diff --git a/EGkPolygon3d.h b/EGkPolygon3d.h
index 2a7c520..f903c8e 100644
--- a/EGkPolygon3d.h
+++ b/EGkPolygon3d.h
@@ -41,12 +41,15 @@ class Polygon3d
                                                const Point3d& ptMin, const Point3d& ptMax) ;
       EGK_EXPORT bool Trim( const Plane3d& plPlane, bool bInVsOut, bool bOnEq) ;
       EGK_EXPORT bool Trim( const Polygon3d& plyOther, bool bInVsOut, bool bOnEq) ;
+      EGK_EXPORT bool Add( const Polygon3d& plyOther) ;
       EGK_EXPORT bool IsValid( void) const
                             { return ! m_Plane.GetVersN().IsSmall() ; }
       EGK_EXPORT const Plane3d& GetPlane( void) const
                             { return m_Plane ; }
       EGK_EXPORT const Vector3d& GetVersN( void) const
                             { return m_Plane.GetVersN() ; }
+      EGK_EXPORT double GetPlaneDist( void) const
+                            { return m_Plane.GetDist() ; }
       EGK_EXPORT int  GetSideCount( void) const
                             { return ( IsValid() ? int( m_vVert.size()) : 0) ; }
       EGK_EXPORT const PNTVECTOR& GetVertices( void) const