Added wind to cloth simulation

src/app/pages/algorithms/cloth/cloth.component.html

@@ -3,6 +3,13 @@
     <mat-card-title>{{ 'CLOTH.TITLE' | translate }}</mat-card-title>
   </mat-card-header>
   <mat-card-content>
+    <div class="controls-container">
+      <div class="controls-panel">
+        <button mat-raised-button color="primary" (click)="toggleWind()">
+          {{ isWindActive ? ('CLOTH.WIND_OFF' | translate)  : ('CLOTH.WIND_ON' | translate) }}
+        </button>
+      </div>
+    </div>
     <app-babylon-canvas
       [config]="renderConfig"
       (sceneReady)="onSceneReady($event)"

src/app/pages/algorithms/cloth/cloth.component.ts

@@ -7,7 +7,7 @@ import { Component } from '@angular/core';
 import { MatCard, MatCardContent, MatCardHeader, MatCardTitle } from '@angular/material/card';
 import { TranslatePipe } from '@ngx-translate/core';
 import { BabylonCanvas, RenderConfig, SceneEventData } from '../../../shared/components/render-canvas/babylon-canvas.component';
-import { ComputeShader, StorageBuffer, MeshBuilder, ShaderMaterial, ShaderLanguage, ArcRotateCamera } from '@babylonjs/core';
+import {ComputeShader, StorageBuffer, MeshBuilder, ShaderMaterial, ShaderLanguage, ArcRotateCamera, GroundMesh} from '@babylonjs/core';
 import {
   CLOTH_FRAGMENT_SHADER_WGSL,
   CLOTH_INTEGRATE_COMPUTE_WGSL,
@@ -15,6 +15,7 @@ import {
   CLOTH_VELOCITY_COMPUTE_WGSL,
   CLOTH_VERTEX_SHADER_WGSL
 } from './cloth.shader';
+import {MatButton} from '@angular/material/button';
 
 @Component({
   selector: 'app-cloth',
@@ -24,13 +25,18 @@ import {
     MatCardHeader,
     MatCardTitle,
     TranslatePipe,
-    BabylonCanvas
+    BabylonCanvas,
+    MatButton
   ],
   templateUrl: './cloth.component.html',
   styleUrl: './cloth.component.scss',
 })
 export class ClothComponent {
   private currentSceneData: SceneEventData | null = null;
+  private simulationTime: number = 0;
+  private clothMesh: GroundMesh | null = null;
+  public isWindActive: boolean = false;
+
 
   public renderConfig: RenderConfig = {
     mode: '3D',
@@ -47,6 +53,10 @@ export class ClothComponent {
     this.createSimulation();
   }
 
+  public toggleWind(): void {
+    this.isWindActive = !this.isWindActive;
+  }
+
   /**
    * Initializes and starts the cloth simulation.
    */
@@ -58,10 +68,14 @@ export class ClothComponent {
     const { engine, scene } = this.currentSceneData;
 
     // --- 1. CONFIGURE CLOTH GRID ---
-    const gridWidth = 50;
+    const gridWidth = 100;
-    const gridHeight = 50;
+    const gridHeight = 100;
+    const spacing = 0.05;
     const numVertices = gridWidth * gridHeight;
-    const spacing = 0.1;
+    const density = 1.0;
+    const particleArea = spacing * spacing;
+    const particleMass = density * particleArea;
+    const particleInvMass = 1.0 / particleMass;
 
     const positionsData = new Float32Array(numVertices * 4);
     const prevPositionsData = new Float32Array(numVertices * 4);
@@ -85,7 +99,7 @@ export class ClothComponent {
         positionsData[idx + 0] = (x - gridWidth / 2) * spacing;
         positionsData[idx + 1] = 5.0 - (y * spacing);
         positionsData[idx + 2] = 0.0;
-        positionsData[idx + 3] = (y === 0) ? 0.0 : 1.0;
+        positionsData[idx + 3] = (y === 0) ? 0.0 : particleInvMass;
 
         prevPositionsData[idx + 0] = positionsData[idx + 0];
         prevPositionsData[idx + 1] = positionsData[idx + 1];
@@ -192,7 +206,11 @@ export class ClothComponent {
     csVelocity.setStorageBuffer("velocities", velocitiesBuffer);
 
     // --- 4. SETUP RENDER MESH ---
-    const clothMesh = MeshBuilder.CreateGround("cloth", { width: 10, height: 10, subdivisions: gridWidth - 1 }, scene);
+    if (this.clothMesh)
+    {
+      scene.removeMesh(this.clothMesh);
+    }
+    this.clothMesh = MeshBuilder.CreateGround("cloth", { width: 10, height: 10, subdivisions: gridWidth - 1 }, scene);
 
     const clothMaterial = new ShaderMaterial("clothMat", scene, {
       vertexSource: CLOTH_VERTEX_SHADER_WGSL,
@@ -206,7 +224,7 @@ export class ClothComponent {
 
     clothMaterial.backFaceCulling = false;
     clothMaterial.setStorageBuffer("positions", positionsBuffer);
-    clothMesh.material = clothMaterial;
+    this.clothMesh.material = clothMaterial;
 
