[Paraview-developers] Bug in my reader plugin

[Utkarsh Ayachit]

The problem seems to be that ExtractSelection filter is removing all
data arrays from the dataset when "Preserve Topology" is ON. Since the
dataset was intiailly colored by "color" array -- which is what would
happen by default with the VTK file, when "Preserve Topology" is
checked, the array is lost and ParaView is warning saying that the
array couldn't be found.

I've reported a bug: http://paraview.org/Bug/view.php?id=14450

Utkarsh

On Mon, Dec 9, 2013 at 10:33 AM, Utkarsh Ayachit
<utkarsh.ayachit at kitware.com> wrote:
> Yup, I could reproduce the problem. I'll track it down.
>
> Utkarsh
>
> On Mon, Dec 9, 2013 at 12:40 AM, Lodron, Gerald
> <Gerald.Lodron at joanneum.at> wrote:
>> Ok, below there is an easy vtk file where the described behaviour appears.
>> Simply select one of the two polygons and extract it, then select preserve
>> topology and apply again a second time:
>>
>>
>>
>> # vtk DataFile Version 3.0
>>
>> vtk output
>>
>> ASCII
>>
>> DATASET POLYDATA
>>
>> POINTS 4 float
>>
>> 0 0 0 1 0 0 1 1 0 0 1 0
>>
>> POLYGONS 2 8
>>
>> 3 0 1 2
>>
>> 3 0 2 3
>>
>> POINT_DATA 4
>>
>> COLOR_SCALARS color 3
>>
>> 1 0 0 0 1 0 0 0 1 1 1 0
>>
>>
>>
>>
>>
>> Von: Utkarsh Ayachit [mailto:utkarsh.ayachit at kitware.com]
>> Gesendet: Samstag, 07. Dezember 2013 15:57
>> An: Lodron, Gerald
>> Cc: Paraview Developer (Paraview-developers at paraview.org)
>> Betreff: Re: [Paraview-developers] Bug in my reader plugin
>>
>>
>>
>> Gerald,
>>
>>
>>
>> It's unclear what could be going wrong. Can you share the code and sample
>> files to reproduce the problem?
>>
>>
>>
>> Utkarsh
>>
>>
>>
>> On Fri, Dec 6, 2013 at 3:12 AM, Lodron, Gerald <Gerald.Lodron at joanneum.at>
>> wrote:
>>
>> Hello
>>
>>
>>
>> I made a reader plugin which returns a vtkPolyData object from our internal
>> file type and have following problem:
>>
>>
>>
>> Open our file using plugin, polydata object is successfully loaded and
>> visualized (everything fine)
>>
>> Select some region with “select points through”
>>
>> Apply the ExtractSelection filter, the subset is successfully extracted
>> (unstructured grid), everything seems fine
>>
>> Select Preserve Topology check box in the ExtractSelection object panel
>>
>> Apply again
>>
>>
>>
>> Then following comes into output window:
>>
>>
>>
>> Warning: In
>> D:\Develop\Source\ParaView-v4.1.0-RC1-source\ParaViewCore\ServerManager\Rendering\vtkSMPVRepresentationProxy.cxx,
>> line 279
>>
>> vtkSMPVRepresentationProxy (10CE2020): Could not determine array range.
>>
>>
>>
>> Someone knows what I am doing wrong, this does not appear when I load a
>> normal vtkPolyData .vtk file format so it seems that I am doing something
>> wrong with the reader plugin interface, but what…..
>>
>>
>>
>> Thanks
>>
>> _________________________________________________________________
>>
>>
>>
>> JOANNEUM RESEARCH Forschungsgesellschaft mbH
>>
>>
>>
>> DIGITAL – Institute for Information and Communication Technologies
>>
>> Steyrergasse 17, 8010 Graz, Austria
>>
>>
>>
>> phone: +43 316 876-1751
>>
>> fax: +43 316 8769-1751
>>
>> e-mail: gerald.lodron at joanneum.at
>>
>> web: www.joanneum.at/digital
>>
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