2024-09-25 17:05:44 +08:00
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---
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title: Untitled
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date: 2024-09-25 14:59:32
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excerpt:
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tags:
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rating: ⭐
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---
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# 前言
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可以使用DrawDynamicMeshPass()，实现在插件中使用MeshDraw绘制Pass。
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参考文章：
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- ***UE5，为HairStrands添加自定义深度与模板***:https://zhuanlan.zhihu.com/p/689578355
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2024-09-25 19:00:15 +08:00
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# MeshDraw
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2024-09-30 16:06:38 +08:00
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推荐学习：
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- CustomDepth
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- RenderBasePassInternal()
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- RenderAnisotropyPass()
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2024-09-25 19:00:15 +08:00
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Shader推荐：
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- DepthOnlyVertexShader.usf
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- DepthOnlyPixelShader.usf
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2024-09-25 17:05:44 +08:00
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# NaniteMeshDraw
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`Engine\Source\Runtime\Renderer\Private\Nanite\`NaniteMaterials.h & NaniteMaterials.cpp
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PS.使用的Shader必须是`FNaniteGlobalShader`的子类。
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## BasePass
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### DrawBasePass()
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该函数在FDeferredShadingSceneRenderer::RenderBasePassInternal()中调用。
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2024-09-25 17:54:03 +08:00
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DrawNaniteMaterialPass() => SubmitNaniteIndirectMaterial()
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2024-09-25 17:05:44 +08:00
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## DepthStencil
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### InitCustomDepthStencilContext()
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根据当前平台是否支持使用ComputeShader直接输出结果（bComputeExport）、以及是否写入Stencil缓存，以此来创建不同的资源。最终输出FCustomDepthContext。
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```c++
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struct FCustomDepthContext
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{
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FRDGTextureRef InputDepth = nullptr;
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FRDGTextureSRVRef InputStencilSRV = nullptr;
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FRDGTextureRef DepthTarget = nullptr;
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FRDGTextureRef StencilTarget = nullptr;
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bool bComputeExport = true;
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};
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```
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### EmitCustomDepthStencilTargets()
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根据bComputeExport，分别使用RDG的ComputeShader与PixelShader输出DepthStencil。
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- CS使用FComputeShaderUtils::AddPass()
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- PS使用NaniteExportGBuffer.usf的**EmitCustomDepthStencilPS()**，FPixelShaderUtils::AddFullscreenPass()
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以**FEmitCustomDepthStencilPS**(NaniteExportGBuffer.usf)为例，额外输入的Nanite相关变量：
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- FSceneUniformParameters Scene
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- StructuredBuffer`<`FPackedView`>` InViews
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- ByteAddressBuffer VisibleClustersSWHW？
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- FIntVector4, PageConstants
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- Texture2D`<`UlongType`>`, VisBuffer64
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- ByteAddressBuffer MaterialSlotTable
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### FinalizeCustomDepthStencil()
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2024-09-30 13:14:28 +08:00
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替换输出的Depth&Stencil。
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# FViewInfo
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FViewInfo& ViewInfo
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- WriteView.bSceneHasSkyMaterial |= bSceneHasSkyMaterial;
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- WriteView.bHasSingleLayerWaterMaterial |= bHasSingleLayerWaterMaterial;
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- WriteView.bHasCustomDepthPrimitives |= bHasCustomDepthPrimitives;
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- WriteView.bHasDistortionPrimitives |= bHasDistortionPrimitives;
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- WriteView.bUsesCustomDepth |= bUsesCustomDepth;
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- WriteView.bUsesCustomStencil |= bUsesCustomStencil;
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- FRelevancePacket::Finalize()
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-
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