === BackSide ) uniforms.normalScale.value.negate();

                }

                if ( material.displacementMap ) {

                        uniforms.displacementMap.value = material.displacementMap;
                        uniforms.displacementScale.value = material.displacementScale;
                        uniforms.displacementBias.value = material.displacementBias;

                }

        }

        function refreshUniformsDepth( uniforms, material ) {

                if ( material.displacementMap ) {

                        uniforms.displacementMap.value = material.displacementMap;
                        uniforms.displacementScale.value = material.displacementScale;
                        uniforms.displacementBias.value = material.displacementBias;

                }

        }

        function refreshUniformsDistance( uniforms, material ) {

                if ( material.displacementMap ) {

                        uniforms.displacementMap.value = material.displacementMap;
                        uniforms.displacementScale.value = material.displacementScale;
                        uniforms.displacementBias.value = material.displacementBias;

                }

                uniforms.referencePosition.value.copy( material.referencePosition );
                uniforms.nearDistance.value = material.nearDistance;
                uniforms.farDistance.value = material.farDistance;

        }

        function refreshUniformsNormal( uniforms, material ) {

                if ( material.bumpMap ) {

                        uniforms.bumpMap.value = material.bumpMap;
                        uniforms.bumpScale.value = material.bumpScale;
                        if ( material.side === BackSide ) uniforms.bumpScale.value *= - 1;

                }

                if ( material.normalMap ) {

                        uniforms.normalMap.value = material.normalMap;
                        uniforms.normalScale.value.copy( material.normalScale );
                        if ( material.side === BackSide ) uniforms.normalScale.value.negate();

                }

                if ( material.displacementMap ) {

                        uniforms.displacementMap.value = material.displacementMap;
                        uniforms.displacementScale.value = material.displacementScale;
                        uniforms.displacementBias.value = material.displacementBias;

                }

        }

        return {
                refreshFogUniforms: refreshFogUniforms,
                refreshMaterialUniforms: refreshMaterialUniforms
        };

}

function createCanvasElement() {

        const canvas = document.createElementNS( 'http://www.w3.org/1999/xhtml', 'canvas' );
        canvas.style.display = 'block';
        return canvas;

}

function WebGLRenderer( parameters ) {

        parameters = parameters || {};

        const _canvas = parameters.canvas !== undefined ? parameters.canvas : createCanvasElement(),
                _context = parameters.context !== undefined ? parameters.context : null,

                _alpha = parameters.alpha !== undefined ? parameters.alpha : false,
                _depth = parameters.depth !== undefined ? parameters.depth : true,
                _stencil = parameters.stencil !== undefined ? parameters.stencil : true,
                _antialias = parameters.antialias !== undefined ? parameters.antialias : false,
                _premultipliedAlpha = parameters.premultipliedAlpha !== undefined ? parameters.premultipliedAlpha : true,
                _preserveDrawingBuffer = parameters.preserveDrawingBuffer !== undefined ? parameters.preserveDrawingBuffer : false,
                _powerPreference = parameters.powerPreference !== undefined ? parameters.powerPreference : 'default',
                _failIfMajorPerformanceCaveat = parameters.failIfMajorPerformanceCaveat !== undefined ? parameters.failIfMajorPerformanceCaveat : false;

        let currentRenderList = null;
        let currentRenderState = null;

        // public properties

        this.domElement = _canvas;

        // Debug configuration container
        this.debug = {

                /**
                 * Enables error checking and reporting when shader programs are being compiled
                 * @type {boolean}
                 */
                checkShaderErrors: true
        };

        // clearing

        this.autoClear = true;
        this.autoClearColor = true;
        this.autoClearDepth = true;
        this.autoClearStencil = true;

        // scene graph

        this.sortObjects = true;

        // user-defined clipping

        this.clippingPlanes = [];
        this.localClippingEnabled = false;

        // physically based shading

        this.gammaFactor = 2.0; // for backwards compatibility
        this.outputEncoding = LinearEncoding;

        // physical lights

        this.physicallyCorrectLights = false;

        // tone mapping

        this.toneMapping = NoToneMapping;
        this.toneMappingExposure = 1.0;

        // morphs

        this.maxMorphTargets = 8;
        this.maxMorphNormals = 4;

        // internal properties

        const _this = this;

        let _isContextLost = false;

        // internal state cache

        let _framebuffer = null;

        let _currentActiveCubeFace = 0;
        let _currentActiveMipmapLevel = 0;
        let _currentRenderTarget = null;
        let _currentFramebuffer = null;
        let _currentMaterialId = - 1;

        let _currentCamera = null;
        let _currentArrayCamera = null;

        const _currentViewport = new Vector4();
        const _currentScissor = new Vector4();
        let _currentScissorTest = null;

        //

        let _width = _canvas.width;
        let _height = _canvas.height;

        let _pixelRatio = 1;
        let _opaqueSort = null;
        let _transparentSort = null;

        const _viewport = new Vector4( 0, 0, _width, _height );
        const _scissor = new Vector4( 0, 0, _width, _height );
        let _scissorTest = false;

        // frustum

        const _frustum = new Frustum();

        // clipping

        let _clippingEnabled = false;
        let _localClippingEnabled = false;

        // camera matrices cache

        const _projScreenMatrix = new Matrix4();

        const _vector3 = new Vector3();

        const _emptyScene = { background: null, fog: null, environment: null, overrideMaterial: null, isScene: true };

        function getTargetPixelRatio() {

                return _currentRenderTarget === null ? _pixelRatio : 1;

        }

        // initialize

        let _gl = _context;

        function getContext( contextNames, contextAttributes ) {

                for ( let i = 0; i < contextNames.length; i ++ ) {

                        const contextName = contextNames[ i ];
                        const context = _canvas.getContext( contextName, contextAttributes );
                        if ( context !== null ) return context;

                }

                return null;

        }

        try {

                const contextAttributes = {
                        alpha: _alpha,
                        depth: _depth,
                        stencil: _stencil,
                        antialias: _antialias,
                        premultipliedAlpha: _premultipliedAlpha,
                        preserveDrawingBuffer: _preserveDrawingBuffer,
                        powerPreference: _powerPreference,
                        failIfMajorPerformanceCaveat: _failIfMajorPerformanceCaveat
                };

                // event listeners must be registered before WebGL context is created, see #12753

                _canvas.addEventListener( 'webglcontextlost', onContextLost, false );
                _canvas.addEventListener( 'webglcontextrestored', onContextRestore, false );

                if ( _gl === null ) {

                        const contextNames = [ 'webgl2', 'webgl', 'experimental-webgl' ];

                        if ( _this.isWebGL1Renderer === true ) {

                                contextNames.shift();

                        }

                        _gl = getContext( contextNames, contextAttributes );

                        if ( _gl === null ) {

                                if ( getContext( contextNames ) ) {

                                        throw new Error( 'Error creating WebGL context with your selected attributes.' );

                                } else {

                                        throw new Error( 'Error creating WebGL context.' );

                                }

                        }

                }

                // Some experimental-webgl implementations do not have getShaderPrecisionFormat

                if ( _gl.getShaderPrecisionFormat === undefined ) {

                        _gl.getShaderPrecisionFormat = function () {

                                return { 'rangeMin': 1, 'rangeMax': 1, 'precision': 1 };

                        };

                }

        } catch ( error ) {

                console.error( 'THREE.WebGLRenderer: ' + error.message );
                throw error;

        }

        let extensions, capabilities, state, info;
        let properties, textures, cubemaps, attributes, geometries, objects;
        let programCache, materials, renderLists, renderStates, clipping;

        let background, morphtargets, bufferRenderer, indexedBufferRenderer;

        let utils, bindingStates;

        function initGLContext() {

                extensions = new WebGLExtensions( _gl );

                capabilities = new WebGLCapabilities( _gl, extensions, parameters );

                if ( capabilities.isWebGL2 === false ) {

                        extensions.get( 'WEBGL_depth_texture' );
                        extensions.get( 'OES_texture_float' );
                        extensions.get( 'OES_texture_half_float' );
                        extensions.get( 'OES_texture_half_float_linear' );
                        extensions.get( 'OES_standard_derivatives' );
                        extensions.get( 'OES_element_index_uint' );
                        extensions.get( 'OES_vertex_array_object' );
                        extensions.get( 'ANGLE_instanced_arrays' );

                }

                extensions.get( 'OES_texture_float_linear' );

                utils = new WebGLUtils( _gl, extensions, capabilities );

                state = new WebGLState( _gl, extensions, capabilities );
                state.scissor( _currentScissor.copy( _scissor ).multiplyScalar( _pixelRatio ).floor() );
                state.viewport( _currentViewport.copy( _viewport ).multiplyScalar( _pixelRatio ).floor() );

                info = new WebGLInfo( _gl );
                properties = new WebGLProperties();
                textures = new WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info );
                cubemaps = new WebGLCubeMaps( _this );
                attributes = new WebGLAttributes( _gl, capabilities );
                bindingStates = new WebGLBindingStates( _gl, extensions, attributes, capabilities );
                geometries = new WebGLGeometries( _gl, attributes, info, bindingStates );
                objects = new WebGLObjects( _gl, geometries, attributes, info );
                morphtargets = new WebGLMorphtargets( _gl );
                clipping = new WebGLClipping( properties );
                programCache = new WebGLPrograms( _this, cubemaps, extensions, capabilities, bindingStates, clipping );
                materials = new WebGLMaterials( properties );
                renderLists = new WebGLRenderLists( properties );
                renderStates = new WebGLRenderStates( extensions, capabilities );
                background = new WebGLBackground( _this, cubemaps, state, objects, _premultipliedAlpha );

                bufferRenderer = new WebGLBufferRenderer( _gl, extensions, info, capabilities );
                indexedBufferRenderer = new WebGLIndexedBufferRenderer( _gl, extensions, info, capabilities );

                info.programs = programCache.programs;

                _this.capabilities = capabilities;
                _this.extensions = extensions;
                _this.properties = properties;
                _this.renderLists = renderLists;
                _this.state = state;
                _this.info = info;

        }

        initGLContext();

        // xr

        const xr = new WebXRManager( _this, _gl );

        this.xr = xr;

        // shadow map

        const shadowMap = new WebGLShadowMap( _this, objects, capabilities.maxTextureSize );

        this.shadowMap = shadowMap;

        // API

        this.getContext = function () {

                return _gl;

        };

        this.getContextAttributes = function () {

                return _gl.getContextAttributes();

        };

        this.forceContextLoss = function () {

                const extension = extensions.get( 'WEBGL_lose_context' );
                if ( extension ) extension.loseContext();

        };

        this.forceContextRestore = function () {

                const extension = extensions.get( 'WEBGL_lose_context' );
                if ( extension ) extension.restoreContext();

        };

        this.getPixelRatio = function () {

                return _pixelRatio;

        };

        this.setPixelRatio = function ( value ) {

                if ( value === undefined ) return;

                _pixelRatio = value;

                this.setSize( _width, _height, false );

        };

        this.getSize = function ( target ) {

                if ( target === undefined ) {

                        console.warn( 'WebGLRenderer: .getsize() now requires a Vector2 as an argument' );

                        target = new Vector2();

                }

                return target.set( _width, _height );

        };

        this.setSize = function ( width, height, updateStyle ) {

                if ( xr.isPresenting ) {

                        console.warn( 'THREE.WebGLRenderer: Can\'t change size while VR device is presenting.' );
                        return;

                }

                _width = width;
                _height = height;

                _canvas.width = Math.floor( width * _pixelRatio );
                _canvas.height = Math.floor( height * _pixelRatio );

                if ( updateStyle !== false ) {

                        _canvas.style.width = width + 'px';
                        _canvas.style.height = height + 'px';

                }

                this.setViewport( 0, 0, width, height );

        };

        this.getDrawingBufferSize = function ( target ) {

                if ( target === undefined ) {

                        console.warn( 'WebGLRenderer: .getdrawingBufferSize() now requires a Vector2 as an argument' );

                        target = new Vector2();

                }

                return target.set( _width * _pixelRatio, _height * _pixelRatio ).floor();

        };

        this.setDrawingBufferSize = function ( width, height, pixelRatio ) {

                _width = width;
                _height = height;

                _pixelRatio = pixelRatio;

                _canvas.width = Math.floor( width * pixelRatio );
                _canvas.height = Math.floor( height * pixelRatio );

                this.setViewport( 0, 0, width, height );

        };

        this.getCurrentViewport = function ( target ) {

                if ( target === undefined ) {

                        console.warn( 'WebGLRenderer: .getCurrentViewport() now requires a Vector4 as an argument' );

                        target = new Vector4();

                }

                return target.copy( _currentViewport );

        };

        this.getViewport = function ( target ) {

                return target.copy( _viewport );

        };

        this.setViewport = function ( x, y, width, height ) {

                if ( x.isVector4 ) {

                        _viewport.set( x.x, x.y, x.z, x.w );

                } else {

                        _viewport.set( x, y, width, height );

                }

                state.viewport( _currentViewport.copy( _viewport ).multiplyScalar( _pixelRatio ).floor() );

        };

        this.getScissor = function ( target ) {

                return target.copy( _scissor );

        };

        this.setScissor = function ( x, y, width, height ) {

                if ( x.isVector4 ) {

                        _scissor.set( x.x, x.y, x.z, x.w );

                } else {

                        _scissor.set( x, y, width, height );

                }

                state.scissor( _currentScissor.copy( _scissor ).multiplyScalar( _pixelRatio ).floor() );

        };

        this.getScissorTest = function () {

                return _scissorTest;

        };

        this.setScissorTest = function ( boolean ) {

                state.setScissorTest( _scissorTest = boolean );

        };

        this.setOpaqueSort = function ( method ) {

                _opaqueSort = method;

        };

        this.setTransparentSort = function ( method ) {

                _transparentSort = method;

        };

        // Clearing

        this.getClearColor = function () {

                return background.getClearColor();

        };

        this.setClearColor = function () {

                background.setClearColor.apply( background, arguments );

        };

        this.getClearAlpha = function () {

                return background.getClearAlpha();

        };

        this.setClearAlpha = function () {

                background.setClearAlpha.apply( background, arguments );

        };

        this.clear = function ( color, depth, stencil ) {

                let bits = 0;

                if ( color === undefined || color ) bits |= 16384;
                if ( depth === undefined || depth ) bits |= 256;
                if ( stencil === undefined || stencil ) bits |= 1024;

                _gl.clear( bits );

        };

        this.clearColor = function () {

                this.clear( true, false, false );

        };

        this.clearDepth = function () {

                this.clear( false, true, false );

        };

        this.clearStencil = function () {

                this.clear( false, false, true );

        };

        //

        this.dispose = function () {

                _canvas.removeEventListener( 'webglcontextlost', onContextLost, false );
                _canvas.removeEventListener( 'webglcontextrestored', onContextRestore, false );

                renderLists.dispose();
                renderStates.dispose();
                properties.dispose();
                cubemaps.dispose();
                objects.dispose();
                bindingStates.dispose();

                xr.dispose();

                animation.stop();

        };

        // Events

        function onContextLost( event ) {

                event.preventDefault();

                console.log( 'THREE.WebGLRenderer: Context Lost.' );

                _isContextLost = true;

        }

        function onContextRestore( /* event */ ) {

                console.log( 'THREE.WebGLRenderer: Context Restored.' );

                _isContextLost = false;

                initGLContext();

        }

        function onMaterialDispose( event ) {

                const material = event.target;

                material.removeEventListener( 'dispose', onMaterialDispose );

                deallocateMaterial( material );

        }

        // Buffer deallocation

        function deallocateMaterial( material ) {

                releaseMaterialProgramReference( material );

                properties.remove( material );

        }


        function releaseMaterialProgramReference( material ) {

                const programInfo = properties.get( material ).program;

                if ( programInfo !== undefined ) {

                        programCache.releaseProgram( programInfo );

                }

        }

        // Buffer rendering

        function renderObjectImmediate( object, program ) {

                object.render( function ( object ) {

                        _this.renderBufferImmediate( object, program );

                } );

        }

        this.renderBufferImmediate = function ( object, program ) {

                bindingStates.initAttributes();

                const buffers = properties.get( object );

                if ( object.hasPositions && ! buffers.position ) buffers.position = _gl.createBuffer();
                if ( object.hasNormals && ! buffers.normal ) buffers.normal = _gl.createBuffer();
                if ( object.hasUvs && ! buffers.uv ) buffers.uv = _gl.createBuffer();
                if ( object.hasColors && ! buffers.color ) buffers.color = _gl.createBuffer();

                const programAttributes = program.getAttributes();

                if ( object.hasPositions ) {

                        _gl.bindBuffer( 34962, buffers.position );
                        _gl.bufferData( 34962, object.positionArray, 35048 );

                        bindingStates.enableAttribute( programAttributes.position );
                        _gl.vertexAttribPointer( programAttributes.position, 3, 5126, false, 0, 0 );

                }

                if ( object.hasNormals ) {

                        _gl.bindBuffer( 34962, buffers.normal );
                        _gl.bufferData( 34962, object.normalArray, 35048 );

                        bindingStates.enableAttribute( programAttributes.normal );
                        _gl.vertexAttribPointer( programAttributes.normal, 3, 5126, false, 0, 0 );

                }

                if ( object.hasUvs ) {

                        _gl.bindBuffer( 34962, buffers.uv );
                        _gl.bufferData( 34962, object.uvArray, 35048 );

                        bindingStates.enableAttribute( programAttributes.uv );
                        _gl.vertexAttribPointer( programAttributes.uv, 2, 5126, false, 0, 0 );

                }

                if ( object.hasColors ) {

                        _gl.bindBuffer( 34962, buffers.color );
                        _gl.bufferData( 34962, object.colorArray, 35048 );

                        bindingStates.enableAttribute( programAttributes.color );
                        _gl.vertexAttribPointer( programAttributes.color, 3, 5126, false, 0, 0 );

                }

                bindingStates.disableUnusedAttributes();

                _gl.drawArrays( 4, 0, object.count );

                object.count = 0;

        };

        this.renderBufferDirect = function ( camera, scene, geometry, material, object, group ) {

                if ( scene === null ) scene = _emptyScene; // renderBufferDirect second parameter used to be fog (could be null)

                const frontFaceCW = ( object.isMesh && object.matrixWorld.determinant() < 0 );

                const program = setProgram( camera, scene, material, object );

                state.setMaterial( material, frontFaceCW );

                //

                let index = geometry.index;
                const position = geometry.attributes.position;

                //

                if ( index === null ) {

                        if ( position === undefined || position.count === 0 ) return;

                } else if ( index.count === 0 ) {

                        return;

                }

                //

                let rangeFactor = 1;

                if ( material.wireframe === true ) {

                        index = geometries.getWireframeAttribute( geometry );
                        rangeFactor = 2;

                }

                if ( material.morphTargets || material.morphNormals ) {

                        morphtargets.update( object, geometry, material, program );

                }

                bindingStates.setup( object, material, program, geometry, index );

                let attribute;
                let renderer = bufferRenderer;

                if ( index !== null ) {

                        attribute = attributes.get( index );

                        renderer = indexedBufferRenderer;
                        renderer.setIndex( attribute );

                }

                //

                const dataCount = ( index !== null ) ? index.count : position.count;

                const rangeStart = geometry.drawRange.start * rangeFactor;
                const rangeCount = geometry.drawRange.count * rangeFactor;

                const groupStart = group !== null ? group.start * rangeFactor : 0;
                const groupCount = group !== null ? group.count * rangeFactor : Infinity;

                const drawStart = Math.max( rangeStart, groupStart );
                const drawEnd = Math.min( dataCount, rangeStart + rangeCount, groupStart + groupCount ) - 1;

                const drawCount = Math.max( 0, drawEnd - drawStart + 1 );

                if ( drawCount === 0 ) return;

                //

                if ( object.isMesh ) {

                        if ( material.wireframe === true ) {

                                state.setLineWidth( material.wireframeLinewidth * getTargetPixelRatio() );
                                renderer.setMode( 1 );

                        } else {

                                renderer.setMode( 4 );

                        }

                } else if ( object.isLine ) {

                        let lineWidth = material.linewidth;

                        if ( lineWidth === undefined ) lineWidth = 1; // Not using Line*Material

                        state.setLineWidth( lineWidth * getTargetPixelRatio() );

                        if ( object.isLineSegments ) {

                                renderer.setMode( 1 );

                        } else if ( object.isLineLoop ) {

                                renderer.setMode( 2 );

                        } else {

                                renderer.setMode( 3 );

                        }

                } else if ( object.isPoints ) {

                        renderer.setMode( 0 );

                } else if ( object.isSprite ) {

                        renderer.setMode( 4 );

                }

                if ( object.isInstancedMesh ) {

                        renderer.renderInstances( drawStart, drawCount, object.count );

                } else if ( geometry.isInstancedBufferGeometry ) {

                        const instanceCount = Math.min( geometry.instanceCount, geometry._maxInstanceCount );

                        renderer.renderInstances( drawStart, drawCount, instanceCount );

                } else {

                        renderer.render( drawStart, drawCount );

                }

        };

        // Compile

        this.compile = function ( scene, camera ) {

                currentRenderState = renderStates.get( scene, camera );
                currentRenderState.init();

                scene.traverseVisible( function ( object ) {

                        if ( object.isLight && object.layers.test( camera.layers ) ) {

                                currentRenderState.pushLight( object );

                                if ( object.castShadow ) {

                                        currentRenderState.pushShadow( object );

                                }

                        }

                } );

                currentRenderState.setupLights( camera );

                const compiled = new WeakMap();

                scene.traverse( function ( object ) {

                        const material = object.material;

                        if ( material ) {

                                if ( Array.isArray( material ) ) {

                                        for ( let i = 0; i < material.length; i ++ ) {

                                                const material2 = material[ i ];

                                                if ( compiled.has( material2 ) === false ) {

                                                        initMaterial( material2, scene, object );
                                                        compiled.set( material2 );

                                                }

                                        }

                                } else if ( compiled.has( material ) === false ) {

                                        initMaterial( material, scene, object );
                                        compiled.set( material );

                                }

                        }

                } );

        };

        // Animation Loop

        let onAnimationFrameCallback = null;

        function onAnimationFrame( time ) {

                if ( xr.isPresenting ) return;
                if ( onAnimationFrameCallback ) onAnimationFrameCallback( time );

        }

        const animation = new WebGLAnimation();
        animation.setAnimationLoop( onAnimationFrame );

        if ( typeof window !== 'undefined' ) animation.setContext( window );

        this.setAnimationLoop = function ( callback ) {

                onAnimationFrameCallback = callback;
                xr.setAnimationLoop( callback );

                ( callback === null ) ? animation.stop() : animation.start();

        };

        // Rendering

        this.render = function ( scene, camera ) {

                let renderTarget, forceClear;

                if ( arguments[ 2 ] !== undefined ) {

                        console.warn( 'THREE.WebGLRenderer.render(): the renderTarget argument has been removed. Use .setRenderTarget() instead.' );
                        renderTarget = arguments[ 2 ];

                }

                if ( arguments[ 3 ] !== undefined ) {

                        console.warn( 'THREE.WebGLRenderer.render(): the forceClear argument has been removed. Use .clear() instead.' );
                        forceClear = arguments[ 3 ];

                }

                if ( camera !== undefined && camera.isCamera !== true ) {

                        console.error( 'THREE.WebGLRenderer.render: camera is not an instance of THREE.Camera.' );
                        return;

                }

                if ( _isContextLost === true ) return;

                // reset caching for this frame

                bindingStates.resetDefaultState();
                _currentMaterialId = - 1;
                _currentCamera = null;

                // update scene graph

                if ( scene.autoUpdate === true ) scene.updateMatrixWorld();

                // update camera matrices and frustum

                if ( camera.parent === null ) camera.updateMatrixWorld();

                if ( xr.enabled === true && xr.isPresenting === true ) {

                        camera = xr.getCamera( camera );

                }

                //
                if ( scene.isScene === true ) scene.onBeforeRender( _this, scene, camera, renderTarget || _currentRenderTarget );

                currentRenderState = renderStates.get( scene, camera );
                currentRenderState.init();

                _projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
                _frustum.setFromProjectionMatrix( _projScreenMatrix );

                _localClippingEnabled = this.localClippingEnabled;
                _clippingEnabled = clipping.init( this.clippingPlanes, _localClippingEnabled, camera );

                currentRenderList = renderLists.get( scene, camera );
                currentRenderList.init();

                projectObject( scene, camera, 0, _this.sortObjects );

                currentRenderList.finish();

                if ( _this.sortObjects === true ) {

                        currentRenderList.sort( _opaqueSort, _transparentSort );

                }

                //

                if ( _clippingEnabled === true ) clipping.beginShadows();

                const shadowsArray = currentRenderState.state.shadowsArray;

                shadowMap.render( shadowsArray, scene, camera );

                currentRenderState.setupLights( camera );

                if ( _clippingEnabled === true ) clipping.endShadows();

                //

                if ( this.info.autoReset === true ) this.info.reset();

                if ( renderTarget !== undefined ) {

                        this.setRenderTarget( renderTarget );

                }

                //

                background.render( currentRenderList, scene, camera, forceClear );

                // render scene

                const opaqueObjects = currentRenderList.opaque;
                const transparentObjects = currentRenderList.transparent;

                if ( opaqueObjects.length > 0 ) renderObjects( opaqueObjects, scene, camera );
                if ( transparentObjects.length > 0 ) renderObjects( transparentObjects, scene, camera );

                //

                if ( scene.isScene === true ) scene.onAfterRender( _this, scene, camera );

                //

                if ( _currentRenderTarget !== null ) {

                        // Generate mipmap if we're using any kind of mipmap filtering

                        textures.updateRenderTargetMipmap( _currentRenderTarget );

                        // resolve multisample renderbuffers to a single-sample texture if necessary

                        textures.updateMultisampleRenderTarget( _currentRenderTarget );

                }

                // Ensure depth buffer writing is enabled so it can be cleared on next render

                state.buffers.depth.setTest( true );
                state.buffers.depth.setMask( true );
                state.buffers.color.setMask( true );

                state.setPolygonOffset( false );

                // _gl.finish();

                currentRenderList = null;
                currentRenderState = null;

        };

        function projectObject( object, camera, groupOrder, sortObjects ) {

                if ( object.visible === false ) return;

                const visible = object.layers.test( camera.layers );

                if ( visible ) {

                        if ( object.isGroup ) {

                                groupOrder = object.renderOrder;

                        } else if ( object.isLOD ) {

                                if ( object.autoUpdate === true ) object.update( camera );

                        } else if ( object.isLight ) {

                                currentRenderState.pushLight( object );

                                if ( object.castShadow ) {

                                        currentRenderState.pushShadow( object );

                                }

                        } else if ( object.isSprite ) {

                                if ( ! object.frustumCulled || _frustum.intersectsSprite( object ) ) {

                                        if ( sortObjects ) {

                                                _vector3.setFromMatrixPosition( object.matrixWorld )
                                                        .applyMatrix4( _projScreenMatrix );

                                        }

                                        const geometry = objects.update( object );
                                        const material = object.material;

                                        if ( material.visible ) {

                                                currentRenderList.push( object, geometry, material, groupOrder, _vector3.z, null );

                                        }

                                }

                        } else if ( object.isImmediateRenderObject ) {

                                if ( sortObjects ) {

                                        _vector3.setFromMatrixPosition( object.matrixWorld )
                                                .applyMatrix4( _projScreenMatrix );

                                }

                                currentRenderList.push( object, null, object.material, groupOrder, _vector3.z, null );

                        } else if ( object.isMesh || object.isLine || object.isPoints ) {

                                if ( object.isSkinnedMesh ) {

                                        // update skeleton only once in a frame

                                        if ( object.skeleton.frame !== info.render.frame ) {

                                                object.skeleton.update();
                                                object.skeleton.frame = info.render.frame;

                                        }

                                }

                                if ( ! object.frustumCulled || _frustum.intersectsObject( object ) ) {

                                        if ( sortObjects ) {

                                                _vector3.setFromMatrixPosition( object.matrixWorld )
                                                        .applyMatrix4( _projScreenMatrix );

                                        }

                                        const geometry = objects.update( object );
                                        const material = object.material;

                                        if ( Array.isArray( material ) ) {

                                                const groups = geometry.groups;

                                                for ( let i = 0, l = groups.length; i < l; i ++ ) {

                                                        const group = groups[ i ];
                                                        const groupMaterial = material[ group.materialIndex ];

                                                        if ( groupMaterial && groupMaterial.visible ) {

                                                                currentRenderList.push( object, geometry, groupMaterial, groupOrder, _vector3.z, group );

                                                        }

                                                }

                                        } else if ( material.visible ) {

                                                currentRenderList.push( object, geometry, material, groupOrder, _vector3.z, null );

                                        }

                                }

                        }

                }

                const children = object.children;

                for ( let i = 0, l = children.length; i < l; i ++ ) {

                        projectObject( children[ i ], camera, groupOrder, sortObjects );

                }

        }

        function renderObjects( renderList, scene, camera ) {

                const overrideMaterial = scene.isScene === true ? scene.overrideMaterial : null;

                for ( let i = 0, l = renderList.length; i < l; i ++ ) {

                        const renderItem = renderList[ i ];

                        const object = renderItem.object;
                        const geometry = renderItem.geometry;
                        const material = overrideMaterial === null ? renderItem.material : overrideMaterial;
                        const group = renderItem.group;

                        if ( camera.isArrayCamera ) {

                                _currentArrayCamera = camera;

                                const cameras = camera.cameras;

                                for ( let j = 0, jl = cameras.length; j < jl; j ++ ) {

                                        const camera2 = cameras[ j ];

                                        if ( object.layers.test( camera2.layers ) ) {

                                                state.viewport( _currentViewport.copy( camera2.viewport ) );

                                                currentRenderState.setupLights( camera2 );

                                                renderObject( object, scene, camera2, geometry, material, group );

                                        }

                                }

                        } else {

                                _currentArrayCamera = null;

                                renderObject( object, scene, camera, geometry, material, group );

                        }

                }

        }

        function renderObject( object, scene, camera, geometry, material, group ) {

                object.onBeforeRender( _this, scene, camera, geometry, material, group );
                currentRenderState = renderStates.get( scene, _currentArrayCamera || camera );

                object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );
                object.normalMatrix.getNormalMatrix( object.modelViewMatrix );

                if ( object.isImmediateRenderObject ) {

                        const program = setProgram( camera, scene, material, object );

                        state.setMaterial( material );

                        bindingStates.reset();

                        renderObjectImmediate( object, program );

                } else {

                        _this.renderBufferDirect( camera, scene, geometry, material, object, group );

                }

                object.onAfterRender( _this, scene, camera, geometry, material, group );
                currentRenderState = renderStates.get( scene, _currentArrayCamera || camera );

        }

        function initMaterial( material, scene, object ) {

                if ( scene.isScene !== true ) scene = _emptyScene; // scene could be a Mesh, Line, Points, ...

                const materialProperties = properties.get( material );

                const lights = currentRenderState.state.lights;
                const shadowsArray = currentRenderState.state.shadowsArray;

                const lightsStateVersion = lights.state.version;

                const parameters = programCache.getParameters( material, lights.state, shadowsArray, scene, object );
                const programCacheKey = programCache.getProgramCacheKey( parameters );

                let program = materialProperties.program;
                let programChange = true;

                if ( program === undefined ) {

                        // new material
                        material.addEventListener( 'dispose', onMaterialDispose );

                } else if ( program.cacheKey !== programCacheKey ) {

                        // changed glsl or parameters
                        releaseMaterialProgramReference( material );

                } else if ( materialProperties.lightsStateVersion !== lightsStateVersion ) {

                        programChange = false;

                } else if ( parameters.shaderID !== undefined ) {

                        // same glsl and uniform list, envMap still needs the update here to avoid a frame-late effect

                        const environment = material.isMeshStandardMaterial ? scene.environment : null;
                        materialProperties.envMap = cubemaps.get( material.envMap || environment );

                        return;

                } else {

                        // only rebuild uniform list
                        programChange = false;

                }

                if ( programChange ) {

                        parameters.uniforms = programCache.getUniforms( material );

                        material.onBeforeCompile( parameters, _this );

                        program = programCache.acquireProgram( parameters, programCacheKey );

                        materialProperties.program = program;
                        materialProperties.uniforms = parameters.uniforms;
                        materialProperties.outputEncoding = parameters.outputEncoding;

                }

                const uniforms = materialProperties.uniforms;

                if ( ! material.isShaderMaterial &&
                        ! material.isRawShaderMaterial ||
                        material.clipping === true ) {

                        materialProperties.numClippingPlanes = clipping.numPlanes;
                        materialProperties.numIntersection = clipping.numIntersection;
                        uniforms.clippingPlanes = clipping.uniform;

                }

                materialProperties.environment = material.isMeshStandardMaterial ? scene.environment : null;
                materialProperties.fog = scene.fog;
                materialProperties.envMap = cubemaps.get( material.envMap || materialProperties.environment );

                // store the light setup it was created for

                materialProperties.needsLights = materialNeedsLights( material );
                materialProperties.lightsStateVersion = lightsStateVersion;

                if ( materialProperties.needsLights ) {

                        // wire up the material to this renderer's lighting state

                        uniforms.ambientLightColor.value = lights.state.ambient;
                        uniforms.lightProbe.value = lights.state.probe;
                        uniforms.directionalLights.value = lights.state.directional;
                        uniforms.directionalLightShadows.value = lights.state.directionalShadow;
                        uniforms.spotLights.value = lights.state.spot;
                        uniforms.spotLightShadows.value = lights.state.spotShadow;
                        uniforms.rectAreaLights.value = lights.state.rectArea;
                        uniforms.ltc_1.value = lights.state.rectAreaLTC1;
                        uniforms.ltc_2.value = lights.state.rectAreaLTC2;
                        uniforms.pointLights.value = lights.state.point;
                        uniforms.pointLightShadows.value = lights.state.pointShadow;
                        uniforms.hemisphereLights.value = lights.state.hemi;

                        uniforms.directionalShadowMap.value = lights.state.directionalShadowMap;
                        uniforms.directionalShadowMatrix.value = lights.state.directionalShadowMatrix;
                        uniforms.spotShadowMap.value = lights.state.spotShadowMap;
                        uniforms.spotShadowMatrix.value = lights.state.spotShadowMatrix;
                        uniforms.pointShadowMap.value = lights.state.pointShadowMap;
                        uniforms.pointShadowMatrix.value = lights.state.pointShadowMatrix;
                        // TODO (abelnation): add area lights shadow info to uniforms

                }

                const progUniforms = materialProperties.program.getUniforms();
                const uniformsList = WebGLUniforms.seqWithValue( progUniforms.seq, uniforms );

                materialProperties.uniformsList = uniformsList;

        }

        function setProgram( camera, scene, material, object ) {

                if ( scene.isScene !== true ) scene = _emptyScene; // scene could be a Mesh, Line, Points, ...

                textures.resetTextureUnits();

                const fog = scene.fog;
                const environment = material.isMeshStandardMaterial ? scene.environment : null;
                const encoding = ( _currentRenderTarget === null ) ? _this.outputEncoding : _currentRenderTarget.texture.encoding;
                const envMap = cubemaps.get( material.envMap || environment );

                const materialProperties = properties.get( material );
                const lights = currentRenderState.state.lights;

                if ( _clippingEnabled === true ) {

                        if ( _localClippingEnabled === true || camera !== _currentCamera ) {

                                const useCache =
                                        camera === _currentCamera &&
                                        material.id === _currentMaterialId;

                                // we might want to call this function with some ClippingGroup
                                // object instead of the material, once it becomes feasible
                                // (#8465, #8379)
                                clipping.setState( material, camera, useCache );

                        }

                }

                if ( material.version === materialProperties.__version ) {

                        if ( material.fog && materialProperties.fog !== fog ) {

                                initMaterial( material, scene, object );

                        } else if ( materialProperties.environment !== environment ) {

                                initMaterial( material, scene, object );

                        } else if ( materialProperties.needsLights && ( materialProperties.lightsStateVersion !== lights.state.version ) ) {

                                initMaterial( material, scene, object );

                        } else if ( materialProperties.numClippingPlanes !== undefined &&
                                ( materialProperties.numClippingPlanes !== clipping.numPlanes ||
                                materialProperties.numIntersection !== clipping.numIntersection ) ) {

                                initMaterial( material, scene, object );

                        } else if ( materialProperties.outputEncoding !== encoding ) {

                                initMaterial( material, scene, object );

                        } else if ( materialProperties.envMap !== envMap ) {

                                initMaterial( material, scene, object );

                        }

                } else {

                        initMaterial( material, scene, object );
                        materialProperties.__version = material.version;

                }

                let refreshProgram = false;
                let refreshMaterial = false;
                let refreshLights = false;

                const program = materialProperties.program,
                        p_uniforms = program.getUniforms(),
                        m_uniforms = materialProperties.uniforms;

                if ( state.useProgram( program.program ) ) {

                        refreshProgram = true;
                        refreshMaterial = true;
                        refreshLights = true;

                }

                if ( material.id !== _currentMaterialId ) {

                        _currentMaterialId = material.id;

                        refreshMaterial = true;

                }

                if ( refreshProgram || _currentCamera !== camera ) {

                        p_uniforms.setValue( _gl, 'projectionMatrix', camera.projectionMatrix );

                        if ( capabilities.logarithmicDepthBuffer ) {

                                p_uniforms.setValue( _gl, 'logDepthBufFC',
                                        2.0 / ( Math.log( camera.far + 1.0 ) / Math.LN2 ) );

                        }

                        if ( _currentCamera !== camera ) {

                                _currentCamera = camera;

                                // lighting uniforms depend on the camera so enforce an update
                                // now, in case this material supports lights - or later, when
                                // the next material that does gets activated:

                                refreshMaterial = true;         // set to true on material change
                                refreshLights = true;           // remains set until update done

                        }

                        // load material specific uniforms
                        // (shader material also gets them for the sake of genericity)

                        if ( material.isShaderMaterial ||
                                material.isMeshPhongMaterial ||
                                material.isMeshToonMaterial ||
                                material.isMeshStandardMaterial ||
                                material.envMap ) {

                                const uCamPos = p_uniforms.map.cameraPosition;

                                if ( uCamPos !== undefined ) {

                                        uCamPos.setValue( _gl,
                                                _vector3.setFromMatrixPosition( camera.matrixWorld ) );

                                }

                        }

                        if ( material.isMeshPhongMaterial ||
                                material.isMeshToonMaterial ||
                                material.isMeshLambertMaterial ||
                                material.isMeshBasicMaterial ||
                                material.isMeshStandardMaterial ||
                                material.isShaderMaterial ) {

                                p_uniforms.setValue( _gl, 'isOrthographic', camera.isOrthographicCamera === true );

                        }

                        if ( material.isMeshPhongMaterial ||
                                material.isMeshToonMaterial ||
                                material.isMeshLambertMaterial ||
                                material.isMeshBasicMaterial ||
                                material.isMeshStandardMaterial ||
                                material.isShaderMaterial ||
                                material.isShadowMaterial ||
                                material.skinning ) {

                                p_uniforms.setValue( _gl, 'viewMatrix', camera.matrixWorldInverse );

                        }

                }

                // skinning uniforms must be set even if material didn't change
                // auto-setting of texture unit for bone texture must go before other textures
                // otherwise textures used for skinning can take over texture units reserved for other material textures

                if ( material.skinning ) {

                        p_uniforms.setOptional( _gl, object, 'bindMatrix' );
                        p_uniforms.setOptional( _gl, object, 'bindMatrixInverse' );

                        const skeleton = object.skeleton;

                        if ( skeleton ) {

                                const bones = skeleton.bones;

                                if ( capabilities.floatVertexTextures ) {

                                        if ( skeleton.boneTexture === null ) {

                                                // layout (1 matrix = 4 pixels)
                                                //      RGBA RGBA RGBA RGBA (=> column1, column2, column3, column4)
                                                //  with  8x8  pixel texture max   16 bones * 4 pixels =  (8 * 8)
                                                //       16x16 pixel texture max   64 bones * 4 pixels = (16 * 16)
                                                //       32x32 pixel texture max  256 bones * 4 pixels = (32 * 32)
                                                //       64x64 pixel texture max 1024 bones * 4 pixels = (64 * 64)


                                                let size = Math.sqrt( bones.length * 4 ); // 4 pixels needed for 1 matrix
                                                size = MathUtils.ceilPowerOfTwo( size );
                                                size = Math.max( size, 4 );

                                                const boneMatrices = new Float32Array( size * size * 4 ); // 4 floats per RGBA pixel
                                                boneMatrices.set( skeleton.boneMatrices ); // copy current values

                                                const boneTexture = new DataTexture( boneMatrices, size, size, RGBAFormat, FloatType );

                                                skeleton.boneMatrices = boneMatrices;
                                                skeleton.boneTexture = boneTexture;
                                                skeleton.boneTextureSize = size;

                                        }

                                        p_uniforms.setValue( _gl, 'boneTexture', skeleton.boneTexture, textures );
                                        p_uniforms.setValue( _gl, 'boneTextureSize', skeleton.boneTextureSize );

                                } else {

                                        p_uniforms.setOptional( _gl, skeleton, 'boneMatrices' );

                                }

                        }

                }

                if ( refreshMaterial || materialProperties.receiveShadow !== object.receiveShadow ) {

                        materialProperties.receiveShadow = object.receiveShadow;
                        p_uniforms.setValue( _gl, 'receiveShadow', object.receiveShadow );

                }

                if ( refreshMaterial ) {

                        p_uniforms.setValue( _gl, 'toneMappingExposure', _this.toneMappingExposure );

                        if ( materialProperties.needsLights ) {

                                // the current material requires lighting info

                                // note: all lighting uniforms are always set correctly
                                // they simply reference the renderer's state for their
                                // values
                                //
                                // use the current material's .needsUpdate flags to set
                                // the GL state when required

                                markUniformsLightsNeedsUpdate( m_uniforms, refreshLights );

                        }

                        // refresh uniforms common to several materials

                        if ( fog && material.fog ) {

                                materials.refreshFogUniforms( m_uniforms, fog );

                        }

                        materials.refreshMaterialUniforms( m_uniforms, material, _pixelRatio, _height );

                        WebGLUniforms.upload( _gl, materialProperties.uniformsList, m_uniforms, textures );

                }

                if ( material.isShaderMaterial && material.uniformsNeedUpdate === true ) {

                        WebGLUniforms.upload( _gl, materialProperties.uniformsList, m_uniforms, textures );
                        material.uniformsNeedUpdate = false;

                }

                if ( material.isSpriteMaterial ) {

                        p_uniforms.setValue( _gl, 'center', object.center );

                }

                // common matrices

                p_uniforms.setValue( _gl, 'modelViewMatrix', object.modelViewMatrix );
                p_uniforms.setValue( _gl, 'normalMatrix', object.normalMatrix );
                p_uniforms.setValue( _gl, 'modelMatrix', object.matrixWorld );

                return program;

        }

        // If uniforms are marked as clean, they don't need to be loaded to the GPU.

        function markUniformsLightsNeedsUpdate( uniforms, value ) {

                uniforms.ambientLightColor.needsUpdate = value;
                uniforms.lightProbe.needsUpdate = value;

                uniforms.directionalLights.needsUpdate = value;
                uniforms.directionalLightShadows.needsUpdate = value;
                uniforms.pointLights.needsUpdate = value;
                uniforms.pointLightShadows.needsUpdate = value;
                uniforms.spotLights.needsUpdate = value;
                uniforms.spotLightShadows.needsUpdate = value;
                uniforms.rectAreaLights.needsUpdate = value;
                uniforms.hemisphereLights.needsUpdate = value;

        }

        function materialNeedsLights( material ) {

                return material.isMeshLambertMaterial || material.isMeshToonMaterial || material.isMeshPhongMaterial ||
                        material.isMeshStandardMaterial || material.isShadowMaterial ||
                        ( material.isShaderMaterial && material.lights === true );

        }

        //
        this.setFramebuffer = function ( value ) {

                if ( _framebuffer !== value && _currentRenderTarget === null ) _gl.bindFramebuffer( 36160, value );

                _framebuffer = value;

        };

        this.getActiveCubeFace = function () {

                return _currentActiveCubeFace;

        };

        this.getActiveMipmapLevel = function () {

                return _currentActiveMipmapLevel;

        };

        this.getRenderList = function () {

                return currentRenderList;

        };

        this.setRenderList = function ( renderList ) {

                currentRenderList = renderList;

        };

        this.getRenderState = function () {

                return currentRenderState;

        };

        this.setRenderState = function ( renderState ) {

                currentRenderState = renderState;

        };

        this.getRenderTarget = function () {

                return _currentRenderTarget;

        };

        this.setRenderTarget = function ( renderTarget, activeCubeFace = 0, activeMipmapLevel = 0 ) {

                _currentRenderTarget = renderTarget;
                _currentActiveCubeFace = activeCubeFace;
                _currentActiveMipmapLevel = activeMipmapLevel;

                if ( renderTarget && properties.get( renderTarget ).__webglFramebuffer === undefined ) {

                        textures.setupRenderTarget( renderTarget );

                }

                let framebuffer = _framebuffer;
                let isCube = false;

                if ( renderTarget ) {

                        const __webglFramebuffer = properties.get( renderTarget ).__webglFramebuffer;

                        if ( renderTarget.isWebGLCubeRenderTarget ) {

                                framebuffer = __webglFramebuffer[ activeCubeFace ];
                                isCube = true;

                        } else if ( renderTarget.isWebGLMultisampleRenderTarget ) {

                                framebuffer = properties.get( renderTarget ).__webglMultisampledFramebuffer;

                        } else {

                                framebuffer = __webglFramebuffer;

                        }

                        _currentViewport.copy( renderTarget.viewport );
                        _currentScissor.copy( renderTarget.scissor );
                        _currentScissorTest = renderTarget.scissorTest;

                } else {

                        _currentViewport.copy( _viewport ).multiplyScalar( _pixelRatio ).floor();
                        _currentScissor.copy( _scissor ).multiplyScalar( _pixelRatio ).floor();
                        _currentScissorTest = _scissorTest;

                }

                if ( _currentFramebuffer !== framebuffer ) {

                        _gl.bindFramebuffer( 36160, framebuffer );
                        _currentFramebuffer = framebuffer;

                }

                state.viewport( _currentViewport );
                state.scissor( _currentScissor );
                state.setScissorTest( _currentScissorTest );

                if ( isCube ) {

                        const textureProperties = properties.get( renderTarget.texture );
                        _gl.framebufferTexture2D( 36160, 36064, 34069 + activeCubeFace, textureProperties.__webglTexture, activeMipmapLevel );

                }

        };

        this.readRenderTargetPixels = function ( renderTarget, x, y, width, height, buffer, activeCubeFaceIndex ) {

                if ( ! ( renderTarget && renderTarget.isWebGLRenderTarget ) ) {

                        console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not THREE.WebGLRenderTarget.' );
                        return;

                }

                let framebuffer = properties.get( renderTarget ).__webglFramebuffer;

                if ( renderTarget.isWebGLCubeRenderTarget && activeCubeFaceIndex !== undefined ) {

                        framebuffer = framebuffer[ activeCubeFaceIndex ];

                }

                if ( framebuffer ) {

                        let restore = false;

                        if ( framebuffer !== _currentFramebuffer ) {

                                _gl.bindFramebuffer( 36160, framebuffer );

                                restore = true;

                        }

                        try {

                                const texture = renderTarget.texture;
                                const textureFormat = texture.format;
                                const textureType = texture.type;

                                if ( textureFormat !== RGBAFormat && utils.convert( textureFormat ) !== _gl.getParameter( 35739 ) ) {

                                        console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in RGBA or implementation defined format.' );
                                        return;

                                }

                                if ( textureType !== UnsignedByteType && utils.convert( textureType ) !== _gl.getParameter( 35738 ) && // IE11, Edge and Chrome Mac < 52 (#9513)
                                        ! ( textureType === FloatType && ( capabilities.isWebGL2 || extensions.get( 'OES_texture_float' ) || extensions.get( 'WEBGL_color_buffer_float' ) ) ) && // Chrome Mac >= 52 and Firefox
                                        ! ( textureType === HalfFloatType && ( capabilities.isWebGL2 ? extensions.get( 'EXT_color_buffer_float' ) : extensions.get( 'EXT_color_buffer_half_float' ) ) ) ) {

                                        console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in UnsignedByteType or implementation defined type.' );
                                        return;

                                }

                                if ( _gl.checkFramebufferStatus( 36160 ) === 36053 ) {

                                        // the following if statement ensures valid read requests (no out-of-bounds pixels, see #8604)

                                        if ( ( x >= 0 && x <= ( renderTarget.width - width ) ) && ( y >= 0 && y <= ( renderTarget.height - height ) ) ) {

                                                _gl.readPixels( x, y, width, height, utils.convert( textureFormat ), utils.convert( textureType ), buffer );

                                        }

                                } else {

                                        console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: readPixels from renderTarget failed. Framebuffer not complete.' );

                                }

                        } finally {

                                if ( restore ) {

                                        _gl.bindFramebuffer( 36160, _currentFramebuffer );

                                }

                        }

                }

        };

        this.copyFramebufferToTexture = function ( position, texture, level = 0 ) {

                const levelScale = Math.pow( 2, - level );
                const width = Math.floor( texture.image.width * levelScale );
                const height = Math.floor( texture.image.height * levelScale );
                const glFormat = utils.convert( texture.format );

                textures.setTexture2D( texture, 0 );

                _gl.copyTexImage2D( 3553, level, glFormat, position.x, position.y, width, height, 0 );

                state.unbindTexture();

        };

        this.copyTextureToTexture = function ( position, srcTexture, dstTexture, level = 0 ) {

                const width = srcTexture.image.width;
                const height = srcTexture.image.height;
                const glFormat = utils.convert( dstTexture.format );
                const glType = utils.convert( dstTexture.type );

                textures.setTexture2D( dstTexture, 0 );

                // As another texture upload may have changed pixelStorei
                // parameters, make sure they are correct for the dstTexture
                _gl.pixelStorei( 37440, dstTexture.flipY );
                _gl.pixelStorei( 37441, dstTexture.premultiplyAlpha );
                _gl.pixelStorei( 3317, dstTexture.unpackAlignment );

                if ( srcTexture.isDataTexture ) {

                        _gl.texSubImage2D( 3553, level, position.x, position.y, width, height, glFormat, glType, srcTexture.image.data );

                } else {

                        if ( srcTexture.isCompressedTexture ) {

                                _gl.compressedTexSubImage2D( 3553, level, position.x, position.y, srcTexture.mipmaps[ 0 ].width, srcTexture.mipmaps[ 0 ].height, glFormat, srcTexture.mipmaps[ 0 ].data );

                        } else {

                                _gl.texSubImage2D( 3553, level, position.x, position.y, glFormat, glType, srcTexture.image );

                        }

                }

                // Generate mipmaps only when copying level 0
                if ( level === 0 && dstTexture.generateMipmaps ) _gl.generateMipmap( 3553 );

                state.unbindTexture();

        };

        this.initTexture = function ( texture ) {

                textures.setTexture2D( texture, 0 );

                state.unbindTexture();

        };

        if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {

                __THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'observe', { detail: this } ) ); // eslint-disable-line no-undef

        }

}

function WebGL1Renderer( parameters ) {

        WebGLRenderer.call( this, parameters );

}

WebGL1Renderer.prototype = Object.assign( Object.create( WebGLRenderer.prototype ), {

        constructor: WebGL1Renderer,

        isWebGL1Renderer: true

} );

class FogExp2 {

        constructor( color, density ) {

                Object.defineProperty( this, 'isFogExp2', { value: true } );

                this.name = '';

                this.color = new Color( color );
                this.density = ( density !== undefined ) ? density : 0.00025;

        }

        clone() {

                return new FogExp2( this.color, this.density );

        }

        toJSON( /* meta */ ) {

                return {
                        type: 'FogExp2',
                        color: this.color.getHex(),
                        density: this.density
                };

        }

}

class Fog {

        constructor( color, near, far ) {

                Object.defineProperty( this, 'isFog', { value: true } );

                this.name = '';

                this.color = new Color( color );

                this.near = ( near !== undefined ) ? near : 1;
                this.far = ( far !== undefined ) ? far : 1000;

        }

        clone() {

                return new Fog( this.color, this.near, this.far );

        }

        toJSON( /* meta */ ) {

                return {
                        type: 'Fog',
                        color: this.color.getHex(),
                        near: this.near,
                        far: this.far
                };

        }

}

class Scene extends Object3D {

        constructor() {

                super();

                Object.defineProperty( this, 'isScene', { value: true } );

                this.type = 'Scene';

                this.background = null;
                this.environment = null;
                this.fog = null;

                this.overrideMaterial = null;

                this.autoUpdate = true; // checked by the renderer

                if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {

                        __THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'observe', { detail: this } ) ); // eslint-disable-line no-undef

                }

        }

        copy( source, recursive ) {

                super.copy( source, recursive );

                if ( source.background !== null ) this.background = source.background.clone();
                if ( source.environment !== null ) this.environment = source.environment.clone();
                if ( source.fog !== null ) this.fog = source.fog.clone();

                if ( source.overrideMaterial !== null ) this.overrideMaterial = source.overrideMaterial.clone();

                this.autoUpdate = source.autoUpdate;
                this.matrixAutoUpdate = source.matrixAutoUpdate;

                return this;

        }

        toJSON( meta ) {

                const data = super.toJSON( meta );

                if ( this.background !== null ) data.object.background = this.background.toJSON( meta );
                if ( this.environment !== null ) data.object.environment = this.environment.toJSON( meta );
                if ( this.fog !== null ) data.object.fog = this.fog.toJSON();

                return data;

        }

}

function InterleavedBuffer( array, stride ) {

        this.array = array;
        this.stride = stride;
        this.count = array !== undefined ? array.length / stride : 0;

        this.usage = StaticDrawUsage;
        this.updateRange = { offset: 0, count: - 1 };

        this.version = 0;

        this.uuid = MathUtils.generateUUID();

}

Object.defineProperty( InterleavedBuffer.prototype, 'needsUpdate', {

        set: function ( value ) {

                if ( value === true ) this.version ++;

        }

} );

Object.assign( InterleavedBuffer.prototype, {

        isInterleavedBuffer: true,

        onUploadCallback: function () {},

        setUsage: function ( value ) {

                this.usage = value;

                return this;

        },

        copy: function ( source ) {

                this.array = new source.array.constructor( source.array );
                this.count = source.count;
                this.stride = source.stride;
                this.usage = source.usage;

                return this;

        },

        copyAt: function ( index1, attribute, index2 ) {

                index1 *= this.stride;
                index2 *= attribute.stride;

                for ( let i = 0, l = this.stride; i < l; i ++ ) {

                        this.array[ index1 + i ] = attribute.array[ index2 + i ];

                }

                return this;

        },

        set: function ( value, offset = 0 ) {

                this.array.set( value, offset );

                return this;

        },

        clone: function ( data ) {

                if ( data.arrayBuffers === undefined ) {

                        data.arrayBuffers = {};

                }

                if ( this.array.buffer._uuid === undefined ) {

                        this.array.buffer._uuid = MathUtils.generateUUID();

                }

                if ( data.arrayBuffers[ this.array.buffer._uuid ] === undefined ) {

                        data.arrayBuffers[ this.array.buffer._uuid ] = this.array.slice( 0 ).buffer;

                }

                const array = new this.array.constructor( data.arrayBuffers[ this.array.buffer._uuid ] );

                const ib = new InterleavedBuffer( array, this.stride );
                ib.setUsage( this.usage );

                return ib;

        },

        onUpload: function ( callback ) {

                this.onUploadCallback = callback;

                return this;

        },

        toJSON: function ( data ) {

                if ( data.arrayBuffers === undefined ) {

                        data.arrayBuffers = {};

                }

                // generate UUID for array buffer if necessary

                if ( this.array.buffer._uuid === undefined ) {

                        this.array.buffer._uuid = MathUtils.generateUUID();

                }

                if ( data.arrayBuffers[ this.array.buffer._uuid ] === undefined ) {

                        data.arrayBuffers[ this.array.buffer._uuid ] = Array.prototype.slice.call( new Uint32Array( this.array.buffer ) );

                }

                //

                return {
                        uuid: this.uuid,
                        buffer: this.array.buffer._uuid,
                        type: this.array.constructor.name,
                        stride: this.stride
                };

        }

} );

const _vector$6 = new Vector3();

function InterleavedBufferAttribute( interleavedBuffer, itemSize, offset, normalized ) {

        this.name = '';

        this.data = interleavedBuffer;
        this.itemSize = itemSize;
        this.offset = offset;

        this.normalized = normalized === true;

}

Object.defineProperties( InterleavedBufferAttribute.prototype, {

        count: {

                get: function () {

                        return this.data.count;

                }

        },

        array: {

                get: function () {

                        return this.data.array;

                }

        },

        needsUpdate: {

                set: function ( value ) {

                        this.data.needsUpdate = value;

                }

        }

} );

Object.assign( InterleavedBufferAttribute.prototype, {

        isInterleavedBufferAttribute: true,

        applyMatrix4: function ( m ) {

                for ( let i = 0, l = this.data.count; i < l; i ++ ) {

                        _vector$6.x = this.getX( i );
                        _vector$6.y = this.getY( i );
                        _vector$6.z = this.getZ( i );

                        _vector$6.applyMatrix4( m );

                        this.setXYZ( i, _vector$6.x, _vector$6.y, _vector$6.z );

                }

                return this;

        },

        setX: function ( index, x ) {

                this.data.array[ index * this.data.stride + this.offset ] = x;

                return this;

        },

        setY: function ( index, y ) {

                this.data.array[ index * this.data.stride + this.offset + 1 ] = y;

                return this;

        },

        setZ: function ( index, z ) {

                this.data.array[ index * this.data.stride + this.offset + 2 ] = z;

                return this;

        },

        setW: function ( index, w ) {

                this.data.array[ index * this.data.stride + this.offset + 3 ] = w;

                return this;

        },

        getX: function ( index ) {

                return this.data.array[ index * this.data.stride + this.offset ];

        },

        getY: function ( index ) {

                return this.data.array[ index * this.data.stride + this.offset + 1 ];

        },

        getZ: function ( index ) {

                return this.data.array[ index * this.data.stride + this.offset + 2 ];

        },

        getW: function ( index ) {

                return this.data.array[ index * this.data.stride + this.offset + 3 ];

        },

        setXY: function ( index, x, y ) {

                index = index * this.data.stride + this.offset;

                this.data.array[ index + 0 ] = x;
                this.data.array[ index + 1 ] = y;

                return this;

        },

        setXYZ: function ( index, x, y, z ) {

                index = index * this.data.stride + this.offset;

                this.data.array[ index + 0 ] = x;
                this.data.array[ index + 1 ] = y;
                this.data.array[ index + 2 ] = z;

                return this;

        },

        setXYZW: function ( index, x, y, z, w ) {

                index = index * this.data.stride + this.offset;

                this.data.array[ index + 0 ] = x;
                this.data.array[ index + 1 ] = y;
                this.data.array[ index + 2 ] = z;
                this.data.array[ index + 3 ] = w;

                return this;

        },

        clone: function ( data ) {

                if ( data === undefined ) {

                        console.log( 'THREE.InterleavedBufferAttribute.clone(): Cloning an interlaved buffer attribute will deinterleave buffer data.' );

                        const array = [];

                        for ( let i = 0; i < this.count; i ++ ) {

                                const index = i * this.data.stride + this.offset;

                                for ( let j = 0; j < this.itemSize; j ++ ) {

                                        array.push( this.data.array[ index + j ] );

                                }

                        }

                        return new BufferAttribute( new this.array.constructor( array ), this.itemSize, this.normalized );

                } else {

                        if ( data.interleavedBuffers === undefined ) {

                                data.interleavedBuffers = {};

                        }

                        if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {

                                data.interleavedBuffers[ this.data.uuid ] = this.data.clone( data );

                        }

                        return new InterleavedBufferAttribute( data.interleavedBuffers[ this.data.uuid ], this.itemSize, this.offset, this.normalized );

                }

        },

        toJSON: function ( data ) {

                if ( data === undefined ) {

                        console.log( 'THREE.InterleavedBufferAttribute.toJSON(): Serializing an interlaved buffer attribute will deinterleave buffer data.' );

                        const array = [];

                        for ( let i = 0; i < this.count; i ++ ) {

                                const index = i * this.data.stride + this.offset;

                                for ( let j = 0; j < this.itemSize; j ++ ) {

                                        array.push( this.data.array[ index + j ] );

                                }

                        }

                        // deinterleave data and save it as an ordinary buffer attribute for now

                        return {
                                itemSize: this.itemSize,
                                type: this.array.constructor.name,
                                array: array,
                                normalized: this.normalized
                        };

                } else {

                        // save as true interlaved attribtue

                        if ( data.interleavedBuffers === undefined ) {

                                data.interleavedBuffers = {};

                        }

                        if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {

                                data.interleavedBuffers[ this.data.uuid ] = this.data.toJSON( data );

                        }

                        return {
                                isInterleavedBufferAttribute: true,
                                itemSize: this.itemSize,
                                data: this.data.uuid,
                                offset: this.offset,
                                normalized: this.normalized
                        };

                }

        }

} );

/**
 * parameters = {
 *  color: <hex>,
 *  map: new THREE.Texture( <Image> ),
 *  alphaMap: new THREE.Texture( <Image> ),
 *  rotation: <float>,
 *  sizeAttenuation: <bool>
 * }
 */

function SpriteMaterial( parameters ) {

        Material.call( this );

        this.type = 'SpriteMaterial';

        this.color = new Color( 0xffffff );

        this.map = null;

        this.alphaMap = null;

        this.rotation = 0;

        this.sizeAttenuation = true;

        this.transparent = true;

        this.setValues( parameters );

}

SpriteMaterial.prototype = Object.create( Material.prototype );
SpriteMaterial.prototype.constructor = SpriteMaterial;
SpriteMaterial.prototype.isSpriteMaterial = true;

SpriteMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.color.copy( source.color );

        this.map = source.map;

        this.alphaMap = source.alphaMap;

        this.rotation = source.rotation;

        this.sizeAttenuation = source.sizeAttenuation;

        return this;

};

let _geometry;

const _intersectPoint = new Vector3();
const _worldScale = new Vector3();
const _mvPosition = new Vector3();

const _alignedPosition = new Vector2();
const _rotatedPosition = new Vector2();
const _viewWorldMatrix = new Matrix4();

const _vA$1 = new Vector3();
const _vB$1 = new Vector3();
const _vC$1 = new Vector3();

const _uvA$1 = new Vector2();
const _uvB$1 = new Vector2();
const _uvC$1 = new Vector2();

function Sprite( material ) {

        Object3D.call( this );

        this.type = 'Sprite';

        if ( _geometry === undefined ) {

                _geometry = new BufferGeometry();

                const float32Array = new Float32Array( [
                        - 0.5, - 0.5, 0, 0, 0,
                        0.5, - 0.5, 0, 1, 0,
                        0.5, 0.5, 0, 1, 1,
                        - 0.5, 0.5, 0, 0, 1
                ] );

                const interleavedBuffer = new InterleavedBuffer( float32Array, 5 );

                _geometry.setIndex( [ 0, 1, 2,  0, 2, 3 ] );
                _geometry.setAttribute( 'position', new InterleavedBufferAttribute( interleavedBuffer, 3, 0, false ) );
                _geometry.setAttribute( 'uv', new InterleavedBufferAttribute( interleavedBuffer, 2, 3, false ) );

        }

        this.geometry = _geometry;
        this.material = ( material !== undefined ) ? material : new SpriteMaterial();

        this.center = new Vector2( 0.5, 0.5 );

}

Sprite.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: Sprite,

        isSprite: true,

        raycast: function ( raycaster, intersects ) {

                if ( raycaster.camera === null ) {

                        console.error( 'THREE.Sprite: "Raycaster.camera" needs to be set in order to raycast against sprites.' );

                }

                _worldScale.setFromMatrixScale( this.matrixWorld );

                _viewWorldMatrix.copy( raycaster.camera.matrixWorld );
                this.modelViewMatrix.multiplyMatrices( raycaster.camera.matrixWorldInverse, this.matrixWorld );

                _mvPosition.setFromMatrixPosition( this.modelViewMatrix );

                if ( raycaster.camera.isPerspectiveCamera && this.material.sizeAttenuation === false ) {

                        _worldScale.multiplyScalar( - _mvPosition.z );

                }

                const rotation = this.material.rotation;
                let sin, cos;

                if ( rotation !== 0 ) {

                        cos = Math.cos( rotation );
                        sin = Math.sin( rotation );

                }

                const center = this.center;

                transformVertex( _vA$1.set( - 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
                transformVertex( _vB$1.set( 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
                transformVertex( _vC$1.set( 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );

                _uvA$1.set( 0, 0 );
                _uvB$1.set( 1, 0 );
                _uvC$1.set( 1, 1 );

                // check first triangle
                let intersect = raycaster.ray.intersectTriangle( _vA$1, _vB$1, _vC$1, false, _intersectPoint );

                if ( intersect === null ) {

                        // check second triangle
                        transformVertex( _vB$1.set( - 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
                        _uvB$1.set( 0, 1 );

                        intersect = raycaster.ray.intersectTriangle( _vA$1, _vC$1, _vB$1, false, _intersectPoint );
                        if ( intersect === null ) {

                                return;

                        }

                }

                const distance = raycaster.ray.origin.distanceTo( _intersectPoint );

                if ( distance < raycaster.near || distance > raycaster.far ) return;

                intersects.push( {

                        distance: distance,
                        point: _intersectPoint.clone(),
                        uv: Triangle.getUV( _intersectPoint, _vA$1, _vB$1, _vC$1, _uvA$1, _uvB$1, _uvC$1, new Vector2() ),
                        face: null,
                        object: this

                } );

        },

        copy: function ( source ) {

                Object3D.prototype.copy.call( this, source );

                if ( source.center !== undefined ) this.center.copy( source.center );

                this.material = source.material;

                return this;

        }

} );

function transformVertex( vertexPosition, mvPosition, center, scale, sin, cos ) {

        // compute position in camera space
        _alignedPosition.subVectors( vertexPosition, center ).addScalar( 0.5 ).multiply( scale );

        // to check if rotation is not zero
        if ( sin !== undefined ) {

                _rotatedPosition.x = ( cos * _alignedPosition.x ) - ( sin * _alignedPosition.y );
                _rotatedPosition.y = ( sin * _alignedPosition.x ) + ( cos * _alignedPosition.y );

        } else {

                _rotatedPosition.copy( _alignedPosition );

        }


        vertexPosition.copy( mvPosition );
        vertexPosition.x += _rotatedPosition.x;
        vertexPosition.y += _rotatedPosition.y;

        // transform to world space
        vertexPosition.applyMatrix4( _viewWorldMatrix );

}

const _v1$4 = new Vector3();
const _v2$2 = new Vector3();

function LOD() {

        Object3D.call( this );

        this._currentLevel = 0;

        this.type = 'LOD';

        Object.defineProperties( this, {
                levels: {
                        enumerable: true,
                        value: []
                }
        } );

        this.autoUpdate = true;

}

LOD.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: LOD,

        isLOD: true,

        copy: function ( source ) {

                Object3D.prototype.copy.call( this, source, false );

                const levels = source.levels;

                for ( let i = 0, l = levels.length; i < l; i ++ ) {

                        const level = levels[ i ];

                        this.addLevel( level.object.clone(), level.distance );

                }

                this.autoUpdate = source.autoUpdate;

                return this;

        },

        addLevel: function ( object, distance = 0 ) {

                distance = Math.abs( distance );

                const levels = this.levels;

                let l;

                for ( l = 0; l < levels.length; l ++ ) {

                        if ( distance < levels[ l ].distance ) {

                                break;

                        }

                }

                levels.splice( l, 0, { distance: distance, object: object } );

                this.add( object );

                return this;

        },

        getCurrentLevel: function () {

                return this._currentLevel;

        },

        getObjectForDistance: function ( distance ) {

                const levels = this.levels;

                if ( levels.length > 0 ) {

                        let i, l;

                        for ( i = 1, l = levels.length; i < l; i ++ ) {

                                if ( distance < levels[ i ].distance ) {

                                        break;

                                }

                        }

                        return levels[ i - 1 ].object;

                }

                return null;

        },

        raycast: function ( raycaster, intersects ) {

                const levels = this.levels;

                if ( levels.length > 0 ) {

                        _v1$4.setFromMatrixPosition( this.matrixWorld );

                        const distance = raycaster.ray.origin.distanceTo( _v1$4 );

                        this.getObjectForDistance( distance ).raycast( raycaster, intersects );

                }

        },

        update: function ( camera ) {

                const levels = this.levels;

                if ( levels.length > 1 ) {

                        _v1$4.setFromMatrixPosition( camera.matrixWorld );
                        _v2$2.setFromMatrixPosition( this.matrixWorld );

                        const distance = _v1$4.distanceTo( _v2$2 ) / camera.zoom;

                        levels[ 0 ].object.visible = true;

                        let i, l;

                        for ( i = 1, l = levels.length; i < l; i ++ ) {

                                if ( distance >= levels[ i ].distance ) {

                                        levels[ i - 1 ].object.visible = false;
                                        levels[ i ].object.visible = true;

                                } else {

                                        break;

                                }

                        }

                        this._currentLevel = i - 1;

                        for ( ; i < l; i ++ ) {

                                levels[ i ].object.visible = false;

                        }

                }

        },

        toJSON: function ( meta ) {

                const data = Object3D.prototype.toJSON.call( this, meta );

                if ( this.autoUpdate === false ) data.object.autoUpdate = false;

                data.object.levels = [];

                const levels = this.levels;

                for ( let i = 0, l = levels.length; i < l; i ++ ) {

                        const level = levels[ i ];

                        data.object.levels.push( {
                                object: level.object.uuid,
                                distance: level.distance
                        } );

                }

                return data;

        }

} );

function SkinnedMesh( geometry, material ) {

        if ( geometry && geometry.isGeometry ) {

                console.error( 'THREE.SkinnedMesh no longer supports THREE.Geometry. Use THREE.BufferGeometry instead.' );

        }

        Mesh.call( this, geometry, material );

        this.type = 'SkinnedMesh';

        this.bindMode = 'attached';
        this.bindMatrix = new Matrix4();
        this.bindMatrixInverse = new Matrix4();

}

SkinnedMesh.prototype = Object.assign( Object.create( Mesh.prototype ), {

        constructor: SkinnedMesh,

        isSkinnedMesh: true,

        copy: function ( source ) {

                Mesh.prototype.copy.call( this, source );

                this.bindMode = source.bindMode;
                this.bindMatrix.copy( source.bindMatrix );
                this.bindMatrixInverse.copy( source.bindMatrixInverse );

                this.skeleton = source.skeleton;

                return this;

        },

        bind: function ( skeleton, bindMatrix ) {

                this.skeleton = skeleton;

                if ( bindMatrix === undefined ) {

                        this.updateMatrixWorld( true );

                        this.skeleton.calculateInverses();

                        bindMatrix = this.matrixWorld;

                }

                this.bindMatrix.copy( bindMatrix );
                this.bindMatrixInverse.copy( bindMatrix ).invert();

        },

        pose: function () {

                this.skeleton.pose();

        },

        normalizeSkinWeights: function () {

                const vector = new Vector4();

                const skinWeight = this.geometry.attributes.skinWeight;

                for ( let i = 0, l = skinWeight.count; i < l; i ++ ) {

                        vector.x = skinWeight.getX( i );
                        vector.y = skinWeight.getY( i );
                        vector.z = skinWeight.getZ( i );
                        vector.w = skinWeight.getW( i );

                        const scale = 1.0 / vector.manhattanLength();

                        if ( scale !== Infinity ) {

                                vector.multiplyScalar( scale );

                        } else {

                                vector.set( 1, 0, 0, 0 ); // do something reasonable

                        }

                        skinWeight.setXYZW( i, vector.x, vector.y, vector.z, vector.w );

                }

        },

        updateMatrixWorld: function ( force ) {

                Mesh.prototype.updateMatrixWorld.call( this, force );

                if ( this.bindMode === 'attached' ) {

                        this.bindMatrixInverse.copy( this.matrixWorld ).invert();

                } else if ( this.bindMode === 'detached' ) {

                        this.bindMatrixInverse.copy( this.bindMatrix ).invert();

                } else {

                        console.warn( 'THREE.SkinnedMesh: Unrecognized bindMode: ' + this.bindMode );

                }

        },

        boneTransform: ( function () {

                const basePosition = new Vector3();

                const skinIndex = new Vector4();
                const skinWeight = new Vector4();

                const vector = new Vector3();
                const matrix = new Matrix4();

                return function ( index, target ) {

                        const skeleton = this.skeleton;
                        const geometry = this.geometry;

                        skinIndex.fromBufferAttribute( geometry.attributes.skinIndex, index );
                        skinWeight.fromBufferAttribute( geometry.attributes.skinWeight, index );

                        basePosition.fromBufferAttribute( geometry.attributes.position, index ).applyMatrix4( this.bindMatrix );

                        target.set( 0, 0, 0 );

                        for ( let i = 0; i < 4; i ++ ) {

                                const weight = skinWeight.getComponent( i );

                                if ( weight !== 0 ) {

                                        const boneIndex = skinIndex.getComponent( i );

                                        matrix.multiplyMatrices( skeleton.bones[ boneIndex ].matrixWorld, skeleton.boneInverses[ boneIndex ] );

                                        target.addScaledVector( vector.copy( basePosition ).applyMatrix4( matrix ), weight );

                                }

                        }

                        return target.applyMatrix4( this.bindMatrixInverse );

                };

        }() )

} );

function Bone() {

        Object3D.call( this );

        this.type = 'Bone';

}

Bone.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: Bone,

        isBone: true

} );

const _offsetMatrix = new Matrix4();
const _identityMatrix = new Matrix4();

function Skeleton( bones = [], boneInverses = [] ) {

        this.uuid = MathUtils.generateUUID();

        this.bones = bones.slice( 0 );
        this.boneInverses = boneInverses;
        this.boneMatrices = null;

        this.boneTexture = null;
        this.boneTextureSize = 0;

        this.frame = - 1;

        this.init();

}

Object.assign( Skeleton.prototype, {

        init: function () {

                const bones = this.bones;
                const boneInverses = this.boneInverses;

                this.boneMatrices = new Float32Array( bones.length * 16 );

                // calculate inverse bone matrices if necessary

                if ( boneInverses.length === 0 ) {

                        this.calculateInverses();

                } else {

                        // handle special case

                        if ( bones.length !== boneInverses.length ) {

                                console.warn( 'THREE.Skeleton: Number of inverse bone matrices does not match amount of bones.' );

                                this.boneInverses = [];

                                for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

                                        this.boneInverses.push( new Matrix4() );

                                }

                        }

                }

        },

        calculateInverses: function () {

                this.boneInverses.length = 0;

                for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

                        const inverse = new Matrix4();

                        if ( this.bones[ i ] ) {

                                inverse.copy( this.bones[ i ].matrixWorld ).invert();

                        }

                        this.boneInverses.push( inverse );

                }

        },

        pose: function () {

                // recover the bind-time world matrices

                for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

                        const bone = this.bones[ i ];

                        if ( bone ) {

                                bone.matrixWorld.copy( this.boneInverses[ i ] ).invert();

                        }

                }

                // compute the local matrices, positions, rotations and scales

                for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

                        const bone = this.bones[ i ];

                        if ( bone ) {

                                if ( bone.parent && bone.parent.isBone ) {

                                        bone.matrix.copy( bone.parent.matrixWorld ).invert();
                                        bone.matrix.multiply( bone.matrixWorld );

                                } else {

                                        bone.matrix.copy( bone.matrixWorld );

                                }

                                bone.matrix.decompose( bone.position, bone.quaternion, bone.scale );

                        }

                }

        },

        update: function () {

                const bones = this.bones;
                const boneInverses = this.boneInverses;
                const boneMatrices = this.boneMatrices;
                const boneTexture = this.boneTexture;

                // flatten bone matrices to array

                for ( let i = 0, il = bones.length; i < il; i ++ ) {

                        // compute the offset between the current and the original transform

                        const matrix = bones[ i ] ? bones[ i ].matrixWorld : _identityMatrix;

                        _offsetMatrix.multiplyMatrices( matrix, boneInverses[ i ] );
                        _offsetMatrix.toArray( boneMatrices, i * 16 );

                }

                if ( boneTexture !== null ) {

                        boneTexture.needsUpdate = true;

                }

        },

        clone: function () {

                return new Skeleton( this.bones, this.boneInverses );

        },

        getBoneByName: function ( name ) {

                for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

                        const bone = this.bones[ i ];

                        if ( bone.name === name ) {

                                return bone;

                        }

                }

                return undefined;

        },

        dispose: function ( ) {

                if ( this.boneTexture !== null ) {

                        this.boneTexture.dispose();

                        this.boneTexture = null;

                }

        },

        fromJSON: function ( json, bones ) {

                this.uuid = json.uuid;

                for ( let i = 0, l = json.bones.length; i < l; i ++ ) {

                        const uuid = json.bones[ i ];
                        let bone = bones[ uuid ];

                        if ( bone === undefined ) {

                                console.warn( 'THREE.Skeleton: No bone found with UUID:', uuid );
                                bone = new Bone();

                        }

                        this.bones.push( bone );
                        this.boneInverses.push( new Matrix4().fromArray( json.boneInverses[ i ] ) );

                }

                this.init();

                return this;

        },

        toJSON: function () {

                const data = {
                        metadata: {
                                version: 4.5,
                                type: 'Skeleton',
                                generator: 'Skeleton.toJSON'
                        },
                        bones: [],
                        boneInverses: []
                };

                data.uuid = this.uuid;

                const bones = this.bones;
                const boneInverses = this.boneInverses;

                for ( let i = 0, l = bones.length; i < l; i ++ ) {

                        const bone = bones[ i ];
                        data.bones.push( bone.uuid );

                        const boneInverse = boneInverses[ i ];
                        data.boneInverses.push( boneInverse.toArray() );

                }

                return data;

        }

} );

const _instanceLocalMatrix = new Matrix4();
const _instanceWorldMatrix = new Matrix4();

const _instanceIntersects = [];

const _mesh = new Mesh();

function InstancedMesh( geometry, material, count ) {

        Mesh.call( this, geometry, material );

        this.instanceMatrix = new BufferAttribute( new Float32Array( count * 16 ), 16 );
        this.instanceColor = null;

        this.count = count;

        this.frustumCulled = false;

}

InstancedMesh.prototype = Object.assign( Object.create( Mesh.prototype ), {

        constructor: InstancedMesh,

        isInstancedMesh: true,

        copy: function ( source ) {

                Mesh.prototype.copy.call( this, source );

                this.instanceMatrix.copy( source.instanceMatrix );
                this.count = source.count;

                return this;

        },

        getColorAt: function ( index, color ) {

                color.fromArray( this.instanceColor.array, index * 3 );

        },

        getMatrixAt: function ( index, matrix ) {

                matrix.fromArray( this.instanceMatrix.array, index * 16 );

        },

        raycast: function ( raycaster, intersects ) {

                const matrixWorld = this.matrixWorld;
                const raycastTimes = this.count;

                _mesh.geometry = this.geometry;
                _mesh.material = this.material;

                if ( _mesh.material === undefined ) return;

                for ( let instanceId = 0; instanceId < raycastTimes; instanceId ++ ) {

                        // calculate the world matrix for each instance

                        this.getMatrixAt( instanceId, _instanceLocalMatrix );

                        _instanceWorldMatrix.multiplyMatrices( matrixWorld, _instanceLocalMatrix );

                        // the mesh represents this single instance

                        _mesh.matrixWorld = _instanceWorldMatrix;

                        _mesh.raycast( raycaster, _instanceIntersects );

                        // process the result of raycast

                        for ( let i = 0, l = _instanceIntersects.length; i < l; i ++ ) {

                                const intersect = _instanceIntersects[ i ];
                                intersect.instanceId = instanceId;
                                intersect.object = this;
                                intersects.push( intersect );

                        }

                        _instanceIntersects.length = 0;

                }

        },

        setColorAt: function ( index, color ) {

                if ( this.instanceColor === null ) {

                        this.instanceColor = new BufferAttribute( new Float32Array( this.count * 3 ), 3 );

                }

                color.toArray( this.instanceColor.array, index * 3 );

        },

        setMatrixAt: function ( index, matrix ) {

                matrix.toArray( this.instanceMatrix.array, index * 16 );

        },

        updateMorphTargets: function () {

        }

} );

/**
 * parameters = {
 *  color: <hex>,
 *  opacity: <float>,
 *
 *  linewidth: <float>,
 *  linecap: "round",
 *  linejoin: "round"
 * }
 */

function LineBasicMaterial( parameters ) {

        Material.call( this );

        this.type = 'LineBasicMaterial';

        this.color = new Color( 0xffffff );

        this.linewidth = 1;
        this.linecap = 'round';
        this.linejoin = 'round';

        this.morphTargets = false;

        this.setValues( parameters );

}

LineBasicMaterial.prototype = Object.create( Material.prototype );
LineBasicMaterial.prototype.constructor = LineBasicMaterial;

LineBasicMaterial.prototype.isLineBasicMaterial = true;

LineBasicMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.color.copy( source.color );

        this.linewidth = source.linewidth;
        this.linecap = source.linecap;
        this.linejoin = source.linejoin;

        this.morphTargets = source.morphTargets;

        return this;

};

const _start = new Vector3();
const _end = new Vector3();
const _inverseMatrix$1 = new Matrix4();
const _ray$1 = new Ray();
const _sphere$2 = new Sphere();

function Line( geometry, material, mode ) {

        if ( mode === 1 ) {

                console.error( 'THREE.Line: parameter THREE.LinePieces no longer supported. Use THREE.LineSegments instead.' );

        }

        Object3D.call( this );

        this.type = 'Line';

        this.geometry = geometry !== undefined ? geometry : new BufferGeometry();
        this.material = material !== undefined ? material : new LineBasicMaterial();

        this.updateMorphTargets();

}

Line.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: Line,

        isLine: true,

        copy: function ( source ) {

                Object3D.prototype.copy.call( this, source );

                this.material = source.material;
                this.geometry = source.geometry;

                return this;

