Unreal Engine 4切换默认Camera实现

蔚落 2022-07-15 11:21 201阅读 0赞

http://blog.csdn.net/shangguanwaner/article/details/39399439

默认的，UE4,会以AGameMode中设置DefaultPawnClass对象中摄影机作为默认摄影机。有时候我们想要一个全局的摄影机对场景进行观察，这就需要重新创建一个摄影机，并在这两个摄影机直接切换。下面看下如何实现。

在APlayerController类中，有一个SetViewTarget方法，参数是一个AActor指针，就是实现此功能的。因为参数必须是AActor，即必须是AActor中包含的Camera组件才有效，所有，先创建一个AActor对象。

FreeCameraActor.h

UCLASS()  
class NANTOPDOWN\_API AFreeCameraActor : public AActor  
\{  
GENERATED\_UCLASS\_BODY()  
  
  
public:  
UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera)  
TSubobjectPtr<class UCameraComponent> TopDownCameraComponent;  
  
  
UFUNCTION(BlueprintCallable, Category = "View Target")  
void ChangeViewTarget();  
  
  
virtual void BeginPlay() override;  
  
private:  
AActor\* OldActor;  
\};

ChangeViewTarget()方法提供给Blueprint调用，用于在Character的Camera和FreeCamera之间切换。

FreeCameraActor.cpp

AFreeCameraActor::AFreeCameraActor(const class FPostConstructInitializeProperties& PCIP)  
: Super(PCIP)  
\{  
TopDownCameraComponent = PCIP.CreateDefaultSubobject<UCameraComponent>(this, TEXT("TopDownCamera"));  
this->RootComponent = TopDownCameraComponent;  
OldActor = NULL;  
\}  
  
  
void AFreeCameraActor::ChangeViewTarget()  
\{  
AActor\* pActor = this->GetWorld()->GetFirstPlayerController()->GetViewTarget();  
if (pActor != OldActor)  
\{  
this->GetWorld()->GetFirstPlayerController()->SetViewTarget(OldActor);  
\}  
else  
\{  
this->GetWorld()->GetFirstPlayerController()->SetViewTarget(this);  
\}  
\}  
  
  
void AFreeCameraActor::BeginPlay()  
\{  
Super::BeginPlay();  
  
  
OldActor = this->GetWorld()->GetFirstPlayerController()->GetViewTarget();  
  
  
this->GetWorld()->GetFirstPlayerController()->SetViewTarget(this);  
\}

在Editor中创建一个从AFreeCameraActor继承的Actor，并拖放到场景中去。可以看到一个包含了摄影机的对象。然后编辑Level Blueprint，加入脚本代码

![Center][]

Play场景，按下1键，就能看到摄影机在character和刚才新建的摄影机间进行切换了。

[Center]: /images/20220715/063bb17a1f9f496eb49f9560d4312a1d.png