diff --git a/EGkCurveBezier.h b/EGkCurveBezier.h
index 8231cba..f39bc44 100644
--- a/EGkCurveBezier.h
+++ b/EGkCurveBezier.h
@@ -39,16 +39,16 @@ class __declspec( novtable) ICurveBezier : public ICurve
 
 //-----------------------------------------------------------------------------
 inline ICurveBezier* CreateCurveBezier( void)
-               { return (static_cast<ICurveBezier*>( CreateGeoObj( CRV_BEZ))) ; }
+               { return (static_cast<ICurveBezier*>( CreateGeoObj( CRV_BEZIER))) ; }
 inline ICurveBezier* CloneCurveBezier( const IGeoObj* pGObj)
-               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_BEZ)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_BEZIER)
                     return nullptr ;
                  return (static_cast<ICurveBezier*>(pGObj->Clone())) ; }
 inline const ICurveBezier* GetCurveBezier( const IGeoObj* pGObj)
-               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_BEZ)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_BEZIER)
                     return nullptr ;
                  return (static_cast<const ICurveBezier*>(pGObj)) ; }
 inline ICurveBezier* GetCurveBezier( IGeoObj* pGObj)
-               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_BEZ)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_BEZIER)
                     return nullptr ;
                  return (static_cast<ICurveBezier*>(pGObj)) ; }
diff --git a/EGkGeoObjType.h b/EGkGeoObjType.h
index dcc29db..124b489 100644
--- a/EGkGeoObjType.h
+++ b/EGkGeoObjType.h
@@ -31,10 +31,11 @@ enum GeoObjType { GEO_NONE =      0,
                   GEO_FRAME3D =   ( GEO_ZERODIM + 2),
                   CRV_LINE =      ( GEO_CURVE + 0),
                   CRV_ARC =       ( GEO_CURVE + 1),
-                  CRV_BEZ =       ( GEO_CURVE + 2),
+                  CRV_BEZIER =    ( GEO_CURVE + 2),
                   CRV_COMPO =     ( GEO_CURVE + 3),
                   SRF_TRIMESH =   ( GEO_SURF + 0),
                   SRF_FLATRGN =   ( GEO_SURF + 1),
+                  SRF_BEZIER =    ( GEO_SURF + 2),
                   VOL_ZMAP =      ( GEO_VOLUME + 0),
                   EXT_TEXT =      ( GEO_EXTRA + 0),
                   EXT_DIMENSION = ( GEO_EXTRA + 1)} ;
diff --git a/EGkSurfBezier.h b/EGkSurfBezier.h
new file mode 100644
index 0000000..6681723
--- /dev/null
+++ b/EGkSurfBezier.h
@@ -0,0 +1,74 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2020-2020
+//----------------------------------------------------------------------------
+// File : EGkSurfBezier.h      Data : 22.03.20          Versione : 2.2c3
+// Contenuto : Dichiarazione della interfaccia ISurfBezier.