        },

        computeLineDistances: function () {

                const geometry = this.geometry;

                if ( geometry.isBufferGeometry ) {

                        // we assume non-indexed geometry

                        if ( geometry.index === null ) {

                                const positionAttribute = geometry.attributes.position;
                                const lineDistances = [ 0 ];

                                for ( let i = 1, l = positionAttribute.count; i < l; i ++ ) {

                                        _start.fromBufferAttribute( positionAttribute, i - 1 );
                                        _end.fromBufferAttribute( positionAttribute, i );

                                        lineDistances[ i ] = lineDistances[ i - 1 ];
                                        lineDistances[ i ] += _start.distanceTo( _end );

                                }

                                geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );

                        } else {

                                console.warn( 'THREE.Line.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );

                        }

                } else if ( geometry.isGeometry ) {

                        const vertices = geometry.vertices;
                        const lineDistances = geometry.lineDistances;

                        lineDistances[ 0 ] = 0;

                        for ( let i = 1, l = vertices.length; i < l; i ++ ) {

                                lineDistances[ i ] = lineDistances[ i - 1 ];
                                lineDistances[ i ] += vertices[ i - 1 ].distanceTo( vertices[ i ] );

                        }

                }

                return this;

        },

        raycast: function ( raycaster, intersects ) {

                const geometry = this.geometry;
                const matrixWorld = this.matrixWorld;
                const threshold = raycaster.params.Line.threshold;

                // Checking boundingSphere distance to ray

                if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

                _sphere$2.copy( geometry.boundingSphere );
                _sphere$2.applyMatrix4( matrixWorld );
                _sphere$2.radius += threshold;

                if ( raycaster.ray.intersectsSphere( _sphere$2 ) === false ) return;

                //

                _inverseMatrix$1.copy( matrixWorld ).invert();
                _ray$1.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$1 );

                const localThreshold = threshold / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );
                const localThresholdSq = localThreshold * localThreshold;

                const vStart = new Vector3();
                const vEnd = new Vector3();
                const interSegment = new Vector3();
                const interRay = new Vector3();
                const step = this.isLineSegments ? 2 : 1;

                if ( geometry.isBufferGeometry ) {

                        const index = geometry.index;
                        const attributes = geometry.attributes;
                        const positionAttribute = attributes.position;

                        if ( index !== null ) {

                                const indices = index.array;

                                for ( let i = 0, l = indices.length - 1; i < l; i += step ) {

                                        const a = indices[ i ];
                                        const b = indices[ i + 1 ];

                                        vStart.fromBufferAttribute( positionAttribute, a );
                                        vEnd.fromBufferAttribute( positionAttribute, b );

                                        const distSq = _ray$1.distanceSqToSegment( vStart, vEnd, interRay, interSegment );

                                        if ( distSq > localThresholdSq ) continue;

                                        interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation

                                        const distance = raycaster.ray.origin.distanceTo( interRay );

                                        if ( distance < raycaster.near || distance > raycaster.far ) continue;

                                        intersects.push( {

                                                distance: distance,
                                                // What do we want? intersection point on the ray or on the segment??
                                                // point: raycaster.ray.at( distance ),
                                                point: interSegment.clone().applyMatrix4( this.matrixWorld ),
                                                index: i,
                                                face: null,
                                                faceIndex: null,
                                                object: this

                                        } );

                                }

                        } else {

                                for ( let i = 0, l = positionAttribute.count - 1; i < l; i += step ) {

                                        vStart.fromBufferAttribute( positionAttribute, i );
                                        vEnd.fromBufferAttribute( positionAttribute, i + 1 );

                                        const distSq = _ray$1.distanceSqToSegment( vStart, vEnd, interRay, interSegment );

                                        if ( distSq > localThresholdSq ) continue;

                                        interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation

                                        const distance = raycaster.ray.origin.distanceTo( interRay );

                                        if ( distance < raycaster.near || distance > raycaster.far ) continue;

                                        intersects.push( {

                                                distance: distance,
                                                // What do we want? intersection point on the ray or on the segment??
                                                // point: raycaster.ray.at( distance ),
                                                point: interSegment.clone().applyMatrix4( this.matrixWorld ),
                                                index: i,
                                                face: null,
                                                faceIndex: null,
                                                object: this

                                        } );

                                }

                        }

                } else if ( geometry.isGeometry ) {

                        const vertices = geometry.vertices;
                        const nbVertices = vertices.length;

                        for ( let i = 0; i < nbVertices - 1; i += step ) {

                                const distSq = _ray$1.distanceSqToSegment( vertices[ i ], vertices[ i + 1 ], interRay, interSegment );

                                if ( distSq > localThresholdSq ) continue;

                                interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation

                                const distance = raycaster.ray.origin.distanceTo( interRay );

                                if ( distance < raycaster.near || distance > raycaster.far ) continue;

                                intersects.push( {

                                        distance: distance,
                                        // What do we want? intersection point on the ray or on the segment??
                                        // point: raycaster.ray.at( distance ),
                                        point: interSegment.clone().applyMatrix4( this.matrixWorld ),
                                        index: i,
                                        face: null,
                                        faceIndex: null,
                                        object: this

                                } );

                        }

                }

        },

        updateMorphTargets: function () {

                const geometry = this.geometry;

                if ( geometry.isBufferGeometry ) {

                        const morphAttributes = geometry.morphAttributes;
                        const keys = Object.keys( morphAttributes );

                        if ( keys.length > 0 ) {

                                const morphAttribute = morphAttributes[ keys[ 0 ] ];

                                if ( morphAttribute !== undefined ) {

                                        this.morphTargetInfluences = [];
                                        this.morphTargetDictionary = {};

                                        for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {

                                                const name = morphAttribute[ m ].name || String( m );

                                                this.morphTargetInfluences.push( 0 );
                                                this.morphTargetDictionary[ name ] = m;

                                        }

                                }

                        }

                } else {

                        const morphTargets = geometry.morphTargets;

                        if ( morphTargets !== undefined && morphTargets.length > 0 ) {

                                console.error( 'THREE.Line.updateMorphTargets() does not support THREE.Geometry. Use THREE.BufferGeometry instead.' );

                        }

                }

        }

} );

const _start$1 = new Vector3();
const _end$1 = new Vector3();

function LineSegments( geometry, material ) {

        Line.call( this, geometry, material );

        this.type = 'LineSegments';

}

LineSegments.prototype = Object.assign( Object.create( Line.prototype ), {

        constructor: LineSegments,

        isLineSegments: true,

        computeLineDistances: function () {

                const geometry = this.geometry;

                if ( geometry.isBufferGeometry ) {

                        // we assume non-indexed geometry

                        if ( geometry.index === null ) {

                                const positionAttribute = geometry.attributes.position;
                                const lineDistances = [];

                                for ( let i = 0, l = positionAttribute.count; i < l; i += 2 ) {

                                        _start$1.fromBufferAttribute( positionAttribute, i );
                                        _end$1.fromBufferAttribute( positionAttribute, i + 1 );

                                        lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
                                        lineDistances[ i + 1 ] = lineDistances[ i ] + _start$1.distanceTo( _end$1 );

                                }

                                geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );

                        } else {

                                console.warn( 'THREE.LineSegments.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );

                        }

                } else if ( geometry.isGeometry ) {

                        const vertices = geometry.vertices;
                        const lineDistances = geometry.lineDistances;

                        for ( let i = 0, l = vertices.length; i < l; i += 2 ) {

                                _start$1.copy( vertices[ i ] );
                                _end$1.copy( vertices[ i + 1 ] );

                                lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
                                lineDistances[ i + 1 ] = lineDistances[ i ] + _start$1.distanceTo( _end$1 );

                        }

                }

                return this;

        }

} );

function LineLoop( geometry, material ) {

        Line.call( this, geometry, material );

        this.type = 'LineLoop';

}

LineLoop.prototype = Object.assign( Object.create( Line.prototype ), {

        constructor: LineLoop,

        isLineLoop: true,

} );

/**
 * parameters = {
 *  color: <hex>,
 *  opacity: <float>,
 *  map: new THREE.Texture( <Image> ),
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  size: <float>,
 *  sizeAttenuation: <bool>
 *
 *  morphTargets: <bool>
 * }
 */

function PointsMaterial( parameters ) {

        Material.call( this );

        this.type = 'PointsMaterial';

        this.color = new Color( 0xffffff );

        this.map = null;

        this.alphaMap = null;

        this.size = 1;
        this.sizeAttenuation = true;

        this.morphTargets = false;

        this.setValues( parameters );

}

PointsMaterial.prototype = Object.create( Material.prototype );
PointsMaterial.prototype.constructor = PointsMaterial;

PointsMaterial.prototype.isPointsMaterial = true;

PointsMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.color.copy( source.color );

        this.map = source.map;

        this.alphaMap = source.alphaMap;

        this.size = source.size;
        this.sizeAttenuation = source.sizeAttenuation;

        this.morphTargets = source.morphTargets;

        return this;

};

const _inverseMatrix$2 = new Matrix4();
const _ray$2 = new Ray();
const _sphere$3 = new Sphere();
const _position$1 = new Vector3();

function Points( geometry, material ) {

        Object3D.call( this );

        this.type = 'Points';

        this.geometry = geometry !== undefined ? geometry : new BufferGeometry();
        this.material = material !== undefined ? material : new PointsMaterial();

        this.updateMorphTargets();

}

Points.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: Points,

        isPoints: true,

        copy: function ( source ) {

                Object3D.prototype.copy.call( this, source );

                this.material = source.material;
                this.geometry = source.geometry;

                return this;

        },

        raycast: function ( raycaster, intersects ) {

                const geometry = this.geometry;
                const matrixWorld = this.matrixWorld;
                const threshold = raycaster.params.Points.threshold;

                // Checking boundingSphere distance to ray

                if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

                _sphere$3.copy( geometry.boundingSphere );
                _sphere$3.applyMatrix4( matrixWorld );
                _sphere$3.radius += threshold;

                if ( raycaster.ray.intersectsSphere( _sphere$3 ) === false ) return;

                //

                _inverseMatrix$2.copy( matrixWorld ).invert();
                _ray$2.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$2 );

                const localThreshold = threshold / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );
                const localThresholdSq = localThreshold * localThreshold;

                if ( geometry.isBufferGeometry ) {

                        const index = geometry.index;
                        const attributes = geometry.attributes;
                        const positionAttribute = attributes.position;

                        if ( index !== null ) {

                                const indices = index.array;

                                for ( let i = 0, il = indices.length; i < il; i ++ ) {

                                        const a = indices[ i ];

                                        _position$1.fromBufferAttribute( positionAttribute, a );

                                        testPoint( _position$1, a, localThresholdSq, matrixWorld, raycaster, intersects, this );

                                }

                        } else {

                                for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {

                                        _position$1.fromBufferAttribute( positionAttribute, i );

                                        testPoint( _position$1, i, localThresholdSq, matrixWorld, raycaster, intersects, this );

                                }

                        }

                } else {

                        const vertices = geometry.vertices;

                        for ( let i = 0, l = vertices.length; i < l; i ++ ) {

                                testPoint( vertices[ i ], i, localThresholdSq, matrixWorld, raycaster, intersects, this );

                        }

                }

        },

        updateMorphTargets: function () {

                const geometry = this.geometry;

                if ( geometry.isBufferGeometry ) {

                        const morphAttributes = geometry.morphAttributes;
                        const keys = Object.keys( morphAttributes );

                        if ( keys.length > 0 ) {

                                const morphAttribute = morphAttributes[ keys[ 0 ] ];

                                if ( morphAttribute !== undefined ) {

                                        this.morphTargetInfluences = [];
                                        this.morphTargetDictionary = {};

                                        for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {

                                                const name = morphAttribute[ m ].name || String( m );

                                                this.morphTargetInfluences.push( 0 );
                                                this.morphTargetDictionary[ name ] = m;

                                        }

                                }

                        }

                } else {

                        const morphTargets = geometry.morphTargets;

                        if ( morphTargets !== undefined && morphTargets.length > 0 ) {

                                console.error( 'THREE.Points.updateMorphTargets() does not support THREE.Geometry. Use THREE.BufferGeometry instead.' );

                        }

                }

        }

} );

function testPoint( point, index, localThresholdSq, matrixWorld, raycaster, intersects, object ) {

        const rayPointDistanceSq = _ray$2.distanceSqToPoint( point );

        if ( rayPointDistanceSq < localThresholdSq ) {

                const intersectPoint = new Vector3();

                _ray$2.closestPointToPoint( point, intersectPoint );
                intersectPoint.applyMatrix4( matrixWorld );

                const distance = raycaster.ray.origin.distanceTo( intersectPoint );

                if ( distance < raycaster.near || distance > raycaster.far ) return;

                intersects.push( {

                        distance: distance,
                        distanceToRay: Math.sqrt( rayPointDistanceSq ),
                        point: intersectPoint,
                        index: index,
                        face: null,
                        object: object

                } );

        }

}

function VideoTexture( video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy ) {

        Texture.call( this, video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

        this.format = format !== undefined ? format : RGBFormat;

        this.minFilter = minFilter !== undefined ? minFilter : LinearFilter;
        this.magFilter = magFilter !== undefined ? magFilter : LinearFilter;

        this.generateMipmaps = false;

        const scope = this;

        function updateVideo() {

                scope.needsUpdate = true;
                video.requestVideoFrameCallback( updateVideo );

        }

        if ( 'requestVideoFrameCallback' in video ) {

                video.requestVideoFrameCallback( updateVideo );

        }

}

VideoTexture.prototype = Object.assign( Object.create( Texture.prototype ), {

        constructor: VideoTexture,

        clone: function () {

                return new this.constructor( this.image ).copy( this );

        },

        isVideoTexture: true,

        update: function () {

                const video = this.image;
                const hasVideoFrameCallback = 'requestVideoFrameCallback' in video;

                if ( hasVideoFrameCallback === false && video.readyState >= video.HAVE_CURRENT_DATA ) {

                        this.needsUpdate = true;

                }

        }

} );

function CompressedTexture( mipmaps, width, height, format, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, encoding ) {

        Texture.call( this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding );

        this.image = { width: width, height: height };
        this.mipmaps = mipmaps;

        // no flipping for cube textures
        // (also flipping doesn't work for compressed textures )

        this.flipY = false;

        // can't generate mipmaps for compressed textures
        // mips must be embedded in DDS files

        this.generateMipmaps = false;

}

CompressedTexture.prototype = Object.create( Texture.prototype );
CompressedTexture.prototype.constructor = CompressedTexture;

CompressedTexture.prototype.isCompressedTexture = true;

function CanvasTexture( canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy ) {

        Texture.call( this, canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

        this.needsUpdate = true;

}

CanvasTexture.prototype = Object.create( Texture.prototype );
CanvasTexture.prototype.constructor = CanvasTexture;
CanvasTexture.prototype.isCanvasTexture = true;

function DepthTexture( width, height, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, format ) {

        format = format !== undefined ? format : DepthFormat;

        if ( format !== DepthFormat && format !== DepthStencilFormat ) {

                throw new Error( 'DepthTexture format must be either THREE.DepthFormat or THREE.DepthStencilFormat' );

        }

        if ( type === undefined && format === DepthFormat ) type = UnsignedShortType;
        if ( type === undefined && format === DepthStencilFormat ) type = UnsignedInt248Type;

        Texture.call( this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

        this.image = { width: width, height: height };

        this.magFilter = magFilter !== undefined ? magFilter : NearestFilter;
        this.minFilter = minFilter !== undefined ? minFilter : NearestFilter;

        this.flipY = false;
        this.generateMipmaps = false;

}

DepthTexture.prototype = Object.create( Texture.prototype );
DepthTexture.prototype.constructor = DepthTexture;
DepthTexture.prototype.isDepthTexture = true;

let _geometryId = 0; // Geometry uses even numbers as Id
const _m1$3 = new Matrix4();
const _obj$1 = new Object3D();
const _offset$1 = new Vector3();

function Geometry() {

        Object.defineProperty( this, 'id', { value: _geometryId += 2 } );

        this.uuid = MathUtils.generateUUID();

        this.name = '';
        this.type = 'Geometry';

        this.vertices = [];
        this.colors = [];
        this.faces = [];
        this.faceVertexUvs = [[]];

        this.morphTargets = [];
        this.morphNormals = [];

        this.skinWeights = [];
        this.skinIndices = [];

        this.lineDistances = [];

        this.boundingBox = null;
        this.boundingSphere = null;

        // update flags

        this.elementsNeedUpdate = false;
        this.verticesNeedUpdate = false;
        this.uvsNeedUpdate = false;
        this.normalsNeedUpdate = false;
        this.colorsNeedUpdate = false;
        this.lineDistancesNeedUpdate = false;
        this.groupsNeedUpdate = false;

}

Geometry.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

        constructor: Geometry,

        isGeometry: true,

        applyMatrix4: function ( matrix ) {

                const normalMatrix = new Matrix3().getNormalMatrix( matrix );

                for ( let i = 0, il = this.vertices.length; i < il; i ++ ) {

                        const vertex = this.vertices[ i ];
                        vertex.applyMatrix4( matrix );

                }

                for ( let i = 0, il = this.faces.length; i < il; i ++ ) {

                        const face = this.faces[ i ];
                        face.normal.applyMatrix3( normalMatrix ).normalize();

                        for ( let j = 0, jl = face.vertexNormals.length; j < jl; j ++ ) {

                                face.vertexNormals[ j ].applyMatrix3( normalMatrix ).normalize();

                        }

                }

                if ( this.boundingBox !== null ) {

                        this.computeBoundingBox();

                }

                if ( this.boundingSphere !== null ) {

                        this.computeBoundingSphere();

                }

                this.verticesNeedUpdate = true;
                this.normalsNeedUpdate = true;

                return this;

        },

        rotateX: function ( angle ) {

                // rotate geometry around world x-axis

                _m1$3.makeRotationX( angle );

                this.applyMatrix4( _m1$3 );

                return this;

        },

        rotateY: function ( angle ) {

                // rotate geometry around world y-axis

                _m1$3.makeRotationY( angle );

                this.applyMatrix4( _m1$3 );

                return this;

        },

        rotateZ: function ( angle ) {

                // rotate geometry around world z-axis

                _m1$3.makeRotationZ( angle );

                this.applyMatrix4( _m1$3 );

                return this;

        },

        translate: function ( x, y, z ) {

                // translate geometry

                _m1$3.makeTranslation( x, y, z );

                this.applyMatrix4( _m1$3 );

                return this;

        },

        scale: function ( x, y, z ) {

                // scale geometry

                _m1$3.makeScale( x, y, z );

                this.applyMatrix4( _m1$3 );

                return this;

        },

        lookAt: function ( vector ) {

                _obj$1.lookAt( vector );

                _obj$1.updateMatrix();

                this.applyMatrix4( _obj$1.matrix );

                return this;

        },

        fromBufferGeometry: function ( geometry ) {

                const scope = this;

                const index = geometry.index !== null ? geometry.index : undefined;
                const attributes = geometry.attributes;

                if ( attributes.position === undefined ) {

                        console.error( 'THREE.Geometry.fromBufferGeometry(): Position attribute required for conversion.' );
                        return this;

                }

                const position = attributes.position;
                const normal = attributes.normal;
                const color = attributes.color;
                const uv = attributes.uv;
                const uv2 = attributes.uv2;

                if ( uv2 !== undefined ) this.faceVertexUvs[ 1 ] = [];

                for ( let i = 0; i < position.count; i ++ ) {

                        scope.vertices.push( new Vector3().fromBufferAttribute( position, i ) );

                        if ( color !== undefined ) {

                                scope.colors.push( new Color().fromBufferAttribute( color, i ) );

                        }

                }

                function addFace( a, b, c, materialIndex ) {

                        const vertexColors = ( color === undefined ) ? [] : [
                                scope.colors[ a ].clone(),
                                scope.colors[ b ].clone(),
                                scope.colors[ c ].clone()
                        ];

                        const vertexNormals = ( normal === undefined ) ? [] : [
                                new Vector3().fromBufferAttribute( normal, a ),
                                new Vector3().fromBufferAttribute( normal, b ),
                                new Vector3().fromBufferAttribute( normal, c )
                        ];

                        const face = new Face3( a, b, c, vertexNormals, vertexColors, materialIndex );

                        scope.faces.push( face );

                        if ( uv !== undefined ) {

                                scope.faceVertexUvs[ 0 ].push( [
                                        new Vector2().fromBufferAttribute( uv, a ),
                                        new Vector2().fromBufferAttribute( uv, b ),
                                        new Vector2().fromBufferAttribute( uv, c )
                                ] );

                        }

                        if ( uv2 !== undefined ) {

                                scope.faceVertexUvs[ 1 ].push( [
                                        new Vector2().fromBufferAttribute( uv2, a ),
                                        new Vector2().fromBufferAttribute( uv2, b ),
                                        new Vector2().fromBufferAttribute( uv2, c )
                                ] );

                        }

                }

                const groups = geometry.groups;

                if ( groups.length > 0 ) {

                        for ( let i = 0; i < groups.length; i ++ ) {

                                const group = groups[ i ];

                                const start = group.start;
                                const count = group.count;

                                for ( let j = start, jl = start + count; j < jl; j += 3 ) {

                                        if ( index !== undefined ) {

                                                addFace( index.getX( j ), index.getX( j + 1 ), index.getX( j + 2 ), group.materialIndex );

                                        } else {

                                                addFace( j, j + 1, j + 2, group.materialIndex );

                                        }

                                }

                        }

                } else {

                        if ( index !== undefined ) {

                                for ( let i = 0; i < index.count; i += 3 ) {

                                        addFace( index.getX( i ), index.getX( i + 1 ), index.getX( i + 2 ) );

                                }

                        } else {

                                for ( let i = 0; i < position.count; i += 3 ) {

                                        addFace( i, i + 1, i + 2 );

                                }

                        }

                }

                this.computeFaceNormals();

                if ( geometry.boundingBox !== null ) {

                        this.boundingBox = geometry.boundingBox.clone();

                }

                if ( geometry.boundingSphere !== null ) {

                        this.boundingSphere = geometry.boundingSphere.clone();

                }

                return this;

        },

        center: function () {

                this.computeBoundingBox();

                this.boundingBox.getCenter( _offset$1 ).negate();

                this.translate( _offset$1.x, _offset$1.y, _offset$1.z );

                return this;

        },

        normalize: function () {

                this.computeBoundingSphere();

                const center = this.boundingSphere.center;
                const radius = this.boundingSphere.radius;

                const s = radius === 0 ? 1 : 1.0 / radius;

                const matrix = new Matrix4();
                matrix.set(
                        s, 0, 0, - s * center.x,
                        0, s, 0, - s * center.y,
                        0, 0, s, - s * center.z,
                        0, 0, 0, 1
                );

                this.applyMatrix4( matrix );

                return this;

        },

        computeFaceNormals: function () {

                const cb = new Vector3(), ab = new Vector3();

                for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                        const face = this.faces[ f ];

                        const vA = this.vertices[ face.a ];
                        const vB = this.vertices[ face.b ];
                        const vC = this.vertices[ face.c ];

                        cb.subVectors( vC, vB );
                        ab.subVectors( vA, vB );
                        cb.cross( ab );

                        cb.normalize();

                        face.normal.copy( cb );

                }

        },

        computeVertexNormals: function ( areaWeighted = true ) {

                const vertices = new Array( this.vertices.length );

                for ( let v = 0, vl = this.vertices.length; v < vl; v ++ ) {

                        vertices[ v ] = new Vector3();

                }

                if ( areaWeighted ) {

                        // vertex normals weighted by triangle areas
                        // http://www.iquilezles.org/www/articles/normals/normals.htm

                        const cb = new Vector3(), ab = new Vector3();

                        for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                                const face = this.faces[ f ];

                                const vA = this.vertices[ face.a ];
                                const vB = this.vertices[ face.b ];
                                const vC = this.vertices[ face.c ];

                                cb.subVectors( vC, vB );
                                ab.subVectors( vA, vB );
                                cb.cross( ab );

                                vertices[ face.a ].add( cb );
                                vertices[ face.b ].add( cb );
                                vertices[ face.c ].add( cb );

                        }

                } else {

                        this.computeFaceNormals();

                        for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                                const face = this.faces[ f ];

                                vertices[ face.a ].add( face.normal );
                                vertices[ face.b ].add( face.normal );
                                vertices[ face.c ].add( face.normal );

                        }

                }

                for ( let v = 0, vl = this.vertices.length; v < vl; v ++ ) {

                        vertices[ v ].normalize();

                }

                for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                        const face = this.faces[ f ];

                        const vertexNormals = face.vertexNormals;

                        if ( vertexNormals.length === 3 ) {

                                vertexNormals[ 0 ].copy( vertices[ face.a ] );
                                vertexNormals[ 1 ].copy( vertices[ face.b ] );
                                vertexNormals[ 2 ].copy( vertices[ face.c ] );

                        } else {

                                vertexNormals[ 0 ] = vertices[ face.a ].clone();
                                vertexNormals[ 1 ] = vertices[ face.b ].clone();
                                vertexNormals[ 2 ] = vertices[ face.c ].clone();

                        }

                }

                if ( this.faces.length > 0 ) {

                        this.normalsNeedUpdate = true;

                }

        },

        computeFlatVertexNormals: function () {

                this.computeFaceNormals();

                for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                        const face = this.faces[ f ];

                        const vertexNormals = face.vertexNormals;

                        if ( vertexNormals.length === 3 ) {

                                vertexNormals[ 0 ].copy( face.normal );
                                vertexNormals[ 1 ].copy( face.normal );
                                vertexNormals[ 2 ].copy( face.normal );

                        } else {

                                vertexNormals[ 0 ] = face.normal.clone();
                                vertexNormals[ 1 ] = face.normal.clone();
                                vertexNormals[ 2 ] = face.normal.clone();

                        }

                }

                if ( this.faces.length > 0 ) {

                        this.normalsNeedUpdate = true;

                }

        },

        computeMorphNormals: function () {

                // save original normals
                // - create temp variables on first access
                //   otherwise just copy (for faster repeated calls)

                for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                        const face = this.faces[ f ];

                        if ( ! face.__originalFaceNormal ) {

                                face.__originalFaceNormal = face.normal.clone();

                        } else {

                                face.__originalFaceNormal.copy( face.normal );

                        }

                        if ( ! face.__originalVertexNormals ) face.__originalVertexNormals = [];

                        for ( let i = 0, il = face.vertexNormals.length; i < il; i ++ ) {

                                if ( ! face.__originalVertexNormals[ i ] ) {

                                        face.__originalVertexNormals[ i ] = face.vertexNormals[ i ].clone();

                                } else {

                                        face.__originalVertexNormals[ i ].copy( face.vertexNormals[ i ] );

                                }

                        }

                }

                // use temp geometry to compute face and vertex normals for each morph

                const tmpGeo = new Geometry();
                tmpGeo.faces = this.faces;

                for ( let i = 0, il = this.morphTargets.length; i < il; i ++ ) {

                        // create on first access

                        if ( ! this.morphNormals[ i ] ) {

                                this.morphNormals[ i ] = {};
                                this.morphNormals[ i ].faceNormals = [];
                                this.morphNormals[ i ].vertexNormals = [];

                                const dstNormalsFace = this.morphNormals[ i ].faceNormals;
                                const dstNormalsVertex = this.morphNormals[ i ].vertexNormals;

                                for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                                        const faceNormal = new Vector3();
                                        const vertexNormals = { a: new Vector3(), b: new Vector3(), c: new Vector3() };

                                        dstNormalsFace.push( faceNormal );
                                        dstNormalsVertex.push( vertexNormals );

                                }

                        }

                        const morphNormals = this.morphNormals[ i ];

                        // set vertices to morph target

                        tmpGeo.vertices = this.morphTargets[ i ].vertices;

                        // compute morph normals

                        tmpGeo.computeFaceNormals();
                        tmpGeo.computeVertexNormals();

                        // store morph normals

                        for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                                const face = this.faces[ f ];

                                const faceNormal = morphNormals.faceNormals[ f ];
                                const vertexNormals = morphNormals.vertexNormals[ f ];

                                faceNormal.copy( face.normal );

                                vertexNormals.a.copy( face.vertexNormals[ 0 ] );
                                vertexNormals.b.copy( face.vertexNormals[ 1 ] );
                                vertexNormals.c.copy( face.vertexNormals[ 2 ] );

                        }

                }

                // restore original normals

                for ( let f = 0, fl = this.faces.length; f < fl; f ++ ) {

                        const face = this.faces[ f ];

                        face.normal = face.__originalFaceNormal;
                        face.vertexNormals = face.__originalVertexNormals;

                }

        },

        computeBoundingBox: function () {

                if ( this.boundingBox === null ) {

                        this.boundingBox = new Box3();

                }

                this.boundingBox.setFromPoints( this.vertices );

        },

        computeBoundingSphere: function () {

                if ( this.boundingSphere === null ) {

                        this.boundingSphere = new Sphere();

                }

                this.boundingSphere.setFromPoints( this.vertices );

        },

        merge: function ( geometry, matrix, materialIndexOffset = 0 ) {

                if ( ! ( geometry && geometry.isGeometry ) ) {

                        console.error( 'THREE.Geometry.merge(): geometry not an instance of THREE.Geometry.', geometry );
                        return;

                }

                let normalMatrix;
                const vertexOffset = this.vertices.length,
                        vertices1 = this.vertices,
                        vertices2 = geometry.vertices,
                        faces1 = this.faces,
                        faces2 = geometry.faces,
                        colors1 = this.colors,
                        colors2 = geometry.colors;

                if ( matrix !== undefined ) {

                        normalMatrix = new Matrix3().getNormalMatrix( matrix );

                }

                // vertices

                for ( let i = 0, il = vertices2.length; i < il; i ++ ) {

                        const vertex = vertices2[ i ];

                        const vertexCopy = vertex.clone();

                        if ( matrix !== undefined ) vertexCopy.applyMatrix4( matrix );

                        vertices1.push( vertexCopy );

                }

                // colors

                for ( let i = 0, il = colors2.length; i < il; i ++ ) {

                        colors1.push( colors2[ i ].clone() );

                }

                // faces

                for ( let i = 0, il = faces2.length; i < il; i ++ ) {

                        const face = faces2[ i ];
                        let normal, color;
                        const faceVertexNormals = face.vertexNormals,
                                faceVertexColors = face.vertexColors;

                        const faceCopy = new Face3( face.a + vertexOffset, face.b + vertexOffset, face.c + vertexOffset );
                        faceCopy.normal.copy( face.normal );

                        if ( normalMatrix !== undefined ) {

                                faceCopy.normal.applyMatrix3( normalMatrix ).normalize();

                        }

                        for ( let j = 0, jl = faceVertexNormals.length; j < jl; j ++ ) {

                                normal = faceVertexNormals[ j ].clone();

                                if ( normalMatrix !== undefined ) {

                                        normal.applyMatrix3( normalMatrix ).normalize();

                                }

                                faceCopy.vertexNormals.push( normal );

                        }

                        faceCopy.color.copy( face.color );

                        for ( let j = 0, jl = faceVertexColors.length; j < jl; j ++ ) {

                                color = faceVertexColors[ j ];
                                faceCopy.vertexColors.push( color.clone() );

                        }

                        faceCopy.materialIndex = face.materialIndex + materialIndexOffset;

                        faces1.push( faceCopy );

                }

                // uvs

                for ( let i = 0, il = geometry.faceVertexUvs.length; i < il; i ++ ) {

                        const faceVertexUvs2 = geometry.faceVertexUvs[ i ];

                        if ( this.faceVertexUvs[ i ] === undefined ) this.faceVertexUvs[ i ] = [];

                        for ( let j = 0, jl = faceVertexUvs2.length; j < jl; j ++ ) {

                                const uvs2 = faceVertexUvs2[ j ], uvsCopy = [];

                                for ( let k = 0, kl = uvs2.length; k < kl; k ++ ) {

                                        uvsCopy.push( uvs2[ k ].clone() );

                                }

                                this.faceVertexUvs[ i ].push( uvsCopy );

                        }

                }

        },

        mergeMesh: function ( mesh ) {

                if ( ! ( mesh && mesh.isMesh ) ) {

                        console.error( 'THREE.Geometry.mergeMesh(): mesh not an instance of THREE.Mesh.', mesh );
                        return;

                }

                if ( mesh.matrixAutoUpdate ) mesh.updateMatrix();

                this.merge( mesh.geometry, mesh.matrix );

        },

        /*
         * Checks for duplicate vertices with hashmap.
         * Duplicated vertices are removed
         * and faces' vertices are updated.
         */

        mergeVertices: function ( precisionPoints = 4 ) {

                const verticesMap = {}; // Hashmap for looking up vertices by position coordinates (and making sure they are unique)
                const unique = [], changes = [];

                const precision = Math.pow( 10, precisionPoints );

                for ( let i = 0, il = this.vertices.length; i < il; i ++ ) {

                        const v = this.vertices[ i ];
                        const key = Math.round( v.x * precision ) + '_' + Math.round( v.y * precision ) + '_' + Math.round( v.z * precision );

                        if ( verticesMap[ key ] === undefined ) {

                                verticesMap[ key ] = i;
                                unique.push( this.vertices[ i ] );
                                changes[ i ] = unique.length - 1;

                        } else {

                                //console.log('Duplicate vertex found. ', i, ' could be using ', verticesMap[key]);
                                changes[ i ] = changes[ verticesMap[ key ] ];

                        }

                }


                // if faces are completely degenerate after merging vertices, we
                // have to remove them from the geometry.
                const faceIndicesToRemove = [];

                for ( let i = 0, il = this.faces.length; i < il; i ++ ) {

                        const face = this.faces[ i ];

                        face.a = changes[ face.a ];
                        face.b = changes[ face.b ];
                        face.c = changes[ face.c ];

                        const indices = [ face.a, face.b, face.c ];

                        // if any duplicate vertices are found in a Face3
                        // we have to remove the face as nothing can be saved
                        for ( let n = 0; n < 3; n ++ ) {

                                if ( indices[ n ] === indices[ ( n + 1 ) % 3 ] ) {

                                        faceIndicesToRemove.push( i );
                                        break;

                                }

                        }

                }

                for ( let i = faceIndicesToRemove.length - 1; i >= 0; i -- ) {

                        const idx = faceIndicesToRemove[ i ];

                        this.faces.splice( idx, 1 );

                        for ( let j = 0, jl = this.faceVertexUvs.length; j < jl; j ++ ) {

                                this.faceVertexUvs[ j ].splice( idx, 1 );

                        }

                }

                // Use unique set of vertices

                const diff = this.vertices.length - unique.length;
                this.vertices = unique;
                return diff;

        },

        setFromPoints: function ( points ) {

                this.vertices = [];

                for ( let i = 0, l = points.length; i < l; i ++ ) {

                        const point = points[ i ];
                        this.vertices.push( new Vector3( point.x, point.y, point.z || 0 ) );

                }

                return this;

        },

        sortFacesByMaterialIndex: function () {

                const faces = this.faces;
                const length = faces.length;

                // tag faces

                for ( let i = 0; i < length; i ++ ) {

                        faces[ i ]._id = i;

                }

                // sort faces

                function materialIndexSort( a, b ) {

                        return a.materialIndex - b.materialIndex;

                }

                faces.sort( materialIndexSort );

                // sort uvs

                const uvs1 = this.faceVertexUvs[ 0 ];
                const uvs2 = this.faceVertexUvs[ 1 ];

                let newUvs1, newUvs2;

                if ( uvs1 && uvs1.length === length ) newUvs1 = [];
                if ( uvs2 && uvs2.length === length ) newUvs2 = [];

                for ( let i = 0; i < length; i ++ ) {

                        const id = faces[ i ]._id;

                        if ( newUvs1 ) newUvs1.push( uvs1[ id ] );
                        if ( newUvs2 ) newUvs2.push( uvs2[ id ] );

                }

                if ( newUvs1 ) this.faceVertexUvs[ 0 ] = newUvs1;
                if ( newUvs2 ) this.faceVertexUvs[ 1 ] = newUvs2;

        },

        toJSON: function () {

                const data = {
                        metadata: {
                                version: 4.5,
                                type: 'Geometry',
                                generator: 'Geometry.toJSON'
                        }
                };

                // standard Geometry serialization

                data.uuid = this.uuid;
                data.type = this.type;
                if ( this.name !== '' ) data.name = this.name;

                if ( this.parameters !== undefined ) {

                        const parameters = this.parameters;

                        for ( const key in parameters ) {

                                if ( parameters[ key ] !== undefined ) data[ key ] = parameters[ key ];

                        }

                        return data;

                }

                const vertices = [];

                for ( let i = 0; i < this.vertices.length; i ++ ) {

                        const vertex = this.vertices[ i ];
                        vertices.push( vertex.x, vertex.y, vertex.z );

                }

                const faces = [];
                const normals = [];
                const normalsHash = {};
                const colors = [];
                const colorsHash = {};
                const uvs = [];
                const uvsHash = {};

                for ( let i = 0; i < this.faces.length; i ++ ) {

                        const face = this.faces[ i ];

                        const hasMaterial = true;
                        const hasFaceUv = false; // deprecated
                        const hasFaceVertexUv = this.faceVertexUvs[ 0 ][ i ] !== undefined;
                        const hasFaceNormal = face.normal.length() > 0;
                        const hasFaceVertexNormal = face.vertexNormals.length > 0;
                        const hasFaceColor = face.color.r !== 1 || face.color.g !== 1 || face.color.b !== 1;
                        const hasFaceVertexColor = face.vertexColors.length > 0;

                        let faceType = 0;

                        faceType = setBit( faceType, 0, 0 ); // isQuad
                        faceType = setBit( faceType, 1, hasMaterial );
                        faceType = setBit( faceType, 2, hasFaceUv );
                        faceType = setBit( faceType, 3, hasFaceVertexUv );
                        faceType = setBit( faceType, 4, hasFaceNormal );
                        faceType = setBit( faceType, 5, hasFaceVertexNormal );
                        faceType = setBit( faceType, 6, hasFaceColor );
                        faceType = setBit( faceType, 7, hasFaceVertexColor );

                        faces.push( faceType );
                        faces.push( face.a, face.b, face.c );
                        faces.push( face.materialIndex );

                        if ( hasFaceVertexUv ) {

                                const faceVertexUvs = this.faceVertexUvs[ 0 ][ i ];

                                faces.push(
                                        getUvIndex( faceVertexUvs[ 0 ] ),
                                        getUvIndex( faceVertexUvs[ 1 ] ),
                                        getUvIndex( faceVertexUvs[ 2 ] )
                                );

                        }

                        if ( hasFaceNormal ) {

                                faces.push( getNormalIndex( face.normal ) );

                        }

                        if ( hasFaceVertexNormal ) {

                                const vertexNormals = face.vertexNormals;

                                faces.push(
                                        getNormalIndex( vertexNormals[ 0 ] ),
                                        getNormalIndex( vertexNormals[ 1 ] ),
                                        getNormalIndex( vertexNormals[ 2 ] )
                                );

                        }

                        if ( hasFaceColor ) {

                                faces.push( getColorIndex( face.color ) );

                        }

                        if ( hasFaceVertexColor ) {

                                const vertexColors = face.vertexColors;

                                faces.push(
                                        getColorIndex( vertexColors[ 0 ] ),
                                        getColorIndex( vertexColors[ 1 ] ),
                                        getColorIndex( vertexColors[ 2 ] )
                                );

                        }

                }

                function setBit( value, position, enabled ) {

                        return enabled ? value | ( 1 << position ) : value & ( ~ ( 1 << position ) );

                }

                function getNormalIndex( normal ) {

                        const hash = normal.x.toString() + normal.y.toString() + normal.z.toString();

                        if ( normalsHash[ hash ] !== undefined ) {

                                return normalsHash[ hash ];

                        }

                        normalsHash[ hash ] = normals.length / 3;
                        normals.push( normal.x, normal.y, normal.z );

                        return normalsHash[ hash ];

                }

                function getColorIndex( color ) {

                        const hash = color.r.toString() + color.g.toString() + color.b.toString();

                        if ( colorsHash[ hash ] !== undefined ) {

                                return colorsHash[ hash ];

                        }

                        colorsHash[ hash ] = colors.length;
                        colors.push( color.getHex() );

                        return colorsHash[ hash ];

                }

                function getUvIndex( uv ) {

                        const hash = uv.x.toString() + uv.y.toString();

                        if ( uvsHash[ hash ] !== undefined ) {

                                return uvsHash[ hash ];

                        }

                        uvsHash[ hash ] = uvs.length / 2;
                        uvs.push( uv.x, uv.y );

                        return uvsHash[ hash ];

                }

                data.data = {};

                data.data.vertices = vertices;
                data.data.normals = normals;
                if ( colors.length > 0 ) data.data.colors = colors;
                if ( uvs.length > 0 ) data.data.uvs = [ uvs ]; // temporal backward compatibility
                data.data.faces = faces;

                return data;

        },

        clone: function () {

                /*
                 // Handle primitives

                 const parameters = this.parameters;

                 if ( parameters !== undefined ) {

                 const values = [];

                 for ( const key in parameters ) {

                 values.push( parameters[ key ] );

                 }

                 const geometry = Object.create( this.constructor.prototype );
                 this.constructor.apply( geometry, values );
                 return geometry;

                 }

                 return new this.constructor().copy( this );
                 */

                return new Geometry().copy( this );

        },

        copy: function ( source ) {

                // reset

                this.vertices = [];
                this.colors = [];
                this.faces = [];
                this.faceVertexUvs = [[]];
                this.morphTargets = [];
                this.morphNormals = [];
                this.skinWeights = [];
                this.skinIndices = [];
                this.lineDistances = [];
                this.boundingBox = null;
                this.boundingSphere = null;

                // name

                this.name = source.name;

                // vertices

                const vertices = source.vertices;

                for ( let i = 0, il = vertices.length; i < il; i ++ ) {

                        this.vertices.push( vertices[ i ].clone() );

                }

                // colors

                const colors = source.colors;

                for ( let i = 0, il = colors.length; i < il; i ++ ) {

                        this.colors.push( colors[ i ].clone() );

                }

                // faces

                const faces = source.faces;

                for ( let i = 0, il = faces.length; i < il; i ++ ) {

                        this.faces.push( faces[ i ].clone() );

                }

                // face vertex uvs

                for ( let i = 0, il = source.faceVertexUvs.length; i < il; i ++ ) {

                        const faceVertexUvs = source.faceVertexUvs[ i ];

                        if ( this.faceVertexUvs[ i ] === undefined ) {

                                this.faceVertexUvs[ i ] = [];

                        }

                        for ( let j = 0, jl = faceVertexUvs.length; j < jl; j ++ ) {

                                const uvs = faceVertexUvs[ j ], uvsCopy = [];

                                for ( let k = 0, kl = uvs.length; k < kl; k ++ ) {

                                        const uv = uvs[ k ];

                                        uvsCopy.push( uv.clone() );

                                }

                                this.faceVertexUvs[ i ].push( uvsCopy );

                        }

                }

                // morph targets

                const morphTargets = source.morphTargets;

                for ( let i = 0, il = morphTargets.length; i < il; i ++ ) {

                        const morphTarget = {};
                        morphTarget.name = morphTargets[ i ].name;

                        // vertices

                        if ( morphTargets[ i ].vertices !== undefined ) {

                                morphTarget.vertices = [];

                                for ( let j = 0, jl = morphTargets[ i ].vertices.length; j < jl; j ++ ) {

                                        morphTarget.vertices.push( morphTargets[ i ].vertices[ j ].clone() );

                                }

                        }

                        // normals

                        if ( morphTargets[ i ].normals !== undefined ) {

                                morphTarget.normals = [];

                                for ( let j = 0, jl = morphTargets[ i ].normals.length; j < jl; j ++ ) {

                                        morphTarget.normals.push( morphTargets[ i ].normals[ j ].clone() );

                                }

                        }

                        this.morphTargets.push( morphTarget );

                }

                // morph normals

                const morphNormals = source.morphNormals;

                for ( let i = 0, il = morphNormals.length; i < il; i ++ ) {

                        const morphNormal = {};

                        // vertex normals

                        if ( morphNormals[ i ].vertexNormals !== undefined ) {

                                morphNormal.vertexNormals = [];

                                for ( let j = 0, jl = morphNormals[ i ].vertexNormals.length; j < jl; j ++ ) {

                                        const srcVertexNormal = morphNormals[ i ].vertexNormals[ j ];
                                        const destVertexNormal = {};

                                        destVertexNormal.a = srcVertexNormal.a.clone();
                                        destVertexNormal.b = srcVertexNormal.b.clone();
                                        destVertexNormal.c = srcVertexNormal.c.clone();

                                        morphNormal.vertexNormals.push( destVertexNormal );

                                }

                        }

                        // face normals

                        if ( morphNormals[ i ].faceNormals !== undefined ) {

                                morphNormal.faceNormals = [];

                                for ( let j = 0, jl = morphNormals[ i ].faceNormals.length; j < jl; j ++ ) {

                                        morphNormal.faceNormals.push( morphNormals[ i ].faceNormals[ j ].clone() );

                                }

                        }

                        this.morphNormals.push( morphNormal );

                }

                // skin weights

                const skinWeights = source.skinWeights;

                for ( let i = 0, il = skinWeights.length; i < il; i ++ ) {

                        this.skinWeights.push( skinWeights[ i ].clone() );

                }

                // skin indices

                const skinIndices = source.skinIndices;

                for ( let i = 0, il = skinIndices.length; i < il; i ++ ) {

                        this.skinIndices.push( skinIndices[ i ].clone() );

                }

                // line distances

                const lineDistances = source.lineDistances;

                for ( let i = 0, il = lineDistances.length; i < il; i ++ ) {

                        this.lineDistances.push( lineDistances[ i ] );

                }

                // bounding box

                const boundingBox = source.boundingBox;

                if ( boundingBox !== null ) {

                        this.boundingBox = boundingBox.clone();

                }

                // bounding sphere

                const boundingSphere = source.boundingSphere;

                if ( boundingSphere !== null ) {

                        this.boundingSphere = boundingSphere.clone();

                }

                // update flags

                this.elementsNeedUpdate = source.elementsNeedUpdate;
                this.verticesNeedUpdate = source.verticesNeedUpdate;
                this.uvsNeedUpdate = source.uvsNeedUpdate;
                this.normalsNeedUpdate = source.normalsNeedUpdate;
                this.colorsNeedUpdate = source.colorsNeedUpdate;
                this.lineDistancesNeedUpdate = source.lineDistancesNeedUpdate;
                this.groupsNeedUpdate = source.groupsNeedUpdate;

                return this;

        },

        dispose: function () {

                this.dispatchEvent( { type: 'dispose' } );

        }

} );

class BoxGeometry extends Geometry {

        constructor( width, height, depth, widthSegments, heightSegments, depthSegments ) {

                super();

                this.type = 'BoxGeometry';

                this.parameters = {
                        width: width,
                        height: height,
                        depth: depth,
                        widthSegments: widthSegments,
                        heightSegments: heightSegments,
                        depthSegments: depthSegments
                };

                this.fromBufferGeometry( new BoxBufferGeometry( width, height, depth, widthSegments, heightSegments, depthSegments ) );
                this.mergeVertices();

        }

}

class CircleBufferGeometry extends BufferGeometry {

        constructor( radius = 1, segments = 8, thetaStart = 0, thetaLength = Math.PI * 2 ) {

                super();

                this.type = 'CircleBufferGeometry';

                this.parameters = {
                        radius: radius,
                        segments: segments,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

                segments = Math.max( 3, segments );

                // buffers

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                // helper variables

                const vertex = new Vector3();
                const uv = new Vector2();

                // center point

                vertices.push( 0, 0, 0 );
                normals.push( 0, 0, 1 );
                uvs.push( 0.5, 0.5 );

                for ( let s = 0, i = 3; s <= segments; s ++, i += 3 ) {

                        const segment = thetaStart + s / segments * thetaLength;

                        // vertex

                        vertex.x = radius * Math.cos( segment );
                        vertex.y = radius * Math.sin( segment );

                        vertices.push( vertex.x, vertex.y, vertex.z );

                        // normal

                        normals.push( 0, 0, 1 );

                        // uvs

                        uv.x = ( vertices[ i ] / radius + 1 ) / 2;
                        uv.y = ( vertices[ i + 1 ] / radius + 1 ) / 2;

                        uvs.push( uv.x, uv.y );

                }

                // indices

                for ( let i = 1; i <= segments; i ++ ) {

                        indices.push( i, i + 1, 0 );

                }

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

        }

}

class CircleGeometry extends Geometry {

        constructor( radius, segments, thetaStart, thetaLength ) {

                super();
                this.type = 'CircleGeometry';

                this.parameters = {
                        radius: radius,
                        segments: segments,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

                this.fromBufferGeometry( new CircleBufferGeometry( radius, segments, thetaStart, thetaLength ) );
                this.mergeVertices();

        }

}

class CylinderBufferGeometry extends BufferGeometry {

        constructor( radiusTop = 1, radiusBottom = 1, height = 1, radialSegments = 8, heightSegments = 1, openEnded = false, thetaStart = 0, thetaLength = Math.PI * 2 ) {

                super();
                this.type = 'CylinderBufferGeometry';

                this.parameters = {
                        radiusTop: radiusTop,
                        radiusBottom: radiusBottom,
                        height: height,
                        radialSegments: radialSegments,
                        heightSegments: heightSegments,
                        openEnded: openEnded,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

                const scope = this;

                radialSegments = Math.floor( radialSegments );
                heightSegments = Math.floor( heightSegments );

                // buffers

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                // helper variables

                let index = 0;
                const indexArray = [];
                const halfHeight = height / 2;
                let groupStart = 0;

                // generate geometry

                generateTorso();

                if ( openEnded === false ) {

                        if ( radiusTop > 0 ) generateCap( true );
                        if ( radiusBottom > 0 ) generateCap( false );

                }

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

                function generateTorso() {

                        const normal = new Vector3();
                        const vertex = new Vector3();

                        let groupCount = 0;

                        // this will be used to calculate the normal
                        const slope = ( radiusBottom - radiusTop ) / height;

                        // generate vertices, normals and uvs

                        for ( let y = 0; y <= heightSegments; y ++ ) {

                                const indexRow = [];

                                const v = y / heightSegments;

                                // calculate the radius of the current row

                                const radius = v * ( radiusBottom - radiusTop ) + radiusTop;

                                for ( let x = 0; x <= radialSegments; x ++ ) {

                                        const u = x / radialSegments;

                                        const theta = u * thetaLength + thetaStart;

                                        const sinTheta = Math.sin( theta );
                                        const cosTheta = Math.cos( theta );

                                        // vertex

                                        vertex.x = radius * sinTheta;
                                        vertex.y = - v * height + halfHeight;
                                        vertex.z = radius * cosTheta;
                                        vertices.push( vertex.x, vertex.y, vertex.z );

                                        // normal

                                        normal.set( sinTheta, slope, cosTheta ).normalize();
                                        normals.push( normal.x, normal.y, normal.z );

                                        // uv

                                        uvs.push( u, 1 - v );

                                        // save index of vertex in respective row

                                        indexRow.push( index ++ );

                                }

                                // now save vertices of the row in our index array

                                indexArray.push( indexRow );

                        }

                        // generate indices

                        for ( let x = 0; x < radialSegments; x ++ ) {

                                for ( let y = 0; y < heightSegments; y ++ ) {

                                        // we use the index array to access the correct indices

                                        const a = indexArray[ y ][ x ];
                                        const b = indexArray[ y + 1 ][ x ];
                                        const c = indexArray[ y + 1 ][ x + 1 ];
                                        const d = indexArray[ y ][ x + 1 ];

                                        // faces

                                        indices.push( a, b, d );
                                        indices.push( b, c, d );

                                        // update group counter

                                        groupCount += 6;

                                }

                        }

                        // add a group to the geometry. this will ensure multi material support

                        scope.addGroup( groupStart, groupCount, 0 );

                        // calculate new start value for groups

                        groupStart += groupCount;

                }

                function generateCap( top ) {

                        // save the index of the first center vertex
                        const centerIndexStart = index;

                        const uv = new Vector2();
                        const vertex = new Vector3();

                        let groupCount = 0;

                        const radius = ( top === true ) ? radiusTop : radiusBottom;
                        const sign = ( top === true ) ? 1 : - 1;

                        // first we generate the center vertex data of the cap.
                        // because the geometry needs one set of uvs per face,
                        // we must generate a center vertex per face/segment

                        for ( let x = 1; x <= radialSegments; x ++ ) {

                                // vertex

                                vertices.push( 0, halfHeight * sign, 0 );

                                // normal

                                normals.push( 0, sign, 0 );

                                // uv

                                uvs.push( 0.5, 0.5 );

                                // increase index

                                index ++;

                        }

                        // save the index of the last center vertex
                        const centerIndexEnd = index;

                        // now we generate the surrounding vertices, normals and uvs

                        for ( let x = 0; x <= radialSegments; x ++ ) {

                                const u = x / radialSegments;
                                const theta = u * thetaLength + thetaStart;

                                const cosTheta = Math.cos( theta );
                                const sinTheta = Math.sin( theta );

                                // vertex

                                vertex.x = radius * sinTheta;
                                vertex.y = halfHeight * sign;
                                vertex.z = radius * cosTheta;
                                vertices.push( vertex.x, vertex.y, vertex.z );

                                // normal

                                normals.push( 0, sign, 0 );

                                // uv

                                uv.x = ( cosTheta * 0.5 ) + 0.5;
                                uv.y = ( sinTheta * 0.5 * sign ) + 0.5;
                                uvs.push( uv.x, uv.y );

                                // increase index

                                index ++;

                        }

                        // generate indices

                        for ( let x = 0; x < radialSegments; x ++ ) {

                                const c = centerIndexStart + x;
                                const i = centerIndexEnd + x;

                                if ( top === true ) {

                                        // face top

                                        indices.push( i, i + 1, c );

                                } else {

                                        // face bottom

                                        indices.push( i + 1, i, c );

                                }

                                groupCount += 3;

                        }

                        // add a group to the geometry. this will ensure multi material support

                        scope.addGroup( groupStart, groupCount, top === true ? 1 : 2 );

                        // calculate new start value for groups

                        groupStart += groupCount;

                }

        }

}

class CylinderGeometry extends Geometry {

        constructor( radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength ) {

                super();
                this.type = 'CylinderGeometry';

                this.parameters = {
                        radiusTop: radiusTop,
                        radiusBottom: radiusBottom,
                        height: height,
                        radialSegments: radialSegments,
                        heightSegments: heightSegments,
                        openEnded: openEnded,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

                this.fromBufferGeometry( new CylinderBufferGeometry( radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength ) );
                this.mergeVertices();

        }

}

class ConeGeometry extends CylinderGeometry {

        constructor( radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength ) {

                super( 0, radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength );
                this.type = 'ConeGeometry';

                this.parameters = {
                        radius: radius,
                        height: height,
                        radialSegments: radialSegments,
                        heightSegments: heightSegments,
                        openEnded: openEnded,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

        }

}

class ConeBufferGeometry extends CylinderBufferGeometry {

        constructor( radius = 1, height = 1, radialSegments = 8, heightSegments = 1, openEnded = false, thetaStart = 0, thetaLength = Math.PI * 2 ) {

                super( 0, radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength );

                this.type = 'ConeBufferGeometry';

                this.parameters = {
                        radius: radius,
                        height: height,
                        radialSegments: radialSegments,
                        heightSegments: heightSegments,
                        openEnded: openEnded,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

        }

}

class PolyhedronBufferGeometry extends BufferGeometry {

        constructor( vertices, indices, radius = 1, detail = 0 ) {

                super();

                this.type = 'PolyhedronBufferGeometry';

                this.parameters = {
                        vertices: vertices,
                        indices: indices,
                        radius: radius,
                        detail: detail
                };

                // default buffer data

                const vertexBuffer = [];
                const uvBuffer = [];

                // the subdivision creates the vertex buffer data

                subdivide( detail );

                // all vertices should lie on a conceptual sphere with a given radius

                applyRadius( radius );

                // finally, create the uv data

                generateUVs();

                // build non-indexed geometry

                this.setAttribute( 'position', new Float32BufferAttribute( vertexBuffer, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( vertexBuffer.slice(), 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvBuffer, 2 ) );

                if ( detail === 0 ) {

                        this.computeVertexNormals(); // flat normals

                } else {

                        this.normalizeNormals(); // smooth normals

                }

                // helper functions

                function subdivide( detail ) {

                        const a = new Vector3();
                        const b = new Vector3();
                        const c = new Vector3();

                        // iterate over all faces and apply a subdivison with the given detail value

                        for ( let i = 0; i < indices.length; i += 3 ) {

                                // get the vertices of the face

                                getVertexByIndex( indices[ i + 0 ], a );
                                getVertexByIndex( indices[ i + 1 ], b );
                                getVertexByIndex( indices[ i + 2 ], c );

                                // perform subdivision

                                subdivideFace( a, b, c, detail );

                        }

                }

                function subdivideFace( a, b, c, detail ) {

                        const cols = detail + 1;

                        // we use this multidimensional array as a data structure for creating the subdivision

                        const v = [];

                        // construct all of the vertices for this subdivision

                        for ( let i = 0; i <= cols; i ++ ) {

                                v[ i ] = [];

                                const aj = a.clone().lerp( c, i / cols );
                                const bj = b.clone().lerp( c, i / cols );

                                const rows = cols - i;

                                for ( let j = 0; j <= rows; j ++ ) {

                                        if ( j === 0 && i === cols ) {

                                                v[ i ][ j ] = aj;

                                        } else {

                                                v[ i ][ j ] = aj.clone().lerp( bj, j / rows );

                                        }

                                }

                        }

                        // construct all of the faces

                        for ( let i = 0; i < cols; i ++ ) {

                                for ( let j = 0; j < 2 * ( cols - i ) - 1; j ++ ) {

                                        const k = Math.floor( j / 2 );

                                        if ( j % 2 === 0 ) {

                                                pushVertex( v[ i ][ k + 1 ] );
                                                pushVertex( v[ i + 1 ][ k ] );
                                                pushVertex( v[ i ][ k ] );

                                        } else {

                                                pushVertex( v[ i ][ k + 1 ] );
                                                pushVertex( v[ i + 1 ][ k + 1 ] );
                                                pushVertex( v[ i + 1 ][ k ] );

                                        }

                                }

                        }

                }

                function applyRadius( radius ) {

                        const vertex = new Vector3();

                        // iterate over the entire buffer and apply the radius to each vertex

                        for ( let i = 0; i < vertexBuffer.length; i += 3 ) {

                                vertex.x = vertexBuffer[ i + 0 ];
                                vertex.y = vertexBuffer[ i + 1 ];
                                vertex.z = vertexBuffer[ i + 2 ];

                                vertex.normalize().multiplyScalar( radius );

                                vertexBuffer[ i + 0 ] = vertex.x;
                                vertexBuffer[ i + 1 ] = vertex.y;
                                vertexBuffer[ i + 2 ] = vertex.z;

                        }

                }

                function generateUVs() {

                        const vertex = new Vector3();

                        for ( let i = 0; i < vertexBuffer.length; i += 3 ) {

                                vertex.x = vertexBuffer[ i + 0 ];
                                vertex.y = vertexBuffer[ i + 1 ];
                                vertex.z = vertexBuffer[ i + 2 ];

                                const u = azimuth( vertex ) / 2 / Math.PI + 0.5;
                                const v = inclination( vertex ) / Math.PI + 0.5;
                                uvBuffer.push( u, 1 - v );

                        }

                        correctUVs();

                        correctSeam();

                }

                function correctSeam() {

                        // handle case when face straddles the seam, see #3269

                        for ( let i = 0; i < uvBuffer.length; i += 6 ) {

                                // uv data of a single face

                                const x0 = uvBuffer[ i + 0 ];
                                const x1 = uvBuffer[ i + 2 ];
                                const x2 = uvBuffer[ i + 4 ];

                                const max = Math.max( x0, x1, x2 );
                                const min = Math.min( x0, x1, x2 );

                                // 0.9 is somewhat arbitrary

                                if ( max > 0.9 && min < 0.1 ) {

                                        if ( x0 < 0.2 ) uvBuffer[ i + 0 ] += 1;
                                        if ( x1 < 0.2 ) uvBuffer[ i + 2 ] += 1;
                                        if ( x2 < 0.2 ) uvBuffer[ i + 4 ] += 1;

                                }

                        }

                }

                function pushVertex( vertex ) {

                        vertexBuffer.push( vertex.x, vertex.y, vertex.z );

                }

                function getVertexByIndex( index, vertex ) {

                        const stride = index * 3;

                        vertex.x = vertices[ stride + 0 ];
                        vertex.y = vertices[ stride + 1 ];
                        vertex.z = vertices[ stride + 2 ];

                }

                function correctUVs() {

                        const a = new Vector3();
                        const b = new Vector3();
                        const c = new Vector3();

                        const centroid = new Vector3();

                        const uvA = new Vector2();
                        const uvB = new Vector2();
                        const uvC = new Vector2();

                        for ( let i = 0, j = 0; i < vertexBuffer.length; i += 9, j += 6 ) {

                                a.set( vertexBuffer[ i + 0 ], vertexBuffer[ i + 1 ], vertexBuffer[ i + 2 ] );
                                b.set( vertexBuffer[ i + 3 ], vertexBuffer[ i + 4 ], vertexBuffer[ i + 5 ] );
                                c.set( vertexBuffer[ i + 6 ], vertexBuffer[ i + 7 ], vertexBuffer[ i + 8 ] );

                                uvA.set( uvBuffer[ j + 0 ], uvBuffer[ j + 1 ] );
                                uvB.set( uvBuffer[ j + 2 ], uvBuffer[ j + 3 ] );
                                uvC.set( uvBuffer[ j + 4 ], uvBuffer[ j + 5 ] );

                                centroid.copy( a ).add( b ).add( c ).divideScalar( 3 );

                                const azi = azimuth( centroid );

                                correctUV( uvA, j + 0, a, azi );
                                correctUV( uvB, j + 2, b, azi );
                                correctUV( uvC, j + 4, c, azi );

                        }

                }

                function correctUV( uv, stride, vector, azimuth ) {

                        if ( ( azimuth < 0 ) && ( uv.x === 1 ) ) {

                                uvBuffer[ stride ] = uv.x - 1;

                        }

                        if ( ( vector.x === 0 ) && ( vector.z === 0 ) ) {

                                uvBuffer[ stride ] = azimuth / 2 / Math.PI + 0.5;

                        }

                }

                // Angle around the Y axis, counter-clockwise when looking from above.

                function azimuth( vector ) {

                        return Math.atan2( vector.z, - vector.x );

                }


                // Angle above the XZ plane.

                function inclination( vector ) {

                        return Math.atan2( - vector.y, Math.sqrt( ( vector.x * vector.x ) + ( vector.z * vector.z ) ) );

                }

        }

}

class DodecahedronBufferGeometry extends PolyhedronBufferGeometry {

        constructor( radius = 1, detail = 0 ) {

                const t = ( 1 + Math.sqrt( 5 ) ) / 2;
                const r = 1 / t;

                const vertices = [

                        // (±1, ±1, ±1)
                        - 1, - 1, - 1,  - 1, - 1, 1,
                        - 1, 1, - 1, - 1, 1, 1,
                        1, - 1, - 1, 1, - 1, 1,
                        1, 1, - 1, 1, 1, 1,

                        // (0, ±1/φ, ±φ)
                        0, - r, - t, 0, - r, t,
                        0, r, - t, 0, r, t,

                        // (±1/φ, ±φ, 0)
                        - r, - t, 0, - r, t, 0,
                        r, - t, 0, r, t, 0,

                        // (±φ, 0, ±1/φ)
                        - t, 0, - r, t, 0, - r,
                        - t, 0, r, t, 0, r
                ];

                const indices = [
                        3, 11, 7,       3, 7, 15,       3, 15, 13,
                        7, 19, 17,      7, 17, 6,       7, 6, 15,
                        17, 4, 8,       17, 8, 10,      17, 10, 6,
                        8, 0, 16,       8, 16, 2,       8, 2, 10,
                        0, 12, 1,       0, 1, 18,       0, 18, 16,
                        6, 10, 2,       6, 2, 13,       6, 13, 15,
                        2, 16, 18,      2, 18, 3,       2, 3, 13,
                        18, 1, 9,       18, 9, 11,      18, 11, 3,
                        4, 14, 12,      4, 12, 0,       4, 0, 8,
                        11, 9, 5,       11, 5, 19,      11, 19, 7,
                        19, 5, 14,      19, 14, 4,      19, 4, 17,
                        1, 12, 14,      1, 14, 5,       1, 5, 9
                ];

                super( vertices, indices, radius, detail );

                this.type = 'DodecahedronBufferGeometry';

                this.parameters = {
                        radius: radius,
                        detail: detail
                };

        }

}

class DodecahedronGeometry extends Geometry {

        constructor( radius, detail ) {

                super();
                this.type = 'DodecahedronGeometry';

                this.parameters = {
                        radius: radius,
                        detail: detail
                };

                this.fromBufferGeometry( new DodecahedronBufferGeometry( radius, detail ) );
                this.mergeVertices();

        }

}

const _v0$2 = new Vector3();
const _v1$5 = new Vector3();
const _normal$1 = new Vector3();
const _triangle = new Triangle();

class EdgesGeometry extends BufferGeometry {

        constructor( geometry, thresholdAngle ) {

                super();

                this.type = 'EdgesGeometry';

                this.parameters = {
                        thresholdAngle: thresholdAngle
                };

                thresholdAngle = ( thresholdAngle !== undefined ) ? thresholdAngle : 1;

                if ( geometry.isGeometry ) {

                        geometry = new BufferGeometry().fromGeometry( geometry );

                }

                const precisionPoints = 4;
                const precision = Math.pow( 10, precisionPoints );
                const thresholdDot = Math.cos( MathUtils.DEG2RAD * thresholdAngle );

                const indexAttr = geometry.getIndex();
                const positionAttr = geometry.getAttribute( 'position' );
                const indexCount = indexAttr ? indexAttr.count : positionAttr.count;

                const indexArr = [ 0, 0, 0 ];
                const vertKeys = [ 'a', 'b', 'c' ];
                const hashes = new Array( 3 );

                const edgeData = {};
                const vertices = [];
                for ( let i = 0; i < indexCount; i += 3 ) {

                        if ( indexAttr ) {

                                indexArr[ 0 ] = indexAttr.getX( i );
                                indexArr[ 1 ] = indexAttr.getX( i + 1 );
                                indexArr[ 2 ] = indexAttr.getX( i + 2 );

                        } else {

                                indexArr[ 0 ] = i;
                                indexArr[ 1 ] = i + 1;
                                indexArr[ 2 ] = i + 2;

                        }

                        const { a, b, c } = _triangle;
                        a.fromBufferAttribute( positionAttr, indexArr[ 0 ] );
                        b.fromBufferAttribute( positionAttr, indexArr[ 1 ] );
                        c.fromBufferAttribute( positionAttr, indexArr[ 2 ] );
                        _triangle.getNormal( _normal$1 );

                        // create hashes for the edge from the vertices
                        hashes[ 0 ] = `${ Math.round( a.x * precision ) },${ Math.round( a.y * precision ) },${ Math.round( a.z * precision ) }`;
                        hashes[ 1 ] = `${ Math.round( b.x * precision ) },${ Math.round( b.y * precision ) },${ Math.round( b.z * precision ) }`;
                        hashes[ 2 ] = `${ Math.round( c.x * precision ) },${ Math.round( c.y * precision ) },${ Math.round( c.z * precision ) }`;

                        // skip degenerate triangles
                        if ( hashes[ 0 ] === hashes[ 1 ] || hashes[ 1 ] === hashes[ 2 ] || hashes[ 2 ] === hashes[ 0 ] ) {

                                continue;

                        }

                        // iterate over every edge
                        for ( let j = 0; j < 3; j ++ ) {

                                // get the first and next vertex making up the edge
                                const jNext = ( j + 1 ) % 3;
                                const vecHash0 = hashes[ j ];
                                const vecHash1 = hashes[ jNext ];
                                const v0 = _triangle[ vertKeys[ j ] ];
                                const v1 = _triangle[ vertKeys[ jNext ] ];

                                const hash = `${ vecHash0 }_${ vecHash1 }`;
                                const reverseHash = `${ vecHash1 }_${ vecHash0 }`;

                                if ( reverseHash in edgeData && edgeData[ reverseHash ] ) {

                                        // if we found a sibling edge add it into the vertex array if
                                        // it meets the angle threshold and delete the edge from the map.
                                        if ( _normal$1.dot( edgeData[ reverseHash ].normal ) <= thresholdDot ) {

                                                vertices.push( v0.x, v0.y, v0.z );
                                                vertices.push( v1.x, v1.y, v1.z );

                                        }

                                        edgeData[ reverseHash ] = null;

                                } else if ( ! ( hash in edgeData ) ) {

                                        // if we've already got an edge here then skip adding a new one
                                        edgeData[ hash ] = {

                                                index0: indexArr[ j ],
                                                index1: indexArr[ jNext ],
                                                normal: _normal$1.clone(),

                                        };

                                }

                        }

                }

                // iterate over all remaining, unmatched edges and add them to the vertex array
                for ( const key in edgeData ) {

                        if ( edgeData[ key ] ) {

                                const { index0, index1 } = edgeData[ key ];
                                _v0$2.fromBufferAttribute( positionAttr, index0 );
                                _v1$5.fromBufferAttribute( positionAttr, index1 );

                                vertices.push( _v0$2.x, _v0$2.y, _v0$2.z );
                                vertices.push( _v1$5.x, _v1$5.y, _v1$5.z );

                        }

                }

                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

        }

}

/**
 * Port from https://github.com/mapbox/earcut (v2.2.2)
 */

const Earcut = {

        triangulate: function ( data, holeIndices, dim ) {

                dim = dim || 2;

                const hasHoles = holeIndices && holeIndices.length;
                const outerLen = hasHoles ? holeIndices[ 0 ] * dim : data.length;
                let outerNode = linkedList( data, 0, outerLen, dim, true );
                const triangles = [];

                if ( ! outerNode || outerNode.next === outerNode.prev ) return triangles;

                let minX, minY, maxX, maxY, x, y, invSize;

                if ( hasHoles ) outerNode = eliminateHoles( data, holeIndices, outerNode, dim );

                // if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox
                if ( data.length > 80 * dim ) {

                        minX = maxX = data[ 0 ];
                        minY = maxY = data[ 1 ];

                        for ( let i = dim; i < outerLen; i += dim ) {

                                x = data[ i ];
                                y = data[ i + 1 ];
                                if ( x < minX ) minX = x;
                                if ( y < minY ) minY = y;
                                if ( x > maxX ) maxX = x;
                                if ( y > maxY ) maxY = y;

                        }

                        // minX, minY and invSize are later used to transform coords into integers for z-order calculation
                        invSize = Math.max( maxX - minX, maxY - minY );
                        invSize = invSize !== 0 ? 1 / invSize : 0;

                }

                earcutLinked( outerNode, triangles, dim, minX, minY, invSize );

                return triangles;

        }

};

// create a circular doubly linked list from polygon points in the specified winding order
function linkedList( data, start, end, dim, clockwise ) {

        let i, last;

        if ( clockwise === ( signedArea( data, start, end, dim ) > 0 ) ) {

                for ( i = start; i < end; i += dim ) last = insertNode( i, data[ i ], data[ i + 1 ], last );

        } else {

                for ( i = end - dim; i >= start; i -= dim ) last = insertNode( i, data[ i ], data[ i + 1 ], last );

        }

        if ( last && equals( last, last.next ) ) {

                removeNode( last );
                last = last.next;

        }

        return last;

}

// eliminate colinear or duplicate points
function filterPoints( start, end ) {

        if ( ! start ) return start;
        if ( ! end ) end = start;

        let p = start,
                again;
        do {

                again = false;

                if ( ! p.steiner && ( equals( p, p.next ) || area( p.prev, p, p.next ) === 0 ) ) {

                        removeNode( p );
                        p = end = p.prev;
                        if ( p === p.next ) break;
                        again = true;

                } else {

                        p = p.next;

                }

        } while ( again || p !== end );

        return end;

}

// main ear slicing loop which triangulates a polygon (given as a linked list)
function earcutLinked( ear, triangles, dim, minX, minY, invSize, pass ) {

        if ( ! ear ) return;

        // interlink polygon nodes in z-order
        if ( ! pass && invSize ) indexCurve( ear, minX, minY, invSize );

        let stop = ear,
                prev, next;

        // iterate through ears, slicing them one by one
        while ( ear.prev !== ear.next ) {

                prev = ear.prev;
                next = ear.next;

                if ( invSize ? isEarHashed( ear, minX, minY, invSize ) : isEar( ear ) ) {

                        // cut off the triangle
                        triangles.push( prev.i / dim );
                        triangles.push( ear.i / dim );
                        triangles.push( next.i / dim );

                        removeNode( ear );

                        // skipping the next vertex leads to less sliver triangles
                        ear = next.next;
                        stop = next.next;

                        continue;

                }

                ear = next;

                // if we looped through the whole remaining polygon and can't find any more ears
                if ( ear === stop ) {

                        // try filtering points and slicing again
                        if ( ! pass ) {

                                earcutLinked( filterPoints( ear ), triangles, dim, minX, minY, invSize, 1 );

                                // if this didn't work, try curing all small self-intersections locally

                        } else if ( pass === 1 ) {

                                ear = cureLocalIntersections( filterPoints( ear ), triangles, dim );
                                earcutLinked( ear, triangles, dim, minX, minY, invSize, 2 );

                                // as a last resort, try splitting the remaining polygon into two

                        } else if ( pass === 2 ) {

                                splitEarcut( ear, triangles, dim, minX, minY, invSize );

                        }

                        break;

                }

        }

}

// check whether a polygon node forms a valid ear with adjacent nodes
function isEar( ear ) {

        const a = ear.prev,
                b = ear,
                c = ear.next;

        if ( area( a, b, c ) >= 0 ) return false; // reflex, can't be an ear

        // now make sure we don't have other points inside the potential ear
        let p = ear.next.next;

        while ( p !== ear.prev ) {

                if ( pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y ) &&
                        area( p.prev, p, p.next ) >= 0 ) return false;
                p = p.next;

        }

        return true;

}

function isEarHashed( ear, minX, minY, invSize ) {

        const a = ear.prev,
                b = ear,
                c = ear.next;

        if ( area( a, b, c ) >= 0 ) return false; // reflex, can't be an ear

        // triangle bbox; min & max are calculated like this for speed
        const minTX = a.x < b.x ? ( a.x < c.x ? a.x : c.x ) : ( b.x < c.x ? b.x : c.x ),
                minTY = a.y < b.y ? ( a.y < c.y ? a.y : c.y ) : ( b.y < c.y ? b.y : c.y ),
                maxTX = a.x > b.x ? ( a.x > c.x ? a.x : c.x ) : ( b.x > c.x ? b.x : c.x ),
                maxTY = a.y > b.y ? ( a.y > c.y ? a.y : c.y ) : ( b.y > c.y ? b.y : c.y );

        // z-order range for the current triangle bbox;
        const minZ = zOrder( minTX, minTY, minX, minY, invSize ),
                maxZ = zOrder( maxTX, maxTY, minX, minY, invSize );

        let p = ear.prevZ,
                n = ear.nextZ;

        // look for points inside the triangle in both directions
        while ( p && p.z >= minZ && n && n.z <= maxZ ) {

                if ( p !== ear.prev && p !== ear.next &&
                        pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y ) &&
                        area( p.prev, p, p.next ) >= 0 ) return false;
                p = p.prevZ;

                if ( n !== ear.prev && n !== ear.next &&
                        pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, n.x, n.y ) &&
                        area( n.prev, n, n.next ) >= 0 ) return false;
                n = n.nextZ;

        }

        // look for remaining points in decreasing z-order
        while ( p && p.z >= minZ ) {

                if ( p !== ear.prev && p !== ear.next &&
                        pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y ) &&
                        area( p.prev, p, p.next ) >= 0 ) return false;
                p = p.prevZ;

        }

        // look for remaining points in increasing z-order
        while ( n && n.z <= maxZ ) {

                if ( n !== ear.prev && n !== ear.next &&
                        pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, n.x, n.y ) &&
                        area( n.prev, n, n.next ) >= 0 ) return false;
                n = n.nextZ;

        }

        return true;

}

// go through all polygon nodes and cure small local self-intersections
function cureLocalIntersections( start, triangles, dim ) {

        let p = start;
        do {

                const a = p.prev,
                        b = p.next.next;

                if ( ! equals( a, b ) && intersects( a, p, p.next, b ) && locallyInside( a, b ) && locallyInside( b, a ) ) {

                        triangles.push( a.i / dim );
                        triangles.push( p.i / dim );
                        triangles.push( b.i / dim );

                        // remove two nodes involved
                        removeNode( p );
                        removeNode( p.next );

                        p = start = b;

                }

                p = p.next;

        } while ( p !== start );

        return filterPoints( p );

}

// try splitting polygon into two and triangulate them independently
function splitEarcut( start, triangles, dim, minX, minY, invSize ) {

        // look for a valid diagonal that divides the polygon into two
        let a = start;
        do {

                let b = a.next.next;
                while ( b !== a.prev ) {

                        if ( a.i !== b.i && isValidDiagonal( a, b ) ) {

                                // split the polygon in two by the diagonal
                                let c = splitPolygon( a, b );

                                // filter colinear points around the cuts
                                a = filterPoints( a, a.next );
                                c = filterPoints( c, c.next );

                                // run earcut on each half
                                earcutLinked( a, triangles, dim, minX, minY, invSize );
                                earcutLinked( c, triangles, dim, minX, minY, invSize );
                                return;

                        }

                        b = b.next;

                }

                a = a.next;

        } while ( a !== start );

}

// link every hole into the outer loop, producing a single-ring polygon without holes
function eliminateHoles( data, holeIndices, outerNode, dim ) {

        const queue = [];
        let i, len, start, end, list;

        for ( i = 0, len = holeIndices.length; i < len; i ++ ) {

                start = holeIndices[ i ] * dim;
                end = i < len - 1 ? holeIndices[ i + 1 ] * dim : data.length;
                list = linkedList( data, start, end, dim, false );
                if ( list === list.next ) list.steiner = true;
                queue.push( getLeftmost( list ) );

        }

        queue.sort( compareX );

        // process holes from left to right
        for ( i = 0; i < queue.length; i ++ ) {

                eliminateHole( queue[ i ], outerNode );
                outerNode = filterPoints( outerNode, outerNode.next );

        }

        return outerNode;

}

function compareX( a, b ) {

        return a.x - b.x;

}

// find a bridge between vertices that connects hole with an outer ring and and link it
function eliminateHole( hole, outerNode ) {

        outerNode = findHoleBridge( hole, outerNode );
        if ( outerNode ) {

                const b = splitPolygon( outerNode, hole );

                // filter collinear points around the cuts
                filterPoints( outerNode, outerNode.next );
                filterPoints( b, b.next );

        }

}

// David Eberly's algorithm for finding a bridge between hole and outer polygon
function findHoleBridge( hole, outerNode ) {

        let p = outerNode;
        const hx = hole.x;
        const hy = hole.y;
        let qx = - Infinity, m;

        // find a segment intersected by a ray from the hole's leftmost point to the left;
        // segment's endpoint with lesser x will be potential connection point
        do {

                if ( hy <= p.y && hy >= p.next.y && p.next.y !== p.y ) {

                        const x = p.x + ( hy - p.y ) * ( p.next.x - p.x ) / ( p.next.y - p.y );
                        if ( x <= hx && x > qx ) {

                                qx = x;
                                if ( x === hx ) {

                                        if ( hy === p.y ) return p;
                                        if ( hy === p.next.y ) return p.next;

                                }

                                m = p.x < p.next.x ? p : p.next;

                        }

                }

                p = p.next;

        } while ( p !== outerNode );

        if ( ! m ) return null;

        if ( hx === qx ) return m; // hole touches outer segment; pick leftmost endpoint

        // look for points inside the triangle of hole point, segment intersection and endpoint;
        // if there are no points found, we have a valid connection;
        // otherwise choose the point of the minimum angle with the ray as connection point

        const stop = m,
                mx = m.x,
                my = m.y;
        let tanMin = Infinity, tan;

        p = m;

        do {

                if ( hx >= p.x && p.x >= mx && hx !== p.x &&
                                pointInTriangle( hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y ) ) {

                        tan = Math.abs( hy - p.y ) / ( hx - p.x ); // tangential

                        if ( locallyInside( p, hole ) && ( tan < tanMin || ( tan === tanMin && ( p.x > m.x || ( p.x === m.x && sectorContainsSector( m, p ) ) ) ) ) ) {

                                m = p;
                                tanMin = tan;

                        }

                }

                p = p.next;

        } while ( p !== stop );

        return m;

}

// whether sector in vertex m contains sector in vertex p in the same coordinates
function sectorContainsSector( m, p ) {

        return area( m.prev, m, p.prev ) < 0 && area( p.next, m, m.next ) < 0;

}

// interlink polygon nodes in z-order
function indexCurve( start, minX, minY, invSize ) {

        let p = start;
        do {

                if ( p.z === null ) p.z = zOrder( p.x, p.y, minX, minY, invSize );
                p.prevZ = p.prev;
                p.nextZ = p.next;
                p = p.next;

        } while ( p !== start );

        p.prevZ.nextZ = null;
        p.prevZ = null;

        sortLinked( p );

}

// Simon Tatham's linked list merge sort algorithm
// http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html
function sortLinked( list ) {

        let i, p, q, e, tail, numMerges, pSize, qSize,
                inSize = 1;

        do {

                p = list;
                list = null;
                tail = null;
                numMerges = 0;

                while ( p ) {

                        numMerges ++;
                        q = p;
                        pSize = 0;
                        for ( i = 0; i < inSize; i ++ ) {

                                pSize ++;
                                q = q.nextZ;
                                if ( ! q ) break;

                        }

                        qSize = inSize;

                        while ( pSize > 0 || ( qSize > 0 && q ) ) {

                                if ( pSize !== 0 && ( qSize === 0 || ! q || p.z <= q.z ) ) {

                                        e = p;
                                        p = p.nextZ;
                                        pSize --;

                                } else {

                                        e = q;
                                        q = q.nextZ;
                                        qSize --;

                                }

                                if ( tail ) tail.nextZ = e;
                                else list = e;

                                e.prevZ = tail;
                                tail = e;

                        }

                        p = q;

                }

                tail.nextZ = null;
                inSize *= 2;

        } while ( numMerges > 1 );

        return list;

}

// z-order of a point given coords and inverse of the longer side of data bbox
function zOrder( x, y, minX, minY, invSize ) {

        // coords are transformed into non-negative 15-bit integer range
        x = 32767 * ( x - minX ) * invSize;
        y = 32767 * ( y - minY ) * invSize;

        x = ( x | ( x << 8 ) ) & 0x00FF00FF;
        x = ( x | ( x << 4 ) ) & 0x0F0F0F0F;
        x = ( x | ( x << 2 ) ) & 0x33333333;
        x = ( x | ( x << 1 ) ) & 0x55555555;

        y = ( y | ( y << 8 ) ) & 0x00FF00FF;
        y = ( y | ( y << 4 ) ) & 0x0F0F0F0F;
        y = ( y | ( y << 2 ) ) & 0x33333333;
        y = ( y | ( y << 1 ) ) & 0x55555555;

        return x | ( y << 1 );

}

// find the leftmost node of a polygon ring
function getLeftmost( start ) {

        let p = start,
                leftmost = start;
        do {

                if ( p.x < leftmost.x || ( p.x === leftmost.x && p.y < leftmost.y ) ) leftmost = p;
                p = p.next;

        } while ( p !== start );

        return leftmost;

}

// check if a point lies within a convex triangle
function pointInTriangle( ax, ay, bx, by, cx, cy, px, py ) {

        return ( cx - px ) * ( ay - py ) - ( ax - px ) * ( cy - py ) >= 0 &&
                        ( ax - px ) * ( by - py ) - ( bx - px ) * ( ay - py ) >= 0 &&
                        ( bx - px ) * ( cy - py ) - ( cx - px ) * ( by - py ) >= 0;

}

// check if a diagonal between two polygon nodes is valid (lies in polygon interior)
function isValidDiagonal( a, b ) {

        return a.next.i !== b.i && a.prev.i !== b.i && ! intersectsPolygon( a, b ) && // dones't intersect other edges
                ( locallyInside( a, b ) && locallyInside( b, a ) && middleInside( a, b ) && // locally visible
                ( area( a.prev, a, b.prev ) || area( a, b.prev, b ) ) || // does not create opposite-facing sectors
                equals( a, b ) && area( a.prev, a, a.next ) > 0 && area( b.prev, b, b.next ) > 0 ); // special zero-length case

}

// signed area of a triangle
function area( p, q, r ) {

        return ( q.y - p.y ) * ( r.x - q.x ) - ( q.x - p.x ) * ( r.y - q.y );

}

// check if two points are equal
function equals( p1, p2 ) {

        return p1.x === p2.x && p1.y === p2.y;

}

// check if two segments intersect
function intersects( p1, q1, p2, q2 ) {

        const o1 = sign( area( p1, q1, p2 ) );
        const o2 = sign( area( p1, q1, q2 ) );
        const o3 = sign( area( p2, q2, p1 ) );
        const o4 = sign( area( p2, q2, q1 ) );

        if ( o1 !== o2 && o3 !== o4 ) return true; // general case

        if ( o1 === 0 && onSegment( p1, p2, q1 ) ) return true; // p1, q1 and p2 are collinear and p2 lies on p1q1
        if ( o2 === 0 && onSegment( p1, q2, q1 ) ) return true; // p1, q1 and q2 are collinear and q2 lies on p1q1
        if ( o3 === 0 && onSegment( p2, p1, q2 ) ) return true; // p2, q2 and p1 are collinear and p1 lies on p2q2
        if ( o4 === 0 && onSegment( p2, q1, q2 ) ) return true; // p2, q2 and q1 are collinear and q1 lies on p2q2

        return false;

}

// for collinear points p, q, r, check if point q lies on segment pr
function onSegment( p, q, r ) {

        return q.x <= Math.max( p.x, r.x ) && q.x >= Math.min( p.x, r.x ) && q.y <= Math.max( p.y, r.y ) && q.y >= Math.min( p.y, r.y );

}

function sign( num ) {

        return num > 0 ? 1 : num < 0 ? - 1 : 0;

}

// check if a polygon diagonal intersects any polygon segments
function intersectsPolygon( a, b ) {

        let p = a;
        do {

                if ( p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&
                                intersects( p, p.next, a, b ) ) return true;
                p = p.next;

        } while ( p !== a );

        return false;

}

// check if a polygon diagonal is locally inside the polygon
function locallyInside( a, b ) {

        return area( a.prev, a, a.next ) < 0 ?
                area( a, b, a.next ) >= 0 && area( a, a.prev, b ) >= 0 :
                area( a, b, a.prev ) < 0 || area( a, a.next, b ) < 0;

}

// check if the middle point of a polygon diagonal is inside the polygon
function middleInside( a, b ) {

        let p = a,
                inside = false;
        const px = ( a.x + b.x ) / 2,
                py = ( a.y + b.y ) / 2;
        do {

                if ( ( ( p.y > py ) !== ( p.next.y > py ) ) && p.next.y !== p.y &&
                                ( px < ( p.next.x - p.x ) * ( py - p.y ) / ( p.next.y - p.y ) + p.x ) )
                        inside = ! inside;
                p = p.next;

        } while ( p !== a );

        return inside;

}

// link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;
// if one belongs to the outer ring and another to a hole, it merges it into a single ring
function splitPolygon( a, b ) {

        const a2 = new Node( a.i, a.x, a.y ),
                b2 = new Node( b.i, b.x, b.y ),
                an = a.next,
                bp = b.prev;

        a.next = b;
        b.prev = a;

        a2.next = an;
        an.prev = a2;

        b2.next = a2;
        a2.prev = b2;

        bp.next = b2;
        b2.prev = bp;

        return b2;

}

// create a node and optionally link it with previous one (in a circular doubly linked list)
function insertNode( i, x, y, last ) {

        const p = new Node( i, x, y );

        if ( ! last ) {

                p.prev = p;
                p.next = p;

        } else {

                p.next = last.next;
                p.prev = last;
                last.next.prev = p;
                last.next = p;

        }

        return p;

}

function removeNode( p ) {

        p.next.prev = p.prev;
        p.prev.next = p.next;

        if ( p.prevZ ) p.prevZ.nextZ = p.nextZ;
        if ( p.nextZ ) p.nextZ.prevZ = p.prevZ;

}

function Node( i, x, y ) {

        // vertex index in coordinates array
        this.i = i;

        // vertex coordinates
        this.x = x;
        this.y = y;

        // previous and next vertex nodes in a polygon ring
        this.prev = null;
        this.next = null;

        // z-order curve value
        this.z = null;

        // previous and next nodes in z-order
        this.prevZ = null;
        this.nextZ = null;

        // indicates whether this is a steiner point
        this.steiner = false;

}

function signedArea( data, start, end, dim ) {

        let sum = 0;
        for ( let i = start, j = end - dim; i < end; i += dim ) {

                sum += ( data[ j ] - data[ i ] ) * ( data[ i + 1 ] + data[ j + 1 ] );
                j = i;

        }

        return sum;

}

const ShapeUtils = {

        // calculate area of the contour polygon

        area: function ( contour ) {

                const n = contour.length;
                let a = 0.0;

                for ( let p = n - 1, q = 0; q < n; p = q ++ ) {

                        a += contour[ p ].x * contour[ q ].y - contour[ q ].x * contour[ p ].y;

                }

                return a * 0.5;

        },

        isClockWise: function ( pts ) {

                return ShapeUtils.area( pts ) < 0;

        },

        triangulateShape: function ( contour, holes ) {

                const vertices = []; // flat array of vertices like [ x0,y0, x1,y1, x2,y2, ... ]
                const holeIndices = []; // array of hole indices
                const faces = []; // final array of vertex indices like [ [ a,b,d ], [ b,c,d ] ]

                removeDupEndPts( contour );
                addContour( vertices, contour );

                //

                let holeIndex = contour.length;

                holes.forEach( removeDupEndPts );

                for ( let i = 0; i < holes.length; i ++ ) {

                        holeIndices.push( holeIndex );
                        holeIndex += holes[ i ].length;
                        addContour( vertices, holes[ i ] );

                }

                //

                const triangles = Earcut.triangulate( vertices, holeIndices );

                //

                for ( let i = 0; i < triangles.length; i += 3 ) {

                        faces.push( triangles.slice( i, i + 3 ) );

                }

                return faces;

        }

};

function removeDupEndPts( points ) {

        const l = points.length;

        if ( l > 2 && points[ l - 1 ].equals( points[ 0 ] ) ) {

                points.pop();

        }

}

function addContour( vertices, contour ) {

        for ( let i = 0; i < contour.length; i ++ ) {

                vertices.push( contour[ i ].x );
                vertices.push( contour[ i ].y );

        }

}

/**
 * Creates extruded geometry from a path shape.
 *
 * parameters = {
 *
 *  curveSegments: <int>, // number of points on the curves
 *  steps: <int>, // number of points for z-side extrusions / used for subdividing segments of extrude spline too
 *  depth: <float>, // Depth to extrude the shape
 *
 *  bevelEnabled: <bool>, // turn on bevel
 *  bevelThickness: <float>, // how deep into the original shape bevel goes
 *  bevelSize: <float>, // how far from shape outline (including bevelOffset) is bevel
 *  bevelOffset: <float>, // how far from shape outline does bevel start
 *  bevelSegments: <int>, // number of bevel layers
 *
 *  extrudePath: <THREE.Curve> // curve to extrude shape along
 *
 *  UVGenerator: <Object> // object that provides UV generator functions
 *
 * }
 */

class ExtrudeBufferGeometry extends BufferGeometry {

        constructor( shapes, options ) {

                super();

                this.type = 'ExtrudeBufferGeometry';

                this.parameters = {
                        shapes: shapes,
                        options: options
                };

                shapes = Array.isArray( shapes ) ? shapes : [ shapes ];

                const scope = this;

                const verticesArray = [];
                const uvArray = [];

                for ( let i = 0, l = shapes.length; i < l; i ++ ) {

                        const shape = shapes[ i ];
                        addShape( shape );

                }

                // build geometry

                this.setAttribute( 'position', new Float32BufferAttribute( verticesArray, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvArray, 2 ) );

                this.computeVertexNormals();

                // functions

                function addShape( shape ) {

                        const placeholder = [];

                        // options

                        const curveSegments = options.curveSegments !== undefined ? options.curveSegments : 12;
                        const steps = options.steps !== undefined ? options.steps : 1;
                        let depth = options.depth !== undefined ? options.depth : 100;

                        let bevelEnabled = options.bevelEnabled !== undefined ? options.bevelEnabled : true;
                        let bevelThickness = options.bevelThickness !== undefined ? options.bevelThickness : 6;
                        let bevelSize = options.bevelSize !== undefined ? options.bevelSize : bevelThickness - 2;
                        let bevelOffset = options.bevelOffset !== undefined ? options.bevelOffset : 0;
                        let bevelSegments = options.bevelSegments !== undefined ? options.bevelSegments : 3;

                        const extrudePath = options.extrudePath;

                        const uvgen = options.UVGenerator !== undefined ? options.UVGenerator : WorldUVGenerator;

                        // deprecated options

                        if ( options.amount !== undefined ) {

                                console.warn( 'THREE.ExtrudeBufferGeometry: amount has been renamed to depth.' );
                                depth = options.amount;

                        }

                        //

                        let extrudePts, extrudeByPath = false;
                        let splineTube, binormal, normal, position2;

                        if ( extrudePath ) {

                                extrudePts = extrudePath.getSpacedPoints( steps );

                                extrudeByPath = true;
                                bevelEnabled = false; // bevels not supported for path extrusion

                                // SETUP TNB variables

                                // TODO1 - have a .isClosed in spline?

