World.h 库里的 Trace API

Trace模式
- TraceSingle 单个结果
- TraceMulti 多个结果
Trace 的检测依据
- ByChanne
- ByObjectType
- ByProfile

LineTraceSingleByChannel

由于一般不使用 World 里的Trace API，故本小结只举 LineTraceSingleByChannel 一个例子

Syntax

bool LineTraceSingleByChannel(

	struct FHitResult& OutHit,

	const FVector& Start,

	const FVector& End,

	ECollisionChannel TraceChannel,

	const FCollisionQueryParams& Params = FCollisionQueryParams::DefaultQueryParam,

	const FCollisionResponseParams& ResponseParam = FCollisionResponseParams::DefaultResponseParam

) const;

代码实现

// 碰撞参数

FCollisionQueryParams CollisonQueryParams(TEXT("QueryParams"),true,NULL);

CollisonQueryParams.bTraceComplex = true;

CollisonQueryParams.bReturnPhysicalMaterial = false;

CollisonQueryParams.AddIgnoredActor(this);

// 起始点和检测结果

FVector BeginLoc = GetActorLocation();

FVector EndLoc = BeginLoc + GetActorForwardVector() * 1000;

FHitResult HitResult;

// 射线检测

GetWorld()->LineTraceSingleByChannel(HitResult, BeginLoc, EndLoc, ECollisionChannel::ECC_Visibility, CollisonQueryParams);

// 绘制射线

DrawDebugLine(GetWorld(), BeginLoc, HitResult.GetActor() ? HitResult.Location : EndLoc, FColor::Red, false, 1.0f);

if (HitResult.GetActor())

{

	UKismetSystemLibrary::PrintString(GetWorld(), HitResult.GetActor()->GetName());

}

UKismetSystemLibrary 库里的 Trace API

与蓝图使用的 Trace 节点对应，
实际调用的是 World.h 里的 Trace 函数

LineTrace

LineTraceSingle

根据 Channel 检测单个物体

Syntax

static bool LineTraceSingle(

	const UObject* WorldContextObject,

	const FVector Start,

	const FVector End,

	ETraceTypeQuery TraceChannel,

	bool bTraceComplex,

	const TArray<AActor*>& ActorsToIgnore,

	EDrawDebugTrace::Type DrawDebugType,

	FHitResult& OutHit,

	bool bIgnoreSelf,

	FLinearColor TraceColor = FLinearColor::Red,

	FLinearColor TraceHitColor = FLinearColor::Green,

	float DrawTime = 5.0f

);

ETraceTypeQuery 说明
- 默认 TraceTypeQuery1 —— Visibility
- 默认 TraceTypeQuery2 —— Camera
- 可在 ProjectSettings->Engine->Collision->Trace Channels 添加自定义

代码实现

// 起始点和检测结果

FVector BeginLoc = GetActorLocation();

FVector EndLoc = BeginLoc + GetActorForwardVector() * 1000;

FHitResult HitResult;

// 要忽略的物体

TArray<AActor*> IgnoreActors;	

	// 射线检测

bool bIsHit = UKismetSystemLibrary::LineTraceSingle(GetWorld(), BeginLoc, EndLoc, TraceTypeQuery1, false, IgnoreActors, EDrawDebugTrace::ForDuration, HitResult, true);

if (bIsHit)

{

	UKismetSystemLibrary::PrintString(GetWorld(), HitResult.GetActor()->GetName());

}

LineTraceSingleForObjects

根据 Object Type 检测单个物体

Syntax

static bool LineTraceSingleForObjects(

	const UObject* WorldContextObject,

	const FVector Start,

	const FVector End,

	const TArray<TEnumAsByte<EObjectTypeQuery> > & ObjectTypes,

	bool bTraceComplex,

	const TArray<AActor*>& ActorsToIgnore,

	EDrawDebugTrace::Type DrawDebugType,

	FHitResult& OutHit,

	bool bIgnoreSelf,

	FLinearColor TraceColor = FLinearColor::Red,

	FLinearColor TraceHitColor = FLinearColor::Green,

	float DrawTime = 5.0f

);

