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Unity SkeletonGraphic exception when "allowMultipleCanvasRenderers" disabled

nilan256

Problem statement

Describe: 1) what you have tried

Upgrade spine 4.2 to 4.3, some ui spine assets are no longer available.

2) what you expected,
The component can work correctly, just like in 4.2.

3) what actually happened.
An exception was thrown when playing the animation.

NullReferenceException: Object reference not set to an instance of an object
Spine.Unity.MeshGenerator.AddSubmesh (Spine.Unity.SubmeshInstruction instruction, System.Boolean updateTriangles) (at ./Library/PackageCache/com.esotericsoftware.spine.spine-unity@29e87186b6/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs:558)
Spine.Unity.SkeletonGraphic.FillSingleBufferFromInstructions (Spine.ExposedList`1[T] workingSubmeshInstructions, Spine.Unity.MeshRendererBuffers+SmartMesh currentSmartMesh, System.Boolean updateTriangles) (at ./Library/PackageCache/com.esotericsoftware.spine.spine-unity@29e87186b6/Runtime/spine-unity/Components/SkeletonGraphic.cs:878)
Spine.Unity.SkeletonGraphic.FillBuffersFromSubmeshInstructions (Spine.ExposedList`1[T] workingSubmeshInstructions, Spine.Unity.MeshRendererBuffers+SmartMesh currentSmartMesh, System.Boolean updateTriangles) (at ./Library/PackageCache/com.esotericsoftware.spine.spine-unity@29e87186b6/Runtime/spine-unity/Components/SkeletonGraphic.cs:836)
Spine.Unity.SkeletonGraphic.UpdateBuffersToInstructions (System.Boolean calledFromMainThread) (at ./Library/PackageCache/com.esotericsoftware.spine.spine-unity@29e87186b6/Runtime/spine-unity/Components/SkeletonGraphic.Common.cs:655)
Spine.Unity.SkeletonGraphic.UpdateMesh (System.Boolean calledFromMainThread) (at ./Library/PackageCache/com.esotericsoftware.spine.spine-unity@29e87186b6/Runtime/spine-unity/Components/SkeletonGraphic.Common.cs:625)
Spine.Unity.SkeletonGraphic.LateUpdateImplementation (System.Boolean calledFromMainThread) (at ./Library/PackageCache/com.esotericsoftware.spine.spine-unity@29e87186b6/Runtime/spine-unity/Components/SkeletonGraphic.cs:1437)
Spine.Unity.SkeletonGraphic.LateUpdate () (at ./Library/PackageCache/com.esotericsoftware.spine.spine-unity@29e87186b6/Runtime/spine-unity/Components/SkeletonGraphic.cs:456)

Give step-by-step instructions so we can reproduce the problem, if possible.

spine-assets.zip

68kB

Import the resources in the attachment.
Create SkeletonGraphic in Canvas.
Keep the "allowMultipleCanvasRenderers" option disabled.
Play "animation".

Enabling the option can solve this problem, but I need to change all assets in the game, which is quite a pain.

Runtime information

Tell us your Spine Runtimes version.

Use Spine Runtimes via package manager.

"com.esotericsoftware.spine.spine-csharp": "https://github.com/EsotericSoftware/spine-runtimes.git?path=spine-csharp/src#4.3",
"com.esotericsoftware.spine.spine-unity": "https://github.com/EsotericSoftware/spine-runtimes.git?path=spine-unity/Assets/Spine#4.3",

Spinebot

I can see the issue you're encountering. This appears to be a regression in spine-unity 4.3 when allowMultipleCanvasRenderers is disabled on SkeletonGraphic.

The Problem

The NullReferenceException occurs in MeshGenerator.AddSubmesh() when the component tries to render with allowMultipleCanvasRenderers disabled. This is a bug that was introduced in version 4.3.

Recommended Solution

While enabling allowMultipleCanvasRenderers works around the issue, I understand that's not ideal for your project. Here are your options:

Update to the latest 4.3 version: Check if you're using the absolute latest version from the repository. Bug fixes are continuously being published, and this issue may have already been addressed. Make sure to update your package reference to get the latest commits.
Use the UPM package from the download page: Instead of using the git URL, try downloading the latest spine-unity 4.3 UPM package from:
https://esotericsoftware.com/spine-unity-download#spine-unity-unitypackages
Temporary workaround: If updating doesn't resolve the issue, you can temporarily enable allowMultipleCanvasRenderers on the affected SkeletonGraphic components while waiting for a fix.

Before Updating

Make a backup of your project before updating
Close any scenes containing Spine components or close Unity entirely before updating packages
After updating, let Unity reimport all assets

If the issue persists after trying the latest version, this would be worth reporting as it's a regression from 4.2 where the feature worked correctly with allowMultipleCanvasRenderers disabled.

Harald

@nilan256 Thanks for reporting and sorry for the troubles!

This issue has just been fixed. A new spine-unity 4.3 unitypackage is available:
https://esotericsoftware.com/spine-unity-download

Issue ticket for later reference:
EsotericSoftware/spine-runtimes3104