My mesh is parented to an armature. But when I rotate the armature upperarm, the mesh's upper arm does not follow the armature fully.

What are the likely causes and how to fix this?

Thank you very much for your help.enter image description here

  • $\begingroup$ You are in weight paint mode, you have to change the mode to pose $\endgroup$ – Rage Jan 22 '19 at 12:33
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    $\begingroup$ could you share your .blend? it would make investigating the problem easier $\endgroup$ – kanuki Jan 22 '19 at 12:52
  • $\begingroup$ Here's my .blend: $\endgroup$ – Karncha P Jan 22 '19 at 14:46
  • $\begingroup$ I tried dragging .blend on Blendexchange, but it wont upload. So, I went to pasteall.org, and got this: pasteall.org/blend/index.php?id=51083 $\endgroup$ – Karncha P Jan 22 '19 at 14:57

It looks like it's a bit messy in your vertex groups and bone weights, for example if I select a group like Chest (which is duplicated by the way), but also some other bones, then press the Select button, I can see that the arms are part of these groups, maybe not enough so I can see it in Weight Paint mode, but enough to have influence on it. So maybe check all your groups, remove these vertices from these groups, or delete some bones and/or weight paint again...

enter image description here

  • $\begingroup$ Thx. I dont know why it happens. I just weight parent normally. This is the 1st time this happens. Is there any easier way to rectify this beside manually dealing with this vertex group? $\endgroup$ – Karncha P Jan 23 '19 at 4:27
  • $\begingroup$ Funny... It is easier to just delete all the vertex groups.. then auto weight parent again. It is all fixed now. Still I do not know what the original cause of this occurance. If anyone has some idea, please suggest. So, we can prevent it from the get-go. Thx~ $\endgroup$ – Karncha P Jan 23 '19 at 6:09

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