[vtkusers] VTK Python Wrapper - Exporting Surface Plot

[Alberti, Anthony Lewis]

Hello all,

I'm using VTK 8.0.1 and python 3.5 and am brand new to VTK. I am trying to
export a surface plot using vtkPlotSurface.

By referencing VTK-8.0.1/Charts/Core/Testing/Cxx/TestSurfacePlot.cxx
<https://www.vtk.org/gitweb?p=VTK.git;a=blob;f=Charts/Core/Testing/Cxx/TestSurfacePlot.cxx>
 I have successfully created a surface plot and have been able to render it
in python (even though it doesn't really look like a surface plot) - see
attached script.

In order to better visualize what I've made, I wanted to try and export it
and then visualize using Paraview/Visit. However, I'm struggling to find
any concrete examples where this type of vtk object is exported...

I have tried running the following:
out = vtk.vtkOBJExporter()
out.SetFilePrefix("test")
out.SetInput(chart)
out.Write()

But end up with the following type error:
TypeError: SetInput argument 1: method requires a vtkRenderWindow, a
vtkContextView was provided.

Can anyone provide assistance? Thanks in advance.
-- Tony
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