diff --git a/EGkLuaAux.h b/EGkLuaAux.h
index 39117a2..e561a7a 100644
--- a/EGkLuaAux.h
+++ b/EGkLuaAux.h
@@ -405,9 +405,9 @@ LuaSetParam( lua_State* L, const SELVECTOR& vSel)
       for ( int i = 1 ; i <= nDim ; ++ i) {
         // creo tavola
          lua_createtable( L, 2, 0) ;
-         lua_pushnumber( L, vSel[i-1].nId) ;
+         lua_pushinteger( L, vSel[i-1].nId) ;
          lua_rawseti( L, -2, 1) ;
-         lua_pushnumber( L, vSel[i-1].nSub) ;
+         lua_pushinteger( L, vSel[i-1].nSub) ;
          lua_rawseti( L, -2, 2) ;
          // la metto nel vettore
          lua_rawseti( L, -2, i) ;
diff --git a/EGkPolyArc.h b/EGkPolyArc.h
index 9446ce8..301a66f 100644
--- a/EGkPolyArc.h
+++ b/EGkPolyArc.h
@@ -35,6 +35,7 @@ class PolyArc
       EGK_EXPORT bool Clear( void) ;
       EGK_EXPORT bool SetExtrusion( const Vector3d& vtExtr) ;
       EGK_EXPORT bool AddUPoint( double dPar, const Point3d& ptP, double dBulge) ;
+      EGK_EXPORT bool ModifyLastParam( double dPar) ;
       EGK_EXPORT bool ModifyLastBulge( double dBulge) ;
       EGK_EXPORT bool Close( void) ;
       EGK_EXPORT bool EraseFirstUPoint( void) ;
diff --git a/EGkPolyLine.h b/EGkPolyLine.h
index 4a8e956..3b7484f 100644
--- a/EGkPolyLine.h
+++ b/EGkPolyLine.h
@@ -35,6 +35,7 @@ class PolyLine
       EGK_EXPORT bool Clear( void) ;
       EGK_EXPORT bool AddUPoint( double dPar, const Point3d& ptP) ;
       EGK_EXPORT bool Close( void) ;
+      EGK_EXPORT bool ModifyLastParam( double dPar) ;
       EGK_EXPORT bool EraseFirstUPoint( void) ;
       EGK_EXPORT bool EraseLastUPoint( void) ;
       EGK_EXPORT bool AddOffsetToU( double dOffset) ;
diff --git a/EGkSurfTriMesh.h b/EGkSurfTriMesh.h
index e71cba3..0741114 100644
--- a/EGkSurfTriMesh.h
+++ b/EGkSurfTriMesh.h
@@ -75,11 +75,13 @@ class __declspec( novtable) ISurfTriMesh : public ISurf
       virtual int  GetFacetFromTria( int nT) const = 0 ;
       virtual bool GetAllTriaInFacet( int nF, INTVECTOR& vT) const = 0 ;
       virtual bool GetFacetLoops( int nF, POLYLINEVECTOR& vPL) const = 0 ;
+      virtual bool GetFacetAdjacencies( int nF, INTMATRIX& vAdj) const = 0 ;
       virtual bool GetFacetNearestEndPoint( int nF, const Point3d& ptNear, Point3d& ptEnd, Vector3d& vtN) const = 0 ;
       virtual bool GetFacetNearestMidPoint( int nF, const Point3d& ptNear, Point3d& ptMid, Vector3d& vtN) const = 0 ;
       virtual bool GetFacetCenter( int nF, Point3d& ptCen, Vector3d& vtN) const = 0 ;
       virtual bool GetFacetNormal( int nF, Vector3d& vtN) const = 0 ;
       virtual bool GetFacetArea( int nF, double& dArea) const = 0 ;
+      virtual bool GetFacetsContact( int nF1, int nF2, bool& bAdjac, Point3d& ptP1, Point3d& ptP2, double& dAng) const = 0 ;
       virtual ISurfTriMesh* CloneFacet( int nF) const = 0 ;
       virtual bool Cut( const Plane3d& plPlane, bool bSaveOnEq) = 0 ;
 } ;
diff --git a/EGnLuaAux.h b/EGnLuaAux.h
index 0698829..6846e04 100644
--- a/EGnLuaAux.h
+++ b/EGnLuaAux.h
@@ -341,6 +341,35 @@ LuaSetParam( lua_State* L, const INTVECTOR& vPar)
    return true ;
 }
 
