chilimilk/turp

Introduction

Toon render pipeline modified from URP. Support deferred rendering and forward rendering, support NativeRenderPass. Not support subtractive lightingMode.

ShadingModel

Use global ramp map to control shadow.(In "Universal RP/Textures/Toon/ToonDiffuseRamp.png").

Now we have two shadingModel, Lit and SimpleLit, both modify from PBR.

Lit

Lit must be metallic workflow. It can interpolate between PBR.

-Outline : Back face outline, Color.R control width. Support smoothNormal outline. Use bakeTool to bake smoothNormal in tangent space, and store in uv3. Add suffix "_SN" on fbx file, then check "ToonOutlineSmoothNormal" on material. BakeToolReference:https://zhuanlan.zhihu.com/p/107664564

-Shadow : Use ToonDiffuseRampV control how to sample global ramp map. Shadow color only in MainLight, prevent overexposure.

-DepthShadow: Sample ToonDepthTexture with offset screenUV and screenUV, then compare to get depthShadow.

-PointShadow: In some cases, we dont want slefShadow, for example character, when disable receiveShadows, character alway in lighting, this function sample a worldSpace point in MainLightShadowMap, use control a character in lighting or not, have to setup a "ToonShadingProperty" component.

-Specular : Only control specular feather.

-Rim: ToonDepthTexture control rim(must enable "ToonData"), not support in forward rendering path.

-MatCap: Add as emission.

-ToonData: Render in ToonDepthTexture and ToonDataTexture.(Enable on Character)

-ToonID: Use in rimLight、depthShadow、outline, set different id for different parts of the character.

SimpleLit

SimpleLit have more control on shadow, but simple specular.

-Outline : Same as lit.

-Shadow : Use ToonDiffuseRampV control how to sample global ramp map. Can control ShadowOffset and StaticShadowMap.

-DepthShadow: Same as lit.

-SDFShadow: Character face shadow.(Have to setup "ToonShadingProperty" component)

-PointShadow: Same as lit.

-Rim: Same as lit.

-MatCap: Same as lit.

-ToonData: Same as lit.

-ToonID: Same as lit.

Deferred Rendering Path

Gbuffer Layout

Default URP Gbuffer layout

https://docs.unity3d.com/Packages/[email protected]/manual/rendering/deferred-rendering-path.html

TURP Gbuffer Layout

Different from default URP layout:

-Lit
Gbuffer1: Metallic DiffuseRampV SpecularFeather Occlusion

MaterialFlags:
Bit 0, ReceiveShadowsOff: if set, the pixel does not receive dynamic shadows.
Bit 1, SpecularHighlightsOff: if set, the pixel does not receive specular highlights.
Bit 2, DepthShadowEnable: if set, the pixel sample ToonDepthTexture to get depthShadow.
Bit 3, PointShadow. if ReceiveShadowsOff, the pixel uses check object in shadow.

-SimpleLit
Gbuffer1: Specular DiffuseRampV DiffuseRampOffset StaticShadow

MaterialFlags:
Bit 0, ReceiveShadowsOff: if set, the pixel does not receive dynamic shadows.
Bit 1, SDFShadow: enable SDFShadow.
Bit 2, DepthShadowEnable: if set, the pixel sample ToonDepthTexture to get depthShadow.
Bit 3, PointShadow. if ReceiveShadowsOff, the pixel uses check object in shadow.

ToonData buffer

No memoryless. (Vulkan API subpassLoad() cant load gbuffer with specific uv, we need to sample toonData with offsetuv)
-ToonDepthTexture: 16 bit depth buffer.Use to render character rim, depthShadow.
-ToonDataTexture: 8 bit. Store material id, use to render character depthShadow、 PostProcessOutline.

Setting

ShaderGraph

Only lit Shader, not fully feature.

ToneMapping

Modify ACES (In "Core RP Library/ShaderLibrary/Color.hlsl").

Other

Forward+ RenderingPath has some problems. NativeRenderPass dont work in scene window. NativeRenderPass has bug, if scene shadow look wrong, maybe re-check NativeRenderPass in UniversalRenderer asset.
UnityEditor 2022.2+
Universal RP 14.0.6

Reference

© Unity Technologies Japan/UCL(https://unity-chan.com/)
https://github.com/TechMiZ/ToonShadingCollection