diff --git a/DllExchange.cpp b/DllExchange.cpp
index e4ebf1f..3473f30 100644
--- a/DllExchange.cpp
+++ b/DllExchange.cpp
@@ -40,6 +40,7 @@ static const char* EEX_GETEEXVERSION = "GetEExVersion" ;
 static const char* EEX_SETEEXKEY = "SetEExKey" ;
 static const char* EEX_SETEEXNETHWKEY = "SetEExNetHwKey" ;
 static const char* EEX_SETBTLAUXDIR = "SetBtlAuxDir" ;
+static const char* EEX_SETTHREEJSAUXDIR = "SetThreeJSAuxDir" ;
 static const char* EEX_CREATEBEAMMGR = "CreateBeamMgr" ;
 static const char* EEX_CREATEIMPORTBTL = "CreateImportBtl" ;
 static const char* EEX_CREATEIMPORTBTLX = "CreateImportBtlx" ;
@@ -180,6 +181,22 @@ MySetBtlAuxDir( const string& sBtlAuxDir)
    return pFun( sBtlAuxDir) ;
 }
 
+//-----------------------------------------------------------------------------
+bool
+MySetThreeJSAuxDir( const string& sThreeJSAuxDir )
+{
+  // verifico caricamento libreria EgtExchange
+   if ( s_hEEx == nullptr)
+      return false ;
+  // recupero funzione creazione oggetto
+   typedef bool ( *PF_SetThreeJSAuxDir)( const string& sThreeJSAuxDir) ;
+   PF_SetThreeJSAuxDir pFun = ( PF_SetThreeJSAuxDir) GetProcAddress( s_hEEx, EEX_SETTHREEJSAUXDIR) ;
+   if ( pFun == nullptr)
+      return false ;
+   return pFun( sThreeJSAuxDir) ;
+}
+
+
 //-----------------------------------------------------------------------------
 IBeamMgr*
 MyCreateBeamMgr( void)
diff --git a/DllExchange.h b/DllExchange.h
index aaf27ac..b5231dd 100644
--- a/DllExchange.h
+++ b/DllExchange.h
@@ -41,6 +41,7 @@ void MySetEExKey( const std::string& sKey) ;
 void MySetEExNetHwKey( bool bNetHwKey) ;
 const char* MyGetEExVersion( void) ;
 bool MySetBtlAuxDir( const std::string& sBtlAuxDir) ;
+bool MySetThreeJSAuxDir( const std::string& sThreeJSAuxDir) ;
 IBeamMgr* MyCreateBeamMgr( void) ;
 IImportBtl* MyCreateImportBtl( void) ;
 IImportBtlx* MyCreateImportBtlx( void) ;
diff --git a/EXE_Exchange.cpp b/EXE_Exchange.cpp
index 2a5ff1b..a31a017 100644
--- a/EXE_Exchange.cpp
+++ b/EXE_Exchange.cpp
@@ -119,6 +119,14 @@ ExeSetBtlAuxDir( const string& sBtlAuxDir)
    return MySetBtlAuxDir( sBtlAuxDir) ;
 }
 
+//-----------------------------------------------------------------------------
+bool
+ExeSetThreeJSAuxDir( const string & sThreeJSAuxDir )
+{
+   return MySetThreeJSAuxDir( sThreeJSAuxDir) ;
+}
+
+
 //-----------------------------------------------------------------------------
 bool
 ExeImportBtl( const string& sFilePath, int nFlag)
@@ -571,16 +579,17 @@ ExeExportThreeJS( int nId, const string& sFilePath, int nFilter)
   // preparo l'esportatore
    PtrOwner<IExportThreeJS> pExpThreeJS( MyCreateExportThreeJS()) ;
    bOk = bOk && ! IsNull( pExpThreeJS) ;
-   // eseguo l'esportazione
-   pExpThreeJS->SetOptions( nFilter) ;
+
+  // eseguo l'esportazione
+   bOk = bOk && pExpThreeJS->SetOptions( nFilter) ;
    bOk = bOk && pExpThreeJS->Export( pGeomDB, nId, sFilePath, pScene, ExeUiUnitsAreMM()) ;
-   // se richiesto, salvo il comando Lua equivalente
+  // se richiesto, salvo il comando Lua equivalente
    if ( IsCmdLog()) {
       string sLua = "EgtExportThreeJS(" + ToString( nId) + ",'" +
          StringToLuaString( sFilePath) + "')" +
          " -- Ok=" + ToString( bOk) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
    }
-   // restituisco il risultato
+  // restituisco il risultato
    return bOk ;
 }
diff --git a/LUA_Exchange.cpp b/LUA_Exchange.cpp
index 831ac2b..6099081 100644
--- a/LUA_Exchange.cpp
+++ b/LUA_Exchange.cpp
@@ -249,7 +249,7 @@ LuaExportThreeJS( lua_State* L)
    string sFilePath ;
    LuaCheckParam( L, 2, sFilePath)
    int nFilter = EEXFLT_DEFAULT;
-   LuaGetParam(L, 3, nFilter);
+   LuaGetParam( L, 3, nFilter);
    LuaClearStack( L) ;
    // creo il file
    bool bOk = ExeExportThreeJS( nGroupId, sFilePath, nFilter) ;