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View Full Version : Hand rigging - strange axis rotation

gopherCG
07-19-2003, 05:22 PM
Hi, I'm rigging a cartoon hand with normal five fingers.
Here are my steps for rigging:
limb bones created, last bone is the palm bone -> limb in 45 degrees slanting down posture.

one finger bones created, also in slanted fashion.

copied the finger for the rest -> I rotated each of them to fit the natural bent gesture of a real hand.

thumb made individually

Linked fingers to palm bone

created HI solver for each finger
------
Now the problem is the bone rotational axis don't follow the local axis of each bone, rather, they seem to follow the world axis. So changing the xyz angle options under Rotational Joints produce strange results.
I tested with other clean setups and the IK show the same prob.
Did I do sth wrong in my steps? or is this a bug of Max 4?

sample bones file (try adding HI IK to fingers and see what happens)
pluMmet
07-19-2003, 06:11 PM
Wireing paramiters works best for hands...

my Spelling looks off , I'm so tired:D
thorn3d
07-20-2003, 10:07 PM
Plummet is correct. I've never used IK for fingers, and given the other options I'm not sure why you'd want to. It's much easier to use parameter wiring to link each finger joint to it's parent, then have them rotate in succesion based on either a slider value (custom attributes) or the rot value of the first joint/bone.

thorn
gopherCG
07-21-2003, 12:29 PM
Okay, then I'll switch to wirings for hands.

I originally decided IK from: script, expression, wire, IK, and set-driven(reactor), because it seems the most versatille->avoids FK anim.

I was wondering IF there's a situation where the World axis problem must be addresses, then how do I work around to make IKs work on the local axis?


FYI, my new setup'll be this: 4 curl params for the 4 fingers. the curl params are connected to a mainCurl AND a naturalCurl, using an if statement to switch btw them.
I'll probably add a second layer manual control for the 4 curl params as well as the rotational FK.
thorn3d
07-21-2003, 02:52 PM
In terms of the IK situation - have you completed the tutorial manual sections on IK and rigging? They're quite comprehensive...

thorn
gopherCG
07-21-2003, 06:09 PM
Yep, I did some of them, including a bug rigging. I see an arm tutorial, but it doesn't go into finger rigging.
Does anyone know/have a detailed max file so I can see how ppl rig the hands and other parts?

Btw, thanks, I redid the rig and the hands move much better!
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