3d design in some old masters paintings

I have been meaning to play with diagrams of the big 3d sweeps of form in certain old masters figure groups, as this feels to me like a recurring theme in what I am drawn to.

I am also playing with digital painting as a design tool and maybe in the future even a tool for finished work.

So here are some digital analyses of figure groups by Leonardo, Michelangelo, Rubens and Gericault.