I'm trying to rig a leg that has two thigh bones (one to move the leg around the hip and the other to rotate the thigh around the bone's main axis):
The IK constraint on the Shin bone reaches up to ThighB; ThighR has X and Z locks enabled on the bone's IK tab so as not to bend the leg between ThighB and ThighR. This works fine.
I tried to lock the ThighB's Y axis on the bone's IK tab but this has no effect - ThighB still changes it's roll when I move the leg (I also tried using a limit and setting a high stiffness, this also didn't work):
So I have two questions:
- What exactly is the "Limit Y" / "Lock Y" option good for, since it doesn't seem to work as I expect it to?
- Is there a way to keep the IK Solver from rolling/rotating ThighB around the y axis?
I'm aware that I could set up a second chain that just used a single bone and then copy the x,z rotation to the ThighB and the roll or the y rotation to ThighR, but I'm looking for a simple solution first.