複数の固定カメラの視点を切り替える

1. コンテンツ ブラウザで C++ クラス フォルダへナビゲートし、 BlendTriggerVolume.h クラス デフォルトを開きます。

2. クラス デフォルトで、既存の TSubClassOfAActor 宣言を削除し以下で置き換えます。

   protected:
   
   UPROPERTY(EditAnywhere, BlueprintReadWrite)
   ACameraActor* CameraToFind;

3. 次に「 BlendTriggerVolume.cpp 」ファイルへナビゲートし、コンストラクタ ABlendTriggerVolume::ABlendTriggerVolume で以下を宣言します。

   // Sets default values
   ABlendTriggerVolume::ABlendTriggerVolume()
   {
        // Set this actor to call Tick() every frame.You can turn this off to improve performance if you don't need it.
       PrimaryActorTick.bCanEverTick = true;
   
       OverlapVolume = CreateDefaultSubobject<UBoxComponent>(TEXT("CameraProximityVolume"));
       OverlapVolume->SetupAttachment(RootComponent);
   
       CameraToFind = CreateDefaultSubobject<ACameraActor>(TEXT("CameraToFind"));
   }

4. ABlendTriggerVolume::NotifyActorBeginOverlap メソッドで、コードの次の行を削除します。

   //Array to contain found Camera Actors
   TArray<AActor*> FoundActors;
   
    //Utility function to populate array with all Camera Actors in the level 
   UGameplayStatics::GetAllActorsOfClass(GetWorld(), CameraToFind, FoundActors);
   
   //Sets Player Controller view to the first CameraActor found 
   
   PlayerCharacterController->SetViewTargetWithBlend(FoundActors[0], CameraBlendTime, EViewTargetBlendFunction::VTBlend_Linear);

   削除したコードを以下で置き換えます。

   //Sets Player Controller view to the CameraActorToFind variable.
               PlayerCharacterController->SetViewTargetWithBlend(CameraToFind, CameraBlendTime, EViewTargetBlendFunction::VTBlend_Linear);
           }
       }
   }

   上記の宣言では、プレイヤー キャラクターがボリュームと重なると、クラスのコンストラクタでインスタンス化された カメラアクタ 変数にトランジションするようにロジックを置き換えました。

完成コード

BlendTriggerVolume.h

//Copyright 1998-2021 Epic Games, Inc.無断複写・転載を禁じます。

pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "BlendTriggerVolume.generated.h"

UCLASS()
class STATICCAMERAS_API ABlendTriggerVolume : public AActor
{
    GENERATED_BODY()

public:    
    // Sets default values for this actor's properties
    ABlendTriggerVolume();

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

    UPROPERTY(EditAnywhere, BlueprintReadWrite)
    class UBoxComponent* OverlapVolume;

    UPROPERTY(EditAnywhere, BlueprintReadWrite)
    ACameraActor* CameraToFind;

    UPROPERTY(EditDefaultsOnly, meta =(ClampMin = 0.0f))
    float CameraBlendTime;

    virtual void NotifyActorBeginOverlap(AActor* OtherActor);

    virtual void NotifyActorEndOverlap(AActor* OtherActor);

public:    
    // Called every frame
    virtual void Tick(float DeltaTime) override;

};

BlendTriggerVolume.cpp

//Copyright 1998-2021 Epic Games, Inc.無断複写・転載を禁じます。

#include "BlendTriggerVolume.h"
#include "Components/BoxComponent.h"
#include "StaticCamerasCharacter.h"
#include "Camera/CameraActor.h"
#include "Runtime/Engine/Classes/Kismet/GameplayStatics.h"

// Sets default values
ABlendTriggerVolume::ABlendTriggerVolume()
{
     // Set this actor to call Tick() every frame.You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;

    OverlapVolume = CreateDefaultSubobject<UBoxComponent>(TEXT("CameraProximityVolume"));
    OverlapVolume->SetupAttachment(RootComponent);

    CameraToFind = CreateDefaultSubobject<ACameraActor>(TEXT("CameraToFind"));
}

// Called when the game starts or when spawned
void ABlendTriggerVolume::BeginPlay()
{
    Super::BeginPlay();
}

void ABlendTriggerVolume::NotifyActorBeginOverlap(AActor* OtherActor)
{
    if (AStaticCamerasCharacter* PlayerCharacterCheck = Cast<AStaticCamerasCharacter>(OtherActor))
    {
        if (APlayerController* PlayerCharacterController = Cast<APlayerController>(PlayerCharacterCheck->GetController()))
        {
            PlayerCharacterController->SetViewTargetWithBlend(CameraToFind, CameraBlendTime, EViewTargetBlendFunction::VTBlend_Linear);
        }
    }
}

void ABlendTriggerVolume::NotifyActorEndOverlap(AActor* OtherActor)
{
    if (AStaticCamerasCharacter* PlayerCharacterCheck = Cast<AStaticCamerasCharacter>(OtherActor))
    {
        if (APlayerController* PlayerCharacterController = Cast<APlayerController>(PlayerCharacterCheck->GetController()))
        {
            PlayerCharacterController->SetViewTargetWithBlend(PlayerCharacterController->GetPawn(), CameraBlendTime, EViewTargetBlendFunction::VTBlend_Linear);
        }
    }
}

// Called every frame
void ABlendTriggerVolume::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

}