diff --git a/EGkGeoObjType.h b/EGkGeoObjType.h
index bc8c061..afd4c08 100644
--- a/EGkGeoObjType.h
+++ b/EGkGeoObjType.h
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
 //  EgalTech 2014-2015
 //----------------------------------------------------------------------------
-// File : EGkGeoObjType.h        Data : 21.01.15         Versione : 1.6a4
+// File : EGkGeoObjType.h        Data : 05.08.15         Versione : 1.6h2
 // Contenuto : Definizione Tipo degli Oggetti Geometrici. 
 //
 //
@@ -9,6 +9,7 @@
 // Modifiche : 30.04.13 DS Creazione modulo.
 //             27.05.14 DS Agg. EXT_TEXT.
 //             21.01.15 DS Agg. VOL_ZMAP e cambiato valore di EXT_TEXT.
+//             05.08.15 DS Agg. SRF_FLATRGN.
 //----------------------------------------------------------------------------
 
 #pragma once
@@ -32,5 +33,6 @@ enum GeoObjType { GEO_NONE =    0,
                   CRV_BEZ =     ( GEO_CURVE + 2),
                   CRV_COMPO =   ( GEO_CURVE + 3),
                   SRF_TRIMESH = ( GEO_SURF + 0),
+                  SRF_FLATRGN = ( GEO_SURF + 1),
                   VOL_ZMAP =    ( GEO_VOLUME + 0),
                   EXT_TEXT =    ( GEO_EXTRA + 0)} ;
diff --git a/EGkIntersCurves.h b/EGkIntersCurves.h
index 38106f1..6133710 100644
--- a/EGkIntersCurves.h
+++ b/EGkIntersCurves.h
@@ -74,9 +74,11 @@ struct CrvClass {
    double dParS ;
    double dParE ;
    int    nClass ;
-  // costruttore
+  // costruttori
    CrvClass( void)
       : dParS( 0), dParE( 0), nClass( 0) {}
+   CrvClass( double dPS, double dPE, int nC)
+      : dParS( dPS), dParE( dPE), nClass( nC) {}
 } ;
 //! Vettore di CrvClass
 typedef std::vector<CrvClass>  CRVCVECTOR ;
diff --git a/EGkPlane3d.h b/EGkPlane3d.h
index 0ff1082..f55ac9e 100644
--- a/EGkPlane3d.h
+++ b/EGkPlane3d.h
@@ -13,7 +13,7 @@
 
 #pragma once
 
-#include "/EgtDev/Include/EGkPoint3d.h"
+#include "/EgtDev/Include/EGkFrame3d.h"
 
