How to get vtkDataSet (cells, points, ...) information from a source in VTK-9?

[dgobbi (David Gobbi)]

@Tomasso

As of VTK-9, GetOutput() is deprecated in favor of GetOutputPort()

GetOutput() is still the best way to get the vtkDataSet, keep using it like you did before. Definitely not deprecated. It’s necessary to call source->Update() before GetOutput(), but that was also true previously.