[vtkusers] resampling vtkPoints

[Prathamesh Kulkarni]

Thanks for the direction. I am did the following: (myvtkPoints are points
representative of a contour line which I want to resample with a given
density):

        density = 100;
vtkSmartPointer<vtkPoints> dense_points;
vtkSmartPointer<vtkPoints> sparse_points = myvtkPoints
 vtkSmartPointer<vtkKochanekSpline> spline_type =
vtkSmartPointer<vtkKochanekSpline>::New();
spline_type->SetDefaultContinuity(0.5);

vtkSmartPointer<vtkPolyData> sparse_poly =
vtkSmartPointer<vtkPolyData>::New();
sparse_poly->SetPoints(sparse_points);
sparse_poly->Update();

vtkSmartPointer<vtkSplineFilter> spline_filter =
vtkSmartPointer<vtkSplineFilter>::New();
spline_filter->SetSpline(spline_type);
spline_filter->SetInput(sparse_poly);
spline_filter->SetSubdivideToSpecified();
spline_filter->SetNumberOfSubdivisions(density);
spline_filter->Update();

vtkSmartPointer<vtkPolyData> dense_poly = spline_filter->GetOutput();

dense_points = dense_poly->GetPoints(); //FAILS HERE: dense_points is NULL

int number_of_sparse_points = sparse_points->GetNumberOfPoints();
int number_of_dense_points = dense_points->GetNumberOfPoints();

Could someone please tell me if I am doing something conceptually wrong
here?

Thanks,
Prathamesh

On Thu, Jul 22, 2010 at 12:27 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:

> Look at this example:
> http://www.vtk.org/Wiki/VTK/Examples/PolyData/FitSplineToCutterOutput
> it resamples contour lines using splines.
>
>
> On Thu, Jul 22, 2010 at 12:38 PM, Prathamesh Kulkarni
> <prathameshmkulkarni at gmail.com> wrote:
> >
> > Hello all,
> >
> > I have a set of points which represent a contour line. I want to be able
> to
> > resample them to a given density. I have looked at vvtkSheperdMethod
> > documentation but could not find a method similar SetDensity() for its
> > source.
> >
> > What would be the best way to resample a contour data?
> >
> >
> > Thanks,
> > Prathamesh
> >
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