diff --git a/EGkCurveAux.h b/EGkCurveAux.h
index 91b6506..2f21d6e 100644
--- a/EGkCurveAux.h
+++ b/EGkCurveAux.h
@@ -48,23 +48,35 @@ struct CNurbsData
 
 //----------------------------------------------------------------------------
 //! Trasforma una linea in una nuova curva di Bezier semplice
-EGK_EXPORT ICurve* CurveToBezierCurve( const ICurve* pCrv, bool bDeg3OrDeg2 = true, bool bForceRat = true) ;
+EGK_EXPORT ICurve* CurveToBezierCurve( const ICurve* pCrv, int nDeg = 3, bool bMakeRatOrNot = true) ;
 
 //----------------------------------------------------------------------------
 //! Trasforma una linea in una nuova curva di Bezier semplice
-EGK_EXPORT ICurveBezier* LineToBezierCurve( const ICurveLine* pLine, bool bDeg3OrDeg2 = true, bool bForceRat = true) ;
+EGK_EXPORT ICurveBezier* LineToBezierCurve( const ICurveLine* pLine, int nDeg = 3, bool bMakeRatOrNot = true) ;
 
 //----------------------------------------------------------------------------
 //! Trasforma un arco in una nuova curva di Bezier semplice o composta
-EGK_EXPORT ICurve* ArcToBezierCurve( const ICurve* pArc, bool bDeg3OrDeg2 = true) ;
+EGK_EXPORT ICurve* ArcToBezierCurve( const ICurve* pArc, int nDeg = 3, bool bMakeRatOrNot = true) ;
 
 //----------------------------------------------------------------------------
 //! Trasforma una curva compo in una nuova curva di Bezier semplice o composta
-EGK_EXPORT ICurve* CompositeToBezierCurve( const ICurveComposite* pCrvCompo, bool bDeg3OrDeg2 = true, bool bForceRat = true) ;
+EGK_EXPORT ICurve* CompositeToBezierCurve( const ICurveComposite* pCrvCompo, int nDeg = 3, bool bMakeRatOrNot = true) ;
 
 //----------------------------------------------------------------------------
-//! Trasforma una curva bezier in una nuova curva di Bezier semplice o composta di grado 3 e razionale
-EGK_EXPORT ICurve* BezierToBasicBezierCurve( const ICurveBezier* pCrvBezier, bool bDeg3OrDeg2 = true, bool bForceRat = true) ;
+//! Trasforma una curva bezier in una nuova curva di Bezier semplice o composta della razionalità e  grado desiderato ( minimo 3)
+EGK_EXPORT ICurve* EditBezierCurve( const ICurveBezier* pCrvBezier, int nDeg = 3, bool bMakeRatOrNot = true, double dTol = 10 * EPS_SMALL) ;
+
+//----------------------------------------------------------------------------
+//! Approssima una bezier con una serie di bezier cubiche
+EGK_EXPORT ICurve* ApproxBezierWithCubics( const ICurveBezier* pCrvBezier, double dTol) ;
+
+//----------------------------------------------------------------------------
+//! Approssima una bezier con una serie di bezier cubiche
+EGK_EXPORT ICurveBezier* ApproxArcCurveBezierWithSingleCubic( const ICurveBezier* pCrvBezier, const Point3d& ptCen) ;
+
+//----------------------------------------------------------------------------
+//! Campiona una serie di punti dalla curva e li interpola con una o più curve di bezier
+EGK_EXPORT ICurve* ApproxCurveWithBezier( const ICurve*, double dTol) ;
 
 //----------------------------------------------------------------------------
 //! Aumento il grado della curva di Bezier
@@ -74,6 +86,10 @@ EGK_EXPORT ICurveBezier* BezierIncreaseDegree( const ICurveBezier* pCrvBezier) ;
 //! Riduco il grado della curva di Bezier
 EGK_EXPORT ICurveBezier* BezierDecreaseDegree( const ICurveBezier* pCrvBezier, double dTol) ;
 
