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diff --git a/src/GudhUI/view/Viewer_instructor.h b/src/GudhUI/view/Viewer_instructor.h
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+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       David Salinas
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef VIEW_VIEWER_INSTRUCTOR_H_
+#define VIEW_VIEWER_INSTRUCTOR_H_
+
+// todo do a viewer instructor that have directely a pointer to a QGLviewer and buffer ot not triangles
+
+#include <QFileDialog>
+#include <QKeyEvent>
+#include <QGLViewer/camera.h>
+
+#include <memory>
+#include <utility>  // for pair<>
+
+#include "model/Complex_typedefs.h"
+
+#include "Projector3D.h"
+#include "View_parameter.h"
+#include "Viewer.h"
+
+class Viewer;
+class Viewer_parameter;
+
+class Viewer_instructor : public QWidget {
+  Q_OBJECT
+
+  typedef Geometry_trait::Point_3 Point_3;
+  typedef Complex::Point Point;
+  typedef Complex::Vertex_handle Vertex_handle;
+  typedef Complex::Edge_handle Edge_handle;
+  typedef Complex::Simplex Simplex;
+
+  Viewer* viewer_;
+  View_parameter view_params_;
+  const Complex& mesh_;
+  std::unique_ptr<Projector3D> projector_;
+
+ public:
+  Viewer_instructor(QWidget* parent, Viewer* viewer, const Complex& mesh);
+
+  void initialize_bounding_box();
+
+  std::pair<Point, Point> compute_bounding_box_corners();
+
+  void show_entire_scene();
+
+  const qglviewer::Camera* camera() const;
+
+  int width() const;
+  int height() const;
+
+  /**
+   * to change display parameters
+   */
+  View_parameter& view_params();
+
+ public:
+  /**
+   * gives instructions to the viewer
+   */
+  void give_instructions();
+
+  void draw_edges();
+  void draw_triangles();
+  void draw_points();
+
+  void draw_edge(const Point&, const Point&);
+
+  void draw_point(const Point&);
+
+  /**
+   * set the right color of vertex/edge/triangle considering the view_params choice
+   */
+  void set_color_vertex(Vertex_handle vh);
+  void set_color_edge(Edge_handle eh);
+
+  void set_color_triangle(const Simplex& triangle);
+
+ private:
+  /**
+   * Projection to 3D needed for the viewer.
+   */
+  Point_3 proj(const Point& p) const;
+
+ public slots:
+  void sceneChanged();
+  void change_draw_vertices();
+  void change_draw_edges();
+  void change_draw_triangles();
+  void change_light();
+};
+
+#endif  // VIEW_VIEWER_INSTRUCTOR_H_