Is there any documentation on the IK constraint other than this wiki page?
In the leg rig I’m working on, I’ve got a chain of deforming stretch bones copying the rotation of an identical (non-deforming) IK chain, and sometimes the rotations mysteriously don’t match up when IK (which has the Stretch button on) is active without the ‘Stretch To’ constraints also being active. When both the ‘Stretch To’ and ‘IK’ constraints are on (Stretchy IK mode), there’s no problem!
Maybe it’d be fixed with a second set of IK constraints on the IK chain – two IK constraints per bone, one with Stretch on and one without, alternating with the ‘Stretchy Leg’ switch – but this seems sort of dangerous, and would probably be troublesome for keying space switching.
Has anyone else come across this, trying to build an FK/IK/StretchIK limb?
(I’m going to build a simple example blend, but am hoping someone else has come across this and solved it.)