EObjectTypeQuery 对应 ObjectType
- 默认 ObjectTypeQuery1 —— WorldStatic
- 默认 ObjectTypeQuery2 —— WorldDynamic
- 默认 ObjectTypeQuery3 —— Oawn
- 默认 ObjectTypeQuery4 —— PhysicasBody
- 默认 ObjectTypeQuery5 —— Vehicle
- 默认 ObjectTypeQuery6 —— Destructible
- 可以再 ProjectSettings->Engine->Collision->Object Channels 添加自定义

代码实现

// 设置要检测的 Object Type

TArray<TEnumAsByte<EObjectTypeQuery> > ObjectTypes;

ObjectTypes.Add(EObjectTypeQuery::ObjectTypeQuery1);

//开始检测

bool bIsHit = UKismetSystemLibrary::LineTraceSingleForObjects(GetWorld(), BeginLoc, EndLoc, ObjectTypes, false, IgnoreActors, EDrawDebugTrace::ForDuration, HitResult, true);

if (bIsHit)

{

	UKismetSystemLibrary::PrintString(GetWorld(), HitResult.GetActor()->GetName());

}

LineTraceSingleByProfile

根据 Collision Preset 检测单个物体

Syntax

static bool LineTraceSingleByProfile(

	const UObject* WorldContextObject,

	const FVector Start,

	const FVector End,

	FName ProfileName,

	bool bTraceComplex,

	const TArray<AActor*>& ActorsToIgnore,

	EDrawDebugTrace::Type DrawDebugType,

	FHitResult& OutHit,

	bool bIgnoreSelf,

	FLinearColor TraceColor = FLinearColor::Red,

	FLinearColor TraceHitColor = FLinearColor::Green,

	float DrawTime = 5.0f

);

ProfileName 对应 Collision Preset 的名称

代码实现

bool bIsHit = UKismetSystemLibrary::LineTraceSingleByProfile(GetWorld(), BeginLoc, EndLoc,TEXT("BlockAll"), false, IgnoreActors, EDrawDebugTrace::ForDuration, HitResult, true);

if (bIsHit)

{

	UKismetSystemLibrary::PrintString(GetWorld(), HitResult.GetActor()->GetName());

}

LineTraceMulti

根据 Channel 检测多个物体，输出 TArray&

Syntax

static bool LineTraceMulti(

	const UObject* WorldContextObject,

	const FVector Start,

	const FVector End,

	ETraceTypeQuery TraceChannel,

	bool bTraceComplex,

	const TArray<AActor*>& ActorsToIgnore,

	EDrawDebugTrace::Type DrawDebugType,

	TArray<FHitResult>& OutHits,

	bool bIgnoreSelf,

	FLinearColor TraceColor = FLinearColor::Red,

	FLinearColor TraceHitColor = FLinearColor::Green,

	float DrawTime = 5.0f

);

LineTraceMultiForObjects

根据 Object Type 检测多个物体，输出 TArray&

Syntax

static bool LineTraceMultiForObjects(

	const UObject* WorldContextObject,

	const FVector Start,

	const FVector End,

	const TArray<TEnumAsByte<EObjectTypeQuery> > & ObjectTypes,

	bool bTraceComplex,

	const TArray<AActor*>& ActorsToIgnore,

	EDrawDebugTrace::Type DrawDebugType,

	TArray<FHitResult>& OutHits,

	bool bIgnoreSelf, FLinearColor TraceColor = FLinearColor::Red,

	FLinearColor TraceHitColor = FLinearColor::Green,

	float DrawTime = 5.0f

);

LineTraceMultiByProfile

根据 Collision Preset 检测多个物体，输出 TArray&

Syntax

static bool LineTraceMultiByProfile

(

	const UObject* WorldContextObject,

	const FVector Start,

	const FVector End,

	FName ProfileName,

	bool bTraceComplex,

	const TArray<AActor*>& ActorsToIgnore,

	EDrawDebugTrace::Type DrawDebugType,

	TArray<FHitResult>& OutHits,

	bool bIgnoreSelf,

	FLinearColor TraceColor = FLinearColor::Red,

	FLinearColor TraceHitColor = FLinearColor::Green,

	float DrawTime = 5.0f

);

