diff --git a/EXE_GdbObjects.cpp b/EXE_GdbObjects.cpp
index 881bf6c..9c79875 100644
--- a/EXE_GdbObjects.cpp
+++ b/EXE_GdbObjects.cpp
@@ -44,13 +44,23 @@ ExeGetParent( int nId)
    return pGeomDB->GetParentId( nId) ;
 }
 
+//-----------------------------------------------------------------------------
+bool
+ExeGetGlobFrame( int nId, Frame3d& frGlob)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero il riferimento globale in cui è immerso l'oggetto
+   return pGeomDB->GetGlobFrame( nId, frGlob) ;
+}
+
 //-----------------------------------------------------------------------------
 bool
 ExeGetGroupGlobFrame( int nId, Frame3d& frGlob)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, false)
-  // recupero il riferimento globale del gruppo
+  // recupero il riferimento globale del gruppo (in cui sono immersi i suoi oggetti figli)
    return pGeomDB->GetGroupGlobFrame( nId, frGlob) ;
 }
 
diff --git a/EXE_GeoSnap.cpp b/EXE_GeoSnap.cpp
index 7103ad5..f8d428e 100644
--- a/EXE_GeoSnap.cpp
+++ b/EXE_GeoSnap.cpp
@@ -510,10 +510,8 @@ ExeCurveDomain( int nId, double* pdStart, double* pdEnd)
       return false ;
   // recupero la curva
    ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
-   if ( pCurve == nullptr)
-      return false ;
   // recupero il dominio
-   return pCurve->GetDomain( *pdStart, *pdEnd) ;
+   return ( pCurve != nullptr  &&  pCurve->GetDomain( *pdStart, *pdEnd)) ;
 }
 
 //----------------------------------------------------------------------------
@@ -527,10 +525,8 @@ ExeCurveLength( int nId, double* pdLen)
       return false ;
   // recupero la curva
    ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
-   if ( pCurve == nullptr)
-      return false ;
   // recupero la lunghezza
-   return pCurve->GetLength( *pdLen) ;
+   return ( pCurve != nullptr  &&  pCurve->GetLength( *pdLen)) ;
 }
 
 //----------------------------------------------------------------------------
@@ -586,7 +582,7 @@ ExeCurveIsClosed( int nId)
   // recupero la curva
    ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
   // verifico se chiusa
-   return pCurve->IsClosed() ;
+   return ( pCurve != nullptr  &&  pCurve->IsClosed()) ;
 }
 
 //----------------------------------------------------------------------------
@@ -601,7 +597,7 @@ ExeCurveIsFlat( int nId, Plane3d& Plane)
   // recupero la curva
    ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
   // ne verifico la planarità
-   return pCurve->IsFlat( Plane) ;
+   return ( pCurve != nullptr  &&  pCurve->IsFlat( Plane)) ;
 }
 
 //----------------------------------------------------------------------------
@@ -616,7 +612,7 @@ ExeCurveAreaXY( int nId, double& dArea)
   // recupero la curva
    ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
   // determino l'area nel piano XY
-   return pCurve->GetAreaXY( dArea) ;
+   return ( pCurve != nullptr  &&  pCurve->GetAreaXY( dArea)) ;
 }
 
 //----------------------------------------------------------------------------
@@ -631,7 +627,7 @@ ExeCurveArea( int nId, Plane3d& Plane, double& dArea)
   // recupero la curva
    ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
   // determino il piano medio della curva e la sua area su di esso (deve essere chiusa)
-   return pCurve->GetArea( Plane, dArea) ;
+   return ( pCurve != nullptr  &&  pCurve->GetArea( Plane, dArea)) ;
 }
 
 //----------------------------------------------------------------------------
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index eb58aab..944ba9c 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbObjects.cpp b/LUA_GdbObjects.cpp
index bd6ae46..7f84ca2 100644
--- a/LUA_GdbObjects.cpp
+++ b/LUA_GdbObjects.cpp
@@ -68,6 +68,40 @@ LuaGetType( lua_State* L)
    return 1 ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+LuaGetGlobFrame( lua_State* L)
+{
+  // 1 parametro : Id
+   int nId = GDB_ID_NULL ;
+   LuaGetParam( L, 1, nId) ;
+   LuaClearStack( L) ;
+  // recupero il frame
+   Frame3d frFrame ;
+   if ( ExeGetGlobFrame( nId, frFrame))
+      LuaSetParam( L, frFrame) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
+//-------------------------------------------------------------------------------
+static int
+LuaGetGroupGlobFrame( lua_State* L)
+{
+  // 1 parametro : Id
+   int nId = GDB_ID_NULL ;
+   LuaGetParam( L, 1, nId) ;
+   LuaClearStack( L) ;
+  // recupero il frame
+   Frame3d frFrame ;
+   if ( ExeGetGroupGlobFrame( nId, frFrame))
+      LuaSetParam( L, frFrame) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
 //-------------------------------------------------------------------------------
 static int
 LuaGetGroupObjs( lua_State* L)
@@ -525,6 +559,8 @@ LuaInstallGdbObjects( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtExistsObj", LuaExistsObj) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtGetParent", LuaGetParent) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtGetType", LuaGetType) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtGetGlobFrame", LuaGetGlobFrame) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtGetGroupGlobFrame", LuaGetGroupGlobFrame) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtGetGroupObjs", LuaGetGroupObjs) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtGetFirstInGroup", LuaGetFirstInGroup) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtGetNext", LuaGetNext) ;