Scott Robertson has a couple speeded up videos on Rendering on his channel on YouTube. He made a book called rendering showing the methods of using light from the multiple places it comes from and is illuminating your subject. good 3 quarter view. I am working on a design for a larger drawing commission using a Borchart design that never existing into a machine pistol that uses the mechanism that led to the Luger. It is difficult to extrapolate the side, and top into a 3d (orthographic?) on a computer using a drawing tablet instead of on paper like in his drawing book: "How to Draw". This is well done IMHO.