Droid arm IK rig

Hello!

Im trying to create an IK like controller for a droid arm.

I would like to split the rotations to different parts of the shoulder
and make an IK controller or similair.

I did som testing but restricting the axis of the joints and using
an ordinay RPIK solver fails as i suspected it would.

I have always shied away from this kind of setup and reverted to a ballsocket
for the shoulder/hips.
Anyone in here having an idea how to solve something like this?
several ikhandles, aimconstraints, expressions?

I saw an interesting video on an all hinge IK setup:

Grab the Maya file from here if you would like to have a look:

If you are a non Maya user here is an FBX file:

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