This is an interesting idea with one concern: we’ve done a lot of work over the past several years to reduce dependencies across modules etc. to make it easier to embed parts of VTK into applications. I really don’t like the idea of adding this sort of dependency into the mix. I agree having such a method vtkDataArray* GetPointsDataArray() const might be useful, but adding such a dependency is not worth it IMO. I’m wondering if this could be done without a vtkm dependency.