[vtkusers] Select cells within vtkPolyData object using a query string

[David E DeMarle]

Slight correction to what Miro said, QUERY() seems to be a paraview
specific extension.

You can see the implementation of it
in ParaViewCore/ClientServerCore/Core/vtkPVExtractSelection.cxx




David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Tue, Jun 17, 2014 at 3:15 PM, Miro Drahos <mdrahos at robodoc.com> wrote:

>  It seems vtkSelectionNode::QUERY is not implemented. If you look at the
> source code, there is no case for it, so it defaults to error message and
> returns. Use an alternative selection (e.g. by indices).
> Miro
>
>
>
> On 06/17/2014 01:53 AM, Christian Bauer wrote:
>
> Hi all,
>
>  I currently try to use the VTK C++ library, more precisely I try to
> extract a selection by using a query string.
> Sadly I receive this error message from within vtk:
>
>   ERROR: In ~/git/VTK/Filters/Extraction/vtkExtractSelection.cxx, line 365
>  vtkExtractSelection (0x7f8dd061ed30): Unrecognized CONTENT_TYPE: 9
>
>
>  The following part of the code produces the error:
>
>    selection_node->SetFieldType(vtkSelectionNode::CELL); // select cells
>   selection_node->SetContentType(vtkSelectionNode::QUERY); // use query
> string for selection
>   selection_node->SetQueryString("scalars[:,0] == 1");
>   selection->AddNode(selection_node);
>   extract_selection->SetInputData(0,bounding_poly); // a vtkPolyData
> object containing a triangulation
>   extract_selection->SetInputData(1,selection);
>   extract_selection->Update();
>
>
>  So my question is: How can I implement the selection by a query string?
>
>  Best
> Christian Bauer
>    --
> Christian Bauer
> Student
> Computational Engineering Science, B. Sc.
> RWTH Aachen University
> E-Mail: christian.bauer at rwth-aachen.de
> <christian.bauer at rwth-aachen.de?subject=>
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>
>
>
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