Could you refer me to some example/class ?<br><br>Thank you.<br><br><div class="gmail_quote">2012/8/1 David E DeMarle <span dir="ltr"><<a href="mailto:dave.demarle@kitware.com" target="_blank">dave.demarle@kitware.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">You've given your extracted vtkPolyData cells but you haven't copied<br>
over the points that those cells refer to.<br>
<br>
Also, why not use a threshold or selection filter to do this?<br>
<br>
David E DeMarle<br>
Kitware, Inc.<br>
R&D Engineer<br>
21 Corporate Drive<br>
Clifton Park, NY 12065-8662<br>
Phone: <a href="tel:518-881-4909" value="+15188814909">518-881-4909</a><br>
<div><div class="h5"><br>
<br>
On Wed, Aug 1, 2012 at 6:08 AM, Gonzalo Amadio <<a href="mailto:gonzaloamadio@gmail.com">gonzaloamadio@gmail.com</a>> wrote:<br>
> Hello everyone. I have a polydata with scalars ( 0,1 or 2 ) in the cells.<br>
> I want to extract all the cells with scalar 1.<br>
> Finally, when I try to print the number of points in the extracted polydata,<br>
> it gives me 0 . What I am missing here?<br>
> Should I construct the points set explicitly?<br>
><br>
>> polydata->GetPolys()->InitTraversal();<br>
>><br>
>><br>
>> int i = 0;<br>
>><br>
>><br>
>><br>
>> while ( polydata->GetPolys()->GetNextCell ( npts, pts ) != 0 )<br>
>> {<br>
>> if (cellScalarsPolydata->GetValue( i ) == 1) // if cell scalar == 1, get<br>
>> it.<br>
>> {<br>
>> extractedCellArray->InsertNextCell(3);<br>
>> extractedCellArray->InsertCellPoint(pts[0]);<br>
>> extractedCellArray->InsertCellPoint(pts[1]);<br>
>> extractedCellArray->InsertCellPoint(pts[2]);<br>
>> }<br>
>> i++;<br>
>> }<br>
>><br>
>><br>
>><br>
>> vtkPolyData* extractedPolyData = vtkPolyData::New();<br>
>> extractedPolyData->SetPolys(extractedCellArray);<br>
>> extractedPolyData->BuildCells();<br>
>><br>
>><br>
>><br>
>> std::cout << "num points" << extractedPolyData->GetNumberOfPoints() <<<br>
>> std::endl; // This gives me 0<br>
><br>
><br>
><br>
> --<br>
> --------<br>
> Gonzalo Amadio<br>
><br>
><br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>--------<br>Gonzalo Amadio<br><br>