Large lighting artifacts with cascaded shadows

[nicolasgustafsson]

Describe the bug
When the light is somewhat parallel to the surface it's lighting, you start seeing big circles when zooming in and out.

To Reproduce

1. Create a new scene
2. Make sure the main light is casting shadows
3. Make sure cascaded shadows are enabled
4. Create a large box
5. Apply a material with toon shading to that box
6. Rotate the light parallel to one of the sides of the box
7. Move back and forth with the camera to see the artifact

Expected behavior
Lighting should remain somewhat consistent when moving between shadow cascades

Screenshots
https://github.com/user-attachments/assets/56a58d5e-77a4-4679-8714-ae3e4b8bd36f

Additional context
I believe this is an issue with shadow attenuation in shader grahps in general, as I can reproduce similar artifacts when making my own custom lighting.

This person has a similar issue:
https://discussions.unity.com/t/custom-lighting-shadow-attenuation/1705978/3

[sindharta-tanuwijaya]

Hi, thank you for taking the time to report this.
Just in case, would you be able to share the project that you are using to repro this ?

[nicolasgustafsson]

Sure!

Broken Shadow Cascades.zip

There's a scene Scenes/SampleScene that highlights the issue.

[sindharta-tanuwijaya]

Hi, I took a look at your project.
It seems to be using "Custom Lighting Toon" shader graph, instead of toon shaders in the Toon Shader package

Is this correct ?

[sindharta-tanuwijaya]

I'm closing this issue since it appears you're using the Custom Lighting Toon Shader Graph, which is not related to the toon shaders in this repository.
Please feel free to reopen the issue if that's not the case.