I'm attempting to use IK to have a character's foot always face in a certain direction (similar to the Spine example videos). However, I want the leg bone that is a couple of ascendants above the foot to use a Transform Constraint - specifically, I want a different bone to control the thigh bone's rotation at the hip joint. However, when I do this, the foot will not obey its IK constraint - it acts like I did not set up IK at all. If I change the skeleton so that the foot is no longer a descendant of the hip/leg, then its IK starts working. After a number of tests, my only conclusion is that a bone will ignore IK if any parent/ascendent in its hierarchy uses Transform Constraints.
Any suggestions?