Skinning problems 2003-12-08 - By Aaron Holly
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Is the character more or less modeled in real-world scale?
Either way, if the rig is being translated over great distances you might
have run into the infamous Maya skinning rounding error!
Here's a test:
(1) Take a poy cube and smooth skin it to a single joint node.
(2) Parent a camera to that joint so that when you translate the joint you
will always have a fixed view of the cube.
(3) Now animate that joint translating, say, 100,00 units over 100 frames.
Interesting result, eh?! ;0)
This effect seems to be amplified as the number of influences increases. One
workaround may be to scale the rig back to its original size; that may
reduce the effect.
Hope this helps out!
-A
>From: "Coony, Ian" <Ian.Coony@(protected)>
>Reply-To: maya@(protected)
>To: maya@(protected)
>Subject: Re: Skinning problems
>Date: Mon, 08 Dec 2003 11:34:28 -0800
>
>Sounds like you have skin weights that don't add up to one (normalized)
>
>Try moving your character way out in space (using your root TRS node)....
>translate and rotate the character something like
>5000x, 5000y, 5000z - and you will quickly see what breaks and where the
>skinvertexes are left behind...
>( this is always a great test to do when you think you have your rig
>working perfectly, as all the flaws quickly show up ;} )
>
>Next, you can use the artisan (paint weights tool) on the skin verts that
>are sticking out.... "smooth" works well if
>you want to average them with the surrounding verts...
>
>another way would be to analyze a vertex close to the "drifters" that
>seemes to be working and apply the same
>weight values it has to the drifter vertex using the component editor to
>manually key in values...
>
>
>I think there is also a script on H3D that will allow you to copy and paste
>weights on a vertex to another vertex...
>this would be the ideal method)
>
>
>good luck,
>
>
>-ian
>
>
>
>
>
>Joey Ponthieux wrote:
> > 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.
> >
> >
> >
> >
>
>--
>-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---
>Ian J. Coony ian.coony@(protected)
>Walt Disney Feature Animation 818.460.8649
>-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---
>
>
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