diff --git a/EXE_GdbModifyVol.cpp b/EXE_GdbModifyVol.cpp
index 3f57943..eddf97d 100644
--- a/EXE_GdbModifyVol.cpp
+++ b/EXE_GdbModifyVol.cpp
@@ -535,3 +535,29 @@ ExeCutVolZmapPlane( int nId, const Point3d& ptOn, const Vector3d& vtN, int nRefT
   // restituisco risultato
    return bOk ;
 }
+
+//----------------------------------------------------------------------------
+bool
+ExeVolZMapOffset( int nId, double dDist, int nType)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero lo Zmap
+   IVolZmap* pVolZmap = GetVolZmap( pGeomDB->GetGeoObj( nId)) ;
+   bool bOk = ( pVolZmap != nullptr) ;
+  // eseguo l'offset
+   bOk = bOk && pVolZmap->Offset( dDist, nType) ;
+  // se il risultato è vuoto, cancello lo Zmap
+   if ( bOk  &&  ! pVolZmap->IsValid())
+      pGeomDB->Erase( nId) ;
+   ExeSetModified() ;
+  // se richiesto, salvo il comando Lua equivalente
+   if ( IsCmdLog()) {
+      string sLua = "EgtVolZmapOffset(" + ToString( nId) + "," +
+                                          ToString( dDist) + "," +
+                                          ToString( nType) + ")" +
+                    " -- Ok=" + ToString( bOk) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
+   return bOk ;
+}
diff --git a/LUA_GdbModifyVol.cpp b/LUA_GdbModifyVol.cpp
index 96a76df..7332437 100644
--- a/LUA_GdbModifyVol.cpp
+++ b/LUA_GdbModifyVol.cpp
@@ -378,7 +378,7 @@ LuaCutVolZmapPlane( lua_State* L)
    int nRefType = RTY_DEFAULT ;
    LuaGetParam( L, 4, nRefType) ;
    LuaClearStack( L) ;
-  // taglio la superficie con ilpiano
+  // taglio la superficie con il piano
    bool bOk = ExeCutVolZmapPlane( nId, ptOn, vtN, nRefType) ;
   // restituisco il risultato
    LuaSetParam( L, bOk) ;
@@ -415,6 +415,24 @@ LuaUniformVolZmap( lua_State* L)
    return 1 ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+LuaVolZmapOffset( lua_State* L)
+{
+  // 3 parametri : Id, dDist, nType
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   double dDist ;
+   LuaCheckParam( L, 2, dDist)
+   int nType = VolZmapOffset::FILLET ;
+   LuaGetParam( L, 3, nType) ;
+   LuaClearStack( L) ;
+  // eseguo l'offset della regione
+   bool bOk = ExeVolZMapOffset( nId, dDist, nType) ;
+   LuaSetParam( L, bOk) ;
+   return 1 ;
+}
+
 //-------------------------------------------------------------------------------
 bool
 LuaInstallGdbModifyVol( LuaMgr& luaMgr)
@@ -437,5 +455,6 @@ LuaInstallGdbModifyVol( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtCutVolZmapPlane", LuaCutVolZmapPlane) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtUpdateVolZmapByAddingSurfTm", LuaUpdateVolZmapByAddingSurfTm ) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtUniformZmap", LuaUniformVolZmap) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapOffset", LuaVolZmapOffset) ;
    return bOk ;
 }
\ No newline at end of file