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I have an object and I added bones to it. It looks like this

enter image description here

I used automatic weights option to calculate the weights. But some of the vertices are not given a weight. When I move the first bone in pose mode it looks like this

enter image description here

I have tried removing parent relationship, deleting vertex groups and recalculating weights but the result is the same. I have no idea what could have caused this or how to fix it. Adding those vertices with vertex paint is not something I want to do unless it is the only choice I have so I am asking for help.

Thanks in advance.

Yunus Burak Durmuş
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  • In edit mode, have you checked that the vertices in question are assigned to the correct vertex group? – Blunder Oct 19 '21 at 17:28
  • @Blunder The said vertices are not in any vertex group – Yunus Burak Durmuş Oct 20 '21 at 06:44
  • Ok, that's the reason why this area doesn't move. I guess there is something wrong with the mesh (duplicated vertices, intersecting mesh?) and it causes the Heat weighting: failed to find solution for one or more bones error. It cancels the weight paint calculation and can result in such a half-working rig. Can you repeat the step (With Automatic Weights) and check if there is a warning for a few seconds in the status bar as you can see here: https://i.stack.imgur.com/QOFup.gif ? – Blunder Oct 20 '21 at 10:47
  • @Blunder I have checked the mesh for duplicate vertices and there are no duplicated vertices. Also the object consists of one mesh not more. I ran automatic weights again as you said after deleting vertex groups and no error message showed up. – Yunus Burak Durmuş Oct 20 '21 at 11:07
  • darn, it was a good possible reason. Can you share the file? – Blunder Oct 20 '21 at 12:26
  • @Blunder Sorry for the late answer. Here is the link to the file https://drive.google.com/file/d/1a8nxWULueEQmDZVDH6VR6KjAKbYrt7jX/view?usp=sharing – Yunus Burak Durmuş Oct 22 '21 at 10:40
  • Thanks for the file. That helped to track the error. The mesh of the leg has flipped normals. The whole mesh is basically inside out. You can check this with the Face Orientation overlay (https://blender.stackexchange.com/q/119408/107598). That's the reason why the With Automatic Weights does not work. Go in Edit, select everything with key A, and then flip the normals Alt+N as described here: https://blender.stackexchange.com/a/167034/107598. (I will mark this question as duplicate) – Blunder Oct 22 '21 at 17:18

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