Spine2D animation blink in Unity

ShigureTokisaki

Hi Spine2D team. I use Spine animation in my unity programe, but there are some problems. I hope you can help me. Thanks a lot.
First I use Spine 4.0 runtime and Unity version is 2021.3.19f1

I create a prefab(SkeletonAnimaiton) by Spine SkeletonData and I want to change the play scale of animation by "Time Scale", but no matter how I adjust this value, it has no effect in runtime. I can only change the Unity engine's TimeScale, I wan't do that.
Here is my spine character, he can blink his eyes. (ScreenShoot 1)I change attach Region's visibility to achieve this. And I use Unity material stencil to cut a part of this character in games. well. boom! when the character blink his eye, the prefeb change the spine material to (material) and the new material's stencil comparison is different with default instance material, so the character is blink like a star XD, you can see Video 1.I try to cancle attach Region in animation by spine editor and everything looks like right.

ScreenShoot 1:

Video 1:

Harald

ShigureTokisaki Here is my spine character, he can blink his eyes. (ScreenShoot 1)I change attach Region's visibility to achieve this. And I use Unity material stencil to cut a part of this character in games. well. boom! when the character blink his eye, the prefeb change the spine material to (material) and the new material's stencil comparison is different with default instance material, so the character is blink like a star XD, you can see Video 1

Sorry for the delay!

It seems that your problem occurs because you are assigning or modifying the MeshRenderer's material directly. Now whenever attachments or draw order change, Materials are re-assigned automatically by the SkeletonRenderer to match the currently active attachments, as described in the documentation here:
https://esotericsoftware.com/spine-unity#Materials

Now it depends on whether you want to apply your material settings to all skeleton instances or to only a single one. In order to change the material for all skeleton instances, you can simply modify the shared material assets, which are located next to your SkeletonDataAsset.
If however you want to modify Material properties for a single instance, please see the documentation section below, there are multiple options available which ensure that your changes are not overridden:
https://esotericsoftware.com/spine-unity#Changing-Materials-Per-Instance

ShigureTokisaki

I'm sorry for the first question, the time scale can run correctly, it seems just a progrem bug. lol

ShigureTokisaki

Oh. Sad ;; I try to do this in another Online PC, I failed. I will try to find some different between the two PC. By the way, I use Spine URP package and I change shader to URP2D

ShigureTokisaki

ShigureTokisaki I use FGUI framework

Nate

Sorry, Harald is our Unity expert and he's on vacation until next week. Misaki is also familiar with Unity a bit, but she's out until Thursday. I'm afraid I don't know enough about Unity to be able to help you much!

The video you linked seems not to work.

I can say that if you are doing pixel art, you probably want to check your Spine settings for the viewport. Set smoothing to 0 and maybe uncheck highlight smoothing. It'll be easier to see your art (but won't help with your questions).

ShigureTokisaki

Nate Okay, thank you~ Actually my description was a bit confusing. I will post the information I know later about this bug. If technical experts is back, they can help with the investigation. We had found some ways to solve this question.

Misaki

ShigureTokisaki Fortunately, I was able to play the video you attached so I could see the problem, but I have no idea what caused it. I understand that you will post additional information later, but I may ask you to send us a minimal Unity project that can reproduce the problem if I still can't find the cause with the additional information.

ShigureTokisaki

YES! That's exactly what I want!
In these past few days, I've been trying to replicate my issue, but there's a peculiar bug affecting my judgment. This bug appears and disappears occasionally. However, it seems that what you said is correct; we indeed don't want to modify the shared material. So, making modifications to materials caused this problem. This is what I wanted to mention in the additional information. We will try "CustomMaterialOverride" or other functions. I will sharing our progress!

Harald

@ShigureTokisaki Glad to hear it helped! Thanks for letting us know.

ShigureTokisaki

Harald
Hello Harald, thanks for you help!
When I use sharedMaterial can run perfect, sharedMaterial will change unity local material file, we use SVN to manage project, it's a trouble for us. So i want to create a runtime material instance and change it's stencil value.But by this way, the spine character start blink.That's the main problem.
I have try CustomMaterialOverride. But it's seems no effect.
Here is the code

public static void ChangeCustomMaterialOverride(GameObject gameObject)
{
    SkeletonAnimation skeletonAnimation = gameObject.GetComponent<SkeletonAnimation>();
    if (skeletonAnimation != null)
    {
        foreach(AtlasAssetBase Base in skeletonAnimation.SkeletonDataAsset.atlasAssets)
        {
            Material orgMat = Base.PrimaryMaterial;
            Debug.LogWarning(orgMat.GetInstanceID());
            Material newMat = Material.Instantiate(orgMat);
            Debug.LogWarning(newMat.GetInstanceID());
            skeletonAnimation.CustomMaterialOverride[orgMat] = Material.Instantiate(newMat);
        }
    }
}

Now I still use sharedMaterial, the ID value between orgMat and newMat are different, but it's still change unity local material file
; ;

Harald

ShigureTokisaki Now I still use sharedMaterial, the ID value between orgMat and newMat are different, but it's still change unity local material file

Then you are likely mixing things up in your assignment code. How do you change the stencil settings at your material now?

If you want to change it for all skeleton instances in your whole project, modify the original material asset and commit the change to your SVN repository.

If you want to set the stencil property at only some skeletons, it's best to create a single Material asset where this stencil property is set up accordingly, and then assign this same Material asset as CustomMaterialOverride. You can have a try using the SkeletonRendererCustomMaterials component in the editor, of have a look at its code, if you are unsure about how to use skeletonAnimation.CustomMaterialOverride.