*/\r
function vectorLength(a, b) {\r
let v1 = new THREE.Vector3();\r
- v1.set(a.x, a.y, a.z);\r
+ v1.copy(a);\r
let v2 = new THREE.Vector3();\r
- v2.set(b.x, b.y, b.z);\r
+ v2.copy(b);\r
\r
return v1.sub(v2).length();\r
}\r
}\r
\r
getDirection(vertices) {\r
- let direction = new THREE.Vector3(\r
- vertices[this.index1].x,\r
- vertices[this.index1].y,\r
- vertices[this.index1].z\r
- );\r
+ let direction = new THREE.Vector3();\r
+ direction.copy(vertices[this.index1]);\r
\r
direction.sub(vertices[this.index2]);\r
direction.divideScalar(vectorLength(vertices[this.index1], vertices[this.index2]));\r
\r
return direction;\r
}\r
+\r
+ update(vertices) {\r
+ let length = vectorLength(vertices[this.index1], vertices[this.index2]);\r
+ this.currentLength = length;\r
+ }\r
}\r
\r
/**\r
\r
vertexWeights = [];\r
\r
-\r
+ vertexRigidness = [];\r
\r
/**\r
* creates a rectangular piece of cloth\r
getVertexIndex(x + 1, y + 1),\r
);\r
\r
- newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x + 1, y)));\r
- newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x, y + 1)));\r
- newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x + 1, y + 1)));\r
- newFace.springs.push(new Spring(vertices, getVertexIndex(x + 1, y), getVertexIndex(x, y + 1)));\r
- newFace.springs.push(new Spring(vertices, getVertexIndex(x + 1, y), getVertexIndex(x + 1, y + 1)));\r
- newFace.springs.push(new Spring(vertices, getVertexIndex(x, y + 1), getVertexIndex(x + 1, y + 1)));\r
+ newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x + 1, y))); // oben\r
+ newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x, y + 1))); // links\r
+ newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x + 1, y + 1))); // oben links -> unten rechts diagonal\r
+ newFace.springs.push(new Spring(vertices, getVertexIndex(x + 1, y), getVertexIndex(x, y + 1))); // oben rechts -> unten links diagonal\r
+ newFace.springs.push(new Spring(vertices, getVertexIndex(x + 1, y), getVertexIndex(x + 1, y + 1))); // rechts\r
+ newFace.springs.push(new Spring(vertices, getVertexIndex(x, y + 1), getVertexIndex(x + 1, y + 1))); // unten\r
\r
faces.push(newFace);\r
}\r
* with generated vertices and faces\r
*/\r
this.createExplicit(vertices, faces);\r
+\r
+ /**\r
+ * hand cloth from left and right upper corners\r
+ */\r
+ this.vertexRigidness[0] = true;\r
+ this.vertexRigidness[numPointsWidth-1] = true;\r
}\r
\r
/**\r
* Copy vertices and initialize vertex weights to 0\r
*/\r
for (let i in vertices) {\r
- this.geometry.vertices.push(vertices[i]);\r
- this.previousPositions.push(vertices[i]);\r
+ this.geometry.vertices.push(vertices[i].clone());\r
+ this.previousPositions.push(vertices[i].clone());\r
+ // this.geometry.vertices.push(vertices[i]);\r
+ // this.previousPositions.push(vertices[i]);\r
this.vertexWeights.push(0);\r
+ this.vertexRigidness.push(false);\r
}\r
/**\r
* copy faces,\r
* needed for View Frustum Culling internally\r
*/\r
this.geometry.computeBoundingSphere();\r
+ this.geometry.computeFaceNormals();\r
}\r
\r
/**\r
time = 0;\r
/**\r
* \r
- * @param {number} dt \r
+ * @param {number} dt time in seconds since last frame\r
*/\r
simulate(dt) {\r
-\r
-\r
-\r
for (let i in this.geometry.vertices) {\r
- let currentPosition;\r
let acceleration = this.getAcceleration(i, dt);\r
+\r
+ //acceleration.clampLength(0, 10);\r
+\r
+ if (Math.abs(acceleration.length()) <= 10e-4) {\r
+ acceleration.set(0, 0, 0);\r
+ }\r
\r
- currentPosition = this.verlet(this.geometry.vertices[i], this.previousPositions[i], acceleration, dt/2000);\r
+ let currentPosition = this.verlet(this.geometry.vertices[i].clone(), this.previousPositions[i].clone(), acceleration, dt);\r
