UE4 手把手教你做插件（4）做一个可以拖入场景的小方块插件

news/2024/4/24 10:32:42/文章来源:https://blog.csdn.net/asiwxy/article/details/129178541

0，前言

学习一下如何编写一个有actor的插件，能够将它拖入场景里面。

1，创建插件

（1）创建一个空白插件

添加之后vs里面就会多出一个目录：

（2）给插件添加一个actor

创建完actor之后，再给actor创建一个组件

都创建完之后，你vs的目录如下：

2，代码修改

（1）MyCubeActor

添加一个我们新建的组件声明

class UMyCubeComponent* MyCubeComponent;

在构造函数中增加组件的创建

AMyCubeActor::AMyCubeActor()
{// 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;MyCubeComponent = CreateDefaultSubobject<UMyCubeComponent>(TEXT("MyCubeComponent"));RootComponent = (USceneComponent*)MyCubeComponent;
}

（2）MyCubeComponent

在头文件中声明增加：

	virtual void OnRegister() override;UPROPERTY(EditAnywhere, BlueprintReadWrite, BlueprintSetter = SetBallMesh, Category = "Ball")UStaticMesh* BallMesh;UFUNCTION(BlueprintCallable, Category = "Rendering|Components|WaterBall3D")void SetBallMesh(UStaticMesh* Value);UPROPERTY(EditAnywhere, BlueprintReadWrite,  Category = "Ball")UStaticMeshComponent* CubeMeshComponent;

在构造函数中添加获取网格的代码：

	BallMesh = (UStaticMesh*)StaticLoadObject(UStaticMesh::StaticClass(), NULL, TEXT("/Game/StarterContent/Shapes/Shape_Cube.Shape_Cube"), NULL, LOAD_None, NULL);

在onregister函数中添加：

void UMyCubeComponent::OnRegister()
{Super::OnRegister();if (!CubeMeshComponent){FName CubeMeshComponentName = MakeUniqueObjectName(this, UMyCubeComponent::StaticClass(), TEXT("CubeMesh"));CubeMeshComponent = NewObject<UStaticMeshComponent>(this, CubeMeshComponentName, RF_Transactional);CubeMeshComponent->RegisterComponent();//GetOwner()->AddInstanceComponent(WaterComponent);CubeMeshComponent->AttachToComponent(this, FAttachmentTransformRules::KeepRelativeTransform);CubeMeshComponent->SetStaticMesh(BallMesh);CubeMeshComponent->SetRelativeLocation(FVector::ZeroVector);CubeMeshComponent->SetRelativeRotation(FRotator::ZeroRotator);CubeMeshComponent->SetRelativeScale3D(FVector(50 / 50.f));}	
}

注意：这部分不能加到构造函数中，不然网格绑定不了actor和component，会导致把方块儿拖到场景中时，actor，component与网格的坐标中心不一致。