diff --git a/EGkCurveAux.h b/EGkCurveAux.h
index 0c625dc..2807457 100644
--- a/EGkCurveAux.h
+++ b/EGkCurveAux.h
@@ -75,9 +75,13 @@ EGK_EXPORT ICurve* ApproxBezierWithCubics( const ICurveBezier* pCrvBezier, doubl
 EGK_EXPORT ICurveBezier* ApproxArcCurveBezierWithSingleCubic( const ICurveBezier* pCrvBezier, const Point3d& ptCen) ;
 
 //----------------------------------------------------------------------------
-//! Campiona una serie di punti dalla curva e li interpola con una o pił curve di bezier
+//! Campiona una serie di punti dalla curva e li approssima con una o pił curve di bezier
 EGK_EXPORT ICurve* ApproxCurveWithBezier( const ICurve*, double dTol) ;
 
+//----------------------------------------------------------------------------
+//! Interpola un set di punti e li approssima con una o pił curve di bezier cubiche
+EGK_EXPORT ICurve* InterpolatePointSetWithBezier( const PNTVECTOR& vPnt, double dTol) ;
+
 //----------------------------------------------------------------------------
 //! Aumento il grado della curva di Bezier
 EGK_EXPORT ICurveBezier* BezierIncreaseDegree( const ICurveBezier* pCrvBezier) ;
diff --git a/EGkCurveBezier.h b/EGkCurveBezier.h
index 954bc0c..b3a96a3 100644
--- a/EGkCurveBezier.h
+++ b/EGkCurveBezier.h
@@ -41,6 +41,7 @@ class __declspec( novtable) ICurveBezier : public ICurve
       virtual bool MakeRational( void) = 0 ;
       virtual bool MakeRationalStandardForm( void) = 0 ;
       virtual bool MakeNonRational( double dTol) = 0 ;
+      virtual bool IsALine( void) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EGkSbzFromCurves.h b/EGkSbzFromCurves.h
index 6ca56da..f90fdc0 100644
--- a/EGkSbzFromCurves.h
+++ b/EGkSbzFromCurves.h
@@ -41,11 +41,9 @@ EGK_EXPORT ISurfBezier* GetSurfBezierByScrewing( const ICurve* pCurve, const Poi
                                                    double dAngRotDeg, double dMove, bool bCapEnds, double dLinTol = 10 * EPS_SMALL) ;
 //EGK_EXPORT ISurfBezier* GetSurfBezierRectSwept( double dDimH, double dDimV, double dBevelH, double dBevelV,
 //                                                   const ICurve* pGuide, int nCapType, double dLinTol = 10 * EPS_SMALL) ;
-//EGK_EXPORT ISurfBezier* GetSurfBezierSwept( const ICurve* pSect, const ICurve* pGuide, const Vector3d& vtAx,
-//                                                   bool bCapEnds, double dLinTol = 10 * EPS_SMALL) ;
-//EGK_EXPORT ISurfBezier* GetSurfBezierSwept( const ISurfFlatRegion* pSfrSect, const ICurve* pGuide, const Vector3d& vtAx,
-//                                                   bool bCapEnds, double dLinTol = 10 * EPS_SMALL) ;
 //EGK_EXPORT ISurfBezier* GetSurfBezierTransSwept( const ICurve* pSect, const ICurve* pGuide, bool bCapEnds, double dLinTol = 10 * EPS_SMALL) ;
 EGK_EXPORT ISurfBezier* GetSurfBezierRuled( const Point3d& ptP, const ICurve* pCurve, double dLinTol = 10 * EPS_SMALL) ;
 EGK_EXPORT ISurfBezier* GetSurfBezierRuled( const ICurve* pCurve1, const ICurve* pCurve2, int nType, double dLinTol = 10 * EPS_SMALL) ;
 EGK_EXPORT ISurfBezier* GetSurfBezierSkinned( const CICURVEPVECTOR& vCrv, double dLinTol = 10 * EPS_SMALL) ;
+EGK_EXPORT ISurfBezier* GetSurfBezierSweptInPlane( const ICurve* pSect, const ICurve* pGuide, const Vector3d& vtNorm, bool bCapEnds, double dLinTol = 10 * EPS_SMALL) ;
+EGK_EXPORT ISurfBezier* GetSurfBezierSwept3d( const ICurve* pSect, const ICurve* pGuide, const Vector3d& vtNorm, bool bCapEnds, double dLinTol = 10 * EPS_SMALL) ;
diff --git a/EGkSurfBezier.h b/EGkSurfBezier.h
index 08e6fd2..a5f8831 100644
--- a/EGkSurfBezier.h
+++ b/EGkSurfBezier.h
@@ -88,6 +88,7 @@ public :                      // IGeoObj
       virtual bool CreateByScrewing( const ICurve* pCurve, const Point3d& ptAx, const Vector3d& vtAx, double dAngRotDeg, double dMove) = 0 ;
       virtual bool CreateByPointCurve( const Point3d& pt, const ICurve* pCurve) = 0 ;
       virtual bool CreateByTwoCurves( const ICurve* pCurve1, const ICurve* pCurve2, int nType) = 0 ;
+      virtual bool CreateBySetOfCurves( const ICURVEPOVECTOR& vCrvBez, bool bReduceToDeg3 = true) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 18cc977..587bf91 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -389,6 +389,8 @@ EXE_EXPORT int  ExeCreateSurfBzByRevolve( int nParentId, int nCrvId,
 EXE_EXPORT int  ExeCreateSurfBzByPointCurve( int nParentId, int nCrvId, const Point3d& ptAx, bool bCapEnds, double dLinTol, int nRefType) ;
 EXE_EXPORT int  ExeCreateSurfBzRuled( int nParentId, int nCrvId1, int nCrvId2, int nRuledType, bool bCapEnds, double dLinTol) ;
 EXE_EXPORT int  ExeCreateSurfBzSkinned( int nParentId, const INTVECTOR& nCrvId1, bool bCapEnds, double dLinTol) ;
+EXE_EXPORT int  ExeCreateSurfBzSwept( int nParentId, int nSectId, int nGuideId, const Vector3d& vtAx,
+                                      bool bCapEnds, double dLinTol, int nRefType) ;
 
 // GeomDB Create Volume
 EXE_EXPORT int  ExeCreateVolZmap( int nParentId, const Point3d& ptIni, double dDimX,