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<!--
Particles.
This example shows using the javascript particle library.
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>
Particles.
</title>
<!-- Include sample javascript library functions-->
<script type="text/javascript" src="o3djs/base.js"></script>
<!-- Our javascript code -->
<script type="text/javascript">
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.particles');
// Events
// init() once the page has finished loading.
// unload() when the page is unloaded.
window.onload = init;
window.onunload= unload;
// global variables
var g_o3d;
var g_math;
var g_client;
var g_viewInfo;
var g_pack;
var g_clock = 0;
var g_timeMult = 1;
var g_finished = false; // for selenium testing
var g_particleSystem;
var g_clockParam;
Creates the client area.
function init() {
o3djs.util.makeClients(initStep2);
}
Initializes O3D and creates one shape.
parameter: {Array} clientElements Array of o3d object elements.
function initStep2(clientElements) {
// Initializes global variables and libraries.
var o3dElement = clientElements[0];
g_o3d = o3dElement.o3d;
g_math = o3djs.math;
g_client = o3dElement.client;
// Creates a pack to manage our resources/assets
g_pack = g_client.createPack();
g_viewInfo = o3djs.rendergraph.createBasicView(
g_pack,
g_client.root,
g_client.renderGraphRoot);
g_viewInfo.drawContext.projection = g_math.matrix4.perspective(
g_math.degToRad(30), // 30 degree fov.
g_client.width / g_client.height,
0.1, // Near plane.
5000); // Far plane.
g_viewInfo.drawContext.view = g_math.matrix4.lookAt(
[500, 1000, 1000], // eye
[0, 200, 0], // target
[0, 1, 0]); // up
// Load our texture. This happens asynchronously.
var url = o3djs.util.getAbsoluteURI('assets/particle-anim.png');
o3djs.io.loadTexture(g_pack, url, initStep3);
}
function initStep3(texture, exception) {
if (exception) {
alert(exception);
return;
}
var paramObject = g_pack.createObject('ParamObject');
g_clockParam = paramObject.createParam('clock', 'ParamFloat');
g_particleSystem = o3djs.particles.createParticleSystem(g_pack,
g_viewInfo,
g_clockParam);
setupFlame();
setupNaturalGasFlame();
setupSmoke();
setupWhiteEnergy();
setupGoogle();
setupRain();
setupAnim(texture);
// Setup an onrender callback for animation.
g_client.setRenderCallback(onrender);
g_finished = true; // for selenium testing.
}
function setupFlame() {
var transform = g_pack.createObject('Transform');
transform.parent = g_client.root;
transform.translate(-300, 0, 0);
var emitter = g_particleSystem.createParticleEmitter();
emitter.setState(o3djs.particles.ParticleStateIds.ADD);
emitter.setColorRamp(
[1, 1, 0, 1,
1, 0, 0, 1,
0, 0, 0, 1,
0, 0, 0, 0.5,
0, 0, 0, 0]);
emitter.setParameters({
numParticles: 20,
lifeTime: 2,
timeRange: 2,
startSize: 50,
endSize: 90,
velocity:[0, 60, 0], velocityRange: [15, 15, 15],
worldAcceleration: [0, -20, 0],
spinSpeedRange: 4});
transform.addShape(emitter.shape);
}
function setupNaturalGasFlame() {
var transform = g_pack.createObject('Transform');
transform.parent = g_client.root;
transform.translate(-200, 0, 0);
var emitter = g_particleSystem.createParticleEmitter();
emitter.setState(o3djs.particles.ParticleStateIds.ADD);
emitter.setColorRamp(
[0.2, 0.2, 1, 1,
0, 0, 1, 1,
0, 0, 1, 0.5,
0, 0, 1, 0]);
emitter.setParameters({
numParticles: 20,
lifeTime: 2,
timeRange: 2,
startSize: 50,
endSize: 20,
velocity:[0, 60, 0],
worldAcceleration: [0, -20, 0],
spinSpeedRange: 4});
transform.addShape(emitter.shape);
}
function setupSmoke() {
var transform = g_pack.createObject('Transform');
transform.parent = g_client.root;
transform.translate(-100, 0, 0);
var emitter = g_particleSystem.createParticleEmitter();
emitter.setState(o3djs.particles.ParticleStateIds.BLEND);
emitter.setColorRamp(
[0, 0, 0, 1,
0, 0, 0, 0]);
emitter.setParameters({
numParticles: 20,
lifeTime: 2,
timeRange: 2,
startSize: 100,
endSize: 150,
velocity: [0, 200, 0], velocityRange: [20, 0, 20],
worldAcceleration: [0, -25, 0],
spinSpeedRange: 4});
transform.addShape(emitter.shape);
}
function setupWhiteEnergy() {
var transform = g_pack.createObject('Transform');
transform.parent = g_client.root;
transform.translate(0, 0, 0);
var emitter = g_particleSystem.createParticleEmitter();
emitter.setState(o3djs.particles.ParticleStateIds.ADD);
emitter.setColorRamp(
[1, 1, 1, 1,
1, 1, 1, 0]);
emitter.setParameters({
numParticles: 80,
lifeTime: 2,
timeRange: 2,
startSize: 100,
endSize: 100,
positionRange: [100, 0, 100],
velocityRange: [20, 0, 20]});
transform.addShape(emitter.shape);
}
function setupGoogle() {
var image = [
'.XXXX...XXXXX...XXXXX.',
'X....X.......X..X....X',
'X....X...XXXXX..X....X',
'X....X.......X..X....X',
'.XXXX...XXXXX...XXXXX.'];
var height = image.length;
var width = image[0].length;
// Make an array of positions based on the text image.
