diff --git a/EGkSurfTriMesh.h b/EGkSurfTriMesh.h
index ca0e9fb..6b9c714 100644
--- a/EGkSurfTriMesh.h
+++ b/EGkSurfTriMesh.h
@@ -119,7 +119,7 @@ class __declspec( novtable) ISurfTriMesh : public ISurf
       virtual bool Intersect( const ISurfTriMesh& Other) = 0 ;
       virtual bool Subtract( const ISurfTriMesh& Other) = 0 ;
       virtual bool GetSurfClassification( const ISurfTriMesh& ClassifierSurf,
-                             INTVECTOR& vTriaIn, INTVECTOR& vTriaOut, INTVECTOR& vTriaOnP, INTVECTOR& vTriaOnM, INTVECTOR& vTriaIndef) = 0 ;
+                                          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 ;
@@ -162,3 +162,8 @@ typedef std::vector<const ISurfTriMesh*>    CISURFTMPVECTOR ;   // vettore di pu
 typedef std::vector<ISurfTriMesh*>          ISURFTMPVECTOR ;    // vettore di puntatori a ISurfTriMesh
 typedef std::list<ISurfTriMesh*>            ISURFTMPLIST ;      // lista di puntatori a ISurfTriMesh
 typedef std::vector<PtrOwner<ISurfTriMesh>> ISURFTMPOVECTOR ;   // vettore di puntatori esclusivi a ISurfTriMesh
+
+//----------------------------------------------------------------------------
+// Funzioni per Offset
+EGK_EXPORT ISurfTriMesh* CreateSurfTriMeshOffset( const ISurfTriMesh* pStm, double dOffs, double dLinTol) ;
+EGK_EXPORT ISurfTriMesh* CreateSurfTriMeshesOffset( const CISURFTMPVECTOR& vStm, double dOffs, double dLinTol) ;
\ No newline at end of file
diff --git a/EGkVolZmap.h b/EGkVolZmap.h
index bcd4e29..32a3c33 100644
--- a/EGkVolZmap.h
+++ b/EGkVolZmap.h
@@ -9,6 +9,7 @@
 // Modifiche : 22.01.15 DS Creazione modulo.
 //             12.09.23 DS Aggiunto metodo IsTriDexel.
 //             09.03.24 DS Aggiunti SetShowEdges e GetShowEdges.
+//             10.06.25 RE Aggiunte funzioni per Offset di superfici TriMesh chiuse
 //
 //----------------------------------------------------------------------------
 
@@ -30,10 +31,12 @@ class __declspec( novtable) IVolZmap : public IGeoObj
       virtual bool Create( const Point3d& ptO, double dDimX, double dDimY, double dDimZ, double dStep, bool bTriDex) = 0 ;
       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) = 0 ;
+      virtual bool CreateFromTriMesh( const ISurfTriMesh& Surf, double dStep, bool bTriDex, double dExtraBox = 100 * EPS_SMALL) = 0 ;
+      virtual bool CreateFromTriMeshOffset( const CISURFTMPVECTOR& vSurf, double dOffs, double dTol) = 0 ;
       virtual int  GetBlockCount( void) const = 0 ;
       virtual int  GetBlockUpdatingCounter( int nBlock) const = 0 ;
       virtual bool GetBlockTriangles( int nBlock, TRIA3DEXVECTOR& vTria) const = 0 ;
+      virtual ISurfTriMesh* GetSurfTriMesh( void) const = 0 ;
       virtual bool GetEdges( ICURVEPOVECTOR& vpCurve) const = 0 ;
       virtual bool GetVolume( double& dVol) const = 0 ;
       virtual bool IsTriDexel( void) const = 0 ;
@@ -89,6 +92,7 @@ class __declspec( novtable) IVolZmap : public IGeoObj
       virtual bool RemovePart( int nPart) = 0 ;
       virtual int  GetPartMinDistFromPoint( const Point3d& ptP) const = 0 ;
       virtual bool AddSurfTm( const ISurfTriMesh* pStm) = 0 ;
+      virtual bool SubtractSurfTm( const ISurfTriMesh* pStm) = 0 ;
       virtual bool MakeUniform( double dToler) = 0 ;
 } ;
 
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 633afd0..35e0243 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -427,6 +427,7 @@ EXE_EXPORT int  ExeCreateVolZmapEmpty( int nParentId, const Point3d& ptIni, doub
                                        double dDimY, double dDimZ, double dPrec, bool bTriDex, int nRefType) ;
 EXE_EXPORT int  ExeCreateVolZmapByRegionExtrusion( int nParentId, int nSfrId, double dDimZ, double dPrec, bool bTriDex) ;
 EXE_EXPORT int  ExeCreateVolZmapFromSurfTm( int nParentId, int nStmId, double dPrec, bool bTriDex) ;
+EXE_EXPORT int  ExeCreateVolZmapFromSurfTmOffset( int nParentId, const INTVECTOR& vStmId, double dOffs, double dPrec) ;
 EXE_EXPORT bool ExeUpdateVolZmapByAddingSurfTm( int nVolZmapId, int nStmId) ;
 EXE_EXPORT bool ExeUniformVolZmap( int nVolZmapId, double dToler) ;
 
@@ -693,6 +694,7 @@ EXE_EXPORT bool ExeCutSurfTmClosedCurve( int nSurfId, int nCurveId, bool bSaveOn
 EXE_EXPORT bool ExeSurfTmAdd( int nId1, int nId2, bool bTwoColors = false) ;
 EXE_EXPORT bool ExeSurfTmSubtract( int nId1, int nId2, bool bTwoColors = false) ;
 EXE_EXPORT bool ExeSurfTmIntersect( int nId1, int nId2, bool bTwoColors = false) ;
+EXE_EXPORT int  ExeSurfTmOffset( const INTVECTOR& vIds, double dOffs, double dLinTol, int nDestGrpId) ;
 EXE_EXPORT int  ExeSurfTmSplit( int nId, int nSplitterId, int* pnCount) ;
 EXE_EXPORT bool ExeSurfTmCut( int nId, int nCutterId, bool bInVsOut, bool bSaveOnEq) ;
 EXE_EXPORT bool ExeSurfTmSubtractProjectedFacesOnFace( int nSurfId, int nFaceInd, int nDestGrpId,