+ //let currentPosition = this.euler(this.geometry.vertices[i], acceleration, dt);\r
\r
- this.previousPositions[i] = currentPosition;\r
- this.geometry.vertices[i] = currentPosition;\r
- \r
+ this.previousPositions[i].copy(this.geometry.vertices[i]);\r
+ this.geometry.vertices[i].copy(currentPosition);\r
}\r
- console.log(this.geometry.vertices[0]);\r
+ //console.log(this.getAcceleration(1, dt));\r
+ \r
this.time += dt;\r
\r
+ for (let face of this.faces) {\r
+ for (let spring of face.springs) {\r
+ spring.update(this.geometry.vertices);\r
+ }\r
+ }\r
+\r
/**\r
* let THREE JS compute bounding sphere around generated mesh\r
* needed for View Frustum Culling internally\r
this.geometry.verticesNeedUpdate = true;\r
this.geometry.elementsNeedUpdate = true;\r
this.geometry.computeBoundingSphere();\r
+ this.geometry.computeFaceNormals();\r
\r
}\r
\r
* @param {number} dt The time passed since last frame\r
*/\r
getAcceleration(vertexIndex, dt) {\r
+ if (this.vertexRigidness[vertexIndex])\r
+ return new THREE.Vector3(0, 0, 0);\r
\r
let vertex = this.geometry.vertices[vertexIndex];\r
\r
// Mass of vertex\r
let M = this.vertexWeights[vertexIndex];\r
// constant gravity\r
- let g = new THREE.Vector3(0, -1.8, 0);\r
+ let g = new THREE.Vector3(0, -9.8, 0);\r
// stiffness\r
- let k = 5;\r
+ let k = 1000;\r
\r
// Wind vector\r
let fWind = new THREE.Vector3(\r
Math.sin(vertex.x * vertex.y * this.time),\r
- Math.cos(vertex.z* this.time),\r
+ Math.cos(vertex.z * this.time),\r
Math.sin(Math.cos(5 * vertex.x * vertex.y * vertex.z))\r
);\r
\r
* constant determined by the properties of the surrounding fluids (air)\r
* achievement of cloth effects through try out\r
* */\r
- let a = 1;\r
-\r
+ let a = 0.1;\r
+ \r
let velocity = new THREE.Vector3(\r
- (vertex.x - this.previousPositions[vertexIndex].x) / dt,\r
- (vertex.y - this.previousPositions[vertexIndex].y) / dt,\r
- (vertex.z - this.previousPositions[vertexIndex].z) / dt\r
+ (this.previousPositions[vertexIndex].x - vertex.x) / dt,\r
+ (this.previousPositions[vertexIndex].y - vertex.y) / dt,\r
+ (this.previousPositions[vertexIndex].z - vertex.z) / dt\r
);\r
\r
+ //console.log(velocity, vertex, this.previousPositions[vertexIndex]);\r
\r
- let fAirResistance = velocity.multiplyScalar(-a);\r
-\r
+ let fAirResistance = velocity.multiply(velocity).multiplyScalar(-a);\r
+ \r
let springSum = new THREE.Vector3(0, 0, 0);\r
\r
// Get the bounding springs and add them to the needed springs\r
- for (let i in this.faces) {\r
- if (this.faces[i].a == vertexIndex || this.faces[i].b == vertexIndex || this.faces[i].c == vertexIndex || this.faces[i].d == vertexIndex) {\r
- for (let j in this.faces[i].springs) {\r
- if (this.faces[i].springs[j].index1 == vertexIndex || this.faces[i].springs[j].index2 == vertexIndex) {\r
+ // TODO: optimize\r
\r
- let spring = this.faces[i].springs[j];\r
- let springDirection = spring.getDirection(this.geometry.vertices);\r
+ const numPointsX = 10;\r
+ const numPointsY = 10;\r
+ const numFacesX = numPointsX - 1;\r
+ const numFacesY = numPointsY - 1;\r
\r
+ function getFaceIndex(x, y) {\r
+ return y * numFacesX + x;\r
+ }\r
+\r
+ let indexX = vertexIndex % numPointsX;\r
+ let indexY = Math.floor(vertexIndex / numPointsX);\r
+\r
+ let springs = [];\r
+\r
+ // 0 oben\r
+ // 1 links\r
+ // 2 oben links -> unten rechts diagonal\r
+ // 3 oben rechts -> unten links diagonal\r
+ // 4 rechts\r
+ // 5 unten\r
+\r
+ let ul = indexX > 0 && indexY < numPointsY - 1;\r
+ let ur = indexX < numPointsX - 1 && indexY < numPointsY - 1;\r
+ let ol = indexX > 0 && indexY > 0;\r
+ let or = indexX < numPointsX - 1 && indexY > 0;\r
