-function init() {\r
- class Point {\r
- constructor(x, y) {\r
- this.x = x;\r
- this.y = y;\r
- }\r
-\r
- add(that) {\r
- return new Point(\r
- this.x + that.x,\r
- this.y + that.y\r
- );\r
- }\r
-\r
- sub(that) {\r
- return new Point(\r
- this.x - that.x,\r
- this.y - that.y\r
- );\r
- }\r
-\r
- dist(that) {\r
- let a = this.x - that.x;\r
- let b = this.y - that.y;\r
- return Math.sqrt(a * a + b * b)\r
- }\r
- }\r
-\r
- class Face {\r
- indices = [];\r
-\r
- constructor(a, b, c, d) {\r
- this.indices.push(a);\r
- this.indices.push(b);\r
- this.indices.push(c);\r
- this.indices.push(d);\r
- }\r
- }\r
\r
- class Cloth {\r
- VertexWeight = 1;\r
\r
- geometry = new THREE.Geometry();\r
+function addLights(scene){\r
+ scene.add(new THREE.AmbientLight(0x222222));\r
\r
- faces = [];\r
+ const light1 = new THREE.PointLight(0xffffff, 1, 50);\r
+ light1.position.set(15, 1, 40);\r
+ scene.add(light1);\r
\r
- vertexWeights = [];\r
+ const light2 = new THREE.PointLight(0xffffff, 1, 50);\r
+ light2.position.set(-15, 0, 40);\r
+ scene.add(light2);\r
\r
- springs = [];\r
-\r
- getSprings(faceIndex) {\r
-\r
- }\r
-\r
- static CreateBasic(width, height, numPointsWidth, numPointsHeight) {\r
- let vertices = [];\r
- let faces = [];\r
-\r
- let stepWidth = width / (numPointsWidth - 1);\r
- let stepHeight = height / (numPointsHeight - 1);\r
-\r
- for (let y = 0; y < numPointsHeight; y++) {\r
- for (let x = 0; x < numPointsWidth; x++) {\r
- vertices.push(\r
- new THREE.Vector3(x * stepWidth, height - y * stepHeight, 0)\r
- );\r
- }\r
- }\r
-\r
- function getVertexIndex(x, y) {\r
- return y * numPointsWidth + x;\r
- }\r
- \r
- for (let y = 0; y < numPointsHeight - 1; y++) {\r
- for (let x = 0; x < numPointsWidth - 1; x++) {\r
- faces.push(\r
- new Face(\r
- getVertexIndex(x, y),\r
- getVertexIndex(x, y + 1),\r
- getVertexIndex(x + 1, y),\r
- getVertexIndex(x + 1, y + 1),\r
- )\r
- );\r
- }\r
- }\r
-\r
- return this.CreateExplicit(vertices, faces);\r
- }\r
-\r
- static CreateExplicit(vertices, faces) {\r
- let result = new Cloth();\r
-\r
- for (let i in vertices) {\r
- result.geometry.vertices.push(vertices[i]);\r
- result.vertexWeights.push(0);\r
- }\r
- for (let i in faces) {\r
- let face = faces[i];\r
-\r
- result.geometry.faces.push(new THREE.Face3(\r
- face.a, face.b, face.c\r
- ));\r
- result.geometry.faces.push(new THREE.Face3(\r
- face.c, face.b, face.d\r
- ));\r
- \r
- let xLength =\r
- result.geometry.vertices[face.b]\r
- .sub(result.geometry.vertices[face.a])\r
- .length();\r
- let yLength =\r
- result.geometry.vertices[face.c]\r
- .sub(result.geometry.vertices[face.a])\r
- .length();\r
- let weight = xLength * yLength / 2;\r
-\r
- xLength =\r
- result.geometry.vertices[face.b]\r
- .sub(result.geometry.vertices[face.d])\r
- .length();\r
- yLength =\r
- result.geometry.vertices[face.c]\r
- .sub(result.geometry.vertices[face.d])\r
- .length();\r
-\r
- weight += xLength * yLength / 2;\r
-\r
- result.vertexWeights[face.a] += weight / 4;\r
- result.vertexWeights[face.b] += weight / 4;\r
- result.vertexWeights[face.c] += weight / 4;\r
- result.vertexWeights[face.d] += weight / 4;\r
- }\r
-\r
- result.geometry.computeBoundingSphere();\r
-\r
- return result;\r
