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webgl_points_sprites.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - particles - sprites</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;
}
</style>
</head>
<body>
<div id="info">
<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl particle sprites example -
snowflakes by <a href="http://en.wikipedia.org/wiki/File:Sketch_of_snow_crystal_by_Ren%C3%A9_Descartes.jpg">René Descartes</a>
</div>
<script src="../build/three.js"></script>
<script src="js/WebGL.js"></script>
<script src="js/libs/stats.min.js"></script>
<script src="js/libs/dat.gui.min.js"></script>
<script>
if ( WEBGL.isWebGLAvailable() === false ) {
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
}
var camera, scene, renderer, stats, materials = [], parameters;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 2000 );
camera.position.z = 1000;
scene = new THREE.Scene();
scene.fog = new THREE.FogExp2( 0x000000, 0.0008 );
var geometry = new THREE.BufferGeometry();
var vertices = [];
var textureLoader = new THREE.TextureLoader();
var sprite1 = textureLoader.load( 'textures/sprites/snowflake1.png' );
var sprite2 = textureLoader.load( 'textures/sprites/snowflake2.png' );
var sprite3 = textureLoader.load( 'textures/sprites/snowflake3.png' );
var sprite4 = textureLoader.load( 'textures/sprites/snowflake4.png' );
var sprite5 = textureLoader.load( 'textures/sprites/snowflake5.png' );
for ( var i = 0; i < 10000; i ++ ) {
var x = Math.random() * 2000 - 1000;
var y = Math.random() * 2000 - 1000;
var z = Math.random() * 2000 - 1000;
vertices.push( x, y, z );
}
geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
parameters = [
[[ 1.0, 0.2, 0.5 ], sprite2, 20 ],
[[ 0.95, 0.1, 0.5 ], sprite3, 15 ],
[[ 0.90, 0.05, 0.5 ], sprite1, 10 ],
[[ 0.85, 0, 0.5 ], sprite5, 8 ],
[[ 0.80, 0, 0.5 ], sprite4, 5 ]
];
for ( var i = 0; i < parameters.length; i ++ ) {
var color = parameters[ i ][ 0 ];
var sprite = parameters[ i ][ 1 ];
var size = parameters[ i ][ 2 ];
materials[ i ] = new THREE.PointsMaterial( { size: size, map: sprite, blending: THREE.AdditiveBlending, depthTest: false, transparent: true } );
materials[ i ].color.setHSL( color[ 0 ], color[ 1 ], color[ 2 ] );
var particles = new THREE.Points( geometry, materials[ i ] );
particles.rotation.x = Math.random() * 6;
particles.rotation.y = Math.random() * 6;
particles.rotation.z = Math.random() * 6;
scene.add( particles );
}
//
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
//
stats = new Stats();
document.body.appendChild( stats.dom );
//
var gui = new dat.GUI();
var params = {
texture: true
};
gui.add( params, 'texture' ).onChange( function ( value ) {
for ( var i = 0; i < materials.length; i ++ ) {
materials[ i ].map = ( value === true ) ? parameters[ i ][ 1 ] : null;
materials[ i ].needsUpdate = true;
}
} );
gui.open();
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 );
for ( var i = 0; i < scene.children.length; i ++ ) {
var object = scene.children[ i ];
if ( object instanceof THREE.Points ) {
object.rotation.y = time * ( i < 4 ? i + 1 : - ( i + 1 ) );
}
}
for ( var i = 0; i < materials.length; i ++ ) {
var color = parameters[ i ][ 0 ];
var h = ( 360 * ( color[ 0 ] + time ) % 360 ) / 360;
materials[ i ].color.setHSL( h, color[ 1 ], color[ 2 ] );
}
renderer.render( scene, camera );
}
</script>
</body>
</html>