vault backup: 2025-01-20 16:27:47

.obsidian/plugins/various-complements/histories.json

@@ -1 +1 @@
-{"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}}},"DecodeLightAttenuation":{"DecodeLightAttenuation":{"currentFile":{"count":1,"lastUpdated":1734406452310}}},"clamped":{"clamped":{"currentFile":{"count":1,"lastUpdated":1734590559877}}},"R失效判定：":{"R失效判定：":{"currentFile":{"count":1,"lastUpdated":1734935678402}}}}
+{"R失效判定：":{"R失效判定：":{"currentFile":{"count":1,"lastUpdated":1734935678402}}},"c++内存泄漏分析工具":{"c++内存泄漏分析工具":{"internalLink":{"count":1,"lastUpdated":1737361366503}}}}

03-UnrealEngine/卡通渲染相关资料/渲染功能/阴影控制/ToonShadow.md

@@ -91,30 +91,89 @@ PS.很有可能在FProjectedShadowInfo::RenderProjection()阶段进行判断以
 ```c++
 const FMaterialRenderProxy* MaterialRenderProxy = MeshBatch.MaterialRenderProxy;  
 bool bEnableToonMeshDrawOutline = MaterialRenderProxy->GetToonOutlineDataAssetRT()->Settings.bEnableToonMeshDrawOutline;
-
 ```
 FProjectedShadowInfo->Scene
 FPrimitiveSceneProxy
 ## 深度偏移
-### 方法一
+### ~~方法一~~
 1. FProjectedShadowInfo添加变量。
 FSceneRenderer::RenderShadowDepthMaps() => RenderShadowDepthMapAtlases() => ProjectedShadowInfo->RenderDepth()
 
 已放弃，FProjectedShadowInfo无法判断MeshSection。
-### 方法二
+### 方法二（最终实现方法）
 在材质中使用ShadowPassSwitch再对ViewSpace的Z轴方向（使用DirectionalLightVector比较可以只对方向光进行偏移）进行WPO偏移实现。
 
 其优点就是可以用贴图来控制偏移过渡。
 
 ## DirectionOffsetToViewShadow
-1. 在FProjectedShadowInfo添加变量。
-FSceneRenderer::CreateDynamicShadows() => SetupInteractionShadows()，在CreatePerObjectProjectedShadow()添加相关逻辑。
+### 最终实现方法
+1. 在**FProjectionShadowInfo**中添加**bDirectionOffsetToViewShadow**标记以及对应的判断函数IsDirectionOffsetToViewShadow()来判断是否是DirectionOffsetToViewShadow。
+	1. 在**FSceneRenderer::CreatePerObjectProjectedShadow()** 中再次调用SetupPerObjectProjection()逻辑创建**DirectionOffsetToViewShadow**时将FProjectedShadowInfo的***bDirectionOffsetToViewShadow设置成true***。
+2. 在PrimitiveSceneProxy.h 中添加DirectionOffsetToViewShadowAlpha变量作为偏移Alpha，同事添加函数UseDirectionOffsetToViewShadow()来判断是否开启这个功能。
+	1. 在**FSceneRenderer::CreatePerObjectProjectedShadow()** 中取得PrimitiveSceneProxy中的DirectionOffsetToViewShadowAlpha，最后计算向量来设置***ShadowInitializer.WorldToLight***。大致为[[#DirectionOffsetToViewShadow Direction Code]]
+3. 在ToonDataAsset中添加RecivedViewOffsetShadow作为是否接收DirectionOffsetToViewShadow的依据。
+	1. 将数据渲染到ToonDataAsset Texture中。
+	2. 最终在ShadowProjectionPixelShader.usf获取并且计算。代码如下：
 
