RadialHexMesh ( const FVector::FReal InnerRadius, const FVector::FReal OuterRadius, const FVector::FReal Height, const int32 RadialSample, const int32 AngularSample, const int32 VerticalSample, const FVector::FReal BulgeDistance, TArray< int32 >& HexElements, TArray< FVector >& HexVertices )