this.vectors[7] = new Vector(-this.length/2 , this.length/2 , -this.length/2);
},
_draw:function(){
this.faces[0] = new Face(this.vectors[0] , this.vectors[1] , this.vectors[3] , this.vectors[2] , "#6c6");
this.faces[1] = new Face(this.vectors[2] , this.vectors[3] , this.vectors[5] , this.vectors[4] , "#6cc");
this.faces[2] = new Face(this.vectors[4] , this.vectors[5] , this.vectors[7] , this.vectors[6] , "#cc6");
this.faces[3] = new Face(this.vectors[6] , this.vectors[7] , this.vectors[1] , this.vectors[0] , "#c6c");
this.faces[4] = new Face(this.vectors[1] , this.vectors[3] , this.vectors[5] , this.vectors[7] , "#666");
this.faces[5] = new Face(this.vectors[0] , this.vectors[2] , this.vectors[4] , this.vectors[6] , "#ccc");
this.faces.sort(function(a , b){
return b.zIndex - a.zIndex;
});
this.faces.foreach(function(){
this.draw();
})