From fc396e0a9cd744fa4d2c37f0052f395320580cc5 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Patrick=20Sch=C3=B6nberger?= <patrick.schoenberger@posteo.de>
Date: Mon, 4 Jan 2021 15:29:58 +0100
Subject: [PATCH] Rendering Cloth

---
 Scripts/main.js | 77 +++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 71 insertions(+), 6 deletions(-)

diff --git a/Scripts/main.js b/Scripts/main.js
index f395b6c..843c19a 100644
--- a/Scripts/main.js
+++ b/Scripts/main.js
@@ -26,24 +26,89 @@ function init() {
     }
   }
 
+  class Cloth {
+    geometry = new THREE.Geometry();
+
+    
+
+    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++) {
+          faces.push(
+            new THREE.Face3(
+              getVertexIndex(x, y),
+              getVertexIndex(x, y + 1),
+              getVertexIndex(x + 1, y),
+            )
+          );
+          faces.push(
+            new THREE.Face3(
+              getVertexIndex(x + 1, y),
+              getVertexIndex(x, y + 1),
+              getVertexIndex(x + 1, y + 1),
+            )
+          );
+        }
+      }
+
+      return this.CreateExplicit(vertices, faces);
+    }
+
+    static CreateExplicit(vertices, faces) {
+      let result = new Cloth();
+
+      for (let i in vertices) {
+        result.geometry.vertices.push(vertices[i]);
+      }
+      for (let i in faces) {
+        result.geometry.faces.push(faces[i]);
+      }
+
+      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, 4, 4);
   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);
-- 
2.50.1