                                splineTube = extrudePath.computeFrenetFrames( steps, false );

                                // console.log(splineTube, 'splineTube', splineTube.normals.length, 'steps', steps, 'extrudePts', extrudePts.length);

                                binormal = new Vector3();
                                normal = new Vector3();
                                position2 = new Vector3();

                        }

                        // Safeguards if bevels are not enabled

                        if ( ! bevelEnabled ) {

                                bevelSegments = 0;
                                bevelThickness = 0;
                                bevelSize = 0;
                                bevelOffset = 0;

                        }

                        // Variables initialization

                        const shapePoints = shape.extractPoints( curveSegments );

                        let vertices = shapePoints.shape;
                        const holes = shapePoints.holes;

                        const reverse = ! ShapeUtils.isClockWise( vertices );

                        if ( reverse ) {

                                vertices = vertices.reverse();

                                // Maybe we should also check if holes are in the opposite direction, just to be safe ...

                                for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

                                        const ahole = holes[ h ];

                                        if ( ShapeUtils.isClockWise( ahole ) ) {

                                                holes[ h ] = ahole.reverse();

                                        }

                                }

                        }


                        const faces = ShapeUtils.triangulateShape( vertices, holes );

                        /* Vertices */

                        const contour = vertices; // vertices has all points but contour has only points of circumference

                        for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

                                const ahole = holes[ h ];

                                vertices = vertices.concat( ahole );

                        }


                        function scalePt2( pt, vec, size ) {

                                if ( ! vec ) console.error( "THREE.ExtrudeGeometry: vec does not exist" );

                                return vec.clone().multiplyScalar( size ).add( pt );

                        }

                        const vlen = vertices.length, flen = faces.length;


                        // Find directions for point movement


                        function getBevelVec( inPt, inPrev, inNext ) {

                                // computes for inPt the corresponding point inPt' on a new contour
                                //   shifted by 1 unit (length of normalized vector) to the left
                                // if we walk along contour clockwise, this new contour is outside the old one
                                //
                                // inPt' is the intersection of the two lines parallel to the two
                                //  adjacent edges of inPt at a distance of 1 unit on the left side.

                                let v_trans_x, v_trans_y, shrink_by; // resulting translation vector for inPt

                                // good reading for geometry algorithms (here: line-line intersection)
                                // http://geomalgorithms.com/a05-_intersect-1.html

                                const v_prev_x = inPt.x - inPrev.x,
                                        v_prev_y = inPt.y - inPrev.y;
                                const v_next_x = inNext.x - inPt.x,
                                        v_next_y = inNext.y - inPt.y;

                                const v_prev_lensq = ( v_prev_x * v_prev_x + v_prev_y * v_prev_y );

                                // check for collinear edges
                                const collinear0 = ( v_prev_x * v_next_y - v_prev_y * v_next_x );

                                if ( Math.abs( collinear0 ) > Number.EPSILON ) {

                                        // not collinear

                                        // length of vectors for normalizing

                                        const v_prev_len = Math.sqrt( v_prev_lensq );
                                        const v_next_len = Math.sqrt( v_next_x * v_next_x + v_next_y * v_next_y );

                                        // shift adjacent points by unit vectors to the left

                                        const ptPrevShift_x = ( inPrev.x - v_prev_y / v_prev_len );
                                        const ptPrevShift_y = ( inPrev.y + v_prev_x / v_prev_len );

                                        const ptNextShift_x = ( inNext.x - v_next_y / v_next_len );
                                        const ptNextShift_y = ( inNext.y + v_next_x / v_next_len );

                                        // scaling factor for v_prev to intersection point

                                        const sf = ( ( ptNextShift_x - ptPrevShift_x ) * v_next_y -
                                                        ( ptNextShift_y - ptPrevShift_y ) * v_next_x ) /
                                                ( v_prev_x * v_next_y - v_prev_y * v_next_x );

                                        // vector from inPt to intersection point

                                        v_trans_x = ( ptPrevShift_x + v_prev_x * sf - inPt.x );
                                        v_trans_y = ( ptPrevShift_y + v_prev_y * sf - inPt.y );

                                        // Don't normalize!, otherwise sharp corners become ugly
                                        //  but prevent crazy spikes
                                        const v_trans_lensq = ( v_trans_x * v_trans_x + v_trans_y * v_trans_y );
                                        if ( v_trans_lensq <= 2 ) {

                                                return new Vector2( v_trans_x, v_trans_y );

                                        } else {

                                                shrink_by = Math.sqrt( v_trans_lensq / 2 );

                                        }

                                } else {

                                        // handle special case of collinear edges

                                        let direction_eq = false; // assumes: opposite

                                        if ( v_prev_x > Number.EPSILON ) {

                                                if ( v_next_x > Number.EPSILON ) {

                                                        direction_eq = true;

                                                }

                                        } else {

                                                if ( v_prev_x < - Number.EPSILON ) {

                                                        if ( v_next_x < - Number.EPSILON ) {

                                                                direction_eq = true;

                                                        }

                                                } else {

                                                        if ( Math.sign( v_prev_y ) === Math.sign( v_next_y ) ) {

                                                                direction_eq = true;

                                                        }

                                                }

                                        }

                                        if ( direction_eq ) {

                                                // console.log("Warning: lines are a straight sequence");
                                                v_trans_x = - v_prev_y;
                                                v_trans_y = v_prev_x;
                                                shrink_by = Math.sqrt( v_prev_lensq );

                                        } else {

                                                // console.log("Warning: lines are a straight spike");
                                                v_trans_x = v_prev_x;
                                                v_trans_y = v_prev_y;
                                                shrink_by = Math.sqrt( v_prev_lensq / 2 );

                                        }

                                }

                                return new Vector2( v_trans_x / shrink_by, v_trans_y / shrink_by );

                        }


                        const contourMovements = [];

                        for ( let i = 0, il = contour.length, j = il - 1, k = i + 1; i < il; i ++, j ++, k ++ ) {

                                if ( j === il ) j = 0;
                                if ( k === il ) k = 0;

                                //  (j)---(i)---(k)
                                // console.log('i,j,k', i, j , k)

                                contourMovements[ i ] = getBevelVec( contour[ i ], contour[ j ], contour[ k ] );

                        }

                        const holesMovements = [];
                        let oneHoleMovements, verticesMovements = contourMovements.concat();

                        for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

                                const ahole = holes[ h ];

                                oneHoleMovements = [];

                                for ( let i = 0, il = ahole.length, j = il - 1, k = i + 1; i < il; i ++, j ++, k ++ ) {

                                        if ( j === il ) j = 0;
                                        if ( k === il ) k = 0;

                                        //  (j)---(i)---(k)
                                        oneHoleMovements[ i ] = getBevelVec( ahole[ i ], ahole[ j ], ahole[ k ] );

                                }

                                holesMovements.push( oneHoleMovements );
                                verticesMovements = verticesMovements.concat( oneHoleMovements );

                        }


                        // Loop bevelSegments, 1 for the front, 1 for the back

                        for ( let b = 0; b < bevelSegments; b ++ ) {

                                //for ( b = bevelSegments; b > 0; b -- ) {

                                const t = b / bevelSegments;
                                const z = bevelThickness * Math.cos( t * Math.PI / 2 );
                                const bs = bevelSize * Math.sin( t * Math.PI / 2 ) + bevelOffset;

                                // contract shape

                                for ( let i = 0, il = contour.length; i < il; i ++ ) {

                                        const vert = scalePt2( contour[ i ], contourMovements[ i ], bs );

                                        v( vert.x, vert.y, - z );

                                }

                                // expand holes

                                for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

                                        const ahole = holes[ h ];
                                        oneHoleMovements = holesMovements[ h ];

                                        for ( let i = 0, il = ahole.length; i < il; i ++ ) {

                                                const vert = scalePt2( ahole[ i ], oneHoleMovements[ i ], bs );

                                                v( vert.x, vert.y, - z );

                                        }

                                }

                        }

                        const bs = bevelSize + bevelOffset;

                        // Back facing vertices

                        for ( let i = 0; i < vlen; i ++ ) {

                                const vert = bevelEnabled ? scalePt2( vertices[ i ], verticesMovements[ i ], bs ) : vertices[ i ];

                                if ( ! extrudeByPath ) {

                                        v( vert.x, vert.y, 0 );

                                } else {

                                        // v( vert.x, vert.y + extrudePts[ 0 ].y, extrudePts[ 0 ].x );

                                        normal.copy( splineTube.normals[ 0 ] ).multiplyScalar( vert.x );
                                        binormal.copy( splineTube.binormals[ 0 ] ).multiplyScalar( vert.y );

                                        position2.copy( extrudePts[ 0 ] ).add( normal ).add( binormal );

                                        v( position2.x, position2.y, position2.z );

                                }

                        }

                        // Add stepped vertices...
                        // Including front facing vertices

                        for ( let s = 1; s <= steps; s ++ ) {

                                for ( let i = 0; i < vlen; i ++ ) {

                                        const vert = bevelEnabled ? scalePt2( vertices[ i ], verticesMovements[ i ], bs ) : vertices[ i ];

                                        if ( ! extrudeByPath ) {

                                                v( vert.x, vert.y, depth / steps * s );

                                        } else {

                                                // v( vert.x, vert.y + extrudePts[ s - 1 ].y, extrudePts[ s - 1 ].x );

                                                normal.copy( splineTube.normals[ s ] ).multiplyScalar( vert.x );
                                                binormal.copy( splineTube.binormals[ s ] ).multiplyScalar( vert.y );

                                                position2.copy( extrudePts[ s ] ).add( normal ).add( binormal );

                                                v( position2.x, position2.y, position2.z );

                                        }

                                }

                        }


                        // Add bevel segments planes

                        //for ( b = 1; b <= bevelSegments; b ++ ) {
                        for ( let b = bevelSegments - 1; b >= 0; b -- ) {

                                const t = b / bevelSegments;
                                const z = bevelThickness * Math.cos( t * Math.PI / 2 );
                                const bs = bevelSize * Math.sin( t * Math.PI / 2 ) + bevelOffset;

                                // contract shape

                                for ( let i = 0, il = contour.length; i < il; i ++ ) {

                                        const vert = scalePt2( contour[ i ], contourMovements[ i ], bs );
                                        v( vert.x, vert.y, depth + z );

                                }

                                // expand holes

                                for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

                                        const ahole = holes[ h ];
                                        oneHoleMovements = holesMovements[ h ];

                                        for ( let i = 0, il = ahole.length; i < il; i ++ ) {

                                                const vert = scalePt2( ahole[ i ], oneHoleMovements[ i ], bs );

                                                if ( ! extrudeByPath ) {

                                                        v( vert.x, vert.y, depth + z );

                                                } else {

                                                        v( vert.x, vert.y + extrudePts[ steps - 1 ].y, extrudePts[ steps - 1 ].x + z );

                                                }

                                        }

                                }

                        }

                        /* Faces */

                        // Top and bottom faces

                        buildLidFaces();

                        // Sides faces

                        buildSideFaces();


                        /////  Internal functions

                        function buildLidFaces() {

                                const start = verticesArray.length / 3;

                                if ( bevelEnabled ) {

                                        let layer = 0; // steps + 1
                                        let offset = vlen * layer;

                                        // Bottom faces

                                        for ( let i = 0; i < flen; i ++ ) {

                                                const face = faces[ i ];
                                                f3( face[ 2 ] + offset, face[ 1 ] + offset, face[ 0 ] + offset );

                                        }

                                        layer = steps + bevelSegments * 2;
                                        offset = vlen * layer;

                                        // Top faces

                                        for ( let i = 0; i < flen; i ++ ) {

                                                const face = faces[ i ];
                                                f3( face[ 0 ] + offset, face[ 1 ] + offset, face[ 2 ] + offset );

                                        }

                                } else {

                                        // Bottom faces

                                        for ( let i = 0; i < flen; i ++ ) {

                                                const face = faces[ i ];
                                                f3( face[ 2 ], face[ 1 ], face[ 0 ] );

                                        }

                                        // Top faces

                                        for ( let i = 0; i < flen; i ++ ) {

                                                const face = faces[ i ];
                                                f3( face[ 0 ] + vlen * steps, face[ 1 ] + vlen * steps, face[ 2 ] + vlen * steps );

                                        }

                                }

                                scope.addGroup( start, verticesArray.length / 3 - start, 0 );

                        }

                        // Create faces for the z-sides of the shape

                        function buildSideFaces() {

                                const start = verticesArray.length / 3;
                                let layeroffset = 0;
                                sidewalls( contour, layeroffset );
                                layeroffset += contour.length;

                                for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

                                        const ahole = holes[ h ];
                                        sidewalls( ahole, layeroffset );

                                        //, true
                                        layeroffset += ahole.length;

                                }


                                scope.addGroup( start, verticesArray.length / 3 - start, 1 );


                        }

                        function sidewalls( contour, layeroffset ) {

                                let i = contour.length;

                                while ( -- i >= 0 ) {

                                        const j = i;
                                        let k = i - 1;
                                        if ( k < 0 ) k = contour.length - 1;

                                        //console.log('b', i,j, i-1, k,vertices.length);

                                        for ( let s = 0, sl = ( steps + bevelSegments * 2 ); s < sl; s ++ ) {

                                                const slen1 = vlen * s;
                                                const slen2 = vlen * ( s + 1 );

                                                const a = layeroffset + j + slen1,
                                                        b = layeroffset + k + slen1,
                                                        c = layeroffset + k + slen2,
                                                        d = layeroffset + j + slen2;

                                                f4( a, b, c, d );

                                        }

                                }

                        }

                        function v( x, y, z ) {

                                placeholder.push( x );
                                placeholder.push( y );
                                placeholder.push( z );

                        }


                        function f3( a, b, c ) {

                                addVertex( a );
                                addVertex( b );
                                addVertex( c );

                                const nextIndex = verticesArray.length / 3;
                                const uvs = uvgen.generateTopUV( scope, verticesArray, nextIndex - 3, nextIndex - 2, nextIndex - 1 );

                                addUV( uvs[ 0 ] );
                                addUV( uvs[ 1 ] );
                                addUV( uvs[ 2 ] );

                        }

                        function f4( a, b, c, d ) {

                                addVertex( a );
                                addVertex( b );
                                addVertex( d );

                                addVertex( b );
                                addVertex( c );
                                addVertex( d );


                                const nextIndex = verticesArray.length / 3;
                                const uvs = uvgen.generateSideWallUV( scope, verticesArray, nextIndex - 6, nextIndex - 3, nextIndex - 2, nextIndex - 1 );

                                addUV( uvs[ 0 ] );
                                addUV( uvs[ 1 ] );
                                addUV( uvs[ 3 ] );

                                addUV( uvs[ 1 ] );
                                addUV( uvs[ 2 ] );
                                addUV( uvs[ 3 ] );

                        }

                        function addVertex( index ) {

                                verticesArray.push( placeholder[ index * 3 + 0 ] );
                                verticesArray.push( placeholder[ index * 3 + 1 ] );
                                verticesArray.push( placeholder[ index * 3 + 2 ] );

                        }


                        function addUV( vector2 ) {

                                uvArray.push( vector2.x );
                                uvArray.push( vector2.y );

                        }

                }

        }

        toJSON() {

                const data = BufferGeometry.prototype.toJSON.call( this );

                const shapes = this.parameters.shapes;
                const options = this.parameters.options;

                return toJSON( shapes, options, data );

        }

}

const WorldUVGenerator = {

        generateTopUV: function ( geometry, vertices, indexA, indexB, indexC ) {

                const a_x = vertices[ indexA * 3 ];
                const a_y = vertices[ indexA * 3 + 1 ];
                const b_x = vertices[ indexB * 3 ];
                const b_y = vertices[ indexB * 3 + 1 ];
                const c_x = vertices[ indexC * 3 ];
                const c_y = vertices[ indexC * 3 + 1 ];

                return [
                        new Vector2( a_x, a_y ),
                        new Vector2( b_x, b_y ),
                        new Vector2( c_x, c_y )
                ];

        },

        generateSideWallUV: function ( geometry, vertices, indexA, indexB, indexC, indexD ) {

                const a_x = vertices[ indexA * 3 ];
                const a_y = vertices[ indexA * 3 + 1 ];
                const a_z = vertices[ indexA * 3 + 2 ];
                const b_x = vertices[ indexB * 3 ];
                const b_y = vertices[ indexB * 3 + 1 ];
                const b_z = vertices[ indexB * 3 + 2 ];
                const c_x = vertices[ indexC * 3 ];
                const c_y = vertices[ indexC * 3 + 1 ];
                const c_z = vertices[ indexC * 3 + 2 ];
                const d_x = vertices[ indexD * 3 ];
                const d_y = vertices[ indexD * 3 + 1 ];
                const d_z = vertices[ indexD * 3 + 2 ];

                if ( Math.abs( a_y - b_y ) < 0.01 ) {

                        return [
                                new Vector2( a_x, 1 - a_z ),
                                new Vector2( b_x, 1 - b_z ),
                                new Vector2( c_x, 1 - c_z ),
                                new Vector2( d_x, 1 - d_z )
                        ];

                } else {

                        return [
                                new Vector2( a_y, 1 - a_z ),
                                new Vector2( b_y, 1 - b_z ),
                                new Vector2( c_y, 1 - c_z ),
                                new Vector2( d_y, 1 - d_z )
                        ];

                }

        }

};

function toJSON( shapes, options, data ) {

        data.shapes = [];

        if ( Array.isArray( shapes ) ) {

                for ( let i = 0, l = shapes.length; i < l; i ++ ) {

                        const shape = shapes[ i ];

                        data.shapes.push( shape.uuid );

                }

        } else {

                data.shapes.push( shapes.uuid );

        }

        if ( options.extrudePath !== undefined ) data.options.extrudePath = options.extrudePath.toJSON();

        return data;

}

/**
 * Creates extruded geometry from a path shape.
 *
 * parameters = {
 *
 *  curveSegments: <int>, // number of points on the curves
 *  steps: <int>, // number of points for z-side extrusions / used for subdividing segments of extrude spline too
 *  depth: <float>, // Depth to extrude the shape
 *
 *  bevelEnabled: <bool>, // turn on bevel
 *  bevelThickness: <float>, // how deep into the original shape bevel goes
 *  bevelSize: <float>, // how far from shape outline (including bevelOffset) is bevel
 *  bevelOffset: <float>, // how far from shape outline does bevel start
 *  bevelSegments: <int>, // number of bevel layers
 *
 *  extrudePath: <THREE.Curve> // curve to extrude shape along
 *
 *  UVGenerator: <Object> // object that provides UV generator functions
 *
 * }
 */

class ExtrudeGeometry extends Geometry {

        constructor( shapes, options ) {

                super();

                this.type = 'ExtrudeGeometry';

                this.parameters = {
                        shapes: shapes,
                        options: options
                };

                this.fromBufferGeometry( new ExtrudeBufferGeometry( shapes, options ) );
                this.mergeVertices();

        }

        toJSON() {

                const data = super.toJSON();

                const shapes = this.parameters.shapes;
                const options = this.parameters.options;

                return toJSON$1( shapes, options, data );

        }

}

function toJSON$1( shapes, options, data ) {

        data.shapes = [];

        if ( Array.isArray( shapes ) ) {

                for ( let i = 0, l = shapes.length; i < l; i ++ ) {

                        const shape = shapes[ i ];

                        data.shapes.push( shape.uuid );

                }

        } else {

                data.shapes.push( shapes.uuid );

        }

        if ( options.extrudePath !== undefined ) data.options.extrudePath = options.extrudePath.toJSON();

        return data;

}

class IcosahedronBufferGeometry extends PolyhedronBufferGeometry {

        constructor( radius = 1, detail = 0 ) {

                const t = ( 1 + Math.sqrt( 5 ) ) / 2;

                const vertices = [
                        - 1, t, 0,      1, t, 0,        - 1, - t, 0,    1, - t, 0,
                        0, - 1, t,      0, 1, t,        0, - 1, - t,    0, 1, - t,
                        t, 0, - 1,      t, 0, 1,        - t, 0, - 1,    - t, 0, 1
                ];

                const indices = [
                        0, 11, 5,       0, 5, 1,        0, 1, 7,        0, 7, 10,       0, 10, 11,
                        1, 5, 9,        5, 11, 4,       11, 10, 2,      10, 7, 6,       7, 1, 8,
                        3, 9, 4,        3, 4, 2,        3, 2, 6,        3, 6, 8,        3, 8, 9,
                        4, 9, 5,        2, 4, 11,       6, 2, 10,       8, 6, 7,        9, 8, 1
                ];

                super( vertices, indices, radius, detail );

                this.type = 'IcosahedronBufferGeometry';

                this.parameters = {
                        radius: radius,
                        detail: detail
                };

        }

}

class IcosahedronGeometry extends Geometry {

        constructor( radius, detail ) {

                super();

                this.type = 'IcosahedronGeometry';

                this.parameters = {
                        radius: radius,
                        detail: detail
                };

                this.fromBufferGeometry( new IcosahedronBufferGeometry( radius, detail ) );
                this.mergeVertices();

        }

}

class LatheBufferGeometry extends BufferGeometry {

        constructor( points, segments = 12, phiStart = 0, phiLength = Math.PI * 2 ) {

                super();

                this.type = 'LatheBufferGeometry';

                this.parameters = {
                        points: points,
                        segments: segments,
                        phiStart: phiStart,
                        phiLength: phiLength
                };

                segments = Math.floor( segments );

                // clamp phiLength so it's in range of [ 0, 2PI ]

                phiLength = MathUtils.clamp( phiLength, 0, Math.PI * 2 );

                // buffers

                const indices = [];
                const vertices = [];
                const uvs = [];

                // helper variables

                const inverseSegments = 1.0 / segments;
                const vertex = new Vector3();
                const uv = new Vector2();

                // generate vertices and uvs

                for ( let i = 0; i <= segments; i ++ ) {

                        const phi = phiStart + i * inverseSegments * phiLength;

                        const sin = Math.sin( phi );
                        const cos = Math.cos( phi );

                        for ( let j = 0; j <= ( points.length - 1 ); j ++ ) {

                                // vertex

                                vertex.x = points[ j ].x * sin;
                                vertex.y = points[ j ].y;
                                vertex.z = points[ j ].x * cos;

                                vertices.push( vertex.x, vertex.y, vertex.z );

                                // uv

                                uv.x = i / segments;
                                uv.y = j / ( points.length - 1 );

                                uvs.push( uv.x, uv.y );


                        }

                }

                // indices

                for ( let i = 0; i < segments; i ++ ) {

                        for ( let j = 0; j < ( points.length - 1 ); j ++ ) {

                                const base = j + i * points.length;

                                const a = base;
                                const b = base + points.length;
                                const c = base + points.length + 1;
                                const d = base + 1;

                                // faces

                                indices.push( a, b, d );
                                indices.push( b, c, d );

                        }

                }

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

                // generate normals

                this.computeVertexNormals();

                // if the geometry is closed, we need to average the normals along the seam.
                // because the corresponding vertices are identical (but still have different UVs).

                if ( phiLength === Math.PI * 2 ) {

                        const normals = this.attributes.normal.array;
                        const n1 = new Vector3();
                        const n2 = new Vector3();
                        const n = new Vector3();

                        // this is the buffer offset for the last line of vertices

                        const base = segments * points.length * 3;

                        for ( let i = 0, j = 0; i < points.length; i ++, j += 3 ) {

                                // select the normal of the vertex in the first line

                                n1.x = normals[ j + 0 ];
                                n1.y = normals[ j + 1 ];
                                n1.z = normals[ j + 2 ];

                                // select the normal of the vertex in the last line

                                n2.x = normals[ base + j + 0 ];
                                n2.y = normals[ base + j + 1 ];
                                n2.z = normals[ base + j + 2 ];

                                // average normals

                                n.addVectors( n1, n2 ).normalize();

                                // assign the new values to both normals

                                normals[ j + 0 ] = normals[ base + j + 0 ] = n.x;
                                normals[ j + 1 ] = normals[ base + j + 1 ] = n.y;
                                normals[ j + 2 ] = normals[ base + j + 2 ] = n.z;

                        }

                }

        }

}

class LatheGeometry extends Geometry {

        constructor( points, segments, phiStart, phiLength ) {

                super();

                this.type = 'LatheGeometry';

                this.parameters = {
                        points: points,
                        segments: segments,
                        phiStart: phiStart,
                        phiLength: phiLength
                };

                this.fromBufferGeometry( new LatheBufferGeometry( points, segments, phiStart, phiLength ) );
                this.mergeVertices();

        }

}

class OctahedronBufferGeometry extends PolyhedronBufferGeometry {

        constructor( radius = 1, detail = 0 ) {

                const vertices = [
                        1, 0, 0,        - 1, 0, 0,      0, 1, 0,
                        0, - 1, 0,      0, 0, 1,        0, 0, - 1
                ];

                const indices = [
                        0, 2, 4,        0, 4, 3,        0, 3, 5,
                        0, 5, 2,        1, 2, 5,        1, 5, 3,
                        1, 3, 4,        1, 4, 2
                ];

                super( vertices, indices, radius, detail );

                this.type = 'OctahedronBufferGeometry';

                this.parameters = {
                        radius: radius,
                        detail: detail
                };

        }

}

class OctahedronGeometry extends Geometry {

        constructor( radius, detail ) {

                super();

                this.type = 'OctahedronGeometry';

                this.parameters = {
                        radius: radius,
                        detail: detail
                };

                this.fromBufferGeometry( new OctahedronBufferGeometry( radius, detail ) );
                this.mergeVertices();

        }

}

/**
 * Parametric Surfaces Geometry
 * based on the brilliant article by @prideout https://prideout.net/blog/old/blog/index.html@p=44.html
 */

function ParametricBufferGeometry( func, slices, stacks ) {

        BufferGeometry.call( this );

        this.type = 'ParametricBufferGeometry';

        this.parameters = {
                func: func,
                slices: slices,
                stacks: stacks
        };

        // buffers

        const indices = [];
        const vertices = [];
        const normals = [];
        const uvs = [];

        const EPS = 0.00001;

        const normal = new Vector3();

        const p0 = new Vector3(), p1 = new Vector3();
        const pu = new Vector3(), pv = new Vector3();

        if ( func.length < 3 ) {

                console.error( 'THREE.ParametricGeometry: Function must now modify a Vector3 as third parameter.' );

        }

        // generate vertices, normals and uvs

        const sliceCount = slices + 1;

        for ( let i = 0; i <= stacks; i ++ ) {

                const v = i / stacks;

                for ( let j = 0; j <= slices; j ++ ) {

                        const u = j / slices;

                        // vertex

                        func( u, v, p0 );
                        vertices.push( p0.x, p0.y, p0.z );

                        // normal

                        // approximate tangent vectors via finite differences

                        if ( u - EPS >= 0 ) {

                                func( u - EPS, v, p1 );
                                pu.subVectors( p0, p1 );

                        } else {

                                func( u + EPS, v, p1 );
                                pu.subVectors( p1, p0 );

                        }

                        if ( v - EPS >= 0 ) {

                                func( u, v - EPS, p1 );
                                pv.subVectors( p0, p1 );

                        } else {

                                func( u, v + EPS, p1 );
                                pv.subVectors( p1, p0 );

                        }

                        // cross product of tangent vectors returns surface normal

                        normal.crossVectors( pu, pv ).normalize();
                        normals.push( normal.x, normal.y, normal.z );

                        // uv

                        uvs.push( u, v );

                }

        }

        // generate indices

        for ( let i = 0; i < stacks; i ++ ) {

                for ( let j = 0; j < slices; j ++ ) {

                        const a = i * sliceCount + j;
                        const b = i * sliceCount + j + 1;
                        const c = ( i + 1 ) * sliceCount + j + 1;
                        const d = ( i + 1 ) * sliceCount + j;

                        // faces one and two

                        indices.push( a, b, d );
                        indices.push( b, c, d );

                }

        }

        // build geometry

        this.setIndex( indices );
        this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
        this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
        this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

}

ParametricBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
ParametricBufferGeometry.prototype.constructor = ParametricBufferGeometry;

/**
 * Parametric Surfaces Geometry
 * based on the brilliant article by @prideout https://prideout.net/blog/old/blog/index.html@p=44.html
 */

function ParametricGeometry( func, slices, stacks ) {

        Geometry.call( this );

        this.type = 'ParametricGeometry';

        this.parameters = {
                func: func,
                slices: slices,
                stacks: stacks
        };

        this.fromBufferGeometry( new ParametricBufferGeometry( func, slices, stacks ) );
        this.mergeVertices();

}

ParametricGeometry.prototype = Object.create( Geometry.prototype );
ParametricGeometry.prototype.constructor = ParametricGeometry;

class PlaneGeometry extends Geometry {

        constructor( width, height, widthSegments, heightSegments ) {

                super();

                this.type = 'PlaneGeometry';

                this.parameters = {
                        width: width,
                        height: height,
                        widthSegments: widthSegments,
                        heightSegments: heightSegments
                };

                this.fromBufferGeometry( new PlaneBufferGeometry( width, height, widthSegments, heightSegments ) );
                this.mergeVertices();

        }

}

class PolyhedronGeometry extends Geometry {

        constructor( vertices, indices, radius, detail ) {

                super();

                this.type = 'PolyhedronGeometry';

                this.parameters = {
                        vertices: vertices,
                        indices: indices,
                        radius: radius,
                        detail: detail
                };

                this.fromBufferGeometry( new PolyhedronBufferGeometry( vertices, indices, radius, detail ) );
                this.mergeVertices();

        }

}

class RingBufferGeometry extends BufferGeometry {

        constructor( innerRadius = 0.5, outerRadius = 1, thetaSegments = 8, phiSegments = 1, thetaStart = 0, thetaLength = Math.PI * 2 ) {

                super();

                this.type = 'RingBufferGeometry';

                this.parameters = {
                        innerRadius: innerRadius,
                        outerRadius: outerRadius,
                        thetaSegments: thetaSegments,
                        phiSegments: phiSegments,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

                thetaSegments = Math.max( 3, thetaSegments );
                phiSegments = Math.max( 1, phiSegments );

                // buffers

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                // some helper variables

                let radius = innerRadius;
                const radiusStep = ( ( outerRadius - innerRadius ) / phiSegments );
                const vertex = new Vector3();
                const uv = new Vector2();

                // generate vertices, normals and uvs

                for ( let j = 0; j <= phiSegments; j ++ ) {

                        for ( let i = 0; i <= thetaSegments; i ++ ) {

                                // values are generate from the inside of the ring to the outside

                                const segment = thetaStart + i / thetaSegments * thetaLength;

                                // vertex

                                vertex.x = radius * Math.cos( segment );
                                vertex.y = radius * Math.sin( segment );

                                vertices.push( vertex.x, vertex.y, vertex.z );

                                // normal

                                normals.push( 0, 0, 1 );

                                // uv

                                uv.x = ( vertex.x / outerRadius + 1 ) / 2;
                                uv.y = ( vertex.y / outerRadius + 1 ) / 2;

                                uvs.push( uv.x, uv.y );

                        }

                        // increase the radius for next row of vertices

                        radius += radiusStep;

                }

                // indices

                for ( let j = 0; j < phiSegments; j ++ ) {

                        const thetaSegmentLevel = j * ( thetaSegments + 1 );

                        for ( let i = 0; i < thetaSegments; i ++ ) {

                                const segment = i + thetaSegmentLevel;

                                const a = segment;
                                const b = segment + thetaSegments + 1;
                                const c = segment + thetaSegments + 2;
                                const d = segment + 1;

                                // faces

                                indices.push( a, b, d );
                                indices.push( b, c, d );

                        }

                }

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

        }

}

class RingGeometry extends Geometry {

        constructor( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) {

                super();

                this.type = 'RingGeometry';

                this.parameters = {
                        innerRadius: innerRadius,
                        outerRadius: outerRadius,
                        thetaSegments: thetaSegments,
                        phiSegments: phiSegments,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

                this.fromBufferGeometry( new RingBufferGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) );
                this.mergeVertices();

        }

}

class ShapeBufferGeometry extends BufferGeometry {

        constructor( shapes, curveSegments = 12 ) {

                super();
                this.type = 'ShapeBufferGeometry';

                this.parameters = {
                        shapes: shapes,
                        curveSegments: curveSegments
                };

                // buffers

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                // helper variables

                let groupStart = 0;
                let groupCount = 0;

                // allow single and array values for "shapes" parameter

                if ( Array.isArray( shapes ) === false ) {

                        addShape( shapes );

                } else {

                        for ( let i = 0; i < shapes.length; i ++ ) {

                                addShape( shapes[ i ] );

                                this.addGroup( groupStart, groupCount, i ); // enables MultiMaterial support

                                groupStart += groupCount;
                                groupCount = 0;

                        }

                }

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


                // helper functions

                function addShape( shape ) {

                        const indexOffset = vertices.length / 3;
                        const points = shape.extractPoints( curveSegments );

                        let shapeVertices = points.shape;
                        const shapeHoles = points.holes;

                        // check direction of vertices

                        if ( ShapeUtils.isClockWise( shapeVertices ) === false ) {

                                shapeVertices = shapeVertices.reverse();

                        }

                        for ( let i = 0, l = shapeHoles.length; i < l; i ++ ) {

                                const shapeHole = shapeHoles[ i ];

                                if ( ShapeUtils.isClockWise( shapeHole ) === true ) {

                                        shapeHoles[ i ] = shapeHole.reverse();

                                }

                        }

                        const faces = ShapeUtils.triangulateShape( shapeVertices, shapeHoles );

                        // join vertices of inner and outer paths to a single array

                        for ( let i = 0, l = shapeHoles.length; i < l; i ++ ) {

                                const shapeHole = shapeHoles[ i ];
                                shapeVertices = shapeVertices.concat( shapeHole );

                        }

                        // vertices, normals, uvs

                        for ( let i = 0, l = shapeVertices.length; i < l; i ++ ) {

                                const vertex = shapeVertices[ i ];

                                vertices.push( vertex.x, vertex.y, 0 );
                                normals.push( 0, 0, 1 );
                                uvs.push( vertex.x, vertex.y ); // world uvs

                        }

                        // incides

                        for ( let i = 0, l = faces.length; i < l; i ++ ) {

                                const face = faces[ i ];

                                const a = face[ 0 ] + indexOffset;
                                const b = face[ 1 ] + indexOffset;
                                const c = face[ 2 ] + indexOffset;

                                indices.push( a, b, c );
                                groupCount += 3;

                        }

                }

        }

        toJSON() {

                const data = BufferGeometry.prototype.toJSON.call( this );

                const shapes = this.parameters.shapes;

                return toJSON$2( shapes, data );

        }

}

function toJSON$2( shapes, data ) {

        data.shapes = [];

        if ( Array.isArray( shapes ) ) {

                for ( let i = 0, l = shapes.length; i < l; i ++ ) {

                        const shape = shapes[ i ];

                        data.shapes.push( shape.uuid );

                }

        } else {

                data.shapes.push( shapes.uuid );

        }

        return data;

}

class ShapeGeometry extends Geometry {

        constructor( shapes, curveSegments ) {

                super();
                this.type = 'ShapeGeometry';

                if ( typeof curveSegments === 'object' ) {

                        console.warn( 'THREE.ShapeGeometry: Options parameter has been removed.' );

                        curveSegments = curveSegments.curveSegments;

                }

                this.parameters = {
                        shapes: shapes,
                        curveSegments: curveSegments
                };

                this.fromBufferGeometry( new ShapeBufferGeometry( shapes, curveSegments ) );
                this.mergeVertices();

        }

        toJSON() {

                const data = Geometry.prototype.toJSON.call( this );

                const shapes = this.parameters.shapes;

                return toJSON$3( shapes, data );

        }

}

function toJSON$3( shapes, data ) {

        data.shapes = [];

        if ( Array.isArray( shapes ) ) {

                for ( let i = 0, l = shapes.length; i < l; i ++ ) {

                        const shape = shapes[ i ];

                        data.shapes.push( shape.uuid );

                }

        } else {

                data.shapes.push( shapes.uuid );

        }

        return data;

}

class SphereBufferGeometry extends BufferGeometry {

        constructor( radius = 1, widthSegments = 8, heightSegments = 6, phiStart = 0, phiLength = Math.PI * 2, thetaStart = 0, thetaLength = Math.PI ) {

                super();
                this.type = 'SphereBufferGeometry';

                this.parameters = {
                        radius: radius,
                        widthSegments: widthSegments,
                        heightSegments: heightSegments,
                        phiStart: phiStart,
                        phiLength: phiLength,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

                widthSegments = Math.max( 3, Math.floor( widthSegments ) );
                heightSegments = Math.max( 2, Math.floor( heightSegments ) );

                const thetaEnd = Math.min( thetaStart + thetaLength, Math.PI );

                let index = 0;
                const grid = [];

                const vertex = new Vector3();
                const normal = new Vector3();

                // buffers

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                // generate vertices, normals and uvs

                for ( let iy = 0; iy <= heightSegments; iy ++ ) {

                        const verticesRow = [];

                        const v = iy / heightSegments;

                        // special case for the poles

                        let uOffset = 0;

                        if ( iy == 0 && thetaStart == 0 ) {

                                uOffset = 0.5 / widthSegments;

                        } else if ( iy == heightSegments && thetaEnd == Math.PI ) {

                                uOffset = - 0.5 / widthSegments;

                        }

                        for ( let ix = 0; ix <= widthSegments; ix ++ ) {

                                const u = ix / widthSegments;

                                // vertex

                                vertex.x = - radius * Math.cos( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
                                vertex.y = radius * Math.cos( thetaStart + v * thetaLength );
                                vertex.z = radius * Math.sin( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );

                                vertices.push( vertex.x, vertex.y, vertex.z );

                                // normal

                                normal.copy( vertex ).normalize();
                                normals.push( normal.x, normal.y, normal.z );

                                // uv

                                uvs.push( u + uOffset, 1 - v );

                                verticesRow.push( index ++ );

                        }

                        grid.push( verticesRow );

                }

                // indices

                for ( let iy = 0; iy < heightSegments; iy ++ ) {

                        for ( let ix = 0; ix < widthSegments; ix ++ ) {

                                const a = grid[ iy ][ ix + 1 ];
                                const b = grid[ iy ][ ix ];
                                const c = grid[ iy + 1 ][ ix ];
                                const d = grid[ iy + 1 ][ ix + 1 ];

                                if ( iy !== 0 || thetaStart > 0 ) indices.push( a, b, d );
                                if ( iy !== heightSegments - 1 || thetaEnd < Math.PI ) indices.push( b, c, d );

                        }

                }

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

        }

}

class SphereGeometry extends Geometry {

        constructor( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) {

                super();
                this.type = 'SphereGeometry';

                this.parameters = {
                        radius: radius,
                        widthSegments: widthSegments,
                        heightSegments: heightSegments,
                        phiStart: phiStart,
                        phiLength: phiLength,
                        thetaStart: thetaStart,
                        thetaLength: thetaLength
                };

                this.fromBufferGeometry( new SphereBufferGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) );
                this.mergeVertices();

        }

}

class TetrahedronBufferGeometry extends PolyhedronBufferGeometry {

        constructor( radius = 1, detail = 0 ) {

                const vertices = [
                        1, 1, 1,        - 1, - 1, 1,    - 1, 1, - 1,    1, - 1, - 1
                ];

                const indices = [
                        2, 1, 0,        0, 3, 2,        1, 3, 0,        2, 3, 1
                ];

                super( vertices, indices, radius, detail );

                this.type = 'TetrahedronBufferGeometry';

                this.parameters = {
                        radius: radius,
                        detail: detail
                };

        }

}

class TetrahedronGeometry extends Geometry {

        constructor( radius, detail ) {

                super();
                this.type = 'TetrahedronGeometry';

                this.parameters = {
                        radius: radius,
                        detail: detail
                };

                this.fromBufferGeometry( new TetrahedronBufferGeometry( radius, detail ) );
                this.mergeVertices();

        }

}

/**
 * Text = 3D Text
 *
 * parameters = {
 *  font: <THREE.Font>, // font
 *
 *  size: <float>, // size of the text
 *  height: <float>, // thickness to extrude text
 *  curveSegments: <int>, // number of points on the curves
 *
 *  bevelEnabled: <bool>, // turn on bevel
 *  bevelThickness: <float>, // how deep into text bevel goes
 *  bevelSize: <float>, // how far from text outline (including bevelOffset) is bevel
 *  bevelOffset: <float> // how far from text outline does bevel start
 * }
 */

class TextBufferGeometry extends ExtrudeBufferGeometry {

        constructor( text, parameters = {} ) {

                const font = parameters.font;

                if ( ! ( font && font.isFont ) ) {

                        console.error( 'THREE.TextGeometry: font parameter is not an instance of THREE.Font.' );
                        return new BufferGeometry();

                }

                const shapes = font.generateShapes( text, parameters.size );

                // translate parameters to ExtrudeGeometry API

                parameters.depth = parameters.height !== undefined ? parameters.height : 50;

                // defaults

                if ( parameters.bevelThickness === undefined ) parameters.bevelThickness = 10;
                if ( parameters.bevelSize === undefined ) parameters.bevelSize = 8;
                if ( parameters.bevelEnabled === undefined ) parameters.bevelEnabled = false;

                super( shapes, parameters );

                this.type = 'TextBufferGeometry';

        }

}

/**
 * Text = 3D Text
 *
 * parameters = {
 *  font: <THREE.Font>, // font
 *
 *  size: <float>, // size of the text
 *  height: <float>, // thickness to extrude text
 *  curveSegments: <int>, // number of points on the curves
 *
 *  bevelEnabled: <bool>, // turn on bevel
 *  bevelThickness: <float>, // how deep into text bevel goes
 *  bevelSize: <float>, // how far from text outline (including bevelOffset) is bevel
 *  bevelOffset: <float> // how far from text outline does bevel start
 * }
 */

class TextGeometry extends Geometry {

        constructor( text, parameters ) {

                super();
                this.type = 'TextGeometry';

                this.parameters = {
                        text: text,
                        parameters: parameters
                };

                this.fromBufferGeometry( new TextBufferGeometry( text, parameters ) );
                this.mergeVertices();

        }

}

class TorusBufferGeometry extends BufferGeometry {

        constructor( radius = 1, tube = 0.4, radialSegments = 8, tubularSegments = 6, arc = Math.PI * 2 ) {

                super();
                this.type = 'TorusBufferGeometry';

                this.parameters = {
                        radius: radius,
                        tube: tube,
                        radialSegments: radialSegments,
                        tubularSegments: tubularSegments,
                        arc: arc
                };

                radialSegments = Math.floor( radialSegments );
                tubularSegments = Math.floor( tubularSegments );

                // buffers

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                // helper variables

                const center = new Vector3();
                const vertex = new Vector3();
                const normal = new Vector3();

                // generate vertices, normals and uvs

                for ( let j = 0; j <= radialSegments; j ++ ) {

                        for ( let i = 0; i <= tubularSegments; i ++ ) {

                                const u = i / tubularSegments * arc;
                                const v = j / radialSegments * Math.PI * 2;

                                // vertex

                                vertex.x = ( radius + tube * Math.cos( v ) ) * Math.cos( u );
                                vertex.y = ( radius + tube * Math.cos( v ) ) * Math.sin( u );
                                vertex.z = tube * Math.sin( v );

                                vertices.push( vertex.x, vertex.y, vertex.z );

                                // normal

                                center.x = radius * Math.cos( u );
                                center.y = radius * Math.sin( u );
                                normal.subVectors( vertex, center ).normalize();

                                normals.push( normal.x, normal.y, normal.z );

                                // uv

                                uvs.push( i / tubularSegments );
                                uvs.push( j / radialSegments );

                        }

                }

                // generate indices

                for ( let j = 1; j <= radialSegments; j ++ ) {

                        for ( let i = 1; i <= tubularSegments; i ++ ) {

                                // indices

                                const a = ( tubularSegments + 1 ) * j + i - 1;
                                const b = ( tubularSegments + 1 ) * ( j - 1 ) + i - 1;
                                const c = ( tubularSegments + 1 ) * ( j - 1 ) + i;
                                const d = ( tubularSegments + 1 ) * j + i;

                                // faces

                                indices.push( a, b, d );
                                indices.push( b, c, d );

                        }

                }

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

        }

}

class TorusGeometry extends Geometry {

        constructor( radius, tube, radialSegments, tubularSegments, arc ) {

                super();
                this.type = 'TorusGeometry';

                this.parameters = {
                        radius: radius,
                        tube: tube,
                        radialSegments: radialSegments,
                        tubularSegments: tubularSegments,
                        arc: arc
                };

                this.fromBufferGeometry( new TorusBufferGeometry( radius, tube, radialSegments, tubularSegments, arc ) );
                this.mergeVertices();

        }

}

class TorusKnotBufferGeometry extends BufferGeometry {

        constructor( radius = 1, tube = 0.4, tubularSegments = 64, radialSegments = 8, p = 2, q = 3 ) {

                super();
                this.type = 'TorusKnotBufferGeometry';

                this.parameters = {
                        radius: radius,
                        tube: tube,
                        tubularSegments: tubularSegments,
                        radialSegments: radialSegments,
                        p: p,
                        q: q
                };

                tubularSegments = Math.floor( tubularSegments );
                radialSegments = Math.floor( radialSegments );

                // buffers

                const indices = [];
                const vertices = [];
                const normals = [];
                const uvs = [];

                // helper variables

                const vertex = new Vector3();
                const normal = new Vector3();

                const P1 = new Vector3();
                const P2 = new Vector3();

                const B = new Vector3();
                const T = new Vector3();
                const N = new Vector3();

                // generate vertices, normals and uvs

                for ( let i = 0; i <= tubularSegments; ++ i ) {

                        // the radian "u" is used to calculate the position on the torus curve of the current tubular segement

                        const u = i / tubularSegments * p * Math.PI * 2;

                        // now we calculate two points. P1 is our current position on the curve, P2 is a little farther ahead.
                        // these points are used to create a special "coordinate space", which is necessary to calculate the correct vertex positions

                        calculatePositionOnCurve( u, p, q, radius, P1 );
                        calculatePositionOnCurve( u + 0.01, p, q, radius, P2 );

                        // calculate orthonormal basis

                        T.subVectors( P2, P1 );
                        N.addVectors( P2, P1 );
                        B.crossVectors( T, N );
                        N.crossVectors( B, T );

                        // normalize B, N. T can be ignored, we don't use it

                        B.normalize();
                        N.normalize();

                        for ( let j = 0; j <= radialSegments; ++ j ) {

                                // now calculate the vertices. they are nothing more than an extrusion of the torus curve.
                                // because we extrude a shape in the xy-plane, there is no need to calculate a z-value.

                                const v = j / radialSegments * Math.PI * 2;
                                const cx = - tube * Math.cos( v );
                                const cy = tube * Math.sin( v );

                                // now calculate the final vertex position.
                                // first we orient the extrusion with our basis vectos, then we add it to the current position on the curve

                                vertex.x = P1.x + ( cx * N.x + cy * B.x );
                                vertex.y = P1.y + ( cx * N.y + cy * B.y );
                                vertex.z = P1.z + ( cx * N.z + cy * B.z );

                                vertices.push( vertex.x, vertex.y, vertex.z );

                                // normal (P1 is always the center/origin of the extrusion, thus we can use it to calculate the normal)

                                normal.subVectors( vertex, P1 ).normalize();

                                normals.push( normal.x, normal.y, normal.z );

                                // uv

                                uvs.push( i / tubularSegments );
                                uvs.push( j / radialSegments );

                        }

                }

                // generate indices

                for ( let j = 1; j <= tubularSegments; j ++ ) {

                        for ( let i = 1; i <= radialSegments; i ++ ) {

                                // indices

                                const a = ( radialSegments + 1 ) * ( j - 1 ) + ( i - 1 );
                                const b = ( radialSegments + 1 ) * j + ( i - 1 );
                                const c = ( radialSegments + 1 ) * j + i;
                                const d = ( radialSegments + 1 ) * ( j - 1 ) + i;

                                // faces

                                indices.push( a, b, d );
                                indices.push( b, c, d );

                        }

                }

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

                // this function calculates the current position on the torus curve

                function calculatePositionOnCurve( u, p, q, radius, position ) {

                        const cu = Math.cos( u );
                        const su = Math.sin( u );
                        const quOverP = q / p * u;
                        const cs = Math.cos( quOverP );

                        position.x = radius * ( 2 + cs ) * 0.5 * cu;
                        position.y = radius * ( 2 + cs ) * su * 0.5;
                        position.z = radius * Math.sin( quOverP ) * 0.5;

                }

        }

}

class TorusKnotGeometry extends Geometry {

        constructor( radius, tube, tubularSegments, radialSegments, p, q, heightScale ) {

                super();
                this.type = 'TorusKnotGeometry';

                this.parameters = {
                        radius: radius,
                        tube: tube,
                        tubularSegments: tubularSegments,
                        radialSegments: radialSegments,
                        p: p,
                        q: q
                };

                if ( heightScale !== undefined ) console.warn( 'THREE.TorusKnotGeometry: heightScale has been deprecated. Use .scale( x, y, z ) instead.' );

                this.fromBufferGeometry( new TorusKnotBufferGeometry( radius, tube, tubularSegments, radialSegments, p, q ) );
                this.mergeVertices();

        }

}

class TubeBufferGeometry extends BufferGeometry {

        constructor( path, tubularSegments = 64, radius = 1, radialSegments = 8, closed = false ) {

                super();
                this.type = 'TubeBufferGeometry';

                this.parameters = {
                        path: path,
                        tubularSegments: tubularSegments,
                        radius: radius,
                        radialSegments: radialSegments,
                        closed: closed
                };

                const frames = path.computeFrenetFrames( tubularSegments, closed );

                // expose internals

                this.tangents = frames.tangents;
                this.normals = frames.normals;
                this.binormals = frames.binormals;

                // helper variables

                const vertex = new Vector3();
                const normal = new Vector3();
                const uv = new Vector2();
                let P = new Vector3();

                // buffer

                const vertices = [];
                const normals = [];
                const uvs = [];
                const indices = [];

                // create buffer data

                generateBufferData();

                // build geometry

                this.setIndex( indices );
                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
                this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

                // functions

                function generateBufferData() {

                        for ( let i = 0; i < tubularSegments; i ++ ) {

                                generateSegment( i );

                        }

                        // if the geometry is not closed, generate the last row of vertices and normals
                        // at the regular position on the given path
                        //
                        // if the geometry is closed, duplicate the first row of vertices and normals (uvs will differ)

                        generateSegment( ( closed === false ) ? tubularSegments : 0 );

                        // uvs are generated in a separate function.
                        // this makes it easy compute correct values for closed geometries

                        generateUVs();

                        // finally create faces

                        generateIndices();

                }

                function generateSegment( i ) {

                        // we use getPointAt to sample evenly distributed points from the given path

                        P = path.getPointAt( i / tubularSegments, P );

                        // retrieve corresponding normal and binormal

                        const N = frames.normals[ i ];
                        const B = frames.binormals[ i ];

                        // generate normals and vertices for the current segment

                        for ( let j = 0; j <= radialSegments; j ++ ) {

                                const v = j / radialSegments * Math.PI * 2;

                                const sin = Math.sin( v );
                                const cos = - Math.cos( v );

                                // normal

                                normal.x = ( cos * N.x + sin * B.x );
                                normal.y = ( cos * N.y + sin * B.y );
                                normal.z = ( cos * N.z + sin * B.z );
                                normal.normalize();

                                normals.push( normal.x, normal.y, normal.z );

                                // vertex

                                vertex.x = P.x + radius * normal.x;
                                vertex.y = P.y + radius * normal.y;
                                vertex.z = P.z + radius * normal.z;

                                vertices.push( vertex.x, vertex.y, vertex.z );

                        }

                }

                function generateIndices() {

                        for ( let j = 1; j <= tubularSegments; j ++ ) {

                                for ( let i = 1; i <= radialSegments; i ++ ) {

                                        const a = ( radialSegments + 1 ) * ( j - 1 ) + ( i - 1 );
                                        const b = ( radialSegments + 1 ) * j + ( i - 1 );
                                        const c = ( radialSegments + 1 ) * j + i;
                                        const d = ( radialSegments + 1 ) * ( j - 1 ) + i;

                                        // faces

                                        indices.push( a, b, d );
                                        indices.push( b, c, d );

                                }

                        }

                }

                function generateUVs() {

                        for ( let i = 0; i <= tubularSegments; i ++ ) {

                                for ( let j = 0; j <= radialSegments; j ++ ) {

                                        uv.x = i / tubularSegments;
                                        uv.y = j / radialSegments;

                                        uvs.push( uv.x, uv.y );

                                }

                        }

                }

        }
        toJSON() {

                const data = BufferGeometry.prototype.toJSON.call( this );

                data.path = this.parameters.path.toJSON();

                return data;

        }

}

class TubeGeometry extends Geometry {

        constructor( path, tubularSegments, radius, radialSegments, closed, taper ) {

                super();
                this.type = 'TubeGeometry';

                this.parameters = {
                        path: path,
                        tubularSegments: tubularSegments,
                        radius: radius,
                        radialSegments: radialSegments,
                        closed: closed
                };

                if ( taper !== undefined ) console.warn( 'THREE.TubeGeometry: taper has been removed.' );

                const bufferGeometry = new TubeBufferGeometry( path, tubularSegments, radius, radialSegments, closed );

                // expose internals

                this.tangents = bufferGeometry.tangents;
                this.normals = bufferGeometry.normals;
                this.binormals = bufferGeometry.binormals;

                // create geometry

                this.fromBufferGeometry( bufferGeometry );
                this.mergeVertices();

        }

}

class WireframeGeometry extends BufferGeometry {

        constructor( geometry ) {

                super();
                this.type = 'WireframeGeometry';

                // buffer

                const vertices = [];

                // helper variables

                const edge = [ 0, 0 ], edges = {};
                const keys = [ 'a', 'b', 'c' ];

                // different logic for Geometry and BufferGeometry

                if ( geometry && geometry.isGeometry ) {

                        // create a data structure that contains all edges without duplicates

                        const faces = geometry.faces;

                        for ( let i = 0, l = faces.length; i < l; i ++ ) {

                                const face = faces[ i ];

                                for ( let j = 0; j < 3; j ++ ) {

                                        const edge1 = face[ keys[ j ] ];
                                        const edge2 = face[ keys[ ( j + 1 ) % 3 ] ];
                                        edge[ 0 ] = Math.min( edge1, edge2 ); // sorting prevents duplicates
                                        edge[ 1 ] = Math.max( edge1, edge2 );

                                        const key = edge[ 0 ] + ',' + edge[ 1 ];

                                        if ( edges[ key ] === undefined ) {

                                                edges[ key ] = { index1: edge[ 0 ], index2: edge[ 1 ] };

                                        }

                                }

                        }

                        // generate vertices

                        for ( const key in edges ) {

                                const e = edges[ key ];

                                let vertex = geometry.vertices[ e.index1 ];
                                vertices.push( vertex.x, vertex.y, vertex.z );

                                vertex = geometry.vertices[ e.index2 ];
                                vertices.push( vertex.x, vertex.y, vertex.z );

                        }

                } else if ( geometry && geometry.isBufferGeometry ) {

                        const vertex = new Vector3();

                        if ( geometry.index !== null ) {

                                // indexed BufferGeometry

                                const position = geometry.attributes.position;
                                const indices = geometry.index;
                                let groups = geometry.groups;

                                if ( groups.length === 0 ) {

                                        groups = [ { start: 0, count: indices.count, materialIndex: 0 } ];

                                }

                                // create a data structure that contains all eges without duplicates

                                for ( let o = 0, ol = groups.length; o < ol; ++ o ) {

                                        const group = groups[ o ];

                                        const start = group.start;
                                        const count = group.count;

                                        for ( let i = start, l = ( start + count ); i < l; i += 3 ) {

                                                for ( let j = 0; j < 3; j ++ ) {

                                                        const edge1 = indices.getX( i + j );
                                                        const edge2 = indices.getX( i + ( j + 1 ) % 3 );
                                                        edge[ 0 ] = Math.min( edge1, edge2 ); // sorting prevents duplicates
                                                        edge[ 1 ] = Math.max( edge1, edge2 );

                                                        const key = edge[ 0 ] + ',' + edge[ 1 ];

                                                        if ( edges[ key ] === undefined ) {

                                                                edges[ key ] = { index1: edge[ 0 ], index2: edge[ 1 ] };

                                                        }

                                                }

                                        }

                                }

                                // generate vertices

                                for ( const key in edges ) {

                                        const e = edges[ key ];

                                        vertex.fromBufferAttribute( position, e.index1 );
                                        vertices.push( vertex.x, vertex.y, vertex.z );

                                        vertex.fromBufferAttribute( position, e.index2 );
                                        vertices.push( vertex.x, vertex.y, vertex.z );

                                }

                        } else {

                                // non-indexed BufferGeometry

                                const position = geometry.attributes.position;

                                for ( let i = 0, l = ( position.count / 3 ); i < l; i ++ ) {

                                        for ( let j = 0; j < 3; j ++ ) {

                                                // three edges per triangle, an edge is represented as (index1, index2)
                                                // e.g. the first triangle has the following edges: (0,1),(1,2),(2,0)

                                                const index1 = 3 * i + j;
                                                vertex.fromBufferAttribute( position, index1 );
                                                vertices.push( vertex.x, vertex.y, vertex.z );

                                                const index2 = 3 * i + ( ( j + 1 ) % 3 );
                                                vertex.fromBufferAttribute( position, index2 );
                                                vertices.push( vertex.x, vertex.y, vertex.z );

                                        }

                                }

                        }

                }

                // build geometry

                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

        }

}

var Geometries = /*#__PURE__*/Object.freeze({
        __proto__: null,
        BoxGeometry: BoxGeometry,
        BoxBufferGeometry: BoxBufferGeometry,
        CircleGeometry: CircleGeometry,
        CircleBufferGeometry: CircleBufferGeometry,
        ConeGeometry: ConeGeometry,
        ConeBufferGeometry: ConeBufferGeometry,
        CylinderGeometry: CylinderGeometry,
        CylinderBufferGeometry: CylinderBufferGeometry,
        DodecahedronGeometry: DodecahedronGeometry,
        DodecahedronBufferGeometry: DodecahedronBufferGeometry,
        EdgesGeometry: EdgesGeometry,
        ExtrudeGeometry: ExtrudeGeometry,
        ExtrudeBufferGeometry: ExtrudeBufferGeometry,
        IcosahedronGeometry: IcosahedronGeometry,
        IcosahedronBufferGeometry: IcosahedronBufferGeometry,
        LatheGeometry: LatheGeometry,
        LatheBufferGeometry: LatheBufferGeometry,
        OctahedronGeometry: OctahedronGeometry,
        OctahedronBufferGeometry: OctahedronBufferGeometry,
        ParametricGeometry: ParametricGeometry,
        ParametricBufferGeometry: ParametricBufferGeometry,
        PlaneGeometry: PlaneGeometry,
        PlaneBufferGeometry: PlaneBufferGeometry,
        PolyhedronGeometry: PolyhedronGeometry,
        PolyhedronBufferGeometry: PolyhedronBufferGeometry,
        RingGeometry: RingGeometry,
        RingBufferGeometry: RingBufferGeometry,
        ShapeGeometry: ShapeGeometry,
        ShapeBufferGeometry: ShapeBufferGeometry,
        SphereGeometry: SphereGeometry,
        SphereBufferGeometry: SphereBufferGeometry,
        TetrahedronGeometry: TetrahedronGeometry,
        TetrahedronBufferGeometry: TetrahedronBufferGeometry,
        TextGeometry: TextGeometry,
        TextBufferGeometry: TextBufferGeometry,
        TorusGeometry: TorusGeometry,
        TorusBufferGeometry: TorusBufferGeometry,
        TorusKnotGeometry: TorusKnotGeometry,
        TorusKnotBufferGeometry: TorusKnotBufferGeometry,
        TubeGeometry: TubeGeometry,
        TubeBufferGeometry: TubeBufferGeometry,
        WireframeGeometry: WireframeGeometry
});

/**
 * parameters = {
 *  color: <THREE.Color>
 * }
 */

function ShadowMaterial( parameters ) {

        Material.call( this );

        this.type = 'ShadowMaterial';

        this.color = new Color( 0x000000 );
        this.transparent = true;

        this.setValues( parameters );

}

ShadowMaterial.prototype = Object.create( Material.prototype );
ShadowMaterial.prototype.constructor = ShadowMaterial;

ShadowMaterial.prototype.isShadowMaterial = true;

ShadowMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.color.copy( source.color );

        return this;

};

function RawShaderMaterial( parameters ) {

        ShaderMaterial.call( this, parameters );

        this.type = 'RawShaderMaterial';

}

RawShaderMaterial.prototype = Object.create( ShaderMaterial.prototype );
RawShaderMaterial.prototype.constructor = RawShaderMaterial;

RawShaderMaterial.prototype.isRawShaderMaterial = true;

/**
 * parameters = {
 *  color: <hex>,
 *  roughness: <float>,
 *  metalness: <float>,
 *  opacity: <float>,
 *
 *  map: new THREE.Texture( <Image> ),
 *
 *  lightMap: new THREE.Texture( <Image> ),
 *  lightMapIntensity: <float>
 *
 *  aoMap: new THREE.Texture( <Image> ),
 *  aoMapIntensity: <float>
 *
 *  emissive: <hex>,
 *  emissiveIntensity: <float>
 *  emissiveMap: new THREE.Texture( <Image> ),
 *
 *  bumpMap: new THREE.Texture( <Image> ),
 *  bumpScale: <float>,
 *
 *  normalMap: new THREE.Texture( <Image> ),
 *  normalMapType: THREE.TangentSpaceNormalMap,
 *  normalScale: <Vector2>,
 *
 *  displacementMap: new THREE.Texture( <Image> ),
 *  displacementScale: <float>,
 *  displacementBias: <float>,
 *
 *  roughnessMap: new THREE.Texture( <Image> ),
 *
 *  metalnessMap: new THREE.Texture( <Image> ),
 *
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
 *  envMapIntensity: <float>
 *
 *  refractionRatio: <float>,
 *
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>,
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>,
 *  morphNormals: <bool>
 * }
 */

function MeshStandardMaterial( parameters ) {

        Material.call( this );

        this.defines = { 'STANDARD': '' };

        this.type = 'MeshStandardMaterial';

        this.color = new Color( 0xffffff ); // diffuse
        this.roughness = 1.0;
        this.metalness = 0.0;

        this.map = null;

        this.lightMap = null;
        this.lightMapIntensity = 1.0;

        this.aoMap = null;
        this.aoMapIntensity = 1.0;

        this.emissive = new Color( 0x000000 );
        this.emissiveIntensity = 1.0;
        this.emissiveMap = null;

        this.bumpMap = null;
        this.bumpScale = 1;

        this.normalMap = null;
        this.normalMapType = TangentSpaceNormalMap;
        this.normalScale = new Vector2( 1, 1 );

        this.displacementMap = null;
        this.displacementScale = 1;
        this.displacementBias = 0;

        this.roughnessMap = null;

        this.metalnessMap = null;

        this.alphaMap = null;

        this.envMap = null;
        this.envMapIntensity = 1.0;

        this.refractionRatio = 0.98;

        this.wireframe = false;
        this.wireframeLinewidth = 1;
        this.wireframeLinecap = 'round';
        this.wireframeLinejoin = 'round';

        this.skinning = false;
        this.morphTargets = false;
        this.morphNormals = false;

        this.vertexTangents = false;

        this.setValues( parameters );

}

MeshStandardMaterial.prototype = Object.create( Material.prototype );
MeshStandardMaterial.prototype.constructor = MeshStandardMaterial;

MeshStandardMaterial.prototype.isMeshStandardMaterial = true;

MeshStandardMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.defines = { 'STANDARD': '' };

        this.color.copy( source.color );
        this.roughness = source.roughness;
        this.metalness = source.metalness;

        this.map = source.map;

        this.lightMap = source.lightMap;
        this.lightMapIntensity = source.lightMapIntensity;

        this.aoMap = source.aoMap;
        this.aoMapIntensity = source.aoMapIntensity;

        this.emissive.copy( source.emissive );
        this.emissiveMap = source.emissiveMap;
        this.emissiveIntensity = source.emissiveIntensity;

        this.bumpMap = source.bumpMap;
        this.bumpScale = source.bumpScale;

        this.normalMap = source.normalMap;
        this.normalMapType = source.normalMapType;
        this.normalScale.copy( source.normalScale );

        this.displacementMap = source.displacementMap;
        this.displacementScale = source.displacementScale;
        this.displacementBias = source.displacementBias;

        this.roughnessMap = source.roughnessMap;

        this.metalnessMap = source.metalnessMap;

        this.alphaMap = source.alphaMap;

        this.envMap = source.envMap;
        this.envMapIntensity = source.envMapIntensity;

        this.refractionRatio = source.refractionRatio;

        this.wireframe = source.wireframe;
        this.wireframeLinewidth = source.wireframeLinewidth;
        this.wireframeLinecap = source.wireframeLinecap;
        this.wireframeLinejoin = source.wireframeLinejoin;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;
        this.morphNormals = source.morphNormals;

        this.vertexTangents = source.vertexTangents;

        return this;

};

/**
 * parameters = {
 *  clearcoat: <float>,
 *  clearcoatMap: new THREE.Texture( <Image> ),
 *  clearcoatRoughness: <float>,
 *  clearcoatRoughnessMap: new THREE.Texture( <Image> ),
 *  clearcoatNormalScale: <Vector2>,
 *  clearcoatNormalMap: new THREE.Texture( <Image> ),
 *
 *  reflectivity: <float>,
 *  ior: <float>,
 *
 *  sheen: <Color>,
 *
 *  transmission: <float>,
 *  transmissionMap: new THREE.Texture( <Image> )
 * }
 */

function MeshPhysicalMaterial( parameters ) {

        MeshStandardMaterial.call( this );

        this.defines = {

                'STANDARD': '',
                'PHYSICAL': ''

        };

        this.type = 'MeshPhysicalMaterial';

        this.clearcoat = 0.0;
        this.clearcoatMap = null;
        this.clearcoatRoughness = 0.0;
        this.clearcoatRoughnessMap = null;
        this.clearcoatNormalScale = new Vector2( 1, 1 );
        this.clearcoatNormalMap = null;

        this.reflectivity = 0.5; // maps to F0 = 0.04

        Object.defineProperty( this, 'ior', {
                get: function () {

                        return ( 1 + 0.4 * this.reflectivity ) / ( 1 - 0.4 * this.reflectivity );

                },
                set: function ( ior ) {

                        this.reflectivity = MathUtils.clamp( 2.5 * ( ior - 1 ) / ( ior + 1 ), 0, 1 );

                }
        } );

        this.sheen = null; // null will disable sheen bsdf

        this.transmission = 0.0;
        this.transmissionMap = null;

        this.setValues( parameters );

}

MeshPhysicalMaterial.prototype = Object.create( MeshStandardMaterial.prototype );
MeshPhysicalMaterial.prototype.constructor = MeshPhysicalMaterial;

MeshPhysicalMaterial.prototype.isMeshPhysicalMaterial = true;

MeshPhysicalMaterial.prototype.copy = function ( source ) {

        MeshStandardMaterial.prototype.copy.call( this, source );

        this.defines = {

                'STANDARD': '',
                'PHYSICAL': ''

        };

        this.clearcoat = source.clearcoat;
        this.clearcoatMap = source.clearcoatMap;
        this.clearcoatRoughness = source.clearcoatRoughness;
        this.clearcoatRoughnessMap = source.clearcoatRoughnessMap;
        this.clearcoatNormalMap = source.clearcoatNormalMap;
        this.clearcoatNormalScale.copy( source.clearcoatNormalScale );

        this.reflectivity = source.reflectivity;

        if ( source.sheen ) {

                this.sheen = ( this.sheen || new Color() ).copy( source.sheen );

        } else {

                this.sheen = null;

        }

        this.transmission = source.transmission;
        this.transmissionMap = source.transmissionMap;

        return this;

};

/**
 * parameters = {
 *  color: <hex>,
 *  specular: <hex>,
 *  shininess: <float>,
 *  opacity: <float>,
 *
 *  map: new THREE.Texture( <Image> ),
 *
 *  lightMap: new THREE.Texture( <Image> ),
 *  lightMapIntensity: <float>
 *
 *  aoMap: new THREE.Texture( <Image> ),
 *  aoMapIntensity: <float>
 *
 *  emissive: <hex>,
 *  emissiveIntensity: <float>
 *  emissiveMap: new THREE.Texture( <Image> ),
 *
 *  bumpMap: new THREE.Texture( <Image> ),
 *  bumpScale: <float>,
 *
 *  normalMap: new THREE.Texture( <Image> ),
 *  normalMapType: THREE.TangentSpaceNormalMap,
 *  normalScale: <Vector2>,
 *
 *  displacementMap: new THREE.Texture( <Image> ),
 *  displacementScale: <float>,
 *  displacementBias: <float>,
 *
 *  specularMap: new THREE.Texture( <Image> ),
 *
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
 *  combine: THREE.MultiplyOperation,
 *  reflectivity: <float>,
 *  refractionRatio: <float>,
 *
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>,
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>,
 *  morphNormals: <bool>
 * }
 */

function MeshPhongMaterial( parameters ) {

        Material.call( this );

        this.type = 'MeshPhongMaterial';

        this.color = new Color( 0xffffff ); // diffuse
        this.specular = new Color( 0x111111 );
        this.shininess = 30;

        this.map = null;

        this.lightMap = null;
        this.lightMapIntensity = 1.0;

        this.aoMap = null;
        this.aoMapIntensity = 1.0;

        this.emissive = new Color( 0x000000 );
        this.emissiveIntensity = 1.0;
        this.emissiveMap = null;

        this.bumpMap = null;
        this.bumpScale = 1;

        this.normalMap = null;
        this.normalMapType = TangentSpaceNormalMap;
        this.normalScale = new Vector2( 1, 1 );

        this.displacementMap = null;
        this.displacementScale = 1;
        this.displacementBias = 0;

        this.specularMap = null;

        this.alphaMap = null;

        this.envMap = null;
        this.combine = MultiplyOperation;
        this.reflectivity = 1;
        this.refractionRatio = 0.98;

        this.wireframe = false;
        this.wireframeLinewidth = 1;
        this.wireframeLinecap = 'round';
        this.wireframeLinejoin = 'round';

        this.skinning = false;
        this.morphTargets = false;
        this.morphNormals = false;

        this.setValues( parameters );

