Here is a post by Brisck over on ga that explains how he does it with multiple b&w masks. http://www.gameartisans.org/forums/showpost.php?p=176419&postcount=25 And here is a post by Lamont that explains how he does it with RGB masks grey packed into a single image.…
Thought this post from Behrooz Roozbeh from Naughty Dog would help shed some light on this...it's pretty much what everyone has said up to this point about vertex blending. This comes from the Unhcarted 2 Art Thread on Zbrush Central, check it out here http://www.zbrushcentral.com/showthread.php?t=79141&page=7&pp=15 There…