[Unity] YBone is down

BinaryCats

About a week ago Nate, announced he fixed a bug which effects IK which manipulate a single bone (not two bones) when flipped. However, this bug still occurs in unity if you flip the skeleton:

My reply in the thread viewtopic.php?f=7&t=3854
"Hi,

I just checked it with unity (using the latest runtime) and the problem still persists. When an IK is manipulating two bones and the X is flipped it works fine, but if the IK is manipulating one bone then it does not resolve correctly. Is there something special that needs to be called?

Its also worth noting it happens in editor too.

"

I am aware there are work arounds, but these work arounds have a lot of repercussions. Hopefully this will be fixed soon.

cjuillard

I believe I'm running into the same issue. Flipping along the X-axis is causing bones with IK constraints to have incorrect positions. This can be reproduced in both the editor and the Libgdx runtime.

I attached a Spine file that shows this issue - if you flip the root bone along the X-axis you'll see the issue.

BinaryCats

beep boop, 'this isn't a bug'.

To rectify this 'not a bug' you will need to place a bone (length can be 0) at the same point as your bone you want to IK. Make this bone the parent to your original bone. Then IK both the original bone and the new parent bone. then the ik will flip

beep boop

Nate

Sorry for the lack of a response on the IK problem. The bone flipping is currently not so good. We are considering changing it, see the discussion here:
viewtopic.php?p=18064#p18064