diff --git a/EXE_GdbCreateSurf.cpp b/EXE_GdbCreateSurf.cpp
index aa91bc6..478d1a6 100644
--- a/EXE_GdbCreateSurf.cpp
+++ b/EXE_GdbCreateSurf.cpp
@@ -239,7 +239,7 @@ ExeCreateSurfFlatRegion( int nParentId, INTVECTOR& vCrvIds, int* pnCount)
   // se richiesto, salvo il comando Lua equivalente
    if ( IsCmdLog()) {
       string sLua = "EgtSurfFlatRegion(" + IdToString( nParentId) + ",{" +
-                                           IdListToString( vCrvIds) + "}," +
+                                           IdListToString( vCrvIds) + "})" +
                     " -- Id=" + ToString( nFirstId) + ",Nbr=" + ToString( nCount) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
    }
diff --git a/EXE_GdbModifySurf.cpp b/EXE_GdbModifySurf.cpp
index c50c9b9..9ea5d52 100644
--- a/EXE_GdbModifySurf.cpp
+++ b/EXE_GdbModifySurf.cpp
@@ -232,6 +232,9 @@ ExeSurfFrSubtract( int nId1, int nId2)
    }
   // eseguo la sottrazione della seconda superficie dalla prima
    bOk = bOk && pSfr1->Subtract( *pSfr2L) ;
+  // se il risultato è vuoto, cancello la FlatRegion
+   if ( bOk  && ! pSfr1->IsValid())
+      pGeomDB->Erase( nId1) ;
    ExeSetModified() ;
   // se richiesto, salvo il comando Lua equivalente
    if ( IsCmdLog()) {
@@ -272,6 +275,9 @@ ExeSurfFrIntersect( int nId1, int nId2)
    }
   // eseguo l'intersezione tra le due superfici
    bOk = bOk && pSfr1->Intersect( *pSfr2L) ;
+  // se il risultato è vuoto, cancello la FlatRegion
+   if ( bOk  && ! pSfr1->IsValid())
+      pGeomDB->Erase( nId1) ;
    ExeSetModified() ;
   // se richiesto, salvo il comando Lua equivalente
    if ( IsCmdLog()) {
@@ -283,6 +289,32 @@ ExeSurfFrIntersect( int nId1, int nId2)
    return bOk ;
 }
 
+//----------------------------------------------------------------------------
+bool
+ExeSurfFrOffset( int nId, double dDist, int nType)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
+  // recupero la superficie FlatRegion
+   ISurfFlatRegion* pSfr = GetSurfFlatRegion( pGeomDB->GetGeoObj( nId)) ;
+   bool bOk = ( pSfr != nullptr) ;
+  // eseguo l'offset
+   bOk = bOk && pSfr->Offset( dDist, nType) ;
+  // se il risultato è vuoto, cancello la FlatRegion
+   if ( bOk  && ! pSfr->IsValid())
+      pGeomDB->Erase( nId) ;
+   ExeSetModified() ;
+  // se richiesto, salvo il comando Lua equivalente
+   if ( IsCmdLog()) {
+      string sLua = "EgtSurfFrOffset(" + ToString( nId) + "," +
+                                         ToString( dDist) + "," +
+                                         ToString( nType) + ")" +
+                    " -- Ok=" + ToString( bOk) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
+   return bOk ;
+}
+
 //----------------------------------------------------------------------------
 int
 ExeExtractSurfFrChunkLoops( int nId, int nChunk, int nDestGrpId, int* pnCount)
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 797247e..02b2b02 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbModifySurf.cpp b/LUA_GdbModifySurf.cpp
index 76f7623..e6b0571 100644
--- a/LUA_GdbModifySurf.cpp
+++ b/LUA_GdbModifySurf.cpp
@@ -16,6 +16,7 @@
 #include "LUA.h"
 #include "/EgtDev/Include/EXeExecutor.h"
 #include "/EgtDev/Include/EXeConst.h"
+#include "/EgtDev/Include/EGkCurve.h"
 #include "/EgtDev/Include/EGkGdbConst.h"
 #include "/EgtDev/Include/EGkLuaAux.h"
 
@@ -104,6 +105,24 @@ LuaSurfFrIntersect( lua_State* L)
    return 1 ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+LuaSurfFrOffset( lua_State* L)
+{
+  // 3 parametri : Id, dDist, nType
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   double dDist ;
+   LuaCheckParam( L, 2, dDist)
+   int nType = ICurve::OFF_FILLET ;
+   LuaGetParam( L, 3, nType) ;
+   LuaClearStack( L) ;
+  // eseguo l'offset della regione
+   bool bOk = ExeSurfFrOffset( nId, dDist, nType) ;
+   LuaSetParam( L, bOk) ;
+   return 1 ;
+}
+
 //----------------------------------------------------------------------------
 static int
 LuaExtractSurfFrChunkLoops( lua_State* L)
@@ -162,6 +181,7 @@ LuaInstallGdbModifySurf( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfFrAdd", LuaSurfFrAdd) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfFrSubtract", LuaSurfFrSubtract) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfFrIntersect", LuaSurfFrIntersect) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtSurfFrOffset", LuaSurfFrOffset) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtExtractSurfFrChunkLoops", LuaExtractSurfFrChunkLoops) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtExtractSurfTmFacetLoops", LuaExtractSurfTmFacetLoops) ;
    return bOk ;