IK Retargeting 2 bones to 4 bones on a limb

I’m encountering an issue while attempting to retarget animations to a character. The source character’s skeleton features two bones each for the thigh and shin, as well as two bones for the arm and forearm. However, the target skeleton I am working with has three bones for the legs (thigh-bend, thigh-twist, and shin) and four bones for the arms (arm-bend, arm-twist, forearm-bend, and forearm-twist).

When I try to retarget the animations, the legs and arms behave incorrectly, bending unnaturally as if they were a ‘tail,’ which completely breaks the intended motion.

I’ve attempted to resolve this by removing the twist bones from the solver in the IK Retargeter window.


While this seems to work when previewing the IK retargeting, the issue persists when I proceed to retarget the animation itself—as though the twist bones were never marked for removal in the first place:

This is specifically frustrating because on the documentation I was reading here, they are saying that there’s a specific way to solve my exact same issue but they never really explain step by step how:

Could anyone advise on how to resolve this issue?

Update:
I managed to find a solution by using the “Pin bones” tab in the retargeted window, this is making so the bones I don’t want to move are being pinned to their rotation:

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