diff --git a/EGrScene.h b/EGrScene.h
index 13902b1..ae68d5d 100644
--- a/EGrScene.h
+++ b/EGrScene.h
@@ -65,6 +65,9 @@ class IEGrScene
       virtual bool ZoomChange( double dCoeff) = 0 ;
       virtual bool ZoomOnPoint( const Point3d& ptWin, double dCoeff) = 0 ;
       virtual bool ZoomWin( const Point3d& ptWin1, const Point3d& ptWin2) = 0 ;
+     // ShowMode
+      virtual bool SetShowMode( int nShowMode) = 0 ;
+      virtual int  GetShowMode( void) = 0 ;
      // Geometry
       virtual bool SetExtension( const BBox3d& b3Ext) = 0 ;
       virtual bool UpdateExtension( void) = 0 ;
@@ -95,3 +98,7 @@ enum CameraDir { CT_NONE = 0,
                  CT_ISO_SE = 8,
                  CT_ISO_NE = 9,
                  CT_ISO_NW = 10} ;
+//------------------------ Costanti per tipo di visualizzazione --------------
+enum ShowMode { SM_WIREFRAME = 0,
+                SM_HIDDENLINE = 1,
+                SM_SHADING = 2} ;
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