【UE4】两个摄像头之间切换

【UE4】两个摄像头之间切换

一、效果展示

二、操作步骤

• 创建两个摄像机，一个放在场景中，另一个放在Cube上

• 摄像机的细节面板中约束宽高比（Constrain Aspect Ratio）属性勾选后可以让两个摄像头之间的切换更流畅，但这不是必须的

• 会用到#include "Kismet/GameplayStatics.h"头文件，获取玩家控制器的方法在这个类中

三、已知摄像机数量写法

h

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include &#ated.h"UCLASS()
class QUICKSTART_API ACameraDirector : public AActor
{GENERATED_BODY()public:	// Sets default values for this actor's propertiesACameraDirector();//在编辑器中可以编辑UPROPERTY(EditAnywhere)AActor* CameraOne;UPROPERTY(EditAnywhere)AActor* CameraTwo;float TimeToNextCameraChange;
protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:	// Called every framevirtual void Tick(float DeltaTime) override;};

cpp

// Fill out your copyright notice in the Description page of Project Settings.#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);//摄像机切换间隔时间/摄像机停留时间const float TimeBetweenCameraChanges = 2.0f;//光滑的混合时间const float SmoothBlendTime = 0.75f;TimeToNextCameraChange -= DeltaTime;if (TimeToNextCameraChange <= 0.0f){//重置TimeToNextCameraChange += TimeBetweenCameraChanges;//查找本地玩家控制的actor APlayerController* OurPlayerController = UGameplayStatics::GetPlayerController(this, 0);if (OurPlayerController){if (OurPlayerController->GetViewTarget() != CameraOne && CameraOne != nullptr){//立刻切换到摄像机1OurPlayerController->SetViewTarget(CameraOne);}else if (OurPlayerController->GetViewTarget() != CameraTwo && CameraTwo != nullptr){//平滑的切换到摄像机2OurPlayerController->SetViewTargetWithBlend(CameraTwo,SmoothBlendTime);}}}
}

四、动态增加摄像机数量

使用数组TArray
h

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include &#ated.h"UCLASS()
class QUICKSTART_API ACameraDirector : public AActor
{GENERATED_BODY()public:	// Sets default values for this actor's propertiesACameraDirector();UPROPERTY(EditAnywhere)TArray<AActor*> CameraArr;float TimeToNextCameraChange;
private:
protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:	// Called every framevirtual void Tick(float DeltaTime) override;};

cpp

// Fill out your copyright notice in the Description page of Project Settings.#include "CameraDirector.h"
#include "Kismet/GameplayStatics.h"static int iCurrentNum = 0;
// 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);//摄像机切换间隔时间/摄像机停留时间const float TimeBetweenCameraChanges = 2.0f;//光滑的混合时间const float SmoothBlendTime = 0.75f;TimeToNextCameraChange -= DeltaTime;if (TimeToNextCameraChange <= 0.0f){//重置TimeToNextCameraChange += TimeBetweenCameraChanges;//查找本地玩家控制的actor APlayerController* OurPlayerController = UGameplayStatics::GetPlayerController(this, 0);if (OurPlayerController){int32 iCameraCount = CameraArr.Num();if (iCurrentCameraNum < iCameraCount){if (CameraArr[iCurrentCameraNum] != nullptr){//平滑地混合到摄像机OurPlayerController->SetViewTargetWithBlend(CameraArr[iCurrentCameraNum], SmoothBlendTime);}iCurrentCameraNum++;}else{iCurrentCameraNum = 0;//立即切换到摄像机1OurPlayerController->SetViewTarget(CameraArr[iCurrentCameraNum]);}}}
}

再回到细节面板就可以发现多了个小加号，点击加号可以自由增加数组的大小