Looks nice, when the dust settles, it would be nice to have an article and guidelines as to the use of vtkNew/vtkSmartPointer/vtkWeakPointer since this is now a bit dated: A Tour of VTK Pointer Classes also I attempted to introduce a section in the VTK TextBook, section: 3.11.2 VTK Pointer Classes. The original text book was written well before smart pointers so I rewrote most of the code in the PDF version of the textbook to mainly use vtkNew, sometimes vtkWeakPointer (e.g. Fig 3-25) reserving vtkSmartPointer for uses like in std::vector.