I recently added a question about how to make my finger bones follow a rotating crank handle.

That was solved.

But of course this was not a full solution as I now have a problem that has no logical explanation.


The four of my fingers are IK constraint to an empty object which is child of a rotating crank handle object.

It works absolutely without a problem, they follow the empty just as I wanted to. I placed the empty where I needed it to be placed and everything is fine.

However the thumb is not following the empty, even though it is IK to the empty the same way all other fingers are. Whenever I move the empty the thumb is also moving, but when I animate the empty, the thumb doesn't move, all other fingers are moving.

I was playing a lot and found out that if I was to unparent the eyes from the armature it fixes the problem somehow ? Makes absolutely no sense, I now need to have my character with no eyes in order to make my thumb follow the empty with IK constraint ? What is going wrong here and how to fully fix this ? Is it because I have too many parented objects or too many IK constraints ? If anyone have some sort of solution to this puzzle let me know. Thanks

Eyes parented to armature

Unparenting the eyes

File here

  • $\begingroup$ hello, maybe share your file (remove the parts that are not useful)? $\endgroup$
    – moonboots
    Commented Apr 15, 2022 at 12:09
  • $\begingroup$ filemail.com/d/nvgplpsbthlvhif - Frame 711 is where it starts, I added child of constraint to the eyeballs with 0 influence but it still doesn't work, you need to fully remove the child of constraint in order for the thumb to start following the empty IK constraint. If I was to parent the eyes with ctrl+p same thing happens, I need to unparent before thumb starts moving again. $\endgroup$
    – L1994
    Commented Apr 15, 2022 at 12:29
  • $\begingroup$ What a nightmare... $\endgroup$
    – L1994
    Commented Apr 15, 2022 at 13:11
  • $\begingroup$ Well that is now creating a whole new world of problems because my weight painting skills r garbage and if I was to automatically paint weight the new bones for some reason the whole mesh is getting completely deformed $\endgroup$
    – L1994
    Commented Apr 15, 2022 at 13:14
  • 1
    $\begingroup$ I've found a way to make it work: Keep the bone but: Remove the Child Of of Empty1 and parent Empty1 to Empty, it seems to work $\endgroup$
    – moonboots
    Commented Apr 15, 2022 at 13:27

1 Answer 1


Maybe it's a bug but I've found a way to make your animation work: Select Empty1 and remove its Child Of constraint, parent Empty1 to Empty.


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