}

MeshPhongMaterial.prototype = Object.create( Material.prototype );
MeshPhongMaterial.prototype.constructor = MeshPhongMaterial;

MeshPhongMaterial.prototype.isMeshPhongMaterial = true;

MeshPhongMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.color.copy( source.color );
        this.specular.copy( source.specular );
        this.shininess = source.shininess;

        this.map = source.map;

        this.lightMap = source.lightMap;
        this.lightMapIntensity = source.lightMapIntensity;

        this.aoMap = source.aoMap;
        this.aoMapIntensity = source.aoMapIntensity;

        this.emissive.copy( source.emissive );
        this.emissiveMap = source.emissiveMap;
        this.emissiveIntensity = source.emissiveIntensity;

        this.bumpMap = source.bumpMap;
        this.bumpScale = source.bumpScale;

        this.normalMap = source.normalMap;
        this.normalMapType = source.normalMapType;
        this.normalScale.copy( source.normalScale );

        this.displacementMap = source.displacementMap;
        this.displacementScale = source.displacementScale;
        this.displacementBias = source.displacementBias;

        this.specularMap = source.specularMap;

        this.alphaMap = source.alphaMap;

        this.envMap = source.envMap;
        this.combine = source.combine;
        this.reflectivity = source.reflectivity;
        this.refractionRatio = source.refractionRatio;

        this.wireframe = source.wireframe;
        this.wireframeLinewidth = source.wireframeLinewidth;
        this.wireframeLinecap = source.wireframeLinecap;
        this.wireframeLinejoin = source.wireframeLinejoin;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;
        this.morphNormals = source.morphNormals;

        return this;

};

/**
 * parameters = {
 *  color: <hex>,
 *
 *  map: new THREE.Texture( <Image> ),
 *  gradientMap: new THREE.Texture( <Image> ),
 *
 *  lightMap: new THREE.Texture( <Image> ),
 *  lightMapIntensity: <float>
 *
 *  aoMap: new THREE.Texture( <Image> ),
 *  aoMapIntensity: <float>
 *
 *  emissive: <hex>,
 *  emissiveIntensity: <float>
 *  emissiveMap: new THREE.Texture( <Image> ),
 *
 *  bumpMap: new THREE.Texture( <Image> ),
 *  bumpScale: <float>,
 *
 *  normalMap: new THREE.Texture( <Image> ),
 *  normalMapType: THREE.TangentSpaceNormalMap,
 *  normalScale: <Vector2>,
 *
 *  displacementMap: new THREE.Texture( <Image> ),
 *  displacementScale: <float>,
 *  displacementBias: <float>,
 *
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>,
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>,
 *  morphNormals: <bool>
 * }
 */

function MeshToonMaterial( parameters ) {

        Material.call( this );

        this.defines = { 'TOON': '' };

        this.type = 'MeshToonMaterial';

        this.color = new Color( 0xffffff );

        this.map = null;
        this.gradientMap = null;

        this.lightMap = null;
        this.lightMapIntensity = 1.0;

        this.aoMap = null;
        this.aoMapIntensity = 1.0;

        this.emissive = new Color( 0x000000 );
        this.emissiveIntensity = 1.0;
        this.emissiveMap = null;

        this.bumpMap = null;
        this.bumpScale = 1;

        this.normalMap = null;
        this.normalMapType = TangentSpaceNormalMap;
        this.normalScale = new Vector2( 1, 1 );

        this.displacementMap = null;
        this.displacementScale = 1;
        this.displacementBias = 0;

        this.alphaMap = null;

        this.wireframe = false;
        this.wireframeLinewidth = 1;
        this.wireframeLinecap = 'round';
        this.wireframeLinejoin = 'round';

        this.skinning = false;
        this.morphTargets = false;
        this.morphNormals = false;

        this.setValues( parameters );

}

MeshToonMaterial.prototype = Object.create( Material.prototype );
MeshToonMaterial.prototype.constructor = MeshToonMaterial;

MeshToonMaterial.prototype.isMeshToonMaterial = true;

MeshToonMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.color.copy( source.color );

        this.map = source.map;
        this.gradientMap = source.gradientMap;

        this.lightMap = source.lightMap;
        this.lightMapIntensity = source.lightMapIntensity;

        this.aoMap = source.aoMap;
        this.aoMapIntensity = source.aoMapIntensity;

        this.emissive.copy( source.emissive );
        this.emissiveMap = source.emissiveMap;
        this.emissiveIntensity = source.emissiveIntensity;

        this.bumpMap = source.bumpMap;
        this.bumpScale = source.bumpScale;

        this.normalMap = source.normalMap;
        this.normalMapType = source.normalMapType;
        this.normalScale.copy( source.normalScale );

        this.displacementMap = source.displacementMap;
        this.displacementScale = source.displacementScale;
        this.displacementBias = source.displacementBias;

        this.alphaMap = source.alphaMap;

        this.wireframe = source.wireframe;
        this.wireframeLinewidth = source.wireframeLinewidth;
        this.wireframeLinecap = source.wireframeLinecap;
        this.wireframeLinejoin = source.wireframeLinejoin;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;
        this.morphNormals = source.morphNormals;

        return this;

};

/**
 * parameters = {
 *  opacity: <float>,
 *
 *  bumpMap: new THREE.Texture( <Image> ),
 *  bumpScale: <float>,
 *
 *  normalMap: new THREE.Texture( <Image> ),
 *  normalMapType: THREE.TangentSpaceNormalMap,
 *  normalScale: <Vector2>,
 *
 *  displacementMap: new THREE.Texture( <Image> ),
 *  displacementScale: <float>,
 *  displacementBias: <float>,
 *
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>,
 *  morphNormals: <bool>
 * }
 */

function MeshNormalMaterial( parameters ) {

        Material.call( this );

        this.type = 'MeshNormalMaterial';

        this.bumpMap = null;
        this.bumpScale = 1;

        this.normalMap = null;
        this.normalMapType = TangentSpaceNormalMap;
        this.normalScale = new Vector2( 1, 1 );

        this.displacementMap = null;
        this.displacementScale = 1;
        this.displacementBias = 0;

        this.wireframe = false;
        this.wireframeLinewidth = 1;

        this.fog = false;

        this.skinning = false;
        this.morphTargets = false;
        this.morphNormals = false;

        this.setValues( parameters );

}

MeshNormalMaterial.prototype = Object.create( Material.prototype );
MeshNormalMaterial.prototype.constructor = MeshNormalMaterial;

MeshNormalMaterial.prototype.isMeshNormalMaterial = true;

MeshNormalMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.bumpMap = source.bumpMap;
        this.bumpScale = source.bumpScale;

        this.normalMap = source.normalMap;
        this.normalMapType = source.normalMapType;
        this.normalScale.copy( source.normalScale );

        this.displacementMap = source.displacementMap;
        this.displacementScale = source.displacementScale;
        this.displacementBias = source.displacementBias;

        this.wireframe = source.wireframe;
        this.wireframeLinewidth = source.wireframeLinewidth;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;
        this.morphNormals = source.morphNormals;

        return this;

};

/**
 * parameters = {
 *  color: <hex>,
 *  opacity: <float>,
 *
 *  map: new THREE.Texture( <Image> ),
 *
 *  lightMap: new THREE.Texture( <Image> ),
 *  lightMapIntensity: <float>
 *
 *  aoMap: new THREE.Texture( <Image> ),
 *  aoMapIntensity: <float>
 *
 *  emissive: <hex>,
 *  emissiveIntensity: <float>
 *  emissiveMap: new THREE.Texture( <Image> ),
 *
 *  specularMap: new THREE.Texture( <Image> ),
 *
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
 *  combine: THREE.Multiply,
 *  reflectivity: <float>,
 *  refractionRatio: <float>,
 *
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>,
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>,
 *  morphNormals: <bool>
 * }
 */

function MeshLambertMaterial( parameters ) {

        Material.call( this );

        this.type = 'MeshLambertMaterial';

        this.color = new Color( 0xffffff ); // diffuse

        this.map = null;

        this.lightMap = null;
        this.lightMapIntensity = 1.0;

        this.aoMap = null;
        this.aoMapIntensity = 1.0;

        this.emissive = new Color( 0x000000 );
        this.emissiveIntensity = 1.0;
        this.emissiveMap = null;

        this.specularMap = null;

        this.alphaMap = null;

        this.envMap = null;
        this.combine = MultiplyOperation;
        this.reflectivity = 1;
        this.refractionRatio = 0.98;

        this.wireframe = false;
        this.wireframeLinewidth = 1;
        this.wireframeLinecap = 'round';
        this.wireframeLinejoin = 'round';

        this.skinning = false;
        this.morphTargets = false;
        this.morphNormals = false;

        this.setValues( parameters );

}

MeshLambertMaterial.prototype = Object.create( Material.prototype );
MeshLambertMaterial.prototype.constructor = MeshLambertMaterial;

MeshLambertMaterial.prototype.isMeshLambertMaterial = true;

MeshLambertMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.color.copy( source.color );

        this.map = source.map;

        this.lightMap = source.lightMap;
        this.lightMapIntensity = source.lightMapIntensity;

        this.aoMap = source.aoMap;
        this.aoMapIntensity = source.aoMapIntensity;

        this.emissive.copy( source.emissive );
        this.emissiveMap = source.emissiveMap;
        this.emissiveIntensity = source.emissiveIntensity;

        this.specularMap = source.specularMap;

        this.alphaMap = source.alphaMap;

        this.envMap = source.envMap;
        this.combine = source.combine;
        this.reflectivity = source.reflectivity;
        this.refractionRatio = source.refractionRatio;

        this.wireframe = source.wireframe;
        this.wireframeLinewidth = source.wireframeLinewidth;
        this.wireframeLinecap = source.wireframeLinecap;
        this.wireframeLinejoin = source.wireframeLinejoin;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;
        this.morphNormals = source.morphNormals;

        return this;

};

/**
 * parameters = {
 *  color: <hex>,
 *  opacity: <float>,
 *
 *  matcap: new THREE.Texture( <Image> ),
 *
 *  map: new THREE.Texture( <Image> ),
 *
 *  bumpMap: new THREE.Texture( <Image> ),
 *  bumpScale: <float>,
 *
 *  normalMap: new THREE.Texture( <Image> ),
 *  normalMapType: THREE.TangentSpaceNormalMap,
 *  normalScale: <Vector2>,
 *
 *  displacementMap: new THREE.Texture( <Image> ),
 *  displacementScale: <float>,
 *  displacementBias: <float>,
 *
 *  alphaMap: new THREE.Texture( <Image> ),
 *
 *  skinning: <bool>,
 *  morphTargets: <bool>,
 *  morphNormals: <bool>
 * }
 */

function MeshMatcapMaterial( parameters ) {

        Material.call( this );

        this.defines = { 'MATCAP': '' };

        this.type = 'MeshMatcapMaterial';

        this.color = new Color( 0xffffff ); // diffuse

        this.matcap = null;

        this.map = null;

        this.bumpMap = null;
        this.bumpScale = 1;

        this.normalMap = null;
        this.normalMapType = TangentSpaceNormalMap;
        this.normalScale = new Vector2( 1, 1 );

        this.displacementMap = null;
        this.displacementScale = 1;
        this.displacementBias = 0;

        this.alphaMap = null;

        this.skinning = false;
        this.morphTargets = false;
        this.morphNormals = false;

        this.setValues( parameters );

}

MeshMatcapMaterial.prototype = Object.create( Material.prototype );
MeshMatcapMaterial.prototype.constructor = MeshMatcapMaterial;

MeshMatcapMaterial.prototype.isMeshMatcapMaterial = true;

MeshMatcapMaterial.prototype.copy = function ( source ) {

        Material.prototype.copy.call( this, source );

        this.defines = { 'MATCAP': '' };

        this.color.copy( source.color );

        this.matcap = source.matcap;

        this.map = source.map;

        this.bumpMap = source.bumpMap;
        this.bumpScale = source.bumpScale;

        this.normalMap = source.normalMap;
        this.normalMapType = source.normalMapType;
        this.normalScale.copy( source.normalScale );

        this.displacementMap = source.displacementMap;
        this.displacementScale = source.displacementScale;
        this.displacementBias = source.displacementBias;

        this.alphaMap = source.alphaMap;

        this.skinning = source.skinning;
        this.morphTargets = source.morphTargets;
        this.morphNormals = source.morphNormals;

        return this;

};

/**
 * parameters = {
 *  color: <hex>,
 *  opacity: <float>,
 *
 *  linewidth: <float>,
 *
 *  scale: <float>,
 *  dashSize: <float>,
 *  gapSize: <float>
 * }
 */

function LineDashedMaterial( parameters ) {

        LineBasicMaterial.call( this );

        this.type = 'LineDashedMaterial';

        this.scale = 1;
        this.dashSize = 3;
        this.gapSize = 1;

        this.setValues( parameters );

}

LineDashedMaterial.prototype = Object.create( LineBasicMaterial.prototype );
LineDashedMaterial.prototype.constructor = LineDashedMaterial;

LineDashedMaterial.prototype.isLineDashedMaterial = true;

LineDashedMaterial.prototype.copy = function ( source ) {

        LineBasicMaterial.prototype.copy.call( this, source );

        this.scale = source.scale;
        this.dashSize = source.dashSize;
        this.gapSize = source.gapSize;

        return this;

};

var Materials = /*#__PURE__*/Object.freeze({
        __proto__: null,
        ShadowMaterial: ShadowMaterial,
        SpriteMaterial: SpriteMaterial,
        RawShaderMaterial: RawShaderMaterial,
        ShaderMaterial: ShaderMaterial,
        PointsMaterial: PointsMaterial,
        MeshPhysicalMaterial: MeshPhysicalMaterial,
        MeshStandardMaterial: MeshStandardMaterial,
        MeshPhongMaterial: MeshPhongMaterial,
        MeshToonMaterial: MeshToonMaterial,
        MeshNormalMaterial: MeshNormalMaterial,
        MeshLambertMaterial: MeshLambertMaterial,
        MeshDepthMaterial: MeshDepthMaterial,
        MeshDistanceMaterial: MeshDistanceMaterial,
        MeshBasicMaterial: MeshBasicMaterial,
        MeshMatcapMaterial: MeshMatcapMaterial,
        LineDashedMaterial: LineDashedMaterial,
        LineBasicMaterial: LineBasicMaterial,
        Material: Material
});

const AnimationUtils = {

        // same as Array.prototype.slice, but also works on typed arrays
        arraySlice: function ( array, from, to ) {

                if ( AnimationUtils.isTypedArray( array ) ) {

                        // in ios9 array.subarray(from, undefined) will return empty array
                        // but array.subarray(from) or array.subarray(from, len) is correct
                        return new array.constructor( array.subarray( from, to !== undefined ? to : array.length ) );

                }

                return array.slice( from, to );

        },

        // converts an array to a specific type
        convertArray: function ( array, type, forceClone ) {

                if ( ! array || // let 'undefined' and 'null' pass
                        ! forceClone && array.constructor === type ) return array;

                if ( typeof type.BYTES_PER_ELEMENT === 'number' ) {

                        return new type( array ); // create typed array

                }

                return Array.prototype.slice.call( array ); // create Array

        },

        isTypedArray: function ( object ) {

                return ArrayBuffer.isView( object ) &&
                        ! ( object instanceof DataView );

        },

        // returns an array by which times and values can be sorted
        getKeyframeOrder: function ( times ) {

                function compareTime( i, j ) {

                        return times[ i ] - times[ j ];

                }

                const n = times.length;
                const result = new Array( n );
                for ( let i = 0; i !== n; ++ i ) result[ i ] = i;

                result.sort( compareTime );

                return result;

        },

        // uses the array previously returned by 'getKeyframeOrder' to sort data
        sortedArray: function ( values, stride, order ) {

                const nValues = values.length;
                const result = new values.constructor( nValues );

                for ( let i = 0, dstOffset = 0; dstOffset !== nValues; ++ i ) {

                        const srcOffset = order[ i ] * stride;

                        for ( let j = 0; j !== stride; ++ j ) {

                                result[ dstOffset ++ ] = values[ srcOffset + j ];

                        }

                }

                return result;

        },

        // function for parsing AOS keyframe formats
        flattenJSON: function ( jsonKeys, times, values, valuePropertyName ) {

                let i = 1, key = jsonKeys[ 0 ];

                while ( key !== undefined && key[ valuePropertyName ] === undefined ) {

                        key = jsonKeys[ i ++ ];

                }

                if ( key === undefined ) return; // no data

                let value = key[ valuePropertyName ];
                if ( value === undefined ) return; // no data

                if ( Array.isArray( value ) ) {

                        do {

                                value = key[ valuePropertyName ];

                                if ( value !== undefined ) {

                                        times.push( key.time );
                                        values.push.apply( values, value ); // push all elements

                                }

                                key = jsonKeys[ i ++ ];

                        } while ( key !== undefined );

                } else if ( value.toArray !== undefined ) {

                        // ...assume THREE.Math-ish

                        do {

                                value = key[ valuePropertyName ];

                                if ( value !== undefined ) {

                                        times.push( key.time );
                                        value.toArray( values, values.length );

                                }

                                key = jsonKeys[ i ++ ];

                        } while ( key !== undefined );

                } else {

                        // otherwise push as-is

                        do {

                                value = key[ valuePropertyName ];

                                if ( value !== undefined ) {

                                        times.push( key.time );
                                        values.push( value );

                                }

                                key = jsonKeys[ i ++ ];

                        } while ( key !== undefined );

                }

        },

        subclip: function ( sourceClip, name, startFrame, endFrame, fps = 30 ) {

                const clip = sourceClip.clone();

                clip.name = name;

                const tracks = [];

                for ( let i = 0; i < clip.tracks.length; ++ i ) {

                        const track = clip.tracks[ i ];
                        const valueSize = track.getValueSize();

                        const times = [];
                        const values = [];

                        for ( let j = 0; j < track.times.length; ++ j ) {

                                const frame = track.times[ j ] * fps;

                                if ( frame < startFrame || frame >= endFrame ) continue;

                                times.push( track.times[ j ] );

                                for ( let k = 0; k < valueSize; ++ k ) {

                                        values.push( track.values[ j * valueSize + k ] );

                                }

                        }

                        if ( times.length === 0 ) continue;

                        track.times = AnimationUtils.convertArray( times, track.times.constructor );
                        track.values = AnimationUtils.convertArray( values, track.values.constructor );

                        tracks.push( track );

                }

                clip.tracks = tracks;

                // find minimum .times value across all tracks in the trimmed clip

                let minStartTime = Infinity;

                for ( let i = 0; i < clip.tracks.length; ++ i ) {

                        if ( minStartTime > clip.tracks[ i ].times[ 0 ] ) {

                                minStartTime = clip.tracks[ i ].times[ 0 ];

                        }

                }

                // shift all tracks such that clip begins at t=0

                for ( let i = 0; i < clip.tracks.length; ++ i ) {

                        clip.tracks[ i ].shift( - 1 * minStartTime );

                }

                clip.resetDuration();

                return clip;

        },

        makeClipAdditive: function ( targetClip, referenceFrame = 0, referenceClip = targetClip, fps = 30 ) {

                if ( fps <= 0 ) fps = 30;

                const numTracks = referenceClip.tracks.length;
                const referenceTime = referenceFrame / fps;

                // Make each track's values relative to the values at the reference frame
                for ( let i = 0; i < numTracks; ++ i ) {

                        const referenceTrack = referenceClip.tracks[ i ];
                        const referenceTrackType = referenceTrack.ValueTypeName;

                        // Skip this track if it's non-numeric
                        if ( referenceTrackType === 'bool' || referenceTrackType === 'string' ) continue;

                        // Find the track in the target clip whose name and type matches the reference track
                        const targetTrack = targetClip.tracks.find( function ( track ) {

                                return track.name === referenceTrack.name
                                        && track.ValueTypeName === referenceTrackType;

                        } );

                        if ( targetTrack === undefined ) continue;

                        let referenceOffset = 0;
                        const referenceValueSize = referenceTrack.getValueSize();

                        if ( referenceTrack.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline ) {

                                referenceOffset = referenceValueSize / 3;

                        }

                        let targetOffset = 0;
                        const targetValueSize = targetTrack.getValueSize();

                        if ( targetTrack.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline ) {

                                targetOffset = targetValueSize / 3;

                        }

                        const lastIndex = referenceTrack.times.length - 1;
                        let referenceValue;

                        // Find the value to subtract out of the track
                        if ( referenceTime <= referenceTrack.times[ 0 ] ) {

                                // Reference frame is earlier than the first keyframe, so just use the first keyframe
                                const startIndex = referenceOffset;
                                const endIndex = referenceValueSize - referenceOffset;
                                referenceValue = AnimationUtils.arraySlice( referenceTrack.values, startIndex, endIndex );

                        } else if ( referenceTime >= referenceTrack.times[ lastIndex ] ) {

                                // Reference frame is after the last keyframe, so just use the last keyframe
                                const startIndex = lastIndex * referenceValueSize + referenceOffset;
                                const endIndex = startIndex + referenceValueSize - referenceOffset;
                                referenceValue = AnimationUtils.arraySlice( referenceTrack.values, startIndex, endIndex );

                        } else {

                                // Interpolate to the reference value
                                const interpolant = referenceTrack.createInterpolant();
                                const startIndex = referenceOffset;
                                const endIndex = referenceValueSize - referenceOffset;
                                interpolant.evaluate( referenceTime );
                                referenceValue = AnimationUtils.arraySlice( interpolant.resultBuffer, startIndex, endIndex );

                        }

                        // Conjugate the quaternion
                        if ( referenceTrackType === 'quaternion' ) {

                                const referenceQuat = new Quaternion().fromArray( referenceValue ).normalize().conjugate();
                                referenceQuat.toArray( referenceValue );

                        }

                        // Subtract the reference value from all of the track values

                        const numTimes = targetTrack.times.length;
                        for ( let j = 0; j < numTimes; ++ j ) {

                                const valueStart = j * targetValueSize + targetOffset;

                                if ( referenceTrackType === 'quaternion' ) {

                                        // Multiply the conjugate for quaternion track types
                                        Quaternion.multiplyQuaternionsFlat(
                                                targetTrack.values,
                                                valueStart,
                                                referenceValue,
                                                0,
                                                targetTrack.values,
                                                valueStart
                                        );

                                } else {

                                        const valueEnd = targetValueSize - targetOffset * 2;

                                        // Subtract each value for all other numeric track types
                                        for ( let k = 0; k < valueEnd; ++ k ) {

                                                targetTrack.values[ valueStart + k ] -= referenceValue[ k ];

                                        }

                                }

                        }

                }

                targetClip.blendMode = AdditiveAnimationBlendMode;

                return targetClip;

        }

};

/**
 * Abstract base class of interpolants over parametric samples.
 *
 * The parameter domain is one dimensional, typically the time or a path
 * along a curve defined by the data.
 *
 * The sample values can have any dimensionality and derived classes may
 * apply special interpretations to the data.
 *
 * This class provides the interval seek in a Template Method, deferring
 * the actual interpolation to derived classes.
 *
 * Time complexity is O(1) for linear access crossing at most two points
 * and O(log N) for random access, where N is the number of positions.
 *
 * References:
 *
 *              http://www.oodesign.com/template-method-pattern.html
 *
 */

function Interpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

        this.parameterPositions = parameterPositions;
        this._cachedIndex = 0;

        this.resultBuffer = resultBuffer !== undefined ?
                resultBuffer : new sampleValues.constructor( sampleSize );
        this.sampleValues = sampleValues;
        this.valueSize = sampleSize;

}

Object.assign( Interpolant.prototype, {

        evaluate: function ( t ) {

                const pp = this.parameterPositions;
                let i1 = this._cachedIndex,
                        t1 = pp[ i1 ],
                        t0 = pp[ i1 - 1 ];

                validate_interval: {

                        seek: {

                                let right;

                                linear_scan: {

                                        //- See http://jsperf.com/comparison-to-undefined/3
                                        //- slower code:
                                        //-
                                        //-                             if ( t >= t1 || t1 === undefined ) {
                                        forward_scan: if ( ! ( t < t1 ) ) {

                                                for ( let giveUpAt = i1 + 2; ; ) {

                                                        if ( t1 === undefined ) {

                                                                if ( t < t0 ) break forward_scan;

                                                                // after end

                                                                i1 = pp.length;
                                                                this._cachedIndex = i1;
                                                                return this.afterEnd_( i1 - 1, t, t0 );

                                                        }

                                                        if ( i1 === giveUpAt ) break; // this loop

                                                        t0 = t1;
                                                        t1 = pp[ ++ i1 ];

                                                        if ( t < t1 ) {

                                                                // we have arrived at the sought interval
                                                                break seek;

                                                        }

                                                }

                                                // prepare binary search on the right side of the index
                                                right = pp.length;
                                                break linear_scan;

                                        }

                                        //- slower code:
                                        //-                                     if ( t < t0 || t0 === undefined ) {
                                        if ( ! ( t >= t0 ) ) {

                                                // looping?

                                                const t1global = pp[ 1 ];

                                                if ( t < t1global ) {

                                                        i1 = 2; // + 1, using the scan for the details
                                                        t0 = t1global;

                                                }

                                                // linear reverse scan

                                                for ( let giveUpAt = i1 - 2; ; ) {

                                                        if ( t0 === undefined ) {

                                                                // before start

                                                                this._cachedIndex = 0;
                                                                return this.beforeStart_( 0, t, t1 );

                                                        }

                                                        if ( i1 === giveUpAt ) break; // this loop

                                                        t1 = t0;
                                                        t0 = pp[ -- i1 - 1 ];

                                                        if ( t >= t0 ) {

                                                                // we have arrived at the sought interval
                                                                break seek;

                                                        }

                                                }

                                                // prepare binary search on the left side of the index
                                                right = i1;
                                                i1 = 0;
                                                break linear_scan;

                                        }

                                        // the interval is valid

                                        break validate_interval;

                                } // linear scan

                                // binary search

                                while ( i1 < right ) {

                                        const mid = ( i1 + right ) >>> 1;

                                        if ( t < pp[ mid ] ) {

                                                right = mid;

                                        } else {

                                                i1 = mid + 1;

                                        }

                                }

                                t1 = pp[ i1 ];
                                t0 = pp[ i1 - 1 ];

                                // check boundary cases, again

                                if ( t0 === undefined ) {

                                        this._cachedIndex = 0;
                                        return this.beforeStart_( 0, t, t1 );

                                }

                                if ( t1 === undefined ) {

                                        i1 = pp.length;
                                        this._cachedIndex = i1;
                                        return this.afterEnd_( i1 - 1, t0, t );

                                }

                        } // seek

                        this._cachedIndex = i1;

                        this.intervalChanged_( i1, t0, t1 );

                } // validate_interval

                return this.interpolate_( i1, t0, t, t1 );

        },

        settings: null, // optional, subclass-specific settings structure
        // Note: The indirection allows central control of many interpolants.

        // --- Protected interface

        DefaultSettings_: {},

        getSettings_: function () {

                return this.settings || this.DefaultSettings_;

        },

        copySampleValue_: function ( index ) {

                // copies a sample value to the result buffer

                const result = this.resultBuffer,
                        values = this.sampleValues,
                        stride = this.valueSize,
                        offset = index * stride;

                for ( let i = 0; i !== stride; ++ i ) {

                        result[ i ] = values[ offset + i ];

                }

                return result;

        },

        // Template methods for derived classes:

        interpolate_: function ( /* i1, t0, t, t1 */ ) {

                throw new Error( 'call to abstract method' );
                // implementations shall return this.resultBuffer

        },

        intervalChanged_: function ( /* i1, t0, t1 */ ) {

                // empty

        }

} );

// DECLARE ALIAS AFTER assign prototype
Object.assign( Interpolant.prototype, {

        //( 0, t, t0 ), returns this.resultBuffer
        beforeStart_: Interpolant.prototype.copySampleValue_,

        //( N-1, tN-1, t ), returns this.resultBuffer
        afterEnd_: Interpolant.prototype.copySampleValue_,

} );

/**
 * Fast and simple cubic spline interpolant.
 *
 * It was derived from a Hermitian construction setting the first derivative
 * at each sample position to the linear slope between neighboring positions
 * over their parameter interval.
 */

function CubicInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

        Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

        this._weightPrev = - 0;
        this._offsetPrev = - 0;
        this._weightNext = - 0;
        this._offsetNext = - 0;

}

CubicInterpolant.prototype = Object.assign( Object.create( Interpolant.prototype ), {

        constructor: CubicInterpolant,

        DefaultSettings_: {

                endingStart: ZeroCurvatureEnding,
                endingEnd: ZeroCurvatureEnding

        },

        intervalChanged_: function ( i1, t0, t1 ) {

                const pp = this.parameterPositions;
                let iPrev = i1 - 2,
                        iNext = i1 + 1,

                        tPrev = pp[ iPrev ],
                        tNext = pp[ iNext ];

                if ( tPrev === undefined ) {

                        switch ( this.getSettings_().endingStart ) {

                                case ZeroSlopeEnding:

                                        // f'(t0) = 0
                                        iPrev = i1;
                                        tPrev = 2 * t0 - t1;

                                        break;

                                case WrapAroundEnding:

                                        // use the other end of the curve
                                        iPrev = pp.length - 2;
                                        tPrev = t0 + pp[ iPrev ] - pp[ iPrev + 1 ];

                                        break;

                                default: // ZeroCurvatureEnding

                                        // f''(t0) = 0 a.k.a. Natural Spline
                                        iPrev = i1;
                                        tPrev = t1;

                        }

                }

                if ( tNext === undefined ) {

                        switch ( this.getSettings_().endingEnd ) {

                                case ZeroSlopeEnding:

                                        // f'(tN) = 0
                                        iNext = i1;
                                        tNext = 2 * t1 - t0;

                                        break;

                                case WrapAroundEnding:

                                        // use the other end of the curve
                                        iNext = 1;
                                        tNext = t1 + pp[ 1 ] - pp[ 0 ];

                                        break;

                                default: // ZeroCurvatureEnding

                                        // f''(tN) = 0, a.k.a. Natural Spline
                                        iNext = i1 - 1;
                                        tNext = t0;

                        }

                }

                const halfDt = ( t1 - t0 ) * 0.5,
                        stride = this.valueSize;

                this._weightPrev = halfDt / ( t0 - tPrev );
                this._weightNext = halfDt / ( tNext - t1 );
                this._offsetPrev = iPrev * stride;
                this._offsetNext = iNext * stride;

        },

        interpolate_: function ( i1, t0, t, t1 ) {

                const result = this.resultBuffer,
                        values = this.sampleValues,
                        stride = this.valueSize,

                        o1 = i1 * stride,               o0 = o1 - stride,
                        oP = this._offsetPrev,  oN = this._offsetNext,
                        wP = this._weightPrev,  wN = this._weightNext,

                        p = ( t - t0 ) / ( t1 - t0 ),
                        pp = p * p,
                        ppp = pp * p;

                // evaluate polynomials

                const sP = - wP * ppp + 2 * wP * pp - wP * p;
                const s0 = ( 1 + wP ) * ppp + ( - 1.5 - 2 * wP ) * pp + ( - 0.5 + wP ) * p + 1;
                const s1 = ( - 1 - wN ) * ppp + ( 1.5 + wN ) * pp + 0.5 * p;
                const sN = wN * ppp - wN * pp;

                // combine data linearly

                for ( let i = 0; i !== stride; ++ i ) {

                        result[ i ] =
                                        sP * values[ oP + i ] +
                                        s0 * values[ o0 + i ] +
                                        s1 * values[ o1 + i ] +
                                        sN * values[ oN + i ];

                }

                return result;

        }

} );

function LinearInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

        Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

}

LinearInterpolant.prototype = Object.assign( Object.create( Interpolant.prototype ), {

        constructor: LinearInterpolant,

        interpolate_: function ( i1, t0, t, t1 ) {

                const result = this.resultBuffer,
                        values = this.sampleValues,
                        stride = this.valueSize,

                        offset1 = i1 * stride,
                        offset0 = offset1 - stride,

                        weight1 = ( t - t0 ) / ( t1 - t0 ),
                        weight0 = 1 - weight1;

                for ( let i = 0; i !== stride; ++ i ) {

                        result[ i ] =
                                        values[ offset0 + i ] * weight0 +
                                        values[ offset1 + i ] * weight1;

                }

                return result;

        }

} );

/**
 *
 * Interpolant that evaluates to the sample value at the position preceeding
 * the parameter.
 */

function DiscreteInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

        Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

}

DiscreteInterpolant.prototype = Object.assign( Object.create( Interpolant.prototype ), {

        constructor: DiscreteInterpolant,

        interpolate_: function ( i1 /*, t0, t, t1 */ ) {

                return this.copySampleValue_( i1 - 1 );

        }

} );

function KeyframeTrack( name, times, values, interpolation ) {

        if ( name === undefined ) throw new Error( 'THREE.KeyframeTrack: track name is undefined' );
        if ( times === undefined || times.length === 0 ) throw new Error( 'THREE.KeyframeTrack: no keyframes in track named ' + name );

        this.name = name;

        this.times = AnimationUtils.convertArray( times, this.TimeBufferType );
        this.values = AnimationUtils.convertArray( values, this.ValueBufferType );

        this.setInterpolation( interpolation || this.DefaultInterpolation );

}

// Static methods

Object.assign( KeyframeTrack, {

        // Serialization (in static context, because of constructor invocation
        // and automatic invocation of .toJSON):

        toJSON: function ( track ) {

                const trackType = track.constructor;

                let json;

                // derived classes can define a static toJSON method
                if ( trackType.toJSON !== undefined ) {

                        json = trackType.toJSON( track );

                } else {

                        // by default, we assume the data can be serialized as-is
                        json = {

                                'name': track.name,
                                'times': AnimationUtils.convertArray( track.times, Array ),
                                'values': AnimationUtils.convertArray( track.values, Array )

                        };

                        const interpolation = track.getInterpolation();

                        if ( interpolation !== track.DefaultInterpolation ) {

                                json.interpolation = interpolation;

                        }

                }

                json.type = track.ValueTypeName; // mandatory

                return json;

        }

} );

Object.assign( KeyframeTrack.prototype, {

        constructor: KeyframeTrack,

        TimeBufferType: Float32Array,

        ValueBufferType: Float32Array,

        DefaultInterpolation: InterpolateLinear,

        InterpolantFactoryMethodDiscrete: function ( result ) {

                return new DiscreteInterpolant( this.times, this.values, this.getValueSize(), result );

        },

        InterpolantFactoryMethodLinear: function ( result ) {

                return new LinearInterpolant( this.times, this.values, this.getValueSize(), result );

        },

        InterpolantFactoryMethodSmooth: function ( result ) {

                return new CubicInterpolant( this.times, this.values, this.getValueSize(), result );

        },

        setInterpolation: function ( interpolation ) {

                let factoryMethod;

                switch ( interpolation ) {

                        case InterpolateDiscrete:

                                factoryMethod = this.InterpolantFactoryMethodDiscrete;

                                break;

                        case InterpolateLinear:

                                factoryMethod = this.InterpolantFactoryMethodLinear;

                                break;

                        case InterpolateSmooth:

                                factoryMethod = this.InterpolantFactoryMethodSmooth;

                                break;

                }

                if ( factoryMethod === undefined ) {

                        const message = "unsupported interpolation for " +
                                this.ValueTypeName + " keyframe track named " + this.name;

                        if ( this.createInterpolant === undefined ) {

                                // fall back to default, unless the default itself is messed up
                                if ( interpolation !== this.DefaultInterpolation ) {

                                        this.setInterpolation( this.DefaultInterpolation );

                                } else {

                                        throw new Error( message ); // fatal, in this case

                                }

                        }

                        console.warn( 'THREE.KeyframeTrack:', message );
                        return this;

                }

                this.createInterpolant = factoryMethod;

                return this;

        },

        getInterpolation: function () {

                switch ( this.createInterpolant ) {

                        case this.InterpolantFactoryMethodDiscrete:

                                return InterpolateDiscrete;

                        case this.InterpolantFactoryMethodLinear:

                                return InterpolateLinear;

                        case this.InterpolantFactoryMethodSmooth:

                                return InterpolateSmooth;

                }

        },

        getValueSize: function () {

                return this.values.length / this.times.length;

        },

        // move all keyframes either forwards or backwards in time
        shift: function ( timeOffset ) {

                if ( timeOffset !== 0.0 ) {

                        const times = this.times;

                        for ( let i = 0, n = times.length; i !== n; ++ i ) {

                                times[ i ] += timeOffset;

                        }

                }

                return this;

        },

        // scale all keyframe times by a factor (useful for frame <-> seconds conversions)
        scale: function ( timeScale ) {

                if ( timeScale !== 1.0 ) {

                        const times = this.times;

                        for ( let i = 0, n = times.length; i !== n; ++ i ) {

                                times[ i ] *= timeScale;

                        }

                }

                return this;

        },

        // removes keyframes before and after animation without changing any values within the range [startTime, endTime].
        // IMPORTANT: We do not shift around keys to the start of the track time, because for interpolated keys this will change their values
        trim: function ( startTime, endTime ) {

                const times = this.times,
                        nKeys = times.length;

                let from = 0,
                        to = nKeys - 1;

                while ( from !== nKeys && times[ from ] < startTime ) {

                        ++ from;

                }

                while ( to !== - 1 && times[ to ] > endTime ) {

                        -- to;

                }

                ++ to; // inclusive -> exclusive bound

                if ( from !== 0 || to !== nKeys ) {

                        // empty tracks are forbidden, so keep at least one keyframe
                        if ( from >= to ) {

                                to = Math.max( to, 1 );
                                from = to - 1;

                        }

                        const stride = this.getValueSize();
                        this.times = AnimationUtils.arraySlice( times, from, to );
                        this.values = AnimationUtils.arraySlice( this.values, from * stride, to * stride );

                }

                return this;

        },

        // ensure we do not get a GarbageInGarbageOut situation, make sure tracks are at least minimally viable
        validate: function () {

                let valid = true;

                const valueSize = this.getValueSize();
                if ( valueSize - Math.floor( valueSize ) !== 0 ) {

                        console.error( 'THREE.KeyframeTrack: Invalid value size in track.', this );
                        valid = false;

                }

                const times = this.times,
                        values = this.values,

                        nKeys = times.length;

                if ( nKeys === 0 ) {

                        console.error( 'THREE.KeyframeTrack: Track is empty.', this );
                        valid = false;

                }

                let prevTime = null;

                for ( let i = 0; i !== nKeys; i ++ ) {

                        const currTime = times[ i ];

                        if ( typeof currTime === 'number' && isNaN( currTime ) ) {

                                console.error( 'THREE.KeyframeTrack: Time is not a valid number.', this, i, currTime );
                                valid = false;
                                break;

                        }

                        if ( prevTime !== null && prevTime > currTime ) {

                                console.error( 'THREE.KeyframeTrack: Out of order keys.', this, i, currTime, prevTime );
                                valid = false;
                                break;

                        }

                        prevTime = currTime;

                }

                if ( values !== undefined ) {

                        if ( AnimationUtils.isTypedArray( values ) ) {

                                for ( let i = 0, n = values.length; i !== n; ++ i ) {

                                        const value = values[ i ];

                                        if ( isNaN( value ) ) {

                                                console.error( 'THREE.KeyframeTrack: Value is not a valid number.', this, i, value );
                                                valid = false;
                                                break;

                                        }

                                }

                        }

                }

                return valid;

        },

        // removes equivalent sequential keys as common in morph target sequences
        // (0,0,0,0,1,1,1,0,0,0,0,0,0,0) --> (0,0,1,1,0,0)
        optimize: function () {

                // times or values may be shared with other tracks, so overwriting is unsafe
                const times = AnimationUtils.arraySlice( this.times ),
                        values = AnimationUtils.arraySlice( this.values ),
                        stride = this.getValueSize(),

                        smoothInterpolation = this.getInterpolation() === InterpolateSmooth,

                        lastIndex = times.length - 1;

                let writeIndex = 1;

                for ( let i = 1; i < lastIndex; ++ i ) {

                        let keep = false;

                        const time = times[ i ];
                        const timeNext = times[ i + 1 ];

                        // remove adjacent keyframes scheduled at the same time

                        if ( time !== timeNext && ( i !== 1 || time !== time[ 0 ] ) ) {

                                if ( ! smoothInterpolation ) {

                                        // remove unnecessary keyframes same as their neighbors

                                        const offset = i * stride,
                                                offsetP = offset - stride,
                                                offsetN = offset + stride;

                                        for ( let j = 0; j !== stride; ++ j ) {

                                                const value = values[ offset + j ];

                                                if ( value !== values[ offsetP + j ] ||
                                                        value !== values[ offsetN + j ] ) {

                                                        keep = true;
                                                        break;

                                                }

                                        }

                                } else {

                                        keep = true;

                                }

                        }

                        // in-place compaction

                        if ( keep ) {

                                if ( i !== writeIndex ) {

                                        times[ writeIndex ] = times[ i ];

                                        const readOffset = i * stride,
                                                writeOffset = writeIndex * stride;

                                        for ( let j = 0; j !== stride; ++ j ) {

                                                values[ writeOffset + j ] = values[ readOffset + j ];

                                        }

                                }

                                ++ writeIndex;

                        }

                }

                // flush last keyframe (compaction looks ahead)

                if ( lastIndex > 0 ) {

                        times[ writeIndex ] = times[ lastIndex ];

                        for ( let readOffset = lastIndex * stride, writeOffset = writeIndex * stride, j = 0; j !== stride; ++ j ) {

                                values[ writeOffset + j ] = values[ readOffset + j ];

                        }

                        ++ writeIndex;

                }

                if ( writeIndex !== times.length ) {

                        this.times = AnimationUtils.arraySlice( times, 0, writeIndex );
                        this.values = AnimationUtils.arraySlice( values, 0, writeIndex * stride );

                } else {

                        this.times = times;
                        this.values = values;

                }

                return this;

        },

        clone: function () {

                const times = AnimationUtils.arraySlice( this.times, 0 );
                const values = AnimationUtils.arraySlice( this.values, 0 );

                const TypedKeyframeTrack = this.constructor;
                const track = new TypedKeyframeTrack( this.name, times, values );

                // Interpolant argument to constructor is not saved, so copy the factory method directly.
                track.createInterpolant = this.createInterpolant;

                return track;

        }

} );

/**
 * A Track of Boolean keyframe values.
 */

function BooleanKeyframeTrack( name, times, values ) {

        KeyframeTrack.call( this, name, times, values );

}

BooleanKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

        constructor: BooleanKeyframeTrack,

        ValueTypeName: 'bool',
        ValueBufferType: Array,

        DefaultInterpolation: InterpolateDiscrete,

        InterpolantFactoryMethodLinear: undefined,
        InterpolantFactoryMethodSmooth: undefined

        // Note: Actually this track could have a optimized / compressed
        // representation of a single value and a custom interpolant that
        // computes "firstValue ^ isOdd( index )".

} );

/**
 * A Track of keyframe values that represent color.
 */

function ColorKeyframeTrack( name, times, values, interpolation ) {

        KeyframeTrack.call( this, name, times, values, interpolation );

}

ColorKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

        constructor: ColorKeyframeTrack,

        ValueTypeName: 'color'

        // ValueBufferType is inherited

        // DefaultInterpolation is inherited

        // Note: Very basic implementation and nothing special yet.
        // However, this is the place for color space parameterization.

} );

/**
 * A Track of numeric keyframe values.
 */

function NumberKeyframeTrack( name, times, values, interpolation ) {

        KeyframeTrack.call( this, name, times, values, interpolation );

}

NumberKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

        constructor: NumberKeyframeTrack,

        ValueTypeName: 'number'

        // ValueBufferType is inherited

        // DefaultInterpolation is inherited

} );

/**
 * Spherical linear unit quaternion interpolant.
 */

function QuaternionLinearInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

        Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

}

QuaternionLinearInterpolant.prototype = Object.assign( Object.create( Interpolant.prototype ), {

        constructor: QuaternionLinearInterpolant,

        interpolate_: function ( i1, t0, t, t1 ) {

                const result = this.resultBuffer,
                        values = this.sampleValues,
                        stride = this.valueSize,

                        alpha = ( t - t0 ) / ( t1 - t0 );

                let offset = i1 * stride;

                for ( let end = offset + stride; offset !== end; offset += 4 ) {

                        Quaternion.slerpFlat( result, 0, values, offset - stride, values, offset, alpha );

                }

                return result;

        }

} );

/**
 * A Track of quaternion keyframe values.
 */

function QuaternionKeyframeTrack( name, times, values, interpolation ) {

        KeyframeTrack.call( this, name, times, values, interpolation );

}

QuaternionKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

        constructor: QuaternionKeyframeTrack,

        ValueTypeName: 'quaternion',

        // ValueBufferType is inherited

        DefaultInterpolation: InterpolateLinear,

        InterpolantFactoryMethodLinear: function ( result ) {

                return new QuaternionLinearInterpolant( this.times, this.values, this.getValueSize(), result );

        },

        InterpolantFactoryMethodSmooth: undefined // not yet implemented

} );

/**
 * A Track that interpolates Strings
 */

function StringKeyframeTrack( name, times, values, interpolation ) {

        KeyframeTrack.call( this, name, times, values, interpolation );

}

StringKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

        constructor: StringKeyframeTrack,

        ValueTypeName: 'string',
        ValueBufferType: Array,

        DefaultInterpolation: InterpolateDiscrete,

        InterpolantFactoryMethodLinear: undefined,

        InterpolantFactoryMethodSmooth: undefined

} );

/**
 * A Track of vectored keyframe values.
 */

function VectorKeyframeTrack( name, times, values, interpolation ) {

        KeyframeTrack.call( this, name, times, values, interpolation );

}

VectorKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

        constructor: VectorKeyframeTrack,

        ValueTypeName: 'vector'

        // ValueBufferType is inherited

        // DefaultInterpolation is inherited

} );

function AnimationClip( name, duration, tracks, blendMode ) {

        this.name = name;
        this.tracks = tracks;
        this.duration = ( duration !== undefined ) ? duration : - 1;
        this.blendMode = ( blendMode !== undefined ) ? blendMode : NormalAnimationBlendMode;

        this.uuid = MathUtils.generateUUID();

        // this means it should figure out its duration by scanning the tracks
        if ( this.duration < 0 ) {

                this.resetDuration();

        }

}

function getTrackTypeForValueTypeName( typeName ) {

        switch ( typeName.toLowerCase() ) {

                case 'scalar':
                case 'double':
                case 'float':
                case 'number':
                case 'integer':

                        return NumberKeyframeTrack;

                case 'vector':
                case 'vector2':
                case 'vector3':
                case 'vector4':

                        return VectorKeyframeTrack;

                case 'color':

                        return ColorKeyframeTrack;

                case 'quaternion':

                        return QuaternionKeyframeTrack;

                case 'bool':
                case 'boolean':

                        return BooleanKeyframeTrack;

                case 'string':

                        return StringKeyframeTrack;

        }

        throw new Error( 'THREE.KeyframeTrack: Unsupported typeName: ' + typeName );

}

function parseKeyframeTrack( json ) {

        if ( json.type === undefined ) {

                throw new Error( 'THREE.KeyframeTrack: track type undefined, can not parse' );

        }

        const trackType = getTrackTypeForValueTypeName( json.type );

        if ( json.times === undefined ) {

                const times = [], values = [];

                AnimationUtils.flattenJSON( json.keys, times, values, 'value' );

                json.times = times;
                json.values = values;

        }

        // derived classes can define a static parse method
        if ( trackType.parse !== undefined ) {

                return trackType.parse( json );

        } else {

                // by default, we assume a constructor compatible with the base
                return new trackType( json.name, json.times, json.values, json.interpolation );

        }

}

Object.assign( AnimationClip, {

        parse: function ( json ) {

                const tracks = [],
                        jsonTracks = json.tracks,
                        frameTime = 1.0 / ( json.fps || 1.0 );

                for ( let i = 0, n = jsonTracks.length; i !== n; ++ i ) {

                        tracks.push( parseKeyframeTrack( jsonTracks[ i ] ).scale( frameTime ) );

                }

                const clip = new AnimationClip( json.name, json.duration, tracks, json.blendMode );
                clip.uuid = json.uuid;

                return clip;

        },

        toJSON: function ( clip ) {

                const tracks = [],
                        clipTracks = clip.tracks;

                const json = {

                        'name': clip.name,
                        'duration': clip.duration,
                        'tracks': tracks,
                        'uuid': clip.uuid,
                        'blendMode': clip.blendMode

                };

                for ( let i = 0, n = clipTracks.length; i !== n; ++ i ) {

                        tracks.push( KeyframeTrack.toJSON( clipTracks[ i ] ) );

                }

                return json;

        },

        CreateFromMorphTargetSequence: function ( name, morphTargetSequence, fps, noLoop ) {

                const numMorphTargets = morphTargetSequence.length;
                const tracks = [];

                for ( let i = 0; i < numMorphTargets; i ++ ) {

                        let times = [];
                        let values = [];

                        times.push(
                                ( i + numMorphTargets - 1 ) % numMorphTargets,
                                i,
                                ( i + 1 ) % numMorphTargets );

                        values.push( 0, 1, 0 );

                        const order = AnimationUtils.getKeyframeOrder( times );
                        times = AnimationUtils.sortedArray( times, 1, order );
                        values = AnimationUtils.sortedArray( values, 1, order );

                        // if there is a key at the first frame, duplicate it as the
                        // last frame as well for perfect loop.
                        if ( ! noLoop && times[ 0 ] === 0 ) {

                                times.push( numMorphTargets );
                                values.push( values[ 0 ] );

                        }

                        tracks.push(
                                new NumberKeyframeTrack(
                                        '.morphTargetInfluences[' + morphTargetSequence[ i ].name + ']',
                                        times, values
                                ).scale( 1.0 / fps ) );

                }

                return new AnimationClip( name, - 1, tracks );

        },

        findByName: function ( objectOrClipArray, name ) {

                let clipArray = objectOrClipArray;

                if ( ! Array.isArray( objectOrClipArray ) ) {

                        const o = objectOrClipArray;
                        clipArray = o.geometry && o.geometry.animations || o.animations;

                }

                for ( let i = 0; i < clipArray.length; i ++ ) {

                        if ( clipArray[ i ].name === name ) {

                                return clipArray[ i ];

                        }

                }

                return null;

        },

        CreateClipsFromMorphTargetSequences: function ( morphTargets, fps, noLoop ) {

                const animationToMorphTargets = {};

                // tested with https://regex101.com/ on trick sequences
                // such flamingo_flyA_003, flamingo_run1_003, crdeath0059
                const pattern = /^([\w-]*?)([\d]+)$/;

                // sort morph target names into animation groups based
                // patterns like Walk_001, Walk_002, Run_001, Run_002
                for ( let i = 0, il = morphTargets.length; i < il; i ++ ) {

                        const morphTarget = morphTargets[ i ];
                        const parts = morphTarget.name.match( pattern );

                        if ( parts && parts.length > 1 ) {

                                const name = parts[ 1 ];

                                let animationMorphTargets = animationToMorphTargets[ name ];

                                if ( ! animationMorphTargets ) {

                                        animationToMorphTargets[ name ] = animationMorphTargets = [];

                                }

                                animationMorphTargets.push( morphTarget );

                        }

                }

                const clips = [];

                for ( const name in animationToMorphTargets ) {

                        clips.push( AnimationClip.CreateFromMorphTargetSequence( name, animationToMorphTargets[ name ], fps, noLoop ) );

                }

                return clips;

        },

        // parse the animation.hierarchy format
        parseAnimation: function ( animation, bones ) {

                if ( ! animation ) {

                        console.error( 'THREE.AnimationClip: No animation in JSONLoader data.' );
                        return null;

                }

                const addNonemptyTrack = function ( trackType, trackName, animationKeys, propertyName, destTracks ) {

                        // only return track if there are actually keys.
                        if ( animationKeys.length !== 0 ) {

                                const times = [];
                                const values = [];

                                AnimationUtils.flattenJSON( animationKeys, times, values, propertyName );

                                // empty keys are filtered out, so check again
                                if ( times.length !== 0 ) {

                                        destTracks.push( new trackType( trackName, times, values ) );

                                }

                        }

                };

                const tracks = [];

                const clipName = animation.name || 'default';
                const fps = animation.fps || 30;
                const blendMode = animation.blendMode;

                // automatic length determination in AnimationClip.
                let duration = animation.length || - 1;

                const hierarchyTracks = animation.hierarchy || [];

                for ( let h = 0; h < hierarchyTracks.length; h ++ ) {

                        const animationKeys = hierarchyTracks[ h ].keys;

                        // skip empty tracks
                        if ( ! animationKeys || animationKeys.length === 0 ) continue;

                        // process morph targets
                        if ( animationKeys[ 0 ].morphTargets ) {

                                // figure out all morph targets used in this track
                                const morphTargetNames = {};

                                let k;

                                for ( k = 0; k < animationKeys.length; k ++ ) {

                                        if ( animationKeys[ k ].morphTargets ) {

                                                for ( let m = 0; m < animationKeys[ k ].morphTargets.length; m ++ ) {

                                                        morphTargetNames[ animationKeys[ k ].morphTargets[ m ] ] = - 1;

                                                }

                                        }

                                }

                                // create a track for each morph target with all zero
                                // morphTargetInfluences except for the keys in which
                                // the morphTarget is named.
                                for ( const morphTargetName in morphTargetNames ) {

                                        const times = [];
                                        const values = [];

                                        for ( let m = 0; m !== animationKeys[ k ].morphTargets.length; ++ m ) {

                                                const animationKey = animationKeys[ k ];

                                                times.push( animationKey.time );
                                                values.push( ( animationKey.morphTarget === morphTargetName ) ? 1 : 0 );

                                        }

                                        tracks.push( new NumberKeyframeTrack( '.morphTargetInfluence[' + morphTargetName + ']', times, values ) );

                                }

                                duration = morphTargetNames.length * ( fps || 1.0 );

                        } else {

                                // ...assume skeletal animation

                                const boneName = '.bones[' + bones[ h ].name + ']';

                                addNonemptyTrack(
                                        VectorKeyframeTrack, boneName + '.position',
                                        animationKeys, 'pos', tracks );

                                addNonemptyTrack(
                                        QuaternionKeyframeTrack, boneName + '.quaternion',
                                        animationKeys, 'rot', tracks );

                                addNonemptyTrack(
                                        VectorKeyframeTrack, boneName + '.scale',
                                        animationKeys, 'scl', tracks );

                        }

                }

                if ( tracks.length === 0 ) {

                        return null;

                }

                const clip = new AnimationClip( clipName, duration, tracks, blendMode );

                return clip;

        }

} );

Object.assign( AnimationClip.prototype, {

        resetDuration: function () {

                const tracks = this.tracks;
                let duration = 0;

                for ( let i = 0, n = tracks.length; i !== n; ++ i ) {

                        const track = this.tracks[ i ];

                        duration = Math.max( duration, track.times[ track.times.length - 1 ] );

                }

                this.duration = duration;

                return this;

        },

        trim: function () {

                for ( let i = 0; i < this.tracks.length; i ++ ) {

                        this.tracks[ i ].trim( 0, this.duration );

                }

                return this;

        },

        validate: function () {

                let valid = true;

                for ( let i = 0; i < this.tracks.length; i ++ ) {

                        valid = valid && this.tracks[ i ].validate();

                }

                return valid;

        },

        optimize: function () {

                for ( let i = 0; i < this.tracks.length; i ++ ) {

                        this.tracks[ i ].optimize();

                }

                return this;

        },

        clone: function () {

                const tracks = [];

                for ( let i = 0; i < this.tracks.length; i ++ ) {

                        tracks.push( this.tracks[ i ].clone() );

                }

                return new AnimationClip( this.name, this.duration, tracks, this.blendMode );

        },

        toJSON: function () {

                return AnimationClip.toJSON( this );

        }

} );

const Cache = {

        enabled: false,

        files: {},

        add: function ( key, file ) {

                if ( this.enabled === false ) return;

                // console.log( 'THREE.Cache', 'Adding key:', key );

                this.files[ key ] = file;

        },

        get: function ( key ) {

                if ( this.enabled === false ) return;

                // console.log( 'THREE.Cache', 'Checking key:', key );

                return this.files[ key ];

        },

        remove: function ( key ) {

                delete this.files[ key ];

        },

        clear: function () {

                this.files = {};

        }

};

function LoadingManager( onLoad, onProgress, onError ) {

        const scope = this;

        let isLoading = false;
        let itemsLoaded = 0;
        let itemsTotal = 0;
        let urlModifier = undefined;
        const handlers = [];

        // Refer to #5689 for the reason why we don't set .onStart
        // in the constructor

        this.onStart = undefined;
        this.onLoad = onLoad;
        this.onProgress = onProgress;
        this.onError = onError;

        this.itemStart = function ( url ) {

                itemsTotal ++;

                if ( isLoading === false ) {

                        if ( scope.onStart !== undefined ) {

                                scope.onStart( url, itemsLoaded, itemsTotal );

                        }

                }

                isLoading = true;

        };

        this.itemEnd = function ( url ) {

                itemsLoaded ++;

                if ( scope.onProgress !== undefined ) {

                        scope.onProgress( url, itemsLoaded, itemsTotal );

                }

                if ( itemsLoaded === itemsTotal ) {

                        isLoading = false;

                        if ( scope.onLoad !== undefined ) {

                                scope.onLoad();

                        }

                }

        };

        this.itemError = function ( url ) {

                if ( scope.onError !== undefined ) {

                        scope.onError( url );

                }

        };

        this.resolveURL = function ( url ) {

                if ( urlModifier ) {

                        return urlModifier( url );

                }

                return url;

        };

        this.setURLModifier = function ( transform ) {

                urlModifier = transform;

                return this;

        };

        this.addHandler = function ( regex, loader ) {

                handlers.push( regex, loader );

                return this;

        };

        this.removeHandler = function ( regex ) {

                const index = handlers.indexOf( regex );

                if ( index !== - 1 ) {

                        handlers.splice( index, 2 );

                }

                return this;

        };

        this.getHandler = function ( file ) {

                for ( let i = 0, l = handlers.length; i < l; i += 2 ) {

                        const regex = handlers[ i ];
                        const loader = handlers[ i + 1 ];

                        if ( regex.global ) regex.lastIndex = 0; // see #17920

                        if ( regex.test( file ) ) {

                                return loader;

                        }

                }

                return null;

        };

}

const DefaultLoadingManager = new LoadingManager();

function Loader( manager ) {

        this.manager = ( manager !== undefined ) ? manager : DefaultLoadingManager;

        this.crossOrigin = 'anonymous';
        this.withCredentials = false;
        this.path = '';
        this.resourcePath = '';
        this.requestHeader = {};

}

Object.assign( Loader.prototype, {

        load: function ( /* url, onLoad, onProgress, onError */ ) {},

        loadAsync: function ( url, onProgress ) {

                const scope = this;

                return new Promise( function ( resolve, reject ) {

                        scope.load( url, resolve, onProgress, reject );

                } );

        },

        parse: function ( /* data */ ) {},

        setCrossOrigin: function ( crossOrigin ) {

                this.crossOrigin = crossOrigin;
                return this;

        },

        setWithCredentials: function ( value ) {

                this.withCredentials = value;
                return this;

        },

        setPath: function ( path ) {

                this.path = path;
                return this;

        },

        setResourcePath: function ( resourcePath ) {

                this.resourcePath = resourcePath;
                return this;

        },

        setRequestHeader: function ( requestHeader ) {

                this.requestHeader = requestHeader;
                return this;

        }

} );

const loading = {};

function FileLoader( manager ) {

        Loader.call( this, manager );

}

FileLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: FileLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                if ( url === undefined ) url = '';

                if ( this.path !== undefined ) url = this.path + url;

                url = this.manager.resolveURL( url );

                const scope = this;

                const cached = Cache.get( url );

                if ( cached !== undefined ) {

                        scope.manager.itemStart( url );

                        setTimeout( function () {

                                if ( onLoad ) onLoad( cached );

                                scope.manager.itemEnd( url );

                        }, 0 );

                        return cached;

                }

                // Check if request is duplicate

                if ( loading[ url ] !== undefined ) {

                        loading[ url ].push( {

                                onLoad: onLoad,
                                onProgress: onProgress,
                                onError: onError

                        } );

                        return;

                }

                // Check for data: URI
                const dataUriRegex = /^data:(.*?)(;base64)?,(.*)$/;
                const dataUriRegexResult = url.match( dataUriRegex );
                let request;

                // Safari can not handle Data URIs through XMLHttpRequest so process manually
                if ( dataUriRegexResult ) {

                        const mimeType = dataUriRegexResult[ 1 ];
                        const isBase64 = !! dataUriRegexResult[ 2 ];

                        let data = dataUriRegexResult[ 3 ];
                        data = decodeURIComponent( data );

                        if ( isBase64 ) data = atob( data );

                        try {

                                let response;
                                const responseType = ( this.responseType || '' ).toLowerCase();

                                switch ( responseType ) {

                                        case 'arraybuffer':
                                        case 'blob':

                                                const view = new Uint8Array( data.length );

                                                for ( let i = 0; i < data.length; i ++ ) {

                                                        view[ i ] = data.charCodeAt( i );

                                                }

                                                if ( responseType === 'blob' ) {

                                                        response = new Blob( [ view.buffer ], { type: mimeType } );

                                                } else {

                                                        response = view.buffer;

                                                }

                                                break;

                                        case 'document':

                                                const parser = new DOMParser();
                                                response = parser.parseFromString( data, mimeType );

                                                break;

                                        case 'json':

                                                response = JSON.parse( data );

                                                break;

                                        default: // 'text' or other

                                                response = data;

                                                break;

                                }

                                // Wait for next browser tick like standard XMLHttpRequest event dispatching does
                                setTimeout( function () {

                                        if ( onLoad ) onLoad( response );

                                        scope.manager.itemEnd( url );

                                }, 0 );

                        } catch ( error ) {

                                // Wait for next browser tick like standard XMLHttpRequest event dispatching does
                                setTimeout( function () {

                                        if ( onError ) onError( error );

                                        scope.manager.itemError( url );
                                        scope.manager.itemEnd( url );

                                }, 0 );

                        }

                } else {

                        // Initialise array for duplicate requests

                        loading[ url ] = [];

                        loading[ url ].push( {

                                onLoad: onLoad,
                                onProgress: onProgress,
                                onError: onError

                        } );

                        request = new XMLHttpRequest();

                        request.open( 'GET', url, true );

                        request.addEventListener( 'load', function ( event ) {

                                const response = this.response;

                                const callbacks = loading[ url ];

                                delete loading[ url ];

                                if ( this.status === 200 || this.status === 0 ) {

                                        // Some browsers return HTTP Status 0 when using non-http protocol
                                        // e.g. 'file://' or 'data://'. Handle as success.

                                        if ( this.status === 0 ) console.warn( 'THREE.FileLoader: HTTP Status 0 received.' );

                                        // Add to cache only on HTTP success, so that we do not cache
                                        // error response bodies as proper responses to requests.
                                        Cache.add( url, response );

                                        for ( let i = 0, il = callbacks.length; i < il; i ++ ) {

                                                const callback = callbacks[ i ];
                                                if ( callback.onLoad ) callback.onLoad( response );

                                        }

                                        scope.manager.itemEnd( url );

                                } else {

                                        for ( let i = 0, il = callbacks.length; i < il; i ++ ) {

                                                const callback = callbacks[ i ];
                                                if ( callback.onError ) callback.onError( event );

                                        }

                                        scope.manager.itemError( url );
                                        scope.manager.itemEnd( url );

                                }

                        }, false );

                        request.addEventListener( 'progress', function ( event ) {

                                const callbacks = loading[ url ];

                                for ( let i = 0, il = callbacks.length; i < il; i ++ ) {

                                        const callback = callbacks[ i ];
                                        if ( callback.onProgress ) callback.onProgress( event );

                                }

                        }, false );

                        request.addEventListener( 'error', function ( event ) {

                                const callbacks = loading[ url ];

                                delete loading[ url ];

                                for ( let i = 0, il = callbacks.length; i < il; i ++ ) {

                                        const callback = callbacks[ i ];
                                        if ( callback.onError ) callback.onError( event );

                                }

                                scope.manager.itemError( url );
                                scope.manager.itemEnd( url );

                        }, false );

                        request.addEventListener( 'abort', function ( event ) {

                                const callbacks = loading[ url ];

                                delete loading[ url ];

                                for ( let i = 0, il = callbacks.length; i < il; i ++ ) {

                                        const callback = callbacks[ i ];
                                        if ( callback.onError ) callback.onError( event );

                                }

                                scope.manager.itemError( url );
                                scope.manager.itemEnd( url );

                        }, false );

                        if ( this.responseType !== undefined ) request.responseType = this.responseType;
                        if ( this.withCredentials !== undefined ) request.withCredentials = this.withCredentials;

                        if ( request.overrideMimeType ) request.overrideMimeType( this.mimeType !== undefined ? this.mimeType : 'text/plain' );

                        for ( const header in this.requestHeader ) {

                                request.setRequestHeader( header, this.requestHeader[ header ] );

                        }

                        request.send( null );

                }

                scope.manager.itemStart( url );

                return request;

        },

        setResponseType: function ( value ) {

                this.responseType = value;
                return this;

        },

        setMimeType: function ( value ) {

                this.mimeType = value;
                return this;

        }

} );

function AnimationLoader( manager ) {

        Loader.call( this, manager );

}

AnimationLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: AnimationLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                const scope = this;

                const loader = new FileLoader( scope.manager );
                loader.setPath( scope.path );
                loader.setRequestHeader( scope.requestHeader );
                loader.setWithCredentials( scope.withCredentials );
                loader.load( url, function ( text ) {

                        try {

                                onLoad( scope.parse( JSON.parse( text ) ) );

                        } catch ( e ) {

                                if ( onError ) {

                                        onError( e );

                                } else {

                                        console.error( e );

                                }

                                scope.manager.itemError( url );

                        }

                }, onProgress, onError );

        },

        parse: function ( json ) {

                const animations = [];

                for ( let i = 0; i < json.length; i ++ ) {

                        const clip = AnimationClip.parse( json[ i ] );

                        animations.push( clip );

                }

                return animations;

        }

} );

/**
 * Abstract Base class to block based textures loader (dds, pvr, ...)
 *
 * Sub classes have to implement the parse() method which will be used in load().
 */

function CompressedTextureLoader( manager ) {

        Loader.call( this, manager );

}

CompressedTextureLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: CompressedTextureLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                const scope = this;

                const images = [];

                const texture = new CompressedTexture();
                texture.image = images;

                const loader = new FileLoader( this.manager );
                loader.setPath( this.path );
                loader.setResponseType( 'arraybuffer' );
                loader.setRequestHeader( this.requestHeader );
                loader.setWithCredentials( scope.withCredentials );

                let loaded = 0;

                function loadTexture( i ) {

                        loader.load( url[ i ], function ( buffer ) {

                                const texDatas = scope.parse( buffer, true );

                                images[ i ] = {
                                        width: texDatas.width,
                                        height: texDatas.height,
                                        format: texDatas.format,
                                        mipmaps: texDatas.mipmaps
                                };

                                loaded += 1;

                                if ( loaded === 6 ) {

                                        if ( texDatas.mipmapCount === 1 )
                                                texture.minFilter = LinearFilter;

                                        texture.format = texDatas.format;
                                        texture.needsUpdate = true;

                                        if ( onLoad ) onLoad( texture );

                                }

                        }, onProgress, onError );

                }

                if ( Array.isArray( url ) ) {

                        for ( let i = 0, il = url.length; i < il; ++ i ) {

                                loadTexture( i );

                        }

                } else {

                        // compressed cubemap texture stored in a single DDS file

                        loader.load( url, function ( buffer ) {

                                const texDatas = scope.parse( buffer, true );

                                if ( texDatas.isCubemap ) {

                                        const faces = texDatas.mipmaps.length / texDatas.mipmapCount;

                                        for ( let f = 0; f < faces; f ++ ) {

                                                images[ f ] = { mipmaps: [] };

                                                for ( let i = 0; i < texDatas.mipmapCount; i ++ ) {

                                                        images[ f ].mipmaps.push( texDatas.mipmaps[ f * texDatas.mipmapCount + i ] );
                                                        images[ f ].format = texDatas.format;
                                                        images[ f ].width = texDatas.width;
                                                        images[ f ].height = texDatas.height;

                                                }

                                        }

                                } else {

                                        texture.image.width = texDatas.width;
                                        texture.image.height = texDatas.height;
                                        texture.mipmaps = texDatas.mipmaps;

                                }

                                if ( texDatas.mipmapCount === 1 ) {

                                        texture.minFilter = LinearFilter;

                                }

                                texture.format = texDatas.format;
                                texture.needsUpdate = true;

                                if ( onLoad ) onLoad( texture );

                        }, onProgress, onError );

                }

                return texture;

        }

} );

function ImageLoader( manager ) {

        Loader.call( this, manager );

}

ImageLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: ImageLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                if ( this.path !== undefined ) url = this.path + url;

                url = this.manager.resolveURL( url );

                const scope = this;

                const cached = Cache.get( url );

                if ( cached !== undefined ) {

                        scope.manager.itemStart( url );

                        setTimeout( function () {

                                if ( onLoad ) onLoad( cached );

                                scope.manager.itemEnd( url );

                        }, 0 );

                        return cached;

                }

                const image = document.createElementNS( 'http://www.w3.org/1999/xhtml', 'img' );

                function onImageLoad() {

                        image.removeEventListener( 'load', onImageLoad, false );
                        image.removeEventListener( 'error', onImageError, false );

                        Cache.add( url, this );

                        if ( onLoad ) onLoad( this );

                        scope.manager.itemEnd( url );

                }

                function onImageError( event ) {

                        image.removeEventListener( 'load', onImageLoad, false );
                        image.removeEventListener( 'error', onImageError, false );

                        if ( onError ) onError( event );

                        scope.manager.itemError( url );
                        scope.manager.itemEnd( url );

                }

                image.addEventListener( 'load', onImageLoad, false );
                image.addEventListener( 'error', onImageError, false );

                if ( url.substr( 0, 5 ) !== 'data:' ) {

                        if ( this.crossOrigin !== undefined ) image.crossOrigin = this.crossOrigin;

                }

                scope.manager.itemStart( url );

                image.src = url;

                return image;

        }

} );

function CubeTextureLoader( manager ) {

        Loader.call( this, manager );

}

CubeTextureLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: CubeTextureLoader,

        load: function ( urls, onLoad, onProgress, onError ) {

                const texture = new CubeTexture();

                const loader = new ImageLoader( this.manager );
                loader.setCrossOrigin( this.crossOrigin );
                loader.setPath( this.path );

                let loaded = 0;

                function loadTexture( i ) {

                        loader.load( urls[ i ], function ( image ) {

                                texture.images[ i ] = image;

                                loaded ++;

                                if ( loaded === 6 ) {

                                        texture.needsUpdate = true;

                                        if ( onLoad ) onLoad( texture );

                                }

                        }, undefined, onError );

                }

                for ( let i = 0; i < urls.length; ++ i ) {

                        loadTexture( i );

                }

                return texture;

        }

} );

/**
 * Abstract Base class to load generic binary textures formats (rgbe, hdr, ...)
 *
 * Sub classes have to implement the parse() method which will be used in load().
 */

function DataTextureLoader( manager ) {

        Loader.call( this, manager );

}

DataTextureLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: DataTextureLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                const scope = this;

                const texture = new DataTexture();

                const loader = new FileLoader( this.manager );
                loader.setResponseType( 'arraybuffer' );
                loader.setRequestHeader( this.requestHeader );
                loader.setPath( this.path );
                loader.setWithCredentials( scope.withCredentials );
                loader.load( url, function ( buffer ) {

                        const texData = scope.parse( buffer );

                        if ( ! texData ) return;

                        if ( texData.image !== undefined ) {

                                texture.image = texData.image;

                        } else if ( texData.data !== undefined ) {

                                texture.image.width = texData.width;
                                texture.image.height = texData.height;
                                texture.image.data = texData.data;

                        }

                        texture.wrapS = texData.wrapS !== undefined ? texData.wrapS : ClampToEdgeWrapping;
                        texture.wrapT = texData.wrapT !== undefined ? texData.wrapT : ClampToEdgeWrapping;

                        texture.magFilter = texData.magFilter !== undefined ? texData.magFilter : LinearFilter;
                        texture.minFilter = texData.minFilter !== undefined ? texData.minFilter : LinearFilter;

                        texture.anisotropy = texData.anisotropy !== undefined ? texData.anisotropy : 1;

                        if ( texData.format !== undefined ) {

                                texture.format = texData.format;

                        }

                        if ( texData.type !== undefined ) {

                                texture.type = texData.type;

                        }

                        if ( texData.mipmaps !== undefined ) {

                                texture.mipmaps = texData.mipmaps;
                                texture.minFilter = LinearMipmapLinearFilter; // presumably...

                        }

                        if ( texData.mipmapCount === 1 ) {

                                texture.minFilter = LinearFilter;

                        }

                        texture.needsUpdate = true;

                        if ( onLoad ) onLoad( texture, texData );

                }, onProgress, onError );


                return texture;

        }

} );

function TextureLoader( manager ) {

        Loader.call( this, manager );

}

TextureLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: TextureLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                const texture = new Texture();

                const loader = new ImageLoader( this.manager );
                loader.setCrossOrigin( this.crossOrigin );
                loader.setPath( this.path );

                loader.load( url, function ( image ) {

                        texture.image = image;

                        // JPEGs can't have an alpha channel, so memory can be saved by storing them as RGB.
                        const isJPEG = url.search( /\.jpe?g($|\?)/i ) > 0 || url.search( /^data\:image\/jpeg/ ) === 0;

                        texture.format = isJPEG ? RGBFormat : RGBAFormat;
                        texture.needsUpdate = true;

                        if ( onLoad !== undefined ) {

                                onLoad( texture );

                        }

                }, onProgress, onError );

                return texture;

        }

} );

/**
 * Extensible curve object.
 *
 * Some common of curve methods:
 * .getPoint( t, optionalTarget ), .getTangent( t, optionalTarget )
 * .getPointAt( u, optionalTarget ), .getTangentAt( u, optionalTarget )
 * .getPoints(), .getSpacedPoints()
 * .getLength()
 * .updateArcLengths()
 *
 * This following curves inherit from THREE.Curve:
 *
 * -- 2D curves --
 * THREE.ArcCurve
 * THREE.CubicBezierCurve
 * THREE.EllipseCurve
 * THREE.LineCurve
 * THREE.QuadraticBezierCurve
 * THREE.SplineCurve
 *
 * -- 3D curves --
 * THREE.CatmullRomCurve3
 * THREE.CubicBezierCurve3
 * THREE.LineCurve3
 * THREE.QuadraticBezierCurve3
 *
 * A series of curves can be represented as a THREE.CurvePath.
 *
 **/

function Curve() {

        this.type = 'Curve';

        this.arcLengthDivisions = 200;

}

Object.assign( Curve.prototype, {

        // Virtual base class method to overwrite and implement in subclasses
        //      - t [0 .. 1]

        getPoint: function ( /* t, optionalTarget */ ) {

                console.warn( 'THREE.Curve: .getPoint() not implemented.' );
                return null;

        },

        // Get point at relative position in curve according to arc length
        // - u [0 .. 1]

        getPointAt: function ( u, optionalTarget ) {

                const t = this.getUtoTmapping( u );
                return this.getPoint( t, optionalTarget );

        },

        // Get sequence of points using getPoint( t )

        getPoints: function ( divisions = 5 ) {

                const points = [];

                for ( let d = 0; d <= divisions; d ++ ) {

                        points.push( this.getPoint( d / divisions ) );

                }

                return points;

        },

        // Get sequence of points using getPointAt( u )

        getSpacedPoints: function ( divisions = 5 ) {

                const points = [];

                for ( let d = 0; d <= divisions; d ++ ) {

                        points.push( this.getPointAt( d / divisions ) );

                }

                return points;

        },

        // Get total curve arc length

        getLength: function () {

                const lengths = this.getLengths();
                return lengths[ lengths.length - 1 ];

        },

        // Get list of cumulative segment lengths

        getLengths: function ( divisions ) {

                if ( divisions === undefined ) divisions = this.arcLengthDivisions;

                if ( this.cacheArcLengths &&
                        ( this.cacheArcLengths.length === divisions + 1 ) &&
                        ! this.needsUpdate ) {

                        return this.cacheArcLengths;

                }

                this.needsUpdate = false;

                const cache = [];
                let current, last = this.getPoint( 0 );
                let sum = 0;

                cache.push( 0 );

                for ( let p = 1; p <= divisions; p ++ ) {

                        current = this.getPoint( p / divisions );
                        sum += current.distanceTo( last );
                        cache.push( sum );
                        last = current;

                }

                this.cacheArcLengths = cache;

                return cache; // { sums: cache, sum: sum }; Sum is in the last element.