 //-----------------------------------------------------------------------------
 class Plane3d
@@ -21,6 +21,22 @@ class Plane3d
    public :
       Vector3d vtN ;
       double   dDist ;
+
+   public :
+      bool ToGlob( const Frame3d& frRef)
+              { Point3d ptP = ORIG + dDist * vtN ;
+                if ( ! ptP.ToGlob( frRef)  ||  ! vtN.ToGlob( frRef))
+                   return false ;
+                dDist = ( ptP - ORIG) * vtN ; }
+      bool ToLoc( const Frame3d& frRef)
+              { Point3d ptP = ORIG + dDist * vtN ;
+                if ( ! ptP.ToLoc( frRef)  ||  ! vtN.ToLoc( frRef))
+                   return false ;
+                dDist = ( ptP - ORIG) * vtN ; }
+      bool LocToLoc( const Frame3d& frOri, const Frame3d& frDest)
+              { if ( AreSameFrame( frOri, frDest))
+                   return true ;
+                return ( ToGlob( frOri)  &&  ToLoc( frDest)) ; }
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EGkSurfFlatRegion.h b/EGkSurfFlatRegion.h
new file mode 100644
index 0000000..03bc8c1
--- /dev/null
+++ b/EGkSurfFlatRegion.h
@@ -0,0 +1,51 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2015-2015
+//----------------------------------------------------------------------------
+// File : EgkSurfFlatRegion.h      Data : 05.08.15          Versione : 1.6h2
+// Contenuto : Dichiarazione della interfaccia ISurfFlatRegion.
+//
+//
+//
+// Modifiche : 05.08.15 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkSurf.h"
+#include "/EgtDev/Include/EGkIntersCurves.h"
+
+class ISurfTriMesh ;
+
+//----------------------------------------------------------------------------
+class __declspec( novtable) ISurfFlatRegion : public ISurf
+{
+   public :
+      virtual bool CopyFrom( const IGeoObj* pGObjSrc) = 0 ;
+      virtual bool Clear( void) ;
+      virtual bool SetExtLoop( const ICurve& cCrv) = 0 ;
+      virtual bool SetExtLoop( ICurve* pCrv) = 0 ;
+      virtual bool AddIntLoop( const ICurve& cCrv) = 0 ;
+      virtual bool AddIntLoop( ICurve* pCrv) = 0 ;
+      virtual ICurve* GetLoop( int nLoop) const = 0 ;   // nLoop=0 esterno, successivi interni 
+      virtual int  GetIntLoopNumber( void) const = 0 ;
+      virtual const ISurfTriMesh* GetAuxSurf( void) const = 0 ;
+      virtual bool GetCurveClassification( const ICurve& Crv, CRVCVECTOR& ccClass) const = 0 ;
+} ;
+
+//-----------------------------------------------------------------------------
+inline ISurfFlatRegion* CreateSurfFlatRegion( void)
+               { return (static_cast<ISurfFlatRegion*>( CreateGeoObj( SRF_FLATRGN))) ; }
+inline ISurfFlatRegion* CloneSurfFlatRegion( const IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != SRF_FLATRGN)
+                    return nullptr ;
+                 return (static_cast<ISurfFlatRegion*>(pGObj->Clone())) ; }
+inline const ISurfFlatRegion* GetSurfFlatRegion( const IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != SRF_FLATRGN)
+                    return nullptr ;
+                 return (static_cast<const ISurfFlatRegion*>(pGObj)) ; }
+inline ISurfFlatRegion* GetSurfFlatRegion( IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != SRF_FLATRGN)
+                    return nullptr ;
+                 return (static_cast<ISurfFlatRegion*>(pGObj)) ; }
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 8b75131..be9c7b9 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -190,6 +190,7 @@ EXE_EXPORT int  ExeCreatePolygonFromApothem( int nParentId, int nNumSides, const
 EXE_EXPORT int  ExeCreatePolygonFromSide( int nParentId, int nNumSides, const Point3d& ptIni,
                                           const Point3d& ptFin, int nRefType) ;
 // GeomDB Create Surf
+EXE_EXPORT int  ExeCreateSurfFlatRegion( int nParentId, INTVECTOR& vCrvIds) ;
 EXE_EXPORT int  ExeCreateSurfTmBBox( int nParentId, const BBox3d& b3Box, int nRefType) ;
 EXE_EXPORT int  ExeCreateSurfTmBox( int nParentId, const Point3d& ptIni, const Point3d& ptCross,
                                     const Point3d& ptDir, double dHeight, int nRefType) ;
@@ -348,6 +349,7 @@ EXE_EXPORT bool ExeTrimCurveStartEndAtParam( int nId, double dParS, double dParE
 EXE_EXPORT bool ExeExtendCurveStartByLen( int nId, double dLen) ;
 EXE_EXPORT bool ExeExtendCurveEndByLen( int nId, double dLen) ;
 EXE_EXPORT bool ExeTrimExtendCurveByLen( int nId, double dLen, const Point3d& ptNear, int nRefType) ;
+EXE_EXPORT int  ExeTrimCurveWithRegion( int nCrvId, int nRegId, bool bInVsOut, bool bOn, int* pnCount) ;
 EXE_EXPORT int  ExeSplitCurve( int nId, int nParts) ;
 EXE_EXPORT int  ExeSplitCurveAtPoint( int nId, const Point3d& ptOn, int nRefType) ;
 EXE_EXPORT int  ExeSplitCurveAtSelfInters( int nId, int* pnCount) ;
@@ -362,6 +364,7 @@ EXE_EXPORT bool ExeMergeCurvesInCurveCompo( int nId, double dLinTol) ;
 
 // GeomDb Surf Modify
 EXE_EXPORT bool ExeInvertSurface( const INTVECTOR& vIds) ;
+EXE_EXPORT int  ExeExtractSurfFrLoop( int nId, int nLoop, int nDestGrpId) ;
 EXE_EXPORT int  ExeExtractSurfTmFacetLoops( int nId, int nFacet, int nDestGrpId, int* pnCount) ;
 EXE_EXPORT int  ExeExplodeSurfTm( int nId, int* pnCount) ;