X-Git-Url: https://gitweb.ps.run/cloth_sim/blobdiff_plain/c2adddfd9ecca5d483cf3147b8bd4870f3ea6150..dcdf429d920b067cf18d50ef9f12032a0cf2dcc2:/Scripts/main.js

diff --git a/Scripts/main.js b/Scripts/main.js
index f395b6c..fb7a8b2 100644
--- a/Scripts/main.js
+++ b/Scripts/main.js
@@ -26,24 +26,195 @@ 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 = [];
+
+    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);
+        }
+      }
+
+      this.createExplicit(vertices, faces);
+    }
+
+    createExplicit(vertices, faces) {
+      for (let i in vertices) {
+        this.geometry.vertices.push(vertices[i]);
+        this.vertexWeights.push(0);
+      }
+      for (let i in faces) {
+        let face = faces[i];
+
+        this.faces.push(face);
+
+        this.geometry.faces.push(new THREE.Face3(
+          face.a, face.b, face.c
+        ));
+        this.geometry.faces.push(new THREE.Face3(
+          face.c, face.b, face.d
+        ));
+        
+        let xLength = vectorLength(this.geometry.vertices[face.b], this.geometry.vertices[face.a]);
+        let yLength = vectorLength(this.geometry.vertices[face.c], this.geometry.vertices[face.a]);
+        let weight = xLength * yLength / 2;
+
+        xLength = vectorLength(this.geometry.vertices[face.b], this.geometry.vertices[face.d]);
+        yLength = vectorLength(this.geometry.vertices[face.c], this.geometry.vertices[face.d]);
+        weight += xLength * yLength / 2;
+
+        this.vertexWeights[face.a] += weight / 4;
+        this.vertexWeights[face.b] += weight / 4;
+        this.vertexWeights[face.c] += weight / 4;
+        this.vertexWeights[face.d] += weight / 4;
+      }
+
+      this.geometry.computeBoundingSphere();
+    }
+
+    createDebugMesh(scene) {
+      function addLine(from, to, color) {
+        let geometry = new THREE.Geometry();
+        geometry.vertices.push(from);
+        geometry.vertices.push(to);
+        let material = new THREE.LineBasicMaterial( { color: color, linewidth: 10 } );
+        let line = new THREE.Line(geometry, material);
+        line.renderOrder = 1;
+        scene.add(line);
+      }
+      function addPoint(point, color) {
+        const geometry = new THREE.SphereGeometry( 0.05, 32, 32 );
+        const material = new THREE.MeshBasicMaterial( { color: color } );
+        const sphere = new THREE.Mesh( geometry, material );
+        sphere.position.set(point.x, point.y, point.z);
+        scene.add( sphere );
+      }
+
+      let lineColor = 0x000000;
+      let pointColor = 0xff00000;
+
+      for (let i in this.faces) {
+        let face = this.faces[i];
+        addLine(this.geometry.vertices[face.a], this.geometry.vertices[face.b], lineColor);
+        addLine(this.geometry.vertices[face.a], this.geometry.vertices[face.c], lineColor);
+        addLine(this.geometry.vertices[face.a], this.geometry.vertices[face.d], lineColor);
+        addLine(this.geometry.vertices[face.b], this.geometry.vertices[face.c], lineColor);
+        addLine(this.geometry.vertices[face.b], this.geometry.vertices[face.d], lineColor);
+        addLine(this.geometry.vertices[face.c], this.geometry.vertices[face.d], lineColor);
+
+        addPoint(this.geometry.vertices[face.a], pointColor);
+        addPoint(this.geometry.vertices[face.b], pointColor);
+        addPoint(this.geometry.vertices[face.c], pointColor);
+        addPoint(this.geometry.vertices[face.d], pointColor);
+      }
+    }
+  }
+
   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();
-  const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
-  const cube = new THREE.Mesh(geometry, material);
-  scene.add(cube);
+  let cloth = new Cloth();
+  cloth.createBasic(10, 10, 5, 5);
+  cloth.createDebugMesh(scene);
+
+  const material = new THREE.MeshBasicMaterial({ color: 0x0000ff });
+  const mesh = new THREE.Mesh(cloth.geometry, material);
+  scene.add(mesh);
 
-  camera.position.z = 5;
+  camera.position.y = 5;
+  camera.position.z = 10;
+  //camera.lookAt(new THREE.Vector3(1, 0, 0));
 
   function animate(dt) {
     requestAnimationFrame(animate);
@@ -60,7 +231,6 @@ function init() {
   window.onresize = resize;
   resize();
   if (canvas.getContext) {
-    ctx = canvas.getContext('2d');
     animate(performance.now());
   }
   canvas.onmousemove = (evt) => {