     const camera = scene.activeCamera as ArcRotateCamera;
     if (camera) {
@@ -218,10 +236,24 @@ export class ClothComponent {
     // --- 5. RENDER LOOP ---
     scene.onBeforeRenderObservable.clear();
     scene.onBeforeRenderObservable.add(() => {
+      this.simulationTime += engine.getDeltaTime() / 1000.0;
+
+      const windX = this.isWindActive ? 5.0 : 0.0;
+      const windY = 0.0;
+      const windZ = this.isWindActive ? 15.0 : 0.0;
+
+      const baseCompliance = 0.00001;
+      const scaledCompliance = baseCompliance * particleInvMass * spacing;
+
       paramsData[0] = 0.016;
       paramsData[1] = -9.81;
-      paramsData[2] = 0.0001; // Compliance (very small = stiff fabric)
+      paramsData[2] = scaledCompliance; //scaled stiffness
       paramsData[3] = numVertices;
+      paramsData[4] = windX;
+      paramsData[5] = windY;
+      paramsData[6] = windZ;
+      paramsData[7] = this.simulationTime;
+
       paramsBuffer.update(paramsData);
 
       const dispatchXVertices = Math.ceil(numVertices / 64);
@@ -230,7 +262,8 @@ export class ClothComponent {
       csIntegrate.dispatch(dispatchXVertices, 1, 1);
 
       // 2. XPBD Solver (Substeps) - Solve each color individually
-      for (let i = 0; i < 5; i++) {
+      const substeps = 15;
+      for (let i = 0; i < substeps; i++) {
         csSolve0.dispatch(Math.ceil((constraintsP0.length / 4) / 64), 1, 1);
         csSolve1.dispatch(Math.ceil((constraintsP1.length / 4) / 64), 1, 1);
         csSolve2.dispatch(Math.ceil((constraintsP2.length / 4) / 64), 1, 1);

src/app/pages/algorithms/cloth/cloth.shader.ts

@@ -6,14 +6,14 @@
 // --- SHARED DATA STRUCTURES ---
 export const CLOTH_SHARED_STRUCTS = `
     struct Params {
-        dt: f32,              // Time step per substep
+        dt: f32,
-        gravity_y: f32,       // Gravity (e.g. -9.81)
+        gravity_y: f32,
-        compliance: f32,      // Inverse stiffness (0.0 = completely rigid)
+        compliance: f32,
-        numVertices: f32,     // Total number of vertices
+        numVertices: f32,
-        numConstraints: f32,  // Total number of springs
+        wind_x: f32,
-        pad1: f32,            // Padding
+        wind_y: f32,
-        pad2: f32,            // Padding
+        wind_z: f32,
-        pad3: f32             // Padding (8 * f32 = 32 bytes)
+        time: f32
     };
 `;
 
@@ -76,17 +76,25 @@ export const CLOTH_INTEGRATE_COMPUTE_WGSL = CLOTH_SHARED_STRUCTS + `
 
         var pos = positions[idx];
         var vel = velocities[idx];
-        let invMass = pos.w; // w stores inverse mass (0.0 = pinned/static)
+        let invMass = pos.w;
 
-        // Only move if it is not pinned
         if (invMass > 0.0) {
-            // 1. Apply Gravity: v = v + g * dt
             vel.y = vel.y + (p.gravity_y * p.dt);
 
-            // 2. Save current position for later velocity calculation
+            let flutter = sin(pos.x * 2.0 + p.time * 5.0) * cos(pos.y * 2.0 + p.time * 3.0);
+
+            let windForce = vec3<f32>(
+                p.wind_x + (flutter * p.wind_x * 0.8),
+                p.wind_y + (flutter * 2.0), // Leichter Auftrieb durchs Flattern
+                p.wind_z + (flutter * p.wind_z * 0.8)
+            );
+
+            vel.x = vel.x + (windForce.x * p.dt);
+            vel.y = vel.y + (windForce.y * p.dt);
+            vel.z = vel.z + (windForce.z * p.dt);
+
             prev_positions[idx] = pos;
 
-            // 3. Predict new position: p = p + v * dt
             pos.x = pos.x + vel.x * p.dt;
             pos.y = pos.y + vel.y * p.dt;
             pos.z = pos.z + vel.z * p.dt;

src/assets/i18n/de.json

@@ -472,7 +472,9 @@
     }
   },
   "CLOTH": {
-    "TITLE": "Stoff-Simulation"
+    "TITLE": "Stoff-Simulation",
+    "WIND_ON": "Wind Einschalten",
+    "WIND_OFF": "Wind Ausschalten"
   },
   "ALGORITHM": {
     "TITLE": "Algorithmen",

src/assets/i18n/en.json

@@ -471,7 +471,9 @@
     }
   },
   "CLOTH": {
-    "TITLE": "Cloth simulation"
+    "TITLE": "Cloth simulation",
+    "WIND_ON": "Wind On",
+    "WIND_OFF": "Wind Off"
   },
   "ALGORITHM": {
     "TITLE": "Algorithms",