text: // Copyright (c) 2010 INRIA Sophia-Antipolis (France).
  // All rights reserved.
  //
  // This file is part of CGAL (www.cgal.org).
  // You can redistribute it and/or modify it under the terms of the GNU
  // General Public License as published by the Free Software Foundation,
  // either version 3 of the License, or (at your option) any later version.
  //
  // Licensees holding a valid commercial license may use this file in
  // accordance with the commercial license agreement provided with the software.
  //
  // This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  // WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  //
  // $URL$
  // $Id$
  //
  //
  // Author(s)     : Stephane Tayeb
  //
  //******************************************************************************
  // File Description : 
  //******************************************************************************
  
  #include <QObject>
  #include "Implicit_function_interface.h"
  
  const double radius = 4.;
  
  class Tanglecube_implicit_function :
    public QObject,
    public Implicit_function_interface
  {
    Q_OBJECT
    Q_INTERFACES(Implicit_function_interface)
    Q_PLUGIN_METADATA(IID "com.geometryfactory.Mesh3Demo.Implicit_function_interface/1.0")
  
  public:
    virtual QString name() const { return "Tanglecube function"; }
    
    virtual double operator()(double x, double y, double z) const
    {
      double x2=x*x, y2=y*y, z2=z*z;
      double x4=x2*x2, y4=y2*y2, z4=z2*z2;
      return x4 - 5*x2 + y4 - 5*y2 + z4 - 5*z2 + 11.8;
    }
    
    virtual Bbox bbox() const
    {
      double r = radius * 1.2;
      return Bbox(-r,-r,-r,r,r,r);
    }
  };
  
  #include "Tanglecube_implicit_function.moc"
  