+//-------------------------------------------------------------------------------
+inline bool
+LuaSetParam( lua_State* L, const INTMATRIX& vPar)
+{
+   try {
+     // recupero prima dimensione
+      int nDim1 = int( vPar.size()) ;
+     // creo tavola principale
+      lua_createtable( L, nDim1, 0) ;
+     // creo e inserisco tavola per ogni componente
+      for ( int i = 1 ; i <= nDim1 ; ++ i) {
+        // recupero seconda dimensione
+         int nDim2 = int( vPar[i-1].size()) ;
+        // creo tavola componente
+         lua_createtable( L, nDim2, 0) ;
+         for ( int j = 1 ; j <= nDim2 ; ++ j) {
+            lua_pushinteger( L, vPar[i-1][j-1]) ;
+            lua_rawseti( L, -2, j) ;
+         }
+         // la metto nel vettore
+         lua_rawseti( L, -2, i) ;
+      }
+   }
+   catch( ...) {
+      return false ;
+   }
+   return true ;
+}
+
 //----------------------------------------------------------------------------
 inline bool
 LuaSetParam( lua_State* L, const DBLVECTOR& vPar)
diff --git a/EXeExecutor.h b/EXeExecutor.h
index e6bef6c..8ac787a 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -516,12 +516,14 @@ EXE_EXPORT int  ExeSurfFrChunkCount( int nId) ;
 EXE_EXPORT int  ExeSurfFrChunkSimpleClassify( int nId1, int nChunk1, int nId2, int nChunk2) ;
 EXE_EXPORT int  ExeSurfTmFacetCount( int nId) ;
 EXE_EXPORT int  ExeSurfTmFacetFromTria( int nId, int nT) ;
+EXE_EXPORT bool ExeSurfTmFacetAdjacencies( int nId, int nFacet, INTMATRIX& vAdj) ;
 EXE_EXPORT bool ExeSurfTmFacetNearestEndPoint( int nId, int nFacet, const Point3d& ptNear, int nRefId,
                                                Point3d& ptEnd, Vector3d& vtN) ;
 EXE_EXPORT bool ExeSurfTmFacetNearestMidPoint( int nId, int nFacet, const Point3d& ptNear, int nRefId,
                                                Point3d& ptMid, Vector3d& vtN) ;
 EXE_EXPORT bool ExeSurfTmFacetCenter( int nId, int nFacet, int nRefId, Point3d& ptCen, Vector3d& vtN) ;
 EXE_EXPORT bool ExeSurfTmFacetNormVersor( int nId, int nFacet, int nRefId, Vector3d& vtNorm) ;
+EXE_EXPORT bool ExeSurfTmFacetsContact( int nId, int nF1, int nF2, int nRefId, bool& bAdjac, Point3d& ptP1, Point3d& ptP2, double& dAng) ;
 EXE_EXPORT bool ExeTextNormVersor( int nId, int nRefId, Vector3d& vtNorm) ;
 EXE_EXPORT bool ExeTextGetContent( int nId, std::string& sText) ;
 EXE_EXPORT bool ExePointToIdGlob( Point3d& ptP, int nId) ;
diff --git a/EgtNumCollection.h b/EgtNumCollection.h
index cb950c4..d21bf46 100644
--- a/EgtNumCollection.h
+++ b/EgtNumCollection.h
@@ -23,8 +23,9 @@ typedef std::list<bool>      BOOLLIST ;    // lista di bool
 
 //----------------------------------------------------------------------------
 // Raccolte di interi
-typedef std::vector<int>    INTVECTOR ;   // vettore di interi
-typedef std::list<int>      INT_LIST ;    // lista di interi (con _ per non collidere con Win)
+typedef std::vector<int>                 INTVECTOR ;   // vettore di interi
+typedef std::list<int>                   INT_LIST ;    // lista di interi (con _ per non collidere con Win)
+typedef std::vector<std::vector<int>>    INTMATRIX ;   // matrice di interi
 
 //----------------------------------------------------------------------------
 // Raccolte di interi senza segno