threex
Version:
Game Extensions for three.js http://www.threejsgames.com/extensions/
116 lines (107 loc) • 3.64 kB
HTML
<!DOCTYPE html>
<script src="../../../vendor/three.js/build/three.min.js"></script>
<body style='margin: 0px; background-color: #bbb; overflow: hidden;'><script>
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
var updateFcts = [];
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000 );
camera.position.z = 3;
// emit 3 puff every seconds
var emitter = new SphericalBlastEmitter(scene);
updateFcts.push(function(delta, now){
emitter.update(delta, now)
})
setInterval(function(){
var position = new THREE.Vector3(0,-1,-2)
emitter.emit(position);
// emitter.emit(position);
// emitter.emit(position);
}, 5*1000);
//////////////////////////////////////////////////////////////////////////////////
// render the scene //
//////////////////////////////////////////////////////////////////////////////////
updateFcts.push(function(){
renderer.render( scene, camera );
})
//////////////////////////////////////////////////////////////////////////////////
// loop runner //
//////////////////////////////////////////////////////////////////////////////////
var lastTimeMsec= null
requestAnimationFrame(function animate(nowMsec){
// keep looping
requestAnimationFrame( animate );
// measure time
lastTimeMsec = lastTimeMsec || nowMsec-1000/60
var deltaMsec = Math.min(200, nowMsec - lastTimeMsec)
lastTimeMsec = nowMsec
// call each update function
updateFcts.forEach(function(updateFn){
updateFn(deltaMsec/1000, nowMsec/1000)
})
})
//////////////////////////////////////////////////////////////////////////////////
// comment //
//////////////////////////////////////////////////////////////////////////////////
function SphericalBlastEmitter(container){
// load the texture
var texture = THREE.ImageUtils.loadTexture('images/cloud10.png')
var updateFcts = []
this.emit = function(position){
// randomize the initial position
position = position.clone()
// build mesh
var material = new THREE.MeshPhongMaterial({
map : texture,
ambient : 'cyan'
})
var geometry = new THREE.SphereGeometry(0.5, 16, 32)
var mesh = new THREE.Mesh(geometry, material)
container.add(mesh)
var maxAge = 3 + Math.random()*0
// init opacity
var age2Opacity = (function(){
var tweenFn = createTweenMidi(maxAge, 0.05*maxAge, 0.3*maxAge)
return function(age){ return 0.2 + tweenFn(age) * 0.5; }
})()
material.opacity= age2Opacity(0)
// init scale
var age2Scale = (function(){
var tweenFn = createTweenMidi(maxAge, 0.1*maxAge, 0.4*maxAge)
return function(age){ return 0.5 + tweenFn(age) * 3; }
})()
mesh.scale.set(1,1,1).multiplyScalar( age2Scale(0) )
// start updating
var birthDate = Date.now()/1000
updateFcts.push(function callback(delta, now){
var age = Date.now()/1000 - birthDate
if( age >= maxAge ){
mesh.parent.remove(mesh)
updateFcts.splice(updateFcts.indexOf(callback),1)
return;
}
// make it grow
mesh.scale.set(1,1,1).multiplyScalar( age2Scale(age) )
// handle opacity
material.opacity= age2Opacity(age)
})
}
this.update = function(delta, now){
updateFcts.forEach(function(updateFct){
updateFct(delta, now)
})
}
function createTweenMidi(maxAge, attackTime, releaseTime){
return function(age){
if( age < attackTime ){
return age / attackTime
}else if( age < maxAge - releaseTime ){
return 1;
}else{
return (maxAge - age) / releaseTime
}
}
}
}
</script></body>