You answered the question I specifically told you not to worry about. :smile: Which is also useful, don't get me wrong, but I'd prefer to think about it the other way round. Identify the ideal outcome from the user end, then if that can't be achieved in practice, fall back to whatever is left.

Anyway, let's talk about bump maps specifically. I can wire up a bump map so that its strength follows the strength of a specific morph, which is what I'd want to do for things like raised eyebrows. The problem is, what happens when the user loads a new head material? Generally, the old one gets overwritten, so my nice bump map goes bye-bye. How do I prevent that or make it easy to load the bump maps and their wiring on top of an existing material?

-- I'm not mad at you, just Westphalian.