Skinning problems 2003-12-08 - By Joey Ponthieux
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Hello,
A number of months ago I rigged, skinned and weighted a male character
to be used as a pilot in an aircraft. At the time I spent days fine
tuning details and testing the rig for appearance. Eventually I finshed
the rig, and exported the rig and skin to be imported in other scene. At
the time everything checked out fine and I was very pleased with it.
Quite a while back I imported the rig into the scene I want it to be
used in. I scaled the rig into it's position in the flightdeck of this
aircraft, and went on to other things. After spending an enournmous
amount of time getting the rest of the flightdeck ready I began
animating and rendering the scene. Now I have discovered that the rig I
created is flawed, if not ruined. I'm not sure whats going on here
exactly, but I have vertices on the mesh drifting away from the basic
shape of the skin, and other parts of the skin exhibit bizarre behavior.
For example if I close the right hand, vertices on the skin of some
digit just fly into space. I have gone back and checked my weighting and
at least visually I can't see any reason for this behavior. To make
matters worse, the entire problem seems to be made worse by the position
of the rig in space. In other words, If I move the aircraft near zero
world space, the rig appears like its supposed and behaves correctly,
but if I move the aircraft 1000, 2000, or 5000 units in space, the
problem steadily gets worse the farther I move the model from world
center. Areas of the face begin getting crumpled, parts of the torso
start to implode, etc. And parts of the rig which ordinarily would
behave properly, start doing weird things. I'm unsure what I've done, I
don't have any time to rebuild this thing, and I suspect it wouldnt make
any difference, since I've gone back and checked the original and it
seems to be fine. After much frustration I have come to the suspicion
that the problems are probably being caused by the resizing and
repositioning of the rig when I imported it into the current scene. I
havent done many character rigs, and to be honest, I don't know what to
do with it at this point. Any thoughts which could shed light on what's
going on here would be greatly apreciated.
--
Joey Ponthieux
NCI Information Systems Inc.
NASA Langley Research Center
__ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __
Opinions stated here-in are strictly those of the author and
do not represent the opinions of NASA or any other party.
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