[vtkusers] Issue; Number of Regions are equal to the number of Polys

[David E DeMarle]

Apply vtkCleanPolyData first. The triangles in that data have points that
are coincindent, but none are actually shared across neighboring edges.
Clean will merge the coicident points for you.

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

On Tue, Jan 3, 2017 at 10:22 AM, Mohammadreza Babaee <mrezababaee at gmail.com>
wrote:

> Hi
>
>
> I have a vtp file that contains a polydata. I want to extract its
> connected component. However, when I use* vtkPolyDataConnectivityFilter**,
> *and read the number of regions, it shows that the it is equal to the
> number of polys. But when I visualize the file I see that there are
> actually 4 regions.
>
> I use SetExtractionModeToAllRegions to read the number of regions.
> I have attached the file. Can you please help me to understand what the
> problem is
>
> So here is my code
>
> vtkSmartPointer<vtkPolyDataConnectivityFilter> connectivityFilter =
> vtkSmartPointer<vtkPolyDataConnectivityFilter>::New();
>     connectivityFilter->SetInputData(poly_in);
>     connectivityFilter->ScalarConnectivityOn();
>
>     connectivityFilter->SetExtractionModeToAllRegions();
>
>     connectivityFilter->Update();
>     int nbregions = connectivityFilter->GetNumberOfExtractedRegions();
>
>     cout << "Number of Extracted Regions are=" << nbregions << endl;
>
> Thanks
>
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