I came across a problem.
I made a very basic box character to test this out. I imported the mannequin skeleton into blender, made a copy of it. Then I adjusted the bones of the copy so it fits my box character. I didnt had much weight painting correction to do since the auto weight was almost perfect. Everything moved smoothly with the copied armature.
Then I right clicked the mesh and selected > Parent > Clear Parent. Now my copied skeleton didnt move the mesh as expected. But, when I parented the mesh with the first unmodified mannequin skeleton, the mesh moved with the pivot points of the new parent skeleton, and didnt work as intended. I even tried every parenting options just for the heck of it.
The weight seemed alright for the mesh, the right parts moved for each bone I rotated in pose mode, but like I said, the pivot points are from the new skeleton. Lets say, when I move the elbow, it doesnt rotate from the center but from an exterior point (where the unmodified skeleton’s elbow is located).
What should I do about that ?