        },

        updateArcLengths: function () {

                this.needsUpdate = true;
                this.getLengths();

        },

        // Given u ( 0 .. 1 ), get a t to find p. This gives you points which are equidistant

        getUtoTmapping: function ( u, distance ) {

                const arcLengths = this.getLengths();

                let i = 0;
                const il = arcLengths.length;

                let targetArcLength; // The targeted u distance value to get

                if ( distance ) {

                        targetArcLength = distance;

                } else {

                        targetArcLength = u * arcLengths[ il - 1 ];

                }

                // binary search for the index with largest value smaller than target u distance

                let low = 0, high = il - 1, comparison;

                while ( low <= high ) {

                        i = Math.floor( low + ( high - low ) / 2 ); // less likely to overflow, though probably not issue here, JS doesn't really have integers, all numbers are floats

                        comparison = arcLengths[ i ] - targetArcLength;

                        if ( comparison < 0 ) {

                                low = i + 1;

                        } else if ( comparison > 0 ) {

                                high = i - 1;

                        } else {

                                high = i;
                                break;

                                // DONE

                        }

                }

                i = high;

                if ( arcLengths[ i ] === targetArcLength ) {

                        return i / ( il - 1 );

                }

                // we could get finer grain at lengths, or use simple interpolation between two points

                const lengthBefore = arcLengths[ i ];
                const lengthAfter = arcLengths[ i + 1 ];

                const segmentLength = lengthAfter - lengthBefore;

                // determine where we are between the 'before' and 'after' points

                const segmentFraction = ( targetArcLength - lengthBefore ) / segmentLength;

                // add that fractional amount to t

                const t = ( i + segmentFraction ) / ( il - 1 );

                return t;

        },

        // Returns a unit vector tangent at t
        // In case any sub curve does not implement its tangent derivation,
        // 2 points a small delta apart will be used to find its gradient
        // which seems to give a reasonable approximation

        getTangent: function ( t, optionalTarget ) {

                const delta = 0.0001;
                let t1 = t - delta;
                let t2 = t + delta;

                // Capping in case of danger

                if ( t1 < 0 ) t1 = 0;
                if ( t2 > 1 ) t2 = 1;

                const pt1 = this.getPoint( t1 );
                const pt2 = this.getPoint( t2 );

                const tangent = optionalTarget || ( ( pt1.isVector2 ) ? new Vector2() : new Vector3() );

                tangent.copy( pt2 ).sub( pt1 ).normalize();

                return tangent;

        },

        getTangentAt: function ( u, optionalTarget ) {

                const t = this.getUtoTmapping( u );
                return this.getTangent( t, optionalTarget );

        },

        computeFrenetFrames: function ( segments, closed ) {

                // see http://www.cs.indiana.edu/pub/techreports/TR425.pdf

                const normal = new Vector3();

                const tangents = [];
                const normals = [];
                const binormals = [];

                const vec = new Vector3();
                const mat = new Matrix4();

                // compute the tangent vectors for each segment on the curve

                for ( let i = 0; i <= segments; i ++ ) {

                        const u = i / segments;

                        tangents[ i ] = this.getTangentAt( u, new Vector3() );
                        tangents[ i ].normalize();

                }

                // select an initial normal vector perpendicular to the first tangent vector,
                // and in the direction of the minimum tangent xyz component

                normals[ 0 ] = new Vector3();
                binormals[ 0 ] = new Vector3();
                let min = Number.MAX_VALUE;
                const tx = Math.abs( tangents[ 0 ].x );
                const ty = Math.abs( tangents[ 0 ].y );
                const tz = Math.abs( tangents[ 0 ].z );

                if ( tx <= min ) {

                        min = tx;
                        normal.set( 1, 0, 0 );

                }

                if ( ty <= min ) {

                        min = ty;
                        normal.set( 0, 1, 0 );

                }

                if ( tz <= min ) {

                        normal.set( 0, 0, 1 );

                }

                vec.crossVectors( tangents[ 0 ], normal ).normalize();

                normals[ 0 ].crossVectors( tangents[ 0 ], vec );
                binormals[ 0 ].crossVectors( tangents[ 0 ], normals[ 0 ] );


                // compute the slowly-varying normal and binormal vectors for each segment on the curve

                for ( let i = 1; i <= segments; i ++ ) {

                        normals[ i ] = normals[ i - 1 ].clone();

                        binormals[ i ] = binormals[ i - 1 ].clone();

                        vec.crossVectors( tangents[ i - 1 ], tangents[ i ] );

                        if ( vec.length() > Number.EPSILON ) {

                                vec.normalize();

                                const theta = Math.acos( MathUtils.clamp( tangents[ i - 1 ].dot( tangents[ i ] ), - 1, 1 ) ); // clamp for floating pt errors

                                normals[ i ].applyMatrix4( mat.makeRotationAxis( vec, theta ) );

                        }

                        binormals[ i ].crossVectors( tangents[ i ], normals[ i ] );

                }

                // if the curve is closed, postprocess the vectors so the first and last normal vectors are the same

                if ( closed === true ) {

                        let theta = Math.acos( MathUtils.clamp( normals[ 0 ].dot( normals[ segments ] ), - 1, 1 ) );
                        theta /= segments;

                        if ( tangents[ 0 ].dot( vec.crossVectors( normals[ 0 ], normals[ segments ] ) ) > 0 ) {

                                theta = - theta;

                        }

                        for ( let i = 1; i <= segments; i ++ ) {

                                // twist a little...
                                normals[ i ].applyMatrix4( mat.makeRotationAxis( tangents[ i ], theta * i ) );
                                binormals[ i ].crossVectors( tangents[ i ], normals[ i ] );

                        }

                }

                return {
                        tangents: tangents,
                        normals: normals,
                        binormals: binormals
                };

        },

        clone: function () {

                return new this.constructor().copy( this );

        },

        copy: function ( source ) {

                this.arcLengthDivisions = source.arcLengthDivisions;

                return this;

        },

        toJSON: function () {

                const data = {
                        metadata: {
                                version: 4.5,
                                type: 'Curve',
                                generator: 'Curve.toJSON'
                        }
                };

                data.arcLengthDivisions = this.arcLengthDivisions;
                data.type = this.type;

                return data;

        },

        fromJSON: function ( json ) {

                this.arcLengthDivisions = json.arcLengthDivisions;

                return this;

        }

} );

function EllipseCurve( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {

        Curve.call( this );

        this.type = 'EllipseCurve';

        this.aX = aX || 0;
        this.aY = aY || 0;

        this.xRadius = xRadius || 1;
        this.yRadius = yRadius || 1;

        this.aStartAngle = aStartAngle || 0;
        this.aEndAngle = aEndAngle || 2 * Math.PI;

        this.aClockwise = aClockwise || false;

        this.aRotation = aRotation || 0;

}

EllipseCurve.prototype = Object.create( Curve.prototype );
EllipseCurve.prototype.constructor = EllipseCurve;

EllipseCurve.prototype.isEllipseCurve = true;

EllipseCurve.prototype.getPoint = function ( t, optionalTarget ) {

        const point = optionalTarget || new Vector2();

        const twoPi = Math.PI * 2;
        let deltaAngle = this.aEndAngle - this.aStartAngle;
        const samePoints = Math.abs( deltaAngle ) < Number.EPSILON;

        // ensures that deltaAngle is 0 .. 2 PI
        while ( deltaAngle < 0 ) deltaAngle += twoPi;
        while ( deltaAngle > twoPi ) deltaAngle -= twoPi;

        if ( deltaAngle < Number.EPSILON ) {

                if ( samePoints ) {

                        deltaAngle = 0;

                } else {

                        deltaAngle = twoPi;

                }

        }

        if ( this.aClockwise === true && ! samePoints ) {

                if ( deltaAngle === twoPi ) {

                        deltaAngle = - twoPi;

                } else {

                        deltaAngle = deltaAngle - twoPi;

                }

        }

        const angle = this.aStartAngle + t * deltaAngle;
        let x = this.aX + this.xRadius * Math.cos( angle );
        let y = this.aY + this.yRadius * Math.sin( angle );

        if ( this.aRotation !== 0 ) {

                const cos = Math.cos( this.aRotation );
                const sin = Math.sin( this.aRotation );

                const tx = x - this.aX;
                const ty = y - this.aY;

                // Rotate the point about the center of the ellipse.
                x = tx * cos - ty * sin + this.aX;
                y = tx * sin + ty * cos + this.aY;

        }

        return point.set( x, y );

};

EllipseCurve.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.aX = source.aX;
        this.aY = source.aY;

        this.xRadius = source.xRadius;
        this.yRadius = source.yRadius;

        this.aStartAngle = source.aStartAngle;
        this.aEndAngle = source.aEndAngle;

        this.aClockwise = source.aClockwise;

        this.aRotation = source.aRotation;

        return this;

};


EllipseCurve.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.aX = this.aX;
        data.aY = this.aY;

        data.xRadius = this.xRadius;
        data.yRadius = this.yRadius;

        data.aStartAngle = this.aStartAngle;
        data.aEndAngle = this.aEndAngle;

        data.aClockwise = this.aClockwise;

        data.aRotation = this.aRotation;

        return data;

};

EllipseCurve.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.aX = json.aX;
        this.aY = json.aY;

        this.xRadius = json.xRadius;
        this.yRadius = json.yRadius;

        this.aStartAngle = json.aStartAngle;
        this.aEndAngle = json.aEndAngle;

        this.aClockwise = json.aClockwise;

        this.aRotation = json.aRotation;

        return this;

};

function ArcCurve( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

        EllipseCurve.call( this, aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise );

        this.type = 'ArcCurve';

}

ArcCurve.prototype = Object.create( EllipseCurve.prototype );
ArcCurve.prototype.constructor = ArcCurve;

ArcCurve.prototype.isArcCurve = true;

/**
 * Centripetal CatmullRom Curve - which is useful for avoiding
 * cusps and self-intersections in non-uniform catmull rom curves.
 * http://www.cemyuksel.com/research/catmullrom_param/catmullrom.pdf
 *
 * curve.type accepts centripetal(default), chordal and catmullrom
 * curve.tension is used for catmullrom which defaults to 0.5
 */


/*
Based on an optimized c++ solution in
 - http://stackoverflow.com/questions/9489736/catmull-rom-curve-with-no-cusps-and-no-self-intersections/
 - http://ideone.com/NoEbVM

This CubicPoly class could be used for reusing some variables and calculations,
but for three.js curve use, it could be possible inlined and flatten into a single function call
which can be placed in CurveUtils.
*/

function CubicPoly() {

        let c0 = 0, c1 = 0, c2 = 0, c3 = 0;

        /*
         * Compute coefficients for a cubic polynomial
         *   p(s) = c0 + c1*s + c2*s^2 + c3*s^3
         * such that
         *   p(0) = x0, p(1) = x1
         *  and
         *   p'(0) = t0, p'(1) = t1.
         */
        function init( x0, x1, t0, t1 ) {

                c0 = x0;
                c1 = t0;
                c2 = - 3 * x0 + 3 * x1 - 2 * t0 - t1;
                c3 = 2 * x0 - 2 * x1 + t0 + t1;

        }

        return {

                initCatmullRom: function ( x0, x1, x2, x3, tension ) {

                        init( x1, x2, tension * ( x2 - x0 ), tension * ( x3 - x1 ) );

                },

                initNonuniformCatmullRom: function ( x0, x1, x2, x3, dt0, dt1, dt2 ) {

                        // compute tangents when parameterized in [t1,t2]
                        let t1 = ( x1 - x0 ) / dt0 - ( x2 - x0 ) / ( dt0 + dt1 ) + ( x2 - x1 ) / dt1;
                        let t2 = ( x2 - x1 ) / dt1 - ( x3 - x1 ) / ( dt1 + dt2 ) + ( x3 - x2 ) / dt2;

                        // rescale tangents for parametrization in [0,1]
                        t1 *= dt1;
                        t2 *= dt1;

                        init( x1, x2, t1, t2 );

                },

                calc: function ( t ) {

                        const t2 = t * t;
                        const t3 = t2 * t;
                        return c0 + c1 * t + c2 * t2 + c3 * t3;

                }

        };

}

//

const tmp = new Vector3();
const px = new CubicPoly(), py = new CubicPoly(), pz = new CubicPoly();

function CatmullRomCurve3( points = [], closed = false, curveType = 'centripetal', tension = 0.5 ) {

        Curve.call( this );

        this.type = 'CatmullRomCurve3';

        this.points = points;
        this.closed = closed;
        this.curveType = curveType;
        this.tension = tension;

}

CatmullRomCurve3.prototype = Object.create( Curve.prototype );
CatmullRomCurve3.prototype.constructor = CatmullRomCurve3;

CatmullRomCurve3.prototype.isCatmullRomCurve3 = true;

CatmullRomCurve3.prototype.getPoint = function ( t, optionalTarget = new Vector3() ) {

        const point = optionalTarget;

        const points = this.points;
        const l = points.length;

        const p = ( l - ( this.closed ? 0 : 1 ) ) * t;
        let intPoint = Math.floor( p );
        let weight = p - intPoint;

        if ( this.closed ) {

                intPoint += intPoint > 0 ? 0 : ( Math.floor( Math.abs( intPoint ) / l ) + 1 ) * l;

        } else if ( weight === 0 && intPoint === l - 1 ) {

                intPoint = l - 2;
                weight = 1;

        }

        let p0, p3; // 4 points (p1 & p2 defined below)

        if ( this.closed || intPoint > 0 ) {

                p0 = points[ ( intPoint - 1 ) % l ];

        } else {

                // extrapolate first point
                tmp.subVectors( points[ 0 ], points[ 1 ] ).add( points[ 0 ] );
                p0 = tmp;

        }

        const p1 = points[ intPoint % l ];
        const p2 = points[ ( intPoint + 1 ) % l ];

        if ( this.closed || intPoint + 2 < l ) {

                p3 = points[ ( intPoint + 2 ) % l ];

        } else {

                // extrapolate last point
                tmp.subVectors( points[ l - 1 ], points[ l - 2 ] ).add( points[ l - 1 ] );
                p3 = tmp;

        }

        if ( this.curveType === 'centripetal' || this.curveType === 'chordal' ) {

                // init Centripetal / Chordal Catmull-Rom
                const pow = this.curveType === 'chordal' ? 0.5 : 0.25;
                let dt0 = Math.pow( p0.distanceToSquared( p1 ), pow );
                let dt1 = Math.pow( p1.distanceToSquared( p2 ), pow );
                let dt2 = Math.pow( p2.distanceToSquared( p3 ), pow );

                // safety check for repeated points
                if ( dt1 < 1e-4 ) dt1 = 1.0;
                if ( dt0 < 1e-4 ) dt0 = dt1;
                if ( dt2 < 1e-4 ) dt2 = dt1;

                px.initNonuniformCatmullRom( p0.x, p1.x, p2.x, p3.x, dt0, dt1, dt2 );
                py.initNonuniformCatmullRom( p0.y, p1.y, p2.y, p3.y, dt0, dt1, dt2 );
                pz.initNonuniformCatmullRom( p0.z, p1.z, p2.z, p3.z, dt0, dt1, dt2 );

        } else if ( this.curveType === 'catmullrom' ) {

                px.initCatmullRom( p0.x, p1.x, p2.x, p3.x, this.tension );
                py.initCatmullRom( p0.y, p1.y, p2.y, p3.y, this.tension );
                pz.initCatmullRom( p0.z, p1.z, p2.z, p3.z, this.tension );

        }

        point.set(
                px.calc( weight ),
                py.calc( weight ),
                pz.calc( weight )
        );

        return point;

};

CatmullRomCurve3.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.points = [];

        for ( let i = 0, l = source.points.length; i < l; i ++ ) {

                const point = source.points[ i ];

                this.points.push( point.clone() );

        }

        this.closed = source.closed;
        this.curveType = source.curveType;
        this.tension = source.tension;

        return this;

};

CatmullRomCurve3.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.points = [];

        for ( let i = 0, l = this.points.length; i < l; i ++ ) {

                const point = this.points[ i ];
                data.points.push( point.toArray() );

        }

        data.closed = this.closed;
        data.curveType = this.curveType;
        data.tension = this.tension;

        return data;

};

CatmullRomCurve3.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.points = [];

        for ( let i = 0, l = json.points.length; i < l; i ++ ) {

                const point = json.points[ i ];
                this.points.push( new Vector3().fromArray( point ) );

        }

        this.closed = json.closed;
        this.curveType = json.curveType;
        this.tension = json.tension;

        return this;

};

/**
 * Bezier Curves formulas obtained from
 * http://en.wikipedia.org/wiki/Bézier_curve
 */

function CatmullRom( t, p0, p1, p2, p3 ) {

        const v0 = ( p2 - p0 ) * 0.5;
        const v1 = ( p3 - p1 ) * 0.5;
        const t2 = t * t;
        const t3 = t * t2;
        return ( 2 * p1 - 2 * p2 + v0 + v1 ) * t3 + ( - 3 * p1 + 3 * p2 - 2 * v0 - v1 ) * t2 + v0 * t + p1;

}

//

function QuadraticBezierP0( t, p ) {

        const k = 1 - t;
        return k * k * p;

}

function QuadraticBezierP1( t, p ) {

        return 2 * ( 1 - t ) * t * p;

}

function QuadraticBezierP2( t, p ) {

        return t * t * p;

}

function QuadraticBezier( t, p0, p1, p2 ) {

        return QuadraticBezierP0( t, p0 ) + QuadraticBezierP1( t, p1 ) +
                QuadraticBezierP2( t, p2 );

}

//

function CubicBezierP0( t, p ) {

        const k = 1 - t;
        return k * k * k * p;

}

function CubicBezierP1( t, p ) {

        const k = 1 - t;
        return 3 * k * k * t * p;

}

function CubicBezierP2( t, p ) {

        return 3 * ( 1 - t ) * t * t * p;

}

function CubicBezierP3( t, p ) {

        return t * t * t * p;

}

function CubicBezier( t, p0, p1, p2, p3 ) {

        return CubicBezierP0( t, p0 ) + CubicBezierP1( t, p1 ) + CubicBezierP2( t, p2 ) +
                CubicBezierP3( t, p3 );

}

function CubicBezierCurve( v0 = new Vector2(), v1 = new Vector2(), v2 = new Vector2(), v3 = new Vector2() ) {

        Curve.call( this );

        this.type = 'CubicBezierCurve';

        this.v0 = v0;
        this.v1 = v1;
        this.v2 = v2;
        this.v3 = v3;

}

CubicBezierCurve.prototype = Object.create( Curve.prototype );
CubicBezierCurve.prototype.constructor = CubicBezierCurve;

CubicBezierCurve.prototype.isCubicBezierCurve = true;

CubicBezierCurve.prototype.getPoint = function ( t, optionalTarget = new Vector2() ) {

        const point = optionalTarget;

        const v0 = this.v0, v1 = this.v1, v2 = this.v2, v3 = this.v3;

        point.set(
                CubicBezier( t, v0.x, v1.x, v2.x, v3.x ),
                CubicBezier( t, v0.y, v1.y, v2.y, v3.y )
        );

        return point;

};

CubicBezierCurve.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.v0.copy( source.v0 );
        this.v1.copy( source.v1 );
        this.v2.copy( source.v2 );
        this.v3.copy( source.v3 );

        return this;

};

CubicBezierCurve.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.v0 = this.v0.toArray();
        data.v1 = this.v1.toArray();
        data.v2 = this.v2.toArray();
        data.v3 = this.v3.toArray();

        return data;

};

CubicBezierCurve.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.v0.fromArray( json.v0 );
        this.v1.fromArray( json.v1 );
        this.v2.fromArray( json.v2 );
        this.v3.fromArray( json.v3 );

        return this;

};

function CubicBezierCurve3( v0 = new Vector3(), v1 = new Vector3(), v2 = new Vector3(), v3 = new Vector3() ) {

        Curve.call( this );

        this.type = 'CubicBezierCurve3';

        this.v0 = v0;
        this.v1 = v1;
        this.v2 = v2;
        this.v3 = v3;

}

CubicBezierCurve3.prototype = Object.create( Curve.prototype );
CubicBezierCurve3.prototype.constructor = CubicBezierCurve3;

CubicBezierCurve3.prototype.isCubicBezierCurve3 = true;

CubicBezierCurve3.prototype.getPoint = function ( t, optionalTarget = new Vector3() ) {

        const point = optionalTarget;

        const v0 = this.v0, v1 = this.v1, v2 = this.v2, v3 = this.v3;

        point.set(
                CubicBezier( t, v0.x, v1.x, v2.x, v3.x ),
                CubicBezier( t, v0.y, v1.y, v2.y, v3.y ),
                CubicBezier( t, v0.z, v1.z, v2.z, v3.z )
        );

        return point;

};

CubicBezierCurve3.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.v0.copy( source.v0 );
        this.v1.copy( source.v1 );
        this.v2.copy( source.v2 );
        this.v3.copy( source.v3 );

        return this;

};

CubicBezierCurve3.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.v0 = this.v0.toArray();
        data.v1 = this.v1.toArray();
        data.v2 = this.v2.toArray();
        data.v3 = this.v3.toArray();

        return data;

};

CubicBezierCurve3.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.v0.fromArray( json.v0 );
        this.v1.fromArray( json.v1 );
        this.v2.fromArray( json.v2 );
        this.v3.fromArray( json.v3 );

        return this;

};

function LineCurve( v1 = new Vector2(), v2 = new Vector2() ) {

        Curve.call( this );

        this.type = 'LineCurve';

        this.v1 = v1;
        this.v2 = v2;

}

LineCurve.prototype = Object.create( Curve.prototype );
LineCurve.prototype.constructor = LineCurve;

LineCurve.prototype.isLineCurve = true;

LineCurve.prototype.getPoint = function ( t, optionalTarget = new Vector2() ) {

        const point = optionalTarget;

        if ( t === 1 ) {

                point.copy( this.v2 );

        } else {

                point.copy( this.v2 ).sub( this.v1 );
                point.multiplyScalar( t ).add( this.v1 );

        }

        return point;

};

// Line curve is linear, so we can overwrite default getPointAt

LineCurve.prototype.getPointAt = function ( u, optionalTarget ) {

        return this.getPoint( u, optionalTarget );

};

LineCurve.prototype.getTangent = function ( t, optionalTarget ) {

        const tangent = optionalTarget || new Vector2();

        tangent.copy( this.v2 ).sub( this.v1 ).normalize();

        return tangent;

};

LineCurve.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.v1.copy( source.v1 );
        this.v2.copy( source.v2 );

        return this;

};

LineCurve.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.v1 = this.v1.toArray();
        data.v2 = this.v2.toArray();

        return data;

};

LineCurve.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.v1.fromArray( json.v1 );
        this.v2.fromArray( json.v2 );

        return this;

};

function LineCurve3( v1 = new Vector3(), v2 = new Vector3() ) {

        Curve.call( this );

        this.type = 'LineCurve3';

        this.v1 = v1;
        this.v2 = v2;

}

LineCurve3.prototype = Object.create( Curve.prototype );
LineCurve3.prototype.constructor = LineCurve3;

LineCurve3.prototype.isLineCurve3 = true;

LineCurve3.prototype.getPoint = function ( t, optionalTarget = new Vector3() ) {

        const point = optionalTarget;

        if ( t === 1 ) {

                point.copy( this.v2 );

        } else {

                point.copy( this.v2 ).sub( this.v1 );
                point.multiplyScalar( t ).add( this.v1 );

        }

        return point;

};

// Line curve is linear, so we can overwrite default getPointAt

LineCurve3.prototype.getPointAt = function ( u, optionalTarget ) {

        return this.getPoint( u, optionalTarget );

};

LineCurve3.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.v1.copy( source.v1 );
        this.v2.copy( source.v2 );

        return this;

};

LineCurve3.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.v1 = this.v1.toArray();
        data.v2 = this.v2.toArray();

        return data;

};

LineCurve3.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.v1.fromArray( json.v1 );
        this.v2.fromArray( json.v2 );

        return this;

};

function QuadraticBezierCurve( v0 = new Vector2(), v1 = new Vector2(), v2 = new Vector2() ) {

        Curve.call( this );

        this.type = 'QuadraticBezierCurve';

        this.v0 = v0;
        this.v1 = v1;
        this.v2 = v2;

}

QuadraticBezierCurve.prototype = Object.create( Curve.prototype );
QuadraticBezierCurve.prototype.constructor = QuadraticBezierCurve;

QuadraticBezierCurve.prototype.isQuadraticBezierCurve = true;

QuadraticBezierCurve.prototype.getPoint = function ( t, optionalTarget = new Vector2() ) {

        const point = optionalTarget;

        const v0 = this.v0, v1 = this.v1, v2 = this.v2;

        point.set(
                QuadraticBezier( t, v0.x, v1.x, v2.x ),
                QuadraticBezier( t, v0.y, v1.y, v2.y )
        );

        return point;

};

QuadraticBezierCurve.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.v0.copy( source.v0 );
        this.v1.copy( source.v1 );
        this.v2.copy( source.v2 );

        return this;

};

QuadraticBezierCurve.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.v0 = this.v0.toArray();
        data.v1 = this.v1.toArray();
        data.v2 = this.v2.toArray();

        return data;

};

QuadraticBezierCurve.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.v0.fromArray( json.v0 );
        this.v1.fromArray( json.v1 );
        this.v2.fromArray( json.v2 );

        return this;

};

function QuadraticBezierCurve3( v0 = new Vector3(), v1 = new Vector3(), v2 = new Vector3() ) {

        Curve.call( this );

        this.type = 'QuadraticBezierCurve3';

        this.v0 = v0;
        this.v1 = v1;
        this.v2 = v2;

}

QuadraticBezierCurve3.prototype = Object.create( Curve.prototype );
QuadraticBezierCurve3.prototype.constructor = QuadraticBezierCurve3;

QuadraticBezierCurve3.prototype.isQuadraticBezierCurve3 = true;

QuadraticBezierCurve3.prototype.getPoint = function ( t, optionalTarget = new Vector3() ) {

        const point = optionalTarget;

        const v0 = this.v0, v1 = this.v1, v2 = this.v2;

        point.set(
                QuadraticBezier( t, v0.x, v1.x, v2.x ),
                QuadraticBezier( t, v0.y, v1.y, v2.y ),
                QuadraticBezier( t, v0.z, v1.z, v2.z )
        );

        return point;

};

QuadraticBezierCurve3.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.v0.copy( source.v0 );
        this.v1.copy( source.v1 );
        this.v2.copy( source.v2 );

        return this;

};

QuadraticBezierCurve3.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.v0 = this.v0.toArray();
        data.v1 = this.v1.toArray();
        data.v2 = this.v2.toArray();

        return data;

};

QuadraticBezierCurve3.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.v0.fromArray( json.v0 );
        this.v1.fromArray( json.v1 );
        this.v2.fromArray( json.v2 );

        return this;

};

function SplineCurve( points = [] ) {

        Curve.call( this );

        this.type = 'SplineCurve';

        this.points = points;

}

SplineCurve.prototype = Object.create( Curve.prototype );
SplineCurve.prototype.constructor = SplineCurve;

SplineCurve.prototype.isSplineCurve = true;

SplineCurve.prototype.getPoint = function ( t, optionalTarget = new Vector2() ) {

        const point = optionalTarget;

        const points = this.points;
        const p = ( points.length - 1 ) * t;

        const intPoint = Math.floor( p );
        const weight = p - intPoint;

        const p0 = points[ intPoint === 0 ? intPoint : intPoint - 1 ];
        const p1 = points[ intPoint ];
        const p2 = points[ intPoint > points.length - 2 ? points.length - 1 : intPoint + 1 ];
        const p3 = points[ intPoint > points.length - 3 ? points.length - 1 : intPoint + 2 ];

        point.set(
                CatmullRom( weight, p0.x, p1.x, p2.x, p3.x ),
                CatmullRom( weight, p0.y, p1.y, p2.y, p3.y )
        );

        return point;

};

SplineCurve.prototype.copy = function ( source ) {

        Curve.prototype.copy.call( this, source );

        this.points = [];

        for ( let i = 0, l = source.points.length; i < l; i ++ ) {

                const point = source.points[ i ];

                this.points.push( point.clone() );

        }

        return this;

};

SplineCurve.prototype.toJSON = function () {

        const data = Curve.prototype.toJSON.call( this );

        data.points = [];

        for ( let i = 0, l = this.points.length; i < l; i ++ ) {

                const point = this.points[ i ];
                data.points.push( point.toArray() );

        }

        return data;

};

SplineCurve.prototype.fromJSON = function ( json ) {

        Curve.prototype.fromJSON.call( this, json );

        this.points = [];

        for ( let i = 0, l = json.points.length; i < l; i ++ ) {

                const point = json.points[ i ];
                this.points.push( new Vector2().fromArray( point ) );

        }

        return this;

};

var Curves = /*#__PURE__*/Object.freeze({
        __proto__: null,
        ArcCurve: ArcCurve,
        CatmullRomCurve3: CatmullRomCurve3,
        CubicBezierCurve: CubicBezierCurve,
        CubicBezierCurve3: CubicBezierCurve3,
        EllipseCurve: EllipseCurve,
        LineCurve: LineCurve,
        LineCurve3: LineCurve3,
        QuadraticBezierCurve: QuadraticBezierCurve,
        QuadraticBezierCurve3: QuadraticBezierCurve3,
        SplineCurve: SplineCurve
});

/**************************************************************
 *      Curved Path - a curve path is simply a array of connected
 *  curves, but retains the api of a curve
 **************************************************************/

function CurvePath() {

        Curve.call( this );

        this.type = 'CurvePath';

        this.curves = [];
        this.autoClose = false; // Automatically closes the path

}

CurvePath.prototype = Object.assign( Object.create( Curve.prototype ), {

        constructor: CurvePath,

        add: function ( curve ) {

                this.curves.push( curve );

        },

        closePath: function () {

                // Add a line curve if start and end of lines are not connected
                const startPoint = this.curves[ 0 ].getPoint( 0 );
                const endPoint = this.curves[ this.curves.length - 1 ].getPoint( 1 );

                if ( ! startPoint.equals( endPoint ) ) {

                        this.curves.push( new LineCurve( endPoint, startPoint ) );

                }

        },

        // To get accurate point with reference to
        // entire path distance at time t,
        // following has to be done:

        // 1. Length of each sub path have to be known
        // 2. Locate and identify type of curve
        // 3. Get t for the curve
        // 4. Return curve.getPointAt(t')

        getPoint: function ( t ) {

                const d = t * this.getLength();
                const curveLengths = this.getCurveLengths();
                let i = 0;

                // To think about boundaries points.

                while ( i < curveLengths.length ) {

                        if ( curveLengths[ i ] >= d ) {

                                const diff = curveLengths[ i ] - d;
                                const curve = this.curves[ i ];

                                const segmentLength = curve.getLength();
                                const u = segmentLength === 0 ? 0 : 1 - diff / segmentLength;

                                return curve.getPointAt( u );

                        }

                        i ++;

                }

                return null;

                // loop where sum != 0, sum > d , sum+1 <d

        },

        // We cannot use the default THREE.Curve getPoint() with getLength() because in
        // THREE.Curve, getLength() depends on getPoint() but in THREE.CurvePath
        // getPoint() depends on getLength

        getLength: function () {

                const lens = this.getCurveLengths();
                return lens[ lens.length - 1 ];

        },

        // cacheLengths must be recalculated.
        updateArcLengths: function () {

                this.needsUpdate = true;
                this.cacheLengths = null;
                this.getCurveLengths();

        },

        // Compute lengths and cache them
        // We cannot overwrite getLengths() because UtoT mapping uses it.

        getCurveLengths: function () {

                // We use cache values if curves and cache array are same length

                if ( this.cacheLengths && this.cacheLengths.length === this.curves.length ) {

                        return this.cacheLengths;

                }

                // Get length of sub-curve
                // Push sums into cached array

                const lengths = [];
                let sums = 0;

                for ( let i = 0, l = this.curves.length; i < l; i ++ ) {

                        sums += this.curves[ i ].getLength();
                        lengths.push( sums );

                }

                this.cacheLengths = lengths;

                return lengths;

        },

        getSpacedPoints: function ( divisions = 40 ) {

                const points = [];

                for ( let i = 0; i <= divisions; i ++ ) {

                        points.push( this.getPoint( i / divisions ) );

                }

                if ( this.autoClose ) {

                        points.push( points[ 0 ] );

                }

                return points;

        },

        getPoints: function ( divisions = 12 ) {

                const points = [];
                let last;

                for ( let i = 0, curves = this.curves; i < curves.length; i ++ ) {

                        const curve = curves[ i ];
                        const resolution = ( curve && curve.isEllipseCurve ) ? divisions * 2
                                : ( curve && ( curve.isLineCurve || curve.isLineCurve3 ) ) ? 1
                                        : ( curve && curve.isSplineCurve ) ? divisions * curve.points.length
                                                : divisions;

                        const pts = curve.getPoints( resolution );

                        for ( let j = 0; j < pts.length; j ++ ) {

                                const point = pts[ j ];

                                if ( last && last.equals( point ) ) continue; // ensures no consecutive points are duplicates

                                points.push( point );
                                last = point;

                        }

                }

                if ( this.autoClose && points.length > 1 && ! points[ points.length - 1 ].equals( points[ 0 ] ) ) {

                        points.push( points[ 0 ] );

                }

                return points;

        },

        copy: function ( source ) {

                Curve.prototype.copy.call( this, source );

                this.curves = [];

                for ( let i = 0, l = source.curves.length; i < l; i ++ ) {

                        const curve = source.curves[ i ];

                        this.curves.push( curve.clone() );

                }

                this.autoClose = source.autoClose;

                return this;

        },

        toJSON: function () {

                const data = Curve.prototype.toJSON.call( this );

                data.autoClose = this.autoClose;
                data.curves = [];

                for ( let i = 0, l = this.curves.length; i < l; i ++ ) {

                        const curve = this.curves[ i ];
                        data.curves.push( curve.toJSON() );

                }

                return data;

        },

        fromJSON: function ( json ) {

                Curve.prototype.fromJSON.call( this, json );

                this.autoClose = json.autoClose;
                this.curves = [];

                for ( let i = 0, l = json.curves.length; i < l; i ++ ) {

                        const curve = json.curves[ i ];
                        this.curves.push( new Curves[ curve.type ]().fromJSON( curve ) );

                }

                return this;

        }

} );

function Path( points ) {

        CurvePath.call( this );

        this.type = 'Path';

        this.currentPoint = new Vector2();

        if ( points ) {

                this.setFromPoints( points );

        }

}

Path.prototype = Object.assign( Object.create( CurvePath.prototype ), {

        constructor: Path,

        setFromPoints: function ( points ) {

                this.moveTo( points[ 0 ].x, points[ 0 ].y );

                for ( let i = 1, l = points.length; i < l; i ++ ) {

                        this.lineTo( points[ i ].x, points[ i ].y );

                }

                return this;

        },

        moveTo: function ( x, y ) {

                this.currentPoint.set( x, y ); // TODO consider referencing vectors instead of copying?

                return this;

        },

        lineTo: function ( x, y ) {

                const curve = new LineCurve( this.currentPoint.clone(), new Vector2( x, y ) );
                this.curves.push( curve );

                this.currentPoint.set( x, y );

                return this;

        },

        quadraticCurveTo: function ( aCPx, aCPy, aX, aY ) {

                const curve = new QuadraticBezierCurve(
                        this.currentPoint.clone(),
                        new Vector2( aCPx, aCPy ),
                        new Vector2( aX, aY )
                );

                this.curves.push( curve );

                this.currentPoint.set( aX, aY );

                return this;

        },

        bezierCurveTo: function ( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY ) {

                const curve = new CubicBezierCurve(
                        this.currentPoint.clone(),
                        new Vector2( aCP1x, aCP1y ),
                        new Vector2( aCP2x, aCP2y ),
                        new Vector2( aX, aY )
                );

                this.curves.push( curve );

                this.currentPoint.set( aX, aY );

                return this;

        },

        splineThru: function ( pts /*Array of Vector*/ ) {

                const npts = [ this.currentPoint.clone() ].concat( pts );

                const curve = new SplineCurve( npts );
                this.curves.push( curve );

                this.currentPoint.copy( pts[ pts.length - 1 ] );

                return this;

        },

        arc: function ( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

                const x0 = this.currentPoint.x;
                const y0 = this.currentPoint.y;

                this.absarc( aX + x0, aY + y0, aRadius,
                        aStartAngle, aEndAngle, aClockwise );

                return this;

        },

        absarc: function ( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

                this.absellipse( aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise );

                return this;

        },

        ellipse: function ( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {

                const x0 = this.currentPoint.x;
                const y0 = this.currentPoint.y;

                this.absellipse( aX + x0, aY + y0, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation );

                return this;

        },

        absellipse: function ( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {

                const curve = new EllipseCurve( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation );

                if ( this.curves.length > 0 ) {

                        // if a previous curve is present, attempt to join
                        const firstPoint = curve.getPoint( 0 );

                        if ( ! firstPoint.equals( this.currentPoint ) ) {

                                this.lineTo( firstPoint.x, firstPoint.y );

                        }

                }

                this.curves.push( curve );

                const lastPoint = curve.getPoint( 1 );
                this.currentPoint.copy( lastPoint );

                return this;

        },

        copy: function ( source ) {

                CurvePath.prototype.copy.call( this, source );

                this.currentPoint.copy( source.currentPoint );

                return this;

        },

        toJSON: function () {

                const data = CurvePath.prototype.toJSON.call( this );

                data.currentPoint = this.currentPoint.toArray();

                return data;

        },

        fromJSON: function ( json ) {

                CurvePath.prototype.fromJSON.call( this, json );

                this.currentPoint.fromArray( json.currentPoint );

                return this;

        }

} );

function Shape( points ) {

        Path.call( this, points );

        this.uuid = MathUtils.generateUUID();

        this.type = 'Shape';

        this.holes = [];

}

Shape.prototype = Object.assign( Object.create( Path.prototype ), {

        constructor: Shape,

        getPointsHoles: function ( divisions ) {

                const holesPts = [];

                for ( let i = 0, l = this.holes.length; i < l; i ++ ) {

                        holesPts[ i ] = this.holes[ i ].getPoints( divisions );

                }

                return holesPts;

        },

        // get points of shape and holes (keypoints based on segments parameter)

        extractPoints: function ( divisions ) {

                return {

                        shape: this.getPoints( divisions ),
                        holes: this.getPointsHoles( divisions )

                };

        },

        copy: function ( source ) {

                Path.prototype.copy.call( this, source );

                this.holes = [];

                for ( let i = 0, l = source.holes.length; i < l; i ++ ) {

                        const hole = source.holes[ i ];

                        this.holes.push( hole.clone() );

                }

                return this;

        },

        toJSON: function () {

                const data = Path.prototype.toJSON.call( this );

                data.uuid = this.uuid;
                data.holes = [];

                for ( let i = 0, l = this.holes.length; i < l; i ++ ) {

                        const hole = this.holes[ i ];
                        data.holes.push( hole.toJSON() );

                }

                return data;

        },

        fromJSON: function ( json ) {

                Path.prototype.fromJSON.call( this, json );

                this.uuid = json.uuid;
                this.holes = [];

                for ( let i = 0, l = json.holes.length; i < l; i ++ ) {

                        const hole = json.holes[ i ];
                        this.holes.push( new Path().fromJSON( hole ) );

                }

                return this;

        }

} );

function Light( color, intensity = 1 ) {

        Object3D.call( this );

        this.type = 'Light';

        this.color = new Color( color );
        this.intensity = intensity;

}

Light.prototype = Object.assign( Object.create( Object3D.prototype ), {

        constructor: Light,

        isLight: true,

        copy: function ( source ) {

                Object3D.prototype.copy.call( this, source );

                this.color.copy( source.color );
                this.intensity = source.intensity;

                return this;

        },

        toJSON: function ( meta ) {

                const data = Object3D.prototype.toJSON.call( this, meta );

                data.object.color = this.color.getHex();
                data.object.intensity = this.intensity;

                if ( this.groundColor !== undefined ) data.object.groundColor = this.groundColor.getHex();

                if ( this.distance !== undefined ) data.object.distance = this.distance;
                if ( this.angle !== undefined ) data.object.angle = this.angle;
                if ( this.decay !== undefined ) data.object.decay = this.decay;
                if ( this.penumbra !== undefined ) data.object.penumbra = this.penumbra;

                if ( this.shadow !== undefined ) data.object.shadow = this.shadow.toJSON();

                return data;

        }

} );

function HemisphereLight( skyColor, groundColor, intensity ) {

        Light.call( this, skyColor, intensity );

        this.type = 'HemisphereLight';

        this.position.copy( Object3D.DefaultUp );
        this.updateMatrix();

        this.groundColor = new Color( groundColor );

}

HemisphereLight.prototype = Object.assign( Object.create( Light.prototype ), {

        constructor: HemisphereLight,

        isHemisphereLight: true,

        copy: function ( source ) {

                Light.prototype.copy.call( this, source );

                this.groundColor.copy( source.groundColor );

                return this;

        }

} );

function LightShadow( camera ) {

        this.camera = camera;

        this.bias = 0;
        this.normalBias = 0;
        this.radius = 1;

        this.mapSize = new Vector2( 512, 512 );

        this.map = null;
        this.mapPass = null;
        this.matrix = new Matrix4();

        this.autoUpdate = true;
        this.needsUpdate = false;

        this._frustum = new Frustum();
        this._frameExtents = new Vector2( 1, 1 );

        this._viewportCount = 1;

        this._viewports = [

                new Vector4( 0, 0, 1, 1 )

        ];

}

Object.assign( LightShadow.prototype, {

        _projScreenMatrix: new Matrix4(),

        _lightPositionWorld: new Vector3(),

        _lookTarget: new Vector3(),

        getViewportCount: function () {

                return this._viewportCount;

        },

        getFrustum: function () {

                return this._frustum;

        },

        updateMatrices: function ( light ) {

                const shadowCamera = this.camera,
                        shadowMatrix = this.matrix,
                        projScreenMatrix = this._projScreenMatrix,
                        lookTarget = this._lookTarget,
                        lightPositionWorld = this._lightPositionWorld;

                lightPositionWorld.setFromMatrixPosition( light.matrixWorld );
                shadowCamera.position.copy( lightPositionWorld );

                lookTarget.setFromMatrixPosition( light.target.matrixWorld );
                shadowCamera.lookAt( lookTarget );
                shadowCamera.updateMatrixWorld();

                projScreenMatrix.multiplyMatrices( shadowCamera.projectionMatrix, shadowCamera.matrixWorldInverse );
                this._frustum.setFromProjectionMatrix( projScreenMatrix );

                shadowMatrix.set(
                        0.5, 0.0, 0.0, 0.5,
                        0.0, 0.5, 0.0, 0.5,
                        0.0, 0.0, 0.5, 0.5,
                        0.0, 0.0, 0.0, 1.0
                );

                shadowMatrix.multiply( shadowCamera.projectionMatrix );
                shadowMatrix.multiply( shadowCamera.matrixWorldInverse );

        },

        getViewport: function ( viewportIndex ) {

                return this._viewports[ viewportIndex ];

        },

        getFrameExtents: function () {

                return this._frameExtents;

        },

        copy: function ( source ) {

                this.camera = source.camera.clone();

                this.bias = source.bias;
                this.radius = source.radius;

                this.mapSize.copy( source.mapSize );

                return this;

        },

        clone: function () {

                return new this.constructor().copy( this );

        },

        toJSON: function () {

                const object = {};

                if ( this.bias !== 0 ) object.bias = this.bias;
                if ( this.normalBias !== 0 ) object.normalBias = this.normalBias;
                if ( this.radius !== 1 ) object.radius = this.radius;
                if ( this.mapSize.x !== 512 || this.mapSize.y !== 512 ) object.mapSize = this.mapSize.toArray();

                object.camera = this.camera.toJSON( false ).object;
                delete object.camera.matrix;

                return object;

        }

} );

function SpotLightShadow() {

        LightShadow.call( this, new PerspectiveCamera( 50, 1, 0.5, 500 ) );

        this.focus = 1;

}

SpotLightShadow.prototype = Object.assign( Object.create( LightShadow.prototype ), {

        constructor: SpotLightShadow,

        isSpotLightShadow: true,

        updateMatrices: function ( light ) {

                const camera = this.camera;

                const fov = MathUtils.RAD2DEG * 2 * light.angle * this.focus;
                const aspect = this.mapSize.width / this.mapSize.height;
                const far = light.distance || camera.far;

                if ( fov !== camera.fov || aspect !== camera.aspect || far !== camera.far ) {

                        camera.fov = fov;
                        camera.aspect = aspect;
                        camera.far = far;
                        camera.updateProjectionMatrix();

                }

                LightShadow.prototype.updateMatrices.call( this, light );

        }

} );

function SpotLight( color, intensity, distance, angle, penumbra, decay ) {

        Light.call( this, color, intensity );

        this.type = 'SpotLight';

        this.position.copy( Object3D.DefaultUp );
        this.updateMatrix();

        this.target = new Object3D();

        Object.defineProperty( this, 'power', {
                get: function () {

                        // intensity = power per solid angle.
                        // ref: equation (17) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
                        return this.intensity * Math.PI;

                },
                set: function ( power ) {

                        // intensity = power per solid angle.
                        // ref: equation (17) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
                        this.intensity = power / Math.PI;

                }
        } );

        this.distance = ( distance !== undefined ) ? distance : 0;
        this.angle = ( angle !== undefined ) ? angle : Math.PI / 3;
        this.penumbra = ( penumbra !== undefined ) ? penumbra : 0;
        this.decay = ( decay !== undefined ) ? decay : 1;       // for physically correct lights, should be 2.

        this.shadow = new SpotLightShadow();

}

SpotLight.prototype = Object.assign( Object.create( Light.prototype ), {

        constructor: SpotLight,

        isSpotLight: true,

        copy: function ( source ) {

                Light.prototype.copy.call( this, source );

                this.distance = source.distance;
                this.angle = source.angle;
                this.penumbra = source.penumbra;
                this.decay = source.decay;

                this.target = source.target.clone();

                this.shadow = source.shadow.clone();

                return this;

        }

} );

function PointLightShadow() {

        LightShadow.call( this, new PerspectiveCamera( 90, 1, 0.5, 500 ) );

        this._frameExtents = new Vector2( 4, 2 );

        this._viewportCount = 6;

        this._viewports = [
                // These viewports map a cube-map onto a 2D texture with the
                // following orientation:
                //
                //  xzXZ
                //   y Y
                //
                // X - Positive x direction
                // x - Negative x direction
                // Y - Positive y direction
                // y - Negative y direction
                // Z - Positive z direction
                // z - Negative z direction

                // positive X
                new Vector4( 2, 1, 1, 1 ),
                // negative X
                new Vector4( 0, 1, 1, 1 ),
                // positive Z
                new Vector4( 3, 1, 1, 1 ),
                // negative Z
                new Vector4( 1, 1, 1, 1 ),
                // positive Y
                new Vector4( 3, 0, 1, 1 ),
                // negative Y
                new Vector4( 1, 0, 1, 1 )
        ];

        this._cubeDirections = [
                new Vector3( 1, 0, 0 ), new Vector3( - 1, 0, 0 ), new Vector3( 0, 0, 1 ),
                new Vector3( 0, 0, - 1 ), new Vector3( 0, 1, 0 ), new Vector3( 0, - 1, 0 )
        ];

        this._cubeUps = [
                new Vector3( 0, 1, 0 ), new Vector3( 0, 1, 0 ), new Vector3( 0, 1, 0 ),
                new Vector3( 0, 1, 0 ), new Vector3( 0, 0, 1 ), new Vector3( 0, 0, - 1 )
        ];

}

PointLightShadow.prototype = Object.assign( Object.create( LightShadow.prototype ), {

        constructor: PointLightShadow,

        isPointLightShadow: true,

        updateMatrices: function ( light, viewportIndex = 0 ) {

                const camera = this.camera,
                        shadowMatrix = this.matrix,
                        lightPositionWorld = this._lightPositionWorld,
                        lookTarget = this._lookTarget,
                        projScreenMatrix = this._projScreenMatrix;

                lightPositionWorld.setFromMatrixPosition( light.matrixWorld );
                camera.position.copy( lightPositionWorld );

                lookTarget.copy( camera.position );
                lookTarget.add( this._cubeDirections[ viewportIndex ] );
                camera.up.copy( this._cubeUps[ viewportIndex ] );
                camera.lookAt( lookTarget );
                camera.updateMatrixWorld();

                shadowMatrix.makeTranslation( - lightPositionWorld.x, - lightPositionWorld.y, - lightPositionWorld.z );

                projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
                this._frustum.setFromProjectionMatrix( projScreenMatrix );

        }

} );

function PointLight( color, intensity, distance, decay ) {

        Light.call( this, color, intensity );

        this.type = 'PointLight';

        Object.defineProperty( this, 'power', {
                get: function () {

                        // intensity = power per solid angle.
                        // ref: equation (15) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
                        return this.intensity * 4 * Math.PI;

                },
                set: function ( power ) {

                        // intensity = power per solid angle.
                        // ref: equation (15) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
                        this.intensity = power / ( 4 * Math.PI );

                }
        } );

        this.distance = ( distance !== undefined ) ? distance : 0;
        this.decay = ( decay !== undefined ) ? decay : 1;       // for physically correct lights, should be 2.

        this.shadow = new PointLightShadow();

}

PointLight.prototype = Object.assign( Object.create( Light.prototype ), {

        constructor: PointLight,

        isPointLight: true,

        copy: function ( source ) {

                Light.prototype.copy.call( this, source );

                this.distance = source.distance;
                this.decay = source.decay;

                this.shadow = source.shadow.clone();

                return this;

        }

} );

function OrthographicCamera( left, right, top, bottom, near, far ) {

        Camera.call( this );

        this.type = 'OrthographicCamera';

        this.zoom = 1;
        this.view = null;

        this.left = ( left !== undefined ) ? left : - 1;
        this.right = ( right !== undefined ) ? right : 1;
        this.top = ( top !== undefined ) ? top : 1;
        this.bottom = ( bottom !== undefined ) ? bottom : - 1;

        this.near = ( near !== undefined ) ? near : 0.1;
        this.far = ( far !== undefined ) ? far : 2000;

        this.updateProjectionMatrix();

}

OrthographicCamera.prototype = Object.assign( Object.create( Camera.prototype ), {

        constructor: OrthographicCamera,

        isOrthographicCamera: true,

        copy: function ( source, recursive ) {

                Camera.prototype.copy.call( this, source, recursive );

                this.left = source.left;
                this.right = source.right;
                this.top = source.top;
                this.bottom = source.bottom;
                this.near = source.near;
                this.far = source.far;

                this.zoom = source.zoom;
                this.view = source.view === null ? null : Object.assign( {}, source.view );

                return this;

        },

        setViewOffset: function ( fullWidth, fullHeight, x, y, width, height ) {

                if ( this.view === null ) {

                        this.view = {
                                enabled: true,
                                fullWidth: 1,
                                fullHeight: 1,
                                offsetX: 0,
                                offsetY: 0,
                                width: 1,
                                height: 1
                        };

                }

                this.view.enabled = true;
                this.view.fullWidth = fullWidth;
                this.view.fullHeight = fullHeight;
                this.view.offsetX = x;
                this.view.offsetY = y;
                this.view.width = width;
                this.view.height = height;

                this.updateProjectionMatrix();

        },

        clearViewOffset: function () {

                if ( this.view !== null ) {

                        this.view.enabled = false;

                }

                this.updateProjectionMatrix();

        },

        updateProjectionMatrix: function () {

                const dx = ( this.right - this.left ) / ( 2 * this.zoom );
                const dy = ( this.top - this.bottom ) / ( 2 * this.zoom );
                const cx = ( this.right + this.left ) / 2;
                const cy = ( this.top + this.bottom ) / 2;

                let left = cx - dx;
                let right = cx + dx;
                let top = cy + dy;
                let bottom = cy - dy;

                if ( this.view !== null && this.view.enabled ) {

                        const scaleW = ( this.right - this.left ) / this.view.fullWidth / this.zoom;
                        const scaleH = ( this.top - this.bottom ) / this.view.fullHeight / this.zoom;

                        left += scaleW * this.view.offsetX;
                        right = left + scaleW * this.view.width;
                        top -= scaleH * this.view.offsetY;
                        bottom = top - scaleH * this.view.height;

                }

                this.projectionMatrix.makeOrthographic( left, right, top, bottom, this.near, this.far );

                this.projectionMatrixInverse.copy( this.projectionMatrix ).invert();

        },

        toJSON: function ( meta ) {

                const data = Object3D.prototype.toJSON.call( this, meta );

                data.object.zoom = this.zoom;
                data.object.left = this.left;
                data.object.right = this.right;
                data.object.top = this.top;
                data.object.bottom = this.bottom;
                data.object.near = this.near;
                data.object.far = this.far;

                if ( this.view !== null ) data.object.view = Object.assign( {}, this.view );

                return data;

        }

} );

function DirectionalLightShadow() {

        LightShadow.call( this, new OrthographicCamera( - 5, 5, 5, - 5, 0.5, 500 ) );

}

DirectionalLightShadow.prototype = Object.assign( Object.create( LightShadow.prototype ), {

        constructor: DirectionalLightShadow,

        isDirectionalLightShadow: true,

        updateMatrices: function ( light ) {

                LightShadow.prototype.updateMatrices.call( this, light );

        }

} );

function DirectionalLight( color, intensity ) {

        Light.call( this, color, intensity );

        this.type = 'DirectionalLight';

        this.position.copy( Object3D.DefaultUp );
        this.updateMatrix();

        this.target = new Object3D();

        this.shadow = new DirectionalLightShadow();

}

DirectionalLight.prototype = Object.assign( Object.create( Light.prototype ), {

        constructor: DirectionalLight,

        isDirectionalLight: true,

        copy: function ( source ) {

                Light.prototype.copy.call( this, source );

                this.target = source.target.clone();

                this.shadow = source.shadow.clone();

                return this;

        }

} );

function AmbientLight( color, intensity ) {

        Light.call( this, color, intensity );

        this.type = 'AmbientLight';

}

AmbientLight.prototype = Object.assign( Object.create( Light.prototype ), {

        constructor: AmbientLight,

        isAmbientLight: true

} );

function RectAreaLight( color, intensity, width, height ) {

        Light.call( this, color, intensity );

        this.type = 'RectAreaLight';

        this.width = ( width !== undefined ) ? width : 10;
        this.height = ( height !== undefined ) ? height : 10;

}

RectAreaLight.prototype = Object.assign( Object.create( Light.prototype ), {

        constructor: RectAreaLight,

        isRectAreaLight: true,

        copy: function ( source ) {

                Light.prototype.copy.call( this, source );

                this.width = source.width;
                this.height = source.height;

                return this;

        },

        toJSON: function ( meta ) {

                const data = Light.prototype.toJSON.call( this, meta );

                data.object.width = this.width;
                data.object.height = this.height;

                return data;

        }

} );

/**
 * Primary reference:
 *   https://graphics.stanford.edu/papers/envmap/envmap.pdf
 *
 * Secondary reference:
 *   https://www.ppsloan.org/publications/StupidSH36.pdf
 */

// 3-band SH defined by 9 coefficients

class SphericalHarmonics3 {

        constructor() {

                Object.defineProperty( this, 'isSphericalHarmonics3', { value: true } );

                this.coefficients = [];

                for ( let i = 0; i < 9; i ++ ) {

                        this.coefficients.push( new Vector3() );

                }

        }

        set( coefficients ) {

                for ( let i = 0; i < 9; i ++ ) {

                        this.coefficients[ i ].copy( coefficients[ i ] );

                }

                return this;

        }

        zero() {

                for ( let i = 0; i < 9; i ++ ) {

                        this.coefficients[ i ].set( 0, 0, 0 );

                }

                return this;

        }

        // get the radiance in the direction of the normal
        // target is a Vector3
        getAt( normal, target ) {

                // normal is assumed to be unit length

                const x = normal.x, y = normal.y, z = normal.z;

                const coeff = this.coefficients;

                // band 0
                target.copy( coeff[ 0 ] ).multiplyScalar( 0.282095 );

                // band 1
                target.addScaledVector( coeff[ 1 ], 0.488603 * y );
                target.addScaledVector( coeff[ 2 ], 0.488603 * z );
                target.addScaledVector( coeff[ 3 ], 0.488603 * x );

                // band 2
                target.addScaledVector( coeff[ 4 ], 1.092548 * ( x * y ) );
                target.addScaledVector( coeff[ 5 ], 1.092548 * ( y * z ) );
                target.addScaledVector( coeff[ 6 ], 0.315392 * ( 3.0 * z * z - 1.0 ) );
                target.addScaledVector( coeff[ 7 ], 1.092548 * ( x * z ) );
                target.addScaledVector( coeff[ 8 ], 0.546274 * ( x * x - y * y ) );

                return target;

        }

        // get the irradiance (radiance convolved with cosine lobe) in the direction of the normal
        // target is a Vector3
        // https://graphics.stanford.edu/papers/envmap/envmap.pdf
        getIrradianceAt( normal, target ) {

                // normal is assumed to be unit length

                const x = normal.x, y = normal.y, z = normal.z;

                const coeff = this.coefficients;

                // band 0
                target.copy( coeff[ 0 ] ).multiplyScalar( 0.886227 ); // π * 0.282095

                // band 1
                target.addScaledVector( coeff[ 1 ], 2.0 * 0.511664 * y ); // ( 2 * π / 3 ) * 0.488603
                target.addScaledVector( coeff[ 2 ], 2.0 * 0.511664 * z );
                target.addScaledVector( coeff[ 3 ], 2.0 * 0.511664 * x );

                // band 2
                target.addScaledVector( coeff[ 4 ], 2.0 * 0.429043 * x * y ); // ( π / 4 ) * 1.092548
                target.addScaledVector( coeff[ 5 ], 2.0 * 0.429043 * y * z );
                target.addScaledVector( coeff[ 6 ], 0.743125 * z * z - 0.247708 ); // ( π / 4 ) * 0.315392 * 3
                target.addScaledVector( coeff[ 7 ], 2.0 * 0.429043 * x * z );
                target.addScaledVector( coeff[ 8 ], 0.429043 * ( x * x - y * y ) ); // ( π / 4 ) * 0.546274

                return target;

        }

        add( sh ) {

                for ( let i = 0; i < 9; i ++ ) {

                        this.coefficients[ i ].add( sh.coefficients[ i ] );

                }

                return this;

        }

        addScaledSH( sh, s ) {

                for ( let i = 0; i < 9; i ++ ) {

                        this.coefficients[ i ].addScaledVector( sh.coefficients[ i ], s );

                }

                return this;

        }

        scale( s ) {

                for ( let i = 0; i < 9; i ++ ) {

                        this.coefficients[ i ].multiplyScalar( s );

                }

                return this;

        }

        lerp( sh, alpha ) {

                for ( let i = 0; i < 9; i ++ ) {

                        this.coefficients[ i ].lerp( sh.coefficients[ i ], alpha );

                }

                return this;

        }

        equals( sh ) {

                for ( let i = 0; i < 9; i ++ ) {

                        if ( ! this.coefficients[ i ].equals( sh.coefficients[ i ] ) ) {

                                return false;

                        }

                }

                return true;

        }

        copy( sh ) {

                return this.set( sh.coefficients );

        }

        clone() {

                return new this.constructor().copy( this );

        }

        fromArray( array, offset = 0 ) {

                const coefficients = this.coefficients;

                for ( let i = 0; i < 9; i ++ ) {

                        coefficients[ i ].fromArray( array, offset + ( i * 3 ) );

                }

                return this;

        }

        toArray( array = [], offset = 0 ) {

                const coefficients = this.coefficients;

                for ( let i = 0; i < 9; i ++ ) {

                        coefficients[ i ].toArray( array, offset + ( i * 3 ) );

                }

                return array;

        }

        // evaluate the basis functions
        // shBasis is an Array[ 9 ]
        static getBasisAt( normal, shBasis ) {

                // normal is assumed to be unit length

                const x = normal.x, y = normal.y, z = normal.z;

                // band 0
                shBasis[ 0 ] = 0.282095;

                // band 1
                shBasis[ 1 ] = 0.488603 * y;
                shBasis[ 2 ] = 0.488603 * z;
                shBasis[ 3 ] = 0.488603 * x;

                // band 2
                shBasis[ 4 ] = 1.092548 * x * y;
                shBasis[ 5 ] = 1.092548 * y * z;
                shBasis[ 6 ] = 0.315392 * ( 3 * z * z - 1 );
                shBasis[ 7 ] = 1.092548 * x * z;
                shBasis[ 8 ] = 0.546274 * ( x * x - y * y );

        }

}

function LightProbe( sh, intensity ) {

        Light.call( this, undefined, intensity );

        this.type = 'LightProbe';

        this.sh = ( sh !== undefined ) ? sh : new SphericalHarmonics3();

}

LightProbe.prototype = Object.assign( Object.create( Light.prototype ), {

        constructor: LightProbe,

        isLightProbe: true,

        copy: function ( source ) {

                Light.prototype.copy.call( this, source );

                this.sh.copy( source.sh );

                return this;

        },

        fromJSON: function ( json ) {

                this.intensity = json.intensity; // TODO: Move this bit to Light.fromJSON();
                this.sh.fromArray( json.sh );

                return this;

        },

        toJSON: function ( meta ) {

                const data = Light.prototype.toJSON.call( this, meta );

                data.object.sh = this.sh.toArray();

                return data;

        }

} );

function MaterialLoader( manager ) {

        Loader.call( this, manager );

        this.textures = {};

}

MaterialLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: MaterialLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                const scope = this;

                const loader = new FileLoader( scope.manager );
                loader.setPath( scope.path );
                loader.setRequestHeader( scope.requestHeader );
                loader.setWithCredentials( scope.withCredentials );
                loader.load( url, function ( text ) {

                        try {

                                onLoad( scope.parse( JSON.parse( text ) ) );

                        } catch ( e ) {

                                if ( onError ) {

                                        onError( e );

                                } else {

                                        console.error( e );

                                }

                                scope.manager.itemError( url );

                        }

                }, onProgress, onError );

        },

        parse: function ( json ) {

                const textures = this.textures;

                function getTexture( name ) {

                        if ( textures[ name ] === undefined ) {

                                console.warn( 'THREE.MaterialLoader: Undefined texture', name );

                        }

                        return textures[ name ];

                }

                const material = new Materials[ json.type ]();

                if ( json.uuid !== undefined ) material.uuid = json.uuid;
                if ( json.name !== undefined ) material.name = json.name;
                if ( json.color !== undefined && material.color !== undefined ) material.color.setHex( json.color );
                if ( json.roughness !== undefined ) material.roughness = json.roughness;
                if ( json.metalness !== undefined ) material.metalness = json.metalness;
                if ( json.sheen !== undefined ) material.sheen = new Color().setHex( json.sheen );
                if ( json.emissive !== undefined && material.emissive !== undefined ) material.emissive.setHex( json.emissive );
                if ( json.specular !== undefined && material.specular !== undefined ) material.specular.setHex( json.specular );
                if ( json.shininess !== undefined ) material.shininess = json.shininess;
                if ( json.clearcoat !== undefined ) material.clearcoat = json.clearcoat;
                if ( json.clearcoatRoughness !== undefined ) material.clearcoatRoughness = json.clearcoatRoughness;
                if ( json.fog !== undefined ) material.fog = json.fog;
                if ( json.flatShading !== undefined ) material.flatShading = json.flatShading;
                if ( json.blending !== undefined ) material.blending = json.blending;
                if ( json.combine !== undefined ) material.combine = json.combine;
                if ( json.side !== undefined ) material.side = json.side;
                if ( json.opacity !== undefined ) material.opacity = json.opacity;
                if ( json.transparent !== undefined ) material.transparent = json.transparent;
                if ( json.alphaTest !== undefined ) material.alphaTest = json.alphaTest;
                if ( json.depthTest !== undefined ) material.depthTest = json.depthTest;
                if ( json.depthWrite !== undefined ) material.depthWrite = json.depthWrite;
                if ( json.colorWrite !== undefined ) material.colorWrite = json.colorWrite;

                if ( json.stencilWrite !== undefined ) material.stencilWrite = json.stencilWrite;
                if ( json.stencilWriteMask !== undefined ) material.stencilWriteMask = json.stencilWriteMask;
                if ( json.stencilFunc !== undefined ) material.stencilFunc = json.stencilFunc;
                if ( json.stencilRef !== undefined ) material.stencilRef = json.stencilRef;
                if ( json.stencilFuncMask !== undefined ) material.stencilFuncMask = json.stencilFuncMask;
                if ( json.stencilFail !== undefined ) material.stencilFail = json.stencilFail;
                if ( json.stencilZFail !== undefined ) material.stencilZFail = json.stencilZFail;
                if ( json.stencilZPass !== undefined ) material.stencilZPass = json.stencilZPass;

                if ( json.wireframe !== undefined ) material.wireframe = json.wireframe;
                if ( json.wireframeLinewidth !== undefined ) material.wireframeLinewidth = json.wireframeLinewidth;
                if ( json.wireframeLinecap !== undefined ) material.wireframeLinecap = json.wireframeLinecap;
                if ( json.wireframeLinejoin !== undefined ) material.wireframeLinejoin = json.wireframeLinejoin;

                if ( json.rotation !== undefined ) material.rotation = json.rotation;

                if ( json.linewidth !== 1 ) material.linewidth = json.linewidth;
                if ( json.dashSize !== undefined ) material.dashSize = json.dashSize;
                if ( json.gapSize !== undefined ) material.gapSize = json.gapSize;
                if ( json.scale !== undefined ) material.scale = json.scale;

                if ( json.polygonOffset !== undefined ) material.polygonOffset = json.polygonOffset;
                if ( json.polygonOffsetFactor !== undefined ) material.polygonOffsetFactor = json.polygonOffsetFactor;
                if ( json.polygonOffsetUnits !== undefined ) material.polygonOffsetUnits = json.polygonOffsetUnits;

                if ( json.skinning !== undefined ) material.skinning = json.skinning;
                if ( json.morphTargets !== undefined ) material.morphTargets = json.morphTargets;
                if ( json.morphNormals !== undefined ) material.morphNormals = json.morphNormals;
                if ( json.dithering !== undefined ) material.dithering = json.dithering;

                if ( json.vertexTangents !== undefined ) material.vertexTangents = json.vertexTangents;

                if ( json.visible !== undefined ) material.visible = json.visible;

                if ( json.toneMapped !== undefined ) material.toneMapped = json.toneMapped;

                if ( json.userData !== undefined ) material.userData = json.userData;

                if ( json.vertexColors !== undefined ) {

                        if ( typeof json.vertexColors === 'number' ) {

                                material.vertexColors = ( json.vertexColors > 0 ) ? true : false;

                        } else {

                                material.vertexColors = json.vertexColors;

                        }

                }

                // Shader Material

                if ( json.uniforms !== undefined ) {

                        for ( const name in json.uniforms ) {

                                const uniform = json.uniforms[ name ];

                                material.uniforms[ name ] = {};

                                switch ( uniform.type ) {

                                        case 't':
                                                material.uniforms[ name ].value = getTexture( uniform.value );
                                                break;

                                        case 'c':
                                                material.uniforms[ name ].value = new Color().setHex( uniform.value );
                                                break;

                                        case 'v2':
                                                material.uniforms[ name ].value = new Vector2().fromArray( uniform.value );
                                                break;

                                        case 'v3':
                                                material.uniforms[ name ].value = new Vector3().fromArray( uniform.value );
                                                break;

                                        case 'v4':
                                                material.uniforms[ name ].value = new Vector4().fromArray( uniform.value );
                                                break;

                                        case 'm3':
                                                material.uniforms[ name ].value = new Matrix3().fromArray( uniform.value );
                                                break;

                                        case 'm4':
                                                material.uniforms[ name ].value = new Matrix4().fromArray( uniform.value );
                                                break;

                                        default:
                                                material.uniforms[ name ].value = uniform.value;

                                }

                        }

                }

                if ( json.defines !== undefined ) material.defines = json.defines;
                if ( json.vertexShader !== undefined ) material.vertexShader = json.vertexShader;
                if ( json.fragmentShader !== undefined ) material.fragmentShader = json.fragmentShader;

                if ( json.extensions !== undefined ) {

                        for ( const key in json.extensions ) {

                                material.extensions[ key ] = json.extensions[ key ];

                        }

                }

                // Deprecated

                if ( json.shading !== undefined ) material.flatShading = json.shading === 1; // THREE.FlatShading

                // for PointsMaterial

                if ( json.size !== undefined ) material.size = json.size;
                if ( json.sizeAttenuation !== undefined ) material.sizeAttenuation = json.sizeAttenuation;

                // maps

                if ( json.map !== undefined ) material.map = getTexture( json.map );
                if ( json.matcap !== undefined ) material.matcap = getTexture( json.matcap );

                if ( json.alphaMap !== undefined ) material.alphaMap = getTexture( json.alphaMap );

                if ( json.bumpMap !== undefined ) material.bumpMap = getTexture( json.bumpMap );
                if ( json.bumpScale !== undefined ) material.bumpScale = json.bumpScale;

                if ( json.normalMap !== undefined ) material.normalMap = getTexture( json.normalMap );
                if ( json.normalMapType !== undefined ) material.normalMapType = json.normalMapType;
                if ( json.normalScale !== undefined ) {

                        let normalScale = json.normalScale;

                        if ( Array.isArray( normalScale ) === false ) {

                                // Blender exporter used to export a scalar. See #7459

                                normalScale = [ normalScale, normalScale ];

                        }

                        material.normalScale = new Vector2().fromArray( normalScale );

                }

                if ( json.displacementMap !== undefined ) material.displacementMap = getTexture( json.displacementMap );
                if ( json.displacementScale !== undefined ) material.displacementScale = json.displacementScale;
                if ( json.displacementBias !== undefined ) material.displacementBias = json.displacementBias;

                if ( json.roughnessMap !== undefined ) material.roughnessMap = getTexture( json.roughnessMap );
                if ( json.metalnessMap !== undefined ) material.metalnessMap = getTexture( json.metalnessMap );

                if ( json.emissiveMap !== undefined ) material.emissiveMap = getTexture( json.emissiveMap );
                if ( json.emissiveIntensity !== undefined ) material.emissiveIntensity = json.emissiveIntensity;

                if ( json.specularMap !== undefined ) material.specularMap = getTexture( json.specularMap );

                if ( json.envMap !== undefined ) material.envMap = getTexture( json.envMap );
                if ( json.envMapIntensity !== undefined ) material.envMapIntensity = json.envMapIntensity;

                if ( json.reflectivity !== undefined ) material.reflectivity = json.reflectivity;
                if ( json.refractionRatio !== undefined ) material.refractionRatio = json.refractionRatio;

                if ( json.lightMap !== undefined ) material.lightMap = getTexture( json.lightMap );
                if ( json.lightMapIntensity !== undefined ) material.lightMapIntensity = json.lightMapIntensity;

                if ( json.aoMap !== undefined ) material.aoMap = getTexture( json.aoMap );
                if ( json.aoMapIntensity !== undefined ) material.aoMapIntensity = json.aoMapIntensity;

                if ( json.gradientMap !== undefined ) material.gradientMap = getTexture( json.gradientMap );

                if ( json.clearcoatMap !== undefined ) material.clearcoatMap = getTexture( json.clearcoatMap );
                if ( json.clearcoatRoughnessMap !== undefined ) material.clearcoatRoughnessMap = getTexture( json.clearcoatRoughnessMap );
                if ( json.clearcoatNormalMap !== undefined ) material.clearcoatNormalMap = getTexture( json.clearcoatNormalMap );
                if ( json.clearcoatNormalScale !== undefined ) material.clearcoatNormalScale = new Vector2().fromArray( json.clearcoatNormalScale );

                if ( json.transmission !== undefined ) material.transmission = json.transmission;
                if ( json.transmissionMap !== undefined ) material.transmissionMap = getTexture( json.transmissionMap );

                return material;

        },

        setTextures: function ( value ) {

                this.textures = value;
                return this;

        }

} );

const LoaderUtils = {

        decodeText: function ( array ) {

                if ( typeof TextDecoder !== 'undefined' ) {

                        return new TextDecoder().decode( array );

                }

                // Avoid the String.fromCharCode.apply(null, array) shortcut, which
                // throws a "maximum call stack size exceeded" error for large arrays.

                let s = '';

                for ( let i = 0, il = array.length; i < il; i ++ ) {

                        // Implicitly assumes little-endian.
                        s += String.fromCharCode( array[ i ] );

                }

                try {

                        // merges multi-byte utf-8 characters.

                        return decodeURIComponent( escape( s ) );

                } catch ( e ) { // see #16358

                        return s;

                }

        },

        extractUrlBase: function ( url ) {

                const index = url.lastIndexOf( '/' );

                if ( index === - 1 ) return './';

                return url.substr( 0, index + 1 );

        }

};

function InstancedBufferGeometry() {

        BufferGeometry.call( this );

        this.type = 'InstancedBufferGeometry';
        this.instanceCount = Infinity;

}

InstancedBufferGeometry.prototype = Object.assign( Object.create( BufferGeometry.prototype ), {

        constructor: InstancedBufferGeometry,

        isInstancedBufferGeometry: true,

        copy: function ( source ) {

                BufferGeometry.prototype.copy.call( this, source );

                this.instanceCount = source.instanceCount;

                return this;

        },

        clone: function () {

                return new this.constructor().copy( this );

        },

        toJSON: function () {

                const data = BufferGeometry.prototype.toJSON.call( this );

                data.instanceCount = this.instanceCount;

                data.isInstancedBufferGeometry = true;

                return data;

        }

} );

function InstancedBufferAttribute( array, itemSize, normalized, meshPerAttribute ) {

        if ( typeof ( normalized ) === 'number' ) {

                meshPerAttribute = normalized;

                normalized = false;

                console.error( 'THREE.InstancedBufferAttribute: The constructor now expects normalized as the third argument.' );

        }

        BufferAttribute.call( this, array, itemSize, normalized );

        this.meshPerAttribute = meshPerAttribute || 1;

}

InstancedBufferAttribute.prototype = Object.assign( Object.create( BufferAttribute.prototype ), {

        constructor: InstancedBufferAttribute,

        isInstancedBufferAttribute: true,

        copy: function ( source ) {

                BufferAttribute.prototype.copy.call( this, source );

                this.meshPerAttribute = source.meshPerAttribute;

                return this;

        },

        toJSON: function ()     {

                const data = BufferAttribute.prototype.toJSON.call( this );

                data.meshPerAttribute = this.meshPerAttribute;

                data.isInstancedBufferAttribute = true;

                return data;

        }

} );

function BufferGeometryLoader( manager ) {

        Loader.call( this, manager );

}

BufferGeometryLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: BufferGeometryLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                const scope = this;

                const loader = new FileLoader( scope.manager );
                loader.setPath( scope.path );
                loader.setRequestHeader( scope.requestHeader );
                loader.setWithCredentials( scope.withCredentials );
                loader.load( url, function ( text ) {

                        try {

                                onLoad( scope.parse( JSON.parse( text ) ) );

                        } catch ( e ) {

                                if ( onError ) {

                                        onError( e );

                                } else {

                                        console.error( e );

                                }

                                scope.manager.itemError( url );

                        }

                }, onProgress, onError );

        },

        parse: function ( json ) {

                const interleavedBufferMap = {};
                const arrayBufferMap = {};

                function getInterleavedBuffer( json, uuid ) {

                        if ( interleavedBufferMap[ uuid ] !== undefined ) return interleavedBufferMap[ uuid ];

                        const interleavedBuffers = json.interleavedBuffers;
                        const interleavedBuffer = interleavedBuffers[ uuid ];

                        const buffer = getArrayBuffer( json, interleavedBuffer.buffer );

                        const array = getTypedArray( interleavedBuffer.type, buffer );
                        const ib = new InterleavedBuffer( array, interleavedBuffer.stride );
                        ib.uuid = interleavedBuffer.uuid;

                        interleavedBufferMap[ uuid ] = ib;

                        return ib;

                }

                function getArrayBuffer( json, uuid ) {

                        if ( arrayBufferMap[ uuid ] !== undefined ) return arrayBufferMap[ uuid ];

                        const arrayBuffers = json.arrayBuffers;
                        const arrayBuffer = arrayBuffers[ uuid ];

                        const ab = new Uint32Array( arrayBuffer ).buffer;

                        arrayBufferMap[ uuid ] = ab;

                        return ab;

                }

                const geometry = json.isInstancedBufferGeometry ? new InstancedBufferGeometry() : new BufferGeometry();

                const index = json.data.index;

                if ( index !== undefined ) {

                        const typedArray = getTypedArray( index.type, index.array );
                        geometry.setIndex( new BufferAttribute( typedArray, 1 ) );

                }

                const attributes = json.data.attributes;

                for ( const key in attributes ) {

                        const attribute = attributes[ key ];
                        let bufferAttribute;

                        if ( attribute.isInterleavedBufferAttribute ) {

                                const interleavedBuffer = getInterleavedBuffer( json.data, attribute.data );
                                bufferAttribute = new InterleavedBufferAttribute( interleavedBuffer, attribute.itemSize, attribute.offset, attribute.normalized );

                        } else {

                                const typedArray = getTypedArray( attribute.type, attribute.array );
                                const bufferAttributeConstr = attribute.isInstancedBufferAttribute ? InstancedBufferAttribute : BufferAttribute;
                                bufferAttribute = new bufferAttributeConstr( typedArray, attribute.itemSize, attribute.normalized );

                        }

                        if ( attribute.name !== undefined ) bufferAttribute.name = attribute.name;
                        geometry.setAttribute( key, bufferAttribute );

                }

                const morphAttributes = json.data.morphAttributes;

                if ( morphAttributes ) {

                        for ( const key in morphAttributes ) {

                                const attributeArray = morphAttributes[ key ];

                                const array = [];

                                for ( let i = 0, il = attributeArray.length; i < il; i ++ ) {

                                        const attribute = attributeArray[ i ];
                                        let bufferAttribute;

                                        if ( attribute.isInterleavedBufferAttribute ) {

                                                const interleavedBuffer = getInterleavedBuffer( json.data, attribute.data );
                                                bufferAttribute = new InterleavedBufferAttribute( interleavedBuffer, attribute.itemSize, attribute.offset, attribute.normalized );

                                        } else {

                                                const typedArray = getTypedArray( attribute.type, attribute.array );
                                                bufferAttribute = new BufferAttribute( typedArray, attribute.itemSize, attribute.normalized );

                                        }

                                        if ( attribute.name !== undefined ) bufferAttribute.name = attribute.name;
                                        array.push( bufferAttribute );

                                }

                                geometry.morphAttributes[ key ] = array;

                        }

                }

                const morphTargetsRelative = json.data.morphTargetsRelative;

                if ( morphTargetsRelative ) {

                        geometry.morphTargetsRelative = true;

                }

                const groups = json.data.groups || json.data.drawcalls || json.data.offsets;

                if ( groups !== undefined ) {

                        for ( let i = 0, n = groups.length; i !== n; ++ i ) {

                                const group = groups[ i ];

                                geometry.addGroup( group.start, group.count, group.materialIndex );

                        }

                }

                const boundingSphere = json.data.boundingSphere;

                if ( boundingSphere !== undefined ) {

                        const center = new Vector3();

                        if ( boundingSphere.center !== undefined ) {

                                center.fromArray( boundingSphere.center );

                        }

                        geometry.boundingSphere = new Sphere( center, boundingSphere.radius );

                }

                if ( json.name ) geometry.name = json.name;
                if ( json.userData ) geometry.userData = json.userData;

                return geometry;

        }

} );

class ObjectLoader extends Loader {

        constructor( manager ) {

                super( manager );

        }

        load( url, onLoad, onProgress, onError ) {

                const scope = this;

                const path = ( this.path === '' ) ? LoaderUtils.extractUrlBase( url ) : this.path;
                this.resourcePath = this.resourcePath || path;

                const loader = new FileLoader( this.manager );
                loader.setPath( this.path );
                loader.setRequestHeader( this.requestHeader );
                loader.setWithCredentials( this.withCredentials );
                loader.load( url, function ( text ) {

                        let json = null;

                        try {

                                json = JSON.parse( text );

                        } catch ( error ) {

                                if ( onError !== undefined ) onError( error );

                                console.error( 'THREE:ObjectLoader: Can\'t parse ' + url + '.', error.message );

                                return;

                        }

                        const metadata = json.metadata;

                        if ( metadata === undefined || metadata.type === undefined || metadata.type.toLowerCase() === 'geometry' ) {

                                console.error( 'THREE.ObjectLoader: Can\'t load ' + url );
                                return;

                        }

                        scope.parse( json, onLoad );

                }, onProgress, onError );

        }

        parse( json, onLoad ) {

                const animations = this.parseAnimations( json.animations );
                const shapes = this.parseShapes( json.shapes );
                const geometries = this.parseGeometries( json.geometries, shapes );

                const images = this.parseImages( json.images, function () {

                        if ( onLoad !== undefined ) onLoad( object );

                } );

                const textures = this.parseTextures( json.textures, images );
                const materials = this.parseMaterials( json.materials, textures );

                const object = this.parseObject( json.object, geometries, materials, animations );
                const skeletons = this.parseSkeletons( json.skeletons, object );

                this.bindSkeletons( object, skeletons );

                //

                if ( onLoad !== undefined ) {

                        let hasImages = false;

                        for ( const uuid in images ) {

                                if ( images[ uuid ] instanceof HTMLImageElement ) {

                                        hasImages = true;
                                        break;

                                }

                        }

                        if ( hasImages === false ) onLoad( object );

                }

                return object;

        }

        parseShapes( json ) {

                const shapes = {};

                if ( json !== undefined ) {

                        for ( let i = 0, l = json.length; i < l; i ++ ) {

                                const shape = new Shape().fromJSON( json[ i ] );

                                shapes[ shape.uuid ] = shape;

                        }

                }

                return shapes;

        }

        parseSkeletons( json, object ) {

                const skeletons = {};
                const bones = {};

                // generate bone lookup table

                object.traverse( function ( child ) {

                        if ( child.isBone ) bones[ child.uuid ] = child;

                } );

                // create skeletons

                if ( json !== undefined ) {

                        for ( let i = 0, l = json.length; i < l; i ++ ) {

                                const skeleton = new Skeleton().fromJSON( json[ i ], bones );

                                skeletons[ skeleton.uuid ] = skeleton;

                        }

                }

                return skeletons;

        }

        parseGeometries( json, shapes ) {

                const geometries = {};
                let geometryShapes;

                if ( json !== undefined ) {

                        const bufferGeometryLoader = new BufferGeometryLoader();

                        for ( let i = 0, l = json.length; i < l; i ++ ) {

                                let geometry;
                                const data = json[ i ];

                                switch ( data.type ) {

                                        case 'PlaneGeometry':
                                        case 'PlaneBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.width,
                                                        data.height,
                                                        data.widthSegments,
                                                        data.heightSegments
                                                );

                                                break;

                                        case 'BoxGeometry':
                                        case 'BoxBufferGeometry':
                                        case 'CubeGeometry': // backwards compatible

                                                geometry = new Geometries[ data.type ](
                                                        data.width,
                                                        data.height,
                                                        data.depth,
                                                        data.widthSegments,
                                                        data.heightSegments,
                                                        data.depthSegments
                                                );

                                                break;

                                        case 'CircleGeometry':
                                        case 'CircleBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.radius,
                                                        data.segments,
                                                        data.thetaStart,
                                                        data.thetaLength
                                                );

                                                break;

                                        case 'CylinderGeometry':
                                        case 'CylinderBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.radiusTop,
                                                        data.radiusBottom,
                                                        data.height,
                                                        data.radialSegments,
                                                        data.heightSegments,
                                                        data.openEnded,
                                                        data.thetaStart,
                                                        data.thetaLength
                                                );

                                                break;

                                        case 'ConeGeometry':
                                        case 'ConeBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.radius,
                                                        data.height,
                                                        data.radialSegments,
                                                        data.heightSegments,
                                                        data.openEnded,
                                                        data.thetaStart,
                                                        data.thetaLength
                                                );

                                                break;

                                        case 'SphereGeometry':
                                        case 'SphereBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.radius,
                                                        data.widthSegments,
                                                        data.heightSegments,
                                                        data.phiStart,
                                                        data.phiLength,
                                                        data.thetaStart,
                                                        data.thetaLength
                                                );

                                                break;

                                        case 'DodecahedronGeometry':
                                        case 'DodecahedronBufferGeometry':
                                        case 'IcosahedronGeometry':
                                        case 'IcosahedronBufferGeometry':
                                        case 'OctahedronGeometry':
                                        case 'OctahedronBufferGeometry':
                                        case 'TetrahedronGeometry':
                                        case 'TetrahedronBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.radius,
                                                        data.detail
                                                );

                                                break;

                                        case 'RingGeometry':
                                        case 'RingBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.innerRadius,
                                                        data.outerRadius,
                                                        data.thetaSegments,
                                                        data.phiSegments,
                                                        data.thetaStart,
                                                        data.thetaLength
                                                );

                                                break;

                                        case 'TorusGeometry':
                                        case 'TorusBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.radius,
                                                        data.tube,
                                                        data.radialSegments,
                                                        data.tubularSegments,
                                                        data.arc
                                                );

                                                break;

                                        case 'TorusKnotGeometry':
                                        case 'TorusKnotBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.radius,
                                                        data.tube,
                                                        data.tubularSegments,
                                                        data.radialSegments,
                                                        data.p,
                                                        data.q
                                                );

                                                break;

                                        case 'TubeGeometry':
                                        case 'TubeBufferGeometry':

                                                // This only works for built-in curves (e.g. CatmullRomCurve3).
                                                // User defined curves or instances of CurvePath will not be deserialized.
                                                geometry = new Geometries[ data.type ](
                                                        new Curves[ data.path.type ]().fromJSON( data.path ),
                                                        data.tubularSegments,
                                                        data.radius,
                                                        data.radialSegments,
                                                        data.closed
                                                );

                                                break;

                                        case 'LatheGeometry':
                                        case 'LatheBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.points,
                                                        data.segments,
                                                        data.phiStart,
                                                        data.phiLength
                                                );

                                                break;

                                        case 'PolyhedronGeometry':
                                        case 'PolyhedronBufferGeometry':

                                                geometry = new Geometries[ data.type ](
                                                        data.vertices,
                                                        data.indices,
                                                        data.radius,
                                                        data.details
                                                );

                                                break;

                                        case 'ShapeGeometry':
                                        case 'ShapeBufferGeometry':

                                                geometryShapes = [];

                                                for ( let j = 0, jl = data.shapes.length; j < jl; j ++ ) {

                                                        const shape = shapes[ data.shapes[ j ] ];

                                                        geometryShapes.push( shape );

                                                }

                                                geometry = new Geometries[ data.type ](
                                                        geometryShapes,
                                                        data.curveSegments
                                                );

                                                break;


                                        case 'ExtrudeGeometry':
                                        case 'ExtrudeBufferGeometry':

                                                geometryShapes = [];

                                                for ( let j = 0, jl = data.shapes.length; j < jl; j ++ ) {

                                                        const shape = shapes[ data.shapes[ j ] ];

                                                        geometryShapes.push( shape );

                                                }

                                                const extrudePath = data.options.extrudePath;

                                                if ( extrudePath !== undefined ) {

                                                        data.options.extrudePath = new Curves[ extrudePath.type ]().fromJSON( extrudePath );

                                                }

                                                geometry = new Geometries[ data.type ](
                                                        geometryShapes,
                                                        data.options
                                                );

