[Paraview] Support for Graphs in Paraview

[David Doria]

I have some filters that make graphs on point clouds. They currently derive
from vtkGraphAlgorithm and then in FillInputPortInformation they accept a
vtkDataSet instead of a vtkGraph. The output remains a vtkGraph. To
visualize these things in Paraview, I have been using vtkGraphToPolyData to
convert the graph to a polydata data which can be written to a vtp file.

My question is: if I want to make a plugin for these graph-on-point-set
creation filters, should I make a wrapper class that derives from
vtkPolyDataAlgorithm and simply calls my class (which produces a vtkGraph)
followed by a call to vtkGraphToPolyData? Or is there a way that Paraview
can handle a vtkGraph output object directly?

Thanks,

David
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