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DUIK hands/ parented bones always slightly offset?

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Kate Trent
DUIK hands/ parented bones always slightly offset?
on Sep 1, 2016 at 7:30:36 pm

Hi everyone!
I was wondering if someone could help me with a DUIK problem.

I've been making rigid arms with three pieces: Upper arm, lower arm, hand.
I make four bones using DUIK from four pins placed on these, two to each arm respectively, called: Shoulder, Upper Elbow, Lower Elbow, Wrist.

I parent Lower Elbow to Upper Elbow, Upper Elbow to Shoulder and Wrist to Upper Elbow. I put a controller on the Wrist. Then I grab Wrist, Upper Elbow, (leaving out the Lower Elbow), Shoulder and Controller (in that order) and apply 2-layer IK.

This works, mostly, but the parented Elbow joints and the parented hand & wrist joints are always slightly off the higher you lift the arm. This didn't use to happen, and I was wondering if this happens to anyone else and if they have a solution?

I have attached an image of the hand with multiply so you can see how the joint has drifted. I promise I lined all the pins up with precision (with the starting arm in a straight vertical position) !

Thanks so much for your help!

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