var positions = [];
for (var yy = 0; yy < height; ++yy) {
for (var xx = 0; xx < width; ++xx) {
if (image[yy].substring(xx, xx + 1) == 'X') {
positions.push([(xx - width * 0.5) * 10,
-(yy - height * 0.5) * 10]);
}
}
}
var transform = g_pack.createObject('Transform');
transform.parent = g_client.root;
transform.translate(100, 400, 0);
var emitter = g_particleSystem.createParticleEmitter();
emitter.setState(o3djs.particles.ParticleStateIds.ADD);
emitter.setColorRamp(
[1, 0, 0, 1,
0, 1, 0, 1,
0, 0, 1, 1,
1, 1, 0, 0]);
emitter.setParameters({
numParticles: positions.length * 4,
lifeTime: 2,
timeRange: 2,
startSize: 25,
endSize: 50,
positionRange: [2, 0, 2],
velocity: [1, 0, 1]},
function(particleIndex, parameters) {
//var index = particleIndex;
var index = Math.floor(Math.random() * positions.length);
index = Math.min(index, positions.length - 1);
parameters.position[0] = positions[index][0];
parameters.position[1] = positions[index][1];
});
transform.addShape(emitter.shape);
}
function setupRain() {
var transform = g_pack.createObject('Transform');
transform.parent = g_client.root;
transform.translate(200, 200, 0);
var emitter = g_particleSystem.createParticleEmitter();
emitter.setState(o3djs.particles.ParticleStateIds.BLEND);
emitter.setColorRamp(
[0.2, 0.2, 1, 1]);
emitter.setParameters({
numParticles: 80,
lifeTime: 2,
timeRange: 2,
startSize: 5,
endSize: 5,
positionRange: [100, 0, 100],
velocity: [0,-150,0]});
transform.addShape(emitter.shape);
}
function setupAnim(texture) {
var transform = g_pack.createObject('Transform');
transform.parent = g_client.root;
transform.translate(300, 0, 0);
var emitter = g_particleSystem.createParticleEmitter(texture);
emitter.setColorRamp(
[1, 1, 1, 1,
1, 1, 1, 1,
1, 1, 1, 0]);
emitter.setParameters({
numParticles: 20,
numFrames: 8,
frameDuration: 0.25,
frameStartRange: 8,
lifeTime: 2,
timeRange: 2,
startSize: 50,
endSize: 90,
positionRange: [10, 10, 10],
velocity:[0, 200, 0], velocityRange: [75, 15, 75],
acceleration: [0, -150, 0],
spinSpeedRange: 1});
transform.addShape(emitter.shape);
}
Called every frame.
parameter: {!o3d.RenderEvent} renderEvent Rendering Information.
function onrender(renderEvent) {
var elapsedTime = renderEvent.elapsedTime;
g_clock += elapsedTime * g_timeMult;
g_clockParam.value = g_clock;
}
Remove any callbacks so they don't get called after the page has unloaded.
function unload() {
if (g_client) {
g_client.cleanup();
}
}
</script>
</head>
<body>
<h1>Particles</h1>
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 800px; height: 600px;"></div>
<!-- End of O3D plugin -->
</body>
</html>
(C) Æliens
20/2/2008
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
