<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - buffer geometry custom attributes - particles</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;
background-color: #000000;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px;
width: 100%;
padding: 5px;
font-family: Monospace;
font-size: 13px;
text-align: center;
font-weight: bold;
}
a {
color: #fff;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info"><a href="http://threejs.org" target="_blank">three.js</a> webgl - buffergeometry custom attributes - particles</div>
<script src="../build/three.min.js"></script>
<script src="js/Detector.js"></script>
<script src="js/libs/stats.min.js"></script>
<script type="x-shader/x-vertex" id="vertexshader">
attribute float size;
attribute vec3 customColor;
varying vec3 vColor;
void main() {
vColor = customColor;
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_PointSize = size * ( 300.0 / length( mvPosition.xyz ) );
gl_Position = projectionMatrix * mvPosition;
}
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
uniform vec3 color;
uniform sampler2D texture;
varying vec3 vColor;
void main() {
gl_FragColor = vec4( color * vColor, 1.0 );
gl_FragColor = gl_FragColor * texture2D( texture, gl_PointCoord );
}
</script>
<script>
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var renderer, scene, camera, stats;
var particleSystem, uniforms, geometry;
var particles = 100000;
var WIDTH = window.innerWidth;
var HEIGHT = window.innerHeight;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 40, WIDTH / HEIGHT, 1, 10000 );
camera.position.z = 300;
scene = new THREE.Scene();
var attributes = {
size: { type: 'f', value: null },
customColor: { type: 'c', value: null }
};
uniforms = {
color: { type: "c", value: new THREE.Color( 0xffffff ) },
texture: { type: "t", value: THREE.ImageUtils.loadTexture( "textures/sprites/spark1.png" ) }
};
var shaderMaterial = new THREE.ShaderMaterial( {
uniforms: uniforms,
attributes: attributes,
vertexShader: document.getElementById( 'vertexshader' ).textContent,
fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
blending: THREE.AdditiveBlending,
depthTest: false,
transparent: true
});
var radius = 200;
geometry = new THREE.BufferGeometry();
var positions = new Float32Array( particles * 3 );
var values_color = new Float32Array( particles * 3 );
var values_size = new Float32Array( particles );
var color = new THREE.Color();
for( var v = 0; v < particles; v++ ) {
values_size[ v ] = 20;
positions[ v * 3 + 0 ] = ( Math.random() * 2 - 1 ) * radius;
positions[ v * 3 + 1 ] = ( Math.random() * 2 - 1 ) * radius;
positions[ v * 3 + 2 ] = ( Math.random() * 2 - 1 ) * radius;
color.setHSL( v / particles, 1.0, 0.5 );
values_color[ v * 3 + 0 ] = color.r;
values_color[ v * 3 + 1 ] = color.g;
values_color[ v * 3 + 2 ] = color.b;
}
geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
geometry.addAttribute( 'customColor', new THREE.BufferAttribute( values_color, 3 ) );
geometry.addAttribute( 'size', new THREE.BufferAttribute( values_size, 1 ) );
particleSystem = new THREE.PointCloud( geometry, shaderMaterial );
scene.add( particleSystem );
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( WIDTH, HEIGHT );
var container = document.getElementById( 'container' );
container.appendChild( renderer.domElement );
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
//
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 = Date.now() * 0.005;
particleSystem.rotation.z = 0.01 * time;
var size = geometry.attributes.size.array;
for( var i = 0; i < particles; i++ ) {
size[ i ] = 10 * ( 1 + Math.sin( 0.1 * i + time ) );
}
geometry.attributes.size.needsUpdate = true;
renderer.render( scene, camera );
}
</script>
</body>
</html>