diff --git a/EGkGeoPoint3d.h b/EGkGeoPoint3d.h
index 1429fbb..f15cc1d 100644
--- a/EGkGeoPoint3d.h
+++ b/EGkGeoPoint3d.h
@@ -20,7 +20,7 @@ class _declspec( novtable) IGeoPoint3d : public IGeoObj
 {
    public :
       virtual bool Set( const Point3d& ptP) = 0 ;
-      virtual const Point3d* GetPoint( void) const = 0 ;
+      virtual const Point3d& GetPoint( void) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
@@ -33,7 +33,7 @@ inline IGeoPoint3d* CloneGeoPoint3d( const IGeoObj* pGObj)
 inline bool CopyGeoPoint3d( const IGeoPoint3d* pGPSou, IGeoPoint3d* pGPDest)
                { if ( pGPSou == nullptr  ||  pGPDest == nullptr)
                     return false ;
-                 return pGPDest->Set( *(pGPSou->GetPoint())) ; }
+                 return pGPDest->Set( pGPSou->GetPoint()) ; }
 inline const IGeoPoint3d* GetGeoPoint3d( const IGeoObj* pGObj)
                { if ( pGObj == nullptr  ||  pGObj->GetType() != GEO_PNT3D)
                    return nullptr ;
diff --git a/EGkGeoVector3d.h b/EGkGeoVector3d.h
index 78258ee..db8b338 100644
--- a/EGkGeoVector3d.h
+++ b/EGkGeoVector3d.h
@@ -20,7 +20,7 @@ class _declspec( novtable) IGeoVector3d : public IGeoObj
 {
    public :
       virtual bool Set( const Vector3d& vtV) = 0 ;
-      virtual const Vector3d* GetVector( void) const = 0 ;
+      virtual const Vector3d& GetVector( void) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
@@ -33,7 +33,7 @@ inline IGeoVector3d* CloneGeoVector3d( const IGeoObj* pGObj)
 inline bool CopyGeoVector3d( const IGeoVector3d* pGVSou, IGeoVector3d* pGVDest)
                { if ( pGVSou == nullptr  ||  pGVDest == nullptr)
                     return false ;
-                 return pGVDest->Set( *(pGVSou->GetVector())) ; }
+                 return pGVDest->Set( pGVSou->GetVector()) ; }
 inline const IGeoVector3d* GetGeoVector3d( const IGeoObj* pGObj)
                { if ( pGObj == nullptr  ||  pGObj->GetType() != GEO_VECT3D)
                    return nullptr ;
diff --git a/EgkCurve.h b/EgkCurve.h
new file mode 100644
index 0000000..27f7290
--- /dev/null
+++ b/EgkCurve.h
@@ -0,0 +1,33 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2013-2013
+//----------------------------------------------------------------------------
+// File : EgkCurve.h         Data : 22.11.13          Versione : 1.3a1
+// Contenuto : Dichiarazione della interfaccia ICurve.
+//
+//
+//
+// Modifiche : 22.11.13 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkGeoObj.h"
+
+//----------------------------------------------------------------------------
+class _declspec( novtable) ICurve : public IGeoObj
+{
+   public :
+      virtual bool IsSimple( void) const = 0 ;
+      virtual bool IsClosed( void) const = 0 ;
+      virtual bool GetStartPoint( Point3d& ptStart) const = 0 ;
+      virtual bool GetEndPoint( Point3d& ptEnd) const = 0 ;
+      virtual bool GetDomain( double& dStart, double& dEnd) const = 0 ;
+      virtual bool GetLength( double& dLen) const = 0 ;
+      virtual bool GetPointD1D2( double dU, Point3d& ptPos, Vector3d& vtDer1, Vector3d& vtDer2) const = 0 ;
+      virtual bool GetPoint( double dU, Point3d& ptPos) const = 0 ;
+      virtual bool GetPointTang( double dU, Point3d& ptPos, Vector3d& vtTang) const = 0 ;
+      virtual bool GetPointTangNormCurv( double dU, Point3d& ptPos, Vector3d& vtT, Vector3d& vtN, double& dCurv) const = 0 ;
+      virtual bool Reverse( void) = 0 ;
+} ;
diff --git a/EgkCurveArc.h b/EgkCurveArc.h
new file mode 100644
index 0000000..1324c42
--- /dev/null
+++ b/EgkCurveArc.h
@@ -0,0 +1,54 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2013-2013
+//----------------------------------------------------------------------------
+// File : EgkCurveArc.h       Data : 22.11.13          Versione : 1.3a1
+// Contenuto : Dichiarazione della interfaccia ICurveArc.
