diff --git a/EGkBBox3d.h b/EGkBBox3d.h
index 3b9bd48..125c4fa 100644
--- a/EGkBBox3d.h
+++ b/EGkBBox3d.h
@@ -122,13 +122,9 @@ class EGK_EXPORT BBox3d
                 if ( dSqDist < EPS_ZERO)
                    return 0 ;
                 return sqrt( dSqDist) ; }
-      std::vector<Point3d> GetVertices() const ;
-      Point3d GetVertex( int nVert) const ;
-      bool Overlaps( const Frame3d& frThis, const BBox3d& bbOther, const Frame3d& frOther) const ;
 
    private :
       bool IsValid( void) const ;
-      int ChooseVertex( const Vector3d& vtDir) const ;
 
    private :
       Point3d m_ptMin ;
@@ -167,3 +163,9 @@ GetLocToLoc( const BBox3d& b3Box, const Frame3d& frOri, const Frame3d& frDest)
    b3New.LocToLoc( frOri, frDest) ;
    return b3New ;
 }
+
+//----------------------------------------------------------------------------
+inline bool Overlaps( const BBox3d& bbA, const Frame3d& frA, const BBox3d& bbB, const Frame3d& frB)
+{
+   return bbA.Overlaps( GetToLoc( frB, frA), bbB) ;
+}
\ No newline at end of file
diff --git a/EGkPlane3d.h b/EGkPlane3d.h
index 0e896f8..c683873 100644
--- a/EGkPlane3d.h
+++ b/EGkPlane3d.h
@@ -19,12 +19,6 @@
 //-----------------------------------------------------------------------------
 class Plane3d
 {
-public:
-   enum Side { POS = + 1,
-               NEG = - 1,
-               ON = 0
-              } ;
-
    public :
       Plane3d( void) : m_vtN( V_NULL), m_dDist( 0) {}
       bool Set( double dDist, const Vector3d& vtN)
@@ -180,33 +174,8 @@ AreSamePlaneApprox( const Plane3d& plPlaneA, const Plane3d& plPlaneB)
 
 //-----------------------------------------------------------------------------
 inline bool
-AreSamePlaneExact( const Plane3d plPlaneA, const Plane3d& plPlaneB)
+AreSamePlaneExact( const Plane3d& plPlaneA, const Plane3d& plPlaneB)
 {
    return ( AreSameVectorExact( plPlaneA.GetVersN(), plPlaneB.GetVersN())  &&
             PointInPlaneExact( plPlaneA.GetPoint(), plPlaneB)) ;
 }
-
-//-----------------------------------------------------------------------------
-inline int
-OnWhichSide( const Plane3d plPlane, const Point3d& pt)
-{
-   Vector3d vtDir = pt - plPlane.GetPoint() ;
-   if ( ! vtDir.Normalize()) {
-      // cerco un punto diverso sul piano per calcolare la direzione del punto
-      // mi aspetto che pt fosse troppo vicino all'origine del piano
-      Vector3d vtX = plPlane.GetVersN() ^ ( pt - ORIG) ;
-      Point3d ptOrig2 = plPlane.GetPoint() + vtX * 5 ;
-      vtDir = pt - ptOrig2 ;
-      vtDir.Normalize() ;
-   }
-   double dSide = vtDir * plPlane.GetVersN() ;
-   int nSide ;
-   if ( abs( dSide) < EPS_SMALL)
-      nSide = Plane3d::Side::ON ;
-   else if ( dSide > 0)
-      nSide = Plane3d::Side::POS ;
-   else
-      nSide = Plane3d::Side::NEG ;
-   
-   return nSide ;
-}