it still need a proper Z sorting of faces when moving the cube the occlusion is not finished , still looking for a better way to do that , the faces kinda overlap each other sometimes, and also apply the zsort to all the shapes in the scene, i might improve this code later,... any help is welcome

        " W A S D " to move
        " maintain the Right button of the mouse and move the mouse " to rotate the cube
        " click and maintain the mouse scroll wheel and move the mouse" to move  the camera up and down in scene up and down
        " numpad + and numpad -" to zoom in and out