I am getting a distortion with a rigged mesh due to the way that Blender imports FBX files. This is due to some kind of loss of accuracy that occurs while importing the vertex weights.
Here is a blend file with 2 Armatures and meshes.
The mesh on the left was imported via FBX. It appears as if all vertex weights are normalized so that for a given vertex, the weights add up to 1.00.
The mesh on the right was imported via DAE/Collada. The vertex weights appear to be normalized so that for a given vertex, the weights add up to 8.00.
So, are there any 3D file format experts out there that have any ideas on how to deal with this?
Here is a little background on this issue: Both meshes were created from the same Mixamo Fuse character with their auto-rigger. The broken one was imported from FBX, the working one was imported from Collada/DAE. I am in the process of writing some scripts to clean up Mixamo characters imported via FBX, however I am stuck here.