最简单的 UE 4 C++ 教程 —— C++ 中添加静态网格文件【三】

【原教程是基于 UE 4.18，我是基于 UE 4.25】

英文源地址

接上一节的教程，让我们首先创建一个名为 AddMeshFromFile 的新 Actor 子类。

我们不需要在头文件中做任何事情。

下面是创建新类时生成的默认头文件。

AddMeshFromFile.h

  

   

    

     

    
    

     

      #pragma once
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      #include "CoreMinimal.h"
     
    
   

    

     

    
    

     

      #include "GameFramework/Actor.h"
     
    
   

    

     

    
    

     

      #include "AddMeshFromFile.generated.h"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      UCLASS()
     
    
   

    

     

    
    

     

      class UNREALCPP_API AAddMeshFromFile : public AActor
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	GENERATED_BODY()
     
    
   

    

     

    
    

     
	
     
    
   

    

     

    
    

     

      public:	
     
    
   

    

     

    
    

     
	// Sets default values for this actor's properties
     
    
   

    

     

    
    

     
	AAddMeshFromFile();
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      protected:
     
    
   

    

     

    
    

     
	// Called when the game starts or when spawned
     
    
   

    

     

    
    

     
	virtual void BeginPlay() override;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      public:	
     
    
   

    

     

    
    

     
	// Called every frame
     
    
   

    

     

    
    

     
	virtual void Tick(float DeltaTime) override;
     
    
   

    

     

    
    

     

      };
     
    
  
 

为了以编程方式添加一个特定的网格，我们必须包含 ConstructorHelpers.h 文件【此处修订原英文教程的编译错误】。

代码如下，在 Actor 子类头文件后包含该头文件。

  

   

    

     

    
    

     

      #include "AddMeshFromFile.h"
     
    
   

    

     

    
    

     

      // add constructor header
     
    
   

    

     

    
    

     

      #include "UObject/ConstructorHelpers.h"
     
    
  
 

接下来，在 Actor 子类的构造函数中，我们将设置要添加到 actor 中的网格的默认值。创建一个UStaticMeshComponent 指针，并将其设置为 RootComponent 。

  

   

    

     

    
    

     

      AAddMeshFromFile::AAddMeshFromFile()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
 	// 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;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	// add Cylinder to root
     
    
   

    

     

    
    

     

          UStaticMeshComponent* Cylinder = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("VisualRepresentation"));
     
    
   

    

     

    
    

     

          Cylinder->SetupAttachment(RootComponent);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
  
 

在我们的初始化设置之后，下一步是添加我们想要的网格到我们的角色。我们将使用ConstructorHelpers 中地方法 FObjectFinder 来定位我们的网格。在这个例子中，我构造并调用了变量 CylinderAsset，并传入了由初学者内容提供的圆柱体形状的路径。我们传入的路径是 /Game/StarterContent/Shapes/Shape_Cylinder.Shape_Cylinder 。

  

   

    

     

    
    

     

      AAddMeshFromFile::AAddMeshFromFile()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
 	// 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;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	// add Cylinder to root
     
    
   

    

     

    
    

     

          UStaticMeshComponent* Cylinder = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("VisualRepresentation"));
     
    
   

    

     

    
    

     

          Cylinder->SetupAttachment(RootComponent);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    static ConstructorHelpers::FObjectFinder<UStaticMesh> CylinderAsset(TEXT("/Game/StarterContent/Shapes/Shape_Cylinder.Shape_Cylinder"));
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
  
 

接下来，让我们做一个错误检查，以确保我们成功地获得网格。

if (CylinderAsset.Succeeded()) {}
 

如果该检查语句通过的话，让我们接着在圆柱体组件上执行下面三句话

• SetStaticMesh
• SetRelativeLocation
• SetWorldScale3D

  

   

    

     

    
    

     

      if (CylinderAsset.Succeeded()) 
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

          Cylinder->SetStaticMesh(CylinderAsset.Object);
     
    
   

    

     

    
    

     

          Cylinder->SetRelativeLocation(FVector(0.0f, 0.0f, 0.0f));
     
    
   

    

     

    
    

     

          Cylinder->SetWorldScale3D(FVector(1.f));
     
    
   

    

     

    
    

     

      }
     
    
  
 

最后完整的 cpp 如下所示

  

   

    

     

    
    

     

      #include "AddMeshFromFile.h"
     
    
   

    

     

    
    

     

      // add constructor header
     
    
   

    

     

    
    

     

      #include "UObject/ConstructorHelpers.h"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      // Sets default values
     
    
   

    

     

    
    

     

      AAddMeshFromFile::AAddMeshFromFile()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
 	// 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;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	// add Cylinder to root
     
    
   

    

     

    
    

     

          UStaticMeshComponent* Cylinder = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("VisualRepresentation"));
     
    
   

    

     

    
    

     

          Cylinder->SetupAttachment(RootComponent);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    static ConstructorHelpers::FObjectFinder<UStaticMesh> CylinderAsset(TEXT("/Game/StarterContent/Shapes/Shape_Cylinder.Shape_Cylinder"));
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	if (CylinderAsset.Succeeded())
     
    
   

    

     

    
    

     

          {
     
    
   

    

     

    
    

     

              Cylinder->SetStaticMesh(CylinderAsset.Object);
     
    
   

    

     

    
    

     

              Cylinder->SetRelativeLocation(FVector(0.0f, 0.0f, 0.0f));
     
    
   

    

     

    
    

     

              Cylinder->SetWorldScale3D(FVector(1.f));
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      // Called when the game starts or when spawned
     
    
   

    

     

    
    

     

      void AAddMeshFromFile::BeginPlay()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	Super::BeginPlay();
     
    
   

    

     

    
    

     
	
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      // Called every frame
     
    
   

    

     

    
    

     

      void AAddMeshFromFile::Tick(float DeltaTime)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	Super::Tick(DeltaTime);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
  
 

最后的结果如下

将新建的 actor 子类拖入场景中

文章来源: panda1234lee.blog.csdn.net，作者：panda1234lee，版权归原作者所有，如需转载，请联系作者。

原文链接：panda1234lee.blog.csdn.net/article/details/119094175