function Light(cen, r, col){
	this.Center = new Vector(cen.x,cen.y,cen.z);
	this.radius = r;
	this.Normal = new Vector(0,0,1);
	this.Color = new RGB(col.r,col.g,col.b);
}
Light.prototype.setCenter = function(src){ this.Center = new Vector(src.x,src.y,src.z); }
Light.prototype.setNormal = function(vect){ (this.Normal = new Vector(vect.x, vect.y, vect.z)).normalize(); }
Light.prototype.getCenter = function(){ return new Vector(this.Center.x, this.Center.y, this.Center.z); }
Light.prototype.getDirection = function(){ return new Vector(this.Normal.x, this.Normal.y, this.Normal.z); }