diff --git a/EXE_GdbModifyVol.cpp b/EXE_GdbModifyVol.cpp
index 1e9ddc1..0af7bc7 100644
--- a/EXE_GdbModifyVol.cpp
+++ b/EXE_GdbModifyVol.cpp
@@ -338,7 +338,7 @@ ExeVolZmapMillingStep( int nId, const Point3d& ptPs, const Vector3d& vtDs, const
 
 //----------------------------------------------------------------------------
 bool
-ExeVolZmapGetDepth( int nId, const Point3d& ptP, const Vector3d& vtDir, int nRefType,
+ExeVolZmapGetDepth( int nId, const Point3d& ptP, const Vector3d& vtDir, int nRefType, bool bExact,
                     double& dInLen, double& dOutLen)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
@@ -351,13 +351,14 @@ ExeVolZmapGetDepth( int nId, const Point3d& ptP, const Vector3d& vtDir, int nRef
    Vector3d vtVL = GetVectorLocal( pGeomDB, vtDir, nRefType, frLoc) ;
   // recupero lo Zmap e calcolo profondità
    IVolZmap* pVZM = GetVolZmap( pGeomDB->GetGeoObj( nId)) ;
-   bOk = bOk && ( pVZM != nullptr  &&  pVZM->GetDepth( ptP, vtDir, dInLen, dOutLen)) ;
+   bOk = bOk && ( pVZM != nullptr  &&  pVZM->GetDepth( ptP, vtDir, dInLen, dOutLen, bExact)) ;
    ExeSetModified() ;
   // se richiesto, salvo il comando Lua equivalente
    if ( IsCmdLog()) {
       string sLua = "EgtVolZmapGetDepth(" + IdToString( nId) + ",{" +
                                             ToString( ptP) + "},{" +
                                             ToString( vtDir) + "}," +
+                                            ( bExact ? "true" : "false") + "," +
                                             RefTypeToString( nRefType) + ")" +
                     " -- Ok=" + ToString( bOk) + "," + ToString( dInLen) + "," + ToString( dOutLen) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
diff --git a/LUA_GdbModifyVol.cpp b/LUA_GdbModifyVol.cpp
index d53b27e..9e604cc 100644
--- a/LUA_GdbModifyVol.cpp
+++ b/LUA_GdbModifyVol.cpp
@@ -232,7 +232,7 @@ LuaVolZmapMillingStep( lua_State* L)
 static int
 LuaVolZmapGetDepth( lua_State* L)
 {
-  // 3 o 4 parametri : nId, ptP, vtDir [, nRefType]
+  // 3 o 4 o 5 parametri : nId, ptP, vtDir [, nRefType] [, bExact]
    int nId ;
    LuaCheckParam( L, 1, nId)
    Point3d ptP ;
@@ -240,11 +240,15 @@ LuaVolZmapGetDepth( lua_State* L)
    Vector3d vtDir ;
    LuaCheckParam( L, 3, vtDir)
    int nRefType = RTY_DEFAULT ;
-   LuaGetParam( L, 4, nRefType) ;
+   bool bExact = false ;
+   if ( LuaGetParam( L, 4, nRefType))
+      LuaGetParam( L, 5, bExact) ;
+   else
+      LuaGetParam( L, 4, bExact) ;
    LuaClearStack( L) ;
   // eseguo calcolo profondità dal punto lungo la direzione
    double dLen1, dLen2 ;
-   bool bOk = ExeVolZmapGetDepth( nId, ptP, vtDir, nRefType, dLen1, dLen2) ;
+   bool bOk = ExeVolZmapGetDepth( nId, ptP, vtDir, nRefType, bExact, dLen1, dLen2) ;
   // restituisco il risultato
    if ( bOk) {
       LuaSetParam( L, dLen1) ;