[vtkusers] missing points in polydata

[Gonzalo Amadio]

Could you refer me to some example/class ?

Thank you.

2012/8/1 David E DeMarle <dave.demarle at kitware.com>

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



-- 
--------
Gonzalo Amadio
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