diff --git a/EXE_GdbModifyVol.cpp b/EXE_GdbModifyVol.cpp
index fa47142..d63b894 100644
--- a/EXE_GdbModifyVol.cpp
+++ b/EXE_GdbModifyVol.cpp
@@ -498,6 +498,55 @@ ExeVolZmapGetDepth( int nId, const Point3d& ptP, const Vector3d& vtDir, int nRef
    return bOk ;
 }
 
+//----------------------------------------------------------------------------
+int
+ExeVolZmapGetEdges( int nId, int nDestGrpId, int* pnCount)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
+  // recupero lo Zmap
+   const IVolZmap* pVZM = GetVolZmap( pGeomDB->GetGeoObj( nId)) ;
+   bool bOk = ( pVZM != nullptr) ;
+  // recupero il riferimento del solido
+   Frame3d frSurf ;
+   bOk = bOk && pGeomDB->GetGlobFrame( nId, frSurf) ;
+  // recupero il riferimento di destinazione
+   Frame3d frDest ;
+   bOk = bOk && pGeomDB->GetGroupGlobFrame( nDestGrpId, frDest) ;
+  // ne determino gli spigoli
+   ICURVEPOVECTOR vpCurve ;
+   bOk = bOk  &&  pVZM->GetEdges( vpCurve) ;
+  // inserisco gli spigoli come curve nel DB
+   int nFirstId = GDB_ID_NULL ;
+   int nCount = 0 ;
+   for ( int i = 0 ; i < int( vpCurve.size()) ; ++ i) {
+     // lo porto nel riferimento destinazione
+      bOk = bOk && vpCurve[i]->LocToLoc( frSurf, frDest) ;
+     // lo inserisco nel DB geometrico
+      int nNewId = ( bOk ? pGeomDB->AddGeoObj( GDB_ID_NULL, nDestGrpId, Release( vpCurve[i])) : GDB_ID_NULL) ;
+      bOk = bOk && ( nNewId != GDB_ID_NULL) ;
+     // copio il materiale
+      bOk = bOk && pGeomDB->CopyMaterial( nId, nNewId) ;
+     // aggiorno contatori
+      if ( bOk  &&  nFirstId == GDB_ID_NULL)
+         nFirstId = nNewId ;
+      if ( bOk)
+         ++ nCount ;
+   }
+   ExeSetModified() ;
+  // se richiesto, salvo il comando Lua equivalente
+   if ( IsCmdLog()) {
+      string sLua = "EgtGetSurfTmSilhouette(" + ToString( nId) + ",{" +
+                                                ToString( nDestGrpId) + ")" +
+                    " -- Id1=" + ToString( nFirstId) + ",Nbr=" + ToString( nCount) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
+  // restituisco risultati
+   if ( pnCount != nullptr)
+      *pnCount = nCount ;
+   return nFirstId ;
+}
+
 //----------------------------------------------------------------------------
 bool
 ExeVolZmapAvoidBox( int nId, const Frame3d& frBox, const Vector3d& vtDiag, double dSafeDist, int nRefType)
diff --git a/EXE_GeoInters.cpp b/EXE_GeoInters.cpp
index 517d74e..5a348fd 100644
--- a/EXE_GeoInters.cpp
+++ b/EXE_GeoInters.cpp
@@ -636,7 +636,7 @@ MyChainCurvesForSurfSurfInters( const BIPNTVECTOR& vBpt, IGeomDB* pGeomDB, int n
               ! AreSamePointApprox( ptNear, ( bInvert ? vBpt[nInd].first : vBpt[nInd].second)))
             return false ;
         // aggiorno il prossimo near
-         ptNear = vBpt[nInd].second ;
+         ptNear = ( bInvert ? vBpt[nInd].first : vBpt[nInd].second) ;
       }
      // se lunghezza curva inferiore a 5 volte la tolleranza, la salto
       double dCrvLen ;
@@ -647,7 +647,6 @@ MyChainCurvesForSurfSurfInters( const BIPNTVECTOR& vBpt, IGeomDB* pGeomDB, int n
      // la salvo
       vCrvCompo.emplace_back( Release( pCrvCompo)) ;
    }
-   //return true ;
   // Ripeto concatenamento sulle curve appena create (per riempire eventuali mini buchi)
    chainC.Init( false, dToler, int( vCrvCompo.size())) ;
    for ( int i = 0 ; i < int( vCrvCompo.size()) ; ++ i) {
diff --git a/LUA_GdbModifyVol.cpp b/LUA_GdbModifyVol.cpp
index f516bb3..9ae74ff 100644
--- a/LUA_GdbModifyVol.cpp
+++ b/LUA_GdbModifyVol.cpp
@@ -355,6 +355,30 @@ LuaVolZmapGetDepth( lua_State* L)
    }
    return 2 ;
 }
+//----------------------------------------------------------------------------
+static int
+LuaVolZmapGetEdges( lua_State* L)
+{
+  // 2 parametri : nId, nDestGrpId
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   int nDestGrpId ;
+   LuaCheckParam( L, 2, nDestGrpId)
+   LuaClearStack( L) ;
+  // eseguo calcolo profondità dal punto lungo la direzione
+   int nCount ;
+   int nFirstId = ExeVolZmapGetEdges( nId, nDestGrpId, &nCount) ;
+  // restituisco il risultato
+   if ( nFirstId != GDB_ID_NULL) {
+      LuaSetParam( L, nFirstId) ;
+      LuaSetParam( L, nCount) ;
+   }
+   else {
+      LuaSetParam( L) ;
+      LuaSetParam( L) ;
+   }
+   return 2 ;
+}
 
 //----------------------------------------------------------------------------
 static int
@@ -466,6 +490,7 @@ LuaInstallGdbModifyVol( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapGetToolOutline", LuaVolZmapGetToolOutline) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapMillingStep", LuaVolZmapMillingStep) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapGetDepth", LuaVolZmapGetDepth) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapGetEdges", LuaVolZmapGetEdges) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapAvoidBox", LuaVolZmapAvoidBox) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapAvoidCylinder", LuaVolZmapAvoidCylinder) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapAvoidSphere", LuaVolZmapAvoidSphere) ;