int main(int argc, char* argv[])

 {

   // Verify input arguments

   if ( argc !=  )

     {

     std::cout << "Usage: " << argv[]

               << " Filename(.xyz)" << std::endl;

     return EXIT_FAILURE;

     }

   // Read the file

   vtkSmartPointer<vtkSimplePointsReader> reader =

     vtkSmartPointer<vtkSimplePointsReader>::New();

   reader->SetFileName ( argv[] );

   reader->Update();

   // Visualize

   vtkSmartPointer<vtkPolyDataMapper> mapper =

     vtkSmartPointer<vtkPolyDataMapper>::New();

   mapper->SetInputConnection(reader->GetOutputPort());

   vtkSmartPointer<vtkActor> actor =

     vtkSmartPointer<vtkActor>::New();

   actor->SetMapper(mapper);

   actor->GetProperty()->SetPointSize();

   vtkSmartPointer<vtkRenderer> renderer =

     vtkSmartPointer<vtkRenderer>::New();

   vtkSmartPointer<vtkRenderWindow> renderWindow =

     vtkSmartPointer<vtkRenderWindow>::New();

   renderWindow->AddRenderer(renderer);

   vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =

     vtkSmartPointer<vtkRenderWindowInteractor>::New();

   renderWindowInteractor->SetRenderWindow(renderWindow);

   renderer->AddActor(actor);

   renderer->SetBackground(., ., .); // Background color green

   renderWindow->Render();

   renderWindowInteractor->Start();

   return EXIT_SUCCESS;

 }