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asked in FullBodyBipedIK by
First off, Final IK is amazing, well worth the money! Good job on such a quality product.

I'm trying to gain more control over the upper body, namely the arms, in FBBIK. Ideally what I want is an elbow effector for position that would also rotate the shoulder to match the effectors rotation. Then I would independently pitch the forearm at the elbow and rotate the hand how I see fit without positional effectors.

I managed to wire in some trigonometry to achieve this, treating the shoulder-elbow-hand as my triangle to solve where I wanted the elbow goal and hand effector, but it all seems a bit much. I tried combinations of CCD chains and FABRIK with root but couldn't affect the rotation of the elbow, and wasn't sure if it was working right.

Now that I think of it, a FABRIK root chain from spine, to clavicle, shoulders, elbows then hands would be nice where I could use rotation limits unlike with FBBIK. But how would I alter rotations of joints so that chains down the line are affected?

Any advice is much appreciated. Thanks!

1 Answer

0 votes
answered by (18.2k points)
Hey and thanks!

FABRIK Root does not work well with animated characters. It is just the nature of the algorithm, FABRIK tends to be a bit snappy if starting from a different pose each frame.

I'm afraid I don't have a good solution for elbow effectors, sorry. You could try changing the References of FBBIK, assign shoulder as upper arm, upper arm as forearm and forearm as hand.

Best,

Pärtel

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