Here is my model in normal state. No deformations. enter image description here

The second I rotate at this point we get this deformation. No other part of my mesh has this problem. enter image description here

Here is the same mesh but backwards. enter image description here

Here is the weight paint. It's mirrored on the other side. enter image description here

And the geometry if it will help. enter image description here

It looks as if something is stuck there and is causing this problem. looked around the problem area and I can't find any out of place geometry. Any ideas?

Link to the .blend file. http://pasteall.org/blend/32923

  • $\begingroup$ mind uploading your .blend to pasteall.org/blend $\endgroup$ – BlendingJake Nov 16 '14 at 23:56
  • $\begingroup$ Just uploaded it. Added link to post. $\endgroup$ – Andrew Ryan Nov 17 '14 at 21:16
  • $\begingroup$ I'm not seeing the issues that your photos are showing. The worst thing I see is that part of the mesh isn't correctly attached to the bone $\endgroup$ – BlendingJake Nov 17 '14 at 21:36
  • $\begingroup$ That might be the problem. How so? How it's painted? $\endgroup$ – Andrew Ryan Nov 18 '14 at 0:06
  • 1
    $\begingroup$ @BlendingJake: Thank you for the help! Got my problem fixed and fixed what you found. Apparently, ribcage.002 and ribcage.003 had weight paints that were conflicting with one another too much. When rotating ribcage.003, the indent came from ribcage.002 having too much control of that area under the chin. $\endgroup$ – Andrew Ryan Nov 18 '14 at 3:54

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