Change Face Representation

[cloth_sim] / Scripts / main.js

diff --git a/Scripts/main.js b/Scripts/main.js
index f395b6c19993a1c5821ff1ee5ae8d4164629ab32..2388293d3b167ef8d4603bf24b794601e3e62089 100644 (file)
--- a/Scripts/main.js
+++ b/Scripts/main.js
@@ -26,24 +26,138 @@ function init() {
     }\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
+\r
+    faces = [];\r
+\r
+    vertexWeights = [];\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
+\r
   const scene = new THREE.Scene();\r
-  const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);\r
+  const camera = new THREE.PerspectiveCamera(75, window.innerWidth / (window.innerHeight - canvasSpace), 0.1, 1000);\r
 \r
   const renderer = new THREE.WebGLRenderer();\r
-  renderer.setSize(window.innerWidth, window.innerHeight - 200);\r
+  renderer.setSize(window.innerWidth, window.innerHeight - canvasSpace);\r
   document.getElementById("threejscontainer").appendChild(renderer.domElement);\r
 \r
   const directionalLight = new THREE.DirectionalLight(0xffffff, 1);\r
   scene.add(directionalLight);\r
 \r
-  const geometry = new THREE.BoxGeometry();\r
+  let cloth = Cloth.CreateBasic(10, 10, 4, 4);\r
   const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });\r
-  const cube = new THREE.Mesh(geometry, material);\r
-  scene.add(cube);\r
+  const mesh = new THREE.Mesh(cloth.geometry, material);\r
+  scene.add(mesh);\r
 \r
-  camera.position.z = 5;\r
+  camera.position.y = 5;\r
+  camera.position.z = 10;\r
 \r
   function animate(dt) {\r
     requestAnimationFrame(animate);\r