How can I modify the human rigify armature or meta-rig to create some helper bones that I can weight-paint to prevent stretching under the armpit?
This is what I have so far with the default rigify human meta-rig with automatic weight-paint applied.
Notice how the section with the black arrow bulges out as I raise the rig’s arm.
I looked at Rain’s rig and noticed that it has three helper bones that I think are weight-painted to help prevent this kind of stretching.
I’ve tried adjusting the weight paint a bit, but the results don’t look great. I’m thinking that adding the extra bones is the best approach.
Are these extra bones created on the meta-rig?
Are there any examples of how these bones are setup or something similar?