javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js physics - cannon.js 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 - cannon.js instancing
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';
			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import { CannonPhysics } from './jsm/physics/CannonPhysics.js';
			import Stats from './jsm/libs/stats.module.js';

			var camera, scene, renderer, stats;
			var physics, position;

			init();
			animate();

			function init() {

				physics = new CannonPhysics();
				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 );

				var light = new THREE.HemisphereLight();
				light.intensity = 0.35;
				scene.add( light );

				var light = new THREE.DirectionalLight();
				light.position.set( 5, 5, 5 );
				light.castShadow = true;
				light.shadow.camera.zoom = 2;
				scene.add( light );

				var plane = new THREE.Mesh(
					new THREE.PlaneBufferGeometry( 5, 5 ),
					new THREE.ShadowMaterial( { color: 0x111111 } )
				);
				plane.rotation.x = - Math.PI / 2;
				plane.receiveShadow = true;
				scene.add( plane );
				physics.addMesh( plane );

				var geometry = new THREE.BoxBufferGeometry( 0.1, 0.1, 0.1 );
				var material = new THREE.MeshLambertMaterial();
				var mesh = new THREE.InstancedMesh( geometry, material, 200 );
				mesh.instanceMatrix.setUsage( THREE.DynamicDrawUsage ); // will be updated every frame
				mesh.castShadow = true;
				mesh.receiveShadow = true;
				scene.add( mesh );

				var matrix = new THREE.Matrix4();
				var color = new THREE.Color();

				for ( var i = 0; i < mesh.count; i ++ ) {

					matrix.setPosition( Math.random() - 0.5, Math.random() * 2, Math.random() - 0.5 );
					mesh.setMatrixAt( i, matrix );
					mesh.setColorAt( i, color.setHex( 0xffffff * Math.random() ) );

				}

				physics.addMesh( mesh, 1 );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.shadowMap.enabled = true;
				renderer.outputEncoding = THREE.sRGBEncoding;
				document.body.appendChild( renderer.domElement );

				stats = new Stats();
				document.body.appendChild( stats.dom );

				//

				var controls = new OrbitControls( camera, renderer.domElement );
				controls.target.y = 0.5;
				controls.update();

			}

			function animate() {

				requestAnimationFrame( animate );

				var mesh = scene.children[ 3 ];
				var index = Math.floor( Math.random() * mesh.count );

				position.set( 0, Math.random() * 2, 0 );
				physics.setMeshPosition( mesh, position, index );

				renderer.render( scene, camera );

				stats.update();

			}

		</script>
	</body>
</html>