diff --git a/EExImportStl.h b/EExImportStl.h
index a6504c9..f75d09e 100644
--- a/EExImportStl.h
+++ b/EExImportStl.h
@@ -1,13 +1,13 @@
 //----------------------------------------------------------------------------
 //  EgalTech 2014-2014
 //----------------------------------------------------------------------------
-// File : EExImportStl.h          Data : 04.04.14          Versione : 1.5d1
+// File : EExImportStl.h          Data : 16.05.14          Versione : 1.5e3
 // Contenuto : Dichiarazione della interfaccia IImportStl.
 //
 //
 //
 // Modifiche : 04.04.14 DS Creazione modulo.
-//
+//             16.05.15 DS Aggiunto il fattore di scala.
 //
 //----------------------------------------------------------------------------
 
@@ -29,7 +29,7 @@ class __declspec( novtable) IImportStl
 {
    public :
       virtual ~IImportStl( void) {} 
-      virtual bool Import( const std::string& sFile, IGeomDB* pGDB, int nIdGroup) = 0 ;
+      virtual bool Import( const std::string& sFile, IGeomDB* pGDB, int nIdGroup, double dScaleFactor = 1) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EGkBBox3d.h b/EGkBBox3d.h
index 7b122bf..6eda641 100644
--- a/EGkBBox3d.h
+++ b/EGkBBox3d.h
@@ -30,20 +30,20 @@ class EGK_EXPORT BBox3d
       BBox3d( void)                   // Box vuoto (min > MAX)
          : m_ptMin( +INFINITO, +INFINITO, +INFINITO),
            m_ptMax( -INFINITO, -INFINITO, -INFINITO) {}
-      BBox3d( const Point3d ptP)
+      BBox3d( const Point3d& ptP)
          : m_ptMin( ptP), m_ptMax( ptP) {}
       BBox3d( double dX, double dY, double dZ)
          : m_ptMin( dX, dY, dZ), m_ptMax( dX, dY, dZ) {}
-      BBox3d( const Point3d ptP1, const Point3d ptP2) ;
+      BBox3d( const Point3d& ptP1, const Point3d& ptP2) ;
       BBox3d( double dX1, double dY1, double dZ1, double dX2, double dY2, double dZ2) ;
       void Reset( void)
               { m_ptMin = Point3d( +INFINITO, +INFINITO, +INFINITO) ;
                 m_ptMax = Point3d( -INFINITO, -INFINITO, -INFINITO) ; }
-      void Set( const Point3d ptP)
+      void Set( const Point3d& ptP)
               { m_ptMin = ptP ; m_ptMax = ptP ; }
       void Set( double dX, double dY, double dZ)
               { m_ptMin = Point3d( dX, dY, dZ) ; m_ptMax = m_ptMin ; }
-      void Set( const Point3d ptP1, const Point3d ptP2) ;
+      void Set( const Point3d& ptP1, const Point3d& ptP2) ;
       void Set( double dX1, double dY1, double dZ1, double dX2, double dY2, double dZ2) ;
 
    public :
diff --git a/EGkPointGrid3d.h b/EGkPointGrid3d.h
new file mode 100644
index 0000000..83d2be7
--- /dev/null
+++ b/EGkPointGrid3d.h
@@ -0,0 +1,47 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2014-2014
+//----------------------------------------------------------------------------
+// File : EGkPointGrid3d.h         Data : 15.05.14         Versione : 1.5e5
+// Contenuto : Dichiarazione della classe PointGrid3d.
+//             Indicizzazione spaziale di Point3d mediante hash grid.
+//
+//
+// Modifiche : 15.05.14 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGKPoint3d.h"
+#include "/EgtDev/Include/EgtNumCollection.h"
+#include <unordered_map>
+
+//----------------------- 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
+
+//----------------------------------------------------------------------------
+class PointGrid3d
+{
+   public :
+      EGK_EXPORT bool Init( int nBuckets, double dCellDim = 10 * EPS_SMALL) ;
+      EGK_EXPORT bool InsertPoint( const Point3d& ptP, int nId) ;
+      EGK_EXPORT bool Find( const Point3d& ptTest, double dTol, INTVECTOR& vnIds) ;
+      EGK_EXPORT bool Find( const Point3d& ptTest, double dTol, int& nId) ;
+
+   private :
+      inline int Get1dCellNbr( double dCoord) ;
+      inline int PointHash( int nX, int nY, int nZ) ;
+
+   private :
+      typedef std::unordered_multimap<int,std::pair<Point3d,int>> IPNTI_UMMAP ;
+
+   private :
+      double      m_dCellDim ;
+      IPNTI_UMMAP m_MMap ;
+} ;
diff --git a/EgkSurfTriMesh.h b/EgkSurfTriMesh.h
index 920cce9..af82759 100644
--- a/EgkSurfTriMesh.h
+++ b/EgkSurfTriMesh.h
@@ -28,6 +28,8 @@ class __declspec( novtable) ISurfTriMesh : public ISurf
    public :
       virtual bool Copy( const IGeoObj* pGObjSrc) = 0 ;
       virtual bool Init( int nNumVert, int nNumTria) = 0 ;
+      virtual void SetLinearTolerance( double dLinTol) = 0 ;
+      virtual void SetSmoothAngle( double dSmoothAngDeg) = 0 ;
       virtual int AddVertex( const Point3d& ptVert) = 0 ;
       virtual int AddTriangle( const int nIdVert[3]) = 0 ;
       virtual bool AdjustTopology( void) = 0 ;
@@ -38,8 +40,12 @@ class __declspec( novtable) ISurfTriMesh : public ISurf
                                        double dAngRot, double dStepRot) = 0 ;
       virtual bool CreateByScrewing( const PolyLine& PL, const Point3d& ptAx, const Vector3d& vtAx,
                                      double dAngRot, double dStepRot, double dMove) = 0 ;
-      virtual int GetVertexNum( void) const = 0 ;
-      virtual int GetTriangleNum( void) const = 0 ;
+      virtual bool DoCompacting( void) = 0 ;
+      virtual bool DoSewing( const ISurfTriMesh& stmOther, const Frame3d& frOther = GLOB_FRM) = 0 ;
+      virtual int GetVertexSize( void) const = 0 ;
+      virtual int GetTriangleSize( void) const = 0 ;
+      virtual double GetLinearTolerance( void) = 0 ;
+      virtual double GetSmoothAngle( void) = 0 ;
       virtual int GetFirstVertex( Point3d& ptP) const = 0 ;
       virtual int GetNextVertex( int nId, Point3d& ptP) const = 0 ;
       virtual int GetFirstTriangle( Triangle3d& Tria) const = 0 ;