X-Git-Url: https://gitweb.ps.run/cloth_sim/blobdiff_plain/c2adddfd9ecca5d483cf3147b8bd4870f3ea6150..922aa01da3aa479023c94bb5c016d437f94b6f93:/Scripts/main.js

diff --git a/Scripts/main.js b/Scripts/main.js
index f395b6c..1f26606 100644
--- a/Scripts/main.js
+++ b/Scripts/main.js
@@ -26,24 +26,159 @@ function init() {
     }
   }
 
+  function vectorLength(a, b) {
+    let v1 = new THREE.Vector3();
+    v1.set(a.x, a.y, a.z);
+    let v2 = new THREE.Vector3();
+    v2.set(b.x, b.y, b.z);
+
+    return v1.sub(v2).length();
+  }
+
+  class Face {
+    a;
+    b;
+    c;
+    d;
+
+    springs = [];
+
+    constructor(a, b, c, d) {
+      this.a = a;
+      this.b = b;
+      this.c = c;
+      this.d = d;
+    }
+  }
+
+  class Spring {
+    restLength;
+    currentLength;
+    index1;
+    index2;
+
+    constructor(vertices, index1, index2) {
+      this.index1 = index1;
+      this.index2 = index2;
+
+      let length = vectorLength(vertices[index1], vertices[index2]);
+      this.restLength = length;
+      this.currentLength = length;
+    }
+  }
+
+  class Cloth {
+    VertexWeight = 1;
+
+    geometry = new THREE.Geometry();
+
+    faces = [];
+
+    vertexWeights = [];
+
+    static CreateBasic(width, height, numPointsWidth, numPointsHeight) {
+      let vertices = [];
+      let faces = [];
+
+      let stepWidth = width / (numPointsWidth - 1);
+      let stepHeight = height / (numPointsHeight - 1);
+
+      for (let y = 0; y < numPointsHeight; y++) {
+        for (let x = 0; x < numPointsWidth; x++) {
+          vertices.push(
+            new THREE.Vector3(x * stepWidth, height - y * stepHeight, 0)
+          );
+        }
+      }
+
+      function getVertexIndex(x, y) {
+        return y * numPointsWidth + x;
+      }
+      
+      for (let y = 0; y < numPointsHeight - 1; y++) {
+        for (let x = 0; x < numPointsWidth - 1; x++) {
+          let newFace = new Face(
+            getVertexIndex(x, y),
+            getVertexIndex(x, y + 1),
+            getVertexIndex(x + 1, y),
+            getVertexIndex(x + 1, y + 1),
+          );
+
+          newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x + 1, y)));
+          newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x, y + 1)));
+          newFace.springs.push(new Spring(vertices, getVertexIndex(x, y), getVertexIndex(x + 1, y + 1)));
+          newFace.springs.push(new Spring(vertices, getVertexIndex(x + 1, y), getVertexIndex(x, y + 1)));
+          newFace.springs.push(new Spring(vertices, getVertexIndex(x + 1, y), getVertexIndex(x + 1, y + 1)));
+          newFace.springs.push(new Spring(vertices, getVertexIndex(x, y + 1), getVertexIndex(x + 1, y + 1)));
+          
+          faces.push(newFace);
+        }
+      }
+
+      return this.CreateExplicit(vertices, faces);
+    }
+
+    static CreateExplicit(vertices, faces) {
+      let result = new Cloth();
+
+      for (let i in vertices) {
+        result.geometry.vertices.push(vertices[i]);
+        result.vertexWeights.push(0);
+      }
+      console.log(vertices);
+      for (let i in faces) {
+        let face = faces[i];
+
+        result.geometry.faces.push(new THREE.Face3(
+          face.a, face.b, face.c
+        ));
+        result.geometry.faces.push(new THREE.Face3(
+          face.c, face.b, face.d
+        ));
+
+        console.log(face);
+        
+        let xLength = vectorLength(result.geometry.vertices[face.b], result.geometry.vertices[face.a]);
+        let yLength = vectorLength(result.geometry.vertices[face.c], result.geometry.vertices[face.a]);
+        let weight = xLength * yLength / 2;
+
+        xLength = vectorLength(result.geometry.vertices[face.b], result.geometry.vertices[face.d]);
+        yLength = vectorLength(result.geometry.vertices[face.c], result.geometry.vertices[face.d]);
+        weight += xLength * yLength / 2;
+
+        result.vertexWeights[face.a] += weight / 4;
+        result.vertexWeights[face.b] += weight / 4;
+        result.vertexWeights[face.c] += weight / 4;
+        result.vertexWeights[face.d] += weight / 4;
+      }
+
+      result.geometry.computeBoundingSphere();
+
+      return result;
+    }
+  }
+
   let mousePos = new Point();
 
+  const canvasSpace = 200;
+
   const scene = new THREE.Scene();
-  const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
+  const camera = new THREE.PerspectiveCamera(75, window.innerWidth / (window.innerHeight - canvasSpace), 0.1, 1000);
 
   const renderer = new THREE.WebGLRenderer();
-  renderer.setSize(window.innerWidth, window.innerHeight - 200);
+  renderer.setSize(window.innerWidth, window.innerHeight - canvasSpace);
   document.getElementById("threejscontainer").appendChild(renderer.domElement);
 
   const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
   scene.add(directionalLight);
 
-  const geometry = new THREE.BoxGeometry();
+  let cloth = Cloth.CreateBasic(10, 10, 5, 5);
   const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
-  const cube = new THREE.Mesh(geometry, material);
-  scene.add(cube);
+  const mesh = new THREE.Mesh(cloth.geometry, material);
+  scene.add(mesh);
 
-  camera.position.z = 5;
+  camera.position.y = 5;
+  camera.position.z = 10;
 
   function animate(dt) {
     requestAnimationFrame(animate);