vault backup: 2024-12-19 11:48:29

03-UnrealEngine/Rendering/RenderingPipeline/Materials&MeshDraw/MeshDraw.md

@@ -321,6 +321,7 @@ bool FSceneRenderer::RenderCustomDepthPass(
 		SharedContext.Pipeline = Nanite::EPipeline::Primary;
 
 		// TODO: If !bWriteCustomStencil, we could copy off the depth and rasterize depth-only (probable optimization)
+		//初始化Nanite::FRasterContext RasterContext。
 		Nanite::FRasterContext RasterContext = Nanite::InitRasterContext(
 			GraphBuilder,
 			SharedContext,
@@ -336,12 +337,13 @@ bool FSceneRenderer::RenderCustomDepthPass(
 			true // bCustomPass
 		);
 
+		//用于构建FCustomDepthContext结构体，创建对应的贴图资源。主要包含了InputDepth、InputStencilSRV、DepthTarget、StencilTarget以及bComputeExport（是否使用ComputeShader输出）。
 		Nanite::FCustomDepthContext CustomDepthContext = Nanite::InitCustomDepthStencilContext(
 			GraphBuilder,
 			CustomDepthTextures,
 			bWriteCustomStencil);
 
-		Nanite::FConfiguration CullingConfig = { 0 };
+		Nanite::FConfiguration CullingConfig = { 0 };//Nanite剔除设置，用的较多的是bUpdateStreaming、bPrimaryContext、bTwoPassOcclusion，设置为true。
 		CullingConfig.bUpdateStreaming = true;
 
 		for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ++ViewIndex)
@@ -355,6 +357,7 @@ bool FSceneRenderer::RenderCustomDepthPass(
 				continue;
 			}
 
+			//创建Nanite渲染器
 			auto NaniteRenderer = Nanite::IRenderer::Create(
 				GraphBuilder,
 				*Scene,
@@ -397,12 +400,14 @@ bool FSceneRenderer::RenderCustomDepthPass(
 ```
 
 - Nanite::InitRasterContext()：初始化Nanite::FRasterContext RasterContext。
-- Nanite::InitCustomDepthStencilContext()：位于NaniteMaterials.cpp，用于构建FCustomDepthContext结构体，主要包含了InputDepth、InputStencilSRV、DepthTarget、StencilTarget以及bComputeExport（是否使用ComputeShader输出）。
+- Nanite::InitCustomDepthStencilContext()：位于NaniteMaterials.cpp，用于构建FCustomDepthContext结构体，创建对应的贴图资源。主要包含了InputDepth、InputStencilSRV、DepthTarget、StencilTarget以及bComputeExport（是否使用ComputeShader输出）。
+- auto NaniteRenderer = Nanite::IRenderer::Create()：创建Nanite渲染器
+- NaniteRenderer->DrawGeometry()：Nanite物体绘制
+- NaniteRenderer->ExtractResults( RasterResults )：提取渲染结果。
+- ***Nanite::EmitCustomDepthStencilTargets()***：使用提取到的Nanite::FRasterResults RasterResults，输出CustomDepth。结果存储在 FCustomDepthContext& CustomDepthContext中。
+	- FDepthExportCS / FEmitCustomDepthStencilPS
+- Nanite::FinalizeCustomDepthStencil()：将CustomDepthContext中的结果输出到CustomDepthTextures上。
 
-## NaniteRenderer
-1. auto NaniteRenderer = Nanite::IRenderer::Create()
-2. NaniteRenderer->DrawGeometry
-3. NaniteRenderer->ExtractResults( RasterResults );
-4. Nanite::EmitCustomDepthStencilTargets()
-
-## Nanite::FinalizeCustomDepthStencil()
+## BasePass Nanite
+1. Render()中向RenderBasePass()传入const TArrayView<Nanite::FRasterResults>& NaniteRasterResults。
+2. 调用Lambda RenderNaniteBasePass()，本质上是调用Nanite::DrawBasePass()进行渲染。