[Paraview] Difficulty in using threshold in a script

[Jonathan Stott]

Hi all

I've been using paraview for a while, but I've recently aquirred the
need to do a lot of visualisations all at once, to save as pngs, so I
thought I would try scripting the commands.  Starting with the example
in the help, and looking through the threshold docs, as I understand
them (I've never programmed python before) I managed to get this
together:

from paraview import servermanager
if not servermanager.ActiveConnection:
	connection = servermanager.Connect()
	
reader = servermanager.sources.LegacyVTKFileReader(FileNames="D:\hetero_atrium\court0000.vtk")

thresh = servermanager.filters.Threshold(Input=reader,
ThresholdBetween=[-100,100])

view = servermanager.CreateRenderView()
rep = servermanager.CreateRepresentation(thresh, view)

view.ResetCamera()
view.StillRender()

which should, I think, read in the input file, apply a threshold of
-100 to 100 and then display the centred view on screen.  However, it
doesn't and instead I just see an empty box.  'Manual' visualization
confirms that the datafile is valid and shouldn't render as black for
the same threshold values.

Any pointers would be appreciated.

Regards,
Jon