diff --git a/EGkSbzFromCurves.h b/EGkSbzFromCurves.h
index e3bb415..a688a21 100644
--- a/EGkSbzFromCurves.h
+++ b/EGkSbzFromCurves.h
@@ -46,5 +46,5 @@ EGK_EXPORT ISurfBezier* GetSurfBezierByScrewing( const ICurve* pCurve, const Poi
 //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* 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) ;
diff --git a/EGkSurfBezier.h b/EGkSurfBezier.h
index aecaeaf..2b2089a 100644
--- a/EGkSurfBezier.h
+++ b/EGkSurfBezier.h
@@ -28,6 +28,11 @@ class __declspec( novtable) ISurfBezier : public ISurf
    public :
       enum Side { FROM_MINUS = -1,     // da valori inferiori del parametro
                   FROM_PLUS  = 1} ;    // da valori superiori del parametro
+public :
+   enum RuledType { RLT_B_ISOPAR = 0,            // con parametrizzazione simile tra le due curve
+                    RLT_B_MINDIST = 1,           // con distanza minima tra le due curve, usando start e end delle curve presenti
+                    RLT_B_ISOPAR_SMOOTH = 2,     // con parametrizzazione simile tra le due curve, tento di smussare un po' la curva nel mezzo ( forse questa modalità non serve se riesco a sistemare la triangolazione per le superfici bilineari)
+                    RLT_B_MINDIST_PLUS = 2} ;    // con distanza minima tra le due curve, aggiungendo punti lungo le curve dove necessario
    public :                      // IGeoObj
       ISurfBezier* Clone( void) const override = 0 ;
    public :
@@ -77,6 +82,8 @@ class __declspec( novtable) ISurfBezier : public ISurf
       virtual bool CreateByRegion( const POLYLINEVECTOR& vPL) = 0 ;
       virtual bool CreateByExtrusion( const ICurve* pCrv, const Vector3d& vtExtr, bool bDeg3OrDeg2 = false) = 0 ;
       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 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 3ac17a3..13d4dc7 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -384,6 +384,7 @@ EXE_EXPORT int  ExeCreateSurfBzByScrewing( int nParentId, int nCrvId,
 EXE_EXPORT int  ExeCreateSurfBzByRevolve( int nParentId, int nCrvId,
                                            const Point3d& ptAx, const Vector3d& vtAx,
                                            bool bCapEnds, double dLinTol, int nRefType) ;
+EXE_EXPORT int  ExeCreateSurfBzRuled( int nParentId, int nCrvId1, int nCrvId2, int nRuledType, double dLinTol) ;
 
 // GeomDB Create Volume
 EXE_EXPORT int  ExeCreateVolZmap( int nParentId, const Point3d& ptIni, double dDimX,