Using SkeletonGraphic get error when generate single submesh

ChenTotal

I use SkeletonGraphic in my UI on 3.7.
After I upgraded to 3.8, I got an error.

1.
In SkeletonGraphic.cs, it called

public void LateUpdate () {
   if (freeze) return;
   //this.SetVerticesDirty(); // Which is better?
   UpdateMesh();
}

2.
In SkeletonGraphic.cs, it called

MeshGenerator.GenerateSingleSubmeshInstruction(currentInstructions, skeleton, null);

3.
In MeshGenerator.cs, it called

current.material = (Material)((AtlasRegion)rendererObject).page.rendererObject;

And I got a error

[Exception] NullReferenceException: Object reference not set to an instance of an object

I tracked the code, it showed rendererObject is null.
Is this a bug??

ChenTotal

Mario

I'm afraid this is not enough information. We need to be able to reproduce the NullReferenceException. Could you send us a small example that demonstrates the issue?

ChenTotal

This is my example, includes spine files and unity project.
https://mega.nz/#!3X5xXSCB!-kRAR-m3jDHNgwpZVBw286K1aNa6dP0evRzkHU1UDTU

In unity, open SampleScene. There are 2 objects under Canvas Error and Empty.
Both trigger unity to log error message.
The object "Empty" is support to show nothing, but in Spine 3.8 it would show a puzzle.

Mario

I can reproduce the issue using our repro, thanks! The part of the code that errors does so because it can not find an attachment for the slot 3_GetBrokenCard_EFF03 in the TEST_Empty skeleton.

The TEST_Error skeleton doesn't seem to have that problem. I couldn't figure out why TEST_Empty errors yet, I'll get back to you once we know what's going on.

Mario

Ah, found it. The Empty animation has an attachment key in the first frame

In the setup pose, the attachment isn't set on the slot. MeshGenerator doesn't take the possibility that not a single attachment is set into account. It shouldn't add an instruction in that case, as there's nothing to render.

I've created an issue for this here: https://github.com/EsotericSoftware/spine-runtimes/issues/1491

Thanks for reporting!

ChenTotal

If you fix this issue, would that fix the problem that the empty object should show nothing?

Mario

Jupp, that should fix that as well.

Harald

This issue has now been fixed. You can download updated unitypackages here as usual:
Spine Unity Download

Thanks for reporting!