HumanGen has a problem with its Rigify rig. The arms don't work properly.

To work around this issue I do the following:

  1. Use the HumanGen face mesh because it has better textures
  2. Use the MB-Lab body because it has a better rig and better proxy system
  3. Generate the humangen face rig
  4. Delete the humangen body bones leaving the neck and above
  5. Add an MB-Lab model and finalize it
  6. Add an MB-Lab Rigify using the Rigify-for-MB-Lab model. Note you'll need to use Blender 3.6 to do that since the add-on doesn't support bone collections yet.
  7. Add a copy transform constraint on the human gen neck and head bones and get them to follow the MB-Lab Rigify neck and head bones
  8. Disable the copy tranforms on the bones above and add the face it rig. This is needed in order for the binding to work properly.
  9. Make sure the faceit rig is the top of the modifier stack
  10. Make sure to remove the single pixel in  lip_lower_vg_b from the lip and jaw vertex groups because that single pixel is used to move the lower teeth.
  11. Re-enable the copy transforms and everything should work correctly
  12. You can then add a set of clothes using MB-Lab's tools


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