77 lines
2.2 KiB
Markdown
77 lines
2.2 KiB
Markdown
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# Private
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- **功能描述：** 标识该UMaterialExpression为私有节点，当前在材质蓝图右键菜单中隐藏。
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- **使用位置：** UCLASS
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- **引擎模块：** Material
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- **元数据类型：** bool
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- **限制类型：** UMaterialExpression子类
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- **常用程度：** ★
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标识该UMaterialExpression为私有节点，当前在材质蓝图右键菜单中隐藏。
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在MaterialX模块中使用，目前是把里面的Expression暂时先都隐藏起来。
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## 源码例子：
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```cpp
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UCLASS()
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class UMyMaterialExpression_NotPrivate : public UMaterialExpression
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{}；
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UCLASS(meta=(Private))
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class UMyMaterialExpression_Private : public UMaterialExpression
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{}；
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```
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## 测试效果：
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材质蓝图里只能调用UMyMaterialExpression_NotPrivate 。
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## 原理：
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在遍历所有可用FMaterialExpression的时候，如果有Private则略过。
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```cpp
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static TAutoConsoleVariable<int32> CVarMaterialEnableNewHLSLGenerator(
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TEXT("r.MaterialEnableNewHLSLGenerator"),
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0,
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TEXT("Enables the new (WIP) material HLSL generator.\n")
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TEXT("0 - Don't allow\n")
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TEXT("1 - Allow if enabled by material\n")
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TEXT("2 - Force all materials to use new generator\n"),
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ECVF_RenderThreadSafe | ECVF_ReadOnly);
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void MaterialExpressionClasses::InitMaterialExpressionClasses()
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{
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static const auto CVarMaterialEnableNewHLSLGenerator = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.MaterialEnableNewHLSLGenerator"));
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const bool bEnableControlFlow = AllowMaterialControlFlow();
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const bool bEnableNewHLSLGenerator = CVarMaterialEnableNewHLSLGenerator->GetValueOnAnyThread() != 0;
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for( TObjectIterator<UClass> It ; It ; ++It )
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{
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if( Class->IsChildOf(UMaterialExpression::StaticClass()) )
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{
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// Hide node types related to control flow, unless it's enabled
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if (!bEnableControlFlow && Class->HasMetaData("MaterialControlFlow"))
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{
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continue;
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}
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if (!bEnableNewHLSLGenerator && Class->HasMetaData("MaterialNewHLSLGenerator"))
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{
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continue;
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}
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// Hide node types that are tagged private
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if(Class->HasMetaData(TEXT("Private")))
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{
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continue;
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}
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AllExpressionClasses.Add(MaterialExpression);
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}
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}
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}
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```
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