[vtkusers] number of points in the output increases 10 fold with use of vtkNonMergingPointLocator in vtkClipDataSet filter

[Bill Lorensen]

The clip algorithm will process each polygon inside the clip region
and produce ol\ne point per polygon vertex. Without merging, each
polygon will produce N point, where N is the number of vertices in the
polygon.

On Thu, Jun 23, 2016 at 10:42 AM, sreeram <sayala at ni.com> wrote:
> I am using vtkNonMergingPointLoactor with vtkClipDataSet filter.  This is to
> prevent the filter stripping the duplicate nodes I have added.  Here is the
> code snippet.
>
>                         pPlane->SetNormal(&vdNormal[0]);
>                         pPlane->SetOrigin(&vdOrigin[0]);
>
>                         auto npts = pInput->GetDS()->GetNumberOfPoints();
>                         auto pClipper = vtkSmartPointer<vtkClipDataSet>::New();
>                         pClipper->SetClipFunction(pPlane);
>                         pClipper->SetInputData(pInput->GetDS());
>                         auto locator = vtkSmartPointer<vtkNonMergingPointLocator>::New();
>                         pClipper->SetLocator(locator);
>                         pClipper->Update();
>                         pOutput->Set(pClipper->GetOutput());
>                         auto npts2 = pOutput->GetDS()->GetNumberOfPoints();
>
> For a particular dataset, the number of points in the input dataset is 1546.
> Without using locator, the output contains 1488 points.
>
> The filter is removing 58 duplicate nodes I have added.  These nodes are
> required for rendering purpose.
>
> Using the locator (vtkNonMergingPointLocator), the output contains 26552
> points.
>
> I expect to see 1546 points in the output with sue of
> vtkNonMergingPointLocator.
>
> Can anyone tell what is wrong.
>
> thanks,
>
> Sreeram
>
>
>
>
> --
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