                                                break;

                                        case 'BufferGeometry':
                                        case 'InstancedBufferGeometry':

                                                geometry = bufferGeometryLoader.parse( data );

                                                break;

                                        case 'Geometry':

                                                console.error( 'THREE.ObjectLoader: Loading "Geometry" is not supported anymore.' );

                                                break;

                                        default:

                                                console.warn( 'THREE.ObjectLoader: Unsupported geometry type "' + data.type + '"' );

                                                continue;

                                }

                                geometry.uuid = data.uuid;

                                if ( data.name !== undefined ) geometry.name = data.name;
                                if ( geometry.isBufferGeometry === true && data.userData !== undefined ) geometry.userData = data.userData;

                                geometries[ data.uuid ] = geometry;

                        }

                }

                return geometries;

        }

        parseMaterials( json, textures ) {

                const cache = {}; // MultiMaterial
                const materials = {};

                if ( json !== undefined ) {

                        const loader = new MaterialLoader();
                        loader.setTextures( textures );

                        for ( let i = 0, l = json.length; i < l; i ++ ) {

                                const data = json[ i ];

                                if ( data.type === 'MultiMaterial' ) {

                                        // Deprecated

                                        const array = [];

                                        for ( let j = 0; j < data.materials.length; j ++ ) {

                                                const material = data.materials[ j ];

                                                if ( cache[ material.uuid ] === undefined ) {

                                                        cache[ material.uuid ] = loader.parse( material );

                                                }

                                                array.push( cache[ material.uuid ] );

                                        }

                                        materials[ data.uuid ] = array;

                                } else {

                                        if ( cache[ data.uuid ] === undefined ) {

                                                cache[ data.uuid ] = loader.parse( data );

                                        }

                                        materials[ data.uuid ] = cache[ data.uuid ];

                                }

                        }

                }

                return materials;

        }

        parseAnimations( json ) {

                const animations = {};

                if ( json !== undefined ) {

                        for ( let i = 0; i < json.length; i ++ ) {

                                const data = json[ i ];

                                const clip = AnimationClip.parse( data );

                                animations[ clip.uuid ] = clip;

                        }

                }

                return animations;

        }

        parseImages( json, onLoad ) {

                const scope = this;
                const images = {};

                let loader;

                function loadImage( url ) {

                        scope.manager.itemStart( url );

                        return loader.load( url, function () {

                                scope.manager.itemEnd( url );

                        }, undefined, function () {

                                scope.manager.itemError( url );
                                scope.manager.itemEnd( url );

                        } );

                }

                function deserializeImage( image ) {

                        if ( typeof image === 'string' ) {

                                const url = image;

                                const path = /^(\/\/)|([a-z]+:(\/\/)?)/i.test( url ) ? url : scope.resourcePath + url;

                                return loadImage( path );

                        } else {

                                if ( image.data ) {

                                        return {
                                                data: getTypedArray( image.type, image.data ),
                                                width: image.width,
                                                height: image.height
                                        };

                                } else {

                                        return null;

                                }

                        }

                }

                if ( json !== undefined && json.length > 0 ) {

                        const manager = new LoadingManager( onLoad );

                        loader = new ImageLoader( manager );
                        loader.setCrossOrigin( this.crossOrigin );

                        for ( let i = 0, il = json.length; i < il; i ++ ) {

                                const image = json[ i ];
                                const url = image.url;

                                if ( Array.isArray( url ) ) {

                                        // load array of images e.g CubeTexture

                                        images[ image.uuid ] = [];

                                        for ( let j = 0, jl = url.length; j < jl; j ++ ) {

                                                const currentUrl = url[ j ];

                                                const deserializedImage = deserializeImage( currentUrl );

                                                if ( deserializedImage !== null ) {

                                                        if ( deserializedImage instanceof HTMLImageElement ) {

                                                                images[ image.uuid ].push( deserializedImage );

                                                        } else {

                                                                // special case: handle array of data textures for cube textures

                                                                images[ image.uuid ].push( new DataTexture( deserializedImage.data, deserializedImage.width, deserializedImage.height ) );

                                                        }

                                                }

                                        }

                                } else {

                                        // load single image

                                        const deserializedImage = deserializeImage( image.url );

                                        if ( deserializedImage !== null ) {

                                                images[ image.uuid ] = deserializedImage;

                                        }

                                }

                        }

                }

                return images;

        }

        parseTextures( json, images ) {

                function parseConstant( value, type ) {

                        if ( typeof value === 'number' ) return value;

                        console.warn( 'THREE.ObjectLoader.parseTexture: Constant should be in numeric form.', value );

                        return type[ value ];

                }

                const textures = {};

                if ( json !== undefined ) {

                        for ( let i = 0, l = json.length; i < l; i ++ ) {

                                const data = json[ i ];

                                if ( data.image === undefined ) {

                                        console.warn( 'THREE.ObjectLoader: No "image" specified for', data.uuid );

                                }

                                if ( images[ data.image ] === undefined ) {

                                        console.warn( 'THREE.ObjectLoader: Undefined image', data.image );

                                }

                                let texture;
                                const image = images[ data.image ];

                                if ( Array.isArray( image ) ) {

                                        texture = new CubeTexture( image );

                                        if ( image.length === 6 ) texture.needsUpdate = true;

                                } else {

                                        if ( image && image.data ) {

                                                texture = new DataTexture( image.data, image.width, image.height );

                                        } else {

                                                texture = new Texture( image );

                                        }

                                        if ( image ) texture.needsUpdate = true; // textures can have undefined image data

                                }

                                texture.uuid = data.uuid;

                                if ( data.name !== undefined ) texture.name = data.name;

                                if ( data.mapping !== undefined ) texture.mapping = parseConstant( data.mapping, TEXTURE_MAPPING );

                                if ( data.offset !== undefined ) texture.offset.fromArray( data.offset );
                                if ( data.repeat !== undefined ) texture.repeat.fromArray( data.repeat );
                                if ( data.center !== undefined ) texture.center.fromArray( data.center );
                                if ( data.rotation !== undefined ) texture.rotation = data.rotation;

                                if ( data.wrap !== undefined ) {

                                        texture.wrapS = parseConstant( data.wrap[ 0 ], TEXTURE_WRAPPING );
                                        texture.wrapT = parseConstant( data.wrap[ 1 ], TEXTURE_WRAPPING );

                                }

                                if ( data.format !== undefined ) texture.format = data.format;
                                if ( data.type !== undefined ) texture.type = data.type;
                                if ( data.encoding !== undefined ) texture.encoding = data.encoding;

                                if ( data.minFilter !== undefined ) texture.minFilter = parseConstant( data.minFilter, TEXTURE_FILTER );
                                if ( data.magFilter !== undefined ) texture.magFilter = parseConstant( data.magFilter, TEXTURE_FILTER );
                                if ( data.anisotropy !== undefined ) texture.anisotropy = data.anisotropy;

                                if ( data.flipY !== undefined ) texture.flipY = data.flipY;

                                if ( data.premultiplyAlpha !== undefined ) texture.premultiplyAlpha = data.premultiplyAlpha;
                                if ( data.unpackAlignment !== undefined ) texture.unpackAlignment = data.unpackAlignment;

                                textures[ data.uuid ] = texture;

                        }

                }

                return textures;

        }

        parseObject( data, geometries, materials, animations ) {

                let object;

                function getGeometry( name ) {

                        if ( geometries[ name ] === undefined ) {

                                console.warn( 'THREE.ObjectLoader: Undefined geometry', name );

                        }

                        return geometries[ name ];

                }

                function getMaterial( name ) {

                        if ( name === undefined ) return undefined;

                        if ( Array.isArray( name ) ) {

                                const array = [];

                                for ( let i = 0, l = name.length; i < l; i ++ ) {

                                        const uuid = name[ i ];

                                        if ( materials[ uuid ] === undefined ) {

                                                console.warn( 'THREE.ObjectLoader: Undefined material', uuid );

                                        }

                                        array.push( materials[ uuid ] );

                                }

                                return array;

                        }

                        if ( materials[ name ] === undefined ) {

                                console.warn( 'THREE.ObjectLoader: Undefined material', name );

                        }

                        return materials[ name ];

                }

                let geometry, material;

                switch ( data.type ) {

                        case 'Scene':

                                object = new Scene();

                                if ( data.background !== undefined ) {

                                        if ( Number.isInteger( data.background ) ) {

                                                object.background = new Color( data.background );

                                        }

                                }

                                if ( data.fog !== undefined ) {

                                        if ( data.fog.type === 'Fog' ) {

                                                object.fog = new Fog( data.fog.color, data.fog.near, data.fog.far );

                                        } else if ( data.fog.type === 'FogExp2' ) {

                                                object.fog = new FogExp2( data.fog.color, data.fog.density );

                                        }

                                }

                                break;

                        case 'PerspectiveCamera':

                                object = new PerspectiveCamera( data.fov, data.aspect, data.near, data.far );

                                if ( data.focus !== undefined ) object.focus = data.focus;
                                if ( data.zoom !== undefined ) object.zoom = data.zoom;
                                if ( data.filmGauge !== undefined ) object.filmGauge = data.filmGauge;
                                if ( data.filmOffset !== undefined ) object.filmOffset = data.filmOffset;
                                if ( data.view !== undefined ) object.view = Object.assign( {}, data.view );

                                break;

                        case 'OrthographicCamera':

                                object = new OrthographicCamera( data.left, data.right, data.top, data.bottom, data.near, data.far );

                                if ( data.zoom !== undefined ) object.zoom = data.zoom;
                                if ( data.view !== undefined ) object.view = Object.assign( {}, data.view );

                                break;

                        case 'AmbientLight':

                                object = new AmbientLight( data.color, data.intensity );

                                break;

                        case 'DirectionalLight':

                                object = new DirectionalLight( data.color, data.intensity );

                                break;

                        case 'PointLight':

                                object = new PointLight( data.color, data.intensity, data.distance, data.decay );

                                break;

                        case 'RectAreaLight':

                                object = new RectAreaLight( data.color, data.intensity, data.width, data.height );

                                break;

                        case 'SpotLight':

                                object = new SpotLight( data.color, data.intensity, data.distance, data.angle, data.penumbra, data.decay );

                                break;

                        case 'HemisphereLight':

                                object = new HemisphereLight( data.color, data.groundColor, data.intensity );

                                break;

                        case 'LightProbe':

                                object = new LightProbe().fromJSON( data );

                                break;

                        case 'SkinnedMesh':

                                geometry = getGeometry( data.geometry );
                                material = getMaterial( data.material );

                                object = new SkinnedMesh( geometry, material );

                                if ( data.bindMode !== undefined ) object.bindMode = data.bindMode;
                                if ( data.bindMatrix !== undefined ) object.bindMatrix.fromArray( data.bindMatrix );
                                if ( data.skeleton !== undefined ) object.skeleton = data.skeleton;

                                break;

                        case 'Mesh':

                                geometry = getGeometry( data.geometry );
                                material = getMaterial( data.material );

                                object = new Mesh( geometry, material );

                                break;

                        case 'InstancedMesh':

                                geometry = getGeometry( data.geometry );
                                material = getMaterial( data.material );
                                const count = data.count;
                                const instanceMatrix = data.instanceMatrix;

                                object = new InstancedMesh( geometry, material, count );
                                object.instanceMatrix = new BufferAttribute( new Float32Array( instanceMatrix.array ), 16 );

                                break;

                        case 'LOD':

                                object = new LOD();

                                break;

                        case 'Line':

                                object = new Line( getGeometry( data.geometry ), getMaterial( data.material ), data.mode );

                                break;

                        case 'LineLoop':

                                object = new LineLoop( getGeometry( data.geometry ), getMaterial( data.material ) );

                                break;

                        case 'LineSegments':

                                object = new LineSegments( getGeometry( data.geometry ), getMaterial( data.material ) );

                                break;

                        case 'PointCloud':
                        case 'Points':

                                object = new Points( getGeometry( data.geometry ), getMaterial( data.material ) );

                                break;

                        case 'Sprite':

                                object = new Sprite( getMaterial( data.material ) );

                                break;

                        case 'Group':

                                object = new Group();

                                break;

                        case 'Bone':

                                object = new Bone();

                                break;

                        default:

                                object = new Object3D();

                }

                object.uuid = data.uuid;

                if ( data.name !== undefined ) object.name = data.name;

                if ( data.matrix !== undefined ) {

                        object.matrix.fromArray( data.matrix );

                        if ( data.matrixAutoUpdate !== undefined ) object.matrixAutoUpdate = data.matrixAutoUpdate;
                        if ( object.matrixAutoUpdate ) object.matrix.decompose( object.position, object.quaternion, object.scale );

                } else {

                        if ( data.position !== undefined ) object.position.fromArray( data.position );
                        if ( data.rotation !== undefined ) object.rotation.fromArray( data.rotation );
                        if ( data.quaternion !== undefined ) object.quaternion.fromArray( data.quaternion );
                        if ( data.scale !== undefined ) object.scale.fromArray( data.scale );

                }

                if ( data.castShadow !== undefined ) object.castShadow = data.castShadow;
                if ( data.receiveShadow !== undefined ) object.receiveShadow = data.receiveShadow;

                if ( data.shadow ) {

                        if ( data.shadow.bias !== undefined ) object.shadow.bias = data.shadow.bias;
                        if ( data.shadow.normalBias !== undefined ) object.shadow.normalBias = data.shadow.normalBias;
                        if ( data.shadow.radius !== undefined ) object.shadow.radius = data.shadow.radius;
                        if ( data.shadow.mapSize !== undefined ) object.shadow.mapSize.fromArray( data.shadow.mapSize );
                        if ( data.shadow.camera !== undefined ) object.shadow.camera = this.parseObject( data.shadow.camera );

                }

                if ( data.visible !== undefined ) object.visible = data.visible;
                if ( data.frustumCulled !== undefined ) object.frustumCulled = data.frustumCulled;
                if ( data.renderOrder !== undefined ) object.renderOrder = data.renderOrder;
                if ( data.userData !== undefined ) object.userData = data.userData;
                if ( data.layers !== undefined ) object.layers.mask = data.layers;

                if ( data.children !== undefined ) {

                        const children = data.children;

                        for ( let i = 0; i < children.length; i ++ ) {

                                object.add( this.parseObject( children[ i ], geometries, materials, animations ) );

                        }

                }

                if ( data.animations !== undefined ) {

                        const objectAnimations = data.animations;

                        for ( let i = 0; i < objectAnimations.length; i ++ ) {

                                const uuid = objectAnimations[ i ];

                                object.animations.push( animations[ uuid ] );

                        }

                }

                if ( data.type === 'LOD' ) {

                        if ( data.autoUpdate !== undefined ) object.autoUpdate = data.autoUpdate;

                        const levels = data.levels;

                        for ( let l = 0; l < levels.length; l ++ ) {

                                const level = levels[ l ];
                                const child = object.getObjectByProperty( 'uuid', level.object );

                                if ( child !== undefined ) {

                                        object.addLevel( child, level.distance );

                                }

                        }

                }

                return object;

        }

        bindSkeletons( object, skeletons ) {

                if ( Object.keys( skeletons ).length === 0 ) return;

                object.traverse( function ( child ) {

                        if ( child.isSkinnedMesh === true && child.skeleton !== undefined ) {

                                const skeleton = skeletons[ child.skeleton ];

                                if ( skeleton === undefined ) {

                                        console.warn( 'THREE.ObjectLoader: No skeleton found with UUID:', child.skeleton );

                                } else {

                                        child.bind( skeleton, child.bindMatrix );

                                }

                        }

                } );

        }

        /* DEPRECATED */

        setTexturePath( value ) {

                console.warn( 'THREE.ObjectLoader: .setTexturePath() has been renamed to .setResourcePath().' );
                return this.setResourcePath( value );

        }

}

const TEXTURE_MAPPING = {
        UVMapping: UVMapping,
        CubeReflectionMapping: CubeReflectionMapping,
        CubeRefractionMapping: CubeRefractionMapping,
        EquirectangularReflectionMapping: EquirectangularReflectionMapping,
        EquirectangularRefractionMapping: EquirectangularRefractionMapping,
        CubeUVReflectionMapping: CubeUVReflectionMapping,
        CubeUVRefractionMapping: CubeUVRefractionMapping
};

const TEXTURE_WRAPPING = {
        RepeatWrapping: RepeatWrapping,
        ClampToEdgeWrapping: ClampToEdgeWrapping,
        MirroredRepeatWrapping: MirroredRepeatWrapping
};

const TEXTURE_FILTER = {
        NearestFilter: NearestFilter,
        NearestMipmapNearestFilter: NearestMipmapNearestFilter,
        NearestMipmapLinearFilter: NearestMipmapLinearFilter,
        LinearFilter: LinearFilter,
        LinearMipmapNearestFilter: LinearMipmapNearestFilter,
        LinearMipmapLinearFilter: LinearMipmapLinearFilter
};

function ImageBitmapLoader( manager ) {

        if ( typeof createImageBitmap === 'undefined' ) {

                console.warn( 'THREE.ImageBitmapLoader: createImageBitmap() not supported.' );

        }

        if ( typeof fetch === 'undefined' ) {

                console.warn( 'THREE.ImageBitmapLoader: fetch() not supported.' );

        }

        Loader.call( this, manager );

        this.options = { premultiplyAlpha: 'none' };

}

ImageBitmapLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: ImageBitmapLoader,

        isImageBitmapLoader: true,

        setOptions: function setOptions( options ) {

                this.options = options;

                return this;

        },

        load: function ( url, onLoad, onProgress, onError ) {

                if ( url === undefined ) url = '';

                if ( this.path !== undefined ) url = this.path + url;

                url = this.manager.resolveURL( url );

                const scope = this;

                const cached = Cache.get( url );

                if ( cached !== undefined ) {

                        scope.manager.itemStart( url );

                        setTimeout( function () {

                                if ( onLoad ) onLoad( cached );

                                scope.manager.itemEnd( url );

                        }, 0 );

                        return cached;

                }

                const fetchOptions = {};
                fetchOptions.credentials = ( this.crossOrigin === 'anonymous' ) ? 'same-origin' : 'include';

                fetch( url, fetchOptions ).then( function ( res ) {

                        return res.blob();

                } ).then( function ( blob ) {

                        return createImageBitmap( blob, scope.options );

                } ).then( function ( imageBitmap ) {

                        Cache.add( url, imageBitmap );

                        if ( onLoad ) onLoad( imageBitmap );

                        scope.manager.itemEnd( url );

                } ).catch( function ( e ) {

                        if ( onError ) onError( e );

                        scope.manager.itemError( url );
                        scope.manager.itemEnd( url );

                } );

                scope.manager.itemStart( url );

        }

} );

function ShapePath() {

        this.type = 'ShapePath';

        this.color = new Color();

        this.subPaths = [];
        this.currentPath = null;

}

Object.assign( ShapePath.prototype, {

        moveTo: function ( x, y ) {

                this.currentPath = new Path();
                this.subPaths.push( this.currentPath );
                this.currentPath.moveTo( x, y );

                return this;

        },

        lineTo: function ( x, y ) {

                this.currentPath.lineTo( x, y );

                return this;

        },

        quadraticCurveTo: function ( aCPx, aCPy, aX, aY ) {

                this.currentPath.quadraticCurveTo( aCPx, aCPy, aX, aY );

                return this;

        },

        bezierCurveTo: function ( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY ) {

                this.currentPath.bezierCurveTo( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY );

                return this;

        },

        splineThru: function ( pts ) {

                this.currentPath.splineThru( pts );

                return this;

        },

        toShapes: function ( isCCW, noHoles ) {

                function toShapesNoHoles( inSubpaths ) {

                        const shapes = [];

                        for ( let i = 0, l = inSubpaths.length; i < l; i ++ ) {

                                const tmpPath = inSubpaths[ i ];

                                const tmpShape = new Shape();
                                tmpShape.curves = tmpPath.curves;

                                shapes.push( tmpShape );

                        }

                        return shapes;

                }

                function isPointInsidePolygon( inPt, inPolygon ) {

                        const polyLen = inPolygon.length;

                        // inPt on polygon contour => immediate success    or
                        // toggling of inside/outside at every single! intersection point of an edge
                        //  with the horizontal line through inPt, left of inPt
                        //  not counting lowerY endpoints of edges and whole edges on that line
                        let inside = false;
                        for ( let p = polyLen - 1, q = 0; q < polyLen; p = q ++ ) {

                                let edgeLowPt = inPolygon[ p ];
                                let edgeHighPt = inPolygon[ q ];

                                let edgeDx = edgeHighPt.x - edgeLowPt.x;
                                let edgeDy = edgeHighPt.y - edgeLowPt.y;

                                if ( Math.abs( edgeDy ) > Number.EPSILON ) {

                                        // not parallel
                                        if ( edgeDy < 0 ) {

                                                edgeLowPt = inPolygon[ q ]; edgeDx = - edgeDx;
                                                edgeHighPt = inPolygon[ p ]; edgeDy = - edgeDy;

                                        }

                                        if ( ( inPt.y < edgeLowPt.y ) || ( inPt.y > edgeHighPt.y ) )            continue;

                                        if ( inPt.y === edgeLowPt.y ) {

                                                if ( inPt.x === edgeLowPt.x )           return  true;           // inPt is on contour ?
                                                // continue;                            // no intersection or edgeLowPt => doesn't count !!!

                                        } else {

                                                const perpEdge = edgeDy * ( inPt.x - edgeLowPt.x ) - edgeDx * ( inPt.y - edgeLowPt.y );
                                                if ( perpEdge === 0 )                           return  true;           // inPt is on contour ?
                                                if ( perpEdge < 0 )                             continue;
                                                inside = ! inside;              // true intersection left of inPt

                                        }

                                } else {

                                        // parallel or collinear
                                        if ( inPt.y !== edgeLowPt.y )           continue;                       // parallel
                                        // edge lies on the same horizontal line as inPt
                                        if ( ( ( edgeHighPt.x <= inPt.x ) && ( inPt.x <= edgeLowPt.x ) ) ||
                                                 ( ( edgeLowPt.x <= inPt.x ) && ( inPt.x <= edgeHighPt.x ) ) )          return  true;   // inPt: Point on contour !
                                        // continue;

                                }

                        }

                        return  inside;

                }

                const isClockWise = ShapeUtils.isClockWise;

                const subPaths = this.subPaths;
                if ( subPaths.length === 0 ) return [];

                if ( noHoles === true ) return  toShapesNoHoles( subPaths );


                let solid, tmpPath, tmpShape;
                const shapes = [];

                if ( subPaths.length === 1 ) {

                        tmpPath = subPaths[ 0 ];
                        tmpShape = new Shape();
                        tmpShape.curves = tmpPath.curves;
                        shapes.push( tmpShape );
                        return shapes;

                }

                let holesFirst = ! isClockWise( subPaths[ 0 ].getPoints() );
                holesFirst = isCCW ? ! holesFirst : holesFirst;

                // console.log("Holes first", holesFirst);

                const betterShapeHoles = [];
                const newShapes = [];
                let newShapeHoles = [];
                let mainIdx = 0;
                let tmpPoints;

                newShapes[ mainIdx ] = undefined;
                newShapeHoles[ mainIdx ] = [];

                for ( let i = 0, l = subPaths.length; i < l; i ++ ) {

                        tmpPath = subPaths[ i ];
                        tmpPoints = tmpPath.getPoints();
                        solid = isClockWise( tmpPoints );
                        solid = isCCW ? ! solid : solid;

                        if ( solid ) {

                                if ( ( ! holesFirst ) && ( newShapes[ mainIdx ] ) )     mainIdx ++;

                                newShapes[ mainIdx ] = { s: new Shape(), p: tmpPoints };
                                newShapes[ mainIdx ].s.curves = tmpPath.curves;

                                if ( holesFirst )       mainIdx ++;
                                newShapeHoles[ mainIdx ] = [];

                                //console.log('cw', i);

                        } else {

                                newShapeHoles[ mainIdx ].push( { h: tmpPath, p: tmpPoints[ 0 ] } );

                                //console.log('ccw', i);

                        }

                }

                // only Holes? -> probably all Shapes with wrong orientation
                if ( ! newShapes[ 0 ] ) return  toShapesNoHoles( subPaths );


                if ( newShapes.length > 1 ) {

                        let ambiguous = false;
                        const toChange = [];

                        for ( let sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx ++ ) {

                                betterShapeHoles[ sIdx ] = [];

                        }

                        for ( let sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx ++ ) {

                                const sho = newShapeHoles[ sIdx ];

                                for ( let hIdx = 0; hIdx < sho.length; hIdx ++ ) {

                                        const ho = sho[ hIdx ];
                                        let hole_unassigned = true;

                                        for ( let s2Idx = 0; s2Idx < newShapes.length; s2Idx ++ ) {

                                                if ( isPointInsidePolygon( ho.p, newShapes[ s2Idx ].p ) ) {

                                                        if ( sIdx !== s2Idx )   toChange.push( { froms: sIdx, tos: s2Idx, hole: hIdx } );
                                                        if ( hole_unassigned ) {

                                                                hole_unassigned = false;
                                                                betterShapeHoles[ s2Idx ].push( ho );

                                                        } else {

                                                                ambiguous = true;

                                                        }

                                                }

                                        }

                                        if ( hole_unassigned ) {

                                                betterShapeHoles[ sIdx ].push( ho );

                                        }

                                }

                        }
                        // console.log("ambiguous: ", ambiguous);

                        if ( toChange.length > 0 ) {

                                // console.log("to change: ", toChange);
                                if ( ! ambiguous )      newShapeHoles = betterShapeHoles;

                        }

                }

                let tmpHoles;

                for ( let i = 0, il = newShapes.length; i < il; i ++ ) {

                        tmpShape = newShapes[ i ].s;
                        shapes.push( tmpShape );
                        tmpHoles = newShapeHoles[ i ];

                        for ( let j = 0, jl = tmpHoles.length; j < jl; j ++ ) {

                                tmpShape.holes.push( tmpHoles[ j ].h );

                        }

                }

                //console.log("shape", shapes);

                return shapes;

        }

} );

function Font( data ) {

        this.type = 'Font';

        this.data = data;

}

Object.assign( Font.prototype, {

        isFont: true,

        generateShapes: function ( text, size = 100 ) {

                const shapes = [];
                const paths = createPaths( text, size, this.data );

                for ( let p = 0, pl = paths.length; p < pl; p ++ ) {

                        Array.prototype.push.apply( shapes, paths[ p ].toShapes() );

                }

                return shapes;

        }

} );

function createPaths( text, size, data ) {

        const chars = Array.from ? Array.from( text ) : String( text ).split( '' ); // workaround for IE11, see #13988
        const scale = size / data.resolution;
        const line_height = ( data.boundingBox.yMax - data.boundingBox.yMin + data.underlineThickness ) * scale;

        const paths = [];

        let offsetX = 0, offsetY = 0;

        for ( let i = 0; i < chars.length; i ++ ) {

                const char = chars[ i ];

                if ( char === '\n' ) {

                        offsetX = 0;
                        offsetY -= line_height;

                } else {

                        const ret = createPath( char, scale, offsetX, offsetY, data );
                        offsetX += ret.offsetX;
                        paths.push( ret.path );

                }

        }

        return paths;

}

function createPath( char, scale, offsetX, offsetY, data ) {

        const glyph = data.glyphs[ char ] || data.glyphs[ '?' ];

        if ( ! glyph ) {

                console.error( 'THREE.Font: character "' + char + '" does not exists in font family ' + data.familyName + '.' );

                return;

        }

        const path = new ShapePath();

        let x, y, cpx, cpy, cpx1, cpy1, cpx2, cpy2;

        if ( glyph.o ) {

                const outline = glyph._cachedOutline || ( glyph._cachedOutline = glyph.o.split( ' ' ) );

                for ( let i = 0, l = outline.length; i < l; ) {

                        const action = outline[ i ++ ];

                        switch ( action ) {

                                case 'm': // moveTo

                                        x = outline[ i ++ ] * scale + offsetX;
                                        y = outline[ i ++ ] * scale + offsetY;

                                        path.moveTo( x, y );

                                        break;

                                case 'l': // lineTo

                                        x = outline[ i ++ ] * scale + offsetX;
                                        y = outline[ i ++ ] * scale + offsetY;

                                        path.lineTo( x, y );

                                        break;

                                case 'q': // quadraticCurveTo

                                        cpx = outline[ i ++ ] * scale + offsetX;
                                        cpy = outline[ i ++ ] * scale + offsetY;
                                        cpx1 = outline[ i ++ ] * scale + offsetX;
                                        cpy1 = outline[ i ++ ] * scale + offsetY;

                                        path.quadraticCurveTo( cpx1, cpy1, cpx, cpy );

                                        break;

                                case 'b': // bezierCurveTo

                                        cpx = outline[ i ++ ] * scale + offsetX;
                                        cpy = outline[ i ++ ] * scale + offsetY;
                                        cpx1 = outline[ i ++ ] * scale + offsetX;
                                        cpy1 = outline[ i ++ ] * scale + offsetY;
                                        cpx2 = outline[ i ++ ] * scale + offsetX;
                                        cpy2 = outline[ i ++ ] * scale + offsetY;

                                        path.bezierCurveTo( cpx1, cpy1, cpx2, cpy2, cpx, cpy );

                                        break;

                        }

                }

        }

        return { offsetX: glyph.ha * scale, path: path };

}

function FontLoader( manager ) {

        Loader.call( this, manager );

}

FontLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: FontLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                const scope = this;

                const loader = new FileLoader( this.manager );
                loader.setPath( this.path );
                loader.setRequestHeader( this.requestHeader );
                loader.setWithCredentials( scope.withCredentials );
                loader.load( url, function ( text ) {

                        let json;

                        try {

                                json = JSON.parse( text );

                        } catch ( e ) {

                                console.warn( 'THREE.FontLoader: typeface.js support is being deprecated. Use typeface.json instead.' );
                                json = JSON.parse( text.substring( 65, text.length - 2 ) );

                        }

                        const font = scope.parse( json );

                        if ( onLoad ) onLoad( font );

                }, onProgress, onError );

        },

        parse: function ( json ) {

                return new Font( json );

        }

} );

let _context;

const AudioContext = {

        getContext: function () {

                if ( _context === undefined ) {

                        _context = new ( window.AudioContext || window.webkitAudioContext )();

                }

                return _context;

        },

        setContext: function ( value ) {

                _context = value;

        }

};

function AudioLoader( manager ) {

        Loader.call( this, manager );

}

AudioLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

        constructor: AudioLoader,

        load: function ( url, onLoad, onProgress, onError ) {

                const scope = this;

                const loader = new FileLoader( scope.manager );
                loader.setResponseType( 'arraybuffer' );
                loader.setPath( scope.path );
                loader.setRequestHeader( scope.requestHeader );
                loader.setWithCredentials( scope.withCredentials );
                loader.load( url, function ( buffer ) {

                        try {

                                // Create a copy of the buffer. The `decodeAudioData` method
                                // detaches the buffer when complete, preventing reuse.
                                const bufferCopy = buffer.slice( 0 );

                                const context = AudioContext.getContext();
                                context.decodeAudioData( bufferCopy, function ( audioBuffer ) {

                                        onLoad( audioBuffer );

                                } );

                        } catch ( e ) {

                                if ( onError ) {

                                        onError( e );

                                } else {

                                        console.error( e );

                                }

                                scope.manager.itemError( url );

                        }

                }, onProgress, onError );

        }

} );

function HemisphereLightProbe( skyColor, groundColor, intensity ) {

        LightProbe.call( this, undefined, intensity );

        const color1 = new Color().set( skyColor );
        const color2 = new Color().set( groundColor );

        const sky = new Vector3( color1.r, color1.g, color1.b );
        const ground = new Vector3( color2.r, color2.g, color2.b );

        // without extra factor of PI in the shader, should = 1 / Math.sqrt( Math.PI );
        const c0 = Math.sqrt( Math.PI );
        const c1 = c0 * Math.sqrt( 0.75 );

        this.sh.coefficients[ 0 ].copy( sky ).add( ground ).multiplyScalar( c0 );
        this.sh.coefficients[ 1 ].copy( sky ).sub( ground ).multiplyScalar( c1 );

}

HemisphereLightProbe.prototype = Object.assign( Object.create( LightProbe.prototype ), {

        constructor: HemisphereLightProbe,

        isHemisphereLightProbe: true,

        copy: function ( source ) { // modifying colors not currently supported

                LightProbe.prototype.copy.call( this, source );

                return this;

        },

        toJSON: function ( meta ) {

                const data = LightProbe.prototype.toJSON.call( this, meta );

                // data.sh = this.sh.toArray(); // todo

                return data;

        }

} );

function AmbientLightProbe( color, intensity ) {

        LightProbe.call( this, undefined, intensity );

        const color1 = new Color().set( color );

        // without extra factor of PI in the shader, would be 2 / Math.sqrt( Math.PI );
        this.sh.coefficients[ 0 ].set( color1.r, color1.g, color1.b ).multiplyScalar( 2 * Math.sqrt( Math.PI ) );

}

AmbientLightProbe.prototype = Object.assign( Object.create( LightProbe.prototype ), {

        constructor: AmbientLightProbe,

        isAmbientLightProbe: true,

        copy: function ( source ) { // modifying color not currently supported

                LightProbe.prototype.copy.call( this, source );

                return this;

        },

        toJSON: function ( meta ) {

                const data = LightProbe.prototype.toJSON.call( this, meta );

                // data.sh = this.sh.toArray(); // todo

                return data;

        }

} );

const _eyeRight = new Matrix4();
const _eyeLeft = new Matrix4();

function StereoCamera() {

        this.type = 'StereoCamera';

        this.aspect = 1;

        this.eyeSep = 0.064;

        this.cameraL = new PerspectiveCamera();
        this.cameraL.layers.enable( 1 );
        this.cameraL.matrixAutoUpdate = false;

        this.cameraR = new PerspectiveCamera();
        this.cameraR.layers.enable( 2 );
        this.cameraR.matrixAutoUpdate = false;

        this._cache = {
                focus: null,
                fov: null,
                aspect: null,
                near: null,
                far: null,
                zoom: null,
                eyeSep: null
        };

}

Object.assign( StereoCamera.prototype, {

        update: function ( camera ) {

                const cache = this._cache;

                const needsUpdate = cache.focus !== camera.focus || cache.fov !== camera.fov ||
                        cache.aspect !== camera.aspect * this.aspect || cache.near !== camera.near ||
                        cache.far !== camera.far || cache.zoom !== camera.zoom || cache.eyeSep !== this.eyeSep;

                if ( needsUpdate ) {

                        cache.focus = camera.focus;
                        cache.fov = camera.fov;
                        cache.aspect = camera.aspect * this.aspect;
                        cache.near = camera.near;
                        cache.far = camera.far;
                        cache.zoom = camera.zoom;
                        cache.eyeSep = this.eyeSep;

                        // Off-axis stereoscopic effect based on
                        // http://paulbourke.net/stereographics/stereorender/

                        const projectionMatrix = camera.projectionMatrix.clone();
                        const eyeSepHalf = cache.eyeSep / 2;
                        const eyeSepOnProjection = eyeSepHalf * cache.near / cache.focus;
                        const ymax = ( cache.near * Math.tan( MathUtils.DEG2RAD * cache.fov * 0.5 ) ) / cache.zoom;
                        let xmin, xmax;

                        // translate xOffset

                        _eyeLeft.elements[ 12 ] = - eyeSepHalf;
                        _eyeRight.elements[ 12 ] = eyeSepHalf;

                        // for left eye

                        xmin = - ymax * cache.aspect + eyeSepOnProjection;
                        xmax = ymax * cache.aspect + eyeSepOnProjection;

                        projectionMatrix.elements[ 0 ] = 2 * cache.near / ( xmax - xmin );
                        projectionMatrix.elements[ 8 ] = ( xmax + xmin ) / ( xmax - xmin );

                        this.cameraL.projectionMatrix.copy( projectionMatrix );

                        // for right eye

                        xmin = - ymax * cache.aspect - eyeSepOnProjection;
                        xmax = ymax * cache.aspect - eyeSepOnProjection;

                        projectionMatrix.elements[ 0 ] = 2 * cache.near / ( xmax - xmin );
                        projectionMatrix.elements[ 8 ] = ( xmax + xmin ) / ( xmax - xmin );

                        this.cameraR.projectionMatrix.copy( projectionMatrix );

                }

                this.cameraL.matrixWorld.copy( camera.matrixWorld ).multiply( _eyeLeft );
                this.cameraR.matrixWorld.copy( camera.matrixWorld ).multiply( _eyeRight );

        }

} );

class Clock {

        constructor( autoStart ) {

                this.autoStart = ( autoStart !== undefined ) ? autoStart : true;

                this.startTime = 0;
                this.oldTime = 0;
                this.elapsedTime = 0;

                this.running = false;

        }

        start() {

                this.startTime = now();

                this.oldTime = this.startTime;
                this.elapsedTime = 0;
                this.running = true;

        }

        stop() {

                this.getElapsedTime();
                this.running = false;
                this.autoStart = false;

        }

        getElapsedTime() {

                this.getDelta();
                return this.elapsedTime;

        }

        getDelta() {

                let diff = 0;

                if ( this.autoStart && ! this.running ) {

                        this.start();
                        return 0;

                }

                if ( this.running ) {

                        const newTime = now();

                        diff = ( newTime - this.oldTime ) / 1000;
                        this.oldTime = newTime;

                        this.elapsedTime += diff;

                }

                return diff;

        }

}

function now() {

        return ( typeof performance === 'undefined' ? Date : performance ).now(); // see #10732

}

const _position$2 = /*@__PURE__*/ new Vector3();
const _quaternion$3 = /*@__PURE__*/ new Quaternion();
const _scale$1 = /*@__PURE__*/ new Vector3();
const _orientation = /*@__PURE__*/ new Vector3();

class AudioListener extends Object3D {

        constructor() {

                super();

                this.type = 'AudioListener';

                this.context = AudioContext.getContext();

                this.gain = this.context.createGain();
                this.gain.connect( this.context.destination );

                this.filter = null;

                this.timeDelta = 0;

                // private

                this._clock = new Clock();

        }

        getInput() {

                return this.gain;

        }

        removeFilter() {

                if ( this.filter !== null ) {

                        this.gain.disconnect( this.filter );
                        this.filter.disconnect( this.context.destination );
                        this.gain.connect( this.context.destination );
                        this.filter = null;

                }

                return this;

        }

        getFilter() {

                return this.filter;

        }

        setFilter( value ) {

                if ( this.filter !== null ) {

                        this.gain.disconnect( this.filter );
                        this.filter.disconnect( this.context.destination );

                } else {

                        this.gain.disconnect( this.context.destination );

                }

                this.filter = value;
                this.gain.connect( this.filter );
                this.filter.connect( this.context.destination );

                return this;

        }

        getMasterVolume() {

                return this.gain.gain.value;

        }

        setMasterVolume( value ) {

                this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );

                return this;

        }

        updateMatrixWorld( force ) {

                super.updateMatrixWorld( force );

                const listener = this.context.listener;
                const up = this.up;

                this.timeDelta = this._clock.getDelta();

                this.matrixWorld.decompose( _position$2, _quaternion$3, _scale$1 );

                _orientation.set( 0, 0, - 1 ).applyQuaternion( _quaternion$3 );

                if ( listener.positionX ) {

                        // code path for Chrome (see #14393)

                        const endTime = this.context.currentTime + this.timeDelta;

                        listener.positionX.linearRampToValueAtTime( _position$2.x, endTime );
                        listener.positionY.linearRampToValueAtTime( _position$2.y, endTime );
                        listener.positionZ.linearRampToValueAtTime( _position$2.z, endTime );
                        listener.forwardX.linearRampToValueAtTime( _orientation.x, endTime );
                        listener.forwardY.linearRampToValueAtTime( _orientation.y, endTime );
                        listener.forwardZ.linearRampToValueAtTime( _orientation.z, endTime );
                        listener.upX.linearRampToValueAtTime( up.x, endTime );
                        listener.upY.linearRampToValueAtTime( up.y, endTime );
                        listener.upZ.linearRampToValueAtTime( up.z, endTime );

                } else {

                        listener.setPosition( _position$2.x, _position$2.y, _position$2.z );
                        listener.setOrientation( _orientation.x, _orientation.y, _orientation.z, up.x, up.y, up.z );

                }

        }

}

class Audio extends Object3D {

        constructor( listener ) {

                super();

                this.type = 'Audio';

                this.listener = listener;
                this.context = listener.context;

                this.gain = this.context.createGain();
                this.gain.connect( listener.getInput() );

                this.autoplay = false;

                this.buffer = null;
                this.detune = 0;
                this.loop = false;
                this.loopStart = 0;
                this.loopEnd = 0;
                this.offset = 0;
                this.duration = undefined;
                this.playbackRate = 1;
                this.isPlaying = false;
                this.hasPlaybackControl = true;
                this.source = null;
                this.sourceType = 'empty';

                this._startedAt = 0;
                this._progress = 0;
                this._connected = false;

                this.filters = [];

        }

        getOutput() {

                return this.gain;

        }

        setNodeSource( audioNode ) {

                this.hasPlaybackControl = false;
                this.sourceType = 'audioNode';
                this.source = audioNode;
                this.connect();

                return this;

        }

        setMediaElementSource( mediaElement ) {

                this.hasPlaybackControl = false;
                this.sourceType = 'mediaNode';
                this.source = this.context.createMediaElementSource( mediaElement );
                this.connect();

                return this;

        }

        setMediaStreamSource( mediaStream ) {

                this.hasPlaybackControl = false;
                this.sourceType = 'mediaStreamNode';
                this.source = this.context.createMediaStreamSource( mediaStream );
                this.connect();

                return this;

        }

        setBuffer( audioBuffer ) {

                this.buffer = audioBuffer;
                this.sourceType = 'buffer';

                if ( this.autoplay ) this.play();

                return this;

        }

        play( delay = 0 ) {

                if ( this.isPlaying === true ) {

                        console.warn( 'THREE.Audio: Audio is already playing.' );
                        return;

                }

                if ( this.hasPlaybackControl === false ) {

                        console.warn( 'THREE.Audio: this Audio has no playback control.' );
                        return;

                }

                this._startedAt = this.context.currentTime + delay;

                const source = this.context.createBufferSource();
                source.buffer = this.buffer;
                source.loop = this.loop;
                source.loopStart = this.loopStart;
                source.loopEnd = this.loopEnd;
                source.onended = this.onEnded.bind( this );
                source.start( this._startedAt, this._progress + this.offset, this.duration );

                this.isPlaying = true;

                this.source = source;

                this.setDetune( this.detune );
                this.setPlaybackRate( this.playbackRate );

                return this.connect();

        }

        pause() {

                if ( this.hasPlaybackControl === false ) {

                        console.warn( 'THREE.Audio: this Audio has no playback control.' );
                        return;

                }

                if ( this.isPlaying === true ) {

                        // update current progress

                        this._progress += Math.max( this.context.currentTime - this._startedAt, 0 ) * this.playbackRate;

                        if ( this.loop === true ) {

                                // ensure _progress does not exceed duration with looped audios

                                this._progress = this._progress % ( this.duration || this.buffer.duration );

                        }

                        this.source.stop();
                        this.source.onended = null;

                        this.isPlaying = false;

                }

                return this;

        }

        stop() {

                if ( this.hasPlaybackControl === false ) {

                        console.warn( 'THREE.Audio: this Audio has no playback control.' );
                        return;

                }

                this._progress = 0;

                this.source.stop();
                this.source.onended = null;
                this.isPlaying = false;

                return this;

        }

        connect() {

                if ( this.filters.length > 0 ) {

                        this.source.connect( this.filters[ 0 ] );

                        for ( let i = 1, l = this.filters.length; i < l; i ++ ) {

                                this.filters[ i - 1 ].connect( this.filters[ i ] );

                        }

                        this.filters[ this.filters.length - 1 ].connect( this.getOutput() );

                } else {

                        this.source.connect( this.getOutput() );

                }

                this._connected = true;

                return this;

        }

        disconnect() {

                if ( this.filters.length > 0 ) {

                        this.source.disconnect( this.filters[ 0 ] );

                        for ( let i = 1, l = this.filters.length; i < l; i ++ ) {

                                this.filters[ i - 1 ].disconnect( this.filters[ i ] );

                        }

                        this.filters[ this.filters.length - 1 ].disconnect( this.getOutput() );

                } else {

                        this.source.disconnect( this.getOutput() );

                }

                this._connected = false;

                return this;

        }

        getFilters() {

                return this.filters;

        }

        setFilters( value ) {

                if ( ! value ) value = [];

                if ( this._connected === true ) {

                        this.disconnect();
                        this.filters = value.slice();
                        this.connect();

                } else {

                        this.filters = value.slice();

                }

                return this;

        }

        setDetune( value ) {

                this.detune = value;

                if ( this.source.detune === undefined ) return; // only set detune when available

                if ( this.isPlaying === true ) {

                        this.source.detune.setTargetAtTime( this.detune, this.context.currentTime, 0.01 );

                }

                return this;

        }

        getDetune() {

                return this.detune;

        }

        getFilter() {

                return this.getFilters()[ 0 ];

        }

        setFilter( filter ) {

                return this.setFilters( filter ? [ filter ] : [] );

        }

        setPlaybackRate( value ) {

                if ( this.hasPlaybackControl === false ) {

                        console.warn( 'THREE.Audio: this Audio has no playback control.' );
                        return;

                }

                this.playbackRate = value;

                if ( this.isPlaying === true ) {

                        this.source.playbackRate.setTargetAtTime( this.playbackRate, this.context.currentTime, 0.01 );

                }

                return this;

        }

        getPlaybackRate() {

                return this.playbackRate;

        }

        onEnded() {

                this.isPlaying = false;

        }

        getLoop() {

                if ( this.hasPlaybackControl === false ) {

                        console.warn( 'THREE.Audio: this Audio has no playback control.' );
                        return false;

                }

                return this.loop;

        }

        setLoop( value ) {

                if ( this.hasPlaybackControl === false ) {

                        console.warn( 'THREE.Audio: this Audio has no playback control.' );
                        return;

                }

                this.loop = value;

                if ( this.isPlaying === true ) {

                        this.source.loop = this.loop;

                }

                return this;

        }

        setLoopStart( value ) {

                this.loopStart = value;

                return this;

        }

        setLoopEnd( value ) {

                this.loopEnd = value;

                return this;

        }

        getVolume() {

                return this.gain.gain.value;

        }

        setVolume( value ) {

                this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );

                return this;

        }

}

const _position$3 = /*@__PURE__*/ new Vector3();
const _quaternion$4 = /*@__PURE__*/ new Quaternion();
const _scale$2 = /*@__PURE__*/ new Vector3();
const _orientation$1 = /*@__PURE__*/ new Vector3();

class PositionalAudio extends Audio {

        constructor( listener ) {

                super( listener );

                this.panner = this.context.createPanner();
                this.panner.panningModel = 'HRTF';
                this.panner.connect( this.gain );

        }

        getOutput() {

                return this.panner;

        }

        getRefDistance() {

                return this.panner.refDistance;

        }

        setRefDistance( value ) {

                this.panner.refDistance = value;

                return this;

        }

        getRolloffFactor() {

                return this.panner.rolloffFactor;

        }

        setRolloffFactor( value ) {

                this.panner.rolloffFactor = value;

                return this;

        }

        getDistanceModel() {

                return this.panner.distanceModel;

        }

        setDistanceModel( value ) {

                this.panner.distanceModel = value;

                return this;

        }

        getMaxDistance() {

                return this.panner.maxDistance;

        }

        setMaxDistance( value ) {

                this.panner.maxDistance = value;

                return this;

        }

        setDirectionalCone( coneInnerAngle, coneOuterAngle, coneOuterGain ) {

                this.panner.coneInnerAngle = coneInnerAngle;
                this.panner.coneOuterAngle = coneOuterAngle;
                this.panner.coneOuterGain = coneOuterGain;

                return this;

        }

        updateMatrixWorld( force ) {

                super.updateMatrixWorld( force );

                if ( this.hasPlaybackControl === true && this.isPlaying === false ) return;

                this.matrixWorld.decompose( _position$3, _quaternion$4, _scale$2 );

                _orientation$1.set( 0, 0, 1 ).applyQuaternion( _quaternion$4 );

                const panner = this.panner;

                if ( panner.positionX ) {

                        // code path for Chrome and Firefox (see #14393)

                        const endTime = this.context.currentTime + this.listener.timeDelta;

                        panner.positionX.linearRampToValueAtTime( _position$3.x, endTime );
                        panner.positionY.linearRampToValueAtTime( _position$3.y, endTime );
                        panner.positionZ.linearRampToValueAtTime( _position$3.z, endTime );
                        panner.orientationX.linearRampToValueAtTime( _orientation$1.x, endTime );
                        panner.orientationY.linearRampToValueAtTime( _orientation$1.y, endTime );
                        panner.orientationZ.linearRampToValueAtTime( _orientation$1.z, endTime );

                } else {

                        panner.setPosition( _position$3.x, _position$3.y, _position$3.z );
                        panner.setOrientation( _orientation$1.x, _orientation$1.y, _orientation$1.z );

                }

        }

}

class AudioAnalyser {

        constructor( audio, fftSize = 2048 ) {

                this.analyser = audio.context.createAnalyser();
                this.analyser.fftSize = fftSize;

                this.data = new Uint8Array( this.analyser.frequencyBinCount );

                audio.getOutput().connect( this.analyser );

        }


        getFrequencyData() {

                this.analyser.getByteFrequencyData( this.data );

                return this.data;

        }

        getAverageFrequency() {

                let value = 0;
                const data = this.getFrequencyData();

                for ( let i = 0; i < data.length; i ++ ) {

                        value += data[ i ];

                }

                return value / data.length;

        }

}

function PropertyMixer( binding, typeName, valueSize ) {

        this.binding = binding;
        this.valueSize = valueSize;

        let mixFunction,
                mixFunctionAdditive,
                setIdentity;

        // buffer layout: [ incoming | accu0 | accu1 | orig | addAccu | (optional work) ]
        //
        // interpolators can use .buffer as their .result
        // the data then goes to 'incoming'
        //
        // 'accu0' and 'accu1' are used frame-interleaved for
        // the cumulative result and are compared to detect
        // changes
        //
        // 'orig' stores the original state of the property
        //
        // 'add' is used for additive cumulative results
        //
        // 'work' is optional and is only present for quaternion types. It is used
        // to store intermediate quaternion multiplication results

        switch ( typeName ) {

                case 'quaternion':
                        mixFunction = this._slerp;
                        mixFunctionAdditive = this._slerpAdditive;
                        setIdentity = this._setAdditiveIdentityQuaternion;

                        this.buffer = new Float64Array( valueSize * 6 );
                        this._workIndex = 5;
                        break;

                case 'string':
                case 'bool':
                        mixFunction = this._select;

                        // Use the regular mix function and for additive on these types,
                        // additive is not relevant for non-numeric types
                        mixFunctionAdditive = this._select;

                        setIdentity = this._setAdditiveIdentityOther;

                        this.buffer = new Array( valueSize * 5 );
                        break;

                default:
                        mixFunction = this._lerp;
                        mixFunctionAdditive = this._lerpAdditive;
                        setIdentity = this._setAdditiveIdentityNumeric;

                        this.buffer = new Float64Array( valueSize * 5 );

        }

        this._mixBufferRegion = mixFunction;
        this._mixBufferRegionAdditive = mixFunctionAdditive;
        this._setIdentity = setIdentity;
        this._origIndex = 3;
        this._addIndex = 4;

        this.cumulativeWeight = 0;
        this.cumulativeWeightAdditive = 0;

        this.useCount = 0;
        this.referenceCount = 0;

}

Object.assign( PropertyMixer.prototype, {

        // accumulate data in the 'incoming' region into 'accu<i>'
        accumulate: function ( accuIndex, weight ) {

                // note: happily accumulating nothing when weight = 0, the caller knows
                // the weight and shouldn't have made the call in the first place

                const buffer = this.buffer,
                        stride = this.valueSize,
                        offset = accuIndex * stride + stride;

                let currentWeight = this.cumulativeWeight;

                if ( currentWeight === 0 ) {

                        // accuN := incoming * weight

                        for ( let i = 0; i !== stride; ++ i ) {

                                buffer[ offset + i ] = buffer[ i ];

                        }

                        currentWeight = weight;

                } else {

                        // accuN := accuN + incoming * weight

                        currentWeight += weight;
                        const mix = weight / currentWeight;
                        this._mixBufferRegion( buffer, offset, 0, mix, stride );

                }

                this.cumulativeWeight = currentWeight;

        },

        // accumulate data in the 'incoming' region into 'add'
        accumulateAdditive: function ( weight ) {

                const buffer = this.buffer,
                        stride = this.valueSize,
                        offset = stride * this._addIndex;

                if ( this.cumulativeWeightAdditive === 0 ) {

                        // add = identity

                        this._setIdentity();

                }

                // add := add + incoming * weight

                this._mixBufferRegionAdditive( buffer, offset, 0, weight, stride );
                this.cumulativeWeightAdditive += weight;

        },

        // apply the state of 'accu<i>' to the binding when accus differ
        apply: function ( accuIndex ) {

                const stride = this.valueSize,
                        buffer = this.buffer,
                        offset = accuIndex * stride + stride,

                        weight = this.cumulativeWeight,
                        weightAdditive = this.cumulativeWeightAdditive,

                        binding = this.binding;

                this.cumulativeWeight = 0;
                this.cumulativeWeightAdditive = 0;

                if ( weight < 1 ) {

                        // accuN := accuN + original * ( 1 - cumulativeWeight )

                        const originalValueOffset = stride * this._origIndex;

                        this._mixBufferRegion(
                                buffer, offset, originalValueOffset, 1 - weight, stride );

                }

                if ( weightAdditive > 0 ) {

                        // accuN := accuN + additive accuN

                        this._mixBufferRegionAdditive( buffer, offset, this._addIndex * stride, 1, stride );

                }

                for ( let i = stride, e = stride + stride; i !== e; ++ i ) {

                        if ( buffer[ i ] !== buffer[ i + stride ] ) {

                                // value has changed -> update scene graph

                                binding.setValue( buffer, offset );
                                break;

                        }

                }

        },

        // remember the state of the bound property and copy it to both accus
        saveOriginalState: function () {

                const binding = this.binding;

                const buffer = this.buffer,
                        stride = this.valueSize,

                        originalValueOffset = stride * this._origIndex;

                binding.getValue( buffer, originalValueOffset );

                // accu[0..1] := orig -- initially detect changes against the original
                for ( let i = stride, e = originalValueOffset; i !== e; ++ i ) {

                        buffer[ i ] = buffer[ originalValueOffset + ( i % stride ) ];

                }

                // Add to identity for additive
                this._setIdentity();

                this.cumulativeWeight = 0;
                this.cumulativeWeightAdditive = 0;

        },

        // apply the state previously taken via 'saveOriginalState' to the binding
        restoreOriginalState: function () {

                const originalValueOffset = this.valueSize * 3;
                this.binding.setValue( this.buffer, originalValueOffset );

        },

        _setAdditiveIdentityNumeric: function () {

                const startIndex = this._addIndex * this.valueSize;
                const endIndex = startIndex + this.valueSize;

                for ( let i = startIndex; i < endIndex; i ++ ) {

                        this.buffer[ i ] = 0;

                }

        },

        _setAdditiveIdentityQuaternion: function () {

                this._setAdditiveIdentityNumeric();
                this.buffer[ this._addIndex * this.valueSize + 3 ] = 1;

        },

        _setAdditiveIdentityOther: function () {

                const startIndex = this._origIndex * this.valueSize;
                const targetIndex = this._addIndex * this.valueSize;

                for ( let i = 0; i < this.valueSize; i ++ ) {

                        this.buffer[ targetIndex + i ] = this.buffer[ startIndex + i ];

                }

        },


        // mix functions

        _select: function ( buffer, dstOffset, srcOffset, t, stride ) {

                if ( t >= 0.5 ) {

                        for ( let i = 0; i !== stride; ++ i ) {

                                buffer[ dstOffset + i ] = buffer[ srcOffset + i ];

                        }

                }

        },

        _slerp: function ( buffer, dstOffset, srcOffset, t ) {

                Quaternion.slerpFlat( buffer, dstOffset, buffer, dstOffset, buffer, srcOffset, t );

        },

        _slerpAdditive: function ( buffer, dstOffset, srcOffset, t, stride ) {

                const workOffset = this._workIndex * stride;

                // Store result in intermediate buffer offset
                Quaternion.multiplyQuaternionsFlat( buffer, workOffset, buffer, dstOffset, buffer, srcOffset );

                // Slerp to the intermediate result
                Quaternion.slerpFlat( buffer, dstOffset, buffer, dstOffset, buffer, workOffset, t );

        },

        _lerp: function ( buffer, dstOffset, srcOffset, t, stride ) {

                const s = 1 - t;

                for ( let i = 0; i !== stride; ++ i ) {

                        const j = dstOffset + i;

                        buffer[ j ] = buffer[ j ] * s + buffer[ srcOffset + i ] * t;

                }

        },

        _lerpAdditive: function ( buffer, dstOffset, srcOffset, t, stride ) {

                for ( let i = 0; i !== stride; ++ i ) {

                        const j = dstOffset + i;

                        buffer[ j ] = buffer[ j ] + buffer[ srcOffset + i ] * t;

                }

        }

} );

// Characters [].:/ are reserved for track binding syntax.
const _RESERVED_CHARS_RE = '\\[\\]\\.:\\/';
const _reservedRe = new RegExp( '[' + _RESERVED_CHARS_RE + ']', 'g' );

// Attempts to allow node names from any language. ES5's `\w` regexp matches
// only latin characters, and the unicode \p{L} is not yet supported. So
// instead, we exclude reserved characters and match everything else.
const _wordChar = '[^' + _RESERVED_CHARS_RE + ']';
const _wordCharOrDot = '[^' + _RESERVED_CHARS_RE.replace( '\\.', '' ) + ']';

// Parent directories, delimited by '/' or ':'. Currently unused, but must
// be matched to parse the rest of the track name.
const _directoryRe = /((?:WC+[\/:])*)/.source.replace( 'WC', _wordChar );

// Target node. May contain word characters (a-zA-Z0-9_) and '.' or '-'.
const _nodeRe = /(WCOD+)?/.source.replace( 'WCOD', _wordCharOrDot );

// Object on target node, and accessor. May not contain reserved
// characters. Accessor may contain any character except closing bracket.
const _objectRe = /(?:\.(WC+)(?:\[(.+)\])?)?/.source.replace( 'WC', _wordChar );

// Property and accessor. May not contain reserved characters. Accessor may
// contain any non-bracket characters.
const _propertyRe = /\.(WC+)(?:\[(.+)\])?/.source.replace( 'WC', _wordChar );

const _trackRe = new RegExp( ''
        + '^'
        + _directoryRe
        + _nodeRe
        + _objectRe
        + _propertyRe
        + '$'
);

const _supportedObjectNames = [ 'material', 'materials', 'bones' ];

function Composite( targetGroup, path, optionalParsedPath ) {

        const parsedPath = optionalParsedPath || PropertyBinding.parseTrackName( path );

        this._targetGroup = targetGroup;
        this._bindings = targetGroup.subscribe_( path, parsedPath );

}

Object.assign( Composite.prototype, {

        getValue: function ( array, offset ) {

                this.bind(); // bind all binding

                const firstValidIndex = this._targetGroup.nCachedObjects_,
                        binding = this._bindings[ firstValidIndex ];

                // and only call .getValue on the first
                if ( binding !== undefined ) binding.getValue( array, offset );

        },

        setValue: function ( array, offset ) {

                const bindings = this._bindings;

                for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

                        bindings[ i ].setValue( array, offset );

                }

        },

        bind: function () {

                const bindings = this._bindings;

                for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

                        bindings[ i ].bind();

                }

        },

        unbind: function () {

                const bindings = this._bindings;

                for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

                        bindings[ i ].unbind();

                }

        }

} );


function PropertyBinding( rootNode, path, parsedPath ) {

        this.path = path;
        this.parsedPath = parsedPath || PropertyBinding.parseTrackName( path );

        this.node = PropertyBinding.findNode( rootNode, this.parsedPath.nodeName ) || rootNode;

        this.rootNode = rootNode;

}

Object.assign( PropertyBinding, {

        Composite: Composite,

        create: function ( root, path, parsedPath ) {

                if ( ! ( root && root.isAnimationObjectGroup ) ) {

                        return new PropertyBinding( root, path, parsedPath );

                } else {

                        return new PropertyBinding.Composite( root, path, parsedPath );

                }

        },

        /**
         * Replaces spaces with underscores and removes unsupported characters from
         * node names, to ensure compatibility with parseTrackName().
         *
         * @param {string} name Node name to be sanitized.
         * @return {string}
         */
        sanitizeNodeName: function ( name ) {

                return name.replace( /\s/g, '_' ).replace( _reservedRe, '' );

        },

        parseTrackName: function ( trackName ) {

                const matches = _trackRe.exec( trackName );

                if ( ! matches ) {

                        throw new Error( 'PropertyBinding: Cannot parse trackName: ' + trackName );

                }

                const results = {
                        // directoryName: matches[ 1 ], // (tschw) currently unused
                        nodeName: matches[ 2 ],
                        objectName: matches[ 3 ],
                        objectIndex: matches[ 4 ],
                        propertyName: matches[ 5 ], // required
                        propertyIndex: matches[ 6 ]
                };

                const lastDot = results.nodeName && results.nodeName.lastIndexOf( '.' );

                if ( lastDot !== undefined && lastDot !== - 1 ) {

                        const objectName = results.nodeName.substring( lastDot + 1 );

                        // Object names must be checked against an allowlist. Otherwise, there
                        // is no way to parse 'foo.bar.baz': 'baz' must be a property, but
                        // 'bar' could be the objectName, or part of a nodeName (which can
                        // include '.' characters).
                        if ( _supportedObjectNames.indexOf( objectName ) !== - 1 ) {

                                results.nodeName = results.nodeName.substring( 0, lastDot );
                                results.objectName = objectName;

                        }

                }

                if ( results.propertyName === null || results.propertyName.length === 0 ) {

                        throw new Error( 'PropertyBinding: can not parse propertyName from trackName: ' + trackName );

                }

                return results;

        },

        findNode: function ( root, nodeName ) {

                if ( ! nodeName || nodeName === "" || nodeName === "." || nodeName === - 1 || nodeName === root.name || nodeName === root.uuid ) {

                        return root;

                }

                // search into skeleton bones.
                if ( root.skeleton ) {

                        const bone = root.skeleton.getBoneByName( nodeName );

                        if ( bone !== undefined ) {

                                return bone;

                        }

                }

                // search into node subtree.
                if ( root.children ) {

                        const searchNodeSubtree = function ( children ) {

                                for ( let i = 0; i < children.length; i ++ ) {

                                        const childNode = children[ i ];

                                        if ( childNode.name === nodeName || childNode.uuid === nodeName ) {

                                                return childNode;

                                        }

                                        const result = searchNodeSubtree( childNode.children );

                                        if ( result ) return result;

                                }

                                return null;

                        };

                        const subTreeNode = searchNodeSubtree( root.children );

                        if ( subTreeNode ) {

                                return subTreeNode;

                        }

                }

                return null;

        }

} );

Object.assign( PropertyBinding.prototype, { // prototype, continued

        // these are used to "bind" a nonexistent property
        _getValue_unavailable: function () {},
        _setValue_unavailable: function () {},

        BindingType: {
                Direct: 0,
                EntireArray: 1,
                ArrayElement: 2,
                HasFromToArray: 3
        },

        Versioning: {
                None: 0,
                NeedsUpdate: 1,
                MatrixWorldNeedsUpdate: 2
        },

        GetterByBindingType: [

                function getValue_direct( buffer, offset ) {

                        buffer[ offset ] = this.node[ this.propertyName ];

                },

                function getValue_array( buffer, offset ) {

                        const source = this.resolvedProperty;

                        for ( let i = 0, n = source.length; i !== n; ++ i ) {

                                buffer[ offset ++ ] = source[ i ];

                        }

                },

                function getValue_arrayElement( buffer, offset ) {

                        buffer[ offset ] = this.resolvedProperty[ this.propertyIndex ];

                },

                function getValue_toArray( buffer, offset ) {

                        this.resolvedProperty.toArray( buffer, offset );

                }

        ],

        SetterByBindingTypeAndVersioning: [

                [
                        // Direct

                        function setValue_direct( buffer, offset ) {

                                this.targetObject[ this.propertyName ] = buffer[ offset ];

                        },

                        function setValue_direct_setNeedsUpdate( buffer, offset ) {

                                this.targetObject[ this.propertyName ] = buffer[ offset ];
                                this.targetObject.needsUpdate = true;

                        },

                        function setValue_direct_setMatrixWorldNeedsUpdate( buffer, offset ) {

                                this.targetObject[ this.propertyName ] = buffer[ offset ];
                                this.targetObject.matrixWorldNeedsUpdate = true;

                        }

                ], [

                        // EntireArray

                        function setValue_array( buffer, offset ) {

                                const dest = this.resolvedProperty;

                                for ( let i = 0, n = dest.length; i !== n; ++ i ) {

                                        dest[ i ] = buffer[ offset ++ ];

                                }

                        },

                        function setValue_array_setNeedsUpdate( buffer, offset ) {

                                const dest = this.resolvedProperty;

                                for ( let i = 0, n = dest.length; i !== n; ++ i ) {

                                        dest[ i ] = buffer[ offset ++ ];

                                }

                                this.targetObject.needsUpdate = true;

                        },

                        function setValue_array_setMatrixWorldNeedsUpdate( buffer, offset ) {

                                const dest = this.resolvedProperty;

                                for ( let i = 0, n = dest.length; i !== n; ++ i ) {

                                        dest[ i ] = buffer[ offset ++ ];

                                }

                                this.targetObject.matrixWorldNeedsUpdate = true;

                        }

                ], [

                        // ArrayElement

                        function setValue_arrayElement( buffer, offset ) {

                                this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];

                        },

                        function setValue_arrayElement_setNeedsUpdate( buffer, offset ) {

                                this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];
                                this.targetObject.needsUpdate = true;

                        },

                        function setValue_arrayElement_setMatrixWorldNeedsUpdate( buffer, offset ) {

                                this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];
                                this.targetObject.matrixWorldNeedsUpdate = true;

                        }

                ], [

                        // HasToFromArray

                        function setValue_fromArray( buffer, offset ) {

                                this.resolvedProperty.fromArray( buffer, offset );

                        },

                        function setValue_fromArray_setNeedsUpdate( buffer, offset ) {

                                this.resolvedProperty.fromArray( buffer, offset );
                                this.targetObject.needsUpdate = true;

                        },

                        function setValue_fromArray_setMatrixWorldNeedsUpdate( buffer, offset ) {

                                this.resolvedProperty.fromArray( buffer, offset );
                                this.targetObject.matrixWorldNeedsUpdate = true;

                        }

                ]

        ],

        getValue: function getValue_unbound( targetArray, offset ) {

                this.bind();
                this.getValue( targetArray, offset );

                // Note: This class uses a State pattern on a per-method basis:
                // 'bind' sets 'this.getValue' / 'setValue' and shadows the
                // prototype version of these methods with one that represents
                // the bound state. When the property is not found, the methods
                // become no-ops.

        },

        setValue: function getValue_unbound( sourceArray, offset ) {

                this.bind();
                this.setValue( sourceArray, offset );

        },

        // create getter / setter pair for a property in the scene graph
        bind: function () {

                let targetObject = this.node;
                const parsedPath = this.parsedPath;

                const objectName = parsedPath.objectName;
                const propertyName = parsedPath.propertyName;
                let propertyIndex = parsedPath.propertyIndex;

                if ( ! targetObject ) {

                        targetObject = PropertyBinding.findNode( this.rootNode, parsedPath.nodeName ) || this.rootNode;

                        this.node = targetObject;

                }

                // set fail state so we can just 'return' on error
                this.getValue = this._getValue_unavailable;
                this.setValue = this._setValue_unavailable;

                // ensure there is a value node
                if ( ! targetObject ) {

                        console.error( 'THREE.PropertyBinding: Trying to update node for track: ' + this.path + ' but it wasn\'t found.' );
                        return;

                }

                if ( objectName ) {

                        let objectIndex = parsedPath.objectIndex;

                        // special cases were we need to reach deeper into the hierarchy to get the face materials....
                        switch ( objectName ) {

                                case 'materials':

                                        if ( ! targetObject.material ) {

                                                console.error( 'THREE.PropertyBinding: Can not bind to material as node does not have a material.', this );
                                                return;

                                        }

                                        if ( ! targetObject.material.materials ) {

                                                console.error( 'THREE.PropertyBinding: Can not bind to material.materials as node.material does not have a materials array.', this );
                                                return;

                                        }

                                        targetObject = targetObject.material.materials;

                                        break;

                                case 'bones':

                                        if ( ! targetObject.skeleton ) {

                                                console.error( 'THREE.PropertyBinding: Can not bind to bones as node does not have a skeleton.', this );
                                                return;

                                        }

                                        // potential future optimization: skip this if propertyIndex is already an integer
                                        // and convert the integer string to a true integer.

                                        targetObject = targetObject.skeleton.bones;

                                        // support resolving morphTarget names into indices.
                                        for ( let i = 0; i < targetObject.length; i ++ ) {

                                                if ( targetObject[ i ].name === objectIndex ) {

                                                        objectIndex = i;
                                                        break;

                                                }

                                        }

                                        break;

                                default:

                                        if ( targetObject[ objectName ] === undefined ) {

                                                console.error( 'THREE.PropertyBinding: Can not bind to objectName of node undefined.', this );
                                                return;

                                        }

                                        targetObject = targetObject[ objectName ];

                        }


                        if ( objectIndex !== undefined ) {

                                if ( targetObject[ objectIndex ] === undefined ) {

                                        console.error( 'THREE.PropertyBinding: Trying to bind to objectIndex of objectName, but is undefined.', this, targetObject );
                                        return;

                                }

                                targetObject = targetObject[ objectIndex ];

                        }

                }

                // resolve property
                const nodeProperty = targetObject[ propertyName ];

                if ( nodeProperty === undefined ) {

                        const nodeName = parsedPath.nodeName;

                        console.error( 'THREE.PropertyBinding: Trying to update property for track: ' + nodeName +
                                '.' + propertyName + ' but it wasn\'t found.', targetObject );
                        return;

                }

                // determine versioning scheme
                let versioning = this.Versioning.None;

                this.targetObject = targetObject;

                if ( targetObject.needsUpdate !== undefined ) { // material

                        versioning = this.Versioning.NeedsUpdate;

                } else if ( targetObject.matrixWorldNeedsUpdate !== undefined ) { // node transform

                        versioning = this.Versioning.MatrixWorldNeedsUpdate;

                }

                // determine how the property gets bound
                let bindingType = this.BindingType.Direct;

                if ( propertyIndex !== undefined ) {

                        // access a sub element of the property array (only primitives are supported right now)

                        if ( propertyName === "morphTargetInfluences" ) {

                                // potential optimization, skip this if propertyIndex is already an integer, and convert the integer string to a true integer.