+//
+//
+//
+// Modifiche : 22.11.13 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkCurve.h"
+
+//----------------------------------------------------------------------------
+class _declspec( novtable) ICurveArc : public ICurve
+{
+   public :
+      virtual bool Set( const Point3d& ptCen, const Vector3d& vtN, double dRad,
+                        const Vector3d& vtS, double dAngCenDeg, double dDeltaN) = 0 ;
+      virtual bool Set( const Point3d& ptCen, double dRad, double dAngIniDeg, double dAngCenDeg, double dDeltaZ) = 0 ;
+      virtual bool Set( const Point3d& ptCen, double dRad) = 0 ;
+      virtual bool IsInPlaneXY( void) const = 0 ;
+      virtual const Point3d& GetCenter( void) const = 0 ;
+      virtual const Vector3d& GetNormVersor( void) const = 0 ;
+      virtual const Vector3d& GetStartVersor( void) const = 0 ;
+      virtual double GetRadius( void) const = 0 ;
+      virtual double GetAngCenter( void) const = 0 ;
+      virtual double GetDeltaN( void) const = 0 ;
+} ;
+
+//-----------------------------------------------------------------------------
+inline ICurveArc* CreateCurveArc( void)
+               { return (static_cast<ICurveArc*>( CreateGeoObj( KEY_CRV_ARC))) ; }
+inline ICurveArc* CloneCurveArc( const IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_ARC)
+                   return nullptr ;
+                 return (static_cast<ICurveArc*>(pGObj->Clone())) ; }
+inline bool CopyCurveArc( const ICurveArc* pCASou, ICurveArc* pCADest)
+               { if ( pCASou == nullptr  ||  pCADest == nullptr  ||  ! pCASou->IsValid())
+                    return false ;
+                 return pCADest->Set( pCASou->GetCenter(), pCASou->GetNormVersor(), pCASou->GetRadius(),
+                                      pCASou->GetStartVersor(), pCASou->GetAngCenter(), pCASou->GetDeltaN()) ; }
+inline const ICurveArc* GetCurveArc( const IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_ARC)
+                   return nullptr ;
+                 return (static_cast<const ICurveArc*>(pGObj)) ; }
+inline ICurveArc* GetCurveArc( IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_ARC)
+                   return nullptr ;
+                 return (static_cast<ICurveArc*>(pGObj)) ; }
diff --git a/EgkCurveLine.h b/EgkCurveLine.h
new file mode 100644
index 0000000..3342771
--- /dev/null
+++ b/EgkCurveLine.h
@@ -0,0 +1,45 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2013-2013
+//----------------------------------------------------------------------------
+// File : EgkCurveLine.h       Data : 22.11.13          Versione : 1.3a1
+// Contenuto : Dichiarazione della interfaccia ICurveLine.
+//
+//
+//
+// Modifiche : 22.11.13 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkCurve.h"
+
+//----------------------------------------------------------------------------
+class _declspec( novtable) ICurveLine : public ICurve
+{
+   public :
+      virtual bool Set( const Point3d& ptStart, const Point3d& ptEnd) = 0 ;
+      virtual const Point3d& GetStart( void) const = 0 ;
+      virtual const Point3d& GetEnd( void) const = 0 ;
+} ;
+
+//-----------------------------------------------------------------------------
+inline ICurveLine* CreateCurveLine( void)
+               { return (static_cast<ICurveLine*>( CreateGeoObj( KEY_CRV_LINE))) ; }
+inline ICurveLine* CloneCurveLine( const IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_LINE)
+                   return nullptr ;
+                 return (static_cast<ICurveLine*>(pGObj->Clone())) ; }
+inline bool CopyCurveLine( const ICurveLine* pCLSou, ICurveLine* pCLDest)
+               { if ( pCLSou == nullptr  ||  pCLDest == nullptr  ||  ! pCLSou->IsValid())
+                    return false ;
+                 return pCLDest->Set( pCLSou->GetStart(), pCLSou->GetEnd()) ; }
+inline const ICurveLine* GetCurveLine( const IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_LINE)
+                   return nullptr ;
+                 return (static_cast<const ICurveLine*>(pGObj)) ; }
+inline ICurveLine* GetCurveLine( IGeoObj* pGObj)
+               { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_LINE)
+                   return nullptr ;
+                 return (static_cast<ICurveLine*>(pGObj)) ; }