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BoneFollower issue: object upside down for single frame

SullyTheStrange

I have a simple setup, where the ninja's body is one SkeletonAnimation and the hands are a separate one using a BoneFollower. When the ninja flips using FlipX, the hands appear to flip upside down for a single frame before behaving correctly again. The BoneFollower uses followBoneRotation and followSkeletonFlip (I hadn't updated the runtime to receive the followLocalScale addition, but I just tried and that didn't change anything), and this behavior occurs both when the hands are a child to the body and when they're not.

(Situation in the clip used for visibility purposes, but it happens in all situations no matter what)

Interestingly, when viewing it frame by frame, it looks like the hands are flipped upside down for one frame BEFORE the body actually flips, and next frame once the body flips, the hands are correct again. I noticed that the hands transform's y localScale is set to -1 when flipped, so the upside down part makes sense, but why is it being flipped before the body is? Just an unfortunate effect of script execution order?

Using Spine 3.4.02, Unity 5.3.4p6, last updated the runtime September 13th it looks like...

Pharan

Very likely a script execution order thing.

Though I'm not sure under what conditions it would mismatch visually. Both the skeleton's mesh update and the transform flip are done in LateUpdate.

SullyTheStrange

Does Spine change the script execution order by default? I checked and had SkeletonAnimation set to -23000, but I maaaaaay have done that myself... I took it out and the problem went away, but if I did it, I wonder what other issue I was trying to solve...

Either way, yes, that seemed to be the culprit. So if I was the one who set that execution order, well, oops. 🙂

Pharan

No. Spine-Unity doesn't set any script execution order values for any of its scripts.
It's a bit of a holdover design from Unity 3 or 4, I think. Or whenever it was that you couldn't cleanly serialize it.