                                // support resolving morphTarget names into indices.
                                if ( ! targetObject.geometry ) {

                                        console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.', this );
                                        return;

                                }

                                if ( targetObject.geometry.isBufferGeometry ) {

                                        if ( ! targetObject.geometry.morphAttributes ) {

                                                console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.morphAttributes.', this );
                                                return;

                                        }

                                        if ( targetObject.morphTargetDictionary[ propertyIndex ] !== undefined ) {

                                                propertyIndex = targetObject.morphTargetDictionary[ propertyIndex ];

                                        }


                                } else {

                                        console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences on THREE.Geometry. Use THREE.BufferGeometry instead.', this );
                                        return;

                                }

                        }

                        bindingType = this.BindingType.ArrayElement;

                        this.resolvedProperty = nodeProperty;
                        this.propertyIndex = propertyIndex;

                } else if ( nodeProperty.fromArray !== undefined && nodeProperty.toArray !== undefined ) {

                        // must use copy for Object3D.Euler/Quaternion

                        bindingType = this.BindingType.HasFromToArray;

                        this.resolvedProperty = nodeProperty;

                } else if ( Array.isArray( nodeProperty ) ) {

                        bindingType = this.BindingType.EntireArray;

                        this.resolvedProperty = nodeProperty;

                } else {

                        this.propertyName = propertyName;

                }

                // select getter / setter
                this.getValue = this.GetterByBindingType[ bindingType ];
                this.setValue = this.SetterByBindingTypeAndVersioning[ bindingType ][ versioning ];

        },

        unbind: function () {

                this.node = null;

                // back to the prototype version of getValue / setValue
                // note: avoiding to mutate the shape of 'this' via 'delete'
                this.getValue = this._getValue_unbound;
                this.setValue = this._setValue_unbound;

        }

} );

// DECLARE ALIAS AFTER assign prototype
Object.assign( PropertyBinding.prototype, {

        // initial state of these methods that calls 'bind'
        _getValue_unbound: PropertyBinding.prototype.getValue,
        _setValue_unbound: PropertyBinding.prototype.setValue,

} );

/**
 *
 * A group of objects that receives a shared animation state.
 *
 * Usage:
 *
 *  - Add objects you would otherwise pass as 'root' to the
 *    constructor or the .clipAction method of AnimationMixer.
 *
 *  - Instead pass this object as 'root'.
 *
 *  - You can also add and remove objects later when the mixer
 *    is running.
 *
 * Note:
 *
 *    Objects of this class appear as one object to the mixer,
 *    so cache control of the individual objects must be done
 *    on the group.
 *
 * Limitation:
 *
 *  - The animated properties must be compatible among the
 *    all objects in the group.
 *
 *  - A single property can either be controlled through a
 *    target group or directly, but not both.
 */

function AnimationObjectGroup() {

        this.uuid = MathUtils.generateUUID();

        // cached objects followed by the active ones
        this._objects = Array.prototype.slice.call( arguments );

        this.nCachedObjects_ = 0; // threshold
        // note: read by PropertyBinding.Composite

        const indices = {};
        this._indicesByUUID = indices; // for bookkeeping

        for ( let i = 0, n = arguments.length; i !== n; ++ i ) {

                indices[ arguments[ i ].uuid ] = i;

        }

        this._paths = []; // inside: string
        this._parsedPaths = []; // inside: { we don't care, here }
        this._bindings = []; // inside: Array< PropertyBinding >
        this._bindingsIndicesByPath = {}; // inside: indices in these arrays

        const scope = this;

        this.stats = {

                objects: {
                        get total() {

                                return scope._objects.length;

                        },
                        get inUse() {

                                return this.total - scope.nCachedObjects_;

                        }
                },
                get bindingsPerObject() {

                        return scope._bindings.length;

                }

        };

}

Object.assign( AnimationObjectGroup.prototype, {

        isAnimationObjectGroup: true,

        add: function () {

                const objects = this._objects,
                        indicesByUUID = this._indicesByUUID,
                        paths = this._paths,
                        parsedPaths = this._parsedPaths,
                        bindings = this._bindings,
                        nBindings = bindings.length;

                let knownObject = undefined,
                        nObjects = objects.length,
                        nCachedObjects = this.nCachedObjects_;

                for ( let i = 0, n = arguments.length; i !== n; ++ i ) {

                        const object = arguments[ i ],
                                uuid = object.uuid;
                        let index = indicesByUUID[ uuid ];

                        if ( index === undefined ) {

                                // unknown object -> add it to the ACTIVE region

                                index = nObjects ++;
                                indicesByUUID[ uuid ] = index;
                                objects.push( object );

                                // accounting is done, now do the same for all bindings

                                for ( let j = 0, m = nBindings; j !== m; ++ j ) {

                                        bindings[ j ].push( new PropertyBinding( object, paths[ j ], parsedPaths[ j ] ) );

                                }

                        } else if ( index < nCachedObjects ) {

                                knownObject = objects[ index ];

                                // move existing object to the ACTIVE region

                                const firstActiveIndex = -- nCachedObjects,
                                        lastCachedObject = objects[ firstActiveIndex ];

                                indicesByUUID[ lastCachedObject.uuid ] = index;
                                objects[ index ] = lastCachedObject;

                                indicesByUUID[ uuid ] = firstActiveIndex;
                                objects[ firstActiveIndex ] = object;

                                // accounting is done, now do the same for all bindings

                                for ( let j = 0, m = nBindings; j !== m; ++ j ) {

                                        const bindingsForPath = bindings[ j ],
                                                lastCached = bindingsForPath[ firstActiveIndex ];

                                        let binding = bindingsForPath[ index ];

                                        bindingsForPath[ index ] = lastCached;

                                        if ( binding === undefined ) {

                                                // since we do not bother to create new bindings
                                                // for objects that are cached, the binding may
                                                // or may not exist

                                                binding = new PropertyBinding( object, paths[ j ], parsedPaths[ j ] );

                                        }

                                        bindingsForPath[ firstActiveIndex ] = binding;

                                }

                        } else if ( objects[ index ] !== knownObject ) {

                                console.error( 'THREE.AnimationObjectGroup: Different objects with the same UUID ' +
                                        'detected. Clean the caches or recreate your infrastructure when reloading scenes.' );

                        } // else the object is already where we want it to be

                } // for arguments

                this.nCachedObjects_ = nCachedObjects;

        },

        remove: function () {

                const objects = this._objects,
                        indicesByUUID = this._indicesByUUID,
                        bindings = this._bindings,
                        nBindings = bindings.length;

                let nCachedObjects = this.nCachedObjects_;

                for ( let i = 0, n = arguments.length; i !== n; ++ i ) {

                        const object = arguments[ i ],
                                uuid = object.uuid,
                                index = indicesByUUID[ uuid ];

                        if ( index !== undefined && index >= nCachedObjects ) {

                                // move existing object into the CACHED region

                                const lastCachedIndex = nCachedObjects ++,
                                        firstActiveObject = objects[ lastCachedIndex ];

                                indicesByUUID[ firstActiveObject.uuid ] = index;
                                objects[ index ] = firstActiveObject;

                                indicesByUUID[ uuid ] = lastCachedIndex;
                                objects[ lastCachedIndex ] = object;

                                // accounting is done, now do the same for all bindings

                                for ( let j = 0, m = nBindings; j !== m; ++ j ) {

                                        const bindingsForPath = bindings[ j ],
                                                firstActive = bindingsForPath[ lastCachedIndex ],
                                                binding = bindingsForPath[ index ];

                                        bindingsForPath[ index ] = firstActive;
                                        bindingsForPath[ lastCachedIndex ] = binding;

                                }

                        }

                } // for arguments

                this.nCachedObjects_ = nCachedObjects;

        },

        // remove & forget
        uncache: function () {

                const objects = this._objects,
                        indicesByUUID = this._indicesByUUID,
                        bindings = this._bindings,
                        nBindings = bindings.length;

                let nCachedObjects = this.nCachedObjects_,
                        nObjects = objects.length;

                for ( let i = 0, n = arguments.length; i !== n; ++ i ) {

                        const object = arguments[ i ],
                                uuid = object.uuid,
                                index = indicesByUUID[ uuid ];

                        if ( index !== undefined ) {

                                delete indicesByUUID[ uuid ];

                                if ( index < nCachedObjects ) {

                                        // object is cached, shrink the CACHED region

                                        const firstActiveIndex = -- nCachedObjects,
                                                lastCachedObject = objects[ firstActiveIndex ],
                                                lastIndex = -- nObjects,
                                                lastObject = objects[ lastIndex ];

                                        // last cached object takes this object's place
                                        indicesByUUID[ lastCachedObject.uuid ] = index;
                                        objects[ index ] = lastCachedObject;

                                        // last object goes to the activated slot and pop
                                        indicesByUUID[ lastObject.uuid ] = firstActiveIndex;
                                        objects[ firstActiveIndex ] = lastObject;
                                        objects.pop();

                                        // accounting is done, now do the same for all bindings

                                        for ( let j = 0, m = nBindings; j !== m; ++ j ) {

                                                const bindingsForPath = bindings[ j ],
                                                        lastCached = bindingsForPath[ firstActiveIndex ],
                                                        last = bindingsForPath[ lastIndex ];

                                                bindingsForPath[ index ] = lastCached;
                                                bindingsForPath[ firstActiveIndex ] = last;
                                                bindingsForPath.pop();

                                        }

                                } else {

                                        // object is active, just swap with the last and pop

                                        const lastIndex = -- nObjects,
                                                lastObject = objects[ lastIndex ];

                                        if ( lastIndex > 0 ) {

                                                indicesByUUID[ lastObject.uuid ] = index;

                                        }

                                        objects[ index ] = lastObject;
                                        objects.pop();

                                        // accounting is done, now do the same for all bindings

                                        for ( let j = 0, m = nBindings; j !== m; ++ j ) {

                                                const bindingsForPath = bindings[ j ];

                                                bindingsForPath[ index ] = bindingsForPath[ lastIndex ];
                                                bindingsForPath.pop();

                                        }

                                } // cached or active

                        } // if object is known

                } // for arguments

                this.nCachedObjects_ = nCachedObjects;

        },

        // Internal interface used by befriended PropertyBinding.Composite:

        subscribe_: function ( path, parsedPath ) {

                // returns an array of bindings for the given path that is changed
                // according to the contained objects in the group

                const indicesByPath = this._bindingsIndicesByPath;
                let index = indicesByPath[ path ];
                const bindings = this._bindings;

                if ( index !== undefined ) return bindings[ index ];

                const paths = this._paths,
                        parsedPaths = this._parsedPaths,
                        objects = this._objects,
                        nObjects = objects.length,
                        nCachedObjects = this.nCachedObjects_,
                        bindingsForPath = new Array( nObjects );

                index = bindings.length;

                indicesByPath[ path ] = index;

                paths.push( path );
                parsedPaths.push( parsedPath );
                bindings.push( bindingsForPath );

                for ( let i = nCachedObjects, n = objects.length; i !== n; ++ i ) {

                        const object = objects[ i ];
                        bindingsForPath[ i ] = new PropertyBinding( object, path, parsedPath );

                }

                return bindingsForPath;

        },

        unsubscribe_: function ( path ) {

                // tells the group to forget about a property path and no longer
                // update the array previously obtained with 'subscribe_'

                const indicesByPath = this._bindingsIndicesByPath,
                        index = indicesByPath[ path ];

                if ( index !== undefined ) {

                        const paths = this._paths,
                                parsedPaths = this._parsedPaths,
                                bindings = this._bindings,
                                lastBindingsIndex = bindings.length - 1,
                                lastBindings = bindings[ lastBindingsIndex ],
                                lastBindingsPath = path[ lastBindingsIndex ];

                        indicesByPath[ lastBindingsPath ] = index;

                        bindings[ index ] = lastBindings;
                        bindings.pop();

                        parsedPaths[ index ] = parsedPaths[ lastBindingsIndex ];
                        parsedPaths.pop();

                        paths[ index ] = paths[ lastBindingsIndex ];
                        paths.pop();

                }

        }

} );

class AnimationAction {

        constructor( mixer, clip, localRoot = null, blendMode = clip.blendMode ) {

                this._mixer = mixer;
                this._clip = clip;
                this._localRoot = localRoot;
                this.blendMode = blendMode;

                const tracks = clip.tracks,
                        nTracks = tracks.length,
                        interpolants = new Array( nTracks );

                const interpolantSettings = {
                        endingStart: ZeroCurvatureEnding,
                        endingEnd: ZeroCurvatureEnding
                };

                for ( let i = 0; i !== nTracks; ++ i ) {

                        const interpolant = tracks[ i ].createInterpolant( null );
                        interpolants[ i ] = interpolant;
                        interpolant.settings = interpolantSettings;

                }

                this._interpolantSettings = interpolantSettings;

                this._interpolants = interpolants; // bound by the mixer

                // inside: PropertyMixer (managed by the mixer)
                this._propertyBindings = new Array( nTracks );

                this._cacheIndex = null; // for the memory manager
                this._byClipCacheIndex = null; // for the memory manager

                this._timeScaleInterpolant = null;
                this._weightInterpolant = null;

                this.loop = LoopRepeat;
                this._loopCount = - 1;

                // global mixer time when the action is to be started
                // it's set back to 'null' upon start of the action
                this._startTime = null;

                // scaled local time of the action
                // gets clamped or wrapped to 0..clip.duration according to loop
                this.time = 0;

                this.timeScale = 1;
                this._effectiveTimeScale = 1;

                this.weight = 1;
                this._effectiveWeight = 1;

                this.repetitions = Infinity; // no. of repetitions when looping

                this.paused = false; // true -> zero effective time scale
                this.enabled = true; // false -> zero effective weight

                this.clampWhenFinished = false;// keep feeding the last frame?

                this.zeroSlopeAtStart = true;// for smooth interpolation w/o separate
                this.zeroSlopeAtEnd = true;// clips for start, loop and end

        }

        // State & Scheduling

        play() {

                this._mixer._activateAction( this );

                return this;

        }

        stop() {

                this._mixer._deactivateAction( this );

                return this.reset();

        }

        reset() {

                this.paused = false;
                this.enabled = true;

                this.time = 0; // restart clip
                this._loopCount = - 1;// forget previous loops
                this._startTime = null;// forget scheduling

                return this.stopFading().stopWarping();

        }

        isRunning() {

                return this.enabled && ! this.paused && this.timeScale !== 0 &&
                        this._startTime === null && this._mixer._isActiveAction( this );

        }

        // return true when play has been called
        isScheduled() {

                return this._mixer._isActiveAction( this );

        }

        startAt( time ) {

                this._startTime = time;

                return this;

        }

        setLoop( mode, repetitions ) {

                this.loop = mode;
                this.repetitions = repetitions;

                return this;

        }

        // Weight

        // set the weight stopping any scheduled fading
        // although .enabled = false yields an effective weight of zero, this
        // method does *not* change .enabled, because it would be confusing
        setEffectiveWeight( weight ) {

                this.weight = weight;

                // note: same logic as when updated at runtime
                this._effectiveWeight = this.enabled ? weight : 0;

                return this.stopFading();

        }

        // return the weight considering fading and .enabled
        getEffectiveWeight() {

                return this._effectiveWeight;

        }

        fadeIn( duration ) {

                return this._scheduleFading( duration, 0, 1 );

        }

        fadeOut( duration ) {

                return this._scheduleFading( duration, 1, 0 );

        }

        crossFadeFrom( fadeOutAction, duration, warp ) {

                fadeOutAction.fadeOut( duration );
                this.fadeIn( duration );

                if ( warp ) {

                        const fadeInDuration = this._clip.duration,
                                fadeOutDuration = fadeOutAction._clip.duration,

                                startEndRatio = fadeOutDuration / fadeInDuration,
                                endStartRatio = fadeInDuration / fadeOutDuration;

                        fadeOutAction.warp( 1.0, startEndRatio, duration );
                        this.warp( endStartRatio, 1.0, duration );

                }

                return this;

        }

        crossFadeTo( fadeInAction, duration, warp ) {

                return fadeInAction.crossFadeFrom( this, duration, warp );

        }

        stopFading() {

                const weightInterpolant = this._weightInterpolant;

                if ( weightInterpolant !== null ) {

                        this._weightInterpolant = null;
                        this._mixer._takeBackControlInterpolant( weightInterpolant );

                }

                return this;

        }

        // Time Scale Control

        // set the time scale stopping any scheduled warping
        // although .paused = true yields an effective time scale of zero, this
        // method does *not* change .paused, because it would be confusing
        setEffectiveTimeScale( timeScale ) {

                this.timeScale = timeScale;
                this._effectiveTimeScale = this.paused ? 0 : timeScale;

                return this.stopWarping();

        }

        // return the time scale considering warping and .paused
        getEffectiveTimeScale() {

                return this._effectiveTimeScale;

        }

        setDuration( duration ) {

                this.timeScale = this._clip.duration / duration;

                return this.stopWarping();

        }

        syncWith( action ) {

                this.time = action.time;
                this.timeScale = action.timeScale;

                return this.stopWarping();

        }

        halt( duration ) {

                return this.warp( this._effectiveTimeScale, 0, duration );

        }

        warp( startTimeScale, endTimeScale, duration ) {

                const mixer = this._mixer,
                        now = mixer.time,
                        timeScale = this.timeScale;

                let interpolant = this._timeScaleInterpolant;

                if ( interpolant === null ) {

                        interpolant = mixer._lendControlInterpolant();
                        this._timeScaleInterpolant = interpolant;

                }

                const times = interpolant.parameterPositions,
                        values = interpolant.sampleValues;

                times[ 0 ] = now;
                times[ 1 ] = now + duration;

                values[ 0 ] = startTimeScale / timeScale;
                values[ 1 ] = endTimeScale / timeScale;

                return this;

        }

        stopWarping() {

                const timeScaleInterpolant = this._timeScaleInterpolant;

                if ( timeScaleInterpolant !== null ) {

                        this._timeScaleInterpolant = null;
                        this._mixer._takeBackControlInterpolant( timeScaleInterpolant );

                }

                return this;

        }

        // Object Accessors

        getMixer() {

                return this._mixer;

        }

        getClip() {

                return this._clip;

        }

        getRoot() {

                return this._localRoot || this._mixer._root;

        }

        // Interna

        _update( time, deltaTime, timeDirection, accuIndex ) {

                // called by the mixer

                if ( ! this.enabled ) {

                        // call ._updateWeight() to update ._effectiveWeight

                        this._updateWeight( time );
                        return;

                }

                const startTime = this._startTime;

                if ( startTime !== null ) {

                        // check for scheduled start of action

                        const timeRunning = ( time - startTime ) * timeDirection;
                        if ( timeRunning < 0 || timeDirection === 0 ) {

                                return; // yet to come / don't decide when delta = 0

                        }

                        // start

                        this._startTime = null; // unschedule
                        deltaTime = timeDirection * timeRunning;

                }

                // apply time scale and advance time

                deltaTime *= this._updateTimeScale( time );
                const clipTime = this._updateTime( deltaTime );

                // note: _updateTime may disable the action resulting in
                // an effective weight of 0

                const weight = this._updateWeight( time );

                if ( weight > 0 ) {

                        const interpolants = this._interpolants;
                        const propertyMixers = this._propertyBindings;

                        switch ( this.blendMode ) {

                                case AdditiveAnimationBlendMode:

                                        for ( let j = 0, m = interpolants.length; j !== m; ++ j ) {

                                                interpolants[ j ].evaluate( clipTime );
                                                propertyMixers[ j ].accumulateAdditive( weight );

                                        }

                                        break;

                                case NormalAnimationBlendMode:
                                default:

                                        for ( let j = 0, m = interpolants.length; j !== m; ++ j ) {

                                                interpolants[ j ].evaluate( clipTime );
                                                propertyMixers[ j ].accumulate( accuIndex, weight );

                                        }

                        }

                }

        }

        _updateWeight( time ) {

                let weight = 0;

                if ( this.enabled ) {

                        weight = this.weight;
                        const interpolant = this._weightInterpolant;

                        if ( interpolant !== null ) {

                                const interpolantValue = interpolant.evaluate( time )[ 0 ];

                                weight *= interpolantValue;

                                if ( time > interpolant.parameterPositions[ 1 ] ) {

                                        this.stopFading();

                                        if ( interpolantValue === 0 ) {

                                                // faded out, disable
                                                this.enabled = false;

                                        }

                                }

                        }

                }

                this._effectiveWeight = weight;
                return weight;

        }

        _updateTimeScale( time ) {

                let timeScale = 0;

                if ( ! this.paused ) {

                        timeScale = this.timeScale;

                        const interpolant = this._timeScaleInterpolant;

                        if ( interpolant !== null ) {

                                const interpolantValue = interpolant.evaluate( time )[ 0 ];

                                timeScale *= interpolantValue;

                                if ( time > interpolant.parameterPositions[ 1 ] ) {

                                        this.stopWarping();

                                        if ( timeScale === 0 ) {

                                                // motion has halted, pause
                                                this.paused = true;

                                        } else {

                                                // warp done - apply final time scale
                                                this.timeScale = timeScale;

                                        }

                                }

                        }

                }

                this._effectiveTimeScale = timeScale;
                return timeScale;

        }

        _updateTime( deltaTime ) {

                const duration = this._clip.duration;
                const loop = this.loop;

                let time = this.time + deltaTime;
                let loopCount = this._loopCount;

                const pingPong = ( loop === LoopPingPong );

                if ( deltaTime === 0 ) {

                        if ( loopCount === - 1 ) return time;

                        return ( pingPong && ( loopCount & 1 ) === 1 ) ? duration - time : time;

                }

                if ( loop === LoopOnce ) {

                        if ( loopCount === - 1 ) {

                                // just started

                                this._loopCount = 0;
                                this._setEndings( true, true, false );

                        }

                        handle_stop: {

                                if ( time >= duration ) {

                                        time = duration;

                                } else if ( time < 0 ) {

                                        time = 0;

                                } else {

                                        this.time = time;

                                        break handle_stop;

                                }

                                if ( this.clampWhenFinished ) this.paused = true;
                                else this.enabled = false;

                                this.time = time;

                                this._mixer.dispatchEvent( {
                                        type: 'finished', action: this,
                                        direction: deltaTime < 0 ? - 1 : 1
                                } );

                        }

                } else { // repetitive Repeat or PingPong

                        if ( loopCount === - 1 ) {

                                // just started

                                if ( deltaTime >= 0 ) {

                                        loopCount = 0;

                                        this._setEndings( true, this.repetitions === 0, pingPong );

                                } else {

                                        // when looping in reverse direction, the initial
                                        // transition through zero counts as a repetition,
                                        // so leave loopCount at -1

                                        this._setEndings( this.repetitions === 0, true, pingPong );

                                }

                        }

                        if ( time >= duration || time < 0 ) {

                                // wrap around

                                const loopDelta = Math.floor( time / duration ); // signed
                                time -= duration * loopDelta;

                                loopCount += Math.abs( loopDelta );

                                const pending = this.repetitions - loopCount;

                                if ( pending <= 0 ) {

                                        // have to stop (switch state, clamp time, fire event)

                                        if ( this.clampWhenFinished ) this.paused = true;
                                        else this.enabled = false;

                                        time = deltaTime > 0 ? duration : 0;

                                        this.time = time;

                                        this._mixer.dispatchEvent( {
                                                type: 'finished', action: this,
                                                direction: deltaTime > 0 ? 1 : - 1
                                        } );

                                } else {

                                        // keep running

                                        if ( pending === 1 ) {

                                                // entering the last round

                                                const atStart = deltaTime < 0;
                                                this._setEndings( atStart, ! atStart, pingPong );

                                        } else {

                                                this._setEndings( false, false, pingPong );

                                        }

                                        this._loopCount = loopCount;

                                        this.time = time;

                                        this._mixer.dispatchEvent( {
                                                type: 'loop', action: this, loopDelta: loopDelta
                                        } );

                                }

                        } else {

                                this.time = time;

                        }

                        if ( pingPong && ( loopCount & 1 ) === 1 ) {

                                // invert time for the "pong round"

                                return duration - time;

                        }

                }

                return time;

        }

        _setEndings( atStart, atEnd, pingPong ) {

                const settings = this._interpolantSettings;

                if ( pingPong ) {

                        settings.endingStart = ZeroSlopeEnding;
                        settings.endingEnd = ZeroSlopeEnding;

                } else {

                        // assuming for LoopOnce atStart == atEnd == true

                        if ( atStart ) {

                                settings.endingStart = this.zeroSlopeAtStart ? ZeroSlopeEnding : ZeroCurvatureEnding;

                        } else {

                                settings.endingStart = WrapAroundEnding;

                        }

                        if ( atEnd ) {

                                settings.endingEnd = this.zeroSlopeAtEnd ? ZeroSlopeEnding : ZeroCurvatureEnding;

                        } else {

                                settings.endingEnd       = WrapAroundEnding;

                        }

                }

        }

        _scheduleFading( duration, weightNow, weightThen ) {

                const mixer = this._mixer, now = mixer.time;
                let interpolant = this._weightInterpolant;

                if ( interpolant === null ) {

                        interpolant = mixer._lendControlInterpolant();
                        this._weightInterpolant = interpolant;

                }

                const times = interpolant.parameterPositions,
                        values = interpolant.sampleValues;

                times[ 0 ] = now;
                values[ 0 ] = weightNow;
                times[ 1 ] = now + duration;
                values[ 1 ] = weightThen;

                return this;

        }

}

function AnimationMixer( root ) {

        this._root = root;
        this._initMemoryManager();
        this._accuIndex = 0;

        this.time = 0;

        this.timeScale = 1.0;

}

AnimationMixer.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

        constructor: AnimationMixer,

        _bindAction: function ( action, prototypeAction ) {

                const root = action._localRoot || this._root,
                        tracks = action._clip.tracks,
                        nTracks = tracks.length,
                        bindings = action._propertyBindings,
                        interpolants = action._interpolants,
                        rootUuid = root.uuid,
                        bindingsByRoot = this._bindingsByRootAndName;

                let bindingsByName = bindingsByRoot[ rootUuid ];

                if ( bindingsByName === undefined ) {

                        bindingsByName = {};
                        bindingsByRoot[ rootUuid ] = bindingsByName;

                }

                for ( let i = 0; i !== nTracks; ++ i ) {

                        const track = tracks[ i ],
                                trackName = track.name;

                        let binding = bindingsByName[ trackName ];

                        if ( binding !== undefined ) {

                                bindings[ i ] = binding;

                        } else {

                                binding = bindings[ i ];

                                if ( binding !== undefined ) {

                                        // existing binding, make sure the cache knows

                                        if ( binding._cacheIndex === null ) {

                                                ++ binding.referenceCount;
                                                this._addInactiveBinding( binding, rootUuid, trackName );

                                        }

                                        continue;

                                }

                                const path = prototypeAction && prototypeAction.
                                        _propertyBindings[ i ].binding.parsedPath;

                                binding = new PropertyMixer(
                                        PropertyBinding.create( root, trackName, path ),
                                        track.ValueTypeName, track.getValueSize() );

                                ++ binding.referenceCount;
                                this._addInactiveBinding( binding, rootUuid, trackName );

                                bindings[ i ] = binding;

                        }

                        interpolants[ i ].resultBuffer = binding.buffer;

                }

        },

        _activateAction: function ( action ) {

                if ( ! this._isActiveAction( action ) ) {

                        if ( action._cacheIndex === null ) {

                                // this action has been forgotten by the cache, but the user
                                // appears to be still using it -> rebind

                                const rootUuid = ( action._localRoot || this._root ).uuid,
                                        clipUuid = action._clip.uuid,
                                        actionsForClip = this._actionsByClip[ clipUuid ];

                                this._bindAction( action,
                                        actionsForClip && actionsForClip.knownActions[ 0 ] );

                                this._addInactiveAction( action, clipUuid, rootUuid );

                        }

                        const bindings = action._propertyBindings;

                        // increment reference counts / sort out state
                        for ( let i = 0, n = bindings.length; i !== n; ++ i ) {

                                const binding = bindings[ i ];

                                if ( binding.useCount ++ === 0 ) {

                                        this._lendBinding( binding );
                                        binding.saveOriginalState();

                                }

                        }

                        this._lendAction( action );

                }

        },

        _deactivateAction: function ( action ) {

                if ( this._isActiveAction( action ) ) {

                        const bindings = action._propertyBindings;

                        // decrement reference counts / sort out state
                        for ( let i = 0, n = bindings.length; i !== n; ++ i ) {

                                const binding = bindings[ i ];

                                if ( -- binding.useCount === 0 ) {

                                        binding.restoreOriginalState();
                                        this._takeBackBinding( binding );

                                }

                        }

                        this._takeBackAction( action );

                }

        },

        // Memory manager

        _initMemoryManager: function () {

                this._actions = []; // 'nActiveActions' followed by inactive ones
                this._nActiveActions = 0;

                this._actionsByClip = {};
                // inside:
                // {
                //      knownActions: Array< AnimationAction > - used as prototypes
                //      actionByRoot: AnimationAction - lookup
                // }


                this._bindings = []; // 'nActiveBindings' followed by inactive ones
                this._nActiveBindings = 0;

                this._bindingsByRootAndName = {}; // inside: Map< name, PropertyMixer >


                this._controlInterpolants = []; // same game as above
                this._nActiveControlInterpolants = 0;

                const scope = this;

                this.stats = {

                        actions: {
                                get total() {

                                        return scope._actions.length;

                                },
                                get inUse() {

                                        return scope._nActiveActions;

                                }
                        },
                        bindings: {
                                get total() {

                                        return scope._bindings.length;

                                },
                                get inUse() {

                                        return scope._nActiveBindings;

                                }
                        },
                        controlInterpolants: {
                                get total() {

                                        return scope._controlInterpolants.length;

                                },
                                get inUse() {

                                        return scope._nActiveControlInterpolants;

                                }
                        }

                };

        },

        // Memory management for AnimationAction objects

        _isActiveAction: function ( action ) {

                const index = action._cacheIndex;
                return index !== null && index < this._nActiveActions;

        },

        _addInactiveAction: function ( action, clipUuid, rootUuid ) {

                const actions = this._actions,
                        actionsByClip = this._actionsByClip;

                let actionsForClip = actionsByClip[ clipUuid ];

                if ( actionsForClip === undefined ) {

                        actionsForClip = {

                                knownActions: [ action ],
                                actionByRoot: {}

                        };

                        action._byClipCacheIndex = 0;

                        actionsByClip[ clipUuid ] = actionsForClip;

                } else {

                        const knownActions = actionsForClip.knownActions;

                        action._byClipCacheIndex = knownActions.length;
                        knownActions.push( action );

                }

                action._cacheIndex = actions.length;
                actions.push( action );

                actionsForClip.actionByRoot[ rootUuid ] = action;

        },

        _removeInactiveAction: function ( action ) {

                const actions = this._actions,
                        lastInactiveAction = actions[ actions.length - 1 ],
                        cacheIndex = action._cacheIndex;

                lastInactiveAction._cacheIndex = cacheIndex;
                actions[ cacheIndex ] = lastInactiveAction;
                actions.pop();

                action._cacheIndex = null;


                const clipUuid = action._clip.uuid,
                        actionsByClip = this._actionsByClip,
                        actionsForClip = actionsByClip[ clipUuid ],
                        knownActionsForClip = actionsForClip.knownActions,

                        lastKnownAction =
                                knownActionsForClip[ knownActionsForClip.length - 1 ],

                        byClipCacheIndex = action._byClipCacheIndex;

                lastKnownAction._byClipCacheIndex = byClipCacheIndex;
                knownActionsForClip[ byClipCacheIndex ] = lastKnownAction;
                knownActionsForClip.pop();

                action._byClipCacheIndex = null;


                const actionByRoot = actionsForClip.actionByRoot,
                        rootUuid = ( action._localRoot || this._root ).uuid;

                delete actionByRoot[ rootUuid ];

                if ( knownActionsForClip.length === 0 ) {

                        delete actionsByClip[ clipUuid ];

                }

                this._removeInactiveBindingsForAction( action );

        },

        _removeInactiveBindingsForAction: function ( action ) {

                const bindings = action._propertyBindings;

                for ( let i = 0, n = bindings.length; i !== n; ++ i ) {

                        const binding = bindings[ i ];

                        if ( -- binding.referenceCount === 0 ) {

                                this._removeInactiveBinding( binding );

                        }

                }

        },

        _lendAction: function ( action ) {

                // [ active actions |  inactive actions  ]
                // [  active actions >| inactive actions ]
                //                 s        a
                //                  <-swap->
                //                 a        s

                const actions = this._actions,
                        prevIndex = action._cacheIndex,

                        lastActiveIndex = this._nActiveActions ++,

                        firstInactiveAction = actions[ lastActiveIndex ];

                action._cacheIndex = lastActiveIndex;
                actions[ lastActiveIndex ] = action;

                firstInactiveAction._cacheIndex = prevIndex;
                actions[ prevIndex ] = firstInactiveAction;

        },

        _takeBackAction: function ( action ) {

                // [  active actions  | inactive actions ]
                // [ active actions |< inactive actions  ]
                //        a        s
                //         <-swap->
                //        s        a

                const actions = this._actions,
                        prevIndex = action._cacheIndex,

                        firstInactiveIndex = -- this._nActiveActions,

                        lastActiveAction = actions[ firstInactiveIndex ];

                action._cacheIndex = firstInactiveIndex;
                actions[ firstInactiveIndex ] = action;

                lastActiveAction._cacheIndex = prevIndex;
                actions[ prevIndex ] = lastActiveAction;

        },

        // Memory management for PropertyMixer objects

        _addInactiveBinding: function ( binding, rootUuid, trackName ) {

                const bindingsByRoot = this._bindingsByRootAndName,
                        bindings = this._bindings;

                let bindingByName = bindingsByRoot[ rootUuid ];

                if ( bindingByName === undefined ) {

                        bindingByName = {};
                        bindingsByRoot[ rootUuid ] = bindingByName;

                }

                bindingByName[ trackName ] = binding;

                binding._cacheIndex = bindings.length;
                bindings.push( binding );

        },

        _removeInactiveBinding: function ( binding ) {

                const bindings = this._bindings,
                        propBinding = binding.binding,
                        rootUuid = propBinding.rootNode.uuid,
                        trackName = propBinding.path,
                        bindingsByRoot = this._bindingsByRootAndName,
                        bindingByName = bindingsByRoot[ rootUuid ],

                        lastInactiveBinding = bindings[ bindings.length - 1 ],
                        cacheIndex = binding._cacheIndex;

                lastInactiveBinding._cacheIndex = cacheIndex;
                bindings[ cacheIndex ] = lastInactiveBinding;
                bindings.pop();

                delete bindingByName[ trackName ];

                if ( Object.keys( bindingByName ).length === 0 ) {

                        delete bindingsByRoot[ rootUuid ];

                }

        },

        _lendBinding: function ( binding ) {

                const bindings = this._bindings,
                        prevIndex = binding._cacheIndex,

                        lastActiveIndex = this._nActiveBindings ++,

                        firstInactiveBinding = bindings[ lastActiveIndex ];

                binding._cacheIndex = lastActiveIndex;
                bindings[ lastActiveIndex ] = binding;

                firstInactiveBinding._cacheIndex = prevIndex;
                bindings[ prevIndex ] = firstInactiveBinding;

        },

        _takeBackBinding: function ( binding ) {

                const bindings = this._bindings,
                        prevIndex = binding._cacheIndex,

                        firstInactiveIndex = -- this._nActiveBindings,

                        lastActiveBinding = bindings[ firstInactiveIndex ];

                binding._cacheIndex = firstInactiveIndex;
                bindings[ firstInactiveIndex ] = binding;

                lastActiveBinding._cacheIndex = prevIndex;
                bindings[ prevIndex ] = lastActiveBinding;

        },


        // Memory management of Interpolants for weight and time scale

        _lendControlInterpolant: function () {

                const interpolants = this._controlInterpolants,
                        lastActiveIndex = this._nActiveControlInterpolants ++;

                let interpolant = interpolants[ lastActiveIndex ];

                if ( interpolant === undefined ) {

                        interpolant = new LinearInterpolant(
                                new Float32Array( 2 ), new Float32Array( 2 ),
                                1, this._controlInterpolantsResultBuffer );

                        interpolant.__cacheIndex = lastActiveIndex;
                        interpolants[ lastActiveIndex ] = interpolant;

                }

                return interpolant;

        },

        _takeBackControlInterpolant: function ( interpolant ) {

                const interpolants = this._controlInterpolants,
                        prevIndex = interpolant.__cacheIndex,

                        firstInactiveIndex = -- this._nActiveControlInterpolants,

                        lastActiveInterpolant = interpolants[ firstInactiveIndex ];

                interpolant.__cacheIndex = firstInactiveIndex;
                interpolants[ firstInactiveIndex ] = interpolant;

                lastActiveInterpolant.__cacheIndex = prevIndex;
                interpolants[ prevIndex ] = lastActiveInterpolant;

        },

        _controlInterpolantsResultBuffer: new Float32Array( 1 ),

        // return an action for a clip optionally using a custom root target
        // object (this method allocates a lot of dynamic memory in case a
        // previously unknown clip/root combination is specified)
        clipAction: function ( clip, optionalRoot, blendMode ) {

                const root = optionalRoot || this._root,
                        rootUuid = root.uuid;

                let clipObject = typeof clip === 'string' ? AnimationClip.findByName( root, clip ) : clip;

                const clipUuid = clipObject !== null ? clipObject.uuid : clip;

                const actionsForClip = this._actionsByClip[ clipUuid ];
                let prototypeAction = null;

                if ( blendMode === undefined ) {

                        if ( clipObject !== null ) {

                                blendMode = clipObject.blendMode;

                        } else {

                                blendMode = NormalAnimationBlendMode;

                        }

                }

                if ( actionsForClip !== undefined ) {

                        const existingAction = actionsForClip.actionByRoot[ rootUuid ];

                        if ( existingAction !== undefined && existingAction.blendMode === blendMode ) {

                                return existingAction;

                        }

                        // we know the clip, so we don't have to parse all
                        // the bindings again but can just copy
                        prototypeAction = actionsForClip.knownActions[ 0 ];

                        // also, take the clip from the prototype action
                        if ( clipObject === null )
                                clipObject = prototypeAction._clip;

                }

                // clip must be known when specified via string
                if ( clipObject === null ) return null;

                // allocate all resources required to run it
                const newAction = new AnimationAction( this, clipObject, optionalRoot, blendMode );

                this._bindAction( newAction, prototypeAction );

                // and make the action known to the memory manager
                this._addInactiveAction( newAction, clipUuid, rootUuid );

                return newAction;

        },

        // get an existing action
        existingAction: function ( clip, optionalRoot ) {

                const root = optionalRoot || this._root,
                        rootUuid = root.uuid,

                        clipObject = typeof clip === 'string' ?
                                AnimationClip.findByName( root, clip ) : clip,

                        clipUuid = clipObject ? clipObject.uuid : clip,

                        actionsForClip = this._actionsByClip[ clipUuid ];

                if ( actionsForClip !== undefined ) {

                        return actionsForClip.actionByRoot[ rootUuid ] || null;

                }

                return null;

        },

        // deactivates all previously scheduled actions
        stopAllAction: function () {

                const actions = this._actions,
                        nActions = this._nActiveActions;

                for ( let i = nActions - 1; i >= 0; -- i ) {

                        actions[ i ].stop();

                }

                return this;

        },

        // advance the time and update apply the animation
        update: function ( deltaTime ) {

                deltaTime *= this.timeScale;

                const actions = this._actions,
                        nActions = this._nActiveActions,

                        time = this.time += deltaTime,
                        timeDirection = Math.sign( deltaTime ),

                        accuIndex = this._accuIndex ^= 1;

                // run active actions

                for ( let i = 0; i !== nActions; ++ i ) {

                        const action = actions[ i ];

                        action._update( time, deltaTime, timeDirection, accuIndex );

                }

                // update scene graph

                const bindings = this._bindings,
                        nBindings = this._nActiveBindings;

                for ( let i = 0; i !== nBindings; ++ i ) {

                        bindings[ i ].apply( accuIndex );

                }

                return this;

        },

        // Allows you to seek to a specific time in an animation.
        setTime: function ( timeInSeconds ) {

                this.time = 0; // Zero out time attribute for AnimationMixer object;
                for ( let i = 0; i < this._actions.length; i ++ ) {

                        this._actions[ i ].time = 0; // Zero out time attribute for all associated AnimationAction objects.

                }

                return this.update( timeInSeconds ); // Update used to set exact time. Returns "this" AnimationMixer object.

        },

        // return this mixer's root target object
        getRoot: function () {

                return this._root;

        },

        // free all resources specific to a particular clip
        uncacheClip: function ( clip ) {

                const actions = this._actions,
                        clipUuid = clip.uuid,
                        actionsByClip = this._actionsByClip,
                        actionsForClip = actionsByClip[ clipUuid ];

                if ( actionsForClip !== undefined ) {

                        // note: just calling _removeInactiveAction would mess up the
                        // iteration state and also require updating the state we can
                        // just throw away

                        const actionsToRemove = actionsForClip.knownActions;

                        for ( let i = 0, n = actionsToRemove.length; i !== n; ++ i ) {

                                const action = actionsToRemove[ i ];

                                this._deactivateAction( action );

                                const cacheIndex = action._cacheIndex,
                                        lastInactiveAction = actions[ actions.length - 1 ];

                                action._cacheIndex = null;
                                action._byClipCacheIndex = null;

                                lastInactiveAction._cacheIndex = cacheIndex;
                                actions[ cacheIndex ] = lastInactiveAction;
                                actions.pop();

                                this._removeInactiveBindingsForAction( action );

                        }

                        delete actionsByClip[ clipUuid ];

                }

        },

        // free all resources specific to a particular root target object
        uncacheRoot: function ( root ) {

                const rootUuid = root.uuid,
                        actionsByClip = this._actionsByClip;

                for ( const clipUuid in actionsByClip ) {

                        const actionByRoot = actionsByClip[ clipUuid ].actionByRoot,
                                action = actionByRoot[ rootUuid ];

                        if ( action !== undefined ) {

                                this._deactivateAction( action );
                                this._removeInactiveAction( action );

                        }

                }

                const bindingsByRoot = this._bindingsByRootAndName,
                        bindingByName = bindingsByRoot[ rootUuid ];

                if ( bindingByName !== undefined ) {

                        for ( const trackName in bindingByName ) {

                                const binding = bindingByName[ trackName ];
                                binding.restoreOriginalState();
                                this._removeInactiveBinding( binding );

                        }

                }

        },

        // remove a targeted clip from the cache
        uncacheAction: function ( clip, optionalRoot ) {

                const action = this.existingAction( clip, optionalRoot );

                if ( action !== null ) {

                        this._deactivateAction( action );
                        this._removeInactiveAction( action );

                }

        }

} );

class Uniform {

        constructor( value ) {

                if ( typeof value === 'string' ) {

                        console.warn( 'THREE.Uniform: Type parameter is no longer needed.' );
                        value = arguments[ 1 ];

                }

                this.value = value;

        }

        clone() {

                return new Uniform( this.value.clone === undefined ? this.value : this.value.clone() );

        }

}

function InstancedInterleavedBuffer( array, stride, meshPerAttribute ) {

        InterleavedBuffer.call( this, array, stride );

        this.meshPerAttribute = meshPerAttribute || 1;

}

InstancedInterleavedBuffer.prototype = Object.assign( Object.create( InterleavedBuffer.prototype ), {

        constructor: InstancedInterleavedBuffer,

        isInstancedInterleavedBuffer: true,

        copy: function ( source ) {

                InterleavedBuffer.prototype.copy.call( this, source );

                this.meshPerAttribute = source.meshPerAttribute;

                return this;

        },

        clone: function ( data ) {

                const ib = InterleavedBuffer.prototype.clone.call( this, data );

                ib.meshPerAttribute = this.meshPerAttribute;

                return ib;

        },

        toJSON: function ( data ) {

                const json = InterleavedBuffer.prototype.toJSON.call( this, data );

                json.isInstancedInterleavedBuffer = true;
                json.meshPerAttribute = this.meshPerAttribute;

                return json;

        }

} );

function GLBufferAttribute( buffer, type, itemSize, elementSize, count ) {

        this.buffer = buffer;
        this.type = type;
        this.itemSize = itemSize;
        this.elementSize = elementSize;
        this.count = count;

        this.version = 0;

}

Object.defineProperty( GLBufferAttribute.prototype, 'needsUpdate', {

        set: function ( value ) {

                if ( value === true ) this.version ++;

        }

} );

Object.assign( GLBufferAttribute.prototype, {

        isGLBufferAttribute: true,

        setBuffer: function ( buffer ) {

                this.buffer = buffer;

                return this;

        },

        setType: function ( type, elementSize ) {

                this.type = type;
                this.elementSize = elementSize;

                return this;

        },

        setItemSize: function ( itemSize ) {

                this.itemSize = itemSize;

                return this;

        },

        setCount: function ( count ) {

                this.count = count;

                return this;

        },

} );

function Raycaster( origin, direction, near, far ) {

        this.ray = new Ray( origin, direction );
        // direction is assumed to be normalized (for accurate distance calculations)

        this.near = near || 0;
        this.far = far || Infinity;
        this.camera = null;
        this.layers = new Layers();

        this.params = {
                Mesh: {},
                Line: { threshold: 1 },
                LOD: {},
                Points: { threshold: 1 },
                Sprite: {}
        };

        Object.defineProperties( this.params, {
                PointCloud: {
                        get: function () {

                                console.warn( 'THREE.Raycaster: params.PointCloud has been renamed to params.Points.' );
                                return this.Points;

                        }
                }
        } );

}

function ascSort( a, b ) {

        return a.distance - b.distance;

}

function intersectObject( object, raycaster, intersects, recursive ) {

        if ( object.layers.test( raycaster.layers ) ) {

                object.raycast( raycaster, intersects );

        }

        if ( recursive === true ) {

                const children = object.children;

                for ( let i = 0, l = children.length; i < l; i ++ ) {

                        intersectObject( children[ i ], raycaster, intersects, true );

                }

        }

}

Object.assign( Raycaster.prototype, {

        set: function ( origin, direction ) {

                // direction is assumed to be normalized (for accurate distance calculations)

                this.ray.set( origin, direction );

        },

        setFromCamera: function ( coords, camera ) {

                if ( ( camera && camera.isPerspectiveCamera ) ) {

                        this.ray.origin.setFromMatrixPosition( camera.matrixWorld );
                        this.ray.direction.set( coords.x, coords.y, 0.5 ).unproject( camera ).sub( this.ray.origin ).normalize();
                        this.camera = camera;

                } else if ( ( camera && camera.isOrthographicCamera ) ) {

                        this.ray.origin.set( coords.x, coords.y, ( camera.near + camera.far ) / ( camera.near - camera.far ) ).unproject( camera ); // set origin in plane of camera
                        this.ray.direction.set( 0, 0, - 1 ).transformDirection( camera.matrixWorld );
                        this.camera = camera;

                } else {

                        console.error( 'THREE.Raycaster: Unsupported camera type.' );

                }

        },

        intersectObject: function ( object, recursive, optionalTarget ) {

                const intersects = optionalTarget || [];

                intersectObject( object, this, intersects, recursive );

                intersects.sort( ascSort );

                return intersects;

        },

        intersectObjects: function ( objects, recursive, optionalTarget ) {

                const intersects = optionalTarget || [];

                if ( Array.isArray( objects ) === false ) {

                        console.warn( 'THREE.Raycaster.intersectObjects: objects is not an Array.' );
                        return intersects;

                }

                for ( let i = 0, l = objects.length; i < l; i ++ ) {

                        intersectObject( objects[ i ], this, intersects, recursive );

                }

                intersects.sort( ascSort );

                return intersects;

        }

} );

/**
 * Ref: https://en.wikipedia.org/wiki/Spherical_coordinate_system
 *
 * The polar angle (phi) is measured from the positive y-axis. The positive y-axis is up.
 * The azimuthal angle (theta) is measured from the positive z-axis.
 */

class Spherical {

        constructor( radius = 1, phi = 0, theta = 0 ) {

                this.radius = radius;
                this.phi = phi; // polar angle
                this.theta = theta; // azimuthal angle

                return this;

        }

        set( radius, phi, theta ) {

                this.radius = radius;
                this.phi = phi;
                this.theta = theta;

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( other ) {

                this.radius = other.radius;
                this.phi = other.phi;
                this.theta = other.theta;

                return this;

        }

        // restrict phi to be betwee EPS and PI-EPS
        makeSafe() {

                const EPS = 0.000001;
                this.phi = Math.max( EPS, Math.min( Math.PI - EPS, this.phi ) );

                return this;

        }

        setFromVector3( v ) {

                return this.setFromCartesianCoords( v.x, v.y, v.z );

        }

        setFromCartesianCoords( x, y, z ) {

                this.radius = Math.sqrt( x * x + y * y + z * z );

                if ( this.radius === 0 ) {

                        this.theta = 0;
                        this.phi = 0;

                } else {

                        this.theta = Math.atan2( x, z );
                        this.phi = Math.acos( MathUtils.clamp( y / this.radius, - 1, 1 ) );

                }

                return this;

        }

}

/**
 * Ref: https://en.wikipedia.org/wiki/Cylindrical_coordinate_system
 */

class Cylindrical {

        constructor( radius, theta, y ) {

                this.radius = ( radius !== undefined ) ? radius : 1.0; // distance from the origin to a point in the x-z plane
                this.theta = ( theta !== undefined ) ? theta : 0; // counterclockwise angle in the x-z plane measured in radians from the positive z-axis
                this.y = ( y !== undefined ) ? y : 0; // height above the x-z plane

                return this;

        }

        set( radius, theta, y ) {

                this.radius = radius;
                this.theta = theta;
                this.y = y;

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( other ) {

                this.radius = other.radius;
                this.theta = other.theta;
                this.y = other.y;

                return this;

        }

        setFromVector3( v ) {

                return this.setFromCartesianCoords( v.x, v.y, v.z );

        }

        setFromCartesianCoords( x, y, z ) {

                this.radius = Math.sqrt( x * x + z * z );
                this.theta = Math.atan2( x, z );
                this.y = y;

                return this;

        }

}

const _vector$7 = /*@__PURE__*/ new Vector2();

class Box2 {

        constructor( min, max ) {

                Object.defineProperty( this, 'isBox2', { value: true } );

                this.min = ( min !== undefined ) ? min : new Vector2( + Infinity, + Infinity );
                this.max = ( max !== undefined ) ? max : new Vector2( - Infinity, - Infinity );

        }

        set( min, max ) {

                this.min.copy( min );
                this.max.copy( max );

                return this;

        }

        setFromPoints( points ) {

                this.makeEmpty();

                for ( let i = 0, il = points.length; i < il; i ++ ) {

                        this.expandByPoint( points[ i ] );

                }

                return this;

        }

        setFromCenterAndSize( center, size ) {

                const halfSize = _vector$7.copy( size ).multiplyScalar( 0.5 );
                this.min.copy( center ).sub( halfSize );
                this.max.copy( center ).add( halfSize );

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( box ) {

                this.min.copy( box.min );
                this.max.copy( box.max );

                return this;

        }

        makeEmpty() {

                this.min.x = this.min.y = + Infinity;
                this.max.x = this.max.y = - Infinity;

                return this;

        }

        isEmpty() {

                // this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes

                return ( this.max.x < this.min.x ) || ( this.max.y < this.min.y );

        }

        getCenter( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Box2: .getCenter() target is now required' );
                        target = new Vector2();

                }

                return this.isEmpty() ? target.set( 0, 0 ) : target.addVectors( this.min, this.max ).multiplyScalar( 0.5 );

        }

        getSize( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Box2: .getSize() target is now required' );
                        target = new Vector2();

                }

                return this.isEmpty() ? target.set( 0, 0 ) : target.subVectors( this.max, this.min );

        }

        expandByPoint( point ) {

                this.min.min( point );
                this.max.max( point );

                return this;

        }

        expandByVector( vector ) {

                this.min.sub( vector );
                this.max.add( vector );

                return this;

        }

        expandByScalar( scalar ) {

                this.min.addScalar( - scalar );
                this.max.addScalar( scalar );

                return this;

        }

        containsPoint( point ) {

                return point.x < this.min.x || point.x > this.max.x ||
                        point.y < this.min.y || point.y > this.max.y ? false : true;

        }

        containsBox( box ) {

                return this.min.x <= box.min.x && box.max.x <= this.max.x &&
                        this.min.y <= box.min.y && box.max.y <= this.max.y;

        }

        getParameter( point, target ) {

                // This can potentially have a divide by zero if the box
                // has a size dimension of 0.

                if ( target === undefined ) {

                        console.warn( 'THREE.Box2: .getParameter() target is now required' );
                        target = new Vector2();

                }

                return target.set(
                        ( point.x - this.min.x ) / ( this.max.x - this.min.x ),
                        ( point.y - this.min.y ) / ( this.max.y - this.min.y )
                );

        }

        intersectsBox( box ) {

                // using 4 splitting planes to rule out intersections

                return box.max.x < this.min.x || box.min.x > this.max.x ||
                        box.max.y < this.min.y || box.min.y > this.max.y ? false : true;

        }

        clampPoint( point, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Box2: .clampPoint() target is now required' );
                        target = new Vector2();

                }

                return target.copy( point ).clamp( this.min, this.max );

        }

        distanceToPoint( point ) {

                const clampedPoint = _vector$7.copy( point ).clamp( this.min, this.max );
                return clampedPoint.sub( point ).length();

        }

        intersect( box ) {

                this.min.max( box.min );
                this.max.min( box.max );

                return this;

        }

        union( box ) {

                this.min.min( box.min );
                this.max.max( box.max );

                return this;

        }

        translate( offset ) {

                this.min.add( offset );
                this.max.add( offset );

                return this;

        }

        equals( box ) {

                return box.min.equals( this.min ) && box.max.equals( this.max );

        }

}

const _startP = /*@__PURE__*/ new Vector3();
const _startEnd = /*@__PURE__*/ new Vector3();

class Line3 {

        constructor( start, end ) {

                this.start = ( start !== undefined ) ? start : new Vector3();
                this.end = ( end !== undefined ) ? end : new Vector3();

        }

        set( start, end ) {

                this.start.copy( start );
                this.end.copy( end );

                return this;

        }

        clone() {

                return new this.constructor().copy( this );

        }

        copy( line ) {

                this.start.copy( line.start );
                this.end.copy( line.end );

                return this;

        }

        getCenter( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Line3: .getCenter() target is now required' );
                        target = new Vector3();

                }

                return target.addVectors( this.start, this.end ).multiplyScalar( 0.5 );

        }

        delta( target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Line3: .delta() target is now required' );
                        target = new Vector3();

                }

                return target.subVectors( this.end, this.start );

        }

        distanceSq() {

                return this.start.distanceToSquared( this.end );

        }

        distance() {

                return this.start.distanceTo( this.end );

        }

        at( t, target ) {

                if ( target === undefined ) {

                        console.warn( 'THREE.Line3: .at() target is now required' );
                        target = new Vector3();

                }

                return this.delta( target ).multiplyScalar( t ).add( this.start );

        }

        closestPointToPointParameter( point, clampToLine ) {

                _startP.subVectors( point, this.start );
                _startEnd.subVectors( this.end, this.start );

                const startEnd2 = _startEnd.dot( _startEnd );
                const startEnd_startP = _startEnd.dot( _startP );

                let t = startEnd_startP / startEnd2;

                if ( clampToLine ) {

                        t = MathUtils.clamp( t, 0, 1 );

                }

                return t;

        }

        closestPointToPoint( point, clampToLine, target ) {

                const t = this.closestPointToPointParameter( point, clampToLine );

                if ( target === undefined ) {

                        console.warn( 'THREE.Line3: .closestPointToPoint() target is now required' );
                        target = new Vector3();

                }

                return this.delta( target ).multiplyScalar( t ).add( this.start );

        }

        applyMatrix4( matrix ) {

                this.start.applyMatrix4( matrix );
                this.end.applyMatrix4( matrix );

                return this;

        }

        equals( line ) {

                return line.start.equals( this.start ) && line.end.equals( this.end );

        }

}

function ImmediateRenderObject( material ) {

        Object3D.call( this );

        this.material = material;
        this.render = function ( /* renderCallback */ ) {};

        this.hasPositions = false;
        this.hasNormals = false;
        this.hasColors = false;
        this.hasUvs = false;

        this.positionArray = null;
        this.normalArray = null;
        this.colorArray = null;
        this.uvArray = null;

        this.count = 0;

}

ImmediateRenderObject.prototype = Object.create( Object3D.prototype );
ImmediateRenderObject.prototype.constructor = ImmediateRenderObject;

ImmediateRenderObject.prototype.isImmediateRenderObject = true;

const _vector$8 = /*@__PURE__*/ new Vector3();

class SpotLightHelper extends Object3D {

        constructor( light, color ) {

                super();
                this.light = light;
                this.light.updateMatrixWorld();

                this.matrix = light.matrixWorld;
                this.matrixAutoUpdate = false;

                this.color = color;

                const geometry = new BufferGeometry();

                const positions = [
                        0, 0, 0,        0, 0, 1,
                        0, 0, 0,        1, 0, 1,
                        0, 0, 0,        - 1, 0, 1,
                        0, 0, 0,        0, 1, 1,
                        0, 0, 0,        0, - 1, 1
                ];

                for ( let i = 0, j = 1, l = 32; i < l; i ++, j ++ ) {

                        const p1 = ( i / l ) * Math.PI * 2;
                        const p2 = ( j / l ) * Math.PI * 2;

                        positions.push(
                                Math.cos( p1 ), Math.sin( p1 ), 1,
                                Math.cos( p2 ), Math.sin( p2 ), 1
                        );

                }

                geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );

                const material = new LineBasicMaterial( { fog: false, toneMapped: false } );

                this.cone = new LineSegments( geometry, material );
                this.add( this.cone );

                this.update();

        }

        dispose() {

                this.cone.geometry.dispose();
                this.cone.material.dispose();

        }

        update() {

                this.light.updateMatrixWorld();

                const coneLength = this.light.distance ? this.light.distance : 1000;
                const coneWidth = coneLength * Math.tan( this.light.angle );

                this.cone.scale.set( coneWidth, coneWidth, coneLength );

                _vector$8.setFromMatrixPosition( this.light.target.matrixWorld );

                this.cone.lookAt( _vector$8 );

                if ( this.color !== undefined ) {

                        this.cone.material.color.set( this.color );

                } else {

                        this.cone.material.color.copy( this.light.color );

                }

        }

}

const _vector$9 = /*@__PURE__*/ new Vector3();
const _boneMatrix = /*@__PURE__*/ new Matrix4();
const _matrixWorldInv = /*@__PURE__*/ new Matrix4();


class SkeletonHelper extends LineSegments {

        constructor( object ) {

                const bones = getBoneList( object );

                const geometry = new BufferGeometry();

                const vertices = [];
                const colors = [];

                const color1 = new Color( 0, 0, 1 );
                const color2 = new Color( 0, 1, 0 );

                for ( let i = 0; i < bones.length; i ++ ) {

                        const bone = bones[ i ];

                        if ( bone.parent && bone.parent.isBone ) {

                                vertices.push( 0, 0, 0 );
                                vertices.push( 0, 0, 0 );
                                colors.push( color1.r, color1.g, color1.b );
                                colors.push( color2.r, color2.g, color2.b );

                        }

                }

                geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

                const material = new LineBasicMaterial( { vertexColors: true, depthTest: false, depthWrite: false, toneMapped: false, transparent: true } );

                super( geometry, material );

                this.type = 'SkeletonHelper';
                this.isSkeletonHelper = true;

                this.root = object;
                this.bones = bones;

                this.matrix = object.matrixWorld;
                this.matrixAutoUpdate = false;

        }

        updateMatrixWorld( force ) {

                const bones = this.bones;

                const geometry = this.geometry;
                const position = geometry.getAttribute( 'position' );

                _matrixWorldInv.copy( this.root.matrixWorld ).invert();

                for ( let i = 0, j = 0; i < bones.length; i ++ ) {

                        const bone = bones[ i ];

                        if ( bone.parent && bone.parent.isBone ) {

                                _boneMatrix.multiplyMatrices( _matrixWorldInv, bone.matrixWorld );
                                _vector$9.setFromMatrixPosition( _boneMatrix );
                                position.setXYZ( j, _vector$9.x, _vector$9.y, _vector$9.z );

                                _boneMatrix.multiplyMatrices( _matrixWorldInv, bone.parent.matrixWorld );
                                _vector$9.setFromMatrixPosition( _boneMatrix );
                                position.setXYZ( j + 1, _vector$9.x, _vector$9.y, _vector$9.z );

                                j += 2;

                        }

                }

                geometry.getAttribute( 'position' ).needsUpdate = true;

                super.updateMatrixWorld( force );

        }

}


function getBoneList( object ) {

        const boneList = [];

        if ( object && object.isBone ) {

                boneList.push( object );

        }

        for ( let i = 0; i < object.children.length; i ++ ) {

                boneList.push.apply( boneList, getBoneList( object.children[ i ] ) );

        }

        return boneList;

}

class PointLightHelper extends Mesh {

        constructor( light, sphereSize, color ) {

                const geometry = new SphereBufferGeometry( sphereSize, 4, 2 );
                const material = new MeshBasicMaterial( { wireframe: true, fog: false, toneMapped: false } );

                super( geometry, material );

                this.light = light;
                this.light.updateMatrixWorld();

                this.color = color;

                this.type = 'PointLightHelper';

                this.matrix = this.light.matrixWorld;
                this.matrixAutoUpdate = false;

                this.update();


                /*
        // TODO: delete this comment?
        const distanceGeometry = new THREE.IcosahedronBufferGeometry( 1, 2 );
        const distanceMaterial = new THREE.MeshBasicMaterial( { color: hexColor, fog: false, wireframe: true, opacity: 0.1, transparent: true } );

        this.lightSphere = new THREE.Mesh( bulbGeometry, bulbMaterial );
        this.lightDistance = new THREE.Mesh( distanceGeometry, distanceMaterial );

        const d = light.distance;

        if ( d === 0.0 ) {

                this.lightDistance.visible = false;

        } else {

                this.lightDistance.scale.set( d, d, d );

        }

        this.add( this.lightDistance );
        */

        }

        dispose() {

                this.geometry.dispose();
                this.material.dispose();

        }

        update() {

                if ( this.color !== undefined ) {

                        this.material.color.set( this.color );

                } else {

                        this.material.color.copy( this.light.color );

                }

                /*
                const d = this.light.distance;

                if ( d === 0.0 ) {

                        this.lightDistance.visible = false;

                } else {

                        this.lightDistance.visible = true;
                        this.lightDistance.scale.set( d, d, d );

                }
                */

        }

}

const _vector$a = /*@__PURE__*/ new Vector3();
const _color1 = /*@__PURE__*/ new Color();
const _color2 = /*@__PURE__*/ new Color();

class HemisphereLightHelper extends Object3D {

        constructor( light, size, color ) {

                super();
                this.light = light;
                this.light.updateMatrixWorld();

                this.matrix = light.matrixWorld;
                this.matrixAutoUpdate = false;

                this.color = color;

                const geometry = new OctahedronBufferGeometry( size );
                geometry.rotateY( Math.PI * 0.5 );

                this.material = new MeshBasicMaterial( { wireframe: true, fog: false, toneMapped: false } );
                if ( this.color === undefined ) this.material.vertexColors = true;

                const position = geometry.getAttribute( 'position' );
                const colors = new Float32Array( position.count * 3 );

                geometry.setAttribute( 'color', new BufferAttribute( colors, 3 ) );

                this.add( new Mesh( geometry, this.material ) );

                this.update();

        }

        dispose() {

                this.children[ 0 ].geometry.dispose();
                this.children[ 0 ].material.dispose();

        }

        update() {

                const mesh = this.children[ 0 ];

                if ( this.color !== undefined ) {

                        this.material.color.set( this.color );

                } else {

                        const colors = mesh.geometry.getAttribute( 'color' );

                        _color1.copy( this.light.color );
                        _color2.copy( this.light.groundColor );

                        for ( let i = 0, l = colors.count; i < l; i ++ ) {

                                const color = ( i < ( l / 2 ) ) ? _color1 : _color2;

                                colors.setXYZ( i, color.r, color.g, color.b );

                        }

                        colors.needsUpdate = true;

                }

                mesh.lookAt( _vector$a.setFromMatrixPosition( this.light.matrixWorld ).negate() );

        }

}

class GridHelper extends LineSegments {

        constructor( size = 10, divisions = 10, color1 = 0x444444, color2 = 0x888888 ) {

                color1 = new Color( color1 );
                color2 = new Color( color2 );

                const center = divisions / 2;
                const step = size / divisions;
                const halfSize = size / 2;

                const vertices = [], colors = [];

                for ( let i = 0, j = 0, k = - halfSize; i <= divisions; i ++, k += step ) {

                        vertices.push( - halfSize, 0, k, halfSize, 0, k );
                        vertices.push( k, 0, - halfSize, k, 0, halfSize );

                        const color = i === center ? color1 : color2;

                        color.toArray( colors, j ); j += 3;
                        color.toArray( colors, j ); j += 3;
                        color.toArray( colors, j ); j += 3;
                        color.toArray( colors, j ); j += 3;

                }

                const geometry = new BufferGeometry();
                geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

                const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );

                super( geometry, material );

                this.type = 'GridHelper';

        }

}

class PolarGridHelper extends LineSegments {

        constructor( radius = 10, radials = 16, circles = 8, divisions = 64, color1 = 0x444444, color2 = 0x888888 ) {

                color1 = new Color( color1 );
                color2 = new Color( color2 );

                const vertices = [];
                const colors = [];

                // create the radials

                for ( let i = 0; i <= radials; i ++ ) {

                        const v = ( i / radials ) * ( Math.PI * 2 );

                        const x = Math.sin( v ) * radius;
                        const z = Math.cos( v ) * radius;

                        vertices.push( 0, 0, 0 );
                        vertices.push( x, 0, z );

                        const color = ( i & 1 ) ? color1 : color2;

                        colors.push( color.r, color.g, color.b );
                        colors.push( color.r, color.g, color.b );

                }

                // create the circles

                for ( let i = 0; i <= circles; i ++ ) {

                        const color = ( i & 1 ) ? color1 : color2;

                        const r = radius - ( radius / circles * i );

                        for ( let j = 0; j < divisions; j ++ ) {

                                // first vertex

                                let v = ( j / divisions ) * ( Math.PI * 2 );

                                let x = Math.sin( v ) * r;
                                let z = Math.cos( v ) * r;

                                vertices.push( x, 0, z );
                                colors.push( color.r, color.g, color.b );

                                // second vertex

                                v = ( ( j + 1 ) / divisions ) * ( Math.PI * 2 );

                                x = Math.sin( v ) * r;
                                z = Math.cos( v ) * r;

                                vertices.push( x, 0, z );
                                colors.push( color.r, color.g, color.b );

                        }

                }

                const geometry = new BufferGeometry();
                geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

                const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );

                super( geometry, material );

                this.type = 'PolarGridHelper';

        }

}

const _v1$6 = /*@__PURE__*/ new Vector3();
const _v2$3 = /*@__PURE__*/ new Vector3();
const _v3$1 = /*@__PURE__*/ new Vector3();

class DirectionalLightHelper extends Object3D {

        constructor( light, size, color ) {

                super();
                this.light = light;
                this.light.updateMatrixWorld();

                this.matrix = light.matrixWorld;
                this.matrixAutoUpdate = false;

                this.color = color;

                if ( size === undefined ) size = 1;

                let geometry = new BufferGeometry();
                geometry.setAttribute( 'position', new Float32BufferAttribute( [
                        - size, size, 0,
                        size, size, 0,
                        size, - size, 0,
                        - size, - size, 0,
                        - size, size, 0
                ], 3 ) );

                const material = new LineBasicMaterial( { fog: false, toneMapped: false } );

                this.lightPlane = new Line( geometry, material );
                this.add( this.lightPlane );

                geometry = new BufferGeometry();
                geometry.setAttribute( 'position', new Float32BufferAttribute( [ 0, 0, 0, 0, 0, 1 ], 3 ) );

                this.targetLine = new Line( geometry, material );
                this.add( this.targetLine );

                this.update();

        }

        dispose() {

                this.lightPlane.geometry.dispose();
                this.lightPlane.material.dispose();
                this.targetLine.geometry.dispose();
                this.targetLine.material.dispose();

        }

        update() {

                _v1$6.setFromMatrixPosition( this.light.matrixWorld );
                _v2$3.setFromMatrixPosition( this.light.target.matrixWorld );
                _v3$1.subVectors( _v2$3, _v1$6 );

                this.lightPlane.lookAt( _v2$3 );

                if ( this.color !== undefined ) {

                        this.lightPlane.material.color.set( this.color );
                        this.targetLine.material.color.set( this.color );

                } else {

                        this.lightPlane.material.color.copy( this.light.color );
                        this.targetLine.material.color.copy( this.light.color );

                }

                this.targetLine.lookAt( _v2$3 );
                this.targetLine.scale.z = _v3$1.length();

        }

}

const _vector$b = /*@__PURE__*/ new Vector3();
const _camera = /*@__PURE__*/ new Camera();

/**
 *      - shows frustum, line of sight and up of the camera
 *      - suitable for fast updates
 *      - based on frustum visualization in lightgl.js shadowmap example
 *              http://evanw.github.com/lightgl.js/tests/shadowmap.html
 */

class CameraHelper extends LineSegments {

        constructor( camera ) {

                const geometry = new BufferGeometry();
                const material = new LineBasicMaterial( { color: 0xffffff, vertexColors: true, toneMapped: false } );

                const vertices = [];
                const colors = [];

                const pointMap = {};

                // colors

                const colorFrustum = new Color( 0xffaa00 );
                const colorCone = new Color( 0xff0000 );
                const colorUp = new Color( 0x00aaff );
                const colorTarget = new Color( 0xffffff );
                const colorCross = new Color( 0x333333 );

                // near

                addLine( 'n1', 'n2', colorFrustum );
                addLine( 'n2', 'n4', colorFrustum );
                addLine( 'n4', 'n3', colorFrustum );
                addLine( 'n3', 'n1', colorFrustum );

                // far

                addLine( 'f1', 'f2', colorFrustum );
                addLine( 'f2', 'f4', colorFrustum );
                addLine( 'f4', 'f3', colorFrustum );
                addLine( 'f3', 'f1', colorFrustum );

                // sides

                addLine( 'n1', 'f1', colorFrustum );
                addLine( 'n2', 'f2', colorFrustum );
                addLine( 'n3', 'f3', colorFrustum );
                addLine( 'n4', 'f4', colorFrustum );

                // cone

                addLine( 'p', 'n1', colorCone );
                addLine( 'p', 'n2', colorCone );
                addLine( 'p', 'n3', colorCone );
                addLine( 'p', 'n4', colorCone );

                // up

                addLine( 'u1', 'u2', colorUp );
                addLine( 'u2', 'u3', colorUp );
                addLine( 'u3', 'u1', colorUp );

                // target

                addLine( 'c', 't', colorTarget );
                addLine( 'p', 'c', colorCross );

                // cross

                addLine( 'cn1', 'cn2', colorCross );
                addLine( 'cn3', 'cn4', colorCross );

                addLine( 'cf1', 'cf2', colorCross );
                addLine( 'cf3', 'cf4', colorCross );

                function addLine( a, b, color ) {

                        addPoint( a, color );
                        addPoint( b, color );

                }

                function addPoint( id, color ) {

                        vertices.push( 0, 0, 0 );
                        colors.push( color.r, color.g, color.b );

                        if ( pointMap[ id ] === undefined ) {

                                pointMap[ id ] = [];

                        }

                        pointMap[ id ].push( ( vertices.length / 3 ) - 1 );

                }

                geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

                super( geometry, material );

                this.type = 'CameraHelper';

                this.camera = camera;
                if ( this.camera.updateProjectionMatrix ) this.camera.updateProjectionMatrix();

                this.matrix = camera.matrixWorld;
                this.matrixAutoUpdate = false;

                this.pointMap = pointMap;

                this.update();

        }

        update() {

                const geometry = this.geometry;
                const pointMap = this.pointMap;

                const w = 1, h = 1;

                // we need just camera projection matrix inverse
                // world matrix must be identity

                _camera.projectionMatrixInverse.copy( this.camera.projectionMatrixInverse );

                // center / target

                setPoint( 'c', pointMap, geometry, _camera, 0, 0, - 1 );
                setPoint( 't', pointMap, geometry, _camera, 0, 0, 1 );

                // near

                setPoint( 'n1', pointMap, geometry, _camera, - w, - h, - 1 );
                setPoint( 'n2', pointMap, geometry, _camera, w, - h, - 1 );
                setPoint( 'n3', pointMap, geometry, _camera, - w, h, - 1 );
                setPoint( 'n4', pointMap, geometry, _camera, w, h, - 1 );

                // far

                setPoint( 'f1', pointMap, geometry, _camera, - w, - h, 1 );
                setPoint( 'f2', pointMap, geometry, _camera, w, - h, 1 );
                setPoint( 'f3', pointMap, geometry, _camera, - w, h, 1 );
                setPoint( 'f4', pointMap, geometry, _camera, w, h, 1 );

                // up

                setPoint( 'u1', pointMap, geometry, _camera, w * 0.7, h * 1.1, - 1 );
                setPoint( 'u2', pointMap, geometry, _camera, - w * 0.7, h * 1.1, - 1 );
                setPoint( 'u3', pointMap, geometry, _camera, 0, h * 2, - 1 );

                // cross

                setPoint( 'cf1', pointMap, geometry, _camera, - w, 0, 1 );
                setPoint( 'cf2', pointMap, geometry, _camera, w, 0, 1 );
                setPoint( 'cf3', pointMap, geometry, _camera, 0, - h, 1 );
                setPoint( 'cf4', pointMap, geometry, _camera, 0, h, 1 );

                setPoint( 'cn1', pointMap, geometry, _camera, - w, 0, - 1 );
                setPoint( 'cn2', pointMap, geometry, _camera, w, 0, - 1 );
                setPoint( 'cn3', pointMap, geometry, _camera, 0, - h, - 1 );
                setPoint( 'cn4', pointMap, geometry, _camera, 0, h, - 1 );

                geometry.getAttribute( 'position' ).needsUpdate = true;

        }

}


function setPoint( point, pointMap, geometry, camera, x, y, z ) {

        _vector$b.set( x, y, z ).unproject( camera );

        const points = pointMap[ point ];

        if ( points !== undefined ) {

                const position = geometry.getAttribute( 'position' );

                for ( let i = 0, l = points.length; i < l; i ++ ) {

                        position.setXYZ( points[ i ], _vector$b.x, _vector$b.y, _vector$b.z );

                }

        }

}

const _box$3 = /*@__PURE__*/ new Box3();

class BoxHelper extends LineSegments {

        constructor( object, color = 0xffff00 ) {

                const indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );
                const positions = new Float32Array( 8 * 3 );

                const geometry = new BufferGeometry();
                geometry.setIndex( new BufferAttribute( indices, 1 ) );
                geometry.setAttribute( 'position', new BufferAttribute( positions, 3 ) );

                super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );

                this.object = object;
                this.type = 'BoxHelper';

                this.matrixAutoUpdate = false;

                this.update();

        }

        update( object ) {

                if ( object !== undefined ) {

                        console.warn( 'THREE.BoxHelper: .update() has no longer arguments.' );

                }

                if ( this.object !== undefined ) {

                        _box$3.setFromObject( this.object );

                }

                if ( _box$3.isEmpty() ) return;

                const min = _box$3.min;
                const max = _box$3.max;

                /*
                        5____4
                1/___0/|
                | 6__|_7
                2/___3/

                0: max.x, max.y, max.z
                1: min.x, max.y, max.z
                2: min.x, min.y, max.z
                3: max.x, min.y, max.z
                4: max.x, max.y, min.z
                5: min.x, max.y, min.z
                6: min.x, min.y, min.z
                7: max.x, min.y, min.z
                */

                const position = this.geometry.attributes.position;
                const array = position.array;

                array[ 0 ] = max.x; array[ 1 ] = max.y; array[ 2 ] = max.z;
                array[ 3 ] = min.x; array[ 4 ] = max.y; array[ 5 ] = max.z;
                array[ 6 ] = min.x; array[ 7 ] = min.y; array[ 8 ] = max.z;
                array[ 9 ] = max.x; array[ 10 ] = min.y; array[ 11 ] = max.z;
                array[ 12 ] = max.x; array[ 13 ] = max.y; array[ 14 ] = min.z;
                array[ 15 ] = min.x; array[ 16 ] = max.y; array[ 17 ] = min.z;
                array[ 18 ] = min.x; array[ 19 ] = min.y; array[ 20 ] = min.z;
                array[ 21 ] = max.x; array[ 22 ] = min.y; array[ 23 ] = min.z;

                position.needsUpdate = true;

                this.geometry.computeBoundingSphere();


        }

        setFromObject( object ) {

                this.object = object;
                this.update();

                return this;

        }

        copy( source ) {

                LineSegments.prototype.copy.call( this, source );

                this.object = source.object;

                return this;

        }

}

class Box3Helper extends LineSegments {

        constructor( box, color = 0xffff00 ) {

                const indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );

                const positions = [ 1, 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, - 1, 1, 1, 1, - 1, - 1, 1, - 1, - 1, - 1, - 1, 1, - 1, - 1 ];

                const geometry = new BufferGeometry();

                geometry.setIndex( new BufferAttribute( indices, 1 ) );

                geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );

                super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );

                this.box = box;

                this.type = 'Box3Helper';

                this.geometry.computeBoundingSphere();

        }

        updateMatrixWorld( force ) {

                const box = this.box;

                if ( box.isEmpty() ) return;

                box.getCenter( this.position );

                box.getSize( this.scale );

                this.scale.multiplyScalar( 0.5 );

                super.updateMatrixWorld( force );

        }

}

class PlaneHelper extends Line {

        constructor( plane, size = 1, hex = 0xffff00 ) {

                const color = hex;

                const positions = [ 1, - 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, - 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0 ];

                const geometry = new BufferGeometry();
                geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );
                geometry.computeBoundingSphere();

                super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );

                this.type = 'PlaneHelper';

                this.plane = plane;

                this.size = size;

                const positions2 = [ 1, 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, 1, 1, - 1, - 1, 1, 1, - 1, 1 ];

                const geometry2 = new BufferGeometry();
                geometry2.setAttribute( 'position', new Float32BufferAttribute( positions2, 3 ) );
                geometry2.computeBoundingSphere();

                this.add( new Mesh( geometry2, new MeshBasicMaterial( { color: color, opacity: 0.2, transparent: true, depthWrite: false, toneMapped: false } ) ) );

        }

        updateMatrixWorld( force ) {

                let scale = - this.plane.constant;

                if ( Math.abs( scale ) < 1e-8 ) scale = 1e-8; // sign does not matter

                this.scale.set( 0.5 * this.size, 0.5 * this.size, scale );

                this.children[ 0 ].material.side = ( scale < 0 ) ? BackSide : FrontSide; // renderer flips side when determinant < 0; flipping not wanted here

                this.lookAt( this.plane.normal );

                super.updateMatrixWorld( force );

        }

}

const _axis = /*@__PURE__*/ new Vector3();
let _lineGeometry, _coneGeometry;

class ArrowHelper extends Object3D {

        constructor( dir, origin, length, color, headLength, headWidth ) {

                super();
                // dir is assumed to be normalized

                this.type = 'ArrowHelper';

                if ( dir === undefined ) dir = new Vector3( 0, 0, 1 );
                if ( origin === undefined ) origin = new Vector3( 0, 0, 0 );
                if ( length === undefined ) length = 1;
                if ( color === undefined ) color = 0xffff00;
                if ( headLength === undefined ) headLength = 0.2 * length;
                if ( headWidth === undefined ) headWidth = 0.2 * headLength;

                if ( _lineGeometry === undefined ) {

                        _lineGeometry = new BufferGeometry();
                        _lineGeometry.setAttribute( 'position', new Float32BufferAttribute( [ 0, 0, 0, 0, 1, 0 ], 3 ) );

                        _coneGeometry = new CylinderBufferGeometry( 0, 0.5, 1, 5, 1 );
                        _coneGeometry.translate( 0, - 0.5, 0 );

                }

                this.position.copy( origin );

                this.line = new Line( _lineGeometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );
                this.line.matrixAutoUpdate = false;
                this.add( this.line );

                this.cone = new Mesh( _coneGeometry, new MeshBasicMaterial( { color: color, toneMapped: false } ) );
                this.cone.matrixAutoUpdate = false;
                this.add( this.cone );

                this.setDirection( dir );
                this.setLength( length, headLength, headWidth );

        }

        setDirection( dir ) {

                // dir is assumed to be normalized

                if ( dir.y > 0.99999 ) {

                        this.quaternion.set( 0, 0, 0, 1 );

                } else if ( dir.y < - 0.99999 ) {

                        this.quaternion.set( 1, 0, 0, 0 );

                } else {

                        _axis.set( dir.z, 0, - dir.x ).normalize();

                        const radians = Math.acos( dir.y );

                        this.quaternion.setFromAxisAngle( _axis, radians );

                }

        }

        setLength( length, headLength, headWidth ) {

                if ( headLength === undefined ) headLength = 0.2 * length;
                if ( headWidth === undefined ) headWidth = 0.2 * headLength;

                this.line.scale.set( 1, Math.max( 0.0001, length - headLength ), 1 ); // see #17458
                this.line.updateMatrix();

                this.cone.scale.set( headWidth, headLength, headWidth );
                this.cone.position.y = length;
                this.cone.updateMatrix();

        }

        setColor( color ) {

                this.line.material.color.set( color );
                this.cone.material.color.set( color );

        }

        copy( source ) {

                super.copy( source, false );

                this.line.copy( source.line );
                this.cone.copy( source.cone );

                return this;

        }

}

class AxesHelper extends LineSegments {

        constructor( size = 1 ) {

                const vertices = [
                        0, 0, 0,        size, 0, 0,
                        0, 0, 0,        0, size, 0,
                        0, 0, 0,        0, 0, size
                ];

                const colors = [
                        1, 0, 0,        1, 0.6, 0,
                        0, 1, 0,        0.6, 1, 0,
                        0, 0, 1,        0, 0.6, 1
                ];

                const geometry = new BufferGeometry();
                geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
                geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

                const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );

                super( geometry, material );

                this.type = 'AxesHelper';

        }

}

const _floatView = new Float32Array( 1 );
const _int32View = new Int32Array( _floatView.buffer );

const DataUtils = {

        // Converts float32 to float16 (stored as uint16 value).

        toHalfFloat: function ( val ) {

                // Source: http://gamedev.stackexchange.com/questions/17326/conversion-of-a-number-from-single-precision-floating-point-representation-to-a/17410#17410

                /* This method is faster than the OpenEXR implementation (very often
                * used, eg. in Ogre), with the additional benefit of rounding, inspired
                * by James Tursa?s half-precision code. */

                _floatView[ 0 ] = val;
                const x = _int32View[ 0 ];

                let bits = ( x >> 16 ) & 0x8000; /* Get the sign */
                let m = ( x >> 12 ) & 0x07ff; /* Keep one extra bit for rounding */
                const e = ( x >> 23 ) & 0xff; /* Using int is faster here */

                /* If zero, or denormal, or exponent underflows too much for a denormal
                        * half, return signed zero. */
                if ( e < 103 ) return bits;

                /* If NaN, return NaN. If Inf or exponent overflow, return Inf. */
                if ( e > 142 ) {

                        bits |= 0x7c00;
                        /* If exponent was 0xff and one mantissa bit was set, it means NaN,
                                                * not Inf, so make sure we set one mantissa bit too. */
                        bits |= ( ( e == 255 ) ? 0 : 1 ) && ( x & 0x007fffff );
                        return bits;

                }

                /* If exponent underflows but not too much, return a denormal */
                if ( e < 113 ) {

                        m |= 0x0800;
                        /* Extra rounding may overflow and set mantissa to 0 and exponent
                                * to 1, which is OK. */
                        bits |= ( m >> ( 114 - e ) ) + ( ( m >> ( 113 - e ) ) & 1 );
                        return bits;

                }

                bits |= ( ( e - 112 ) << 10 ) | ( m >> 1 );
                /* Extra rounding. An overflow will set mantissa to 0 and increment
                        * the exponent, which is OK. */
                bits += m & 1;
                return bits;

        }

};

const LOD_MIN = 4;
const LOD_MAX = 8;
const SIZE_MAX = Math.pow( 2, LOD_MAX );

// The standard deviations (radians) associated with the extra mips. These are
// chosen to approximate a Trowbridge-Reitz distribution function times the
// geometric shadowing function. These sigma values squared must match the
// variance #defines in cube_uv_reflection_fragment.glsl.js.
const EXTRA_LOD_SIGMA = [ 0.125, 0.215, 0.35, 0.446, 0.526, 0.582 ];

const TOTAL_LODS = LOD_MAX - LOD_MIN + 1 + EXTRA_LOD_SIGMA.length;

// The maximum length of the blur for loop. Smaller sigmas will use fewer
// samples and exit early, but not recompile the shader.
const MAX_SAMPLES = 20;

const ENCODINGS = {
        [ LinearEncoding ]: 0,
        [ sRGBEncoding ]: 1,
        [ RGBEEncoding ]: 2,
        [ RGBM7Encoding ]: 3,
        [ RGBM16Encoding ]: 4,
        [ RGBDEncoding ]: 5,
        [ GammaEncoding ]: 6
};

const _flatCamera = /*@__PURE__*/ new OrthographicCamera();
const { _lodPlanes, _sizeLods, _sigmas } = /*@__PURE__*/ _createPlanes();
let _oldTarget = null;

// Golden Ratio
const PHI = ( 1 + Math.sqrt( 5 ) ) / 2;
const INV_PHI = 1 / PHI;

// Vertices of a dodecahedron (except the opposites, which represent the
// same axis), used as axis directions evenly spread on a sphere.
const _axisDirections = [
        /*@__PURE__*/ new Vector3( 1, 1, 1 ),
        /*@__PURE__*/ new Vector3( - 1, 1, 1 ),
        /*@__PURE__*/ new Vector3( 1, 1, - 1 ),
        /*@__PURE__*/ new Vector3( - 1, 1, - 1 ),
        /*@__PURE__*/ new Vector3( 0, PHI, INV_PHI ),
        /*@__PURE__*/ new Vector3( 0, PHI, - INV_PHI ),
        /*@__PURE__*/ new Vector3( INV_PHI, 0, PHI ),
        /*@__PURE__*/ new Vector3( - INV_PHI, 0, PHI ),
        /*@__PURE__*/ new Vector3( PHI, INV_PHI, 0 ),
        /*@__PURE__*/ new Vector3( - PHI, INV_PHI, 0 ) ];

/**
 * This class generates a Prefiltered, Mipmapped Radiance Environment Map
 * (PMREM) from a cubeMap environment texture. This allows different levels of
 * blur to be quickly accessed based on material roughness. It is packed into a
 * special CubeUV format that allows us to perform custom interpolation so that
 * we can support nonlinear formats such as RGBE. Unlike a traditional mipmap
 * chain, it only goes down to the LOD_MIN level (above), and then creates extra
 * even more filtered 'mips' at the same LOD_MIN resolution, associated with
 * higher roughness levels. In this way we maintain resolution to smoothly
 * interpolate diffuse lighting while limiting sampling computation.
 */

class PMREMGenerator {

        constructor( renderer ) {

                this._renderer = renderer;
                this._pingPongRenderTarget = null;

                this._blurMaterial = _getBlurShader( MAX_SAMPLES );
                this._equirectShader = null;
                this._cubemapShader = null;

                this._compileMaterial( this._blurMaterial );

        }

        /**
         * Generates a PMREM from a supplied Scene, which can be faster than using an
         * image if networking bandwidth is low. Optional sigma specifies a blur radius
         * in radians to be applied to the scene before PMREM generation. Optional near
         * and far planes ensure the scene is rendered in its entirety (the cubeCamera
         * is placed at the origin).
         */
        fromScene( scene, sigma = 0, near = 0.1, far = 100 ) {

                _oldTarget = this._renderer.getRenderTarget();
                const cubeUVRenderTarget = this._allocateTargets();

                this._sceneToCubeUV( scene, near, far, cubeUVRenderTarget );
                if ( sigma > 0 ) {

                        this._blur( cubeUVRenderTarget, 0, 0, sigma );

                }

                this._applyPMREM( cubeUVRenderTarget );
                this._cleanup( cubeUVRenderTarget );

                return cubeUVRenderTarget;

        }

        /**
         * Generates a PMREM from an equirectangular texture, which can be either LDR
         * (RGBFormat) or HDR (RGBEFormat). The ideal input image size is 1k (1024 x 512),
         * as this matches best with the 256 x 256 cubemap output.
         */
        fromEquirectangular( equirectangular ) {

                return this._fromTexture( equirectangular );

        }

        /**
         * Generates a PMREM from an cubemap texture, which can be either LDR
         * (RGBFormat) or HDR (RGBEFormat). The ideal input cube size is 256 x 256,
         * as this matches best with the 256 x 256 cubemap output.
         */
        fromCubemap( cubemap ) {

                return this._fromTexture( cubemap );

        }

        /**
         * Pre-compiles the cubemap shader. You can get faster start-up by invoking this method during
         * your texture's network fetch for increased concurrency.
         */
        compileCubemapShader() {

                if ( this._cubemapShader === null ) {

                        this._cubemapShader = _getCubemapShader();
                        this._compileMaterial( this._cubemapShader );

                }

        }

        /**
         * Pre-compiles the equirectangular shader. You can get faster start-up by invoking this method during
         * your texture's network fetch for increased concurrency.
         */
        compileEquirectangularShader() {

                if ( this._equirectShader === null ) {

                        this._equirectShader = _getEquirectShader();
                        this._compileMaterial( this._equirectShader );

                }

        }

        /**
         * Disposes of the PMREMGenerator's internal memory. Note that PMREMGenerator is a static class,
         * so you should not need more than one PMREMGenerator object. If you do, calling dispose() on
         * one of them will cause any others to also become unusable.
         */
        dispose() {

                this._blurMaterial.dispose();

                if ( this._cubemapShader !== null ) this._cubemapShader.dispose();
                if ( this._equirectShader !== null ) this._equirectShader.dispose();

                for ( let i = 0; i < _lodPlanes.length; i ++ ) {

                        _lodPlanes[ i ].dispose();

                }

        }

        // private interface

        _cleanup( outputTarget ) {

                this._pingPongRenderTarget.dispose();
                this._renderer.setRenderTarget( _oldTarget );
                outputTarget.scissorTest = false;
                _setViewport( outputTarget, 0, 0, outputTarget.width, outputTarget.height );

        }

        _fromTexture( texture ) {

                _oldTarget = this._renderer.getRenderTarget();
                const cubeUVRenderTarget = this._allocateTargets( texture );
                this._textureToCubeUV( texture, cubeUVRenderTarget );
                this._applyPMREM( cubeUVRenderTarget );
                this._cleanup( cubeUVRenderTarget );

                return cubeUVRenderTarget;

        }

        _allocateTargets( texture ) { // warning: null texture is valid

                const params = {
                        magFilter: NearestFilter,
                        minFilter: NearestFilter,
                        generateMipmaps: false,
                        type: UnsignedByteType,
                        format: RGBEFormat,
                        encoding: _isLDR( texture ) ? texture.encoding : RGBEEncoding,
                        depthBuffer: false
                };

                const cubeUVRenderTarget = _createRenderTarget( params );
                cubeUVRenderTarget.depthBuffer = texture ? false : true;
                this._pingPongRenderTarget = _createRenderTarget( params );
                return cubeUVRenderTarget;

        }

        _compileMaterial( material ) {

                const tmpMesh = new Mesh( _lodPlanes[ 0 ], material );
                this._renderer.compile( tmpMesh, _flatCamera );

        }

        _sceneToCubeUV( scene, near, far, cubeUVRenderTarget ) {

                const fov = 90;
                const aspect = 1;
                const cubeCamera = new PerspectiveCamera( fov, aspect, near, far );
                const upSign = [ 1, - 1, 1, 1, 1, 1 ];
                const forwardSign = [ 1, 1, 1, - 1, - 1, - 1 ];
                const renderer = this._renderer;

                const outputEncoding = renderer.outputEncoding;
                const toneMapping = renderer.toneMapping;
                const clearColor = renderer.getClearColor();
                const clearAlpha = renderer.getClearAlpha();

                renderer.toneMapping = NoToneMapping;
                renderer.outputEncoding = LinearEncoding;

                let background = scene.background;
                if ( background && background.isColor ) {

                        background.convertSRGBToLinear();
                        // Convert linear to RGBE
                        const maxComponent = Math.max( background.r, background.g, background.b );
                        const fExp = Math.min( Math.max( Math.ceil( Math.log2( maxComponent ) ), - 128.0 ), 127.0 );
                        background = background.multiplyScalar( Math.pow( 2.0, - fExp ) );
                        const alpha = ( fExp + 128.0 ) / 255.0;
                        renderer.setClearColor( background, alpha );
                        scene.background = null;