- }\r
- }\r
-\r
- let mousePos = new Point();\r
-\r
- const canvasSpace = 200;\r
+ const light3 = new THREE.PointLight(0xffffff, 1, 50);\r
+ light3.position.set(0, -1, 40);\r
+ scene.add(light3);\r
+}\r
\r
+/**\r
+ * setup THREE JS Scene, Camera and Renderer\r
+ */\r
+function setup_scene(canvasSpace) {\r
const scene = new THREE.Scene();\r
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / (window.innerHeight - canvasSpace), 0.1, 1000);\r
-\r
const renderer = new THREE.WebGLRenderer();\r
+ /** size canvas to leave some space for UI */\r
renderer.setSize(window.innerWidth, window.innerHeight - canvasSpace);\r
+ renderer.antialias = true;\r
+ /** embed canvas in HTML */\r
document.getElementById("threejscontainer").appendChild(renderer.domElement);\r
\r
+ /** add orbit controls */\r
+ const controls = new THREE.OrbitControls(camera, renderer.domElement);\r
+ controls.target.set(0, 0, 0);\r
+ controls.update();\r
+\r
+ /** add scene background */\r
+ const loader = new THREE.TextureLoader();\r
+ const texture = loader.load(\r
+ 'Textures/tears_of_steel_bridge_2k.jpg',\r
+ () => {\r
+ const rt = new THREE.WebGLCubeRenderTarget(texture.image.height);\r
+ rt.fromEquirectangularTexture(renderer, texture);\r
+ scene.background = rt;\r
+ });\r
+\r
+ /** add flag pole */\r
+ const geometry = new THREE.CylinderGeometry(0.02, 0.02, 5, 32);\r
+ const material = new THREE.MeshStandardMaterial({color: 0xffffff});\r
+ const cylinder = new THREE.Mesh(geometry, material);\r
+ cylinder.position.set(-0.5, -2.25, 0);\r
+ scene.add(cylinder);\r
+\r
+ /** add global light */\r
const directionalLight = new THREE.DirectionalLight(0xffffff, 1);\r
scene.add(directionalLight);\r
\r
- let cloth = Cloth.CreateBasic(10, 10, 4, 4);\r
- const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });\r
- const mesh = new THREE.Mesh(cloth.geometry, material);\r
- scene.add(mesh);\r
+ /** position camera */\r
+ camera.position.z = 2;\r
+ addLights(scene);\r
+ return [scene, camera, renderer];\r
+}\r
\r
- camera.position.y = 5;\r
- camera.position.z = 10;\r
+/** call "init" when document is fully loaded */\r
+document.body.onload = init;\r
\r
+function init() {\r
+ let mousePos = new THREE.Vector2();\r
+ \r
+ /**\r
+ * Space left empty under canvas\r
+ * for UI elements\r
+ */\r
+ const canvasSpace = 200;\r
+\r
+ /** Constant Frame Time */\r
+ const frameTime = 1000.0 / 200.0;\r
+\r
+ /** Setup scene */\r
+ let [scene, camera, renderer] = setup_scene(canvasSpace);\r
+ \r
+ const loader = new THREE.TextureLoader();\r
+ //Red color: 0xC70039\r
+\r
+ /** Create cloth and generate mesh */\r
+ const cloth = new Cloth(1, 0.5, 20, 20);\r
+ const clothGeometry = cloth.generateGeometry();\r
+ const clothMaterial = new THREE.MeshStandardMaterial({ map: loader.load('Textures/hsrm2.png'), color: 0xffffff, side: THREE.DoubleSide, flatShading: false });\r
+ //const clothMaterial = new THREE.MeshStandardMaterial({ color: 0xC70039, side: THREE.DoubleSide, flatShading: false });\r
+ const clothMesh = new THREE.Mesh(clothGeometry, clothMaterial);\r
+ scene.add(clothMesh);\r
+ \r
+ /** Register wind checkbox */\r
+ document.getElementById("windToggle").checked = options.wind;\r
