How should I use Unity shaders with spine

Asa

Sorry, I'm a beginner, thank you very much if you can get some advice

I need to add a new material to a certain accessory and then make this material work, but I encountered some problems when using it.

I used some examples

Now I want to make some changes to the sword's material，So I made a custom material using shader graph

I think I should just add the texture of the sword to the Sample Texture 2D node, but I have no way to do it. I can only choose the texture that comes with the spine, even if I have cut the sprite.The current effect is wrong

I have been troubled by this problem for a long time. I can only ask for your help. Thank you for your help.

Harald

@Asa Likely you need to export your atlas texture as Straight alpha workflow (Bleed enabled, Premultiply Alpha disabled).

Also, at the SkeletonAnimation component you likely need to disable Advanced - PMA Vertex Color (if you're not using blend mode One OneMinusSrcAlpha in your shader graph shader).

See the documentation here:
https://esotericsoftware.com/spine-unity#Shader-Graph

Asa

Harald Thank you very much for your guidance

Progress has indeed been made through the methods you have provide, but, It still has a problem。

How do I remove this black background, do I need to make it transparent in shader

Harald

Harald @Asa Likely you need to export your atlas texture as Straight alpha workflow (Bleed enabled, Premultiply Alpha disabled).

I assume you didn't perform all steps required for straight alpha export. If so, please show (or list) the relevant texture export settings in the Spine Editor, and the Texture import settings in Unity that you have changed since the initial posting.

I tried to set the Alpha Is Transparency of the texture to true

The texture does not look as if it had been exported as straight alpha. Please see the documentation below what is required for the straight alpha texture workflow, don't randomly enable just some texture settings:
https://esotericsoftware.com/spine-unity#Advanced---Premultiplied-vs-Straight-Alpha-Export
https://esotericsoftware.com/spine-unity#Advanced---Premultiplied-vs-Straight-Alpha-Import
Also the following sections might help:
https://esotericsoftware.com/spine-unity#Visual
https://esotericsoftware.com/spine-unity#Shader-Graph

Asa

I tried to set the Alpha Is Transparency of the texture to true

It's got some weird pixels

Asa

I roughly understand why. The material I created myself does not have the Straight Alpha Texture parameter, which seems to be a shader issue. I think I need to learn the shader before solving this problem

Thank you very much for your prompt

Asa

Harald
spine version:

spine export setting:

unity sprite setting:

unity material setting:

unity spine setting:

my unity custom material by shader graph:

my unity custom material:

my SkeletonAnimation setting:

Asa

Harald

@Asa Thanks for the extensive set of screenshots, this helps a lot. Your export and import settings are correct. What looks wrong is your shader graph, it seems to assign a constant alpha value of 0.5 at the fragment output:

Instead it should assign the texture alpha, which is ignored however.

Asa

Harald

I hope to gradually show/hide the weapon as the Alpha clip Threshold value changes, so by debugging, when alpha=0.5, I can achieve the desired effect exactly

Is it because of this that the current problem has arisen? Is there any other way to solve this problem。

This seems to be a very basic problem, but I can't solve it. I'm very sorry for taking up more of your time

Asa

Harald

Thank you very much for your help. I have solved this problem. It was my shader graph configuration that had an issue

Asa

I tried to use this method to set the background to transparent, but my weapon is no longer under transparent control

Harald

Yes, you can't just throw away the texture alpha information. 🙂 Glad to hear you've figured it out.