KURPToonShading

March 6, 2024 · View on GitHub

Unity URP Toon Shading Library.

Unity Version: 2023.2.12f1

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Maya

Github address

https://github.com/SelfishKrus/MayaPython_AverageNormalsToUVs
Encode
- AverageNormalWS → AverageNormalTS → Encode to uv2 by Octahedron compression
Decode
- Decode uv2 → AverageNormalTS → AverageNormalWS

Deprecated due to undesirable gap of outlines

_IlmTex
- r - specular layer
  
  Specular Layer Value Material Feature
  0 general no specular, no rim
  50 general only rim
  100 leather specular and rim
  ≥200 metal only specular
- g - shadow offset
- b - specular range
- a - inner lines
Vertex Color
- r - AO
- g - position ID
- b - Z offset for outline offset
- a - outline thickness
UV
- TEXCOORD0 - uv0 - for texture mapping
- TEXCOORD1 - uv1 - to sample texture for uv lines
- TEXCOORD2 - uv2 - encoded average normals
- TEXCOORD3 - uv3 - tri-planar projected uv for shadow hatch
Tangent
- as the smooth normal direction for outline offset

Dfference between SampleSceneDepth(float2 uv) and LoadSceneDepth(uint2 uv) in URP Shader Library:
- SampleSceneDepth
  - screen space uv, ranging from 0 to 1
  - bilinear filter. smoother
- LoadSceneDepth
  - screen space uv, ranging from 0 to screen pixel size
  - no filtering
Add DepthOnly Pass in shader to make fragment depth written in _CameraDepthTexture
Params should make sense to artists, and range being clamped between 0 to 1
In maya, tangent can’t be modified because it’s determined by UV.
Coordinate system difference
- Maya - left-hand coordinate. Y up;
- Unity - right-hand coordinate; Y up;
When exporting FBX, make sure coordinate axes of Object Space align with the one of World Space in Maya