diff --git a/API_GeoSnap.cpp b/API_GeoSnap.cpp
index 9bad4c8..4d1e666 100644
--- a/API_GeoSnap.cpp
+++ b/API_GeoSnap.cpp
@@ -506,18 +506,22 @@ __stdcall EgtSurfTmFacetNormVersor( int nId, int nFacet, int nRefId, double vtNo
 
 //----------------------------------------------------------------------------
 BOOL
-__stdcall EgtSurfTmFacetOppositeSide( int nId, int nFacet, const double vtDir[3], int nRefId, double ptP1[3], double ptP2[3])
+__stdcall EgtSurfTmFacetOppositeSide( int nId, int nFacet, const double vtDir[3], int nRefId,
+                                      double ptP1[3], double ptP2[3], double vtIn1[3], double vtOut2[3])
 {
   // verifica parametri
-   if ( vtDir == nullptr  ||  ptP1 == nullptr  ||  ptP2 == nullptr)
+   if ( vtDir == nullptr  ||  ptP1 == nullptr  ||  ptP2 == nullptr  ||  vtIn1 == nullptr  ||  vtOut2 == nullptr)
       return FALSE ;
   // recupero gli estremi del lato opposto
    Point3d ptMyP1, ptMyP2 ;
-   if ( ! ExeSurfTmFacetOppositeSide( nId, nFacet, vtDir, nRefId, ptMyP1, ptMyP2))
+   Vector3d vtMyIn1, vtMyOut2 ;
+   if ( ! ExeSurfTmFacetOppositeSide( nId, nFacet, vtDir, nRefId, ptMyP1, ptMyP2, vtMyIn1, vtMyOut2))
       return FALSE ;
   // assegno risultati
    VEC_FROM_3D( ptP1, ptMyP1)
    VEC_FROM_3D( ptP2, ptMyP2)
+   VEC_FROM_3D( vtIn1, vtMyIn1)
+   VEC_FROM_3D( vtOut2, vtMyOut2)
    return TRUE ;
 }
 
diff --git a/EgtInterface.rc b/EgtInterface.rc
index a70cf96..3c1ee43 100644
Binary files a/EgtInterface.rc and b/EgtInterface.rc differ