Such beautiful animations. Too much detail is missing from this post and its related post on "two-joint inverse kinematics" (that is actually three joint inverse kinematics) - what are the joint types? which inverse kinematics problem is being solved (position, orientation, or both?). This could be a great post if the author spends some more time polishing it.
I'm currently spending all my hobby project tokens getting astro to help with this problem... but with skis on. Mind blowingly abysmal results so far! Thanks for showing your work.
I was recently wondering why foot sliding is still a common problem in fighting games. Surely with Inverse Kinematics it should be possible to fix this problem by now. I have the suspicion that people who are accustomed to fighting games are so used to it that they don't notice it anymore, or view it as correct behavior.
It's a graphical problem. Inverse kinematics is purely a graphical technique. It has no effect on gameplay. That doesn't mean it's irrelevant, except insofar graphical fidelity is irrelevant in general.
FYI in case the author sees this