C++ - array of mesh components, how to

Development Programming & Scripting
1

Hi,

How to correctly keep a couple of logically related mesh components in my class? (think sides of a dice that I want to be separate meshes)

(In the example below I use a UCustomMeshComponent which inherits from UMeshComponent)
It did work for me either by doing:

UPROPERTY()
TSubobjectPtr<UCustomMeshComponent> SphereMesh1;
UPROPERTY()
TSubobjectPtr<UCustomMeshComponent> SphereMesh2;
//etc...

or

TArray<TSubobjectPtr<UCustomMeshComponent> > Sides;

However the latter one has some issues - for example cannot add an UPROPERTY() tag to it, as it crashes the engine (not being able to cast TArray to a property) and causes my custom meshes to disappear after I go to play mode and then exit from it.
The first one on the other hand is not very versatile…

Or maybe there is a better way to do it?

2

Thanks, great answer, that’s exactly what I needed.

3

#Static

if it is always 6 sides you can use a static array

UPROPERTY()
TSubobjectPtr < UCustomMeshComponent > Sides[6];

#Dynamic

Use a USTRUCT()

USTRUCT()
struct FSubObjStruct
{
	GENERATED_USTRUCT_BODY()
	
	TArray < TSubobjectPtr < UCustomMeshComponent > > Comps;
	
	int32 GetCount() const
	{
		return Sides.Num();
	}
	//Constructor
	FSubObjStruct()
	{
	}
};  

//now you can use UPROPERTY()

UPROPERTY()
FSubObjStruct Sides;

#Ex:

Sides.Comps.Add(new subobj);
4

Why not create the array variable in the derived blueprint and make a function in the c++ class that takes the array in from the blueprint and then call that function in the blueprint?

5

I’m attempting to do something similar, but my objects aren’t actually being exposed to the editor. When I try

UPROPERTY(EditAnywhere)
UPaperSpriteComponent* DoorSprite[9];

…the first object is exposed, but none of the rest are. If I instead try to expose them individually, none of them are:

for (uint8 i = 0; i < _NumberOfDoors; i++){
     UPROPERTY(EditAnywhere)
     DoorSprite[i] = CreateDefaultSubobject<UPaperSpriteComponent>(*(FString::Printf(TEXT("DoorSprite_%u"), i)));
     DoorSprite[i]->AttachTo(Root, NAME_None, EAttachLocation::KeepWorldPosition);
}
6

were you ever able to find a solution? I am facing the same issue, can’t have a dynamic array of exposed meshes.

7

TSubobjectPtr is deprecated so this whole answer no longer works. What would be the correct way to do this now using CreateDefaultSubobject?