[vtkusers] Number of points in a KdTree?

[Bill Lorensen]

I think the problem is that there is not a dataset associated with the
kdtree if you build it from points.

If you build it from a dataset, there will probably be a dataset.

Just a guess...

On Mon, Oct 26, 2009 at 3:17 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Mon, Oct 26, 2009 at 2:58 PM, Paul Edwards <paul.m.edwards at gmail.com> wrote:
>> The original data should be returned with vtkKdTree::GetDataSets()
>>
>> Regards,
>> Paul
>
> That's what I thought... Here's what I tried:
>
>        vtkSmartPointer<vtkPoints> Points = vtkSmartPointer<vtkPoints>::New();
>  Points->InsertNextPoint(0.0, 0.0, 0.0);
>  Points->InsertNextPoint(1.0, 0.0, 0.0);
>  Points->InsertNextPoint(0.0, 1.0, 0.0);
>
>        //get the number of points the file contains
>        vtkIdType NumPoints = Points->GetNumberOfPoints();
>  vtkstd::cout << "There are " << NumPoints << " points." << vtkstd::endl;
>
>        //Create the tree
>  vtkSmartPointer<vtkKdTree> KDTree = vtkSmartPointer<vtkKdTree>::New();
>        KDTree->BuildLocatorFromPoints(Points);
>
>  vtkstd::cout << "Number of points in tree: " <<
> KDTree->GetDataSets()->GetNextDataSet()->GetNumberOfPoints() <<
> vtkstd::endl;
>  //vtkstd::cout << "Number of points in tree: " <<
> KDTree->GetDataSet(0)->GetNumberOfPoints() << vtkstd::endl;
>
>
> It segfaults on either of those last two lines which are supposed to
> output the number of points.
>
> Thoughts?
>
> Thanks,
>
> David
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