-CreatePerObjectProjectedShadow() => ProjectedPreShadowInfo->SetupPerObjectProjection
-- GetBestShadowTransform()
+```c++
+	//BlueRose Modify
+#if SHADING_PATH_DEFERRED && !FORWARD_SHADING && !SUBPIXEL_SHADOW && !STRATA_ENABLED /*&& !USE_TRANSMISSION*/
+	FGBufferData GBufferData_Toon = GetGBufferData(ScreenUV);
+	const uint ToonDataAssetID = GetToonDataAssetIDFromGBuffer(GBufferData_Toon);
+	float RecivedViewOffsetShadow = GetRecivedViewOffsetShadow(ToonDataAssetID);
+	
+	if (IsDirectionOffsetToViewShadow > 0)//ViewShadow ProjectionShadowInfo
+	{
+		/*if (RecivedViewOffsetShadow > 0)//ViewOffsetShadow
+		{
+			PerObjectDistanceFadeFraction *= 1.0;
+		}*/
+		if (RecivedViewOffsetShadow == 0)
+		{
+			PerObjectDistanceFadeFraction *= 0.0;
+		}
+	}else//Normal ProjectionShadowInfo
+	{
+		if (RecivedViewOffsetShadow > 0)
+		{
+			PerObjectDistanceFadeFraction *= 0.0;
+		}
+	}
+#endif
+	//BlueRose Modify End
+	float FadedShadow = lerp(1.0f, Shadow, ShadowFadeFraction * PerObjectDistanceFadeFraction);
 
-### 思路一
-ENGINE_API virtual void PreEditChange(FProperty* PropertyAboutToChange) override;  
-ENGINE_API virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;  
-ENGINE_API virtual bool CanEditChange(const FProperty* InProperty) const override;  
-ENGINE_API virtual bool Modify(bool bAlwaysMarkDirty = true) override;
+#if FORWARD_SHADING || SHADING_PATH_MOBILE 
+	float LightInfluenceMask = GetLightInfluenceMask(TranslateWorldPosition);
+	// Constrain shadowing from this light to pixels inside the light's influence, since other non-overlapping lights are packed into the same channel
+	FadedShadow = lerp(1, FadedShadow, LightInfluenceMask);
+	// Write into all channels, the write mask will constrain to the correct one
+	OutColor = EncodeLightAttenuation(FadedShadow);
+#else
+	float FadedSSSShadow = lerp(1.0f, SSSTransmission, ShadowFadeFraction * PerObjectDistanceFadeFraction);
+
+	// the channel assignment is documented in ShadowRendering.cpp (look for Light Attenuation channel assignment)
+	OutColor = EncodeLightAttenuation(half4(FadedShadow, FadedSSSShadow, FadedShadow, FadedSSSShadow));
+#endif
+```
+#### DirectionOffsetToViewShadow Direction Code
+```c++
+...
+bool bToonDirectionOffsetToViewShadow = ToonDirectionOffsetToViewShadowCVar->GetValueOnRenderThread();
+float LightViewBlendFactor = PrimitiveSceneInfo->Proxy->DirectionOffsetToViewShadowAlpha;
+if (bToonDirectionOffsetToViewShadow && LightSceneInfo->Proxy->GetLightType() == LightType_Directional && LightViewBlendFactor > 0.0f)
+{
+	//计算半程向量，针对每个View都会生成一个FProjectedShadowInfo，之后在RenderShadowProjection()中判断？
+	for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
+	{
+		const FViewInfo& View = Views[ViewIndex];
+		const FMatrix& ViewMatrix = View.ShadowViewMatrices.GetViewMatrix();
+		FVector LightDirection = LightSceneInfo->Proxy->GetDirection();
+		const FVector CameraDirection = ViewMatrix.GetColumn(2).GetSafeNormal();
+		FVector HalfViewLightDir = (LightDirection * ( 1 - LightViewBlendFactor) + CameraDirection * LightViewBlendFactor).GetSafeNormal();
+		FMatrix FinalCombineMatrix = FInverseRotationMatrix(HalfViewLightDir.Rotation());
+		ShadowInitializer.WorldToLight = FinalCombineMatrix;
+	...
+	}
+}
+```