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 - instanced particles - billboards - colors</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 {
			color: #ffffff;
			font-family: Monospace;
			font-size: 13px;
			text-align: center;
			font-weight: bold;
			background-color: #000000;
			margin: 0px;
			overflow: hidden;
		}

		#info {
			position: absolute;
			top: 0px;
			width: 100%;
			padding: 5px;
		}

		a {
			color: #ffffff;
		}

		#oldie a {
			color: #da0;
		}

		#notSupported {
			width: 50%;
			margin: auto;
			border: 2px red solid;
			margin-top: 20px;
			padding: 10px;
		}
	</style>
</head>
<body>

	<div id="info">
		<a href="http://threejs.org" target="_blank">three.js</a> - instanced circle billboards - colors
		<div id="notSupported" style="display:none">Sorry your graphics card + browser does not support hardware instancing</div>
	</div>

	<script src="../build/three.min.js"></script>
	<script src="js/Detector.js"></script>
	<script src="js/libs/stats.min.js"></script>


	<script id="vshader" type="x-shader/x-vertex">
		precision highp float;
		uniform mat4 modelViewMatrix;
		uniform mat4 projectionMatrix;

		attribute vec3 position;
		attribute vec2 uv;
		attribute vec3 normal;

		attribute vec4 translateScale;
		attribute vec3 color;

		varying vec2 vUv;
		varying vec3 vColor;

		void main()	{

			vec4 positionAdj = vec4( translateScale.xyz, 1.0 );
			vec4 mvPosition = modelViewMatrix * positionAdj;

			mvPosition.xyz += position * translateScale.w;

			vUv = uv;
			vColor = color;

			gl_Position = projectionMatrix * mvPosition;

		}

	</script>
	<script id="fshader" type="x-shader/x-fragment">
		precision highp float;

		uniform sampler2D map;

		varying vec2 vUv;
		varying vec3 vColor;

		void main()	{

			vec4 diffuseColor = texture2D( map, vUv );
			gl_FragColor = vec4( diffuseColor.xyz * vColor, diffuseColor.w );

			if ( diffuseColor.w < 0.5 ) discard; 

		}
	</script>

	<script>

		var container, stats;

		var camera, scene, renderer;
		var particles, geometry, material, sprite;
		var mouseX = 0, mouseY = 0;

		var windowHalfX = window.innerWidth / 2;
		var windowHalfY = window.innerHeight / 2;

		function init() {

			if ( !Detector.webgl ) {

				Detector.addGetWebGLMessage();
				return false;

			}

			renderer = new THREE.WebGLRenderer();

			if ( !renderer.supportsInstancedArrays ) {
				document.getElementById( "notSupported" ).style.display = "";
				return false;
			}

			container = document.createElement( 'div' );
			document.body.appendChild( container );

			camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 3000 );
			camera.position.z = 1400;

			scene = new THREE.Scene();

			geometry = new THREE.InstancedBufferGeometry().copy( new THREE.CircleBufferGeometry( 1, 16 ) );

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

			var particleCount = 5000;

			var translateScaleArray = new Float32Array( 4 * particleCount );
			var colorsArray = new Float32Array( 3 * particleCount );

			var color = new THREE.Color( 0xffffff );
			for ( i = 0, ii = 0, ul = particleCount * 4; i < ul; i += 4, ii += 3 ) {

				translateScaleArray[i] = 2000 * Math.random() - 1000;
				translateScaleArray[i + 1] = 2000 * Math.random() - 1000;
				translateScaleArray[i + 2] = 2000 * Math.random() - 1000;
				translateScaleArray[i + 3] = 24;

				color.setHSL(( translateScaleArray[i] + 1000 ) / 2000, 1, 0.5 );

				colorsArray[ii] = color.r;
				colorsArray[ii + 1] = color.g;
				colorsArray[ii + 2] = color.b;

			}

			geometry.addAttribute( "translateScale", new THREE.InstancedBufferAttribute( translateScaleArray, 4, 1 ) );
			geometry.addAttribute( "color", new THREE.InstancedBufferAttribute( colorsArray, 3, 1 ) );

			material = new THREE.RawShaderMaterial( {
				uniforms: {
					map: { type: "t", value: sprite }
				},
				vertexShader: document.getElementById( 'vshader' ).textContent,
				fragmentShader: document.getElementById( 'fshader' ).textContent,
				depthTest: true,
				depthWrite: true,
				attributes: { 'translateScale': 1, 'color': 2 }

			} );

			scene.add( new THREE.Mesh( geometry, material ) );


			renderer.setPixelRatio( window.devicePixelRatio );
			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 );

			return true;
		}

		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 onWindowResize( event ) {

			windowHalfX = window.innerWidth / 2;
			windowHalfY = window.innerHeight / 2;

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

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

		}

		//

		function animate() {

			requestAnimationFrame( animate );

			render();
			stats.update();

		}

		var lastTime = 0;

		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 );


			renderer.render( scene, camera );

		}

		if ( init() ) {

			animate();

		}
	</script>

</body>
</html>