diff --git a/EGkGdbConst.h b/EGkGdbConst.h
index 56f536a..3d6a4cc 100644
--- a/EGkGdbConst.h
+++ b/EGkGdbConst.h
@@ -58,7 +58,8 @@ enum GdbStatus { GDB_ST_OFF = 0,
 
 //----------------- Costanti marcatura oggetti del DB geometrico ---------------
 enum GdbMark { GDB_MK_OFF = 0,
-               GDB_MK_ON =  1} ;
+               GDB_MK_ON =  1,
+               GDB_MK_ON_2 = 2} ;
 
 //----------------- Costante per numero proprietà temporanee -------------------
 const int GDB_NUM_TEMP_PROP = 2 ;
diff --git a/EGkGdbFunct.h b/EGkGdbFunct.h
index 1f6f5d0..e6cddaa 100644
--- a/EGkGdbFunct.h
+++ b/EGkGdbFunct.h
@@ -80,7 +80,7 @@ CalcMark( int nObjMark, int nParentMark)
    if ( nObjMark == GDB_MK_OFF  &&  nParentMark == GDB_MK_OFF)
       return GDB_MK_OFF ;
 
-   return GDB_MK_ON ;
+   return ( nParentMark != GDB_MK_OFF ? nParentMark : nObjMark) ;
 }
 // ovviamente la marcatura si combina con lo stato, nel senso che un oggetto 
 // non visibile non viene nemmeno marcato
\ No newline at end of file
diff --git a/EGkGdbIterator.h b/EGkGdbIterator.h
index d07163b..9689d40 100644
--- a/EGkGdbIterator.h
+++ b/EGkGdbIterator.h
@@ -104,7 +104,7 @@ class __declspec( novtable) IGdbIterator
       virtual bool RevertStatus( void) = 0 ;
       virtual bool GetStatus( int& nStat) const = 0 ;
       virtual bool GetCalcStatus( int& nStat) const = 0 ;
-      virtual bool SetMark( void) = 0 ;
+      virtual bool SetMark(  int nMark = GDB_MK_ON) = 0 ;
       virtual bool ResetMark( void) = 0 ;
       virtual bool GetMark( int& nMark) const = 0 ;
       virtual bool GetCalcMark( int& nMark) const = 0 ;
diff --git a/EGkGeomDB.h b/EGkGeomDB.h
index e8b59a5..fa5bc5d 100644
--- a/EGkGeomDB.h
+++ b/EGkGeomDB.h
@@ -134,7 +134,7 @@ class __declspec( novtable) IGeomDB
       virtual bool RevertStatus( int nId) = 0 ;
       virtual bool GetStatus( int nId, int& nStat) const = 0 ;
       virtual bool GetCalcStatus( int nId, int& nStat) const = 0 ;
-      virtual bool SetMark( int nId) = 0 ;
+      virtual bool SetMark( int nId, int nMark = GDB_MK_ON) = 0 ;
       virtual bool ResetMark( int nId) = 0 ;
       virtual bool GetMark( int nId, int& nMark) const = 0 ;
       virtual bool GetCalcMark( int nId, int& nMark) const = 0 ;
diff --git a/EGrScene.h b/EGrScene.h
index dcb9f8d..a5c649c 100644
--- a/EGrScene.h
+++ b/EGrScene.h
@@ -90,6 +90,7 @@ class IEGrScene
       virtual bool SetExtension( const BBox3d& b3Ext) = 0 ;
       virtual bool UpdateExtension( void) = 0 ;
       virtual bool SetMark( Color colMark) = 0 ;
+      virtual bool SetMark2( Color colMark) = 0 ;
       virtual bool SetSelSurf( Color colSelSurf) = 0 ;
       virtual bool SetLineWidth( int nW) = 0 ;
      // Grid
diff --git a/EInAPI.h b/EInAPI.h
index 236ebb6..541cd44 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -997,7 +997,7 @@ EIN_EXPORT BOOL __stdcall EgtInitScene( HWND hWnd, int nDriver, BOOL b2Buff, int
 EIN_EXPORT BOOL __stdcall EgtGetSceneInfo( wchar_t*& wsInfo) ;
 EIN_EXPORT BOOL __stdcall EgtSetBackground( const int nTopCol[4], const int nBottomCol[4], BOOL bRedraw) ;
 EIN_EXPORT BOOL __stdcall EgtSetLineAttribs( int nWidth) ;
-EIN_EXPORT BOOL __stdcall EgtSetMarkAttribs( const int MarkCol[4]) ;
+EIN_EXPORT BOOL __stdcall EgtSetMarkAttribs( const int MarkCol[4], const int Mark2Col[4]) ;
 EIN_EXPORT BOOL __stdcall EgtSetSelSurfAttribs( const int SelSurfCol[4]) ;
 EIN_EXPORT BOOL __stdcall EgtSetGeoLineAttribs( const int GlCol[4]) ;
 EIN_EXPORT BOOL __stdcall EgtSetGeoTriaAttribs( const int GtCol[4]) ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 1d6df15..207189c 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -487,7 +487,7 @@ EXE_EXPORT bool ExeSetStatus( const INTVECTOR& vIds, int nStat) ;
 EXE_EXPORT bool ExeRevertStatus( int nId) ;
 EXE_EXPORT bool ExeGetStatus( int nId, int* pnStat) ;
 EXE_EXPORT bool ExeGetCalcStatus( int nId, int* pnStat) ;
-EXE_EXPORT bool ExeSetMark( int nId) ;
+EXE_EXPORT bool ExeSetMark( int nId, int nMark = 1) ;
 EXE_EXPORT bool ExeResetMark( int nId) ;
 EXE_EXPORT bool ExeGetMark( int nId, int* pnMark) ;
 EXE_EXPORT bool ExeGetCalcMark( int nId, int* pnMark) ;
@@ -1299,7 +1299,7 @@ EXE_EXPORT bool ExeGetSceneInfo( std::string& sInfo) ;
 EXE_EXPORT bool ExeSetBackground( Color TopCol, Color BottomCol, bool bRedraw) ;
 EXE_EXPORT bool ExeGetBackground( Color& TopCol, Color& BottomCol) ;
 EXE_EXPORT bool ExeSetLineAttribs( int nWidth) ;
-EXE_EXPORT bool ExeSetMarkAttribs( Color MarkCol) ;
+EXE_EXPORT bool ExeSetMarkAttribs( Color MarkCol, Color Mark2Col) ;
 EXE_EXPORT bool ExeSetSelSurfAttribs( Color SelSurfCol) ;
 EXE_EXPORT bool ExeSetGeoLineAttribs( Color GlCol) ;
 EXE_EXPORT bool ExeSetGeoTriaAttribs( Color GtCol) ;