diff --git a/EGkDistPointSurfBz.h b/EGkDistPointSurfBz.h
new file mode 100644
index 0000000..89e3013
--- /dev/null
+++ b/EGkDistPointSurfBz.h
@@ -0,0 +1,67 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2018-2023
+//----------------------------------------------------------------------------
+// File : EgkDistPointSurfBz.cpp     Data : 29.10.25        Versione : 2.7j3
+// Contenuto : Dichiarazione della classe distanza Punto da superficie di Bezier.
+//
+//
+//
+// Modifiche : 29.10.25 DB Creazione modulo.
+//             
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkSurfBezier.h"
+
+//----------------------- Macro per import/export ----------------------------
+#undef EGK_EXPORT
+#if defined( I_AM_EGK)            // da definirsi solo nella DLL
+   #define EGK_EXPORT __declspec( dllexport)
+#else
+   #define EGK_EXPORT __declspec( dllimport)
+#endif
+
+//----------------------------------------------------------------------------
+// Calcola la distanza tra punto e superficie bezier.
+// Risultati :
+// - distanza
+// - punto sulla superficie a minima distanza
+// - corrispettivo punto nello spazio parametrico
+// - normale alla superficie in quel punto
+// - indicazione se il punto di riferimento è dalla parte interna o esterna della superficie ( se chiusa ).
+// - indicazione se il punto di riferimento è a destra o sinistra della superficie ( se aperta )
+//----------------------------------------------------------------------------
+class DistPointSurfBz
+{
+   public :
+      EGK_EXPORT DistPointSurfBz( const Point3d& ptP, const ISurfBezier& srfBz) ;
+
+   public :
+      EGK_EXPORT bool GetDist( double& dDist) const ;
+      EGK_EXPORT bool IsEpsilon( double dTol) const
+                       { return ( m_dDist >= 0.  &&  ( m_dDist < EPS_ZERO || m_dDist < dTol)) ; }
+      EGK_EXPORT bool IsSmall( void) const
+                       { return IsEpsilon( EPS_SMALL) ; }
+      EGK_EXPORT bool IsZero( void) const
+                       { return IsEpsilon( EPS_ZERO) ; }
+      EGK_EXPORT bool GetMinDistPoint( Point3d& ptMinDistPoint) const ;
+      EGK_EXPORT bool GetParamPoint( Point3d& ptParamPoint) const ;
+      EGK_EXPORT bool GetNorm( Vector3d& vtN) const ;
+      EGK_EXPORT bool IsPointInside( void) const
+                        { return ( m_bIsInside  &&  m_bIsSurfClosed) ; }
+      EGK_EXPORT bool IsPointOnLeftSide( void) const
+                        { return m_bIsInside ;}
+
+   private :
+      void Calculate( const Point3d& ptP, const ISurfBezier& srfBz) ;
+
+   private :
+      double  m_dDist ;                   // Minima distanza del punto dalla superficie
+      Point3d m_ptMinDistPoint ;          // Punto sulla superficie a minima distanza
+      Point3d m_ptParam ;                 // punto corrispondente nello spazio parametrico
+      Vector3d m_vtN ;                    // normale alla superficie nel punto a minima distanza
+      bool    m_bIsInside ;               // Flag per punto interno o esterno alla superficie ( se chiusa )
+      bool    m_bIsSurfClosed ;           // Flag per superficie aperta o chiusa
+} ;
diff --git a/EGkSurfBezier.h b/EGkSurfBezier.h
index cafefe3..8622e5b 100644
--- a/EGkSurfBezier.h
+++ b/EGkSurfBezier.h
@@ -82,7 +82,7 @@ class __declspec( novtable) ISurfBezier : public ISurf
       virtual ISurfTriMesh* GetApproxSurf( double dTol, double dSideMin = 100 * EPS_SMALL, bool bUpdateEdges = false) const = 0 ;
       virtual bool GetLeaves ( std::vector<std::tuple<int, Point3d, Point3d>>& vLeaves) const = 0 ;
       virtual bool GetTriangles2D( std::vector<std::tuple<int,Point3d, Point3d, Point3d>>& vTria2D) const = 0 ;
-      virtual bool UnprojectPointFromStm( int nT, const Point3d& ptI, Point3d& ptSP, int nIL) const = 0 ;
+      virtual bool UnprojectPointFromStm( int nT, const Point3d& ptI, Point3d& ptSP, int nIL = 5) const = 0 ;
       virtual bool UnprojectPointFromStm( int nT, const Point3d& ptI, Point3d& ptSP, int nIL, const Point3d& ptIPrev, bool* bTroughEdge = nullptr) const = 0 ;
       virtual bool UnprojectPoint( const Point3d& pt3D, Point3d& ptParam, const Point3d& ptIPrev, bool* bTroughEdge = nullptr, const Plane3d* plCut = nullptr) const = 0 ;
       virtual bool UnprojectCurveFromStm( const ICurveComposite* pCC, ICRVCOMPOPVECTOR& vpCC, const Plane3d* pPlCut) const = 0 ;