How to resimulate Procedural Foliage programatically at runtime

Development Programming & Scripting C++
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1

I’m working on a feature to move my procedural foliage generator to the player’s position when certain conditions are met. I’ve got this code so far. I compiles and runs, but no foliage is generated.

void AddFoliageInstancesCallback(const TArray<FDesiredFoliageInstance>& Instances)
{
    // Not sure what to do here
}

void AFoliageManager::ReRunSimulation()
{
    if (ProceduralFoliageVolume->IsValidLowLevel())
    {
        ProceduralFoliageGenerator = ProceduralFoliageVolume->GetComponentByClass<UProceduralFoliageComponent>();
    }
    
    if (ProceduralFoliageGenerator)
    {
        FVector PlayerPosition = GetWorld()->GetFirstPlayerController()->GetPawn()->GetActorLocation();
        PlayerPosition.Z = 820;
        ProceduralFoliageVolume->SetActorLocation(PlayerPosition);

        // Create a TFunctionRef from the function
        TFunctionRef<void(const TArray<FDesiredFoliageInstance>&)> FuncRef = 
            TFunctionRef<void(const TArray<FDesiredFoliageInstance>&)>(AddFoliageInstancesCallback);

        if (ProceduralFoliageGenerator->ResimulateProceduralFoliage(FuncRef))
        {
            UE_LOG(LogTemp, Log, TEXT("Foliage generation successful"));
        }
    }
}

I suppose I’m missing a step or something, because I also don’t really know what to do in the AddInstanceFunc callback. Alas, the documentation doesn’t go into any detail. Has anyone tried something like this before? Any pointers?