I think I did a similar setup 2 years ago. I don't'know your character/rig situation but it's just about the restrictions in the rotation-planes? So, one joint rotates in xy and the underlying should only rotate in xz for example, but within a usable IK chain.
When I have the time, I will check out that scene, but it was something with a few constraints, '1bone-IK' chains and expressions (to limit position of the effectors in 2d planes) So, you're right. I think, its not possible with a 2bone IK and nothing else :) regards sven From: softimage-boun...@listproc.autodesk.com [mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of Florian Eberle Sent: Wednesday, May 09, 2012 12:38 To: softimage@listproc.autodesk.com Subject: [Rigging] Robot IK Legs hello people banging my had about a rigging setup here: i have a rather stiff robot that needs to be rigged and i'm struggling with the IK-setup for the legs. the problem is the structure of the robots hips. it's very restricted in that it only has two hinge joints. one that allows the leg to rotate front/back and the other rotates out/in, rotation along the leg is not possible. the two hinges are not in the same place (obviously) so i have different rotation points. and to complicate things even more: the knee does not lie on the legs 'plane' but is offset a good amount. after some very frustrating tries i'm reasonably sure that it's just not possible to rig with the built in two bone IK. can someone prove me wrong here (or at least tell me i'm right)? i'd appreciate any hints, tips, trick and references thanks -- Flo Eberle Lead Modeling Artist/ Technical Director
