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3. 在世界中放置相机Director(导演)

  1. 在代码编译完成后,我们可以把 内容浏览器 中的新类的实例拖曳到 关卡编辑器 中。

    CameraDirectorInContentBrowser.png

  2. 接下来,我们需要设置CameraOne(相机1)和CameraTwo(相机2)变量。 在 World Outliner (世界大纲视图)中搜寻CameraDirector,并在 详细信息面板 中进行编辑。

    CameraDirectorDetails.png

    点击标记为"无"的下拉框,然后设置变量为 Cube (立方体)和我们之前创建的 CameraActor (相机Actor)。

    CameraDirectorDetails2.png

  3. 如果我们按下 Play (播放),我们将会看到与此视图对齐的相机:

    CameraOneView.png

    然后平滑混合到此视图:

    CameraTwoView.png

    在对齐之前,它会等待几秒。


我们现在的这个系统会完全基于游戏逻辑来移动玩家的相机。 代码可进行修改以在任何游戏中进行使用,玩家在这些游戏中无法直接控制相机,或者在这些游戏中,在相机视图间的混合是有效的。

完成的代码

MyPawn.h

// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.

#pragma once

#include "GameFramework/Actor.h"
#include "CameraDirector.generated.h"

UCLASS()
class HOWTO_AUTOCAMERA_API ACameraDirector : public AActor
{
    GENERATED_BODY()

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

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

    // Called every frame
    virtual void Tick( float DeltaSeconds ) override;

    UPROPERTY(EditAnywhere)
    AActor* CameraOne;

    UPROPERTY(EditAnywhere)
    AActor* CameraTwo;

    float TimeToNextCameraChange;
};

MyPawn.cpp

// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.

#include "HowTo_AutoCamera.h"
#include "CameraDirector.h"
#include "Kismet/GameplayStatics.h"

// Sets default values
ACameraDirector::ACameraDirector()
{
    // 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;

}

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

}

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

    const float TimeBetweenCameraChanges = 2.0f;
    const float SmoothBlendTime = 0.75f;
    TimeToNextCameraChange -= DeltaTime;
    if (TimeToNextCameraChange <= 0.0f)
    {
        TimeToNextCameraChange += TimeBetweenCameraChanges;

        //Find the actor that handles control for the local player.
        APlayerController* OurPlayerController = UGameplayStatics::GetPlayerController(this, 0);
        if (OurPlayerController)
        {
            if (CameraTwo && (OurPlayerController->GetViewTarget() == CameraOne))
            {
                //Blend smoothly to camera two.
                OurPlayerController->SetViewTargetWithBlend(CameraTwo, SmoothBlendTime);
            }
            else if (CameraOne)
            {
                //Cut instantly to camera one.
                OurPlayerController->SetViewTarget(CameraOne);
            }
        }
    }
}