diff --git a/EXE_GdbModifyVol.cpp b/EXE_GdbModifyVol.cpp
index d63b894..299759b 100644
--- a/EXE_GdbModifyVol.cpp
+++ b/EXE_GdbModifyVol.cpp
@@ -96,13 +96,45 @@ ExeExplodeVolume( int nId, int* pnCount)
    return nFirstId ;
 }
 
+//-----------------------------------------------------------------------------
+bool
+ExeVolZmapGetPartBBox( int nId, int nPart, int nFlag, BBox3d& b3Box)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero lo Zmap
+   IVolZmap* pVZM = GetVolZmap( pGeomDB->GetGeoObj( nId)) ;
+   if ( pVZM == nullptr)
+      return false ;
+  // recupero il bounding box della parte dell'oggetto in locale
+   return pVZM->GetPartLocalBBox( nPart, b3Box, nFlag) ;
+}
+
+//-----------------------------------------------------------------------------
+bool
+ExeVolZmapGetPartBBoxGlob( int nId, int nPart, int nFlag, BBox3d& b3Box)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero lo Zmap
+   IVolZmap* pVZM = GetVolZmap( pGeomDB->GetGeoObj( nId)) ;
+   if ( pVZM == nullptr)
+      return false ;
+  // recupero il riferimento globale del gruppo cui appartiene
+   Frame3d frGlob ;
+   if ( nId != GDB_ID_ROOT  &&  ! pGeomDB->GetGroupGlobFrame( pGeomDB->GetParentId( nId), frGlob))
+      return false ;
+  // recupero il bounding box della parte dell'oggetto in globale
+   return pVZM->GetPartBBox( nPart, frGlob, b3Box, nFlag) ;
+}
+
 //-------------------------------------------------------------------------------
 int
 ExeCopyVolZmapPart( int nId, int nPart, int nDestGrpId)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
-  // recupero lo Zmap e copio la parte indicata
+  // recupero lo Zmap
    IVolZmap* pVZM = GetVolZmap( pGeomDB->GetGeoObj( nId)) ;
    if ( pVZM == nullptr)
       return GDB_ID_NULL ;
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 6f7a0ff..6fcacc0 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbModifySurf.cpp b/LUA_GdbModifySurf.cpp
index e8ed8d1..4ed44fe 100644
--- a/LUA_GdbModifySurf.cpp
+++ b/LUA_GdbModifySurf.cpp
@@ -347,7 +347,7 @@ LuaSurfTmGetFacetBBoxGlob( lua_State* L)
    int nFlag ;
    LuaCheckParam( L, 3, nFlag)
    LuaClearStack( L) ;
-  // recupero il bounding box della faccia in locale
+  // recupero il bounding box della faccia in globale
    BBox3d b3Box ;
    bool bOk = ExeSurfTmGetFacetBBoxGlob( nId, nFacet, nFlag, b3Box) ;
   // restituisco il risultato
diff --git a/LUA_GdbModifyVol.cpp b/LUA_GdbModifyVol.cpp
index 9ae74ff..fc9bbeb 100644
--- a/LUA_GdbModifyVol.cpp
+++ b/LUA_GdbModifyVol.cpp
@@ -39,6 +39,52 @@ LuaExplodeVolume( lua_State* L)
    return 2 ;
 }
 
+//----------------------------------------------------------------------------
+static int
+LuaVolZmapGetPartBBox( lua_State* L)
+{
+  // 3 parametri : nId, nPart, nFlag
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   int nPart ;
+   LuaCheckParam( L, 2, nPart)
+   int nFlag ;
+   LuaCheckParam( L, 3, nFlag)
+   LuaClearStack( L) ;
+  // recupero il bounding box della parte in locale
+   BBox3d b3Box ;
+   bool bOk = ExeVolZmapGetPartBBox( nId, nPart, nFlag, b3Box) ;
+  // restituisco il risultato
+   if ( bOk)
+      LuaSetParam( L, b3Box) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
+//----------------------------------------------------------------------------
+static int
+LuaVolZmapGetPartBBoxGlob( lua_State* L)
+{
+  // 3 parametri : nId, nPart, nFlag
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   int nPart ;
+   LuaCheckParam( L, 2, nPart)
+   int nFlag ;
+   LuaCheckParam( L, 3, nFlag)
+   LuaClearStack( L) ;
+  // recupero il bounding box della parte in globale
+   BBox3d b3Box ;
+   bool bOk = ExeVolZmapGetPartBBoxGlob( nId, nPart, nFlag, b3Box) ;
+  // restituisco il risultato
+   if ( bOk)
+      LuaSetParam( L, b3Box) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
 //----------------------------------------------------------------------------
 static int
 LuaCopyVolZmapPart( lua_State* L)
@@ -478,6 +524,8 @@ LuaInstallGdbModifyVol( LuaMgr& luaMgr)
 {
    bool bOk = ( &luaMgr != nullptr) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtExplodeVolume", LuaExplodeVolume) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapGetPartBBox", LuaVolZmapGetPartBBox) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapGetPartBBoxGlob", LuaVolZmapGetPartBBoxGlob) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCopyVolZmapPart", LuaCopyVolZmapPart) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtRemoveVolZmapPart", LuaRemoveVolZmapPart) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapSetStdTool", LuaVolZmapSetStdTool) ;