目录

• 自主操作题目
• 逻辑
• 代码

本文尝试编写了官方文档游戏控制的摄像机中的自主操作题目2

自主操作题目

使用一个数组变量来存储摄像机，而不是摄像机1（CameraOne）和摄像机2（CameraTwo），这样你就可以遍历任意数量摄像机的序列，而不是仅仅两个。

逻辑

头文件创建一个EditAnywhere的Camera数组（TArray<AActor*>）（设置成UPROPERTY以便于在虚幻编辑器中绑定具体的摄像机）

头文件设置平滑转换两个摄像机的时间间隔SmoothBlendTime（这里将其设置成了UPROPERTY以便于在虚幻编辑器中修改）

cpp的tick函数中设置在每个摄像机停留的时间TimeBetweenCameraChange

TimeToNextCameraChange减去Deltatime后判断其是否小于零，是则触发摄像机转换

• 在摄像机转换中：
  • 重设 TimeToNextCameraChange
  • 获取本地玩家控制的Actor（UGameplayStatics::GetPlayerController）
  • 编写摄像机之间的转换
    • 确认当前正在使用的摄像机并查看下一个摄像机是否存在
    • 存在则进行摄像机的转换（OurPlayerController->SetViewTargetWithBlend函数）

代码

// Fill out your copyright notice in the Description page of Project Settings. // CameraDirector.h#pragma once#include "CoreMinimal.h" #include "GameFramework/Actor.h" #include "CameraDirector.generated.h"UCLASS() class QUICKSTART_API ACameraDirector : public AActor {GENERATED_BODY()public: // Sets default values for this actor's propertiesACameraDirector();protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public: // Called every framevirtual void Tick(float DeltaTime) override;UPROPERTY(EditAnywhere)TArray<AActor*> CameraArr;float TimeToNextCameraChange;UPROPERTY(EditAnywhere)float SmoothBlendTime = 0.75f;}; // Fill out your copyrightnotice in the Description page of Project Settings. //CameraDirector.cpp#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 TimeBetweenCameraChange = 2.0f;TimeToNextCameraChange -= DeltaTime;if (TimeToNextCameraChange <= 0.0f) {TimeToNextCameraChange += TimeBetweenCameraChange;//查找处理本地玩家控制的Actor。APlayerController* OurPlayerController = UGameplayStatics::GetPlayerController(this, 0);bool bUnchanged = true;if (OurPlayerController) {if (CameraArr[0] && (OurPlayerController->GetViewTarget() == CameraArr[CameraArr.Num() - 1])) {OurPlayerController->SetViewTargetWithBlend(CameraArr[0], SmoothBlendTime);}else {for (int32 Index = 0; bUnchanged && Index != CameraArr.Num() - 1; ++Index) {if (CameraArr[Index + 1] && (OurPlayerController->GetViewTarget() == CameraArr[Index])) {OurPlayerController->SetViewTargetWithBlend(CameraArr[Index + 1], SmoothBlendTime);bUnchanged = false;}}}}}}

总结

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