+\r
+ if (ul) {\r
+ let faceUL = this.faces[getFaceIndex(indexX - 1, indexY)];\r
+ springs.push(faceUL.springs[3]);\r
+ if (!ol)\r
+ springs.push(faceUL.springs[0]);\r
+ springs.push(faceUL.springs[4]);\r
+ }\r
+ if (ur) {\r
+ let faceUR = this.faces[getFaceIndex(indexX, indexY)];\r
+ springs.push(faceUR.springs[2]);\r
+ if (!or)\r
+ springs.push(faceUR.springs[0]);\r
+ if (!ul)\r
+ springs.push(faceUR.springs[1]);\r
+ }\r
+ if (ol) {\r
+ let faceOL = this.faces[getFaceIndex(indexX - 1, indexY - 1)];\r
+ springs.push(faceOL.springs[2]);\r
+ springs.push(faceOL.springs[4]);\r
+ springs.push(faceOL.springs[5]);\r
+ }\r
+ if (or) {\r
+ let faceOR = this.faces[getFaceIndex(indexX , indexY - 1)];\r
+ springs.push(faceOR.springs[3]);\r
+ if (!ol)\r
+ springs.push(faceOR.springs[1]);\r
+ springs.push(faceOR.springs[5]);\r
+ }\r
\r
- if (this.faces[i].springs[j].index1 == vertexIndex)\r
- springDirection.multiplyScalar(-1);\r
+ for (let spring of springs) {\r
+ let springDirection = spring.getDirection(this.geometry.vertices);\r
\r
- springSum.add(springDirection.multiplyScalar(k * (spring.currentLength - spring.restLength)));\r
+ if (spring.index1 == vertexIndex)\r
+ springDirection.multiplyScalar(-1);\r
\r
- }\r
- }\r
- }\r
+ springSum.add(springDirection.multiplyScalar(k * (spring.restLength - spring.currentLength)));\r
}\r
-\r
\r
let result = new THREE.Vector3(1, 1, 1);\r
\r
- \r
- result.multiplyScalar(M).multiply(g).add(fWind).add(fAirResistance).sub(springSum);\r
- \r
+ let temp = result.multiplyScalar(M).multiply(g).add(fWind).add(fAirResistance).clone();\r
+ result.sub(springSum);\r
+ document.getElementById("Output").innerText = "SpringSum: " + Math.floor(springSum.y) + "\nTemp: " + Math.floor(temp.y);\r
\r
return result;\r
-\r
-\r
}\r
\r
/**\r
// next position = 2 * current Position - previous position + acceleration * (passed time)^2\r
// acceleration (dv/dt) = F(net)\r
// Dependency for one vertex: gravity, fluids/air, springs\r
+ const DRAG = 0.97;\r
+ let nextPosition = new THREE.Vector3(\r
+ (currentPosition.x - previousPosition.x) * DRAG + currentPosition.x + acceleration.x * (passedTime * passedTime),\r
+ (currentPosition.y - previousPosition.y) * DRAG + currentPosition.y + acceleration.y * (passedTime * passedTime),\r
+ (currentPosition.z - previousPosition.z) * DRAG + currentPosition.z + acceleration.z * (passedTime * passedTime),\r
+ );\r
\r
+ // let nextPosition = new THREE.Vector3(\r
+ // (2 * currentPosition.x) - previousPosition.x + acceleration.x * (passedTime * passedTime),\r
+ // (2 * currentPosition.y) - previousPosition.y + acceleration.y * (passedTime * passedTime),\r
+ // (2 * currentPosition.z) - previousPosition.z + acceleration.z * (passedTime * passedTime),\r
+ // );\r
+\r
+ return nextPosition;\r
+}\r
+\r
+euler(currentPosition, acceleration, passedTime) {\r
let nextPosition = new THREE.Vector3(\r
- 2 * currentPosition.x - previousPosition.x + acceleration.x * (passedTime * passedTime),\r
- 2 * currentPosition.y - previousPosition.y + acceleration.y * (passedTime * passedTime),\r
- 2 * currentPosition.z - previousPosition.z + acceleration.z * (passedTime * passedTime),\r
+ currentPosition.x + acceleration.x * passedTime,\r
+ currentPosition.y + acceleration.y * passedTime,\r
+ currentPosition.z + acceleration.z * passedTime,\r
);\r
\r
return nextPosition;\r
}\r
\r
+wind(intersects) {\r
+ let intersect = intersects[0];\r
+ this.geometry.vertices[intersect.face.a].z -= 0.05;\r
+ this.geometry.vertices[intersect.face.b].z -= 0.05;\r
+ this.geometry.vertices[intersect.face.c].z -= 0.05;\r
+}\r
\r
}\r
\r
projects / cloth_sim / blobdiff