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

[Christian Bauer]

Anybody? =(

Begin forwarded message:

> From: Christian Bauer <christian.bauer at rwth-aachen.de>
> Subject: Select cells within vtkPolyData object using a query string
> Date: 17 Jun 2014 10:53:08 GMT+2
> To: vtkusers at vtk.org
> 
> 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
> OpenPGP: http://keys.gnupg.net/pks/lookup?op=get&search=0x5AA452D5F31608DA
> 

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