Unreal 摄像机切换

1. 准备两个摄像机

//外部摄像机
UPROPERTY(VisibleAnywhere, Category = "CameraComponent")
UCameraComponent* ExternalCamera;
//内部摄像机
UPROPERTY(VisibleAnywhere, Category = "CameraComponent")
UCameraComponent* InternalCamera;
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ExternalCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("ExternalCamera"));
ExternalCamera->SetupAttachment(GetMesh());
InternalCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("InternalCamera"));
InternalCamera->SetupAttachment(GetMesh());

2. 实现切换

在转换时，通常会用到 USceneComponent组件

//USceneComponent组件的位置
FVector InternalCameraOrign;
UPROPERTY(VisibleAnywhere, Category = "CameraComponent")
USceneComponent* InternalCameraBase;
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InternalCameraOrign = FVector(-16.0f, -23.0f, 23.0f);
InternalCameraBase = CreateDefaultSubobject<USceneComponent>(TEXT("InternalCameraBase"));
InternalCameraBase->SetupAttachment(GetMesh());
InternalCameraBase->SetRelativeLocation(InternalCameraOrign);
InternalCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("InternalCamera"));
InternalCamera->SetupAttachment(InternalCameraBase);

3. 设置“切换”绑定

//内部摄像机是否被激活
bool bInCarCameraActive;
//摄像机切换响应函数
void OnToggleCamera();
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void AVehicle::OnToggleCamera()
{
    if (bInCarCameraActive)
    {
        ExternalCamera->Activate();//激活
        InternalCamera->Deactivate();//失活
        bInCarCameraActive = false;
    }
    else
    {
        InternalCamera->Activate();//激活
        ExternalCamera->Deactivate();//失活
        bInCarCameraActive = true;
    }
}

切换绑定

//参数说明：响应名字（与项目设置中自定义的输入名称相同）、什么操作、哪个对象、哪个函数响应
PlayerInputComponent->BindAction("SwitchCamera", IE_Pressed, this, 
&AVehicle::OnToggleCamera);