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diff --git a/src/GudhUI/view/Projector3D.h b/src/GudhUI/view/Projector3D.h
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+++ b/src/GudhUI/view/Projector3D.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_PROJECTOR3D_H_
+#define VIEW_PROJECTOR3D_H_
+
+#include "model/Complex_typedefs.h"
+
+class Projector3D {
+ public:
+  typedef Geometry_trait::Point Point;
+  typedef Geometry_trait::Point_3 Point_3;
+
+  virtual Point_3 operator()(const Point&) const = 0;
+
+  virtual ~Projector3D() { }
+};
+
+#endif  // VIEW_PROJECTOR3D_H_