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 webgl - indexed instancing (single box), dynamic updates</title>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
	<link type="text/css" rel="stylesheet" href="main.css">
	<style>
		a {
			color: #08f;
		}
		#notSupported {
			width: 50%;
			margin: auto;
			background-color: #f00;
			margin-top: 20px;
			padding: 10px;
		}
	</style>
</head>
<body>

	<div id="container"></div>
	<div id="info">
		<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - indexed instancing (single box), dynamic updates
		<div id="notSupported" style="display:none">Sorry your graphics card + browser does not support hardware instancing</div>
	</div>

	<script type="module">
		import * as THREE from '../build/three.module.js';

		import Stats from './jsm/libs/stats.module.js';

		var container, stats;
		var camera, scene, renderer, mesh;
		var offsetAttribute, orientationAttribute;

		var instances = 5000;
		var lastTime = 0;

		var moveQ = new THREE.Quaternion( 0.5, 0.5, 0.5, 0.0 ).normalize();
		var tmpQ = new THREE.Quaternion();
		var tmpM = new THREE.Matrix4();
		var currentM = new THREE.Matrix4();

		init();
		animate();

		function init() {

			container = document.getElementById( 'container' );

			camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );

			scene = new THREE.Scene();
			scene.background = new THREE.Color( 0x101010 );

			// geometry

			var bufferGeometry = new THREE.BoxBufferGeometry( 2, 2, 2 );

			// copying data from a simple box geometry, but you can specify a custom geometry if you want

			var geometry = new THREE.InstancedBufferGeometry();
			geometry.setIndex( bufferGeometry.index );
			geometry.setAttribute( 'position', bufferGeometry.attributes.position );
			geometry.setAttribute( 'uv', bufferGeometry.attributes.uv );

			// material

			var material = new THREE.MeshBasicMaterial();
			material.map = new THREE.TextureLoader().load( 'textures/crate.gif' );

			// per instance data

			var matrix = new THREE.Matrix4();
			var offset = new THREE.Vector3();
			var orientation = new THREE.Quaternion();
			var scale = new THREE.Vector3( 1, 1, 1 );
			var x, y, z, w;

			mesh = new THREE.InstancedMesh( geometry, material, instances );

			for ( var i = 0; i < instances; i ++ ) {

				// offsets

				x = Math.random() * 100 - 50;
				y = Math.random() * 100 - 50;
				z = Math.random() * 100 - 50;

				offset.set( x, y, z ).normalize();
				offset.multiplyScalar( 5 ); // move out at least 5 units from center in current direction
				offset.set( x + offset.x, y + offset.y, z + offset.z );

				// orientations

				x = Math.random() * 2 - 1;
				y = Math.random() * 2 - 1;
				z = Math.random() * 2 - 1;
				w = Math.random() * 2 - 1;

				orientation.set( x, y, z, w ).normalize();

				matrix.compose( offset, orientation, scale );

				mesh.setMatrixAt( i, matrix );

			}

			scene.add( mesh );

			renderer = new THREE.WebGLRenderer();
			renderer.setPixelRatio( window.devicePixelRatio );
			renderer.setSize( window.innerWidth, window.innerHeight );
			container.appendChild( renderer.domElement );

			if ( renderer.extensions.get( 'ANGLE_instanced_arrays' ) === null ) {

				document.getElementById( 'notSupported' ).style.display = '';
				return;

			}

			stats = new Stats();
			container.appendChild( stats.dom );

			window.addEventListener( 'resize', onWindowResize, false );

		}

		function onWindowResize() {

			camera.aspect = window.innerWidth / window.innerHeight;
			camera.updateProjectionMatrix();

			renderer.setSize( window.innerWidth, window.innerHeight );

		}

		//

		function animate() {

			requestAnimationFrame( animate );

			render();
			stats.update();

		}

		function render() {

			var time = performance.now();

			mesh.rotation.y = time * 0.00005;

			var delta = ( time - lastTime ) / 5000;
			tmpQ.set( moveQ.x * delta, moveQ.y * delta, moveQ.z * delta, 1 ).normalize();
			tmpM.makeRotationFromQuaternion( tmpQ );

			for ( var i = 0, il = instances; i < il; i ++ ) {

				mesh.getMatrixAt( i, currentM );
				currentM.multiply( tmpM );
				mesh.setMatrixAt( i, currentM );

			}

			mesh.instanceMatrix.needsUpdate = true;

			lastTime = time;

			renderer.render( scene, camera );

		}

	</script>

</body>


</html>