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03-UnrealEngine/卡通渲染相关资料/演讲笔记/JasonMa/JasonMa渲染方案分析.md
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@ -455,6 +455,27 @@ FDirectLighting ToonBxDF(FGBufferData GBuffer, half3 N, half3 V, half3 L, float
```
## Diffuse
```c++
...   
float3 LightColorAndAttenuation = AreaLight.FalloffColor * MooaToonContext.LightColor * Falloff;
    ColorSaturationPowerAndScale(LightColorAndAttenuation, View.MooaLightSaturationScale);
...
...
float DiffuseColorRampU = min3(saturate(Shadow.SurfaceShadow + HairShadowOffset), GBuffer.GBufferAO, ShadowGradient);
half4 DiffuseColorRamp = SampleGlobalRamp(View.MooaGlobalDiffuseColorRampAtlas, DiffuseColorRampU, ToonGBuffer.DiffuseColorRampIndex, View.MooaGlobalDiffuseColorRampAtlasHeight);
Shadow.SurfaceShadow = DiffuseColorRampU;
half3 ToonDiffuseColor = GBuffer.DiffuseColor;
half3 ToonShadowColor = ToonGBuffer.MainLightShadowColor * (1 - GBuffer.Metallic) * GetShadowColorIntensity(MooaToonContext);
#if USE_DEVELOPMENT_SHADERS
ToonShadowColor *= View.DiffuseOverrideParameter.w + View.DiffuseOverrideParameter.xyz;
#endif
ToonDiffuseColor = lerp(ToonShadowColor, ToonDiffuseColor, DiffuseColorRamp.a);
Lighting.Diffuse = Diffuse_Lambert(ToonDiffuseColor) * DiffuseColorRamp.rgb * LightColorAndAttenuation;
```
# 实用函数
如果需要脸部SDF阴影，就覆盖ShadowGradient。
```c++