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03-UnrealEngine/Rendering/RenderFeature/ShaderWorldPlugin/ShaderWorld.md
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@ -57,14 +57,34 @@ MatDyn？
- UpdateStaticDataFor
- ComputeHeight_Segmented_MapForClipMap：似乎会设置
- UpdateCollisionMeshData
- InitializeReadBackDependencies
- InitiateMaterials
- [x] [[#InitializeReadBackDependencies]]
- [x] InitiateMaterials
### UpdateCollisionMeshData
Tick() -> CollisionManagement() -> CollisionGPU() -> UpdateCollisionMeshData()
### ComputeHeight_Segmented_MapForClipMap
### InitializeReadBackDependencies
BeginPlay() -> InitiateWorld() -> InitializeReadBackDependencies()
1. 初始化3个RT：ReadRequestLocation、ReadRequestLocationHeightmap、GeneratorDynamicForReadBack。
2. 会设置`TObjectPtr < UMaterialInstanceDynamic> GeneratorDynamicForReadBack`各种变量
```c++
GeneratorDynamicForReadBack->SetScalarParameterValue("HeightReadBack", 1.f);
GeneratorDynamicForReadBack->SetTextureParameterValue("SpecificLocationsRT", ReadRequestLocation);
GeneratorDynamicForReadBack->SetScalarParameterValue("NoMargin", 0.f);
GeneratorDynamicForReadBack->SetScalarParameterValue("N", N);
GeneratorDynamicForReadBack->SetScalarParameterValue("NormalMapSelect", 0.f);
GeneratorDynamicForReadBack->SetScalarParameterValue("HeightMapToggle", 1.f);
```
3. 设置随机种子相关Shader Parameter。
### InitiateMaterials
初始化`TArray<FClipMapMeshElement> Meshes;`的Material、`Producers`
BeginPlay() -> InitiateWorld() -> InitiateMaterials()
作用：初始化`TArray<FClipMapMeshElement> Meshes;`的Material、`Producers`
调用顺序：BeginPlay() -> InitiateWorld() -> InitiateMaterials()
经过断点调试，会设置WorldSettings里的Material（地形Material）的HeightMap与NormalMap。