+//----------------------------------------------------------------------------
+//! Misura l'errore di approsimazione tra la curva originale e quella modificata
+EGK_EXPORT bool CalcBezierApproxError( const ICurveBezier* pCrvOri, const ICurveBezier* pCrvNew, double& dErr, int nPoints = 20) ;
+
 //----------------------------------------------------------------------------
 //! Trasforma una curva in una nuova curva semplice o composta senza archi (solo linee o curve di Bezier)
 EGK_EXPORT ICurve* CurveToNoArcsCurve( const ICurve* pCrv) ;
diff --git a/EGkCurveBezier.h b/EGkCurveBezier.h
index 9eb91ee..954bc0c 100644
--- a/EGkCurveBezier.h
+++ b/EGkCurveBezier.h
@@ -39,6 +39,8 @@ class __declspec( novtable) ICurveBezier : public ICurve
       virtual bool GetControlPolygonLength( double& dLen) const = 0 ;
       virtual int  GetSingularParam( double& dPar) const = 0 ;
       virtual bool MakeRational( void) = 0 ;
+      virtual bool MakeRationalStandardForm( void) = 0 ;
+      virtual bool MakeNonRational( double dTol) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EGkSfrCreate.h b/EGkSfrCreate.h
index 6c2ae75..fea6cd4 100644
--- a/EGkSfrCreate.h
+++ b/EGkSfrCreate.h
@@ -35,7 +35,7 @@ EGK_EXPORT ISurfFlatRegion* GetSurfFlatRegionFromFatCurve( ICurve* pCrv, double
 EGK_EXPORT ISurfFlatRegion* GetSurfFlatRegionFromTriangle( const Triangle3d& Tria) ;
 EGK_EXPORT ISurfFlatRegion* GetSurfFlatRegionFromPolyLine( const PolyLine& ContourPolyLine) ;
 EGK_EXPORT ISurfFlatRegion* GetSurfFlatRegionFromPolyLineVector( const POLYLINEVECTOR& vContoursPolyLineVec) ;
-EGK_EXPORT bool CalcRegionPolyLines( const CICURVEPVECTOR& vpCurve, double dLinTol, POLYLINEVECTOR& vPL, Vector3d& vtN) ;
+EGK_EXPORT bool CalcRegionPolyLines( const POLYLINEVECTOR& vPL, POLYLINEVECTOR& vPLOrd, Vector3d& vtN, INTMATRIX& vnPLIndMat) ;
 
 
 //----------------------------------------------------------------------------
diff --git a/EGkSurfTriMesh.h b/EGkSurfTriMesh.h
index e1491f8..8a9da18 100644
--- a/EGkSurfTriMesh.h
+++ b/EGkSurfTriMesh.h
@@ -50,7 +50,7 @@ class __declspec( novtable) ISurfTriMesh : public ISurf
       virtual bool RemoveTriangle( int nId) = 0 ;
       virtual bool AdjustTopology( void) = 0 ;
       virtual bool CreateByFlatContour( const PolyLine& PL) = 0 ;
-      virtual bool CreateByRegion( const POLYLINEVECTOR& vPL) = 0 ;
+      virtual bool CreateByRegion( const POLYLINEVECTOR& vPL, const INTMATRIX& vnPLIndMat) = 0 ;
       virtual bool CreateByExtrusion( const PolyLine& PL, const Vector3d& vtExtr) = 0 ;
       virtual bool CreateByPointCurve( const Point3d& ptP, const PolyLine& PL) = 0 ;
       virtual bool CreateByTwoCurves( const PolyLine& PL1, const PolyLine& PL2, int nRuledType) = 0 ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 207189c..2b806a3 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -323,7 +323,7 @@ EXE_EXPORT int  ExeCreatePolygonFromSide( int nParentId, int nNumSides, const Po
                                           const Point3d& ptFin, int nRefType) ;
 EXE_EXPORT int  ExeCreateCirclesAlongCurve( int nParentId, int nCrvId, double dOffset, double dOverlap,
                                             double dStartAdd, double dEndAdd, double dDiam, int* pnCount) ;
-EXE_EXPORT int  ExeCreateCurveBezierForm( int nParentId, int nCrvId) ;
+EXE_EXPORT int  ExeCreateCurveBezierForm( int nParentId, int nCrvId, int nDeg) ;
 
 // GeomDB Create Surf
 EXE_EXPORT int  ExeCreateSurfFlatRegion( int nParentId, const INTVECTOR& vCrvIds, int* pnCount) ;
@@ -633,8 +633,10 @@ EXE_EXPORT bool ExeProjectCurveOnSurfBzExt( int nCurveId, int nSurfBzId, int nGu
 EXE_EXPORT int  ExeCurveGetVoronoi( int nId, int nDestGrpId, int nBound, int* pnCount) ;
 EXE_EXPORT int  ExeCurveGetMedialAxis( int nId, int nDestGrpId, int nSide, int* pnCount) ;
 EXE_EXPORT int  ExeCurveGetFatCurve( int nId, int nDestGrpId, double dRad, bool bSquareEnds, bool bSquareMids, int* pnCount) ;
-EXE_EXPORT bool  ExeCurveBezierIncreaseDegree( int nCrvId) ;
-EXE_EXPORT bool  ExeCurveBezierDecreaseDegree( int nCrvId, double dTol = 100) ;
+EXE_EXPORT bool ExeCurveBezierIncreaseDegree( int nCrvId) ;
+EXE_EXPORT bool ExeCurveBezierDecreaseDegree( int nCrvId, double dTol = 100) ;
+EXE_EXPORT bool ExeCurveBezierApproxToNonRat( int nCrvId, double dTol = 10 * EPS_SMALL) ;
+EXE_EXPORT bool ExeCurveBezierApproxWithCubicBeziers( int nCrvId, double dTol = 10 * EPS_SMALL) ;
 
 // GeomDb Surf Modify
 EXE_EXPORT bool ExeInvertSurface( const INTVECTOR& vIds) ;