目錄

• 自主操作題目
• 邏輯
• 代碼

本文嘗試編寫了官方文檔游戲控制的攝像機中的自主操作題目2

自主操作題目

使用一個數組變量來存儲攝像機，而不是攝像機1（CameraOne）和攝像機2（CameraTwo），這樣你就可以遍歷任意數量攝像機的序列，而不是僅僅兩個。

邏輯

頭文件創建一個EditAnywhere的Camera數組（TArray<AActor*>）（設置成UPROPERTY以便于在虛幻編輯器中綁定具體的攝像機）

頭文件設置平滑轉換兩個攝像機的時間間隔SmoothBlendTime（這里將其設置成了UPROPERTY以便于在虛幻編輯器中修改）

cpp的tick函數中設置在每個攝像機停留的時間TimeBetweenCameraChange

TimeToNextCameraChange減去Deltatime后判斷其是否小于零，是則觸發攝像機轉換

• 在攝像機轉換中：
  • 重設 TimeToNextCameraChange
  • 獲取本地玩家控制的Actor（UGameplayStatics::GetPlayerController）
  • 編寫攝像機之間的轉換
    • 確認當前正在使用的攝像機并查看下一個攝像機是否存在
    • 存在則進行攝像機的轉換（OurPlayerController->SetViewTargetWithBlend函數）

代碼

// 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;//查找處理本地玩家控制的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;}}}}}}

總結

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