diff --git a/CurveAux.cpp b/CurveAux.cpp
index a9e861c..4f32309 100644
--- a/CurveAux.cpp
+++ b/CurveAux.cpp
@@ -403,6 +403,40 @@ CopyThickness( const ICurve* pSouCrv, ICurve* pDestCrv)
    return true ;
 }
 
+//----------------------------------------------------------------------------
+ICurve*
+CurveToBezierCurve( const ICurve* pCrv)
+{
+   PtrOwner<ICurve> pBezierForm ;
+   switch ( pCrv->GetType()) {
+   case CRV_LINE :{
+      const ICurveLine* pCrvLine = static_cast<const ICurveLine*>( pCrv) ;
+      pBezierForm.Set( LineToBezierCurve( pCrvLine)) ;
+      break ;
+   }
+   case CRV_ARC : {
+      const ICurveArc* pCrvArc = static_cast<const ICurveArc*>( pCrv) ;
+      pBezierForm.Set( ArcToBezierCurve( pCrvArc)) ;
+      break ;
+   }
+   case CRV_COMPO : {
+      const ICurveComposite* pCrvCompo = static_cast<const ICurveComposite*>( pCrv) ;
+      pBezierForm.Set( CompositeToBezierCurve( pCrvCompo)) ;
+      break ;
+   }
+   case CRV_BEZIER : {
+      const ICurveBezier* pCrvBezier = static_cast<const ICurveBezier*>( pCrv) ;
+      pBezierForm.Set( BezierToBasicBezierCurve( pCrvBezier)) ;
+      break ;
+   }
+   default :
+      return nullptr ;
+      break ;
+   }
+
+   return Release( pBezierForm) ;
+}
+
 //----------------------------------------------------------------------------
 ICurveBezier*
 LineToBezierCurve( const ICurveLine* pCrvLine)
diff --git a/CurveBezier.cpp b/CurveBezier.cpp
index afc6c6d..8fd2aed 100644
--- a/CurveBezier.cpp
+++ b/CurveBezier.cpp
@@ -2208,3 +2208,17 @@ CurveBezier::ResetVoronoiObject() const
       delete m_pVoronoiObj ;
    m_pVoronoiObj = nullptr ;
 }
+
+//----------------------------------------------------------------------------
+bool
+CurveBezier::MakeRational( void)
+{ 
+   if ( m_bRat)
+      return true ;
+   // creo il vettore dei pesi e li setto tutti a 1
+   m_vWeCtrl.assign( m_nDeg + 1, 1) ;
+   // aggiorno il flag rational
+   m_bRat = true ;
+
+   return true ;
+}
diff --git a/CurveBezier.h b/CurveBezier.h
index b402f6c..e51780a 100644
--- a/CurveBezier.h
+++ b/CurveBezier.h
@@ -148,6 +148,7 @@ class CurveBezier : public ICurveBezier, public IGeoObjRW
       double GetControlWeight( int nInd, bool* pbOk = NULL) const override ;
       bool GetControlPolygonLength( double& dLen) const override ;
       int  GetSingularParam( double& dPar) const override ;
+      bool MakeRational( void) override ;
 
    public :                      // IGeoObjRW
       int GetNgeId( void) const override ;