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【UE4 C++】 射线检测 LineTrace 及 BoxTrace、SphereTrace、CapsuleTrace API
阅读原文时间：2023年07月11日阅读：1

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

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
);

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
);

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
);

  • 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
)

  • 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
)

  • 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
)

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