[Paraview] ExtractSelection() and SelectionQuerySource() in Python shell

[Antti Vanne]

Got this working by setting input explicitly. Though I'm not quite
following the magic Render() does with the proxies... This script runs fine
in Python shell

from paraview.simple import *

inp = GetActiveSource()
ex = ExtractSelection()
sqs = SelectionQuerySource(FieldType="POINT", QueryString =
"mag(Surface_pressure) >= 100")
ex.Selection = sqs
ex.Input = inp
Render()
Show(ex)
Render()




2013/6/12 Antti Vanne <antti.vanne at kuava.fi>

> Hi there,
>
> I'm running Paraview 4.0 RC 2 and trying to make a selection from Python
> shell. First I used the Find Data dialog with Python trace to get on track
> and then do it all from the shell.
>
> I have a Legacy VTK source with 2Tuple point data, and would like to
> extract a selection based on the point data magnitude (Surface_pressure).
> The following commands are given in the shell:
>
> ex = ExtractSelection()
>
> sqs = SelectionQuerySource( ProcessID=-1,
> QueryString='mag(Surface_pressure) >= 100', HierarchicalIndex=-1,
> FieldType='POINT', HierarchicalLevel=-1)
> ex.Selection = sqs
> Show()
>
> but I get the following runtime exception
>
> Traceback (most recent call last):
>
> File "<console>", line 1, in <module>
>
> File
> "/usr/local/ParaView-4.0.0-RC2-Linux-64bit/lib/paraview-4.0/site-packages/paraview/simple.py",
> line 300, in Show
>
> raise RuntimeError, "Could not create a representation object for proxy
> %s" % proxy.GetXMLLabel()
>
> RuntimeError: Could not create a representation object for proxy
> SelectionQuerySource
>
> The Python trace does not help as it does not show any proxy handling. Is
> this a proxy issue or something else? Thanks.
>
>
>


-- 
Antti Vanne
Kuava Oy
Microkatu 1
PL 1188
70211 Kuopio Finland
tel. +358 50 356 6744
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