diff --git a/EXE_GdbModifyCurve.cpp b/EXE_GdbModifyCurve.cpp
index c3631bd..ad1e72c 100644
--- a/EXE_GdbModifyCurve.cpp
+++ b/EXE_GdbModifyCurve.cpp
@@ -2865,3 +2865,84 @@ ExeCurveGetFatCurve( int nId, int nDestGrpId, double dRad, bool bSquareEnds, boo
       *pnCount = nCount ;
    return nFirstId ;
 }
+
+//----------------------------------------------------------------------------
+bool
+ExeCurveBezierIncreaseDegree( int nCrvId) 
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
+   // recupero la curva
+   const ICurve* pCrv = GetCurve( pGeomDB->GetGeoObj( nCrvId)) ;
+   if ( pCrv == nullptr)
+      return GDB_ID_NULL ;
+   //// recupero il riferimento della curva
+   //Frame3d frCrv ;
+   //if ( ! pGeomDB->GetGlobFrame( nCrvId, frCrv))
+   //   return GDB_ID_NULL ;
+
+   if( pCrv->GetType() != CRV_BEZIER)
+      return false ;
+
+   // aumento il grado della curva
+   bool bOk = true ;
+   PtrOwner<ICurveBezier> pCrvBezierNew ( BezierIncreaseDegree( GetCurveBezier( pCrv))) ;
+   Vector3d vtExtr ;
+   if ( bOk && pCrv->GetExtrusion( vtExtr))
+      pCrvBezierNew->SetExtrusion( vtExtr) ;
+   double dThick = 0 ;
+   if ( bOk  &&  pCrv->GetThickness( dThick))
+      pCrvBezierNew->SetThickness(dThick) ;
+   // sostituisco la vecchia curva con la nuova
+   bOk = bOk && pGeomDB->ReplaceGeoObj( nCrvId, Release( pCrvBezierNew)) ;
+   ExeSetModified() ;
+
+   if ( IsCmdLog()) {
+      string sLua = "EgtCurveBezierIncreaseDegree(" + ToString( nCrvId) + ")"
+                     " -- Ok=" + ToString( bOk) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
+
+   return bOk ;
+}
+
+//----------------------------------------------------------------------------
+bool
+ExeCurveBezierDecreaseDegree( int nCrvId, double dTol) 
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
+   // recupero la curva
+   const ICurve* pCrv = GetCurve( pGeomDB->GetGeoObj( nCrvId)) ;
+   if ( pCrv == nullptr)
+      return GDB_ID_NULL ;
+   //// recupero il riferimento della curva
+   //Frame3d frCrv ;
+   //if ( ! pGeomDB->GetGlobFrame( nCrvId, frCrv))
+   //   return GDB_ID_NULL ;
+
+   if( pCrv->GetType() != CRV_BEZIER)
+      return false ;
+
+   // riduco il grado della curva
+   bool bOk = true ;
+   PtrOwner<ICurveBezier> pCrvBezierNew ( BezierDecreaseDegree( GetCurveBezier( pCrv), dTol)) ;
+   bOk = bOk  &&  ! IsNull( pCrvBezierNew)  &&  pCrvBezierNew->IsValid() ;
+   Vector3d vtExtr ;
+   if ( bOk && pCrv->GetExtrusion( vtExtr))
+      pCrvBezierNew->SetExtrusion( vtExtr) ;
+   double dThick = 0 ;
+   if ( bOk  &&  pCrv->GetThickness( dThick))
+      pCrvBezierNew->SetThickness(dThick) ;
+   // sostituisco la vecchia curva con la nuova
+   bOk = bOk && pGeomDB->ReplaceGeoObj( nCrvId, Release( pCrvBezierNew)) ;
+   ExeSetModified() ;
+
+   if ( IsCmdLog()) {
+      string sLua = "EgtCurveBezierDecreaseDegree(" + ToString( nCrvId) + ")"
+                    " -- Ok=" + ToString( bOk) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
+
+   return bOk ;
+}
\ No newline at end of file
diff --git a/LUA_GdbModifyCurve.cpp b/LUA_GdbModifyCurve.cpp
index 28f00ff..c4d9cc5 100644
--- a/LUA_GdbModifyCurve.cpp
+++ b/LUA_GdbModifyCurve.cpp
@@ -1129,6 +1129,38 @@ LuaCurveGetFatCurve( lua_State* L)
    return 2 ;
 }
 
+//----------------------------------------------------------------------------
+static int
+LuaCurveBezierIncreaseDegree( lua_State* L)
+{
+   // 1 parametro : CrvId
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   LuaClearStack( L) ;
+   // eseguo
+   int nCount = 0 ;
+   bool bOk = ExeCurveBezierIncreaseDegree( nId) ;
+   LuaSetParam( L, bOk) ;
+
+   return 1 ;
+}
+
+//----------------------------------------------------------------------------
+static int
+LuaCurveBezierDecreaseDegree( lua_State* L)
+{
+   // 1 parametro : CrvId
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   LuaClearStack( L) ;
+   // eseguo
+   int nCount = 0 ;
+   bool bOk = ExeCurveBezierDecreaseDegree( nId) ;
+   LuaSetParam( L, bOk) ;
+
+   return 1 ;
+}
+
 //-------------------------------------------------------------------------------
 bool
 LuaInstallGdbModifyCurve( LuaMgr& luaMgr)
@@ -1191,5 +1223,7 @@ LuaInstallGdbModifyCurve( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveGetFatCurve", LuaCurveGetFatCurve) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtProjectCurveOnSurfBz", LuaProjectCurveOnSurfBz) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtProjectCurveOnSurfBzExt", LuaProjectCurveOnSurfBzExt) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtCurveBezierIncreaseDeg", LuaCurveBezierIncreaseDegree) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtCurveBezierDecreaseDeg", LuaCurveBezierDecreaseDegree) ;
    return bOk ;
 }