Transparency issue when using Shader Graph shaders in particles

[Ziplaw]

Objects seem to not use transparency when viewed in Game View in the editor, as seen here:

This is due to the fact that whatever is rendering the particles ("Bake Camera" I think?) rendering the generated quad with the Scene Picking and Scene Selection passes auto-generated by Shader Graph:

These passes are not used during normal rendering, so they should be skipped by the rendering of the particles

[mob-sakai]

Thank you for your reporting!

[mob-sakai]

Tell me about your develop/build environment.

• version [e.g. 2.3.6]
• Platform: [e.g. Editor(Windows/Mac), Standalone(Windows/Mac), iOS, Android, WebGL]
• Unity version: [e.g. 2022.2.0f1]
• Build options: [e.g. IL2CPP, .Net 4.x, URP/HDRP]

Could you please attach a minimal project (included Assets, Packages and ProjectSettings directories) that reproduces the issue?
Of course, you don't need to include any secret assets from your project. Feel free to use free assets instead.

[mob-sakai]

Is it "Canvas Shader Graph"?

[Ziplaw]

version 4.9.1
Platform: Editor(Windows/Mac), iOS
Unity version: 2022.3.42f1
Build options: Mono, URP

It's a Sprite Unlit Shadergraph, I believe Canvas Shader Graph is not supported in LTS as of yet, I'll send a repro project
Repro.zip
As you'll see, it will render the Scene Picking and Scene Selection passes as actual passes

[mob-sakai]

Thank you.
The issue is reproduced on my environment.
Just to confirm, does the issue also occur outside of the editor?

[mob-sakai]

A similar issue has been reported:
https://discussions.unity.com/t/shader-graph-ui-image-shader-does-not-work/863148

[mob-sakai]

It seems fully supporting this may be challenging. Here are the workarounds:

Workaround 1: Create a new shader

1. Follow the steps in discussions to generate shader code.
2. Save the shader code as a *.shader file.
3. Remove 3 passes (Spite Unlit (LightMode=Universal2D), SceneSelectionPass and ScenePickingPass) from the saved shader code.

Workaround 2: Use a render mode other than Overlay.

Workaround 3: Use the Canvas template

1. Update Unity to 2023.2 or higher.
2. In Shader Graph, use the Canvas template instead of the Sprite Unlit template.

P.S. I'll try skipping the passes in Overlay UI mode using RenderFeature, but... don't expect too much!

[JustinPrat]

Would also love to have this fixed, will for now use the remove passes workaround, thanks !