Original animations cannot be seen after retargeting due to euler rotation mode

[robeady]

Scenario

• scene has an armature with an associated animation action. this is the target
• import a source armature which also has animations, and configure the retargeting plugin (bone mappings, rest alignment etc)
• retargeting preview works
• now check "disable drivers"
• retargeting isn't seen any more, but original animation on target skeleton doesn't work any more

looking at the animation in the curve editor it seems like the keyframes are not impacted... they are just not being applied to the armature any more

interestingly, if there are bones not mapped in the plugin, those bones are animated. only the mapped bones don't get animated any more.

my guess is that somehow the plugin overwrites how blender normally applied animation keyframes to the target bones and "disable drivers" does not correctly undo this, but I don't know enough about blender to tell how to solve this problem.

the problem seems to persist after saving and reloading the file.

[robeady]

Ok, I think I figured out the problem. It seems like the plugin changes the rotation mode of every bone to euler angles. this meant I could no longer play animations with quaternion keyframes.

A temporary workaround in my case is, after checking "disable drivers", to enter pose mode, select all bones, press ctrl-r and choose quaternion rotation mode. annoyingly I have to do this every time.

My source armature and animations are also in quaternions in blender, so I guess the plugin is just hardcoded to only support euler rotation mode? maybe a suitable solution would be an option to use quaternions as suggested by #6. I don't know how easy it would be to default to the rotation mode currently in use by the target armature (I guess there is no constraint on rotation mode being the same for the whole armature so maybe this is impractical)

[robeady]

I discovered what seems to be a simpler workaround via the rigify addon. it adds an option "convert rotation modes" to the pose menu that allows you to fix all bone rotation modes and convert the animation keyframes to quaternions