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webgl_particles_billboards.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - particles - billboards</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
background-color: #000000;
margin: 0px;
overflow: hidden;
font-family:Monospace;
font-size:13px;
text-align:center;
font-weight: bold;
text-align:center;
}
a {
color:#0078ff;
}
#info {
color:#fff;
position: absolute;
top: 0px; width: 100%;
padding: 5px;
z-index:100;
}
</style>
</head>
<body>
<div id="info">
<a href="http://threejs.org" target="_blank">three.js</a> - webgl particle billboards example
</div>
<script src="../build/three.min.js"></script>
<script src="js/Detector.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var container, stats;
var camera, scene, renderer, particles, geometry, material, i, h, color, sprite, size;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.PerspectiveCamera( 55, window.innerWidth / window.innerHeight, 2, 2000 );
camera.position.z = 1000;
scene = new THREE.Scene();
scene.fog = new THREE.FogExp2( 0x000000, 0.001 );
geometry = new THREE.Geometry();
sprite = THREE.ImageUtils.loadTexture( "textures/sprites/disc.png" );
for ( i = 0; i < 10000; i ++ ) {
var vertex = new THREE.Vector3();
vertex.x = 2000 * Math.random() - 1000;
vertex.y = 2000 * Math.random() - 1000;
vertex.z = 2000 * Math.random() - 1000;
geometry.vertices.push( vertex );
}
material = new THREE.ParticleBasicMaterial( { size: 35, sizeAttenuation: false, map: sprite } );
material.color.setHSV( 1.0, 0.2, 0.8 );
particles = new THREE.ParticleSystem( geometry, material );
particles.sortParticles = true;
scene.add( particles );
//
renderer = new THREE.WebGLRenderer( { clearAlpha: 1 } );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
//
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
//
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onDocumentMouseMove( event ) {
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
function onDocumentTouchStart( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
var time = Date.now() * 0.00005;
camera.position.x += ( mouseX - camera.position.x ) * 0.05;
camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
camera.lookAt( scene.position );
h = ( 360 * ( 1.0 + time ) % 360 ) / 360;
material.color.setHSV( h, 0.75, 0.8 );
renderer.render( scene, camera );
}
</script>
</body>
</html>