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Mad Vertex!


Rusalka Writer
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I have an uncontrollable vertex. I know it's not something one likes to admit...

About a year ago I made a simple humanoid avatar to experiment with (under 2500 vertices). I made several other avatars based on this basic humanoid and never had a problem with them. All vertices behaved themselves.

Well, I recently reanimated these avatars from inventory and uploaded them. All were fine, with the exception of a single vertex. One vertex in the front of the thigh of each of these avatars seems to be attracted to the opposite leg (or arm, or eye, or whatever— it seems to be the twin vertex in the opposite thigh to me).

No amount of reassigning, selecting groups, or re-painting fixes this. The problem is absolutely invisible in Blender (2.49). Yet it always appears when I upload these avatars.

The corker? In some avatars it's in the right thigh, in others it's in the left.

Maybe I'll just wait for another viewer. Or totally delete the vertices one-by-one until I find the problem. Really looking forward to that.

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I have had this happen to me at times and it is maddening. You may have already done this, but I recommend doing it again just in case you missed something.

If the mad vertex is on say the right thigh, go through all the joint groups for the left side of the body, one by one and make sure that the vertex is not assigned to one of those.

Now, decided what group on the right the vertex should belong to and make sure it is assigned to that group. I have had spikes appear when I have accidentally ended up with some vertices not assigned to any group.

I apologize if I am telling you something you have already tried several times.

I met an avatar in world, might have been Linkin Slate, not sure, who had the same problem with a vertex on his ankle. He said there was a bug with LODs in rigged mesh that can cause this. I have not encountered the bug and don't know anymore than that about it. Perhaps someone reading this might know more.

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While it seems like common knowledge to me, a part of all rigging is testing your avatar in wacky poses.  Make them do the splits, the wave, touch their toes, etc.  Multiple poses is best (saved animation frames in different poses) and then just cycle through each pose to determine if there are any loose vertices (or any weighting that could be fixed up).  If everything looks fine at every LoD level with each pose, you're looking at some kind of mutant vertex or a bug that should probably be reported.

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This won't help much but I've spent 2 entire days trying to solve the same exact problem, for 2 vertices on the inside on the left thigh behaving as if they were assigned to the right thigh.

Been back to rigged meshes only a couple weeks ago, so I'm  not sure how far back the issue arised; I first had that happen on simple test exports of the base avatar from Domino Marama's avatar blend file. But I've build a new body from scratch and the same thing is happening in the same area, double checked and rebuilt the part with no luck. The weights there are 100% left hip, no stray vertex group, no unassigned duplicates - I'm at a loss.

I tried different export options, included the skeleton, no luck :/

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I had this problem appear a couple of times: I think it might be a bug with blender losing weight data for those vertices, and there after unable to assign a  new weight.

One way to fix an "mad vertex" in blender is to find it, and then replace it. It shouldn be much of a problem to patch it back up on the UV map or on the mesh it self.

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