// Particle3D class

Particle3D = function (material) {

    THREE.Particle.call(this, material);

    //this.material = material instanceof Array ? material : [ material ];

    // define properties
    this.velocity = new THREE.Vector3(0, -8, 0);
    this.velocity.rotateX(randomRange(-45, 45));
    this.velocity.rotateY(randomRange(0, 360));
    this.gravity = new THREE.Vector3(0, 0, 0);
    this.drag = 1;
    // methods... 

};

Particle3D.prototype = new THREE.Particle();
Particle3D.prototype.constructor = Particle3D;

Particle3D.prototype.updatePhysics = function () {

    this.velocity.multiplyScalar(this.drag);
    this.velocity.addSelf(this.gravity);
    this.position.addSelf(this.velocity);

}

var TO_RADIANS = Math.PI / 180;

THREE.Vector3.prototype.rotateY = function (angle) {

    cosRY = Math.cos(angle * TO_RADIANS);
    sinRY = Math.sin(angle * TO_RADIANS);

    var tempz = this.z; ;
    var tempx = this.x;

    this.x = (tempx * cosRY) + (tempz * sinRY);
    this.z = (tempx * -sinRY) + (tempz * cosRY);


}

THREE.Vector3.prototype.rotateX = function (angle) {

    cosRY = Math.cos(angle * TO_RADIANS);
    sinRY = Math.sin(angle * TO_RADIANS);

    var tempz = this.z; ;
    var tempy = this.y;

    this.y = (tempy * cosRY) + (tempz * sinRY);
    this.z = (tempy * -sinRY) + (tempz * cosRY);


}

THREE.Vector3.prototype.rotateZ = function (angle) {

    cosRY = Math.cos(angle * TO_RADIANS);
    sinRY = Math.sin(angle * TO_RADIANS);

    var tempx = this.x; ;
    var tempy = this.y;

    this.y = (tempy * cosRY) + (tempx * sinRY);
    this.x = (tempy * -sinRY) + (tempx * cosRY);


}



// returns a random number between the two limits provided 
function randomRange(min, max) {
    return ((Math.random() * (max - min)) + min);
}