【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

最简单的 UE 4 C++ 教程 —— C++ 中添加静态网格文件【三】_unreal 将新建的 actor 子类拖入场景中