Added coffee version of bkcore.threejs.Particles
This commit is contained in:
BKcore
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###
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Particle system wrapper/helper
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@class bkcore.threejs.Particles
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@author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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###
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class Particles
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###
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Creates a new particle system using given parameters
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@param {Object{max, spawnRate, spawn, velocity, randomness,
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force, spawnRadius, life, friction, color, color2, tint,
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texture, size, blending, depthTest, transparent, opacity}} opts
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###
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constructor: (opts)->
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@black = new THREE.Color(0x000000)
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@white = new THREE.Color(0xffffff)
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@material = new THREE.ParticleBasicMaterial(
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color: opts.tint ? 0xffffff
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map: opts.texture ? null
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size: opts.size ? 4
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blending: opts.blending ? THREE.AdditiveBlending
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depthTest: opts.depthTest ? false
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transparent: opts.transparent ? true
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vertexColors: true
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opacity: opts.opacity ? 1.0
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sizeAttenuation: true
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)
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@max = opts.max ? 1000
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@spawnRate = opts.spawnRate ? 0
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@spawn = opts.spawn ? new THREE.Vector3()
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@velocity = opts.velocity ? new THREE.Vector3()
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@randomness = opts.randomness ? new THREE.Vector3()
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@force = opts.force ? new THREE.Vector3()
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@spawnRadius = opts.spawnRadius ? new THREE.Vector3()
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@life = opts.life ? 60
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@ageing = 1 / @life
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@friction = opts.friction ? 1.0
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@color = new THREE.Color(opts.color ? 0xffffff)
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@color2 = if opts.color2? then new THREE.Color(opts.color2) else null
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@position = opts.position ? new THREE.Vector3()
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@rotation = opts.rotation ? new THREE.Vector3()
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@sort = opts.sort ? false
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@pool = []
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@buffer = []
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@geometry = null
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@system = null
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@build()
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###
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Emits given number of particles
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@param int count
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###
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emit: (count)->
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emitable = Math.min(count, @pool.length)
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for i in [0..emitable]
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p = @pool.pop()
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p.available = false
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p.position.copy(@spawn).addSelf(
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@randomVector().multiplySelf(@spawnRadius)
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)
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p.velocity.copy(@velocity).addSelf(
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@randomVector().multiplySelf(@randomness)
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)
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p.force.copy(@force)
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p.basecolor.copy(@color)
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if @color2?
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p.basecolor.lerpSelf(@color2, Math.random())
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p.life = 1.0
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###
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@private
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###
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build: ()->
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@geometry = new THREE.Geometry()
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@geometry.dynamic = true
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@pool = []
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@buffer = []
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for i in [0..@max]
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p = new bkcore.threejs.Particle()
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@pool.push(p)
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@buffer.push(p)
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@geometry.vertices.push(p.position)
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@geometry.colors.push(p.color)
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@system = new THREE.ParticleSystem(@geometry, @material)
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@system.position = @position
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@system.rotation = @rotation
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@system.sort = @sort
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###
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@private
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###
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randomVector: ()->
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return new THREE.Vector3(
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Math.random()*2-1,
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Math.random()*2-1,
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Math.random()*2-1
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)
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###
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Updates particles (should be call in a RAF loop)
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@param float dt time delta ~1.0
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###
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update: (dt)->
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df = new THREE.Vector3()
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dv = new THREE.Vector3()
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for i in [0..@buffer.length]
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p = @buffer[i]
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continue if p.available
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p.life -= @ageing
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if p.life <= 0
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p.reset()
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@pool.push(p)
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continue
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l = if p.life > 0.5 then 1.0 else p.life + 0.5
