diff --git a/LUA_GeoSnap.cpp b/LUA_GeoSnap.cpp
index f97df92..b68e29d 100644
--- a/LUA_GeoSnap.cpp
+++ b/LUA_GeoSnap.cpp
@@ -866,6 +866,41 @@ LuaSurfTmFacetsContact( lua_State* L)
    return 4 ;
 }
 
+//----------------------------------------------------------------------------
+static int
+LuaSurfTmLineInters( lua_State* L)
+{
+  // 3 o 4 parametri : Id, ptP, vtDir [, nRefId]
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   Point3d ptP ;
+   LuaCheckParam( L, 2, ptP)
+   Vector3d vtDir ;
+   LuaCheckParam( L, 3, vtDir)
+   int nRefType = nId ;
+   LuaGetParam( L, 4, nRefType) ;
+   LuaClearStack( L) ;
+  // recupero i punti di intersezione tra linea e superficie trimesh
+   INTDBLVECTOR vInters ;
+   if ( ExeSurfTmLineInters( nId, ptP, vtDir, nRefType, vInters)) {
+      LuaSetParam( L, true) ;
+      INTVECTOR vType( vInters.size()) ;
+      DBLVECTOR vPar( vInters.size()) ;
+      for ( size_t i = 0 ; i < vInters.size() ; ++ i) {
+         vType[i] = vInters[i].first ;
+         vPar[i] = vInters[i].second ;
+      }
+      LuaSetParam( L, vType) ;
+      LuaSetParam( L, vPar) ;
+   }
+   else {
+      LuaSetParam( L) ;
+      LuaSetParam( L) ;
+      LuaSetParam( L) ;
+   }
+   return 3 ;
+}
+
 //----------------------------------------------------------------------------
 static int
 LuaVolZmapVolume( lua_State* L)
@@ -1019,6 +1054,7 @@ LuaInstallGeoSnap( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmFacetNormVersor", LuaSurfTmFacetNormVersor) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmFacetOppositeSide", LuaSurfTmFacetOppositeSide) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmFacetsContact", LuaSurfTmFacetsContact) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmLineInters", LuaSurfTmLineInters) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapVolume", LuaVolZmapVolume) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapPartCount", LuaVolZmapPartCount) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapPartVolume", LuaVolZmapPartVolume) ;