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IK hip joint flip

by user91 posted 14-01-2018 | 2 comments

I'm not sure why the hip joint at top of ik chain is flipping at certain angles, but since there are no keys on the joint itself, I can't use the euler filter. Anyway to overcome this? It drives other joints, so I could wedge in some intermediate attribute that gets keyed on/off to compensate for the flip, but that's a sad solve. Any better ideas?

Left hip, primary axis is X, Z pointing +Z.


by user3 posted 22-01-2018

I am not exactly sure what the problem is but here are a couple of suggestions to consider.

  • Are you possibly breaking the IK solver? Meaning, is there any chance that the knee joint is rotated, so that it's lying on top or beyond the hip joint?
  • Is there any chance the pole vector is the culprit?
  • As [elsonkms92] suggested, anything weird with the jointOrient on the knee joint?


by user76 posted 15-01-2018

Probably your joint orient is messed up. How about uploading just the joints with flipped problem ik chain for us to disect? :)