BoxTrace

BoxTraceSingle

static bool BoxTraceSingle

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    const FVector HalfSize,

    const FRotator Orientation,

    ETraceTypeQuery TraceChannel,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

BoxTraceMulti

static bool BoxTraceMulti

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    FVector HalfSize,

    const FRotator Orientation,

    ETraceTypeQuery TraceChannel,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

BoxTraceSingleForObjects

static bool BoxTraceSingleForObjects

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    const FVector HalfSize,

    const FRotator Orientation,

    const TArray < TEnumAsByte < EObjectTypeQuery > > & ObjectTypes,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

BoxTraceMultiForObjects

static bool BoxTraceMultiForObjects

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    const FVector HalfSize,

    const FRotator Orientation,

    const TArray < TEnumAsByte < EObjectTypeQuery > > & ObjectTypes,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

BoxTraceSingleByProfile

static bool BoxTraceSingleByProfile

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    const FVector HalfSize,

    const FRotator Orientation,

    FName ProfileName,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

BoxTraceMultiByProfile

static bool BoxTraceMultiByProfile

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    FVector HalfSize,

    const FRotator Orientation,

    FName ProfileName,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

SphereTrace

SphereTraceSingle

static bool SphereTraceSingle

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    ETraceTypeQuery TraceChannel,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

SphereTraceMulti

static bool SphereTraceMulti

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    ETraceTypeQuery TraceChannel,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

SphereTraceSingleForObjects

static bool SphereTraceSingleForObjects

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    const TArray < TEnumAsByte < EObjectTypeQuery > > & ObjectTypes,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

SphereTraceMultiForObjects

static bool SphereTraceMultiForObjects

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    const TArray < TEnumAsByte < EObjectTypeQuery > > & ObjectTypes,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

SphereTraceSingleByProfile

static bool SphereTraceSingleByProfile

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    FName ProfileName,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

SphereTraceMultiByProfile

static bool SphereTraceMultiByProfile

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    FName ProfileName,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

CapsuleTrace

CapsuleTraceSingle

static bool CapsuleTraceSingle

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    float HalfHeight,

    ETraceTypeQuery TraceChannel,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

CapsuleTraceMulti

static bool CapsuleTraceMulti

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    float HalfHeight,

    ETraceTypeQuery TraceChannel,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

CapsuleTraceSingleForObjects

static bool CapsuleTraceSingleForObjects

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    float HalfHeight,

    const TArray < TEnumAsByte < EObjectTypeQuery > > & ObjectTypes,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

CapsuleTraceMultiForObjects

static bool CapsuleTraceMultiForObjects

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    float HalfHeight,

    const TArray < TEnumAsByte < EObjectTypeQuery > > & ObjectTypes,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

CapsuleTraceSingleByProfile

static bool CapsuleTraceSingleByProfile

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    float HalfHeight,

    FName ProfileName,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    FHitResult & OutHit,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

CapsuleTraceMultiByProfile

static bool CapsuleTraceMultiByProfile

(

    const UObject * WorldContextObject,

    const FVector Start,

    const FVector End,

    float Radius,

    float HalfHeight,

    FName ProfileName,

    bool bTraceComplex,

    const TArray < AActor * > & ActorsToIgnore,

    EDrawDebugTrace::Type DrawDebugType,

    TArray < FHitResult > & OutHits,

    bool bIgnoreSelf,

    FLinearColor TraceColor,

    FLinearColor TraceHitColor,

    float DrawTime

)

参考

UKismetSystemLibrary

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【UE4 C++】 射线检测 LineTrace 及 BoxTrace、SphereTrace、CapsuleTrace API

World.h 库里的 Trace API

LineTraceSingleByChannel

UKismetSystemLibrary 库里的 Trace API

LineTrace

LineTraceSingle

LineTraceSingleForObjects

LineTraceSingleByProfile

LineTraceMulti

LineTraceMultiForObjects

LineTraceMultiByProfile

BoxTrace

SphereTrace

CapsuleTrace

参考

【UE4 C++】 射线检测 LineTrace 及 BoxTrace、SphereTrace、CapsuleTrace API的更多相关文章

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【UE4 C++】射线检测 LineTrace 及 BoxTrace、SphereTrace、CapsuleTrace API

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