I get that a lot . . .
I should have said "at multiple
points of rotation in the channel". For example, setting up a shin bend. at the extreme, where the calf and the back of the thigh contact, there will be bulging. So, I shape that with a weight map. If that's all I do then I would expect at the halfway point of the rotation, half of the bulge would be visible; a linear interpolation of vertex deltas. That's not natural. Can I rotate the shin until just before the calf and thigh make contact, remove the bulge, and still have everything behave correctly. If you graphed a given vertex's weight-map deltas it would not be linear in that case.
Is that any more clear?
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