Fill a surface of a cube in Psychtoolbox

I have a code written that puts 2 wire frame cubes (in 3D) onto the screen and rotates them, at specific points on the screen using

Screen ('DrawLines',...)

and I want to now turn the cubes (which intentionally warp sometimes) into a solid object with shading cues for the 3D orientation. Does anybody have any idea on how to do this?

Thanks