                }

                for ( let i = 0; i < 6; i ++ ) {

                        const col = i % 3;
                        if ( col == 0 ) {

                                cubeCamera.up.set( 0, upSign[ i ], 0 );
                                cubeCamera.lookAt( forwardSign[ i ], 0, 0 );

                        } else if ( col == 1 ) {

                                cubeCamera.up.set( 0, 0, upSign[ i ] );
                                cubeCamera.lookAt( 0, forwardSign[ i ], 0 );

                        } else {

                                cubeCamera.up.set( 0, upSign[ i ], 0 );
                                cubeCamera.lookAt( 0, 0, forwardSign[ i ] );

                        }

                        _setViewport( cubeUVRenderTarget,
                                col * SIZE_MAX, i > 2 ? SIZE_MAX : 0, SIZE_MAX, SIZE_MAX );
                        renderer.setRenderTarget( cubeUVRenderTarget );
                        renderer.render( scene, cubeCamera );

                }

                renderer.toneMapping = toneMapping;
                renderer.outputEncoding = outputEncoding;
                renderer.setClearColor( clearColor, clearAlpha );

        }

        _textureToCubeUV( texture, cubeUVRenderTarget ) {

                const renderer = this._renderer;

                if ( texture.isCubeTexture ) {

                        if ( this._cubemapShader == null ) {

                                this._cubemapShader = _getCubemapShader();

                        }

                } else {

                        if ( this._equirectShader == null ) {

                                this._equirectShader = _getEquirectShader();

                        }

                }

                const material = texture.isCubeTexture ? this._cubemapShader : this._equirectShader;
                const mesh = new Mesh( _lodPlanes[ 0 ], material );

                const uniforms = material.uniforms;

                uniforms[ 'envMap' ].value = texture;

                if ( ! texture.isCubeTexture ) {

                        uniforms[ 'texelSize' ].value.set( 1.0 / texture.image.width, 1.0 / texture.image.height );

                }

                uniforms[ 'inputEncoding' ].value = ENCODINGS[ texture.encoding ];
                uniforms[ 'outputEncoding' ].value = ENCODINGS[ cubeUVRenderTarget.texture.encoding ];

                _setViewport( cubeUVRenderTarget, 0, 0, 3 * SIZE_MAX, 2 * SIZE_MAX );

                renderer.setRenderTarget( cubeUVRenderTarget );
                renderer.render( mesh, _flatCamera );

        }

        _applyPMREM( cubeUVRenderTarget ) {

                const renderer = this._renderer;
                const autoClear = renderer.autoClear;
                renderer.autoClear = false;

                for ( let i = 1; i < TOTAL_LODS; i ++ ) {

                        const sigma = Math.sqrt( _sigmas[ i ] * _sigmas[ i ] - _sigmas[ i - 1 ] * _sigmas[ i - 1 ] );

                        const poleAxis = _axisDirections[ ( i - 1 ) % _axisDirections.length ];

                        this._blur( cubeUVRenderTarget, i - 1, i, sigma, poleAxis );

                }

                renderer.autoClear = autoClear;

        }

        /**
         * This is a two-pass Gaussian blur for a cubemap. Normally this is done
         * vertically and horizontally, but this breaks down on a cube. Here we apply
         * the blur latitudinally (around the poles), and then longitudinally (towards
         * the poles) to approximate the orthogonally-separable blur. It is least
         * accurate at the poles, but still does a decent job.
         */
        _blur( cubeUVRenderTarget, lodIn, lodOut, sigma, poleAxis ) {

                const pingPongRenderTarget = this._pingPongRenderTarget;

                this._halfBlur(
                        cubeUVRenderTarget,
                        pingPongRenderTarget,
                        lodIn,
                        lodOut,
                        sigma,
                        'latitudinal',
                        poleAxis );

                this._halfBlur(
                        pingPongRenderTarget,
                        cubeUVRenderTarget,
                        lodOut,
                        lodOut,
                        sigma,
                        'longitudinal',
                        poleAxis );

        }

        _halfBlur( targetIn, targetOut, lodIn, lodOut, sigmaRadians, direction, poleAxis ) {

                const renderer = this._renderer;
                const blurMaterial = this._blurMaterial;

                if ( direction !== 'latitudinal' && direction !== 'longitudinal' ) {

                        console.error(
                                'blur direction must be either latitudinal or longitudinal!' );

                }

                // Number of standard deviations at which to cut off the discrete approximation.
                const STANDARD_DEVIATIONS = 3;

                const blurMesh = new Mesh( _lodPlanes[ lodOut ], blurMaterial );
                const blurUniforms = blurMaterial.uniforms;

                const pixels = _sizeLods[ lodIn ] - 1;
                const radiansPerPixel = isFinite( sigmaRadians ) ? Math.PI / ( 2 * pixels ) : 2 * Math.PI / ( 2 * MAX_SAMPLES - 1 );
                const sigmaPixels = sigmaRadians / radiansPerPixel;
                const samples = isFinite( sigmaRadians ) ? 1 + Math.floor( STANDARD_DEVIATIONS * sigmaPixels ) : MAX_SAMPLES;

                if ( samples > MAX_SAMPLES ) {

                        console.warn( `sigmaRadians, ${
                                sigmaRadians}, is too large and will clip, as it requested ${
                                samples} samples when the maximum is set to ${MAX_SAMPLES}` );

                }

                const weights = [];
                let sum = 0;

                for ( let i = 0; i < MAX_SAMPLES; ++ i ) {

                        const x = i / sigmaPixels;
                        const weight = Math.exp( - x * x / 2 );
                        weights.push( weight );

                        if ( i == 0 ) {

                                sum += weight;

                        } else if ( i < samples ) {

                                sum += 2 * weight;

                        }

                }

                for ( let i = 0; i < weights.length; i ++ ) {

                        weights[ i ] = weights[ i ] / sum;

                }

                blurUniforms[ 'envMap' ].value = targetIn.texture;
                blurUniforms[ 'samples' ].value = samples;
                blurUniforms[ 'weights' ].value = weights;
                blurUniforms[ 'latitudinal' ].value = direction === 'latitudinal';

                if ( poleAxis ) {

                        blurUniforms[ 'poleAxis' ].value = poleAxis;

                }

                blurUniforms[ 'dTheta' ].value = radiansPerPixel;
                blurUniforms[ 'mipInt' ].value = LOD_MAX - lodIn;
                blurUniforms[ 'inputEncoding' ].value = ENCODINGS[ targetIn.texture.encoding ];
                blurUniforms[ 'outputEncoding' ].value = ENCODINGS[ targetIn.texture.encoding ];

                const outputSize = _sizeLods[ lodOut ];
                const x = 3 * Math.max( 0, SIZE_MAX - 2 * outputSize );
                const y = ( lodOut === 0 ? 0 : 2 * SIZE_MAX ) + 2 * outputSize * ( lodOut > LOD_MAX - LOD_MIN ? lodOut - LOD_MAX + LOD_MIN : 0 );

                _setViewport( targetOut, x, y, 3 * outputSize, 2 * outputSize );
                renderer.setRenderTarget( targetOut );
                renderer.render( blurMesh, _flatCamera );

        }

}

function _isLDR( texture ) {

        if ( texture === undefined || texture.type !== UnsignedByteType ) return false;

        return texture.encoding === LinearEncoding || texture.encoding === sRGBEncoding || texture.encoding === GammaEncoding;

}

function _createPlanes() {

        const _lodPlanes = [];
        const _sizeLods = [];
        const _sigmas = [];

        let lod = LOD_MAX;

        for ( let i = 0; i < TOTAL_LODS; i ++ ) {

                const sizeLod = Math.pow( 2, lod );
                _sizeLods.push( sizeLod );
                let sigma = 1.0 / sizeLod;

                if ( i > LOD_MAX - LOD_MIN ) {

                        sigma = EXTRA_LOD_SIGMA[ i - LOD_MAX + LOD_MIN - 1 ];

                } else if ( i == 0 ) {

                        sigma = 0;

                }

                _sigmas.push( sigma );

                const texelSize = 1.0 / ( sizeLod - 1 );
                const min = - texelSize / 2;
                const max = 1 + texelSize / 2;
                const uv1 = [ min, min, max, min, max, max, min, min, max, max, min, max ];

                const cubeFaces = 6;
                const vertices = 6;
                const positionSize = 3;
                const uvSize = 2;
                const faceIndexSize = 1;

                const position = new Float32Array( positionSize * vertices * cubeFaces );
                const uv = new Float32Array( uvSize * vertices * cubeFaces );
                const faceIndex = new Float32Array( faceIndexSize * vertices * cubeFaces );

                for ( let face = 0; face < cubeFaces; face ++ ) {

                        const x = ( face % 3 ) * 2 / 3 - 1;
                        const y = face > 2 ? 0 : - 1;
                        const coordinates = [
                                x, y, 0,
                                x + 2 / 3, y, 0,
                                x + 2 / 3, y + 1, 0,
                                x, y, 0,
                                x + 2 / 3, y + 1, 0,
                                x, y + 1, 0
                        ];
                        position.set( coordinates, positionSize * vertices * face );
                        uv.set( uv1, uvSize * vertices * face );
                        const fill = [ face, face, face, face, face, face ];
                        faceIndex.set( fill, faceIndexSize * vertices * face );

                }

                const planes = new BufferGeometry();
                planes.setAttribute( 'position', new BufferAttribute( position, positionSize ) );
                planes.setAttribute( 'uv', new BufferAttribute( uv, uvSize ) );
                planes.setAttribute( 'faceIndex', new BufferAttribute( faceIndex, faceIndexSize ) );
                _lodPlanes.push( planes );

                if ( lod > LOD_MIN ) {

                        lod --;

                }

        }

        return { _lodPlanes, _sizeLods, _sigmas };

}

function _createRenderTarget( params ) {

        const cubeUVRenderTarget = new WebGLRenderTarget( 3 * SIZE_MAX, 3 * SIZE_MAX, params );
        cubeUVRenderTarget.texture.mapping = CubeUVReflectionMapping;
        cubeUVRenderTarget.texture.name = 'PMREM.cubeUv';
        cubeUVRenderTarget.scissorTest = true;
        return cubeUVRenderTarget;

}

function _setViewport( target, x, y, width, height ) {

        target.viewport.set( x, y, width, height );
        target.scissor.set( x, y, width, height );

}

function _getBlurShader( maxSamples ) {

        const weights = new Float32Array( maxSamples );
        const poleAxis = new Vector3( 0, 1, 0 );
        const shaderMaterial = new RawShaderMaterial( {

                name: 'SphericalGaussianBlur',

                defines: { 'n': maxSamples },

                uniforms: {
                        'envMap': { value: null },
                        'samples': { value: 1 },
                        'weights': { value: weights },
                        'latitudinal': { value: false },
                        'dTheta': { value: 0 },
                        'mipInt': { value: 0 },
                        'poleAxis': { value: poleAxis },
                        'inputEncoding': { value: ENCODINGS[ LinearEncoding ] },
                        'outputEncoding': { value: ENCODINGS[ LinearEncoding ] }
                },

                vertexShader: _getCommonVertexShader(),

                fragmentShader: /* glsl */`

                        precision mediump float;
                        precision mediump int;

                        varying vec3 vOutputDirection;

                        uniform sampler2D envMap;
                        uniform int samples;
                        uniform float weights[ n ];
                        uniform bool latitudinal;
                        uniform float dTheta;
                        uniform float mipInt;
                        uniform vec3 poleAxis;

                        ${ _getEncodings() }

                        #define ENVMAP_TYPE_CUBE_UV
                        #include <cube_uv_reflection_fragment>

                        vec3 getSample( float theta, vec3 axis ) {

                                float cosTheta = cos( theta );
                                // Rodrigues' axis-angle rotation
                                vec3 sampleDirection = vOutputDirection * cosTheta
                                        + cross( axis, vOutputDirection ) * sin( theta )
                                        + axis * dot( axis, vOutputDirection ) * ( 1.0 - cosTheta );

                                return bilinearCubeUV( envMap, sampleDirection, mipInt );

                        }

                        void main() {

                                vec3 axis = latitudinal ? poleAxis : cross( poleAxis, vOutputDirection );

                                if ( all( equal( axis, vec3( 0.0 ) ) ) ) {

                                        axis = vec3( vOutputDirection.z, 0.0, - vOutputDirection.x );

                                }

                                axis = normalize( axis );

                                gl_FragColor = vec4( 0.0, 0.0, 0.0, 1.0 );
                                gl_FragColor.rgb += weights[ 0 ] * getSample( 0.0, axis );

                                for ( int i = 1; i < n; i++ ) {

                                        if ( i >= samples ) {

                                                break;

                                        }

                                        float theta = dTheta * float( i );
                                        gl_FragColor.rgb += weights[ i ] * getSample( -1.0 * theta, axis );
                                        gl_FragColor.rgb += weights[ i ] * getSample( theta, axis );

                                }

                                gl_FragColor = linearToOutputTexel( gl_FragColor );

                        }
                `,

                blending: NoBlending,
                depthTest: false,
                depthWrite: false

        } );

        return shaderMaterial;

}

function _getEquirectShader() {

        const texelSize = new Vector2( 1, 1 );
        const shaderMaterial = new RawShaderMaterial( {

                name: 'EquirectangularToCubeUV',

                uniforms: {
                        'envMap': { value: null },
                        'texelSize': { value: texelSize },
                        'inputEncoding': { value: ENCODINGS[ LinearEncoding ] },
                        'outputEncoding': { value: ENCODINGS[ LinearEncoding ] }
                },

                vertexShader: _getCommonVertexShader(),

                fragmentShader: /* glsl */`

                        precision mediump float;
                        precision mediump int;

                        varying vec3 vOutputDirection;

                        uniform sampler2D envMap;
                        uniform vec2 texelSize;

                        ${ _getEncodings() }

                        #include <common>

                        void main() {

                                gl_FragColor = vec4( 0.0, 0.0, 0.0, 1.0 );

                                vec3 outputDirection = normalize( vOutputDirection );
                                vec2 uv = equirectUv( outputDirection );

                                vec2 f = fract( uv / texelSize - 0.5 );
                                uv -= f * texelSize;
                                vec3 tl = envMapTexelToLinear( texture2D ( envMap, uv ) ).rgb;
                                uv.x += texelSize.x;
                                vec3 tr = envMapTexelToLinear( texture2D ( envMap, uv ) ).rgb;
                                uv.y += texelSize.y;
                                vec3 br = envMapTexelToLinear( texture2D ( envMap, uv ) ).rgb;
                                uv.x -= texelSize.x;
                                vec3 bl = envMapTexelToLinear( texture2D ( envMap, uv ) ).rgb;

                                vec3 tm = mix( tl, tr, f.x );
                                vec3 bm = mix( bl, br, f.x );
                                gl_FragColor.rgb = mix( tm, bm, f.y );

                                gl_FragColor = linearToOutputTexel( gl_FragColor );

                        }
                `,

                blending: NoBlending,
                depthTest: false,
                depthWrite: false

        } );

        return shaderMaterial;

}

function _getCubemapShader() {

        const shaderMaterial = new RawShaderMaterial( {

                name: 'CubemapToCubeUV',

                uniforms: {
                        'envMap': { value: null },
                        'inputEncoding': { value: ENCODINGS[ LinearEncoding ] },
                        'outputEncoding': { value: ENCODINGS[ LinearEncoding ] }
                },

                vertexShader: _getCommonVertexShader(),

                fragmentShader: /* glsl */`

                        precision mediump float;
                        precision mediump int;

                        varying vec3 vOutputDirection;

                        uniform samplerCube envMap;

                        ${ _getEncodings() }

                        void main() {

                                gl_FragColor = vec4( 0.0, 0.0, 0.0, 1.0 );
                                gl_FragColor.rgb = envMapTexelToLinear( textureCube( envMap, vec3( - vOutputDirection.x, vOutputDirection.yz ) ) ).rgb;
                                gl_FragColor = linearToOutputTexel( gl_FragColor );

                        }
                `,

                blending: NoBlending,
                depthTest: false,
                depthWrite: false

        } );

        return shaderMaterial;

}

function _getCommonVertexShader() {

        return /* glsl */`

                precision mediump float;
                precision mediump int;

                attribute vec3 position;
                attribute vec2 uv;
                attribute float faceIndex;

                varying vec3 vOutputDirection;

                // RH coordinate system; PMREM face-indexing convention
                vec3 getDirection( vec2 uv, float face ) {

                        uv = 2.0 * uv - 1.0;

                        vec3 direction = vec3( uv, 1.0 );

                        if ( face == 0.0 ) {

                                direction = direction.zyx; // ( 1, v, u ) pos x

                        } else if ( face == 1.0 ) {

                                direction = direction.xzy;
                                direction.xz *= -1.0; // ( -u, 1, -v ) pos y

                        } else if ( face == 2.0 ) {

                                direction.x *= -1.0; // ( -u, v, 1 ) pos z

                        } else if ( face == 3.0 ) {

                                direction = direction.zyx;
                                direction.xz *= -1.0; // ( -1, v, -u ) neg x

                        } else if ( face == 4.0 ) {

                                direction = direction.xzy;
                                direction.xy *= -1.0; // ( -u, -1, v ) neg y

                        } else if ( face == 5.0 ) {

                                direction.z *= -1.0; // ( u, v, -1 ) neg z

                        }

                        return direction;

                }

                void main() {

                        vOutputDirection = getDirection( uv, faceIndex );
                        gl_Position = vec4( position, 1.0 );

                }
        `;

}

function _getEncodings() {

        return /* glsl */`

                uniform int inputEncoding;
                uniform int outputEncoding;

                #include <encodings_pars_fragment>

                vec4 inputTexelToLinear( vec4 value ) {

                        if ( inputEncoding == 0 ) {

                                return value;

                        } else if ( inputEncoding == 1 ) {

                                return sRGBToLinear( value );

                        } else if ( inputEncoding == 2 ) {

                                return RGBEToLinear( value );

                        } else if ( inputEncoding == 3 ) {

                                return RGBMToLinear( value, 7.0 );

                        } else if ( inputEncoding == 4 ) {

                                return RGBMToLinear( value, 16.0 );

                        } else if ( inputEncoding == 5 ) {

                                return RGBDToLinear( value, 256.0 );

                        } else {

                                return GammaToLinear( value, 2.2 );

                        }

                }

                vec4 linearToOutputTexel( vec4 value ) {

                        if ( outputEncoding == 0 ) {

                                return value;

                        } else if ( outputEncoding == 1 ) {

                                return LinearTosRGB( value );

                        } else if ( outputEncoding == 2 ) {

                                return LinearToRGBE( value );

                        } else if ( outputEncoding == 3 ) {

                                return LinearToRGBM( value, 7.0 );

                        } else if ( outputEncoding == 4 ) {

                                return LinearToRGBM( value, 16.0 );

                        } else if ( outputEncoding == 5 ) {

                                return LinearToRGBD( value, 256.0 );

                        } else {

                                return LinearToGamma( value, 2.2 );

                        }

                }

                vec4 envMapTexelToLinear( vec4 color ) {

                        return inputTexelToLinear( color );

                }
        `;

}

function Face4( a, b, c, d, normal, color, materialIndex ) {

        console.warn( 'THREE.Face4 has been removed. A THREE.Face3 will be created instead.' );
        return new Face3( a, b, c, normal, color, materialIndex );

}

const LineStrip = 0;
const LinePieces = 1;
const NoColors = 0;
const FaceColors = 1;
const VertexColors = 2;

function MeshFaceMaterial( materials ) {

        console.warn( 'THREE.MeshFaceMaterial has been removed. Use an Array instead.' );
        return materials;

}

function MultiMaterial( materials = [] ) {

        console.warn( 'THREE.MultiMaterial has been removed. Use an Array instead.' );
        materials.isMultiMaterial = true;
        materials.materials = materials;
        materials.clone = function () {

                return materials.slice();

        };

        return materials;

}

function PointCloud( geometry, material ) {

        console.warn( 'THREE.PointCloud has been renamed to THREE.Points.' );
        return new Points( geometry, material );

}

function Particle( material ) {

        console.warn( 'THREE.Particle has been renamed to THREE.Sprite.' );
        return new Sprite( material );

}

function ParticleSystem( geometry, material ) {

        console.warn( 'THREE.ParticleSystem has been renamed to THREE.Points.' );
        return new Points( geometry, material );

}

function PointCloudMaterial( parameters ) {

        console.warn( 'THREE.PointCloudMaterial has been renamed to THREE.PointsMaterial.' );
        return new PointsMaterial( parameters );

}

function ParticleBasicMaterial( parameters ) {

        console.warn( 'THREE.ParticleBasicMaterial has been renamed to THREE.PointsMaterial.' );
        return new PointsMaterial( parameters );

}

function ParticleSystemMaterial( parameters ) {

        console.warn( 'THREE.ParticleSystemMaterial has been renamed to THREE.PointsMaterial.' );
        return new PointsMaterial( parameters );

}

function Vertex( x, y, z ) {

        console.warn( 'THREE.Vertex has been removed. Use THREE.Vector3 instead.' );
        return new Vector3( x, y, z );

}

//

function DynamicBufferAttribute( array, itemSize ) {

        console.warn( 'THREE.DynamicBufferAttribute has been removed. Use new THREE.BufferAttribute().setUsage( THREE.DynamicDrawUsage ) instead.' );
        return new BufferAttribute( array, itemSize ).setUsage( DynamicDrawUsage );

}

function Int8Attribute( array, itemSize ) {

        console.warn( 'THREE.Int8Attribute has been removed. Use new THREE.Int8BufferAttribute() instead.' );
        return new Int8BufferAttribute( array, itemSize );

}

function Uint8Attribute( array, itemSize ) {

        console.warn( 'THREE.Uint8Attribute has been removed. Use new THREE.Uint8BufferAttribute() instead.' );
        return new Uint8BufferAttribute( array, itemSize );

}

function Uint8ClampedAttribute( array, itemSize ) {

        console.warn( 'THREE.Uint8ClampedAttribute has been removed. Use new THREE.Uint8ClampedBufferAttribute() instead.' );
        return new Uint8ClampedBufferAttribute( array, itemSize );

}

function Int16Attribute( array, itemSize ) {

        console.warn( 'THREE.Int16Attribute has been removed. Use new THREE.Int16BufferAttribute() instead.' );
        return new Int16BufferAttribute( array, itemSize );

}

function Uint16Attribute( array, itemSize ) {

        console.warn( 'THREE.Uint16Attribute has been removed. Use new THREE.Uint16BufferAttribute() instead.' );
        return new Uint16BufferAttribute( array, itemSize );

}

function Int32Attribute( array, itemSize ) {

        console.warn( 'THREE.Int32Attribute has been removed. Use new THREE.Int32BufferAttribute() instead.' );
        return new Int32BufferAttribute( array, itemSize );

}

function Uint32Attribute( array, itemSize ) {

        console.warn( 'THREE.Uint32Attribute has been removed. Use new THREE.Uint32BufferAttribute() instead.' );
        return new Uint32BufferAttribute( array, itemSize );

}

function Float32Attribute( array, itemSize ) {

        console.warn( 'THREE.Float32Attribute has been removed. Use new THREE.Float32BufferAttribute() instead.' );
        return new Float32BufferAttribute( array, itemSize );

}

function Float64Attribute( array, itemSize ) {

        console.warn( 'THREE.Float64Attribute has been removed. Use new THREE.Float64BufferAttribute() instead.' );
        return new Float64BufferAttribute( array, itemSize );

}

//

Curve.create = function ( construct, getPoint ) {

        console.log( 'THREE.Curve.create() has been deprecated' );

        construct.prototype = Object.create( Curve.prototype );
        construct.prototype.constructor = construct;
        construct.prototype.getPoint = getPoint;

        return construct;

};

//

Object.assign( CurvePath.prototype, {

        createPointsGeometry: function ( divisions ) {

                console.warn( 'THREE.CurvePath: .createPointsGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.' );

                // generate geometry from path points (for Line or Points objects)

                const pts = this.getPoints( divisions );
                return this.createGeometry( pts );

        },

        createSpacedPointsGeometry: function ( divisions ) {

                console.warn( 'THREE.CurvePath: .createSpacedPointsGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.' );

                // generate geometry from equidistant sampling along the path

                const pts = this.getSpacedPoints( divisions );
                return this.createGeometry( pts );

        },

        createGeometry: function ( points ) {

                console.warn( 'THREE.CurvePath: .createGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.' );

                const geometry = new Geometry();

                for ( let i = 0, l = points.length; i < l; i ++ ) {

                        const point = points[ i ];
                        geometry.vertices.push( new Vector3( point.x, point.y, point.z || 0 ) );

                }

                return geometry;

        }

} );

//

Object.assign( Path.prototype, {

        fromPoints: function ( points ) {

                console.warn( 'THREE.Path: .fromPoints() has been renamed to .setFromPoints().' );
                return this.setFromPoints( points );

        }

} );

//

function ClosedSplineCurve3( points ) {

        console.warn( 'THREE.ClosedSplineCurve3 has been deprecated. Use THREE.CatmullRomCurve3 instead.' );

        CatmullRomCurve3.call( this, points );
        this.type = 'catmullrom';
        this.closed = true;

}

ClosedSplineCurve3.prototype = Object.create( CatmullRomCurve3.prototype );

//

function SplineCurve3( points ) {

        console.warn( 'THREE.SplineCurve3 has been deprecated. Use THREE.CatmullRomCurve3 instead.' );

        CatmullRomCurve3.call( this, points );
        this.type = 'catmullrom';

}

SplineCurve3.prototype = Object.create( CatmullRomCurve3.prototype );

//

function Spline( points ) {

        console.warn( 'THREE.Spline has been removed. Use THREE.CatmullRomCurve3 instead.' );

        CatmullRomCurve3.call( this, points );
        this.type = 'catmullrom';

}

Spline.prototype = Object.create( CatmullRomCurve3.prototype );

Object.assign( Spline.prototype, {

        initFromArray: function ( /* a */ ) {

                console.error( 'THREE.Spline: .initFromArray() has been removed.' );

        },
        getControlPointsArray: function ( /* optionalTarget */ ) {

                console.error( 'THREE.Spline: .getControlPointsArray() has been removed.' );

        },
        reparametrizeByArcLength: function ( /* samplingCoef */ ) {

                console.error( 'THREE.Spline: .reparametrizeByArcLength() has been removed.' );

        }

} );

//

function AxisHelper( size ) {

        console.warn( 'THREE.AxisHelper has been renamed to THREE.AxesHelper.' );
        return new AxesHelper( size );

}

function BoundingBoxHelper( object, color ) {

        console.warn( 'THREE.BoundingBoxHelper has been deprecated. Creating a THREE.BoxHelper instead.' );
        return new BoxHelper( object, color );

}

function EdgesHelper( object, hex ) {

        console.warn( 'THREE.EdgesHelper has been removed. Use THREE.EdgesGeometry instead.' );
        return new LineSegments( new EdgesGeometry( object.geometry ), new LineBasicMaterial( { color: hex !== undefined ? hex : 0xffffff } ) );

}

GridHelper.prototype.setColors = function () {

        console.error( 'THREE.GridHelper: setColors() has been deprecated, pass them in the constructor instead.' );

};

SkeletonHelper.prototype.update = function () {

        console.error( 'THREE.SkeletonHelper: update() no longer needs to be called.' );

};

function WireframeHelper( object, hex ) {

        console.warn( 'THREE.WireframeHelper has been removed. Use THREE.WireframeGeometry instead.' );
        return new LineSegments( new WireframeGeometry( object.geometry ), new LineBasicMaterial( { color: hex !== undefined ? hex : 0xffffff } ) );

}

//

Object.assign( Loader.prototype, {

        extractUrlBase: function ( url ) {

                console.warn( 'THREE.Loader: .extractUrlBase() has been deprecated. Use THREE.LoaderUtils.extractUrlBase() instead.' );
                return LoaderUtils.extractUrlBase( url );

        }

} );

Loader.Handlers = {

        add: function ( /* regex, loader */ ) {

                console.error( 'THREE.Loader: Handlers.add() has been removed. Use LoadingManager.addHandler() instead.' );

        },

        get: function ( /* file */ ) {

                console.error( 'THREE.Loader: Handlers.get() has been removed. Use LoadingManager.getHandler() instead.' );

        }

};

function XHRLoader( manager ) {

        console.warn( 'THREE.XHRLoader has been renamed to THREE.FileLoader.' );
        return new FileLoader( manager );

}

function BinaryTextureLoader( manager ) {

        console.warn( 'THREE.BinaryTextureLoader has been renamed to THREE.DataTextureLoader.' );
        return new DataTextureLoader( manager );

}

//

Object.assign( Box2.prototype, {

        center: function ( optionalTarget ) {

                console.warn( 'THREE.Box2: .center() has been renamed to .getCenter().' );
                return this.getCenter( optionalTarget );

        },
        empty: function () {

                console.warn( 'THREE.Box2: .empty() has been renamed to .isEmpty().' );
                return this.isEmpty();

        },
        isIntersectionBox: function ( box ) {

                console.warn( 'THREE.Box2: .isIntersectionBox() has been renamed to .intersectsBox().' );
                return this.intersectsBox( box );

        },
        size: function ( optionalTarget ) {

                console.warn( 'THREE.Box2: .size() has been renamed to .getSize().' );
                return this.getSize( optionalTarget );

        }
} );

Object.assign( Box3.prototype, {

        center: function ( optionalTarget ) {

                console.warn( 'THREE.Box3: .center() has been renamed to .getCenter().' );
                return this.getCenter( optionalTarget );

        },
        empty: function () {

                console.warn( 'THREE.Box3: .empty() has been renamed to .isEmpty().' );
                return this.isEmpty();

        },
        isIntersectionBox: function ( box ) {

                console.warn( 'THREE.Box3: .isIntersectionBox() has been renamed to .intersectsBox().' );
                return this.intersectsBox( box );

        },
        isIntersectionSphere: function ( sphere ) {

                console.warn( 'THREE.Box3: .isIntersectionSphere() has been renamed to .intersectsSphere().' );
                return this.intersectsSphere( sphere );

        },
        size: function ( optionalTarget ) {

                console.warn( 'THREE.Box3: .size() has been renamed to .getSize().' );
                return this.getSize( optionalTarget );

        }
} );

Object.assign( Sphere.prototype, {

        empty: function () {

                console.warn( 'THREE.Sphere: .empty() has been renamed to .isEmpty().' );
                return this.isEmpty();

        },

} );

Frustum.prototype.setFromMatrix = function ( m ) {

        console.warn( 'THREE.Frustum: .setFromMatrix() has been renamed to .setFromProjectionMatrix().' );
        return this.setFromProjectionMatrix( m );

};

Line3.prototype.center = function ( optionalTarget ) {

        console.warn( 'THREE.Line3: .center() has been renamed to .getCenter().' );
        return this.getCenter( optionalTarget );

};

Object.assign( MathUtils, {

        random16: function () {

                console.warn( 'THREE.Math: .random16() has been deprecated. Use Math.random() instead.' );
                return Math.random();

        },

        nearestPowerOfTwo: function ( value ) {

                console.warn( 'THREE.Math: .nearestPowerOfTwo() has been renamed to .floorPowerOfTwo().' );
                return MathUtils.floorPowerOfTwo( value );

        },

        nextPowerOfTwo: function ( value ) {

                console.warn( 'THREE.Math: .nextPowerOfTwo() has been renamed to .ceilPowerOfTwo().' );
                return MathUtils.ceilPowerOfTwo( value );

        }

} );

Object.assign( Matrix3.prototype, {

        flattenToArrayOffset: function ( array, offset ) {

                console.warn( "THREE.Matrix3: .flattenToArrayOffset() has been deprecated. Use .toArray() instead." );
                return this.toArray( array, offset );

        },
        multiplyVector3: function ( vector ) {

                console.warn( 'THREE.Matrix3: .multiplyVector3() has been removed. Use vector.applyMatrix3( matrix ) instead.' );
                return vector.applyMatrix3( this );

        },
        multiplyVector3Array: function ( /* a */ ) {

                console.error( 'THREE.Matrix3: .multiplyVector3Array() has been removed.' );

        },
        applyToBufferAttribute: function ( attribute ) {

                console.warn( 'THREE.Matrix3: .applyToBufferAttribute() has been removed. Use attribute.applyMatrix3( matrix ) instead.' );
                return attribute.applyMatrix3( this );

        },
        applyToVector3Array: function ( /* array, offset, length */ ) {

                console.error( 'THREE.Matrix3: .applyToVector3Array() has been removed.' );

        },
        getInverse: function ( matrix ) {

                console.warn( 'THREE.Matrix3: .getInverse() has been removed. Use matrixInv.copy( matrix ).invert(); instead.' );
                return this.copy( matrix ).invert();

        }

} );

Object.assign( Matrix4.prototype, {

        extractPosition: function ( m ) {

                console.warn( 'THREE.Matrix4: .extractPosition() has been renamed to .copyPosition().' );
                return this.copyPosition( m );

        },
        flattenToArrayOffset: function ( array, offset ) {

                console.warn( "THREE.Matrix4: .flattenToArrayOffset() has been deprecated. Use .toArray() instead." );
                return this.toArray( array, offset );

        },
        getPosition: function () {

                console.warn( 'THREE.Matrix4: .getPosition() has been removed. Use Vector3.setFromMatrixPosition( matrix ) instead.' );
                return new Vector3().setFromMatrixColumn( this, 3 );

        },
        setRotationFromQuaternion: function ( q ) {

                console.warn( 'THREE.Matrix4: .setRotationFromQuaternion() has been renamed to .makeRotationFromQuaternion().' );
                return this.makeRotationFromQuaternion( q );

        },
        multiplyToArray: function () {

                console.warn( 'THREE.Matrix4: .multiplyToArray() has been removed.' );

        },
        multiplyVector3: function ( vector ) {

                console.warn( 'THREE.Matrix4: .multiplyVector3() has been removed. Use vector.applyMatrix4( matrix ) instead.' );
                return vector.applyMatrix4( this );

        },
        multiplyVector4: function ( vector ) {

                console.warn( 'THREE.Matrix4: .multiplyVector4() has been removed. Use vector.applyMatrix4( matrix ) instead.' );
                return vector.applyMatrix4( this );

        },
        multiplyVector3Array: function ( /* a */ ) {

                console.error( 'THREE.Matrix4: .multiplyVector3Array() has been removed.' );

        },
        rotateAxis: function ( v ) {

                console.warn( 'THREE.Matrix4: .rotateAxis() has been removed. Use Vector3.transformDirection( matrix ) instead.' );
                v.transformDirection( this );

        },
        crossVector: function ( vector ) {

                console.warn( 'THREE.Matrix4: .crossVector() has been removed. Use vector.applyMatrix4( matrix ) instead.' );
                return vector.applyMatrix4( this );

        },
        translate: function () {

                console.error( 'THREE.Matrix4: .translate() has been removed.' );

        },
        rotateX: function () {

                console.error( 'THREE.Matrix4: .rotateX() has been removed.' );

        },
        rotateY: function () {

                console.error( 'THREE.Matrix4: .rotateY() has been removed.' );

        },
        rotateZ: function () {

                console.error( 'THREE.Matrix4: .rotateZ() has been removed.' );

        },
        rotateByAxis: function () {

                console.error( 'THREE.Matrix4: .rotateByAxis() has been removed.' );

        },
        applyToBufferAttribute: function ( attribute ) {

                console.warn( 'THREE.Matrix4: .applyToBufferAttribute() has been removed. Use attribute.applyMatrix4( matrix ) instead.' );
                return attribute.applyMatrix4( this );

        },
        applyToVector3Array: function ( /* array, offset, length */ ) {

                console.error( 'THREE.Matrix4: .applyToVector3Array() has been removed.' );

        },
        makeFrustum: function ( left, right, bottom, top, near, far ) {

                console.warn( 'THREE.Matrix4: .makeFrustum() has been removed. Use .makePerspective( left, right, top, bottom, near, far ) instead.' );
                return this.makePerspective( left, right, top, bottom, near, far );

        },
        getInverse: function ( matrix ) {

                console.warn( 'THREE.Matrix4: .getInverse() has been removed. Use matrixInv.copy( matrix ).invert(); instead.' );
                return this.copy( matrix ).invert();

        }

} );

Plane.prototype.isIntersectionLine = function ( line ) {

        console.warn( 'THREE.Plane: .isIntersectionLine() has been renamed to .intersectsLine().' );
        return this.intersectsLine( line );

};

Object.assign( Quaternion.prototype, {

        multiplyVector3: function ( vector ) {

                console.warn( 'THREE.Quaternion: .multiplyVector3() has been removed. Use is now vector.applyQuaternion( quaternion ) instead.' );
                return vector.applyQuaternion( this );

        },
        inverse: function ( ) {

                console.warn( 'THREE.Quaternion: .inverse() has been renamed to invert().' );
                return this.invert();

        }

} );

Object.assign( Ray.prototype, {

        isIntersectionBox: function ( box ) {

                console.warn( 'THREE.Ray: .isIntersectionBox() has been renamed to .intersectsBox().' );
                return this.intersectsBox( box );

        },
        isIntersectionPlane: function ( plane ) {

                console.warn( 'THREE.Ray: .isIntersectionPlane() has been renamed to .intersectsPlane().' );
                return this.intersectsPlane( plane );

        },
        isIntersectionSphere: function ( sphere ) {

                console.warn( 'THREE.Ray: .isIntersectionSphere() has been renamed to .intersectsSphere().' );
                return this.intersectsSphere( sphere );

        }

} );

Object.assign( Triangle.prototype, {

        area: function () {

                console.warn( 'THREE.Triangle: .area() has been renamed to .getArea().' );
                return this.getArea();

        },
        barycoordFromPoint: function ( point, target ) {

                console.warn( 'THREE.Triangle: .barycoordFromPoint() has been renamed to .getBarycoord().' );
                return this.getBarycoord( point, target );

        },
        midpoint: function ( target ) {

                console.warn( 'THREE.Triangle: .midpoint() has been renamed to .getMidpoint().' );
                return this.getMidpoint( target );

        },
        normal: function ( target ) {

                console.warn( 'THREE.Triangle: .normal() has been renamed to .getNormal().' );
                return this.getNormal( target );

        },
        plane: function ( target ) {

                console.warn( 'THREE.Triangle: .plane() has been renamed to .getPlane().' );
                return this.getPlane( target );

        }

} );

Object.assign( Triangle, {

        barycoordFromPoint: function ( point, a, b, c, target ) {

                console.warn( 'THREE.Triangle: .barycoordFromPoint() has been renamed to .getBarycoord().' );
                return Triangle.getBarycoord( point, a, b, c, target );

        },
        normal: function ( a, b, c, target ) {

                console.warn( 'THREE.Triangle: .normal() has been renamed to .getNormal().' );
                return Triangle.getNormal( a, b, c, target );

        }

} );

Object.assign( Shape.prototype, {

        extractAllPoints: function ( divisions ) {

                console.warn( 'THREE.Shape: .extractAllPoints() has been removed. Use .extractPoints() instead.' );
                return this.extractPoints( divisions );

        },
        extrude: function ( options ) {

                console.warn( 'THREE.Shape: .extrude() has been removed. Use ExtrudeGeometry() instead.' );
                return new ExtrudeGeometry( this, options );

        },
        makeGeometry: function ( options ) {

                console.warn( 'THREE.Shape: .makeGeometry() has been removed. Use ShapeGeometry() instead.' );
                return new ShapeGeometry( this, options );

        }

} );

Object.assign( Vector2.prototype, {

        fromAttribute: function ( attribute, index, offset ) {

                console.warn( 'THREE.Vector2: .fromAttribute() has been renamed to .fromBufferAttribute().' );
                return this.fromBufferAttribute( attribute, index, offset );

        },
        distanceToManhattan: function ( v ) {

                console.warn( 'THREE.Vector2: .distanceToManhattan() has been renamed to .manhattanDistanceTo().' );
                return this.manhattanDistanceTo( v );

        },
        lengthManhattan: function () {

                console.warn( 'THREE.Vector2: .lengthManhattan() has been renamed to .manhattanLength().' );
                return this.manhattanLength();

        }

} );

Object.assign( Vector3.prototype, {

        setEulerFromRotationMatrix: function () {

                console.error( 'THREE.Vector3: .setEulerFromRotationMatrix() has been removed. Use Euler.setFromRotationMatrix() instead.' );

        },
        setEulerFromQuaternion: function () {

                console.error( 'THREE.Vector3: .setEulerFromQuaternion() has been removed. Use Euler.setFromQuaternion() instead.' );

        },
        getPositionFromMatrix: function ( m ) {

                console.warn( 'THREE.Vector3: .getPositionFromMatrix() has been renamed to .setFromMatrixPosition().' );
                return this.setFromMatrixPosition( m );

        },
        getScaleFromMatrix: function ( m ) {

                console.warn( 'THREE.Vector3: .getScaleFromMatrix() has been renamed to .setFromMatrixScale().' );
                return this.setFromMatrixScale( m );

        },
        getColumnFromMatrix: function ( index, matrix ) {

                console.warn( 'THREE.Vector3: .getColumnFromMatrix() has been renamed to .setFromMatrixColumn().' );
                return this.setFromMatrixColumn( matrix, index );

        },
        applyProjection: function ( m ) {

                console.warn( 'THREE.Vector3: .applyProjection() has been removed. Use .applyMatrix4( m ) instead.' );
                return this.applyMatrix4( m );

        },
        fromAttribute: function ( attribute, index, offset ) {

                console.warn( 'THREE.Vector3: .fromAttribute() has been renamed to .fromBufferAttribute().' );
                return this.fromBufferAttribute( attribute, index, offset );

        },
        distanceToManhattan: function ( v ) {

                console.warn( 'THREE.Vector3: .distanceToManhattan() has been renamed to .manhattanDistanceTo().' );
                return this.manhattanDistanceTo( v );

        },
        lengthManhattan: function () {

                console.warn( 'THREE.Vector3: .lengthManhattan() has been renamed to .manhattanLength().' );
                return this.manhattanLength();

        }

} );

Object.assign( Vector4.prototype, {

        fromAttribute: function ( attribute, index, offset ) {

                console.warn( 'THREE.Vector4: .fromAttribute() has been renamed to .fromBufferAttribute().' );
                return this.fromBufferAttribute( attribute, index, offset );

        },
        lengthManhattan: function () {

                console.warn( 'THREE.Vector4: .lengthManhattan() has been renamed to .manhattanLength().' );
                return this.manhattanLength();

        }

} );

//

Object.assign( Geometry.prototype, {

        computeTangents: function () {

                console.error( 'THREE.Geometry: .computeTangents() has been removed.' );

        },
        computeLineDistances: function () {

                console.error( 'THREE.Geometry: .computeLineDistances() has been removed. Use THREE.Line.computeLineDistances() instead.' );

        },
        applyMatrix: function ( matrix ) {

                console.warn( 'THREE.Geometry: .applyMatrix() has been renamed to .applyMatrix4().' );
                return this.applyMatrix4( matrix );

        }

} );

Object.assign( Object3D.prototype, {

        getChildByName: function ( name ) {

                console.warn( 'THREE.Object3D: .getChildByName() has been renamed to .getObjectByName().' );
                return this.getObjectByName( name );

        },
        renderDepth: function () {

                console.warn( 'THREE.Object3D: .renderDepth has been removed. Use .renderOrder, instead.' );

        },
        translate: function ( distance, axis ) {

                console.warn( 'THREE.Object3D: .translate() has been removed. Use .translateOnAxis( axis, distance ) instead.' );
                return this.translateOnAxis( axis, distance );

        },
        getWorldRotation: function () {

                console.error( 'THREE.Object3D: .getWorldRotation() has been removed. Use THREE.Object3D.getWorldQuaternion( target ) instead.' );

        },
        applyMatrix: function ( matrix ) {

                console.warn( 'THREE.Object3D: .applyMatrix() has been renamed to .applyMatrix4().' );
                return this.applyMatrix4( matrix );

        }

} );

Object.defineProperties( Object3D.prototype, {

        eulerOrder: {
                get: function () {

                        console.warn( 'THREE.Object3D: .eulerOrder is now .rotation.order.' );
                        return this.rotation.order;

                },
                set: function ( value ) {

                        console.warn( 'THREE.Object3D: .eulerOrder is now .rotation.order.' );
                        this.rotation.order = value;

                }
        },
        useQuaternion: {
                get: function () {

                        console.warn( 'THREE.Object3D: .useQuaternion has been removed. The library now uses quaternions by default.' );

                },
                set: function () {

                        console.warn( 'THREE.Object3D: .useQuaternion has been removed. The library now uses quaternions by default.' );

                }
        }

} );

Object.assign( Mesh.prototype, {

        setDrawMode: function () {

                console.error( 'THREE.Mesh: .setDrawMode() has been removed. The renderer now always assumes THREE.TrianglesDrawMode. Transform your geometry via BufferGeometryUtils.toTrianglesDrawMode() if necessary.' );

        },

} );

Object.defineProperties( Mesh.prototype, {

        drawMode: {
                get: function () {

                        console.error( 'THREE.Mesh: .drawMode has been removed. The renderer now always assumes THREE.TrianglesDrawMode.' );
                        return TrianglesDrawMode;

                },
                set: function () {

                        console.error( 'THREE.Mesh: .drawMode has been removed. The renderer now always assumes THREE.TrianglesDrawMode. Transform your geometry via BufferGeometryUtils.toTrianglesDrawMode() if necessary.' );

                }
        }

} );

Object.defineProperties( LOD.prototype, {

        objects: {
                get: function () {

                        console.warn( 'THREE.LOD: .objects has been renamed to .levels.' );
                        return this.levels;

                }
        }

} );

Object.defineProperty( Skeleton.prototype, 'useVertexTexture', {

        get: function () {

                console.warn( 'THREE.Skeleton: useVertexTexture has been removed.' );

        },
        set: function () {

                console.warn( 'THREE.Skeleton: useVertexTexture has been removed.' );

        }

} );

SkinnedMesh.prototype.initBones = function () {

        console.error( 'THREE.SkinnedMesh: initBones() has been removed.' );

};

Object.defineProperty( Curve.prototype, '__arcLengthDivisions', {

        get: function () {

                console.warn( 'THREE.Curve: .__arcLengthDivisions is now .arcLengthDivisions.' );
                return this.arcLengthDivisions;

        },
        set: function ( value ) {

                console.warn( 'THREE.Curve: .__arcLengthDivisions is now .arcLengthDivisions.' );
                this.arcLengthDivisions = value;

        }

} );

//

PerspectiveCamera.prototype.setLens = function ( focalLength, filmGauge ) {

        console.warn( "THREE.PerspectiveCamera.setLens is deprecated. " +
                        "Use .setFocalLength and .filmGauge for a photographic setup." );

        if ( filmGauge !== undefined ) this.filmGauge = filmGauge;
        this.setFocalLength( focalLength );

};

//

Object.defineProperties( Light.prototype, {
        onlyShadow: {
                set: function () {

                        console.warn( 'THREE.Light: .onlyShadow has been removed.' );

                }
        },
        shadowCameraFov: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowCameraFov is now .shadow.camera.fov.' );
                        this.shadow.camera.fov = value;

                }
        },
        shadowCameraLeft: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowCameraLeft is now .shadow.camera.left.' );
                        this.shadow.camera.left = value;

                }
        },
        shadowCameraRight: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowCameraRight is now .shadow.camera.right.' );
                        this.shadow.camera.right = value;

                }
        },
        shadowCameraTop: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowCameraTop is now .shadow.camera.top.' );
                        this.shadow.camera.top = value;

                }
        },
        shadowCameraBottom: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowCameraBottom is now .shadow.camera.bottom.' );
                        this.shadow.camera.bottom = value;

                }
        },
        shadowCameraNear: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowCameraNear is now .shadow.camera.near.' );
                        this.shadow.camera.near = value;

                }
        },
        shadowCameraFar: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowCameraFar is now .shadow.camera.far.' );
                        this.shadow.camera.far = value;

                }
        },
        shadowCameraVisible: {
                set: function () {

                        console.warn( 'THREE.Light: .shadowCameraVisible has been removed. Use new THREE.CameraHelper( light.shadow.camera ) instead.' );

                }
        },
        shadowBias: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowBias is now .shadow.bias.' );
                        this.shadow.bias = value;

                }
        },
        shadowDarkness: {
                set: function () {

                        console.warn( 'THREE.Light: .shadowDarkness has been removed.' );

                }
        },
        shadowMapWidth: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowMapWidth is now .shadow.mapSize.width.' );
                        this.shadow.mapSize.width = value;

                }
        },
        shadowMapHeight: {
                set: function ( value ) {

                        console.warn( 'THREE.Light: .shadowMapHeight is now .shadow.mapSize.height.' );
                        this.shadow.mapSize.height = value;

                }
        }
} );

//

Object.defineProperties( BufferAttribute.prototype, {

        length: {
                get: function () {

                        console.warn( 'THREE.BufferAttribute: .length has been deprecated. Use .count instead.' );
                        return this.array.length;

                }
        },
        dynamic: {
                get: function () {

                        console.warn( 'THREE.BufferAttribute: .dynamic has been deprecated. Use .usage instead.' );
                        return this.usage === DynamicDrawUsage;

                },
                set: function ( /* value */ ) {

                        console.warn( 'THREE.BufferAttribute: .dynamic has been deprecated. Use .usage instead.' );
                        this.setUsage( DynamicDrawUsage );

                }
        }

} );

Object.assign( BufferAttribute.prototype, {
        setDynamic: function ( value ) {

                console.warn( 'THREE.BufferAttribute: .setDynamic() has been deprecated. Use .setUsage() instead.' );
                this.setUsage( value === true ? DynamicDrawUsage : StaticDrawUsage );
                return this;

        },
        copyIndicesArray: function ( /* indices */ ) {

                console.error( 'THREE.BufferAttribute: .copyIndicesArray() has been removed.' );

        },
        setArray: function ( /* array */ ) {

                console.error( 'THREE.BufferAttribute: .setArray has been removed. Use BufferGeometry .setAttribute to replace/resize attribute buffers' );

        }
} );

Object.assign( BufferGeometry.prototype, {

        addIndex: function ( index ) {

                console.warn( 'THREE.BufferGeometry: .addIndex() has been renamed to .setIndex().' );
                this.setIndex( index );

        },
        addAttribute: function ( name, attribute ) {

                console.warn( 'THREE.BufferGeometry: .addAttribute() has been renamed to .setAttribute().' );

                if ( ! ( attribute && attribute.isBufferAttribute ) && ! ( attribute && attribute.isInterleavedBufferAttribute ) ) {

                        console.warn( 'THREE.BufferGeometry: .addAttribute() now expects ( name, attribute ).' );

                        return this.setAttribute( name, new BufferAttribute( arguments[ 1 ], arguments[ 2 ] ) );

                }

                if ( name === 'index' ) {

                        console.warn( 'THREE.BufferGeometry.addAttribute: Use .setIndex() for index attribute.' );
                        this.setIndex( attribute );

                        return this;

                }

                return this.setAttribute( name, attribute );

        },
        addDrawCall: function ( start, count, indexOffset ) {

                if ( indexOffset !== undefined ) {

                        console.warn( 'THREE.BufferGeometry: .addDrawCall() no longer supports indexOffset.' );

                }

                console.warn( 'THREE.BufferGeometry: .addDrawCall() is now .addGroup().' );
                this.addGroup( start, count );

        },
        clearDrawCalls: function () {

                console.warn( 'THREE.BufferGeometry: .clearDrawCalls() is now .clearGroups().' );
                this.clearGroups();

        },
        computeTangents: function () {

                console.warn( 'THREE.BufferGeometry: .computeTangents() has been removed.' );

        },
        computeOffsets: function () {

                console.warn( 'THREE.BufferGeometry: .computeOffsets() has been removed.' );

        },
        removeAttribute: function ( name ) {

                console.warn( 'THREE.BufferGeometry: .removeAttribute() has been renamed to .deleteAttribute().' );

                return this.deleteAttribute( name );

        },
        applyMatrix: function ( matrix ) {

                console.warn( 'THREE.BufferGeometry: .applyMatrix() has been renamed to .applyMatrix4().' );
                return this.applyMatrix4( matrix );

        }

} );

Object.defineProperties( BufferGeometry.prototype, {

        drawcalls: {
                get: function () {

                        console.error( 'THREE.BufferGeometry: .drawcalls has been renamed to .groups.' );
                        return this.groups;

                }
        },
        offsets: {
                get: function () {

                        console.warn( 'THREE.BufferGeometry: .offsets has been renamed to .groups.' );
                        return this.groups;

                }
        }

} );

Object.defineProperties( InstancedBufferGeometry.prototype, {

        maxInstancedCount: {
                get: function () {

                        console.warn( 'THREE.InstancedBufferGeometry: .maxInstancedCount has been renamed to .instanceCount.' );
                        return this.instanceCount;

                },
                set: function ( value ) {

                        console.warn( 'THREE.InstancedBufferGeometry: .maxInstancedCount has been renamed to .instanceCount.' );
                        this.instanceCount = value;

                }
        }

} );

Object.defineProperties( Raycaster.prototype, {

        linePrecision: {
                get: function () {

                        console.warn( 'THREE.Raycaster: .linePrecision has been deprecated. Use .params.Line.threshold instead.' );
                        return this.params.Line.threshold;

                },
                set: function ( value ) {

                        console.warn( 'THREE.Raycaster: .linePrecision has been deprecated. Use .params.Line.threshold instead.' );
                        this.params.Line.threshold = value;

                }
        }

} );

Object.defineProperties( InterleavedBuffer.prototype, {

        dynamic: {
                get: function () {

                        console.warn( 'THREE.InterleavedBuffer: .length has been deprecated. Use .usage instead.' );
                        return this.usage === DynamicDrawUsage;

                },
                set: function ( value ) {

                        console.warn( 'THREE.InterleavedBuffer: .length has been deprecated. Use .usage instead.' );
                        this.setUsage( value );

                }
        }

} );

Object.assign( InterleavedBuffer.prototype, {
        setDynamic: function ( value ) {

                console.warn( 'THREE.InterleavedBuffer: .setDynamic() has been deprecated. Use .setUsage() instead.' );
                this.setUsage( value === true ? DynamicDrawUsage : StaticDrawUsage );
                return this;

        },
        setArray: function ( /* array */ ) {

                console.error( 'THREE.InterleavedBuffer: .setArray has been removed. Use BufferGeometry .setAttribute to replace/resize attribute buffers' );

        }
} );

//

Object.assign( ExtrudeBufferGeometry.prototype, {

        getArrays: function () {

                console.error( 'THREE.ExtrudeBufferGeometry: .getArrays() has been removed.' );

        },

        addShapeList: function () {

                console.error( 'THREE.ExtrudeBufferGeometry: .addShapeList() has been removed.' );

        },

        addShape: function () {

                console.error( 'THREE.ExtrudeBufferGeometry: .addShape() has been removed.' );

        }

} );

//

Object.assign( Scene.prototype, {

        dispose: function () {

                console.error( 'THREE.Scene: .dispose() has been removed.' );

        }

} );

//

Object.defineProperties( Uniform.prototype, {

        dynamic: {
                set: function () {

                        console.warn( 'THREE.Uniform: .dynamic has been removed. Use object.onBeforeRender() instead.' );

                }
        },
        onUpdate: {
                value: function () {

                        console.warn( 'THREE.Uniform: .onUpdate() has been removed. Use object.onBeforeRender() instead.' );
                        return this;

                }
        }

} );

//

Object.defineProperties( Material.prototype, {

        wrapAround: {
                get: function () {

                        console.warn( 'THREE.Material: .wrapAround has been removed.' );

                },
                set: function () {

                        console.warn( 'THREE.Material: .wrapAround has been removed.' );

                }
        },

        overdraw: {
                get: function () {

                        console.warn( 'THREE.Material: .overdraw has been removed.' );

                },
                set: function () {

                        console.warn( 'THREE.Material: .overdraw has been removed.' );

                }
        },

        wrapRGB: {
                get: function () {

                        console.warn( 'THREE.Material: .wrapRGB has been removed.' );
                        return new Color();

                }
        },

        shading: {
                get: function () {

                        console.error( 'THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.' );

                },
                set: function ( value ) {

                        console.warn( 'THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.' );
                        this.flatShading = ( value === FlatShading );

                }
        },

        stencilMask: {
                get: function () {

                        console.warn( 'THREE.' + this.type + ': .stencilMask has been removed. Use .stencilFuncMask instead.' );
                        return this.stencilFuncMask;

                },
                set: function ( value ) {

                        console.warn( 'THREE.' + this.type + ': .stencilMask has been removed. Use .stencilFuncMask instead.' );
                        this.stencilFuncMask = value;

                }
        }

} );

Object.defineProperties( MeshPhongMaterial.prototype, {

        metal: {
                get: function () {

                        console.warn( 'THREE.MeshPhongMaterial: .metal has been removed. Use THREE.MeshStandardMaterial instead.' );
                        return false;

                },
                set: function () {

                        console.warn( 'THREE.MeshPhongMaterial: .metal has been removed. Use THREE.MeshStandardMaterial instead' );

                }
        }

} );

Object.defineProperties( MeshPhysicalMaterial.prototype, {

        transparency: {
                get: function () {

                        console.warn( 'THREE.MeshPhysicalMaterial: .transparency has been renamed to .transmission.' );
                        return this.transmission;

                },
                set: function ( value ) {

                        console.warn( 'THREE.MeshPhysicalMaterial: .transparency has been renamed to .transmission.' );
                        this.transmission = value;

                }
        }

} );

Object.defineProperties( ShaderMaterial.prototype, {

        derivatives: {
                get: function () {

                        console.warn( 'THREE.ShaderMaterial: .derivatives has been moved to .extensions.derivatives.' );
                        return this.extensions.derivatives;

                },
                set: function ( value ) {

                        console.warn( 'THREE. ShaderMaterial: .derivatives has been moved to .extensions.derivatives.' );
                        this.extensions.derivatives = value;

                }
        }

} );

//

Object.assign( WebGLRenderer.prototype, {

        clearTarget: function ( renderTarget, color, depth, stencil ) {

                console.warn( 'THREE.WebGLRenderer: .clearTarget() has been deprecated. Use .setRenderTarget() and .clear() instead.' );
                this.setRenderTarget( renderTarget );
                this.clear( color, depth, stencil );

        },
        animate: function ( callback ) {

                console.warn( 'THREE.WebGLRenderer: .animate() is now .setAnimationLoop().' );
                this.setAnimationLoop( callback );

        },
        getCurrentRenderTarget: function () {

                console.warn( 'THREE.WebGLRenderer: .getCurrentRenderTarget() is now .getRenderTarget().' );
                return this.getRenderTarget();

        },
        getMaxAnisotropy: function () {

                console.warn( 'THREE.WebGLRenderer: .getMaxAnisotropy() is now .capabilities.getMaxAnisotropy().' );
                return this.capabilities.getMaxAnisotropy();

        },
        getPrecision: function () {

                console.warn( 'THREE.WebGLRenderer: .getPrecision() is now .capabilities.precision.' );
                return this.capabilities.precision;

        },
        resetGLState: function () {

                console.warn( 'THREE.WebGLRenderer: .resetGLState() is now .state.reset().' );
                return this.state.reset();

        },
        supportsFloatTextures: function () {

                console.warn( 'THREE.WebGLRenderer: .supportsFloatTextures() is now .extensions.get( \'OES_texture_float\' ).' );
                return this.extensions.get( 'OES_texture_float' );

        },
        supportsHalfFloatTextures: function () {

                console.warn( 'THREE.WebGLRenderer: .supportsHalfFloatTextures() is now .extensions.get( \'OES_texture_half_float\' ).' );
                return this.extensions.get( 'OES_texture_half_float' );

        },
        supportsStandardDerivatives: function () {

                console.warn( 'THREE.WebGLRenderer: .supportsStandardDerivatives() is now .extensions.get( \'OES_standard_derivatives\' ).' );
                return this.extensions.get( 'OES_standard_derivatives' );

        },
        supportsCompressedTextureS3TC: function () {

                console.warn( 'THREE.WebGLRenderer: .supportsCompressedTextureS3TC() is now .extensions.get( \'WEBGL_compressed_texture_s3tc\' ).' );
                return this.extensions.get( 'WEBGL_compressed_texture_s3tc' );

        },
        supportsCompressedTexturePVRTC: function () {

                console.warn( 'THREE.WebGLRenderer: .supportsCompressedTexturePVRTC() is now .extensions.get( \'WEBGL_compressed_texture_pvrtc\' ).' );
                return this.extensions.get( 'WEBGL_compressed_texture_pvrtc' );

        },
        supportsBlendMinMax: function () {

                console.warn( 'THREE.WebGLRenderer: .supportsBlendMinMax() is now .extensions.get( \'EXT_blend_minmax\' ).' );
                return this.extensions.get( 'EXT_blend_minmax' );

        },
        supportsVertexTextures: function () {

                console.warn( 'THREE.WebGLRenderer: .supportsVertexTextures() is now .capabilities.vertexTextures.' );
                return this.capabilities.vertexTextures;

        },
        supportsInstancedArrays: function () {

                console.warn( 'THREE.WebGLRenderer: .supportsInstancedArrays() is now .extensions.get( \'ANGLE_instanced_arrays\' ).' );
                return this.extensions.get( 'ANGLE_instanced_arrays' );

        },
        enableScissorTest: function ( boolean ) {

                console.warn( 'THREE.WebGLRenderer: .enableScissorTest() is now .setScissorTest().' );
                this.setScissorTest( boolean );

        },
        initMaterial: function () {

                console.warn( 'THREE.WebGLRenderer: .initMaterial() has been removed.' );

        },
        addPrePlugin: function () {

                console.warn( 'THREE.WebGLRenderer: .addPrePlugin() has been removed.' );

        },
        addPostPlugin: function () {

                console.warn( 'THREE.WebGLRenderer: .addPostPlugin() has been removed.' );

        },
        updateShadowMap: function () {

                console.warn( 'THREE.WebGLRenderer: .updateShadowMap() has been removed.' );

        },
        setFaceCulling: function () {

                console.warn( 'THREE.WebGLRenderer: .setFaceCulling() has been removed.' );

        },
        allocTextureUnit: function () {

                console.warn( 'THREE.WebGLRenderer: .allocTextureUnit() has been removed.' );

        },
        setTexture: function () {

                console.warn( 'THREE.WebGLRenderer: .setTexture() has been removed.' );

        },
        setTexture2D: function () {

                console.warn( 'THREE.WebGLRenderer: .setTexture2D() has been removed.' );

        },
        setTextureCube: function () {

                console.warn( 'THREE.WebGLRenderer: .setTextureCube() has been removed.' );

        },
        getActiveMipMapLevel: function () {

                console.warn( 'THREE.WebGLRenderer: .getActiveMipMapLevel() is now .getActiveMipmapLevel().' );
                return this.getActiveMipmapLevel();

        }

} );

Object.defineProperties( WebGLRenderer.prototype, {

        shadowMapEnabled: {
                get: function () {

                        return this.shadowMap.enabled;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderer: .shadowMapEnabled is now .shadowMap.enabled.' );
                        this.shadowMap.enabled = value;

                }
        },
        shadowMapType: {
                get: function () {

                        return this.shadowMap.type;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderer: .shadowMapType is now .shadowMap.type.' );
                        this.shadowMap.type = value;

                }
        },
        shadowMapCullFace: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .shadowMapCullFace has been removed. Set Material.shadowSide instead.' );
                        return undefined;

                },
                set: function ( /* value */ ) {

                        console.warn( 'THREE.WebGLRenderer: .shadowMapCullFace has been removed. Set Material.shadowSide instead.' );

                }
        },
        context: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .context has been removed. Use .getContext() instead.' );
                        return this.getContext();

                }
        },
        vr: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .vr has been renamed to .xr' );
                        return this.xr;

                }
        },
        gammaInput: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .gammaInput has been removed. Set the encoding for textures via Texture.encoding instead.' );
                        return false;

                },
                set: function () {

                        console.warn( 'THREE.WebGLRenderer: .gammaInput has been removed. Set the encoding for textures via Texture.encoding instead.' );

                }
        },
        gammaOutput: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .gammaOutput has been removed. Set WebGLRenderer.outputEncoding instead.' );
                        return false;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderer: .gammaOutput has been removed. Set WebGLRenderer.outputEncoding instead.' );
                        this.outputEncoding = ( value === true ) ? sRGBEncoding : LinearEncoding;

                }
        },
        toneMappingWhitePoint: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .toneMappingWhitePoint has been removed.' );
                        return 1.0;

                },
                set: function () {

                        console.warn( 'THREE.WebGLRenderer: .toneMappingWhitePoint has been removed.' );

                }
        },

} );

Object.defineProperties( WebGLShadowMap.prototype, {

        cullFace: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .shadowMap.cullFace has been removed. Set Material.shadowSide instead.' );
                        return undefined;

                },
                set: function ( /* cullFace */ ) {

                        console.warn( 'THREE.WebGLRenderer: .shadowMap.cullFace has been removed. Set Material.shadowSide instead.' );

                }
        },
        renderReverseSided: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .shadowMap.renderReverseSided has been removed. Set Material.shadowSide instead.' );
                        return undefined;

                },
                set: function () {

                        console.warn( 'THREE.WebGLRenderer: .shadowMap.renderReverseSided has been removed. Set Material.shadowSide instead.' );

                }
        },
        renderSingleSided: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderer: .shadowMap.renderSingleSided has been removed. Set Material.shadowSide instead.' );
                        return undefined;

                },
                set: function () {

                        console.warn( 'THREE.WebGLRenderer: .shadowMap.renderSingleSided has been removed. Set Material.shadowSide instead.' );

                }
        }

} );

function WebGLRenderTargetCube( width, height, options ) {

        console.warn( 'THREE.WebGLRenderTargetCube( width, height, options ) is now WebGLCubeRenderTarget( size, options ).' );
        return new WebGLCubeRenderTarget( width, options );

}

//

Object.defineProperties( WebGLRenderTarget.prototype, {

        wrapS: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .wrapS is now .texture.wrapS.' );
                        return this.texture.wrapS;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .wrapS is now .texture.wrapS.' );
                        this.texture.wrapS = value;

                }
        },
        wrapT: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .wrapT is now .texture.wrapT.' );
                        return this.texture.wrapT;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .wrapT is now .texture.wrapT.' );
                        this.texture.wrapT = value;

                }
        },
        magFilter: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .magFilter is now .texture.magFilter.' );
                        return this.texture.magFilter;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .magFilter is now .texture.magFilter.' );
                        this.texture.magFilter = value;

                }
        },
        minFilter: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .minFilter is now .texture.minFilter.' );
                        return this.texture.minFilter;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .minFilter is now .texture.minFilter.' );
                        this.texture.minFilter = value;

                }
        },
        anisotropy: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .anisotropy is now .texture.anisotropy.' );
                        return this.texture.anisotropy;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .anisotropy is now .texture.anisotropy.' );
                        this.texture.anisotropy = value;

                }
        },
        offset: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .offset is now .texture.offset.' );
                        return this.texture.offset;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .offset is now .texture.offset.' );
                        this.texture.offset = value;

                }
        },
        repeat: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .repeat is now .texture.repeat.' );
                        return this.texture.repeat;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .repeat is now .texture.repeat.' );
                        this.texture.repeat = value;

                }
        },
        format: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .format is now .texture.format.' );
                        return this.texture.format;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .format is now .texture.format.' );
                        this.texture.format = value;

                }
        },
        type: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .type is now .texture.type.' );
                        return this.texture.type;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .type is now .texture.type.' );
                        this.texture.type = value;

                }
        },
        generateMipmaps: {
                get: function () {

                        console.warn( 'THREE.WebGLRenderTarget: .generateMipmaps is now .texture.generateMipmaps.' );
                        return this.texture.generateMipmaps;

                },
                set: function ( value ) {

                        console.warn( 'THREE.WebGLRenderTarget: .generateMipmaps is now .texture.generateMipmaps.' );
                        this.texture.generateMipmaps = value;

                }
        }

} );

//

Object.defineProperties( Audio.prototype, {

        load: {
                value: function ( file ) {

                        console.warn( 'THREE.Audio: .load has been deprecated. Use THREE.AudioLoader instead.' );
                        const scope = this;
                        const audioLoader = new AudioLoader();
                        audioLoader.load( file, function ( buffer ) {

                                scope.setBuffer( buffer );

                        } );
                        return this;

                }
        },
        startTime: {
                set: function () {

                        console.warn( 'THREE.Audio: .startTime is now .play( delay ).' );

                }
        }

} );

AudioAnalyser.prototype.getData = function () {

        console.warn( 'THREE.AudioAnalyser: .getData() is now .getFrequencyData().' );
        return this.getFrequencyData();

};

//

CubeCamera.prototype.updateCubeMap = function ( renderer, scene ) {

        console.warn( 'THREE.CubeCamera: .updateCubeMap() is now .update().' );
        return this.update( renderer, scene );

};

CubeCamera.prototype.clear = function ( renderer, color, depth, stencil ) {

        console.warn( 'THREE.CubeCamera: .clear() is now .renderTarget.clear().' );
        return this.renderTarget.clear( renderer, color, depth, stencil );

};

//

const GeometryUtils = {

        merge: function ( geometry1, geometry2, materialIndexOffset ) {

                console.warn( 'THREE.GeometryUtils: .merge() has been moved to Geometry. Use geometry.merge( geometry2, matrix, materialIndexOffset ) instead.' );
                let matrix;

                if ( geometry2.isMesh ) {

                        geometry2.matrixAutoUpdate && geometry2.updateMatrix();

                        matrix = geometry2.matrix;
                        geometry2 = geometry2.geometry;

                }

                geometry1.merge( geometry2, matrix, materialIndexOffset );

        },

        center: function ( geometry ) {

                console.warn( 'THREE.GeometryUtils: .center() has been moved to Geometry. Use geometry.center() instead.' );
                return geometry.center();

        }

};

ImageUtils.crossOrigin = undefined;

ImageUtils.loadTexture = function ( url, mapping, onLoad, onError ) {

        console.warn( 'THREE.ImageUtils.loadTexture has been deprecated. Use THREE.TextureLoader() instead.' );

        const loader = new TextureLoader();
        loader.setCrossOrigin( this.crossOrigin );

        const texture = loader.load( url, onLoad, undefined, onError );

        if ( mapping ) texture.mapping = mapping;

        return texture;

};

ImageUtils.loadTextureCube = function ( urls, mapping, onLoad, onError ) {

        console.warn( 'THREE.ImageUtils.loadTextureCube has been deprecated. Use THREE.CubeTextureLoader() instead.' );

        const loader = new CubeTextureLoader();
        loader.setCrossOrigin( this.crossOrigin );

        const texture = loader.load( urls, onLoad, undefined, onError );

        if ( mapping ) texture.mapping = mapping;

        return texture;

};

ImageUtils.loadCompressedTexture = function () {

        console.error( 'THREE.ImageUtils.loadCompressedTexture has been removed. Use THREE.DDSLoader instead.' );

};

ImageUtils.loadCompressedTextureCube = function () {

        console.error( 'THREE.ImageUtils.loadCompressedTextureCube has been removed. Use THREE.DDSLoader instead.' );

};

//

function CanvasRenderer() {

        console.error( 'THREE.CanvasRenderer has been removed' );

}

//

function JSONLoader() {

        console.error( 'THREE.JSONLoader has been removed.' );

}

//

const SceneUtils = {

        createMultiMaterialObject: function ( /* geometry, materials */ ) {

                console.error( 'THREE.SceneUtils has been moved to /examples/jsm/utils/SceneUtils.js' );

        },

        detach: function ( /* child, parent, scene */ ) {

                console.error( 'THREE.SceneUtils has been moved to /examples/jsm/utils/SceneUtils.js' );

        },

        attach: function ( /* child, scene, parent */ ) {

                console.error( 'THREE.SceneUtils has been moved to /examples/jsm/utils/SceneUtils.js' );

        }

};

//

function LensFlare() {

        console.error( 'THREE.LensFlare has been moved to /examples/jsm/objects/Lensflare.js' );

}

if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {

        /* eslint-disable no-undef */
        __THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'register', { detail: {
                revision: REVISION,
        } } ) );
        /* eslint-enable no-undef */

}

export { ACESFilmicToneMapping, AddEquation, AddOperation, AdditiveAnimationBlendMode, AdditiveBlending, AlphaFormat, AlwaysDepth, AlwaysStencilFunc, AmbientLight, AmbientLightProbe, AnimationClip, AnimationLoader, AnimationMixer, AnimationObjectGroup, AnimationUtils, ArcCurve, ArrayCamera, ArrowHelper, Audio, AudioAnalyser, AudioContext, AudioListener, AudioLoader, AxesHelper, AxisHelper, BackSide, BasicDepthPacking, BasicShadowMap, BinaryTextureLoader, Bone, BooleanKeyframeTrack, BoundingBoxHelper, Box2, Box3, Box3Helper, BoxBufferGeometry, BoxGeometry, BoxHelper, BufferAttribute, BufferGeometry, BufferGeometryLoader, ByteType, Cache, Camera, CameraHelper, CanvasRenderer, CanvasTexture, CatmullRomCurve3, CineonToneMapping, CircleBufferGeometry, CircleGeometry, ClampToEdgeWrapping, Clock, ClosedSplineCurve3, Color, ColorKeyframeTrack, CompressedTexture, CompressedTextureLoader, ConeBufferGeometry, ConeGeometry, CubeCamera, BoxGeometry as CubeGeometry, CubeReflectionMapping, CubeRefractionMapping, CubeTexture, CubeTextureLoader, CubeUVReflectionMapping, CubeUVRefractionMapping, CubicBezierCurve, CubicBezierCurve3, CubicInterpolant, CullFaceBack, CullFaceFront, CullFaceFrontBack, CullFaceNone, Curve, CurvePath, CustomBlending, CustomToneMapping, CylinderBufferGeometry, CylinderGeometry, Cylindrical, DataTexture, DataTexture2DArray, DataTexture3D, DataTextureLoader, DataUtils, DecrementStencilOp, DecrementWrapStencilOp, DefaultLoadingManager, DepthFormat, DepthStencilFormat, DepthTexture, DirectionalLight, DirectionalLightHelper, DiscreteInterpolant, DodecahedronBufferGeometry, DodecahedronGeometry, DoubleSide, DstAlphaFactor, DstColorFactor, DynamicBufferAttribute, DynamicCopyUsage, DynamicDrawUsage, DynamicReadUsage, EdgesGeometry, EdgesHelper, EllipseCurve, EqualDepth, EqualStencilFunc, EquirectangularReflectionMapping, EquirectangularRefractionMapping, Euler, EventDispatcher, ExtrudeBufferGeometry, ExtrudeGeometry, Face3, Face4, FaceColors, FileLoader, FlatShading, Float16BufferAttribute, Float32Attribute, Float32BufferAttribute, Float64Attribute, Float64BufferAttribute, FloatType, Fog, FogExp2, Font, FontLoader, FrontSide, Frustum, GLBufferAttribute, GLSL1, GLSL3, GammaEncoding, Geometry, GeometryUtils, GreaterDepth, GreaterEqualDepth, GreaterEqualStencilFunc, GreaterStencilFunc, GridHelper, Group, HalfFloatType, HemisphereLight, HemisphereLightHelper, HemisphereLightProbe, IcosahedronBufferGeometry, IcosahedronGeometry, ImageBitmapLoader, ImageLoader, ImageUtils, ImmediateRenderObject, IncrementStencilOp, IncrementWrapStencilOp, InstancedBufferAttribute, InstancedBufferGeometry, InstancedInterleavedBuffer, InstancedMesh, Int16Attribute, Int16BufferAttribute, Int32Attribute, Int32BufferAttribute, Int8Attribute, Int8BufferAttribute, IntType, InterleavedBuffer, InterleavedBufferAttribute, Interpolant, InterpolateDiscrete, InterpolateLinear, InterpolateSmooth, InvertStencilOp, JSONLoader, KeepStencilOp, KeyframeTrack, LOD, LatheBufferGeometry, LatheGeometry, Layers, LensFlare, LessDepth, LessEqualDepth, LessEqualStencilFunc, LessStencilFunc, Light, LightProbe, Line, Line3, LineBasicMaterial, LineCurve, LineCurve3, LineDashedMaterial, LineLoop, LinePieces, LineSegments, LineStrip, LinearEncoding, LinearFilter, LinearInterpolant, LinearMipMapLinearFilter, LinearMipMapNearestFilter, LinearMipmapLinearFilter, LinearMipmapNearestFilter, LinearToneMapping, Loader, LoaderUtils, LoadingManager, LogLuvEncoding, LoopOnce, LoopPingPong, LoopRepeat, LuminanceAlphaFormat, LuminanceFormat, MOUSE, Material, MaterialLoader, MathUtils as Math, MathUtils, Matrix3, Matrix4, MaxEquation, Mesh, MeshBasicMaterial, MeshDepthMaterial, MeshDistanceMaterial, MeshFaceMaterial, MeshLambertMaterial, MeshMatcapMaterial, MeshNormalMaterial, MeshPhongMaterial, MeshPhysicalMaterial, MeshStandardMaterial, MeshToonMaterial, MinEquation, MirroredRepeatWrapping, MixOperation, MultiMaterial, MultiplyBlending, MultiplyOperation, NearestFilter, NearestMipMapLinearFilter, NearestMipMapNearestFilter, NearestMipmapLinearFilter, NearestMipmapNearestFilter, NeverDepth, NeverStencilFunc, NoBlending, NoColors, NoToneMapping, NormalAnimationBlendMode, NormalBlending, NotEqualDepth, NotEqualStencilFunc, NumberKeyframeTrack, Object3D, ObjectLoader, ObjectSpaceNormalMap, OctahedronBufferGeometry, OctahedronGeometry, OneFactor, OneMinusDstAlphaFactor, OneMinusDstColorFactor, OneMinusSrcAlphaFactor, OneMinusSrcColorFactor, OrthographicCamera, PCFShadowMap, PCFSoftShadowMap, PMREMGenerator, ParametricBufferGeometry, ParametricGeometry, Particle, ParticleBasicMaterial, ParticleSystem, ParticleSystemMaterial, Path, PerspectiveCamera, Plane, PlaneBufferGeometry, PlaneGeometry, PlaneHelper, PointCloud, PointCloudMaterial, PointLight, PointLightHelper, Points, PointsMaterial, PolarGridHelper, PolyhedronBufferGeometry, PolyhedronGeometry, PositionalAudio, PropertyBinding, PropertyMixer, QuadraticBezierCurve, QuadraticBezierCurve3, Quaternion, QuaternionKeyframeTrack, QuaternionLinearInterpolant, REVISION, RGBADepthPacking, RGBAFormat, RGBAIntegerFormat, RGBA_ASTC_10x10_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_BPTC_Format, RGBA_ETC2_EAC_Format, RGBA_PVRTC_2BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGBDEncoding, RGBEEncoding, RGBEFormat, RGBFormat, RGBIntegerFormat, RGBM16Encoding, RGBM7Encoding, RGB_ETC1_Format, RGB_ETC2_Format, RGB_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGB_S3TC_DXT1_Format, RGFormat, RGIntegerFormat, RawShaderMaterial, Ray, Raycaster, RectAreaLight, RedFormat, RedIntegerFormat, ReinhardToneMapping, RepeatWrapping, ReplaceStencilOp, ReverseSubtractEquation, RingBufferGeometry, RingGeometry, SRGB8_ALPHA8_ASTC_10x10_Format, SRGB8_ALPHA8_ASTC_10x5_Format, SRGB8_ALPHA8_ASTC_10x6_Format, SRGB8_ALPHA8_ASTC_10x8_Format, SRGB8_ALPHA8_ASTC_12x10_Format, SRGB8_ALPHA8_ASTC_12x12_Format, SRGB8_ALPHA8_ASTC_4x4_Format, SRGB8_ALPHA8_ASTC_5x4_Format, SRGB8_ALPHA8_ASTC_5x5_Format, SRGB8_ALPHA8_ASTC_6x5_Format, SRGB8_ALPHA8_ASTC_6x6_Format, SRGB8_ALPHA8_ASTC_8x5_Format, SRGB8_ALPHA8_ASTC_8x6_Format, SRGB8_ALPHA8_ASTC_8x8_Format, Scene, SceneUtils, ShaderChunk, ShaderLib, ShaderMaterial, ShadowMaterial, Shape, ShapeBufferGeometry, ShapeGeometry, ShapePath, ShapeUtils, ShortType, Skeleton, SkeletonHelper, SkinnedMesh, SmoothShading, Sphere, SphereBufferGeometry, SphereGeometry, Spherical, SphericalHarmonics3, Spline, SplineCurve, SplineCurve3, SpotLight, SpotLightHelper, Sprite, SpriteMaterial, SrcAlphaFactor, SrcAlphaSaturateFactor, SrcColorFactor, StaticCopyUsage, StaticDrawUsage, StaticReadUsage, StereoCamera, StreamCopyUsage, StreamDrawUsage, StreamReadUsage, StringKeyframeTrack, SubtractEquation, SubtractiveBlending, TOUCH, TangentSpaceNormalMap, TetrahedronBufferGeometry, TetrahedronGeometry, TextBufferGeometry, TextGeometry, Texture, TextureLoader, TorusBufferGeometry, TorusGeometry, TorusKnotBufferGeometry, TorusKnotGeometry, Triangle, TriangleFanDrawMode, TriangleStripDrawMode, TrianglesDrawMode, TubeBufferGeometry, TubeGeometry, UVMapping, Uint16Attribute, Uint16BufferAttribute, Uint32Attribute, Uint32BufferAttribute, Uint8Attribute, Uint8BufferAttribute, Uint8ClampedAttribute, Uint8ClampedBufferAttribute, Uniform, UniformsLib, UniformsUtils, UnsignedByteType, UnsignedInt248Type, UnsignedIntType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedShort565Type, UnsignedShortType, VSMShadowMap, Vector2, Vector3, Vector4, VectorKeyframeTrack, Vertex, VertexColors, VideoTexture, WebGL1Renderer, WebGLCubeRenderTarget, WebGLMultisampleRenderTarget, WebGLRenderTarget, WebGLRenderTargetCube, WebGLRenderer, WebGLUtils, WireframeGeometry, WireframeHelper, WrapAroundEnding, XHRLoader, ZeroCurvatureEnding, ZeroFactor, ZeroSlopeEnding, ZeroStencilOp, sRGBEncoding };