Severe Light/Shadow Banding on lit PSX shader [URP][Unity 6.2]

[errant zealot]

As the title says, I'm trying to create a lit PSX shader in shader graph with vertex snapping, however the lower the vertex resolution I set, used in ranges of [8, 16, 32, 64, 128, etc...], creates a severe light banding effect on the models I apply it to. High resolutions like 256-512 barely have the effect but also barely have any snapping.

I have discovered that only when both cast shadows and recieve shadows are enabled it happens. If either is disabled there is no light banding so the shadow pass seems to not be using my vertex displacements properly

[flat hatch]

I suspect the issue is that "View" space is relative to the camera for regular rendering, but is from the point of view of the light when rendering shadowmaps. So vertices snaps to different positions and results in self-shadowing

I'd instead try using unity_WorldToCamera/unity_CameraToWorld in a custom function

Try Custom Function node. Under Node Settings tab while that node is highlighted :
Mode : String
Inputs :

• Position (Vector3)
• Steps (Float)
  Output :
• Out (Vector3)
  Body :

float3 pos = mul(unity_WorldToCamera, float4(Position, 1)).xyz;
pos = floor(pos * Steps) / Steps; // Posterize
Out = mul(unity_CameraToWorld, float4(pos.xyz, 1));

In graph use Position node in World space in graph for first input
And after Transform from World to Object

[errant zealot]

I'm basically a beginner with shaders so I don't know how to go about adding this

Oh I see custom function node, let me check that out quick

[errant zealot]

Testing it now

Seems to be working so far