## CGAL::Qt_widget_Nef_3<Nef_polyhedron_3

### Definition

The class Qt_widget_Nef_3 uses the OpenGL interface of Qt to display a Nef_polyhedron_3. Its purpose is to provide an easy to use viewer for Nef_polyhedron_3. There are no means provided to enhance the functionality of the viewer.

In addition to the functions inherited from the Qt class OGLWidget via, Qt_widget_Nef_3 only has a single public constructor. For the usage of Qt_widget_Nef_3 see the example below.

#include <CGAL/IO/Qt_widget_Nef_3.h>

### Parameters

The template parameter expects an instantiation of Nef_polyhedron_3<Traits>.

### Creation

Qt_widget_Nef_3<Nef_polyhedron_3 W ( Nef_polyhedron_3 N);
| Creates a widget W for displaying the 3D Nef polyhedron N.

### See Also

CGAL::Nef_polyhedron_3<Traits>

### Example

This example reads a 3D Nef polyhedron from standard input and displays it in a Qt widget.

    // file: examples/Nef_3/visualization_SNC.C

    #ifndef CGAL_USE_QT
    #include <iostream>
    int main(int, char*){
      std::cout << "Sorry, this demo needs QT..." << std::endl; return 0;}
    #else
    #include <CGAL/Gmpz.h>
    #include <CGAL/Homogeneous.h>
    #include <CGAL/Nef_polyhedron_3.h>
    #include <CGAL/IO/Nef_polyhedron_iostream_3.h>
    #include <CGAL/IO/Qt_widget_Nef_3.h>
    #include <qapplication.h>

    typedef CGAL::Homogeneous<CGAL::Gmpz> Kernel;
    typedef CGAL::Nef_polyhedron_3<Kernel> Nef_polyhedron_3;

    int main(int argc, char* argv[]) {
      Nef_polyhedron_3 N;
      std::cin >> N;

      QApplication a(argc, argv);
      CGAL::Qt_widget_Nef_3<Nef_polyhedron_3>* w =
        new CGAL::Qt_widget_Nef_3<Nef_polyhedron_3>(N);
      a.setMainWidget(w);
      w->show();
      return a.exec();
    }
    #endif