Can’t “Resimultate” the foliage form the Procedural Foliage Tool from code

Development Programming & Scripting C++
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1

Hi!
I’m currently developing an editor widget for unreal that requires me to “Resimulate” the foliage generation using the procedural foliage tool.

344122-capturar.png

Until now I was able to recreate the code from the “Resimulate” button (Figue 1) on click event, see the code bellow, but i am getting an error when I try to compile it even tho Itelisense doesn’t give me any errors.

void ULandscapeHelper::Simulate()
{
	if (!AssignFoliageVolume())
	{
		if(GEngine)
			GEngine->AddOnScreenDebugMessage(-1,
				15.0f,
				FColor::Red,
				TEXT("Failed to get foliage volume"));
		return;
	}

	TArray<FDesiredFoliageInstance> FoliageInstances;
	if (FoliageComponent->GenerateProceduralContent(FoliageInstances))
	{
		if (FoliageInstances.Num() > 0)
		{
			FoliageComponent->RemoveProceduralContent(false);
			
			FFoliagePaintingGeometryFilter OverrideGeometryFilter;
			OverrideGeometryFilter.bAllowLandscape = FoliageComponent->bAllowLandscape;
			OverrideGeometryFilter.bAllowStaticMesh = FoliageComponent->bAllowStaticMesh;
			OverrideGeometryFilter.bAllowBSP = FoliageComponent->bAllowBSP;
			OverrideGeometryFilter.bAllowFoliage = FoliageComponent->bAllowFoliage;
			OverrideGeometryFilter.bAllowTranslucent = FoliageComponent->bAllowTranslucent;
			
			FEdModeFoliage::AddInstances(FoliageComponent->GetWorld(), FoliageInstances, OverrideGeometryFilter, true);
		}
	}
}

The error text:

LNK2019: unresolved external symbol "public: static void __cdecl FEdModeFoliage::AddInstances(class UWorld *,class TArray const &)" (?AddInstances@FEdModeFoliage@@SAXPEAVUWorld@@AEBV?$TArray@UFDesiredFoliageInstance@@VFDefaultAllocator@@@@@Z) referenced in function "public: void __cdecl USpawnTool::ResimulateAll(void)" (?ResimulateAll@USpawnTool@@QEAAXXZ)

I Found this thread where the person asking add the exact problem that I was having but I wasn’t able to implement the described solution. I still get the same error.