+//
+//
+//
+// Modifiche : 22.03.20 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkSurf.h"
+#include "/EgtDev/Include/EgtPointerOwner.h"
+
+class PolyLine ;
+class ISurfTriMesh ;
+
+//----------------------------------------------------------------------------
+class __declspec( novtable) ISurfBezier : public ISurf
+{
+   public :                      // IGeoObj
+      ISurfBezier* Clone( void) const override = 0 ;
+   public :
+      virtual bool CopyFrom( const IGeoObj* pGObjSrc) = 0 ;
+      virtual bool Init( int nDegU, int nDegV, bool bIsRational) = 0 ;
+      virtual bool SetControlPoint( int nIndU, int nIndV, const Point3d& ptCtrl) = 0 ;
+      virtual bool SetControlPoint( int nInd, const Point3d& ptCtrl) = 0 ;
+      virtual bool SetControlPoint( int nIndU, int nIndV, const Point3d& ptCtrl, double dW) = 0 ;
+      virtual bool SetControlPoint( int nInd, const Point3d& ptCtrl, double dW) = 0 ;
+      virtual bool GetInfo( int& nDegU, int& nDegV, bool& bIsRat) const = 0 ;
+      virtual const Point3d& GetControlPoint( int nIndU, int nIndV, bool* pbOk) const = 0 ;
+      virtual const Point3d& GetControlPoint( int nInd, bool* pbOk) const = 0 ;
+      virtual double GetControlWeight( int nIndU, int nIndV, bool* pbOk) const = 0 ;
+      virtual double GetControlWeight( int nInd, bool* pbOk) const = 0 ;
+      virtual bool IsAPoint( void) const = 0 ;
+      virtual bool GetPointD1D2( double dU, double dV, Point3d& ptPos,
+                                 Vector3d* pvtDerU = nullptr, Vector3d* pvtDerV = nullptr,
+                                 Vector3d* pvtDerUU = nullptr, Vector3d* pvtDerVV = nullptr, Vector3d* pvtDerUV = nullptr) const = 0 ;
+      virtual bool GetPointNrmD1D2( double dU, double dV, Point3d& ptPos, Vector3d& vtN,
+                                    Vector3d* pvtDerU = nullptr, Vector3d* pvtDerV = nullptr,
+                                    Vector3d* pvtDerUU = nullptr, Vector3d* pvtDerVV = nullptr, Vector3d* pvtDerUV = nullptr) const = 0 ;
+      virtual bool GetControlCurveOnU( int nIndV, PolyLine& plCtrlU) const = 0 ;
+      virtual bool GetControlCurveOnV( int nIndU, PolyLine& plCtrlV) const = 0 ;
+      virtual bool GetCurveOnU( double dV, PolyLine& plCtrlU) const = 0 ;
+      virtual bool GetCurveOnV( double dU, PolyLine& plCtrlV) const = 0 ;
+      virtual const ISurfTriMesh* GetAuxSurf( void) const = 0 ;
+} ;
+
+//-----------------------------------------------------------------------------
+inline ISurfBezier* CreateSurfBezier( void)
+               { return (static_cast<ISurfBezier*>( CreateGeoObj( SRF_BEZIER))) ; }
+inline ISurfBezier* CloneSurfBezier( const IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != SRF_BEZIER)
+                    return nullptr ;
+                 return (static_cast<ISurfBezier*>(pGObj->Clone())) ; }
+inline const ISurfBezier* GetSurfBezier( const IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != SRF_BEZIER)
+                    return nullptr ;
+                 return (static_cast<const ISurfBezier*>(pGObj)) ; }
+inline ISurfBezier* GetSurfBezier( IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != SRF_BEZIER)
+                    return nullptr ;
+                 return (static_cast<ISurfBezier*>(pGObj)) ; }
+
+//----------------------------------------------------------------------------
+// Raccolte di puntatori a ISurfBezier
