diff --git a/EXE_GdbCreateSurf.cpp b/EXE_GdbCreateSurf.cpp
index dd5bfc2..530b0dd 100644
--- a/EXE_GdbCreateSurf.cpp
+++ b/EXE_GdbCreateSurf.cpp
@@ -1158,7 +1158,7 @@ ExeCreateSurfTmSwept( int nParentId, int nSectId, int nGuideId, bool bCapEnds, d
 
 //-------------------------------------------------------------------------------
 int
-ExeCreateSurfTmRuled( int nParentId, int nPtOrCrvId1, int nPtOrCrvId2, double dLinTol)
+ExeCreateSurfTmRuled( int nParentId, int nPtOrCrvId1, int nPtOrCrvId2, int nType, double dLinTol)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
@@ -1211,7 +1211,7 @@ ExeCreateSurfTmRuled( int nParentId, int nPtOrCrvId1, int nPtOrCrvId2, double dL
       CurveLocal CrvLoc2( pGeomDB, nPtOrCrvId2, frLoc) ;
       bOk = bOk && ( CrvLoc2.Get() != nullptr) ;
      // calcolo la superficie
-      pSTM = ( bOk ? GetSurfTriMeshRuled( CrvLoc1, CrvLoc2, dLinTol) : nullptr) ;
+      pSTM = ( bOk ? GetSurfTriMeshRuled( CrvLoc1, CrvLoc2, nType, dLinTol) : nullptr) ;
    }
   // altrimenti errore
    else
@@ -1224,6 +1224,7 @@ ExeCreateSurfTmRuled( int nParentId, int nPtOrCrvId1, int nPtOrCrvId2, double dL
       string sLua = "EgtSurfTmRuled(" + IdToString( nParentId) + "," +
                                         ToString( nPtOrCrvId1) + "," +
                                         ToString( nPtOrCrvId2) + "," +
+                                        ( nType == ISurfTriMesh::RLT_MINDIST ? "MD" : "IP") + "," +
                                         ToString( dLinTol) + ")" +
                     " -- Id=" + ToString( nNewId) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 65e84e8..9c048a4 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbCreateSurf.cpp b/LUA_GdbCreateSurf.cpp
index 8e1094f..7792d28 100644
--- a/LUA_GdbCreateSurf.cpp
+++ b/LUA_GdbCreateSurf.cpp
@@ -590,19 +590,23 @@ LuaCreateSurfTmSwept( lua_State* L)
 static int
 LuaCreateSurfTmRuled( lua_State* L)
 {
-  // 3 o 4 parametri : ParentId, PtOrCrvId1, PtOrCrvId2, [, dTol]
+  // 3 o 4 o 5 parametri : ParentId, PtOrCrvId1, PtOrCrvId2 [, sType] [, dTol]
    int nParentId ;
    LuaCheckParam( L, 1, nParentId)
    int nPtOrCrvId1 ;
    LuaCheckParam( L, 2, nPtOrCrvId1)
    int nPtOrCrvId2 ;
    LuaCheckParam( L, 3, nPtOrCrvId2)
+   string sType = "IP" ;
    double dLinTol = LIN_TOL_DEF ;
-   if ( lua_gettop( L) >= 4)
-      LuaCheckParam( L, 4, dLinTol) ;
+   if ( LuaGetParam( L, 4, sType))
+      LuaGetParam( L, 5, dLinTol) ;
+   else
+      LuaGetParam( L, 4, dLinTol) ;
    LuaClearStack( L) ;
   // creo STM riempiendo un contorno piano
-   int nId = ExeCreateSurfTmRuled( nParentId, nPtOrCrvId1, nPtOrCrvId2, dLinTol) ;
+   int nType = ( sType == "MD" ? RUL_TYPE_MINDIST : RUL_TYPE_ISOPAR) ;
+   int nId = ExeCreateSurfTmRuled( nParentId, nPtOrCrvId1, nPtOrCrvId2, nType, dLinTol) ;
   // restituisco il risultato
    if ( nId != GDB_ID_NULL)
       LuaSetParam( L, nId) ;