Added nicer public interface to the envelope_3 functions.

Envelope_3/include/CGAL/envelope_3.h

@@ -0,0 +1,48 @@
+// Copyright (c) 2006  Tel-Aviv University (Israel).
+// All rights reserved.
+//
+// This file is part of CGAL (www.cgal.org); you may redistribute it under
+// the terms of the Q Public License version 1.0.
+// See the file LICENSE.QPL distributed with CGAL.
+//
+// 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)     : Ron Wein     <wein@post.tau.ac.il>
+
+#ifndef ENVELOPE_3_H
+#define ENVELOPE_3_H
+
+#include <CGAL/Envelope_pm_dcel.h>
+#include <CGAL/Envelope_caching_traits_3.h>
+#include <CGAL/Envelope_overlay_functor.h>
+
+#include <iostream>
+
+CGAL_BEGIN_NAMESPACE
+
+template <class Traits3> class Envelope_diagram_2 :
+  public Arrangement_2<Envelope_caching_traits_3<Traits>,
+                       Envelope_pm_dcel<Envelope_caching_traits_3<Traits>,
+                                        typename Envelope_caching_traits_3<Traits>::Xy_monotone_surface_3> >
+{
+};
+
+template <class InputIterator, class Traits3>
+void lower_envelope_3 (InputIterator begin, InputIterator end,
+                       Envelope_diagram_2<Traits3>& min_diagram);
+
+template <class InputIterator, class Traits3>
+void upper_envelope_3 (InputIterator begin, InputIterator end,
+                       Envelope_diagram_2<Traits3>& max_diagram);
+
+CGAL_END_NAMESPACE
+
+#endif