vault backup: 2025-03-25 00:13:21

.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}}}}
+{"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}}}}

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
@@ -403,6 +408,7 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
 					}
 				#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
@@ -518,3 +526,59 @@ float3 CompositeReflectionCapturesAndSkylightTWS(
 
 ## DiffuseIndirectComposite
 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()`。