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# Conflicts: # .obsidian/plugins/various-complements/histories.json # 03-UnrealEngine/卡通渲染相关资料/渲染功能/阴影控制/ToonShadow.md
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{"SequoiaCamShotEvalTemplate":{"SequoiaCamShotEvalTemplate":{"currentFile":{"count":1,"lastUpdated":1732609264076}}},"c++内存泄漏分析工具":{"c++内存泄漏分析工具":{"internalLink":{"count":1,"lastUpdated":1733137754779}}},"Lights":{"Lights":{"currentFile":{"count":1,"lastUpdated":1733637911876}}},"FShadowProjectionNoTransformVS（ShadowProjectionNoTransformVS）、FShadowVolumeBoundProjectionVS（ShadowVolumeBoundProjectionVS）":{"FShadowProjectionNoTransformVS（ShadowProjectionNoTransformVS）、FShadowVolumeBoundProjectionVS（ShadowVolumeBoundProjectionVS）":{"currentFile":{"count":1,"lastUpdated":1734345863513}}}}
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{"SequoiaCamShotEvalTemplate":{"SequoiaCamShotEvalTemplate":{"currentFile":{"count":1,"lastUpdated":1732609264076}}},"c++内存泄漏分析工具":{"c++内存泄漏分析工具":{"internalLink":{"count":1,"lastUpdated":1733137754779}}},"Lights":{"Lights":{"currentFile":{"count":1,"lastUpdated":1733637911876}}},"渲染屏幕空间阴影遮罩，并用于光照计算。":{"渲染屏幕空间阴影遮罩，并用于光照计算。":{"currentFile":{"count":1,"lastUpdated":1734354537396}}}}
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@ -210,13 +210,17 @@ void FSceneRenderer::InitDynamicShadows(FRHICommandListImmediate& RHICmdList, FG
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1. UnbatchedLights
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1. ShadowProjectionOnOpaque
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# ShadowDepths
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渲染阴影深度贴图与图集。
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- FSceneRenderer::RenderShadowDepthMaps()：位于CustomDepth之前。
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- **RenderVirtualShadowMaps()**
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- RenderShadowDepthMapAtlases()
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- RenderVirtualShadowMaps()
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- ***RenderShadowDepthMapAtlases()***
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- SortedShadowsForShadowDepthPass.ShadowMapCubemaps循环。渲染点光源阴影立方体图
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- **FProjectedShadowInfo::RenderDepth()**
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- **FProjectedShadowInfo::RenderTranslucencyDepths**
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RenderShadowDepthMapAtlases() 渲染的图集位于***FSceneRenderer::SortedShadowsForShadowDepthPass.ShadowMapAtlases*** (ShadowMapAtlases.RenderTargets.DepthTarget为深度，ShadowMapAtlases.Shadows 为FProjectedShadowInfo)
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## RenderDepth
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MeshDrawProcessor为***FShadowDepthPassMeshProcessor***。渲染的Shader为***ShadowDepthPixelShader.usf***
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```c++
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@ -753,84 +757,10 @@ void Main(
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#endif
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}
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```
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# Lights
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### Shader
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ShadowProjectionPixelShader.usf
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- TShadowProjectionPS：
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- TDirectionalPercentageCloserShadowProjectionPS：方向光投影
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- TSpotPercentageCloserShadowProjectionPS：SpotLight
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- FOnePassPointShadowProjectionPS(Moible?)
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### 相关函数
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- FDeferredShadingSceneRenderer::RenderLights()
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- FDeferredShadingSceneRenderer::RenderDeferredShadowProjections()
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- FSceneRenderer::RenderShadowProjections()
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- FProjectedShadowInfo::SetupFrustumForProjection()：构建阴影投影4棱椎平面信息。
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- FProjectedShadowInfo::SetupProjectionStencilMask()：
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## 其他
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顺序：
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RenderCustomDepthPass
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FSceneRenderer::CreateDynamicShadows
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=>
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FSceneRenderer::CreatePerObjectProjectedShadow
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```c++
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if (!IsForwardShadingEnabled(ShaderPlatform))
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{
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// Dynamic shadows are synced later when using the deferred path to make more headroom for tasks.
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FinishInitDynamicShadows(GraphBuilder, InitViewTaskDatas.DynamicShadows, InstanceCullingManager, ExternalAccessQueue);
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}
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```
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```c++
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if (RendererOutput == ERendererOutput::DepthPrepassOnly)
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{
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RenderOcclusionLambda();
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if (bUpdateNaniteStreaming)
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{
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Nanite::GStreamingManager.SubmitFrameStreamingRequests(GraphBuilder);
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}
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CopySceneCaptureComponentToTarget(GraphBuilder, SceneTextures, ViewFamilyTexture, ViewFamily, Views);
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}
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else
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{
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GVRSImageManager.PrepareImageBasedVRS(GraphBuilder, ViewFamily, SceneTextures);
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if (!IsForwardShadingEnabled(ShaderPlatform))
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{
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// Dynamic shadows are synced later when using the deferred path to make more headroom for tasks.
