[Paraview] ExtractSelection with ids: scripting example

[Cory Quammen]

Livia,

The IDs list passed to IDSelectionSource takes processorID and point/cell
ID pairs. Your IDs was set to [0, 1], which means "select point 1 from
processor 0". To select points 0, 1, and 2, for example, set your IDs
setting to [0, 0, 0, 1, 0, 2].

See the data descriptor for IDs at [1].

HTH,
Cory

[1]
http://www.paraview.org/ParaView3/Doc/Nightly/www/py-doc/paraview.simple.IDSelectionSource.html



On Thu, Oct 15, 2015 at 5:31 AM, <livia.barazzetti at istb.unibe.ch> wrote:

> Hi,
>
> I would like to use the ExtractSelection filter by providing an ID List,
> as hinted in the doc
> http://www.paraview.org/ParaView3/Doc/Nightly/www/py-doc/paraview.simple.ExtractSelection.html?highlight=extractselection#paraview.simple.ExtractSelection
>
>
>
> What is the correct syntax? First I tried :
>
>
>
> e = ExtractSelection(Sphere1, [1,2])
>
> Traceback (most recent call last):
>
> File "<console>", line 1, in <module>
>
> File "R:\ParaView
> 4.4.0\lib\paraview-4.4\site-packages\paraview\simple.py", line 1520, in
> CreateObject
>
> raise RuntimeError, "Expecting a proxy as input."
>
> RuntimeError: Expecting a proxy as input.
>
>
>
>
>
> Then I tried:
>
>
>
> >>> selection = paraview.simple.IDSelectionSource(ContainingCells=0,
> FieldType = "POINT", IDs = [0,1])
>
> >>> e = ExtractSelection(Sphere1, Selection = selection)
>
> >>> e.UpdatePipeline()
>
> >>> e.GetDataInformation().GetNumberOfPoints()
>
> 1L
>
> #I expected 2 points
>
>
>
> and then, when I tried to visualize the result, I got:
>
>
>
> ERROR: In
> C:\bbd\b51c3c7f\source-paraview\ParaViewCore\ServerManager\Rendering\vtkSMParaViewPipelineControllerWithRendering.cxx,
> line 542
>
> vtkSMParaViewPipelineControllerWithRendering (000000000C747260): Data
> cannot be shown in the defaulted render view!!
>
>
>
> Thanks
>
> Livia
>
>
>
> Livia Barazzetti
> Ph.D. Student - Medical Image Analysis
> Institute for Surgical Technology and Biomechanics
> University of Bern
> Stauffacherstrasse 78
> CH-3014 Bern
> Tel +41 31 631 59 48
> http://www.istb.unibe.ch
>
>
>
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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