diff --git a/EGkSurfTriMesh.h b/EGkSurfTriMesh.h
index adc74d1..4b00d99 100644
--- a/EGkSurfTriMesh.h
+++ b/EGkSurfTriMesh.h
@@ -25,6 +25,9 @@ const int SVT_DEL = - 2 ;            // vertice o triangolo cancellato
 inline bool IsValidSvt( int nSvt)
                { return ( nSvt != SVT_NULL  &&  nSvt != SVT_DEL) ; }
 
+//----------------------------------------------------------------------------
+const double MAX_EDGE_LEN_STD = 5000.0 ;
+
 //----------------------------------------------------------------------------
 class __declspec( novtable) ISurfTriMesh : public ISurf
 {
@@ -104,6 +107,7 @@ class __declspec( novtable) ISurfTriMesh : public ISurf
       virtual bool GetSurfClassification( const ISurfTriMesh& ClassifierSurf,
                              INTVECTOR& vTriaIn, INTVECTOR& vTriaOut, INTVECTOR& vTriaOnP, INTVECTOR& vTriaOnM, INTVECTOR& vTriaIndef) = 0 ;
       virtual bool CutWithOtherSurf( const ISurfTriMesh& CutterSurf, bool bInVsOut, bool bSaveOnEq) = 0 ;
+      virtual bool Repair( double dMaxEdgeLen = MAX_EDGE_LEN_STD) = 0 ;
       virtual bool GetAllTriaOverlapBox( const BBox3d& b3Box, INTVECTOR& vT) const = 0 ;
       virtual const BBox3d& GetAllTriaBox( void) const = 0 ;
       virtual int  GetPartCount( void) const = 0 ;