diff --git a/EXE_GdbGetPocketing.cpp b/EXE_GdbGetPocketing.cpp
index ce166e9..d379379 100644
--- a/EXE_GdbGetPocketing.cpp
+++ b/EXE_GdbGetPocketing.cpp
@@ -59,7 +59,7 @@ ExePocketing( const int nId, double dRad, double dStep, double dAngle, int nType
 
   // eseguo Pocketing
    ICRVCOMPOPOVECTOR vCrvCompoRes ;
-   bool bOk = CalcPocketing( pSfr, dRad, 0, dStep, dAngle, nType, bSmooth, false, false, false, nullptr, vCrvCompoRes) ;
+   bool bOk = CalcPocketing( pSfr, dRad, 0, dStep, dAngle, nType, bSmooth, false, false, false, P_INVALID, nullptr, vCrvCompoRes) ;
    nFirstId = GDB_ID_NULL ;
    nCrvCount = int( vCrvCompoRes.size()) ;
    if ( bOk  &&  nCrvCount > 0) {
diff --git a/EXE_GdbGetSurf.cpp b/EXE_GdbGetSurf.cpp
index ea2bb9f..463529d 100644
--- a/EXE_GdbGetSurf.cpp
+++ b/EXE_GdbGetSurf.cpp
@@ -261,6 +261,25 @@ ExeSurfFrChunkSimpleClassify( int nId1, int nChunk1, int nId2, int nChunk2, doub
    return nRes ;
 }
 
+//----------------------------------------------------------------------------
+bool
+ExeSurfFrChunkCenter( int nId, int nChunk, int nRefId, Point3d& ptCen, Vector3d& vtN)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero la superficie FlatRegion
+   ISurfFlatRegion* pSfr = GetSurfFlatRegion( pGeomDB->GetGeoObj( nId)) ;
+   if ( pSfr == nullptr)
+      return false ;
+  // recupero il centro della parte
+   if ( ! pSfr->GetChunkCentroid( nChunk, ptCen))
+      return false ;
+  // recupero la normale della regione
+   vtN = pSfr->GetNormVersor() ;
+  // gestione trasformazioni ( eventuali)
+   return TransformPoint( pGeomDB, nId, nRefId, ptCen) && TransformVector( pGeomDB, nId, nRefId, vtN) ;
+}
+
 //----------------------------------------------------------------------------
 int
 ExeExtractSurfFrChunkLoops( int nId, int nChunk, int nDestGrpId, int* pnCount)
diff --git a/EXE_GdbObjAttribs.cpp b/EXE_GdbObjAttribs.cpp
index 6b58f2d..b61e9c1 100644
--- a/EXE_GdbObjAttribs.cpp
+++ b/EXE_GdbObjAttribs.cpp
@@ -232,12 +232,12 @@ ExeGetCalcStatus( int nId, int* pnStat)
 
 //-----------------------------------------------------------------------------
 bool
-ExeSetMark( int nId)
+ExeSetMark( int nId, int nMark)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, false)
   // imposto l'evidenziazione
-   bool bOk = pGeomDB->SetMark( nId) ;
+   bool bOk = pGeomDB->SetMark( nId, nMark) ;
   // non produce modifica perchè mark ignorato in salvataggio  
    return bOk ;
 }
diff --git a/EXE_Scene.cpp b/EXE_Scene.cpp
index 4afafcd..fdbcb4e 100644
--- a/EXE_Scene.cpp
+++ b/EXE_Scene.cpp
@@ -109,12 +109,12 @@ ExeSetLineAttribs( int nWidth)
 
 //-----------------------------------------------------------------------------
 bool
-ExeSetMarkAttribs( Color MarkCol)
+ExeSetMarkAttribs( Color MarkCol, Color Mark2Col)
 {
    IEGrScene* pScene = GetCurrScene() ;
    VERIFY_SCENE( pScene, false)
   // imposto il colore del Mark
-   return pScene->SetMark( MarkCol) ;
+   return ( pScene->SetMark( MarkCol)  &&  pScene->SetMark2( Mark2Col)) ;
 }
 
 //-----------------------------------------------------------------------------
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 6408674..b24ba1d 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbObjAttribs.cpp b/LUA_GdbObjAttribs.cpp
index e7e1086..93503d6 100644
--- a/LUA_GdbObjAttribs.cpp
+++ b/LUA_GdbObjAttribs.cpp
@@ -247,12 +247,14 @@ LuaGetCalcStatus( lua_State* L)
 static int
 LuaSetMark( lua_State* L)
 {
-  // 1 parametro : Id
+  // 1 o 2 parametri : Id [, nMark]
    int nId ;
    LuaCheckParam( L, 1, nId)
+   int nMark = 1 ;
+   LuaGetParam( L, 2, nMark) ;
    LuaClearStack( L) ;
   // imposto l'evidenziazione
-   bool bOk = ExeSetMark( nId) ;
+   bool bOk = ExeSetMark( nId, nMark) ;
   // restituisco il risultato
    LuaSetParam( L, bOk) ;
    return 1 ;