diff --git a/SurfTriMesh.cpp b/SurfTriMesh.cpp
index 18f4955..b6d9083 100644
--- a/SurfTriMesh.cpp
+++ b/SurfTriMesh.cpp
@@ -189,7 +189,8 @@ SurfTriMesh::GetNextTriangle( int nId, Triangle3d& Tria) const
   // recupero i dati
    Tria.Set( m_vVert[m_vTria[nId].nIdVert[0]].ptP,
              m_vVert[m_vTria[nId].nIdVert[1]].ptP,
-             m_vVert[m_vTria[nId].nIdVert[2]].ptP) ;
+             m_vVert[m_vTria[nId].nIdVert[2]].ptP,
+             m_vTria[nId].vtN) ;
   // ritorno indice triangolo corrente
    return nId ;  
 }