threex
Version:
Game Extensions for three.js http://www.threejsgames.com/extensions/
137 lines (125 loc) • 4.18 kB
HTML
<!DOCTYPE html>
<script src="../../../vendor/three.js/build/three.min.js"></script>
<body style='margin: 0px; background-color: lightblue; 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 rainEmitter = new RainEmitter(scene);
updateFcts.push(function(delta, now){
rainEmitter.update(delta, now)
})
var position = new THREE.Vector3(0,3,-5)
var rate = 100
rainEmitter.start(position, rate)
//////////////////////////////////////////////////////////////////////////////////
// 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 RainEmitter(container){
// load the texture
var texture = THREE.ImageUtils.loadTexture('images/stemkoski/snowflake.png')
var updateFcts = []
this.emit = function(position){
// randomize the initial position
position = position.clone()
position.x += (Math.random()-0.5)*10
position.y += (Math.random()-0.5)*0.1
position.z += (Math.random()-0.5)*10
// init sprite material
var material = new THREE.SpriteMaterial({
map : texture,
useScreenCoordinates : false,
color : 'white'
})
// init sprite
var sprite = new THREE.Sprite(material)
sprite.position.copy(position)
sprite.scale.multiplyScalar(1/10)
container.add(sprite)
var angularVelocity = Math.PI/3 * (Math.random()-0.5)
angularVelocity += Math.PI/8 * (Math.random()-0.5)
var maxAge = 8 + (Math.random()-0.5)*1
// set velocity
var velocity = new THREE.Vector3(0, -0.6, 0)
velocity.x += (Math.random()-0.5)*0.3
velocity.y += (Math.random()-0.5)*0.1
velocity.z += (Math.random()-0.5)*0.3
// init opacity
var age2Opacity = createTweenMidi(maxAge, 0.05*maxAge, 0.05*maxAge)
material.opacity= age2Opacity(0)
var birthDate = Date.now()/1000
updateFcts.push(function callback(delta, now){
var age = Date.now()/1000 - birthDate
if( age >= maxAge ){
sprite.parent.remove(sprite)
updateFcts.splice(updateFcts.indexOf(callback),1)
return;
}
// move by velocity
sprite.position.add( velocity.clone().multiplyScalar(delta) )
// handle opacity
material.opacity= age2Opacity(age)
// handle angularVelocity
sprite.rotation += angularVelocity*delta;
})
}
var _loopCb = null;
this.start = function(position, rate){
var nToEmit = 1
updateFcts.push(_loopCb = function(delta, now){
nToEmit += rate * delta;
// rate limiter emition
for(; nToEmit >= 1; nToEmit--){
this.emit(position)
}
}.bind(this))
return this;
}
this.stop = function(){
updateFcts.splice(updateFcts.indexOf(_loopCb),1)
return this;
}
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>