vault backup: 2025-03-25 00:13:21
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{"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}}}}
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{"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}}}}
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@ -12,6 +12,7 @@ rating: ⭐
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- LumenReflections
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- [[#DiffuseIndirectComposite]]
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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）。
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## ReflectionEnvironmentAndSky
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位于IndirectLightRendering.cpp的RenderDeferredReflectionsAndSkyLighting() => `AddSkyReflectionPass()`
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@ -289,6 +290,7 @@ float3 ReflectionEnvironment(FGBufferData GBuffer, float AmbientOcclusion, float
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```
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### GatherRadiance()
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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。
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```c++
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float3 GatherRadiance(float CompositeAlpha, float3 TranslatedWorldPosition, float3 RayDirection, float Roughness, float3 BentNormal, float IndirectIrradiance, uint ShadingModelID, uint NumCulledReflectionCaptures, uint CaptureDataStartIndex)
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{
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@ -319,7 +321,7 @@ float3 GatherRadiance(float CompositeAlpha, float3 TranslatedWorldPosition, floa
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}
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```
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主要逻辑位于CompositeReflectionCapturesAndSkylightTWS():
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```c++
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float3 CompositeReflectionCapturesAndSkylightTWS(
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float CompositeAlpha,
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@ -341,20 +343,22 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
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#if REFLECTION_COMPOSITE_USE_BLENDED_REFLECTION_CAPTURES
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// Accumulate reflections from captures affecting this tile, applying largest captures first so that the smallest ones display on top
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//ReflectionCapture Blend，其顺序为大范围在前
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LOOP
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for (uint TileCaptureIndex = 0; TileCaptureIndex < NumCapturesAffectingTile; TileCaptureIndex++)
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{
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BRANCH
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if (ImageBasedReflections.a < 0.001)
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if (ImageBasedReflections.a < 0.001)//如果Alpha小于0.001则停止循环，结束合成计算。
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{
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break;
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}
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//计算CaptureIndex
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uint CaptureIndex = 0;
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#ifdef REFLECTION_COMPOSITE_NO_CULLING_DATA
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CaptureIndex = TileCaptureIndex; // Go from 0 to NumCapturesAffectingTile as absolute index in capture array
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#else
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#if (INSTANCED_STEREO || MOBILE_MULTI_VIEW)
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#if (INSTANCED_STEREO || MOBILE_MULTI_VIEW)//VR或者移动端多View
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BRANCH
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if (EyeIndex == 0)
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{
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@ -382,7 +386,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
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float NormalizedDistanceToCapture = saturate(CaptureVectorLength / CaptureRadius);
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BRANCH
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if (CaptureVectorLength < CaptureRadius)
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if (CaptureVectorLength < CaptureRadius)//当前像素处于ReflectionCapture范围内
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{
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float3 ProjectedCaptureVector = RayDirection;
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float4 CaptureOffsetAndAverageBrightness = GetReflectionCaptureOffsetAndAverageBrightness(CaptureIndex);
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@ -392,6 +396,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
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#define PROJECT_ONTO_SHAPE 1
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#if PROJECT_ONTO_SHAPE
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//盒形反射球
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#if REFLECTION_COMPOSITE_HAS_BOX_CAPTURES
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#if REFLECTION_COMPOSITE_HAS_SPHERE_CAPTURES
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// Box
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@ -403,6 +408,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
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}
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#endif
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//球形反射球
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#if REFLECTION_COMPOSITE_HAS_SPHERE_CAPTURES
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// Sphere
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#if REFLECTION_COMPOSITE_HAS_BOX_CAPTURES
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@ -419,6 +425,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
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float CaptureArrayIndex = CaptureProperties.g;
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{
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//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。
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float4 Sample = ReflectionStruct.ReflectionCubemap.SampleLevel(ReflectionStruct.ReflectionCubemapSampler, float4(ProjectedCaptureVector, CaptureArrayIndex), Mip);
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Sample.rgb *= CaptureProperties.r;
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@ -436,7 +443,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
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}
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#else
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//非ReflectionCapture Blend
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float3 ProjectedCaptureVector = RayDirection;
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FLWCVector3 SingleCaptureWorldPosition = MakeLWCVector3(GetReflectionTilePosition(SingleCaptureIndex).xyz, GetReflectionPositionAndRadius(SingleCaptureIndex).xyz);
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@ -483,6 +490,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
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{
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float SkyAverageBrightness = 1.0f;
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// 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);
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#if REFLECTION_COMPOSITE_SUPPORT_SKYLIGHT_BLEND
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float3 SkyLighting = GetSkyLightReflectionSupportingBlend(RayDirection, Roughness, SkyAverageBrightness);
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#else
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@ -518,3 +526,59 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
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## DiffuseIndirectComposite
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位于IndirectLightRendering.cpp的`RenderDiffuseIndirectAndAmbientOcclusion()`
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`RenderDiffuseIndirectAndAmbientOcclusion()`主要执行了：
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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）
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2. SetupCommonDiffuseIndirectParameters()
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3. 计算GI
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- ScreenSpaceGI
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- RTGI
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- Lumen
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- Lumen Reflection：输出结果到OutTextures.Textures[3]。
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- SSR：输出结果到OutTextures.Textures[3]。
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- 其他Reflection：结果输出为黑色。
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4. 使用降噪器对SSGI与RTGI进行降噪
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5. 渲染AO
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- 禁用
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- RTAO
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- SSAO
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- 其他没有实现的会谈报错提醒
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6. 将渲染的AO结果赋予SceneTextures.ScreenSpaceAO
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7. RenderHairStrandsAmbientOcclusion()
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8.
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位于IndirectLightRendering.cpp的RenderDeferredReflectionsAndSkyLighting() => `AddSkyReflectionPass()`
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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。
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不开启Lumen GI，反射方法为：
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- Lumen：`RenderLumenReflections()`
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- RT Reflection：`RenderRayTracingReflections()`
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- SSR：`ScreenSpaceRayTracing::RenderScreenSpaceReflections()`
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`RenderDeferredReflectionsAndSkyLighting()`主要执行了：
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1. SkyLightDiffuse
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1. RenderDistanceFieldLighting()
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1. RenderDistanceFieldAOScreenGrid()：渲染距离场AO。
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2. RenderCapsuleShadowsForMovableSkylight()：渲染胶囊阴影。
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2. ReflectionIndirect
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- RenderLumenReflections()
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- RenderRayTracingReflections()
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- RenderScreenSpaceReflections()
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3. Denoise
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- Denoiser：IScreenSpaceDenoiser::DenoiseReflections()
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- TemporalFilter：AddTemporalAAPass()
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4. RenderDeferredPlanarReflections()：合成平面反射结果。
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5. AddSkyReflectionPass()
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几种反射方式的大致执行逻辑：
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- LumenReflection
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1. 输出FRDGTextureRef ReflectionsColor。
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- SSR与RT
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1. 输出结果到IScreenSpaceDenoiser::FReflectionsInputs DenoiserInputs的FRDGTextureRef Color。
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2. 执行对应的降噪算法。
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3. 结果赋予给FRDGTextureRef ReflectionsColor。
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- 执行完上述反射方法后，最后执行`AddSkyReflectionPass()`
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FReflectionEnvironmentSkyLightingPS位于/Engine/Private/ReflectionEnvironmentPixelShader.usf的`ReflectionEnvironmentSkyLighting()`。
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