Unity 6 and custom material bug

Scoppex

Hi. I have a problem with changing the material properties via MaterialPropertyBlock. I created my shader in the previous version of Unity and I could edit its properties by editing variables, e.g.
propertyBlock.SetFloat(diveDepthProperty, to);
targetRenderer.SetPropertyBlock(propertyBlock)
however, now after switching to Unity 6 this code does not work and my spine character disappears from the screen after making these changes. Additionally, if I do it "live" in the editor, these properties change normally on the screen. The update to Unity 6 caused this not to work. Are there already reports about this and will it be fixed?
Regards

Spinebot

The issue you're experiencing with MaterialPropertyBlock in Unity 6 might be related to changes in how Unity handles material properties or potential bugs introduced in the new version. There have been reports of issues when using MaterialPropertyBlock with Unity 6, particularly when properties are not initialized correctly, leading to unexpected behavior such as disappearing characters. This has been noted in the context of using MaterialPropertyBlock with Spine animations, where uninitialized data can cause problems. It is recommended to ensure that all properties are correctly initialized and to check if there are any updates or patches available for the spine-unity runtime that might address these issues. You can also try using the SkeletonAnimation.OnMeshAndMaterialsUpdated callback to manage material updates more reliably.

Harald

@Scoppex Sorry to hear you're having troubles. Which exact version of the spine-unity runtime are you using (name of the unitypackage, also listed in Assets/Spine/version.txt, or in the Package Manager window)?

Unfortunately I don't know what known issue Spinebot is referring to. I can't remember encountering this issue so far.

Did you perhaps switch from Build-In Render Pipeline to URP when switching to Unity 6?
Do you see any errors in the console?
Are you having multiple submeshes (multiple Materials) perhaps? Then you would need to call targetRenderer.SetPropertyBlock(propertyBlock, submeshIndex).

Scoppex

Im currently using Package version: spine-unity-4.2-2024-12-02.unitypackage****
I thing I didnt change anything with URP. I had a unity project before and just opened it in new Unity 6 version so it converts everything automaticly.
There are no errors in the console at all. My spine object using only one material.
I was thinking there are some Unity error and was waiting for update. After update that error persist, so I have checked if I can change my material properties on basic sprite objects then its ok (its not dissapearing). Only when im changing material that is in my spine character then it dissapear from the screen. Even when Im changing values back to default then character still is invisible. First change broke everyting and then its not comming back. It happening after targetRenderer.SetPropertyBlock(propertyBlock) line. I have spend hours and cannot figure out problem :*(

Harald

@Scoppex If you can create a minimal Unity project which still shows this issue (with only the character and a script setting the custom material), you can send us a zip file to contact@esotericsoftware.com (briefly mentioning this forum thread so that we know the context). Also be sure to not include the very large generated Library directory in the package. Then we can have a look at what's going wrong.

Scoppex

Done. I have sended and provided link to this topic.