If I understand the question correctly, I think the question is how to remove influence, you can do this with the paint weights tool, at least for smooth bound skins. With skin selected and the paint weights tool active, select the joint you want to change. In the tool attributes make sure the mode in set to "replace" and the value is set to zero.
Please correct me if on wrong, but this seems to do what was requested.
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Last edited by mhcannon : 15-03-2005 at 04:54 PM.