本系列為個人學(xué)習(xí)筆記，非專業(yè)教程，歡迎交流指正

一、概述

本節(jié)主要介紹浮動平臺的實現(xiàn)（可作為不同關(guān)卡之間的連接）

二、C++實現(xiàn)

1、首先定義靜態(tài)網(wǎng)格體變量

將其初始化并設(shè)為根節(jié)點

此處的靜態(tài)網(wǎng)格體使用的是初學(xué)者內(nèi)容包中的SM_AssetPlatform

2、定義StartPoint和EndPoint，用于確定浮動平臺的起點和終點（均為向量）

MakeEditWidget = “ture”可用來將EndPoint屬性顯示到GamePanel中，實現(xiàn)可視化的調(diào)節(jié)。

同時注意此處的EndPoint坐標(biāo)是相對于浮動平臺的，而非世界坐標(biāo)，因此在計算時需要將EndPoint轉(zhuǎn)換為世界坐標(biāo)。

3、定義bInterping布爾型變量，來控制平臺循環(huán)移動

4、利用插值實現(xiàn)平滑的移動

5、使用TimerManager進(jìn)行定時（平臺停留一段時間后再進(jìn)行移動，方便人物跳躍）

6、.h和.cpp源碼如下

h文件如下

#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "FloatingPlatform.generated.h"UCLASS()
class FIRSTPROJECT_API AFloatingPlatform : public AActor
{GENERATED_BODY()public:	// Sets default values for this actor's propertiesAFloatingPlatform();// Mesh for the platformUPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Platform")UStaticMeshComponent* Mesh;UPROPERTY(EditAnywhere)FVector StartPoint;//將EndPoint顯示在編輯窗口UPROPERTY(EditAnywhere, meta = (MakeEditWidget = "true"))FVector EndPoint;UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Platform")float InterpSpeed;UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Platform")float InterpTime;// 用來控制浮動平臺的往返UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Platform")FTimerHandle InterpTimer;// 判斷是否在插值bool bInterping;float Distance;protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:	// Called every framevirtual void Tick(float DeltaTime) override;void ToggleInterping();void SwapVectors(FVector& VecOne, FVector& VecTwo);};

cpp文件如下

#include "FloatingPlatform.h"
#include "TimerManager.h"// Sets default values
AFloatingPlatform::AFloatingPlatform()
{// 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;Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));RootComponent = Mesh;StartPoint = FVector(0.f);EndPoint = FVector(0.f);bInterping = false;InterpSpeed = 4.f;InterpTime = 1.f;
}// Called when the game starts or when spawned
void AFloatingPlatform::BeginPlay()
{Super::BeginPlay();//將平臺起始位置賦給StartPointStartPoint = GetActorLocation();EndPoint += StartPoint;bInterping = false;GetWorldTimerManager().SetTimer(InterpTimer, this, &AFloatingPlatform::ToggleInterping, InterpTime);Distance = (EndPoint - StartPoint).Size();
}// Called every frame
void AFloatingPlatform::Tick(float DeltaTime)
{Super::Tick(DeltaTime);if(bInterping){FVector CurrentLocation = GetActorLocation();// 插值FVector Interp = FMath::VInterpTo(CurrentLocation, EndPoint, DeltaTime, InterpSpeed);SetActorLocation(Interp);float DistanceTraveled = (GetActorLocation() - StartPoint).Size();if(Distance - DistanceTraveled <= 1.f){ToggleInterping();GetWorldTimerManager().SetTimer(InterpTimer, this, &AFloatingPlatform::ToggleInterping, InterpTime);// 交換起點和終點，使其返回SwapVectors(StartPoint, EndPoint);}}}void AFloatingPlatform::ToggleInterping()
{bInterping = !bInterping;
}void AFloatingPlatform::SwapVectors(FVector& VecOne, FVector& VecTwo)
{FVector Temp = VecOne;VecOne = VecTwo;VecTwo = Temp;
}

三、藍(lán)圖實現(xiàn)（配置碰撞）

升降臺的碰撞類型選擇10DOP-Z Simplified Collision（Z軸對齊，相較于X和Y軸對齊更逼近升降臺的外形）

碰撞盒子如下

總結(jié)

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