Exist one doesn’t move head
Video: https://drive.google.com/file/d/1RM5W4aen0HiJqpmfWP6yiaHMy5S-9uL1/view?usp=sharing
So that when the bone turns the head also must turns
Blender project: https://drive.google.com/file/d/1TcJiX2N7iK_e6G54ZoxmBmtakF2zZUQo/view?usp=sharing
I used Mixamo so it changed bones
Here is original project: https://drive.google.com/drive/folders/1MnWMpi-9CXsfRhJ0dvfKhWYSIORnLx--?usp=sharing
It’s pointing forwards (head bones would typically point up), but there is a bone that is a parent to all the other facial bones.
cc_base_facialbone would be a good candidate for the main ‘head’ bone.
The mesh is quite dense, and the head bones aren’t getting auto-weighted to the mesh.
This looks like it was imported from an fbx file. Did the original model have weights already defined? If so, it would be better to leave those untouched, and use the bone weights as-is.
There are other things you’ll want to modify too. The parenting of some of the bones will want to be adjusted (the lower arm doesn’t follow the upper arm, for example).
How to make the head turn with this bone?
All the head area is weighted to the spine_03 bone.
There are a few bones in the head that are probably unnecessary. The model doesn’t have tounge, teeth, or eyes, but there are bones for all of them.
There’s also a gas-mask inside the head which isn’t visible. That will also throw off the auto-weighting algorithm.
Maybe delete all the extras, and only leave the head bone. Then paint the weights to get it to control the head area.
There is an addon that does a better job of weighting teh overlapping mesh areas:
That does tend to blob the fingers together a bit though. So a combination of that to do the main body, then selectively auto-weighting the fingers will do the job.
It will still need a fair bit of clean-up though. Plus any other parenting tweaks, and adding controls to the rig.
This is a good tutorial about importing a game character into Blender, and modifying its rig to make it more usable for animation.
https://www.youtube.com/playlist?list=PLx26dKQzNuzohddKavNbQS22vq52RC-TT
