// Particle3D class

Particle3D = function (material ) {

	THREE.Particle.call( this );
	
	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.update = 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); 
}