I can't even model an arse properly so "secondary movement" there is no problem :D
I understand what you say about them controlling the vertices that lie along their bone, but what about the vertices around the joint itself? Which joint should "own" the vertices that surround the knee joint? The knee, or the hip? Or half and half?
I understand what you say about them controlling the vertices that lie along their bone, but what about the vertices around the joint itself? Which joint should "own" the vertices that surround the knee joint? The knee, or the hip? Or half and half?