Add Spring Property

[cloth_sim] / Scripts / main.js

diff --git a/Scripts/main.js b/Scripts/main.js
index 843c19a5044a32bc6ee7a24d8d01cdd4ecc50f59..1f26606ebe8b0d325ca067c033bfe41558170f22 100644 (file)
--- a/Scripts/main.js
+++ b/Scripts/main.js
@@ -26,10 +26,55 @@ function init() {
     }\r
   }\r
 \r
+  function vectorLength(a, b) {\r
+    let v1 = new THREE.Vector3();\r
+    v1.set(a.x, a.y, a.z);\r
+    let v2 = new THREE.Vector3();\r
+    v2.set(b.x, b.y, b.z);\r
+\r
+    return v1.sub(v2).length();\r
+  }\r
+\r
+  class Face {\r
+    a;\r
+    b;\r
+    c;\r
+    d;\r
+\r
+    springs = [];\r
+\r
+    constructor(a, b, c, d) {\r
+      this.a = a;\r
+      this.b = b;\r
+      this.c = c;\r
+      this.d = d;\r
+    }\r
+  }\r
+\r
+  class Spring {\r
+    restLength;\r
+    currentLength;\r
+    index1;\r
+    index2;\r
+\r
+    constructor(vertices, index1, index2) {\r
+      this.index1 = index1;\r
+      this.index2 = index2;\r
+\r
+      let length = vectorLength(vertices[index1], vertices[index2]);\r
+      this.restLength = length;\r
+      this.currentLength = length;\r
+    }\r
+  }\r
+\r
   class Cloth {\r
+    VertexWeight = 1;\r
+\r
     geometry = new THREE.Geometry();\r
 \r
-    \r
+    faces = [];\r
+\r
+    vertexWeights = [];\r
 \r
     static CreateBasic(width, height, numPointsWidth, numPointsHeight) {\r
       let vertices = [];\r
@@ -52,20 +97,21 @@ function init() {
       \r
       for (let y = 0; y < numPointsHeight - 1; y++) {\r
         for (let x = 0; x < numPointsWidth - 1; x++) {\r
-          faces.push(\r
-            new THREE.Face3(\r
-              getVertexIndex(x, y),\r
-              getVertexIndex(x, y + 1),\r
-              getVertexIndex(x + 1, y),\r
-            )\r
-          );\r
-          faces.push(\r
-            new THREE.Face3(\r
-              getVertexIndex(x + 1, y),\r
-              getVertexIndex(x, y + 1),\r
-              getVertexIndex(x + 1, y + 1),\r
-            )\r
+          let newFace = 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
+          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
+          \r
+          faces.push(newFace);\r
         }\r
       }\r
 \r
@@ -77,9 +123,33 @@ function init() {
 \r
       for (let i in vertices) {\r
         result.geometry.vertices.push(vertices[i]);\r
+        result.vertexWeights.push(0);\r
       }\r
+      console.log(vertices);\r
       for (let i in faces) {\r
-        result.geometry.faces.push(faces[i]);\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
+        console.log(face);\r
+        \r
+        let xLength = vectorLength(result.geometry.vertices[face.b], result.geometry.vertices[face.a]);\r
+        let yLength = vectorLength(result.geometry.vertices[face.c], result.geometry.vertices[face.a]);\r
+        let weight = xLength * yLength / 2;\r
+\r
+        xLength = vectorLength(result.geometry.vertices[face.b], result.geometry.vertices[face.d]);\r
+        yLength = vectorLength(result.geometry.vertices[face.c], result.geometry.vertices[face.d]);\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
@@ -102,7 +172,7 @@ function init() {
   const directionalLight = new THREE.DirectionalLight(0xffffff, 1);\r
   scene.add(directionalLight);\r
 \r
-  let cloth = Cloth.CreateBasic(10, 10, 4, 4);\r
+  let cloth = Cloth.CreateBasic(10, 10, 5, 5);\r
   const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });\r
   const mesh = new THREE.Mesh(cloth.geometry, material);\r
   scene.add(mesh);\r