Creating and populating a spline component at runtime in C++ in Unreal

GenerateSplineComponent.cpp

/**	
* Generate a spline we will later use to extrue a road from a set of points
*/
void ARoadNetwork::GenerateRoadSplines(const TArray<FVector>& InPoints)
{
	// SplineBeingEdited is an Editor Only property we use to see our new component
	// in the details panel as it won't show up otherwise
#if WITH_EDITORONLY_DATA
	if (SplineBeingEdited == nullptr)
	{
#endif
		// create the component
		USplineComponent* SplineComponent = NewObject<USplineComponent>(this);
#if WITH_EDITORONLY_DATA
		// ensure it appears in the details panel
		SplineBeingEdited = SplineComponent;
#endif
		SplineComponent->RegisterComponent();
		SplineComponent->ComponentTags.Add(TEXT("Generated"));
		// set the spline to default state, but with no points
		SplineComponent->ResetToDefault();
		SplineComponent->ClearSplinePoints();
		// Iterate over our input points and add spline points to the spline component
		for (const auto& InPoint : InPoints)
		{
			int32 AddIdx = SplineComponent->GetNumberOfSplinePoints();
			SplineComponent->AddSplinePointAtIndex(InPoint, AddIdx, ESplineCoordinateSpace::Local);
		}
		// ensure spline is updated
		constexpr bool bUpdateSpline = true;
		SplineComponent->SetClosedLoop(bUpdateSpline);
		// attach spline component to root
		FAttachmentTransformRules Rules(FAttachmentTransformRules::KeepRelativeTransform);
		SplineComponent->AttachToComponent(RootComponent, Rules);
	}
}