Pawn 类使用 On Begin Overlap 事件 Unreal Engine C++

Question

我制作了一个简单的 pawn 类，它应该是一个球，可以四处移动并收集硬币。对于硬币收集系统，我制作了重叠事件以在球被击中时通知球。下面是基本代码（APlayerBall 是生成到游戏中的默认 pawn 类）：

PlayerBall.h

UCLASS()
class ROLLINGBALL_API APlayerBall : public APawn
{
    GENERATED_BODY()

public:
    // Sets default values for this pawn's properties
    APlayerBall();

    UPROPERTY(VisibleAnywhere, Category="Mesh")
    UStaticMeshComponent* Mesh;

    UPROPERTY(VisibleAnywhere, Category="Mesh")
    class UCameraComponent* Camera;

    UPROPERTY(VisibleAnywhere, Category="Mesh")
    class UCapsuleComponent* Capsule;

protected:
    // Called when the game starts or when spawned
    void BeginPlay() override;

    UFUNCTION()
    void BeginOverlap(UPrimitiveComponent* OverlappedComponent, 
                      AActor* OtherActor, 
                      UPrimitiveComponent* OtherComp, 
                      int32 OtherBodyIndex, 
                      bool bFromSweep, 
                      const FHitResult &SweepResult );
public: 
    // Called every frame
    void Tick(float DeltaTime) override;

    // Called to bind functionality to input
    void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;
};

PlayerBall.cpp

构造函数：

APlayerBall::APlayerBall() {
    Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
    Mesh->SetStaticMesh(ConstructorHelpers::FObjectFinder<UStaticMesh>(TEXT("StaticMesh'/Game/StarterContent/Shapes/Shape_Sphere.Shape_Sphere'")).Object);
    Mesh->SetSimulatePhysics(true);
    Mesh->SetEnableGravity(true);
    SetRootComponent(Mesh);

    Camera = CreateDefaultSubobject<UCameraComponent>(TEXT("Camera"));
    Camera->SetRelativeLocation(FVector(-500.0f, 0.0f, BaseEyeHeight));
    Camera->SetupAttachment(RootComponent);

    Capsule = CreateDefaultSubobject<UCapsuleComponent>(TEXT("Capsule"));
    Capsule->OnComponentBeginOverlap.AddDynamic(this, &APlayerBall::BeginOverlap);
    Capsule->SetupAttachment(Mesh);

    AutoPossessPlayer = EAutoReceiveInput::Player0;
}

还有BeginOverlap 方法：

void APlayerBall::BeginOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult) {
    UE_LOG(LogTemp, Warning, TEXT("%s"), *OtherActor->GetHumanReadableName());
    UE_LOG(LogTemp, Warning, TEXT("%s"), *GetHumanReadableName());
    UE_LOG(LogTemp, Warning, TEXT("%s"), OtherActor == this ? TEXT("The Colliding Actor Is Myself") : TEXT("The Colliding Actor Is Not Myself"));
}

如您所见，我添加了日志消息以查看究竟是什么击中了它。经过一点调试，我发现它由于某种原因被自己击中了。游戏一开始，登录界面是这样的：为什么会这样？我该如何解决这个问题？

Answer 1

另一种方法是使用IgnoreActorWhenMoving，你可以得到更多细节here~

Answer 2

看起来网格组件与胶囊组件重叠。将组件添加到您的日志以进行确认。

如果您只想知道您的演员何时与另一个演员重叠，您可能想改用AActor::NotifyActorBeginOverlap。

如果您想使用组件重叠，但又想忽略您自己的 Actor 中其他组件的重叠，那么您要么必须在 BeginOverlap 中自己过滤掉它们，要么调整您的物理碰撞配置文件，以便每个组件具有不为彼此生成重叠事件的不同对象类型。如果是我，我会像这样做一个过滤器：

void APlayerBall::BeginOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult) {
    if (this == OtherActor) {
        // The Colliding Actor Is Myself. Ignoring because I don't care about this for some reason.
        UE_LOG(LogTemp, Warning, TEXT("Ignoring component overlap of my own components"));
        return;
    }
    UE_LOG(LogTemp, Warning, TEXT("%s"), *OtherActor->GetHumanReadableName());
    UE_LOG(LogTemp, Warning, TEXT("%s"), *GetHumanReadableName());
}