Hi, Everyone
I would like to know, if someone knows how two knee joints or two elbow joints works, cause i don't understand why LowerArm_IK or LowerLeg_IK controllers remains in its position in IK mode instead to follow orientation of leg world ik ctrl or arm world ik ctrl.
Thank you
The extra knee joint is intended for something like a dog leg, with a raised ankle while also needing more control at the ball of the foot. So the first knee acts as a knee and the second acts more like an ankle. Also useful for birds that have a back toe that needs to stay grounded when ankle lifts.
Currently there isn’t a way to split one knee joint’s rotation into two joints in IK mode, like you are trying to do.
The reason for this is to be consistent with a one-knee/one-elbow setup. When rotating the foot, the knee should not move, same with rotating the wrist, the elbow should not move. This is true for a one knee/elbow set up, and should be consistent for a two knee/elbow. For example, imagine your character is sitting on a chair with feet dangling over the edge. Or kneeling on the ground. Rotating the foot would cause the knee to move, so animators would have to constantly counter-animate the knee/elbow to keep it in place. The twist axis does affect though, as knees/elbows do not twist. They are hinge joints.