+typedef std::vector<const ISurfBezier*>    CISURFBEZPVECTOR ;   // vettore di puntatori a const ISurfBezier
+typedef std::vector<ISurfBezier*>          ISURFBEZPVECTOR ;    // vettore di puntatori a ISurfBezier
+typedef std::list<ISurfBezier*>            ISURFBEZPLIST ;      // lista di puntatori a ISurfBezier
+typedef std::vector<PtrOwner<ISurfBezier>> ISURFBEZPOVECTOR ;   // vettore di puntatori esclusivi a ISurfBezier
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 364aaac..4f829c5 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -289,6 +289,8 @@ EXE_EXPORT int  ExeCreateSurfTmRuled( int nParentId, int nPtOrCrvId1, int nPtOrC
 EXE_EXPORT int  ExeCreateSurfTmByTriangles( int nParentId, const INTVECTOR& vIds, bool bErase) ;
 EXE_EXPORT int  ExeCreateSurfTmBySewing( int nParentId, const INTVECTOR& vIds, bool bErase) ;
 EXE_EXPORT int  ExeCreateSurfTmByVolZmap( int nParentId, int nZmapId, int nPart) ;
+EXE_EXPORT int  ExeCreateSurfBezier( int nParentId, int nDegU, int nDegV, const PNTVECTOR& vPnt, int nRefType) ;
+EXE_EXPORT int  ExeCreateSurfBezierRational( int nParentId, int nDegU, int nDegV, const PNTUVECTOR& vPntW, int nRefType) ;
 
 // GeomDB Create Volume
 EXE_EXPORT int  ExeCreateVolZmap( int nParentId, const Point3d& ptIni, double dDimX,
@@ -541,20 +543,14 @@ EXE_EXPORT bool ExeVolZmapGetDepth( int nId, const Point3d& ptP, const Vector3d&
 EXE_EXPORT int  ExeVolZmapGetEdges( int nId, int nDestGrpId, int* pnCount) ;
 EXE_EXPORT bool ExeCutVolZmapPlane( int nId, const Point3d& ptOn, const Vector3d& vtN, int nRefType) ;
 
-// Geo Snap Vector/Point/Frame
-EXE_EXPORT bool ExeStartPoint( int nId, int nRefId, Point3d& ptP) ;
-EXE_EXPORT bool ExeEndPoint( int nId, int nRefId, Point3d& ptP) ;
-EXE_EXPORT bool ExeMidPoint( int nId, int nRefId, Point3d& ptP) ;
-EXE_EXPORT bool ExeCenterPoint( int nId, int nRefId, Point3d& ptP) ;
-EXE_EXPORT bool ExeCentroid( int nId, int nRefId, Point3d& ptP) ;
-EXE_EXPORT bool ExeAtParamPoint( int nId, double dU, int nRefId, Point3d& ptP) ;
-EXE_EXPORT bool ExeNearPoint( int nId, const Point3d& ptNear, int nRefId, Point3d& ptP) ;
-EXE_EXPORT bool ExeIntersectionPoint( int nId1, int nId2, const Point3d& ptNear, int nRefId, Point3d& ptP) ;
-EXE_EXPORT bool ExeStartVector( int nId, int nRefId, Vector3d& vtV) ;
-EXE_EXPORT bool ExeEndVector( int nId, int nRefId, Vector3d& vtV) ;
-EXE_EXPORT bool ExeMidVector( int nId, int nRefId, Vector3d& vtV) ;
-EXE_EXPORT bool ExeAtParamVector( int nId, double dU, int nSide, int nRefId, Vector3d& vtV) ;
-EXE_EXPORT bool ExeFrame( int nId, int nRefId, Frame3d& frFrame) ;
+// GeomDB Get
+EXE_EXPORT bool ExeTextNormVersor( int nId, int nRefId, Vector3d& vtNorm) ;
+EXE_EXPORT bool ExeTextGetContent( int nId, std::string& sText) ;
+EXE_EXPORT bool ExeTextGetFont( int nId, std::string& sFont) ;
+EXE_EXPORT bool ExeTextGetHeight( int nId, double& dH) ;
+EXE_EXPORT bool ExeTextGetItalic( int nId, bool& bItl) ;
+
+// GeomDb Curve Get
 EXE_EXPORT bool ExeCurveDomain( int nId, double* pdStart, double* pdEnd) ;
 EXE_EXPORT bool ExeCurveLength( int nId, double* pdLen) ;
 EXE_EXPORT bool ExeCurveLengthAtPoint( int nId, const Point3d& ptOn, double dExtend, double* pdLen) ;
@@ -575,6 +571,8 @@ EXE_EXPORT bool ExeArcDeltaN( int nId, double* pdDeltaN) ;
 EXE_EXPORT bool ExeArcNormVersor( int nId, int nRefId, Vector3d& vtNorm) ;
 EXE_EXPORT bool ExeCurveCompoCenter( int nId, int nSimpCrv, int nRefId, Point3d& ptCen) ;
