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+//
+//  Filename         : SilhouetteGeomEngine.h
+//  Author(s)        : Stephane Grabli
+//  Purpose          : Class to perform all geometric operations dedicated 
+//                     to silhouette. That, for example, implies that
+//                     this geom engine has as member data the viewpoint, 
+//                     transformations, projections...
+//  Date of creation : 03/09/2002
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+//
+//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
+//   with this source distribution. 
+//
+//  This program is free software; 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 2
+//  of the License, or (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef  SILHOUETTEGEOMENGINE_H
+# define SILHOUETTEGEOMENGINE_H
+
+# include <vector>
+# include "../system/FreestyleConfig.h"
+# include "../geometry/Geom.h"
+
+using namespace Geometry;
+
+class SVertex;
+class FEdge;
+
+class LIB_VIEW_MAP_EXPORT SilhouetteGeomEngine 
+{
+private:
+  static Vec3r _Viewpoint;   // The viewpoint under which the silhouette has to be computed
+  static real _translation[3];
+  static real _modelViewMatrix[4][4];  // the model view matrix (_modelViewMatrix[i][j] means element of line i and column j)
+  static real _projectionMatrix[4][4]; // the projection matrix (_projectionMatrix[i][j] means element of line i and column j)
+  static real _transform[4][4];        // the global transformation from world to screen (projection included) (_transform[i][j] means element of line i and column j)
+  static int _viewport[4];              // the viewport
+  static real _Focal;
+  
+  static real _znear;
+  static real _zfar;
+
+  static real _glProjectionMatrix[4][4];  // GL style (column major) projection matrix
+  static real _glModelViewMatrix[4][4];  // GL style (column major) model view matrix
+
+  
+  
+  static SilhouetteGeomEngine *_pInstance;
+public:
+  
+  /*! retrieves an instance on the singleton */
+  static SilhouetteGeomEngine * getInstance() 
+  {
+    if(0 == _pInstance)
+    {
+      _pInstance = new SilhouetteGeomEngine;
+    }
+    return _pInstance;
+  }
+
+  /*! Sets the current viewpoint */
+  static inline void SetViewpoint(const Vec3r& ivp) {_Viewpoint = ivp;}
+
+  /*! Sets the current transformation
+   *    iModelViewMatrix
+   *      The 4x4 model view matrix, in column major order (openGL like).
+   *    iProjection matrix
+   *      The 4x4 projection matrix, in column major order (openGL like).
+   *    iViewport
+   *      The viewport. 4 real array: origin.x, origin.y, width, length
+   *    iFocal
+   *      The focal length
+   */
+  static void SetTransform(const real iModelViewMatrix[4][4], const real iProjectionMatrix[4][4], const int iViewport[4], real iFocal) ;  
+
+  /*! Sets the current znear and zfar
+   */
+  static void SetFrustum(real iZNear, real iZFar) ;  
+
+  /* accessors */
+  static void retrieveViewport(int viewport[4]);
+
+  /*! Projects the silhouette in camera coordinates
+   *  This method modifies the ioEdges passed as argument.
+   *    ioVertices
+   *      The vertices to project. It is modified during the 
+   *      operation.
+   */
+  static void ProjectSilhouette(std::vector<SVertex*>& ioVertices);  
+  static void ProjectSilhouette(SVertex* ioVertex);
+
+  /*! transforms the parameter t defining a 2D intersection for edge fe in order to obtain 
+   *  the parameter giving the corresponding 3D intersection.
+   *  Returns the 3D parameter
+   *    fe
+   *      The edge
+   *    t
+   *      The parameter for the 2D intersection.
+   */
+  static real ImageToWorldParameter(FEdge *fe, real t);
+
+  /*! From world to image */
+  static Vec3r WorldToImage(const Vec3r& M);
+};
+
+#endif // SILHOUETTEGEOMENGINE_H