what happens now is that the cube displays but when i move the camera forward and about 2/3 of the cube is behind me the rest of the cube disappears .
cube= new Cube({material:"blue#black", depth:1000, width:100, height:
100});
cube.x=150;
cube.y=0;
view.scene.addChild(cube);
cube2= new Cube({material:"blue#black", depth:1000,
width:100,
height:100});
cube2.x=150;
cube2.y=0;
cube2.z=1000;
view.scene.addChild(cube2);
