particle.js

Particle = function(){
    var geom = new THREE.PlaneGeometry(2,2,2,2);
    var mat = new THREE.MeshPhongMaterial({
                                          color:0x009999,
                                          shininess:0,
                                          specular:0xffffff,
                                          shading:THREE.FlatShading
                                          });
    this.mesh = new THREE.Mesh(geom,mat);
}

Particle.prototype.explode = function(pos, color, scale){
    var _this = this;
    var _p = this.mesh.parent;
    this.mesh.material.color = new THREE.Color( color);
    this.mesh.material.needsUpdate = true;
    this.mesh.scale.set(scale, scale, scale);
    var targetX = pos.x + (-1 + Math.random()*2)*50;
    var targetY = pos.y + (-1 + Math.random()*2)*50;
    var speed = .6+Math.random()*.2;
    TweenMax.to(this.mesh.rotation, speed, {x:Math.random()*12, y:Math.random()*12});
    TweenMax.to(this.mesh.scale, speed, {x:.1, y:.1, z:.1});
    TweenMax.to(this.mesh.position, speed, {x:targetX, y:targetY, delay:Math.random() *.1, ease:Power2.easeOut, onComplete:function(){
                if(_p) _p.remove(_this.mesh);
                _this.mesh.scale.set(1,1,1);
                particlesPool.unshift(_this);
                }});
}

ParticlesHolder = function (){
    this.mesh = new THREE.Object3D();
    this.particlesInUse = [];
}

ParticlesHolder.prototype.spawnParticles = function(pos, density, color, scale){
    
    var nPArticles = density;
    for (var i=0; i<nPArticles; i++){
        var particle;
        if (particlesPool.length) {
            particle = particlesPool.pop();
        }else{
            particle = new Particle();
        }
        this.mesh.add(particle.mesh);
        particle.mesh.visible = true;
        var _this = this;
        particle.mesh.position.y = pos.y;
        particle.mesh.position.x = pos.x;
        //particle.mesh.position.z = pos.z;
        particle.explode(pos,color, scale);
    }
}