UE4第一人称游戏 ——（6）仿MC方块

╰半橙微兮° 2022-10-07 15:50 166阅读 0赞

# 1. 序 #

参考：[https://www.bilibili.com/video/BV1ME411n7TB?share\_source=copy\_web][https_www.bilibili.com_video_BV1ME411n7TB_share_source_copy_web]

找了各种教程其实都是为了这一步，仿MC，但是都没做成，这次稍微离得近了点吧。

# 2. 代码 #

新建Actor C++类，上面b站连接进去看视屏，老六讲的不错。

这里主要是为了记个笔记，不做过多分析说明。

代码如下

.h文件

// Fill out your copyright notice in the Description page of Project Settings.
    
    #pragma once
    
    #include "CoreMinimal.h"
    #include "GameFramework/Actor.h"
    #include "ProceduralMeshComponent.h"
    #include "CubeActor.generated.h"
    
    
    UENUM(BlueprintType)
    enum class EFaceType : uint8
    {
    	Up,
    	Down,
    	Right,
    	Left,
    	Forward,
    	Back
    };
    
    
    UCLASS()
    class NEWWORLD_API ACubeActor : public AActor
    {
    	GENERATED_BODY()
    	
    public:	
    	// Sets default values for this actor's properties
    	ACubeActor();
    
    	UPROPERTY(BlueprintReadWrite, EditAnywhere)
    		UMaterialInterface* material;
    
    	UPROPERTY(BlueprintReadOnly)
    		UProceduralMeshComponent* produralMesh;
    
    	TArray<FVector> Vertices;
    	TArray<int32> Triangles;
    	TArray<FVector> Normals;
    	TArray<FVector2D> UV0;
    	TArray<FLinearColor> VertexColors;
    	TArray<FProcMeshTangent> Tangents;
    	
    
    protected:
    	// Called when the game starts or when spawned
    	virtual void BeginPlay() override;
    
    	virtual void OnConstruction(const FTransform& transform) override;
    
    public:	
    	// Called every frame
    	virtual void Tick(float DeltaTime) override;
    
    	void BuildCube();
    
    	void BuildFace(EFaceType facetype,FVector center,FVector up,FVector right,bool reversed);
    
    	
    };

.cpp文件

// Fill out your copyright notice in the Description page of Project Settings.
    
    
    #include "CubeActor.h"
    
    
    // Sets default values
    ACubeActor::ACubeActor()
    {
     	// 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 ACubeActor::BeginPlay()
    {
    	Super::BeginPlay();
    	
    }
    
    void ACubeActor::OnConstruction(const FTransform& transform)
    {
    	produralMesh = NewObject<UProceduralMeshComponent>(this, "produralMesh");
    	produralMesh->RegisterComponent();
    
    	RootComponent = produralMesh;
    	produralMesh->SetWorldTransform(transform);
    
    	BuildCube();
    }
    
    // Called every frame
    void ACubeActor::Tick(float DeltaTime)
    {
    	Super::Tick(DeltaTime);
    
    }
    
    void ACubeActor::BuildCube()
    {
    	BuildFace(EFaceType::Up, FVector(0, 0, 100), FVector::ForwardVector, FVector::RightVector, false);
    	BuildFace(EFaceType::Down, FVector(0, 0, 0), FVector::ForwardVector, FVector::RightVector, true);
    	BuildFace(EFaceType::Forward, FVector(100, 0, 0), FVector::UpVector, FVector::RightVector, true);
    	BuildFace(EFaceType::Back, FVector(0, 0, 0), FVector::UpVector, FVector::RightVector, false);
    	BuildFace(EFaceType::Right, FVector(0, 100, 0), FVector::ForwardVector, FVector::UpVector, true);
    	BuildFace(EFaceType::Left, FVector(0, 0, 0), FVector::ForwardVector, FVector::UpVector, false);
    	produralMesh->ClearAllMeshSections();
    	produralMesh->CreateMeshSection_LinearColor(0,Vertices,Triangles, Normals,UV0,VertexColors,Tangents,true);
    	produralMesh->SetMaterial(0, material);
    }
    
    void ACubeActor::BuildFace(EFaceType facetype, FVector center, FVector up, FVector right, bool reversed)
    {
    	int index = Vertices.Num();
    
    	Vertices.Add(center);
    	Vertices.Add(center + up * 100);
    	Vertices.Add(center + up * 100 + right * 100);
    	Vertices.Add(center + right * 100);
    	if (reversed)
    	{
    		Triangles.Add(index + 0);
    		Triangles.Add(index + 1);
    		Triangles.Add(index + 2);
    		Triangles.Add(index + 2);
    		Triangles.Add(index + 3);
    		Triangles.Add(index + 0);
    	}
    	else
    	{
    		Triangles.Add(index + 1);
    		Triangles.Add(index + 0);
    		Triangles.Add(index + 2);
    		Triangles.Add(index + 3);
    		Triangles.Add(index + 2);
    		Triangles.Add(index + 0);
    	}
    	
    
    	const FVector2D bUVs[] = { FVector2D(0.0,0.0),FVector2D(0.0,1.0), FVector2D(1.0,1.0), FVector2D(1.0,0.0) };
    	UV0.Append(bUVs,ARRAY_COUNT(bUVs));
    }

[https_www.bilibili.com_video_BV1ME411n7TB_share_source_copy_web]: https://www.bilibili.com/video/BV1ME411n7TB?share_source=copy_web