diff --git a/EGkGeoCollection.h b/EGkGeoCollection.h
index 477a65e..30d6c60 100644
--- a/EGkGeoCollection.h
+++ b/EGkGeoCollection.h
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2013-2014
+//  EgalTech 2014-2019
 //----------------------------------------------------------------------------
-// File : EgkGeoCollection.h       Data : 10.01.14          Versione : 1.5a2
+// File : EgkGeoCollection.h       Data : 05.11.19          Versione : 2.1k1
 // Contenuto : Raccolte di oggetti geometrici.       
 //
 //
@@ -48,5 +48,5 @@ typedef std::list<Vector3d>    VCT3DLIST ;     // lista di vettori 3d
 //----------------------------------------------------------------------------
 // Raccolte di BBox3d
 typedef std::vector<BBox3d>  BOXVECTOR ;                   // vettore di bounding box 3d
-typedef std::list<BBox3d>  BOXLIST ;                       // lista di bounding box 3d
+typedef std::list<BBox3d>    BOXLIST ;                     // lista di bounding box 3d
 typedef std::vector<std::pair<BBox3d,int>>  BOXIVECTOR ;   // vettore di bounding box 3d e Id
diff --git a/EGkPolygon3d.h b/EGkPolygon3d.h
index d71ba0d..8829e98 100644
--- a/EGkPolygon3d.h
+++ b/EGkPolygon3d.h
@@ -31,6 +31,7 @@ class Polygon3d
 {
    public :
       EGK_EXPORT bool Clear( void) ;
+      EGK_EXPORT bool ClearSides( void) ;
       EGK_EXPORT bool FromRectangle( double dDimX, double dDimY) ;
       EGK_EXPORT bool FromPolyLine( const PolyLine& PL) ;
       EGK_EXPORT bool FromPlaneTrimmedWithBox( const Plane3d& plPlane, const Point3d& ptMin, const Point3d& ptMax) ;
@@ -70,3 +71,8 @@ class Polygon3d
       Plane3d   m_Plane ;                 // piano in cui giace il poligono
       PNTVECTOR m_vVert ;                 // elenco ordinato dei vertici del poligono (CCW da Z+ piano)
 } ;
+
+//----------------------------------------------------------------------------
+// Raccolte di Polygon3d
+typedef std::vector<Polygon3d>  POLYGVECTOR ;              // vettore di poligoni
+typedef std::list<Polygon3d>    POLYGLIST ;                // lista di poligoni