javascript
/
three.js
zrcadlo https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE HTML>
<html lang="en">
	<head>
		<title>three.js webgl - particles - billboards</title>
		<meta charset="utf-8">
		<style type="text/css">
			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://github.com/mrdoob/three.js" target="_blank">three.js</a> - webgl particle billboards example
		</div>

		<script type="text/javascript" src="../build/Three.js"></script>

		<script type="text/javascript" src="js/Detector.js"></script>
		<script type="text/javascript" src="js/RequestAnimationFrame.js"></script>
		<script type="text/javascript" src="js/Stats.js"></script>

		<script type="text/javascript">

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var container, stats;
			var camera, scene, renderer, particles, geometry, material, i, h, color, sprite, size, x, y, z;
			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.Camera( 55, window.innerWidth / window.innerHeight, 1, 3000 );
				camera.position.z = 1000;

				scene = new THREE.Scene();
				scene.fog = new THREE.FogExp2( 0x000000, 0.001 );

				geometry = new THREE.Geometry();

				sprite = ImageUtils.loadTexture( "textures/sprites/circle.png" );

				for ( i = 0; i < 5000; i++ ) {

					x = 2000 * Math.random() - 1000;
					y = 2000 * Math.random() - 1000;
					z = 2000 * Math.random() - 1000;

					vector = new THREE.Vector3( x, y, z );
					geometry.vertices.push( new THREE.Vertex( vector ) );

				}

				material = new THREE.ParticleBasicMaterial( { size: 35, map: sprite, blending: THREE.BillboardBlending } );
				material.color.setHSV( 1.0, 0.2, 0.8 );

				particles = new THREE.ParticleSystem( geometry, material );
				particles.sortParticles = true;
				particles.updateMatrix();
				scene.addObject( particles );

				var light = new THREE.DirectionalLight( 0xffffff );
				light.position.x = 0;
				light.position.y = 0;
				light.position.z = 1;
				scene.addLight( light );

				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 );

			}

			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 = new Date().getTime() * 0.00005;

				camera.position.x += ( mouseX - camera.position.x ) * 0.05;
				camera.position.y += ( - mouseY - camera.position.y ) * 0.05;

				/*
				for( i = 0; i < scene.objects.length; i++ ) {

					scene.objects[i].rotation.y = 5*time * ( i < 4 ? i+1 : - (i+1) );

				}
				*/

				h = ( 360 * ( 1.0 + time ) % 360 ) / 360;
				material.color.setHSV( h, 0.75, 0.8 );

				renderer.render( scene, camera );

			}

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