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FinishInitDynamicShadows(GraphBuilder, InitViewTaskDatas.DynamicShadows, InstanceCullingManager, ExternalAccessQueue);
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}
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// Update groom only visible in shadow
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if (IsHairStrandsEnabled(EHairStrandsShaderType::All, Scene->GetShaderPlatform()) && RendererOutput == ERendererOutput::FinalSceneColor)
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{
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UpdateHairStrandsBookmarkParameters(Scene, Views, HairStrandsBookmarkParameters);
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// Interpolation for cards/meshes only visible in shadow needs to happen after the shadow jobs are completed
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const bool bRunHairStrands = HairStrandsBookmarkParameters.HasInstances() && (Views.Num() > 0);
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if (bRunHairStrands)
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{
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RunHairStrandsBookmark(GraphBuilder, EHairStrandsBookmark::ProcessCardsAndMeshesInterpolation_ShadowView, HairStrandsBookmarkParameters);
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}
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}
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// NOTE: The ordering of the lights is used to select sub-sets for different purposes, e.g., those that support clustered deferred.
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FSortedLightSetSceneInfo& SortedLightSet = *GraphBuilder.AllocObject<FSortedLightSetSceneInfo>();
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{
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RDG_CSV_STAT_EXCLUSIVE_SCOPE(GraphBuilder, SortLights);
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RDG_GPU_STAT_SCOPE(GraphBuilder, SortLights);
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ComputeLightGridOutput = GatherLightsAndComputeLightGrid(GraphBuilder, bComputeLightGrid, SortedLightSet);
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}
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```
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# RenderLights
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渲染ScreenShadowMask，并用于光照计算。
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FDeferredShadingSceneRenderer::RenderLights()
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=>
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RDG_EVENT_SCOPE(GraphBuilder, "UnbatchedLights");//batchedLights为没有LightFunction与没有阴影的灯光。
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@ -901,10 +831,14 @@ void FDeferredShadingSceneRenderer::RenderDeferredShadowProjections(
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RenderShadowProjections():
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1. 取得当前FVisibleLightInfo、FLightSceneProxy；创建FProjectedShadowInfoArray DistanceFieldShadows、NormalShadows。
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2. 遍历VisibleLightInfo.ShadowsToProject，按照阴影特征将每个FProjectedShadowInfo加入DistanceFieldShadows、NormalShadows。
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3. 调用Lambda RenderNormalShadows()来渲染ScreenShadowMaskTexture与ScreenShadowMaskSubPixelTexture。
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3. 调用Lamda来渲染ScreenShadowMaskTexture与ScreenShadowMaskSubPixelTexture。
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4. 遍历DistanceFieldShadows，调用FProjectedShadowInfo->RenderRayTracedDistanceFieldProjection()来渲染距离场阴影。
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### FSceneRenderer::RenderShadowProjections()
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1. 初始化UniformStruct变量。
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2. 遍历传入的FProjectedShadowInfo数组，并调用**ProjectedShadowInfo->RenderProjection()** 将所有灯光的阴影Mask绘制到一张ScreenShadowMask上。
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1. 在TShadowProjectionPS中通过SetParameters() => ProjectionParameters.Set()，来设置ShadowDepthTextureValue。`ShadowDepthTextureValue = ShadowInfo->RenderTargets.DepthTarget->GetRHI();`
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```c++
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void FSceneRenderer::RenderShadowProjections(
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FRDGBuilder& GraphBuilder,
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@ -986,8 +920,24 @@ void FSceneRenderer::RenderShadowProjections(
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- TShadowProjectionFromTranslucencyPS
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- TDirectionalPercentageCloserShadowProjectionPS
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- TModulatedShadowProjection
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- ShadowProjectionCommon.ush
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- ShadowDepthTexture
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- ShadowDepthCubeTexture
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主要步骤：
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1. 将SceneDepth（ScreenSpace） =>（ShadowSpace）
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2. 根据过滤方式调用：
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1. 不过滤：`Shadow = LightSpacePixelDepthForOpaque < Texture2DSampleLevel(ShadowDepthTexture, ShadowDepthTextureSampler, ShadowPosition.xy, 0).r;`
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2. PCSS：初始化FPCSSSamplerSettings之后调用DirectionalPCSS()
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3. PCF：初始化FPCFSamplerSettings之后调用ManualPCF()
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3. 调整阴影数值。钳制、模糊、过滤。
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4. `OutColor = EncodeLightAttenuation(half4(FadedShadow, FadedSSSShadow, FadedShadow, FadedSSSShadow));`LinearSpace => sRGB 本质为sqrt(input)，比pow(x, 1/2.2) 节约性能。
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## 总结
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1. RenderDepth()渲染完深度贴图之后，经过GatherAndSortLights()、ComputeLightGrid()获取到经过剪裁的FSortedLightSetSceneInfo &SortedLightSet，之后传递给RenderLights()。
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2. BindShadowProjectionShaders() => BindShaderShaders() =>
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3. TShadowProjectionPS => ProjectionParameters.Bind(Initializer); => ShadowDepthTexture.Bind(ParameterMap,TEXT("ShadowDepthTexture"));
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PS. 向往Blog： 以上可知，对ScreenShadowMaskTexture执行绘制时，是在屏幕空间进行的，并且ScreenShadowMask会被叠加多次（视光源的阴影实例个数而定），不同的通道存储了不同类型的阴影信息。
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## RenderLight()
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```c++
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@ -1060,9 +1010,11 @@ PS.很有可能需要创建2个Atlas。Atlas的创建位于***FSceneRenderer::Al
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//此阶段需要屏蔽角色投射到自己的非半程阴影
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//和角色投射到场景中会跟随视角移动的阴影
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```c++
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if(Toon材质,且没有程阴影Flag的阴影
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if(Toon材质,且没有半程阴影Flag的阴影
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&&非Toon材质但有半程阴影Flag的阴影)
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{
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屏蔽此阴影
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}
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```
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PS.很有可能在FProjectedShadowInfo::RenderProjection()阶段进行判断以此保证合成正确的**ScreenShadowMask**。
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