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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js physics - rapier3d instancing</title>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
- <link type="text/css" rel="stylesheet" href="main.css">
- </head>
- <body>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> physics - <a href="https://github.com/dimforge/rapier.js" target="_blank">rapier</a> instancing
- </div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- import { RapierPhysics } from 'three/addons/physics/RapierPhysics.js';
- import Stats from 'three/addons/libs/stats.module.js';
- let camera, scene, renderer, stats;
- let physics, position;
- let boxes, spheres;
- init();
- async function init() {
- physics = await RapierPhysics();
- position = new THREE.Vector3();
- //
- camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 100 );
- camera.position.set( - 1, 1.5, 2 );
- camera.lookAt( 0, 0.5, 0 );
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0x666666 );
- const hemiLight = new THREE.HemisphereLight();
- scene.add( hemiLight );
- const dirLight = new THREE.DirectionalLight( 0xffffff, 3 );
- dirLight.position.set( 5, 5, 5 );
- dirLight.castShadow = true;
- dirLight.shadow.camera.zoom = 2;
- scene.add( dirLight );
- const floor = new THREE.Mesh(
- new THREE.BoxGeometry( 10, 5, 10 ),
- new THREE.ShadowMaterial( { color: 0x444444 } )
- );
- floor.position.y = - 2.5;
- floor.receiveShadow = true;
- floor.userData.physics = { mass: 0 };
- scene.add( floor );
- //
- const material = new THREE.MeshLambertMaterial();
- const matrix = new THREE.Matrix4();
- const color = new THREE.Color();
- // Boxes
- const geometryBox = new THREE.BoxGeometry( 0.075, 0.075, 0.075 );
- boxes = new THREE.InstancedMesh( geometryBox, material, 400 );
- boxes.instanceMatrix.setUsage( THREE.DynamicDrawUsage ); // will be updated every frame
- boxes.castShadow = true;
- boxes.receiveShadow = true;
- boxes.userData.physics = { mass: 1 };
- scene.add( boxes );
- for ( let i = 0; i < boxes.count; i ++ ) {
- matrix.setPosition( Math.random() - 0.5, Math.random() * 2, Math.random() - 0.5 );
- boxes.setMatrixAt( i, matrix );
- boxes.setColorAt( i, color.setHex( 0xffffff * Math.random() ) );
- }
- // Spheres
- const geometrySphere = new THREE.IcosahedronGeometry( 0.05, 4 );
- spheres = new THREE.InstancedMesh( geometrySphere, material, 400 );
- spheres.instanceMatrix.setUsage( THREE.DynamicDrawUsage ); // will be updated every frame
- spheres.castShadow = true;
- spheres.receiveShadow = true;
- spheres.userData.physics = { mass: 1 };
- scene.add( spheres );
- for ( let i = 0; i < spheres.count; i ++ ) {
- matrix.setPosition( Math.random() - 0.5, Math.random() * 2, Math.random() - 0.5 );
- spheres.setMatrixAt( i, matrix );
- spheres.setColorAt( i, color.setHex( 0xffffff * Math.random() ) );
- }
- physics.addScene( scene );
- //
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- renderer.shadowMap.enabled = true;
- document.body.appendChild( renderer.domElement );
- stats = new Stats();
- document.body.appendChild( stats.dom );
- //
- const controls = new OrbitControls( camera, renderer.domElement );
- controls.target.y = 0.5;
- controls.update();
- setInterval( () => {
- let index = Math.floor( Math.random() * boxes.count );
- position.set( 0, Math.random() + 1, 0 );
- physics.setMeshPosition( boxes, position, index );
- //
- index = Math.floor( Math.random() * spheres.count );
- position.set( 0, Math.random() + 1, 0 );
- physics.setMeshPosition( spheres, position, index );
- }, 1000 / 60 );
- }
- function animate() {
- renderer.render( scene, camera );
- stats.update();
- }
- </script>
- </body>
- </html>
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