diff --git a/EgkIntersLineSurfBez.h b/EgkIntersLineSurfBez.h
index 69ef158..a6322d0 100644
--- a/EgkIntersLineSurfBez.h
+++ b/EgkIntersLineSurfBez.h
@@ -48,6 +48,15 @@ struct IntLinSbzInfo {
 //! vettore di IntLinSbzInfo
 typedef std::vector<IntLinSbzInfo>  ILSBIVECTOR ;
 
+//-----------------------------------------------------------------------------
+// Costanti tipo intersezione Linea SurfTriMesh dopo filtraggio
+enum LSBiType { LSBT_NONE =  0,
+                LSBT_IN =  1,
+                LSBT_OUT = 2,
+                LSBT_TG_INI = 3,
+                LSBT_TG_FIN = 4,
+                LSBT_TOUCH = 5} ;
+
 //-----------------------------------------------------------------------------
 EGK_EXPORT bool IntersLineSurfBz( const Point3d& ptL, const Vector3d& vtL, double dLen, const ISurfBezier* pSBz,
                                   ILSBIVECTOR& vInfo, bool bFinite = true) ;
@@ -65,3 +74,6 @@ private :
    const ISurfBezier*  m_pSBz ;
    HashGrids2d         m_HGrids ;
 } ;
+
+//-----------------------------------------------------------------------------
+EGK_EXPORT bool FilterLineSurfBzInters( const ILSBIVECTOR& vInfo, INTDBLVECTOR& vInters) ;
\ No newline at end of file