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+<!doctype html>
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+<html lang="en">
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+ <head>
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+ <title>three.js webgl - trails</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <style>
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+ body {
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+ background:#000;
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+ padding:0;
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+ margin:0;
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+ font-weight: bold;
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+ overflow:hidden;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+
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+ <script src="../build/Three.js"></script>
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+
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+ <script src="js/RequestAnimationFrame.js"></script>
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+ <script src="js/Stats.js"></script>
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+
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+ <script>
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+
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+ var container, stats;
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+
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+ var camera, scene, renderer;
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+
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+ var mesh, zmesh, lightMesh, geometry;
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+
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+ var mouseX = 0, mouseY = 0;
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+
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+ var windowHalfX = window.innerWidth / 2;
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+ var windowHalfY = window.innerHeight / 2;
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+
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+ document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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+
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+ init();
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+ animate();
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+
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+
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+ function init() {
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+
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+ container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 10000 );
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+ camera.position.x = 100000;
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+ camera.position.z = 3200;
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+
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+ scene = new THREE.Scene();
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+
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+ var colors = [ 0x000000, 0xff0080, 0x8000ff, 0xffffff ];
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+ var geometry = new THREE.Geometry();
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+
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+ for ( var i = 0; i < 2000; i ++ ) {
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+
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+ var vertex = new THREE.Vertex();
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+ vertex.position.x = Math.random() * 4000 - 2000;
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+ vertex.position.y = Math.random() * 4000 - 2000;
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+ vertex.position.z = Math.random() * 4000 - 2000;
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+ geometry.vertices.push( vertex );
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+
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+ geometry.colors.push( new THREE.Color( colors[ Math.floor( Math.random() * colors.length ) ] ) );
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+
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+ }
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+
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+ var material = new THREE.ParticleBasicMaterial( { size: 1, vertexColors: THREE. VertexColors, depthTest: false, opacity: 0.5, sizeAttenuation: false } );
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+
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+ var mesh = new THREE.ParticleSystem( geometry, material );
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+ scene.add( mesh );
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+
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+ renderer = new THREE.WebGLRenderer( { preserveDrawingBuffer: true } );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ renderer.sortObjects = false;
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+ renderer.autoClearColor = false;
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+ container.appendChild( renderer.domElement );
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+
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+ stats = new Stats();
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+ stats.domElement.style.position = 'absolute';
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+ stats.domElement.style.top = '0px';
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+ stats.domElement.style.zIndex = 100;
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+ container.appendChild( stats.domElement );
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+
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+ }
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+
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+ function onDocumentMouseMove(event) {
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+
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+ mouseX = ( event.clientX - windowHalfX ) * 10;
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+ mouseY = ( event.clientY - windowHalfY ) * 10;
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+
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+ }
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+
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+ //
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+
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+ render();
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+ stats.update();
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+
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+ }
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+
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+ function render() {
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+
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+ camera.position.x += ( mouseX - camera.position.x ) * .05;
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+ camera.position.y += ( - mouseY - camera.position.y ) * .05;
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+
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+ camera.lookAt( scene.position );
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+
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Mr.doob