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

@@ -827,3 +827,52 @@ if (RendererOutput == ERendererOutput::DepthPrepassOnly)
 			ComputeLightGridOutput = GatherLightsAndComputeLightGrid(GraphBuilder, bComputeLightGrid, SortedLightSet);
 		}
 ```
+
+
+# 半程阴影
+由晨风&Neverwind提出：
+- 【[UFSH2024]用虚幻引擎5为《幻塔》定制高品质动画流程风格化渲染管线 | 晨风 Neverwind 完美世界游戏】 【精准空降到 07:27】 https://www.bilibili.com/video/BV1rW2LYvEox/?share_source=copy_web&vd_source=fe8142e8e12816535feaeabd6f6cdc8e&t=447
+
+**阴影Setup阶段**:
+```c++
+if 启用半程阴影:
+{
+	额外进行一次CreatePerObjectProjectedShadow()
+	{
+		处理阴影光照Matrix
+		向阴影信息写入IsHalfViewShadowFlag
+		用新的光源方向画Atlas
+	}
+}
+```
+
+**阴影Projection阶段**:
+//此阶段需要屏蔽角色投射到自己的非半程阴影
+//和角色投射到场景中会跟随视角移动的阴影
+```c++
+if(Toon材质,且没有程阴影Flag的阴影
+&&非Toon材质但有半程阴影Flag的阴影)
+{
+	屏蔽此阴影
+}
+```
+
+截图代码：
+```c++
+if(PrimitiveSceneinfo->Proxy->IsToonDisableSelfShadow())
+{
+...
+	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).GetSafeNonmal()
+		float LightViewBlendFactor = PrimitiveSceneinfo->Proxy->GetToonHalfVienShadowFactor();
+		Fvector HalfViewLightDir = (LightDirection + ( 1 - LightViewBlendFactor) + CameraDirection * LightViewBlendFactor).GetSafeNormal();
+		FMatrix FinalCombineMatrix = FNnverseRotationMatrix(HalfViewLightDir.Rotation())
+		ShadowInitializer.WorldTolight = FinalCombineMatrix;
+	}
+...
+ }
+```