[vtkusers] Find closest point

[nuno.jf]

I tried passing the polydata through vtkTriangleFilter before applying
smoothing, but I got the same error.
I attached the source file I'm using: 
http://vtk.1045678.n5.nabble.com/file/n4820603/test.txt test.txt 
I don't understand why does happens. 

//Read polydata 
vtkPolyDataReader * imp1 = vtkPolyDataReader::New();
imp1 -> SetFileName(argv[1]);
imp1 -> Update();
I tried 

vtkPolyData * polydata= vtkPolyData::New();
polydata= imp1 -> GetOutput();
polydata-> Update();

//vtkTriangleFilter
vtkTriangleFilter * teste = vtkTriangleFilter::New();
teste -> SetInput(polydata);
teste -> Update();
	
//WindowedSincPolyDataFilter	
vtkWindowedSincPolyDataFilter * smoother =
vtkWindowedSincPolyDataFilter::New();

smoother->SetInput(teste->GetOutput());  
smoother->SetNumberOfIterations(20);
smoother->SetPassBand(0.1);
smoother->Update();

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