sparksjs
Version:
Sparks library for three.js with theen.js
441 lines (282 loc) • 11.3 kB
HTML
<html lang="en">
<head>
<title>Sparks.js - three.js webgl particles - WebGL Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;"/>
<style type="text/css">
body {
background-color: #000000;
margin: 0px;
overflow: hidden;
}
a {
color:#0078ff;
}
</style>
</head>
<body>
<!--
<script type="text/javascript" src="https://raw.github.com/zz85/three.js/experimental/build/Three.js"></script>
<script type="text/javascript" src="http://mrdoob.github.com/three.js/examples/js/RequestAnimationFrame.js"></script>
<script type="text/javascript" src="http://mrdoob.github.com/three.js/examples/js/Stats.js"></script>
<script type="text/javascript" src="http://sole.github.com/tween.js/src/Tween.js"></script>
<script type="text/javascript" src="https://raw.github.com/zz85/sparks.js/master/Sparks.js"></script>
-->
<script type="text/javascript" src="js/Three.js"></script>
<script type="text/javascript" src="js/RequestAnimationFrame.js"></script>
<script type="text/javascript" src="js/Stats.js"></script>
<script type="text/javascript" src="js/Tween.js"></script>
<script type="text/javascript" src="../Sparks.js"></script>
<script type="text/javascript" src="js/ShaderExtras.js"></script>
<script type="text/javascript" src="js/postprocessing/EffectComposer.js"></script>
<script type="text/javascript" src="js/postprocessing/RenderPass.js"></script>
<script type="text/javascript" src="js/postprocessing/ShaderPass.js"></script>
<script type="text/javascript" src="js/postprocessing/MaskPass.js"></script>
<script type="text/javascript" src="js/postprocessing/BloomPass.js"></script>
<script type="text/javascript" src="js/postprocessing/FilmPass.js"></script>
<script type="x-shader/x-vertex" id="vertexshader">
attribute float size;
attribute vec4 ca;
varying vec4 vColor;
void main() {
vColor = ca;
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_PointSize = size * ( 150.0 / length( mvPosition.xyz ) );
gl_Position = projectionMatrix * mvPosition;
}
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
uniform vec3 color;
uniform sampler2D texture;
varying vec4 vColor;
uniform float radius;
uniform vec2 delta;
varying vec2 texCoord;
void main() {
vec4 outColor = texture2D( texture, gl_PointCoord );
if ( outColor.a < 0.5 ) discard;
gl_FragColor = outColor * vec4( color * vColor.xyz, 1.0 );
//float depth = gl_FragCoord.z / gl_FragCoord.w;
///const vec3 fogColor = vec3( 0.0 );
//float fogFactor = smoothstep( 200.0, 600.0, depth );
//gl_FragColor = mix( gl_FragColor, vec4( fogColor, gl_FragColor.w ), fogFactor );
}
</script>
<script type="text/javascript">
// Inspired from http://wonderfl.net/c/qTwn and mr doob three.js examples
var container, stats;
var camera, scene, renderer, group, particle;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var lasttime = Date.now(), elapsed;
init();
animate();
var sparksEmitter;
var composer;
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.Camera( 75, window.innerWidth / window.innerHeight, 1, 3000 );
camera.position.z = 200; //1000
scene = new THREE.Scene();
var PI2 = Math.PI * 2;
var particleslength = 10000;
var particles = new THREE.Geometry();
function newpos(x, y, z) {
return new THREE.Vertex(
new THREE.Vector3(x, y, z)
);
}
var Pool = {
__pools: [],
// Get a new Vector
get: function() {
if (this.__pools.length>0) {
return this.__pools.pop();
}
console.log("pool ran out!")
