Rotate Wrist and Have Forearm Twist Automatically (CAT Rig)

itsWooki — Sun, 25 Aug 2019 16:48:03 GMT

I am rigging the wrist and forearm area of my CAT rig character and discovered that I want a way to "twist" the forearm when I rotate the wrist. Adding multiple bones in the forearm instead of having just one works well (See Image 1), but going in by hand and rotating each of the forearm bones all the time is impractical.

So, What I am looking for is this:

When I rotate the wrist/palm bone, I want the multiple forearm bones to rotate with it automatically, along just the one axis. Additionally, to create the desired "twisting" effect, I want each bone in the forearm to rotate a certain weight/percentage of the palm bone rotation, where the forearm bone closest to the palm bone rotates almost as much as the palm bone, and the forearm bone closest to the elbow barely rotates at all (See Image 2).

After watching/reading some tutorials, I am assuming to pull this off would require the use of the Wire Parameter stuff. If anybody knows how to go about this and is willing to help me out, it'd be greatly appreciated!

Re: Rotate Wrist and Have Forearm Twist Automatically (CAT Rig)

Anonymous — Sun, 25 Aug 2019 17:02:31 GMT

CAT does this automatically for you if you select the Forearm, go to the Modifiy Panel and increase the Segments in the Bones Setup Rollout:

Re: Rotate Wrist and Have Forearm Twist Automatically (CAT Rig)

itsWooki — Sun, 25 Aug 2019 17:05:08 GMT

WOW lol. Hadn't even thought of that. Thank you!

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Rotate Wrist and Have Forearm Twist Automatically (CAT Rig)

Re: Rotate Wrist and Have Forearm Twist Automatically (CAT Rig)

Re: Rotate Wrist and Have Forearm Twist Automatically (CAT Rig)