backwards solve Neck modular rig is broken

Development Character & Animation
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1

Hey

I’m trying to create a modular rig to clean up mocap animations in Unreal, but the backwards solve isn’t working properly.

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The first character is the skeletal rig with the base animation plus a basic modular rig: with a root, spine, and neck (layered).
The second is just the base animation.
The third is a bake of the animation to the rig.

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I’ve started looking at the module blueprint, but I’m having a hard time debugging it.

Any help is appreciated.

2

Unfortunately it’s not just the neck module where backward solving doesn’t work.

Shoulder and arm modules also don’t backward solve correctly.

Sorry I don’t have a solution for you. I’ve spent so much time trying to get them to work without success.

Wish Epic would fix it.