return null;
},
// Release a vector back into the pool
add: function(v) {
this.__pools.push(v);
},
};
for ( i = 0; i < particleslength; i++ ) {
particles.vertices.push(newpos(Math.random() *200 - 100, Math.random() *100+150, Math.random() *50));
Pool.add(i);
}
// Create pools of vectors
attributes = {
size: { type: 'f', value: [] },
ca: { type: 'c', value: [] } //ca //customColor
};
var sprite = generateSprite() ;
textu = new THREE.Texture ( sprite );
textu.needsUpdate = true;
uniforms = {
amplitude: { type: "f", value: 1.0 },
color: { type: "c", value: new THREE.Color( 0xffffff ) },
texture: { type: "t", value: 0, texture:textu} //
//
};
function generateSprite() {
var canvas = document.createElement( 'canvas' );
canvas.width = 128;
canvas.height = 128;
var context = canvas.getContext( '2d' );
context.fillStyle = "white";
context.strokeStyle = "white";
//context.fillRect(0, 0, 128, 128) ;
context.beginPath();
context.arc( 64, 64, 64, 0, PI2, true );
context.closePath();
context.fill();
//context.lineWidth = 0.5; //0.05
//context.stroke();
//context.fill();
//var idata =context.getImageData(0, 0, canvas.width, canvas.height);
//document.body.appendChild(canvas);
return canvas;
}
function generateSprite() {
var canvas = document.createElement( 'canvas' );
canvas.width = 128;
canvas.height = 128;
var context = canvas.getContext( '2d' );
context.beginPath();
context.arc(64, 64, 60, 0, Math.PI*2, false);
context.closePath();
context.lineWidth = 0.5; //0.05
context.stroke();
var gradient = context.createRadialGradient( canvas.width /2, canvas.height /2, 0, canvas.width /2, canvas.height /2, canvas.width /2 );
gradient.addColorStop( 0, 'rgba(255,255,255,1)' );
gradient.addColorStop( 0.2, 'rgba(255,255,255,1)' );
//gradient.addColorStop( 0.6, 'rgba(200,200,200,1)' );
gradient.addColorStop( 0.4, 'rgba(128,128,128,1)' );
gradient.addColorStop( 1, 'rgba(0,0,0,1)' );
context.fillStyle = gradient;
context.fill();
return canvas;
}
var shaderMaterial = new THREE.MeshShaderMaterial( {
uniforms : uniforms,
attributes : attributes,
vertexShader : document.getElementById( 'vertexshader' ).textContent,
fragmentShader : document.getElementById( 'fragmentshader' ).textContent,
blending : THREE.AdditiveBlending,
depthTest : false,
transparent : true
});
group = new THREE.ParticleSystem( particles, shaderMaterial );
group.dynamic = true;
//group.sortParticles = true;
var vertices = group.geometry.vertices;
var values_size = attributes.size.value;
var values_color = attributes.ca.value;
for( var v = 0; v < vertices.length; v++ ) {
values_size[ v ] = 50;
values_color[ v ] = new THREE.Color( 0xaaff00 );
values_color[ v ].setHSV( 0, 0, 0 );
particles.vertices[v].position.set(Number.POSITIVE_INFINITY,Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY);
}
scene.add( group );
renderer = new THREE.WebGLRenderer();
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 );
//// EMITTER STUFF
var h = 0;
var k = 0.7;
// Push indics
var setTargetParticle = function() {
// Find available pool
var target = Pool.get();
//values_size[target] = Math.random() * 20;
values_size[target] = 50+Math.random() * 20;
return target;
};
var onParticleCreated = function(p) {
var target = p.target;
if (target) {
//console.log(target,particles.vertices[target]);
//values_size[target]
//values_color[target]
h += 0.001;
if (h>1) h-=1;
//h = 0.5;
particles.vertices[target].position = p.position;
values_color[target].setHSV(h, 0.8, 0.1); //0.15
};
};
var onParticleDead = function(particle) {
var target = particle.target;
if (target) {
// Hide the particle
values_color[target].setHSV(0, 0, 0);
particles.vertices[target].position.set(Number.POSITIVE_INFINITY,Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY);
// Mark particle system as available by returning to pool
Pool.add(particle.target);
}
};
sparksEmitter = new SPARKS.Emitter(new SPARKS.SteadyCounter(500));
emitterpos = new THREE.Vector3(0,0,0);
var sphereCap = new SPARKS.SphereCapZone(0, 0, 0, 10, 0, 40);
sparksEmitter.addInitializer(new SPARKS.Position( new SPARKS.PointZone( emitterpos ) ) );
sparksEmitter.addInitializer(new SPARKS.Lifetime(0,8));
sparksEmitter.addInitializer(new SPARKS.Target(null, setTargetParticle)); //, setTargetParticle //Pool.get()
sparksEmitter.addInitializer(new SPARKS.Velocity(sphereCap));
sparksEmitter.addAction(new SPARKS.Age());
sparksEmitter.addAction(new SPARKS.Accelerate(0.2));
sparksEmitter.addAction(new SPARKS.Move());
sparksEmitter.addCallback("created", onParticleCreated);
sparksEmitter.addCallback("dead", onParticleDead);
sparksEmitter.start();
}
// End Init
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(time) {
requestAnimationFrame( animate );
render();
stats.update();
}
var _rotation = 0;
function render() {
group.geometry.__dirtyVertices = true;
group.geometry.__dirtyColors = true;
attributes.size.needsUpdate = true;
attributes.ca.needsUpdate = true;
_rotation += 3;
emitterpos.x = 100 * Math.sin(_rotation * SPARKS.Utils.DEGREE_TO_RADIAN);
emitterpos.y = 100 * Math.cos(_rotation * SPARKS.Utils.DEGREE_TO_RADIAN);
renderer.render( scene, camera );
}
</script>
</body>
</html>