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p.color.setRGB(
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l * p.basecolor.r,
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l * p.basecolor.g,
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l * p.basecolor.b
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)
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if @friction != 1.0
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p.velocity.multiplyScalar(@friction)
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df.copy(p.force).multiplyScalar(dt)
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p.velocity.addSelf(df)
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dv.copy(p.velocity).multiplyScalar(dt)
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p.position.addSelf(dv)
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if @spawnRate > 0
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@emit(@spawnRate)
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@geometry.verticesNeedUpdate = true
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@geometry.colorsNeedUpdate = true
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###
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Particle sub class
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@class bkcore.threejs.Particle
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@author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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###
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class Particle
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constructor: ()->
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@position = new THREE.Vector3(-10000,-10000,-10000)
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@velocity = new THREE.Vector3()
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@force = new THREE.Vector3()
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@color = new THREE.Color(0x000000)
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@basecolor = new THREE.Color(0x000000)
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@life = 0.0
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@available = true
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reset: ()->
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@position.set(0,-100000,0)
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@velocity.set(0,0,0)
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@force.set(0,0,0)
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@color.setRGB(0,0,0)
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@basecolor.setRGB(0,0,0)
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@life = 0.0
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@available = true
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@@ -0,0 +1,194 @@
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// Generated by CoffeeScript 1.4.0
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/*
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Particle system wrapper/helper
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@class bkcore.threejs.Particles
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@author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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*/
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(function() {
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var Particle, Particles;
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Particles = (function() {
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/*
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Creates a new particle system using given parameters
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@param {Object{max, spawnRate, spawn, velocity, randomness,
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force, spawnRadius, life, friction, color, color2, tint,
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texture, size, blending, depthTest, transparent, opacity}} opts
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*/
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function Particles(opts) {
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var _ref, _ref1, _ref10, _ref11, _ref12, _ref13, _ref14, _ref15, _ref16, _ref17, _ref18, _ref19, _ref2, _ref3, _ref4, _ref5, _ref6, _ref7, _ref8, _ref9;
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this.black = new THREE.Color(0x000000);
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this.white = new THREE.Color(0xffffff);
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this.material = new THREE.ParticleBasicMaterial({
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color: (_ref = opts.tint) != null ? _ref : 0xffffff,
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map: (_ref1 = opts.texture) != null ? _ref1 : null,
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size: (_ref2 = opts.size) != null ? _ref2 : 4,
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blending: (_ref3 = opts.blending) != null ? _ref3 : THREE.AdditiveBlending,
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depthTest: (_ref4 = opts.depthTest) != null ? _ref4 : false,
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transparent: (_ref5 = opts.transparent) != null ? _ref5 : true,
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vertexColors: true,
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opacity: (_ref6 = opts.opacity) != null ? _ref6 : 1.0,
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sizeAttenuation: true
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});
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this.max = (_ref7 = opts.max) != null ? _ref7 : 1000;
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this.spawnRate = (_ref8 = opts.spawnRate) != null ? _ref8 : 0;
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this.spawn = (_ref9 = opts.spawn) != null ? _ref9 : new THREE.Vector3();
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this.velocity = (_ref10 = opts.velocity) != null ? _ref10 : new THREE.Vector3();
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this.randomness = (_ref11 = opts.randomness) != null ? _ref11 : new THREE.Vector3();
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this.force = (_ref12 = opts.force) != null ? _ref12 : new THREE.Vector3();
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this.spawnRadius = (_ref13 = opts.spawnRadius) != null ? _ref13 : new THREE.Vector3();
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this.life = (_ref14 = opts.life) != null ? _ref14 : 60;
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this.ageing = 1 / this.life;
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this.friction = (_ref15 = opts.friction) != null ? _ref15 : 1.0;
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this.color = new THREE.Color((_ref16 = opts.color) != null ? _ref16 : 0xffffff);
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this.color2 = opts.color2 != null ? new THREE.Color(opts.color2) : null;
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this.position = (_ref17 = opts.position) != null ? _ref17 : new THREE.Vector3();
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this.rotation = (_ref18 = opts.rotation) != null ? _ref18 : new THREE.Vector3();
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this.sort = (_ref19 = opts.sort) != null ? _ref19 : false;
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this.pool = [];
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this.buffer = [];
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this.geometry = null;
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this.system = null;
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this.build();
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}
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/*
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Emits given number of particles
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@param int count
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*/
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Particles.prototype.emit = function(count) {
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var emitable, i, p, _i, _results;
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emitable = Math.min(count, this.pool.length);
