diff --git a/.obsidian/plugins/various-complements/histories.json b/.obsidian/plugins/various-complements/histories.json index 2ea73ef..6eaa8f5 100644 --- a/.obsidian/plugins/various-complements/histories.json +++ b/.obsidian/plugins/various-complements/histories.json @@ -1 +1 @@ -{"Deprecated":{"Deprecated":{"internalLink":{"count":1,"lastUpdated":1740405714148}}},"PS.需要Shader添加FSceneTextureShaderParameters":{"PS.需要Shader添加FSceneTextureShaderParameters":{"currentFile":{"count":1,"lastUpdated":1740983366427}}},"和blender共同制作，山脉为":{"和blender共同制作，山脉为":{"currentFile":{"count":1,"lastUpdated":1741610747166}}},"BlueprintCosmetic":{"BlueprintCosmetic":{"internalLink":{"count":1,"lastUpdated":1741951657866}}},"ReflectionsColor":{"ReflectionsColor":{"currentFile":{"count":1,"lastUpdated":1742739458164}}}} \ No newline at end of file +{"Deprecated":{"Deprecated":{"internalLink":{"count":1,"lastUpdated":1740405714148}}},"PS.需要Shader添加FSceneTextureShaderParameters":{"PS.需要Shader添加FSceneTextureShaderParameters":{"currentFile":{"count":1,"lastUpdated":1740983366427}}},"和blender共同制作，山脉为":{"和blender共同制作，山脉为":{"currentFile":{"count":1,"lastUpdated":1741610747166}}},"BlueprintCosmetic":{"BlueprintCosmetic":{"internalLink":{"count":1,"lastUpdated":1741951657866}}},"ReflectionsColor":{"ReflectionsColor":{"currentFile":{"count":1,"lastUpdated":1742739458164}}},"主要执行了：":{"主要执行了：":{"currentFile":{"count":1,"lastUpdated":1742830096172}}}} \ No newline at end of file diff --git a/03-UnrealEngine/卡通渲染相关资料/渲染功能/ToonReflection&GI控制/ToonReflection.md b/03-UnrealEngine/卡通渲染相关资料/渲染功能/ToonReflection&GI控制/ToonReflection.md index 32bcc73..ceab8d1 100644 --- a/03-UnrealEngine/卡通渲染相关资料/渲染功能/ToonReflection&GI控制/ToonReflection.md +++ b/03-UnrealEngine/卡通渲染相关资料/渲染功能/ToonReflection&GI控制/ToonReflection.md @@ -12,6 +12,7 @@ rating: ⭐ - LumenReflections - [[#DiffuseIndirectComposite]] +PS. DiffuseIndirectAndAO Pass会根据 ViewPipelineState.DiffuseIndirectMethod是否为Lumen，出现在Light Pass之前（GI方法为Lumen）或者之后（GI方法为非Lumen）。 ## ReflectionEnvironmentAndSky 位于IndirectLightRendering.cpp的RenderDeferredReflectionsAndSkyLighting() => `AddSkyReflectionPass()` @@ -289,6 +290,7 @@ float3 ReflectionEnvironment(FGBufferData GBuffer, float AmbientOcclusion, float ``` ### GatherRadiance() +GatherRadiance()主要计算了SkyLightTexture（天空盒贴图）以及ReflectionCapture（Box、Sphere反射球），最终根据之前计算的Color.a进行合成。 ```c++ float3 GatherRadiance(float CompositeAlpha, float3 TranslatedWorldPosition, float3 RayDirection, float Roughness, float3 BentNormal, float IndirectIrradiance, uint ShadingModelID, uint NumCulledReflectionCaptures, uint CaptureDataStartIndex) { @@ -319,7 +321,7 @@ float3 GatherRadiance(float CompositeAlpha, float3 TranslatedWorldPosition, floa } ``` - +主要逻辑位于CompositeReflectionCapturesAndSkylightTWS(): ```c++ float3 CompositeReflectionCapturesAndSkylightTWS( float CompositeAlpha, @@ -341,20 +343,22 @@ float3 CompositeReflectionCapturesAndSkylightTWS( #if REFLECTION_COMPOSITE_USE_BLENDED_REFLECTION_CAPTURES // Accumulate reflections from captures affecting this tile, applying largest captures first so that the smallest ones display on top + //ReflectionCapture Blend，其顺序为大范围在前 LOOP for (uint TileCaptureIndex = 0; TileCaptureIndex < NumCapturesAffectingTile; TileCaptureIndex++) { BRANCH - if (ImageBasedReflections.a < 0.001) + if (ImageBasedReflections.a < 0.001)//如果Alpha小于0.001则停止循环，结束合成计算。 { break; } + //计算CaptureIndex uint CaptureIndex = 0; #ifdef REFLECTION_COMPOSITE_NO_CULLING_DATA CaptureIndex = TileCaptureIndex; // Go from 0 to NumCapturesAffectingTile as absolute index in capture array #else - #if (INSTANCED_STEREO || MOBILE_MULTI_VIEW) + #if (INSTANCED_STEREO || MOBILE_MULTI_VIEW)//VR或者移动端多View BRANCH if (EyeIndex == 0) { @@ -382,7 +386,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS( float NormalizedDistanceToCapture = saturate(CaptureVectorLength / CaptureRadius); BRANCH - if (CaptureVectorLength < CaptureRadius) + if (CaptureVectorLength < CaptureRadius)//当前像素处于ReflectionCapture范围内 { float3 ProjectedCaptureVector = RayDirection; float4 CaptureOffsetAndAverageBrightness = GetReflectionCaptureOffsetAndAverageBrightness(CaptureIndex); @@ -392,6 +396,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS( #define PROJECT_ONTO_SHAPE 1 #if PROJECT_ONTO_SHAPE + //盒形反射球 #if REFLECTION_COMPOSITE_HAS_BOX_CAPTURES #if REFLECTION_COMPOSITE_HAS_SPHERE_CAPTURES // Box @@ -402,7 +407,8 @@ float3 CompositeReflectionCapturesAndSkylightTWS( GetReflectionBoxTransform(CaptureIndex), GetReflectionBoxScales(CaptureIndex), CaptureOffsetAndAverageBrightness.xyz, DistanceAlpha); } #endif - + + //球形反射球 #if REFLECTION_COMPOSITE_HAS_SPHERE_CAPTURES // Sphere #if REFLECTION_COMPOSITE_HAS_BOX_CAPTURES @@ -419,6 +425,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS( float CaptureArrayIndex = CaptureProperties.g; { + //采样对应的ReflectionCubeMap，Sample.a为根据距离计算的Alpha。最后结果累加到ImageBasedReflections中。 float4 Sample = ReflectionStruct.ReflectionCubemap.SampleLevel(ReflectionStruct.ReflectionCubemapSampler, float4(ProjectedCaptureVector, CaptureArrayIndex), Mip); Sample.rgb *= CaptureProperties.r; @@ -436,7 +443,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS( } #else - + //非ReflectionCapture Blend float3 ProjectedCaptureVector = RayDirection; FLWCVector3 SingleCaptureWorldPosition = MakeLWCVector3(GetReflectionTilePosition(SingleCaptureIndex).xyz, GetReflectionPositionAndRadius(SingleCaptureIndex).xyz); @@ -483,6 +490,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS( { float SkyAverageBrightness = 1.0f; + // 不支持Blend的，结果大致为SkyLightCubeMap * View.SkyLightColor。支持Blend的，lerp(Reflection, BlendDestinationReflection * View.SkyLightColor.rgb, ReflectionStruct.SkyLightParameters.w); #if REFLECTION_COMPOSITE_SUPPORT_SKYLIGHT_BLEND float3 SkyLighting = GetSkyLightReflectionSupportingBlend(RayDirection, Roughness, SkyAverageBrightness); #else @@ -517,4 +525,60 @@ float3 CompositeReflectionCapturesAndSkylightTWS( ## DiffuseIndirectComposite -位于IndirectLightRendering.cpp的`RenderDiffuseIndirectAndAmbientOcclusion()` \ No newline at end of file +位于IndirectLightRendering.cpp的`RenderDiffuseIndirectAndAmbientOcclusion()` + +`RenderDiffuseIndirectAndAmbientOcclusion()`主要执行了： +1. 进行判断是否跳过当前View的计算。（主要是判断是否开启Lumen，以及传入的bCompositeRegularLumenOnly变量） +2. SetupCommonDiffuseIndirectParameters() +3. 计算GI + - ScreenSpaceGI + - RTGI + - Lumen + - Lumen Reflection：输出结果到OutTextures.Textures[3]。 + - SSR：输出结果到OutTextures.Textures[3]。 + - 其他Reflection：结果输出为黑色。 +4. 使用降噪器对SSGI与RTGI进行降噪 +5. 渲染AO + - 禁用 + - RTAO + - SSAO + - 其他没有实现的会谈报错提醒 +6. 将渲染的AO结果赋予SceneTextures.ScreenSpaceAO +7. RenderHairStrandsAmbientOcclusion() +8. + + +位于IndirectLightRendering.cpp的RenderDeferredReflectionsAndSkyLighting() => `AddSkyReflectionPass()` + +当`DiffuseIndirectMethod = EDiffuseIndirectMethod::Lumen`（也就是开启Lumen GI），如果反射方法为Lumen或者SSR则不会执行后续逻辑。 + +不开启Lumen GI，反射方法为： +- Lumen：`RenderLumenReflections()` +- RT Reflection：`RenderRayTracingReflections()` +- SSR：`ScreenSpaceRayTracing::RenderScreenSpaceReflections()` + +`RenderDeferredReflectionsAndSkyLighting()`主要执行了： +1. SkyLightDiffuse + 1. RenderDistanceFieldLighting() + 1. RenderDistanceFieldAOScreenGrid()：渲染距离场AO。 + 2. RenderCapsuleShadowsForMovableSkylight()：渲染胶囊阴影。 +2. ReflectionIndirect + - RenderLumenReflections() + - RenderRayTracingReflections() + - RenderScreenSpaceReflections() +3. Denoise + - Denoiser：IScreenSpaceDenoiser::DenoiseReflections() + - TemporalFilter：AddTemporalAAPass() +4. RenderDeferredPlanarReflections()：合成平面反射结果。 +5. AddSkyReflectionPass() + +几种反射方式的大致执行逻辑： +- LumenReflection + 1. 输出FRDGTextureRef ReflectionsColor。 +- SSR与RT + 1. 输出结果到IScreenSpaceDenoiser::FReflectionsInputs DenoiserInputs的FRDGTextureRef Color。 + 2. 执行对应的降噪算法。 + 3. 结果赋予给FRDGTextureRef ReflectionsColor。 +- 执行完上述反射方法后，最后执行`AddSkyReflectionPass()` + +FReflectionEnvironmentSkyLightingPS位于/Engine/Private/ReflectionEnvironmentPixelShader.usf的`ReflectionEnvironmentSkyLighting()`。 \ No newline at end of file