 EXE_EXPORT bool ExeCurveCompoRadius( int nId, int nSimpCrv, double& dRad) ;
+
+// GeomDb Surf Get
 EXE_EXPORT bool ExeSurfArea( int nId, double& dArea) ;
 EXE_EXPORT bool ExeSurfVolume( int nId, double& dVol) ;
 EXE_EXPORT bool ExeSurfFrNormVersor( int nId, int nRefId, Vector3d& vtNorm) ;
@@ -596,14 +594,34 @@ EXE_EXPORT bool ExeSurfTmFacetOppositeSide( int nId, int nFacet, const Vector3d&
 EXE_EXPORT bool ExeSurfTmFacetOppositeSideEx( int nId, int nFacet, const Vector3d& vtDir, int nRefId,
                                               Point3d& ptP1, Point3d& ptPm, Point3d& ptP2, Vector3d& vtIn1, Vector3d& vtOut2, double& dLen, double& dWidth) ;
 EXE_EXPORT bool ExeSurfTmFacetsContact( int nId, int nF1, int nF2, int nRefId, bool& bAdjac, Point3d& ptP1, Point3d& ptP2, double& dAng) ;
+EXE_EXPORT bool ExeSurfBezierGetPoint( int nSurfId, double dU, double dV, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeSurfBezierGetPointD1( int nSurfId, double dU, double dV, int nRefId, Point3d& ptP, Vector3d& vtDerU, Vector3d& vtDerV) ;
+EXE_EXPORT bool ExeSurfBezierGetPointNrmD1( int nSurfId, double dU, double dV, int nRefId, Point3d& ptP, Vector3d& vtN, Vector3d& vtDerU, Vector3d& vtDerV) ;
+EXE_EXPORT int  ExeSurfBezierGetCurveU( int nSurfId, double dV, int nDestGrpId) ;
+EXE_EXPORT int  ExeSurfBezierGetCurveV( int nSurfId, double dU, int nDestGrpId) ;
+EXE_EXPORT bool ExeSurfBezierGetInfo( int nSurfId, int& nDegU, int& nDegV, bool& bIsRat) ;
+EXE_EXPORT int  ExeSurfBezierGetControlCurveU( int nSurfId, int nIndV, int nDestGrpId) ;
+EXE_EXPORT int  ExeSurfBezierGetControlCurveV( int nSurfId, int nIndU, int nDestGrpId) ;
+
+// GeomDb Volume Get
 EXE_EXPORT bool ExeVolZmapVolume( int nId, double& dVol) ;
 EXE_EXPORT int  ExeVolZmapPartCount( int nId) ;
 EXE_EXPORT bool ExeVolZmapPartVolume( int nId, int nPart, double& dVol) ;
-EXE_EXPORT bool ExeTextNormVersor( int nId, int nRefId, Vector3d& vtNorm) ;
-EXE_EXPORT bool ExeTextGetContent( int nId, std::string& sText) ;
-EXE_EXPORT bool ExeTextGetFont( int nId, std::string& sFont) ;
-EXE_EXPORT bool ExeTextGetHeight( int nId, double& dH) ;
-EXE_EXPORT bool ExeTextGetItalic( int nId, bool& bItl) ;
+
+// Geo Snap Vector/Point/Frame
+EXE_EXPORT bool ExeStartPoint( int nId, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeEndPoint( int nId, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeMidPoint( int nId, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeCenterPoint( int nId, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeCentroid( int nId, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeAtParamPoint( int nId, double dU, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeNearPoint( int nId, const Point3d& ptNear, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeIntersectionPoint( int nId1, int nId2, const Point3d& ptNear, int nRefId, Point3d& ptP) ;
+EXE_EXPORT bool ExeStartVector( int nId, int nRefId, Vector3d& vtV) ;
+EXE_EXPORT bool ExeEndVector( int nId, int nRefId, Vector3d& vtV) ;
+EXE_EXPORT bool ExeMidVector( int nId, int nRefId, Vector3d& vtV) ;
+EXE_EXPORT bool ExeAtParamVector( int nId, double dU, int nSide, int nRefId, Vector3d& vtV) ;
+EXE_EXPORT bool ExeFrame( int nId, int nRefId, Frame3d& frFrame) ;
 EXE_EXPORT bool ExePointToIdGlob( Point3d& ptP, int nId) ;
 EXE_EXPORT bool ExePointToIdLoc( Point3d& ptP, int nId) ;
 EXE_EXPORT bool ExeVectorToIdGlob( Vector3d& vtV, int nId) ;