如何将fvector添加到tarray＆lt; fvector＆gt;？

Question

我正在尝试为我的枪创建一个 TArray 后坐模式，其中每颗子弹有 30 个不同的 FVector 坐标。我浏览了教程视频并阅读了 https:// docs.unrealengine.com/5.0/en-US/array-containers-in-unreal-engine/ 本指南用于添加到数组。我尝试使用 Add、Emplace、Init 无济于事。我什至使用 SetNum 将大小设置为 30，仍然不起作用，我不明白向 TArray 添加元素的问题是什么。我不断收到此崩溃错误：我不断收到此崩溃错误

这是我的 GunProperties.H

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/BoxComponent.h"
#include "Camera/CameraComponent.h"
#include "GunProperties.generated.h"


#define TRACE_WEAPON  ECC_GameTraceChannel1
UENUM(BlueprintType)
namespace EWeaponProjectile
{
    enum ProjectileType
    {
        EBullet     UMETA(DisplayName = "Bullet"),
        ESpread     UMETA(DisplayName = "Spread"),
        EProjectile UMETA(DisplayName = "Projectile"),
    };
}



USTRUCT()
struct FWeaponData
{
    GENERATED_USTRUCT_BODY()

    
    UPROPERTY(EditDefaultsOnly, Category = Ammo)
        int32 MaxAmmo;
    UPROPERTY(EditDefaultsOnly, Category = Config)
        float TimeBetweenShots;
    UPROPERTY(EditDefaultsOnly, Category = Ammo)
        int32 ShotCost;
    UPROPERTY(EditDefaultsOnly, Category = Config)
        float WeaponRange;
    UPROPERTY(EditDefaultsOnly, Category = Config)
        float WeaponSpread;
    UPROPERTY(EditDefaultsOnly, Category = Config)
        float recoilResetTimeSeconds;
    UPROPERTY(EditDefaultsOnly, Category = Config)
        float lastTimeShotForAr;

};
UCLASS()
class PLAYERVSAI_API AGunProperties : public AActor
{
    GENERATED_BODY()



    
public: 
    
    // Called when the game starts or when spawned
    AGunProperties();
    // Called every frame
    UFUNCTION()
    void Fire(const FVector CameraDir);
    
    UFUNCTION()
    void InstantFire(const FVector CameraDir);

    virtual void BeginPlay() override;

    UPROPERTY(EditDefaultsOnly, Category = Config)
    FWeaponData WeaponConfig;

    UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = Config)
    TEnumAsByte<EWeaponProjectile::ProjectileType> ProjectileType;

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Collision)
        UBoxComponent* CollisionComp;

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Config)
        USkeletalMeshComponent* WeaponMesh;

    /*void InterpAiming(float DeltaSeconds);
    void InterpRelativeHand(float DeltaSeconds);*/
    
    FTransform RecoilTransform;

    FTransform FinalRecoilTransform;
    
    
    //Handle Vector Recoil , returns New Location
    protected:

        FHitResult WeaponTrace(const FVector &TraceFrom, const FVector &TraceTo) const;

        void HandleARShooting(UCameraComponent* Camera);

        void ProcessInstantHit(const FHitResult& Impact, const FVector& Origin, const FVector& ShootDir, int32 RandomSeed, float RadicalSpread);

        void ProcessInstantHitForAR(const FHitResult& Impact, const FVector& Origin);
        
        TArray<FVector> RecoilPattern[];
        
    
};

这是我的 GunProperties.cpp

#include "GunProperties.h"

#include "Engine.h"

AGunProperties::AGunProperties() 
{
    PrimaryActorTick.bCanEverTick = false;
    CollisionComp = CreateDefaultSubobject<UBoxComponent>(TEXT("CollisionComp"));
    RootComponent = CollisionComp;

    WeaponMesh = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("Gun Mesh"));
    WeaponMesh->AttachTo(RootComponent);
    
    
    
}

void AGunProperties::BeginPlay()
{
    Super::BeginPlay();
    if (ProjectileType == EWeaponProjectile::EBullet)
    {
        RecoilPattern->SetNum(30);

        RecoilPattern->Emplace(FVector(-0.2, 0, 0));
        RecoilPattern->Emplace(FVector(-0.2, 0, 0));
        RecoilPattern->Emplace(FVector(-0.2, 0, 0));
        RecoilPattern->Emplace(FVector(-0.2, 0, 0));
        RecoilPattern->Emplace(FVector(-0.2, 0, 0));
        RecoilPattern->Emplace(FVector(-0.2, 0, 0));

        RecoilPattern->Emplace(FVector(-0.3, 0, 0));
        RecoilPattern->Emplace(FVector(-0.3, 0, 0));
        RecoilPattern->Emplace(FVector(-0.3, 0, 0));
        RecoilPattern->Emplace(FVector(-0.3, 0, 0));
        RecoilPattern->Emplace(FVector(-0.3, 0, 0));
        RecoilPattern->Emplace(FVector(-0.3, 0, 0));