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_results = [];
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for (i = _i = 0; 0 <= emitable ? _i <= emitable : _i >= emitable; i = 0 <= emitable ? ++_i : --_i) {
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p = this.pool.pop();
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p.available = false;
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p.position.copy(this.spawn).addSelf(this.randomVector().multiplySelf(this.spawnRadius));
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p.velocity.copy(this.velocity).addSelf(this.randomVector().multiplySelf(this.randomness));
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p.force.copy(this.force);
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p.basecolor.copy(this.color);
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if (this.color2 != null) {
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p.basecolor.lerpSelf(this.color2, Math.random());
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}
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_results.push(p.life = 1.0);
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}
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return _results;
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};
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/*
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@private
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*/
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Particles.prototype.build = function() {
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var i, p, _i, _ref;
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this.geometry = new THREE.Geometry();
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this.geometry.dynamic = true;
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this.pool = [];
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this.buffer = [];
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for (i = _i = 0, _ref = this.max; 0 <= _ref ? _i <= _ref : _i >= _ref; i = 0 <= _ref ? ++_i : --_i) {
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p = new bkcore.threejs.Particle();
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this.pool.push(p);
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this.buffer.push(p);
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this.geometry.vertices.push(p.position);
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this.geometry.colors.push(p.color);
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}
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this.system = new THREE.ParticleSystem(this.geometry, this.material);
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this.system.position = this.position;
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this.system.rotation = this.rotation;
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return this.system.sort = this.sort;
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};
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/*
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@private
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*/
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Particles.prototype.randomVector = function() {
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return new THREE.Vector3(Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1);
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};
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/*
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Updates particles (should be call in a RAF loop)
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@param float dt time delta ~1.0
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*/
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Particles.prototype.update = function(dt) {
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var df, dv, i, l, p, _i, _ref;
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df = new THREE.Vector3();
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dv = new THREE.Vector3();
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for (i = _i = 0, _ref = this.buffer.length; 0 <= _ref ? _i <= _ref : _i >= _ref; i = 0 <= _ref ? ++_i : --_i) {
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p = this.buffer[i];
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if (p.available) {
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continue;
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}
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p.life -= this.ageing;
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if (p.life <= 0) {
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p.reset();
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this.pool.push(p);
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continue;
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}
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l = p.life > 0.5 ? 1.0 : p.life + 0.5;
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p.color.setRGB(l * p.basecolor.r, l * p.basecolor.g, l * p.basecolor.b);
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if (this.friction !== 1.0) {
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p.velocity.multiplyScalar(this.friction);
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}
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df.copy(p.force).multiplyScalar(dt);
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p.velocity.addSelf(df);
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dv.copy(p.velocity).multiplyScalar(dt);
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p.position.addSelf(dv);
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}
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if (this.spawnRate > 0) {
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this.emit(this.spawnRate);
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}
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this.geometry.verticesNeedUpdate = true;
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return this.geometry.colorsNeedUpdate = true;
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};
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return Particles;
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})();
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/*
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Particle sub class
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@class bkcore.threejs.Particle
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@author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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*/
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Particle = (function() {
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function Particle() {
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this.position = new THREE.Vector3(-10000, -10000, -10000);
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this.velocity = new THREE.Vector3();
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this.force = new THREE.Vector3();
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this.color = new THREE.Color(0x000000);
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this.basecolor = new THREE.Color(0x000000);
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this.life = 0.0;
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this.available = true;
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}
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Particle.prototype.reset = function() {
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this.position.set(0, -100000, 0);
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this.velocity.set(0, 0, 0);
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this.force.set(0, 0, 0);
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this.color.setRGB(0, 0, 0);
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this.basecolor.setRGB(0, 0, 0);
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this.life = 0.0;
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return this.available = true;
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};
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return Particle;
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})();
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}).call(this);
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