vault backup: 2024-10-12 17:19:45

03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/Enum/UMETA/TraceQuery.md

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+# TraceQuery
+
+- **功能描述：** Enum /Script/Engine.ECollisionChannel
+- **使用位置：** UENUM::UMETA
+- **引擎模块：** Enum Property
+- **元数据类型：** bool
+- **常用程度：** 0
+
+只在ECollisionChannel 上使用，指定哪些通道是用来Trace的。
+
+## 源码例子：
+
+```cpp
+UENUM(BlueprintType)
+enum ECollisionChannel : int
+{
+
+	ECC_WorldStatic UMETA(DisplayName="WorldStatic"),
+	ECC_WorldDynamic UMETA(DisplayName="WorldDynamic"),
+	ECC_Pawn UMETA(DisplayName="Pawn"),
+	ECC_Visibility UMETA(DisplayName="Visibility" , TraceQuery="1"),
+	ECC_Camera UMETA(DisplayName="Camera" , TraceQuery="1"),
+	ECC_PhysicsBody UMETA(DisplayName="PhysicsBody"),
+	ECC_Vehicle UMETA(DisplayName="Vehicle"),
+	ECC_Destructible UMETA(DisplayName="Destructible"),
+
+	/** Reserved for gizmo collision */
+	ECC_EngineTraceChannel1 UMETA(Hidden),
+
+	ECC_EngineTraceChannel2 UMETA(Hidden),
+	ECC_EngineTraceChannel3 UMETA(Hidden),
+	ECC_EngineTraceChannel4 UMETA(Hidden), 
+	ECC_EngineTraceChannel5 UMETA(Hidden),
+	ECC_EngineTraceChannel6 UMETA(Hidden),
+
+	ECC_GameTraceChannel1 UMETA(Hidden),
+	ECC_GameTraceChannel2 UMETA(Hidden),
+	ECC_GameTraceChannel3 UMETA(Hidden),
+	ECC_GameTraceChannel4 UMETA(Hidden),
+	ECC_GameTraceChannel5 UMETA(Hidden),
+	ECC_GameTraceChannel6 UMETA(Hidden),
+	ECC_GameTraceChannel7 UMETA(Hidden),
+	ECC_GameTraceChannel8 UMETA(Hidden),
+	ECC_GameTraceChannel9 UMETA(Hidden),
+	ECC_GameTraceChannel10 UMETA(Hidden),
+	ECC_GameTraceChannel11 UMETA(Hidden),
+	ECC_GameTraceChannel12 UMETA(Hidden),
+	ECC_GameTraceChannel13 UMETA(Hidden),
+	ECC_GameTraceChannel14 UMETA(Hidden),
+	ECC_GameTraceChannel15 UMETA(Hidden),
+	ECC_GameTraceChannel16 UMETA(Hidden),
+	ECC_GameTraceChannel17 UMETA(Hidden),
+	ECC_GameTraceChannel18 UMETA(Hidden),
+	
+	/** Add new serializeable channels above here (i.e. entries that exist in FCollisionResponseContainer) */
+	/** Add only nonserialized/transient flags below */
+
+	// NOTE!!!! THESE ARE BEING DEPRECATED BUT STILL THERE FOR BLUEPRINT. PLEASE DO NOT USE THEM IN CODE
+
+	ECC_OverlapAll_Deprecated UMETA(Hidden),
+	ECC_MAX,
+};
+```
+
+## 原理：
+
+```cpp
+void UCollisionProfile::LoadProfileConfig(bool bForceInit)
+{
+		static const FString TraceType = TEXT("TraceQuery");
+}
+```