        RecoilPattern->Emplace(FVector(-0.5, 0, 0));
        RecoilPattern->Emplace(FVector(-0.5, 0, 0));
        RecoilPattern->Emplace(FVector(-0.5, 0, 0));
        RecoilPattern->Emplace(FVector(-0.5, 0, 0));
        RecoilPattern->Emplace(FVector(-0.5, 0, 0));
        RecoilPattern->Emplace(FVector(-0.5, 0, 0));

        RecoilPattern->Emplace(FVector(0, -0.3, 0));
        RecoilPattern->Emplace(FVector(0, -0.3, 0));
        RecoilPattern->Emplace(FVector(0, -0.3, 0));
        RecoilPattern->Emplace(FVector(0, -0.3, 0));
        RecoilPattern->Emplace(FVector(0, -0.3, 0));
        RecoilPattern->Emplace(FVector(0, -0.3, 0));

        RecoilPattern->Emplace(FVector(0, 0.3, 0));
        RecoilPattern->Emplace(FVector(0, 0.3, 0));
        RecoilPattern->Emplace(FVector(0, 0.3, 0));
        RecoilPattern->Emplace(FVector(0, 0.3, 0));
        RecoilPattern->Emplace(FVector(0, 0.3, 0));
        RecoilPattern->Emplace(FVector(0, 0.3, 0));
    }
}
void AGunProperties::Fire( FVector CameraDir)
{
    if (ProjectileType == EWeaponProjectile::EBullet)
    {
        GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Black, TEXT("Bullet"));
        
        

        
        //InstantFire(CameraDir);
    }
    if (ProjectileType == EWeaponProjectile::ESpread)
    {
        GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Black, TEXT("Spread"));
        for (int32 i = 0; i <= WeaponConfig.WeaponSpread; i++)
        {
            InstantFire(CameraDir);
        }
    }
    if (ProjectileType == EWeaponProjectile::EProjectile)
    {
        GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Black, TEXT("Projectile"));
    }
}

 void AGunProperties::InstantFire( FVector CameraDir)
{
    const int32 RandomSeed = FMath::Rand();
    FRandomStream WeaponRandomStream(RandomSeed);
    const float CurrentSpread = WeaponConfig.WeaponSpread;
    const float SpreadCone = FMath::DegreesToRadians(WeaponConfig.WeaponSpread );
    const FVector StartTrace = WeaponMesh->GetSocketLocation("MF");
    const FVector ShootDir = WeaponRandomStream.VRandCone(StartTrace, SpreadCone, SpreadCone);
    const FVector EndTrace = StartTrace + ShootDir * WeaponConfig.WeaponRange;
    const FHitResult Impact = WeaponTrace(StartTrace, EndTrace);

    ProcessInstantHit(Impact, StartTrace, ShootDir, RandomSeed, CurrentSpread);
}



FHitResult AGunProperties::WeaponTrace(const FVector& TraceFrom, const FVector& TraceTo) const
{
    static FName WeaponFireTag = FName(TEXT("WeaponTrace"));
    FCollisionQueryParams TraceParams(WeaponFireTag, true);
    TraceParams.bReturnPhysicalMaterial = true;
    TraceParams.AddIgnoredActor(this);

    FHitResult Hit(ForceInit);
    GetWorld()->LineTraceSingleByChannel(Hit, TraceFrom, TraceTo, TRACE_WEAPON, TraceParams);
    return Hit;
}

void AGunProperties::HandleARShooting(UCameraComponent* Camera)
{
    if (GetWorld()->DeltaTimeSeconds - WeaponConfig.lastTimeShotForAr / WeaponConfig.TimeBetweenShots)
    {
        //We shoot
        const FVector StartTrace = WeaponMesh->GetSocketLocation("MF");
        const FVector ShootDir = FVector(StartTrace);
        const FVector EndTrace = StartTrace * WeaponConfig.WeaponRange;
        const FHitResult Impact = WeaponTrace(StartTrace, EndTrace);
        ProcessInstantHitForAR(Impact, StartTrace);
        WeaponConfig.lastTimeShotForAr = GetWorld()->DeltaTimeSeconds;
    }
}



void AGunProperties::ProcessInstantHit(const FHitResult& Impact, const FVector& Origin, const FVector& ShootDir, int32 RandomSeed, float RadicalSpread)
{
    const FVector EndTrace = Origin + ShootDir * WeaponConfig.WeaponRange;
    const FVector EndPoint = Impact.GetActor() ? Impact.ImpactPoint : EndTrace;
    DrawDebugLine(this->GetWorld(), Origin, Impact.TraceEnd, FColor::Black,false, 1000, 10.f);
}

void AGunProperties::ProcessInstantHitForAR(const FHitResult& Impact, const FVector& Origin)
{
    const FVector EndTrace = Origin* WeaponConfig.WeaponRange;
    const FVector EndPoint = Impact.GetActor() ? Impact.ImpactPoint : EndTrace;
    DrawDebugLine(this->GetWorld(), Origin, Impact.TraceEnd, FColor::Black, false, 1000, 10.f);
}

Answer 1

问题是我没有在 TArray 上方添加 UPROPERTY() 。 Epic 在我链接的指南中没有提到这一点，或者我可能在某个地方错过了它。将学分归功于这篇文章中提到它的人。 https: //forums.unrealengine.com/t/why-does-the-engine-crash-when-adding-to-an-array/82703/8