+ document.getElementById("windToggle").onchange = (e) => {\r
+ options.wind = e.target.checked;\r
+ };\r
+\r
+ let raycaster = new THREE.Raycaster();\r
+ let intersects;\r
+ let windKeyDown = false;\r
+ let dragKeyDown = false;\r
+ let draggedIndex = -1;\r
+ /**\r
+ * function called every frame\r
+ * @param {number} dt - time passed since last frame in ms\r
+ */\r
function animate(dt) {\r
- requestAnimationFrame(animate);\r
+ /** run simulation step */\r
+ cloth.simulate(dt / 1000);\r
+\r
+ cloth.updateGeometry(clothGeometry);\r
+\r
+ /** raycast from camera to cursor */\r
+ raycaster.setFromCamera(new THREE.Vector2((mousePos.x / w) * 2 - 1, ((h - mousePos.y) / h) * 2 - 1), camera);\r
+ intersects = raycaster.intersectObject(clothMesh);\r
+\r
+ /** provide user interaction */\r
+ if (intersects.length > 0) {\r
+ if (windKeyDown)\r
+ cloth.blow(camera.position, intersects);\r
+ /** "grab" vertex index */\r
+ if (dragKeyDown && draggedIndex == -1)\r
+ draggedIndex = intersects[0].face.a;\r
+ }\r
+ if (dragKeyDown && draggedIndex != -1)\r
+ cloth.drag(calculateMousePosToWorld(mousePos), draggedIndex);\r
+\r
+ /** queue next frame */\r
+ setTimeout(() => {\r
+ animate(frameTime);\r
+ }, frameTime);\r
+\r
renderer.render(scene, camera);\r
}\r
\r
+\r
+ /** add callback for window resize */\r
let canvas = document.getElementsByTagName("canvas")[0];\r
+ let w = window.innerWidth;\r
+ let h = window.innerHeight - canvasSpace;\r
let resize = function () {\r
w = window.innerWidth;\r
- h = window.innerHeight - 200;\r
+ h = window.innerHeight - canvasSpace;\r
canvas.width = w;\r
canvas.height = h;\r
}\r
window.onresize = resize;\r
resize();\r
+\r
+ /**\r
+ * if canvas has been successfully initialized\r
+ * start rendering\r
+ */\r
if (canvas.getContext) {\r
- ctx = canvas.getContext('2d');\r
- animate(performance.now());\r
+ animate(frameTime);\r
}\r
+\r
+ \r
+\r
+ /** add mouse move callback */\r
canvas.onmousemove = (evt) => {\r
mousePos.x = evt.clientX;\r
mousePos.y = evt.clientY;\r
};\r
+\r
+ /**\r
+ * Prevent context menu while blowing wind\r
+ */\r
+ canvas.addEventListener('contextmenu', function(evt) { \r
+ evt.preventDefault();\r
+ }, false);\r
+\r
+ /** register key events */\r
+ document.onkeydown = (evt) => {\r
+ if (evt.code === "KeyW")\r
+ windKeyDown = true;\r
+ if (evt.code === "KeyD")\r
+ dragKeyDown = true;\r
+ };\r
+\r
+ document.onkeyup = (evt) => {\r
+ if (evt.code === "KeyW")\r
+ windKeyDown = false;\r
+ if (evt.code === "KeyD") {\r
+ dragKeyDown = false;\r
+ draggedIndex = -1;\r
+ }\r
+ };\r
+\r
+ /** helper function to turn mouse position into 3D coordinates */\r
+ function calculateMousePosToWorld(mousePos){\r
+ var vec = new THREE.Vector3(); // create once and reuse\r
+ var pos = new THREE.Vector3(); // create once and reuse\r
+\r
+ vec.set(\r
+ (mousePos.x / window.innerWidth) * 2 - 1,\r
+ - (mousePos.y / window.innerHeight) * 2 + 1,\r
+ 0.5);\r
+\r
+ vec.unproject(camera);\r
+\r
+ vec.sub(camera.position).normalize();\r
+\r
+ var distance = - camera.position.z / vec.z;\r
+\r
+ pos.copy(camera.position).add(vec.multiplyScalar(distance));\r
+ return pos;\r
+ }\r
}
\ No newline at end of file
projects / cloth_sim / blobdiff