This is a great idea. I would ask over on Tech-Artists.Org. We had a discussion about this a couple years ago. http://tech-artists.org/forum/showthread.php?t=429
Trying to wrap my head around how the artUserpaintContext works for Maya. Wish I could help on the Max side :( Maybe try and see if anyone has any scripts where they use a brush and hope its not encrypted? What Ben from tech-artists was talking about:…
You could force the Camera perspective to 'Top' so the amount of 'shot' vertices would not be an issue, in some scripts, I noticed a nasty habit of Max shooting through the surface of the mesh and onto other assets in the scene. I remember some guy in Tech Talk topic (the pinned topic up top) made a Fracture/Vornoi scrip…