75 lines
1.8 KiB
Markdown
75 lines
1.8 KiB
Markdown
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# Aggregate
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- **功能描述：** 指定FRigUnit里的属性引脚为可扩展连续二元运算符的运算数。
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- **使用位置：** UPROPERTY
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- **引擎模块：** RigVMStruct
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- **元数据类型：** bool
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- **限制类型：** FRigUnit下的属性
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- **常用程度：** ★★★
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指定FRigUnit里的属性引脚为可扩展连续二元运算符的运算数。
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记得在Input和Output上都加上Aggregate。
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## 测试代码：
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```cpp
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USTRUCT(meta = (DisplayName = "MyRigAggregate"))
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struct INSIDER_API FRigUnit_MyRigAggregate : public FRigUnit
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{
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GENERATED_BODY()
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RIGVM_METHOD()
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virtual void Execute() override;
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public:
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UPROPERTY(meta = (Input,Aggregate))
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float A = 0.f;
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UPROPERTY(meta = (Input,Aggregate))
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float B= 0.f;
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UPROPERTY(meta = (Output,Aggregate))
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float Result = 0.f;
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};
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```
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## 测试效果：
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可见加了Aggregate之后，在蓝图节点上就可以继续动态AddPin。在左侧的Graph上也会创建中间MyRigAggregate节点。点开后，可以看见，其实就是继续组装原始的二元运算来达成继续AddPin的效果。
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## 原理：
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识别该Meta然后然后把引脚加到AggregateInputs和AggregateOutputs里。
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```cpp
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TArray<URigVMPin*> URigVMUnitNode::GetAggregateInputs() const
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{
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TArray<URigVMPin*> AggregateInputs;
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#if UE_RIGVM_AGGREGATE_NODES_ENABLED
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if (const UScriptStruct* Struct = GetScriptStruct())
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{
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for (URigVMPin* Pin : GetPins())
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{
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if (Pin->GetDirection() == ERigVMPinDirection::Input)
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{
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if (const FProperty* Property = Struct->FindPropertyByName(Pin->GetFName()))
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{
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if (Property->HasMetaData(FRigVMStruct::AggregateMetaName))
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{
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AggregateInputs.Add(Pin);
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}
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}
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}
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}
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}
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else
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{
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return Super::GetAggregateInputs();
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}
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#endif
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return AggregateInputs;
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}
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```
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