[Unity] SkeletonGhostPartsRenderer.cs sharedMesh null check

[Jamez0r]

Found a corner-case issue that results in a null-pointer in this situation:

SkeletonPartsRenderer gameobject with a SkeletonGhostPartsRenderer.

This all happens on the same frame:

1. The gameobject was disabled, and gets enabled. (While the gameobject was disabled the MeshFilter is set to "None").
2. An animation is played on the SkeletonAnimation that has a spine Event keyed on frame 0, which is used to activate the Ghosting.
3. A null-pointer exception is thrown in SkeletonGhostRenderer.cs in Initialize() because the meshFilter.sharedMesh is null.

My workaround (and maybe permanent solution?) was just to add a null check for meshFilter.sharedMesh in Update() on SkeletonGhostPartsRenderer.

Spine version.txt says package version spine-unity-4.0-2021-12-21.unitypackage

[HaraldCsaszar]

Unfortunately there is no file named SkeletonGhostPartsRenderer.cs and no class SkeletonGhostPartsRenderer in the spine-unity runtime. Did you mean another file/class?

[Jamez0r]

Hmm that is strange... There is the possibility that I created it myself (based on SkeletonGhostRenderer?). Unfortunately the file was created before we switched to our current VCS (around 2 years ago), so I can't easily see whether I created it myself or not. But if its not in the runtime, then I suppose I did! I'll upload it just in case, but sounds like it might have been a false alarm. Sorry!
SkeletonGhostPartsRenderer.cs.txt

[HaraldCsaszar]

No need to apologize!

Unfortunately I still fail to find such a file/component. What also leads me to believe we've never provided such a component is this thread (7 months ago):
http://esotericsoftware.com/forum/Using-Ghost-renderer-along-with-Separator-16380
So my guess is that you have indeed written this class yourself. Your fix of adding a null check seems very reasonable, so please feel free to add this to your code ;).