diff --git a/EGkPlane3d.h b/EGkPlane3d.h
index e0868a6..d377703 100644
--- a/EGkPlane3d.h
+++ b/EGkPlane3d.h
@@ -8,6 +8,7 @@
 //
 // Modifiche : 08.04.14 DS Creazione modulo.
 //             25.02.15 DS Agg. PointInPlane*.
+//             05.09.25 RE Agg. funzioni di confronto tra due piani
 //
 //----------------------------------------------------------------------------
 
@@ -154,3 +155,28 @@ PointInPlaneExact( const Point3d& ptP, const Plane3d& plPlane)
 {
    return ( abs( (( ptP - ORIG) * plPlane.GetVersN()) - plPlane.GetDist()) < EPS_ZERO) ;
 }
+
+//-----------------------------------------------------------------------------
+inline bool
+AreSamePlaneEpsilon( const Plane3d& plPlaneA, const Plane3d& plPlaneB, double dToler)
+{
+   return ( AreSameVectorEpsilon( plPlaneA.GetVersN(), plPlaneB.GetVersN(), dToler)  &&
+            PointInPlaneEpsilon( plPlaneA.GetPoint(), plPlaneB, dToler)) ;
+}
+
+//-----------------------------------------------------------------------------
+inline bool
+AreSamePlaneApprox( const Plane3d& plPlaneA, const Plane3d& plPlaneB)
+{
+   return ( AreSameVectorApprox( plPlaneA.GetVersN(), plPlaneB.GetVersN())  &&
+            PointInPlaneApprox( plPlaneA.GetPoint(), plPlaneB)) ;
+}
+
+//-----------------------------------------------------------------------------
+inline bool
+AreSamePlaneExact( const Plane3d plPlaneA, const Plane3d& plPlaneB)
+{
+   return ( AreSameVectorExact( plPlaneA.GetVersN(), plPlaneB.GetVersN())  &&
+            PointInPlaneExact( plPlaneA.GetPoint(), plPlaneB)) ;
+}
+
diff --git a/EGkSurfTriMeshAux.h b/EGkSurfTriMeshAux.h
index faa92a8..25ea565 100644
--- a/EGkSurfTriMeshAux.h
+++ b/EGkSurfTriMeshAux.h
@@ -18,6 +18,7 @@
 //----------------------------------------------------------------------------
 // Costanti per offset
 static int STMOFF_FILLET = 0 ;
+static int STMOFF_CHAMFER = 1 ;
 static int STMOFF_EXTEND = 2 ;
 
 //----------------------------------------------------------------------------
diff --git a/EGkVolZmap.h b/EGkVolZmap.h
index 08dcc9a..b158195 100644
--- a/EGkVolZmap.h
+++ b/EGkVolZmap.h
@@ -33,8 +33,6 @@ class __declspec( novtable) IVolZmap : public IGeoObj
       virtual bool CreateEmpty( const Point3d& ptO, double dDimX, double dDimY, double dDimZ, double dStep, bool bTriDex) = 0 ;
       virtual bool CreateFromFlatRegion( const ISurfFlatRegion& Surf, double dDimZ, double dStep, bool bTriDex) = 0 ;
       virtual bool CreateFromTriMesh( const ISurfTriMesh& Surf, double dStep, bool bTriDex, double dExtraBox = 0.) = 0 ;
-      virtual bool CreateFromTriMeshOffset( const CISURFTMPVECTOR& vSurf, double dOffs, double dTol, int nType = STMOFF_FILLET) = 0 ;
-      virtual bool CreateFromTriMeshThickeningOffset( const CISURFTMPVECTOR& vSurf, double dOffs, double dTol, int nType = STMOFF_FILLET) = 0 ;
       virtual int  GetBlockCount( void) const = 0 ;
       virtual int  GetBlockUpdatingCounter( int nBlock) const = 0 ;
       virtual bool GetBlockTriangles( int nBlock, TRIA3DEXVECTOR& vTria) const = 0 ;