diff --git a/EXE_GdbCreateVol.cpp b/EXE_GdbCreateVol.cpp
index bbcb8e0..53c48f8 100644
--- a/EXE_GdbCreateVol.cpp
+++ b/EXE_GdbCreateVol.cpp
@@ -27,7 +27,7 @@ using namespace std ;
 //-------------------------------------------------------------------------------
 int
 ExeCreateVolZmap( int nParentId, const Point3d& ptIni, double dDimX, double dDimY, double dDimZ,
-                  double dPrec, int nRefType)
+                  double dPrec, bool bTriDex, int nRefType)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
@@ -45,7 +45,7 @@ ExeCreateVolZmap( int nParentId, const Point3d& ptIni, double dDimX, double dDim
   // creo lo Zmap nel suo riferimento intrinseco
    PtrOwner<IVolZmap> pVZM( CreateVolZmap()) ;
    bOk = bOk && ! IsNull( pVZM) ;
-   bOk = bOk && pVZM->Create( ORIG, dDimX, dDimY, dDimZ, dPrec) ;
+   bOk = bOk && pVZM->Create( ORIG, dDimX, dDimY, dDimZ, dPrec, bTriDex) ;
   // lo porto nel riferimento locale
    bOk = bOk && pVZM->ToGlob( frBox) ;
   // inserisco lo Zmap nel DB
@@ -59,6 +59,7 @@ ExeCreateVolZmap( int nParentId, const Point3d& ptIni, double dDimX, double dDim
                                        ToString( dDimY) + "," +
                                        ToString( dDimZ) + "," +
                                        ToString( dPrec) + "," +
+                                       ( bTriDex ? "true" : "false") + "," +
                                        RefTypeToString( nRefType) + ")" +
                     " -- Id=" + ToString( nNewId) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
@@ -69,7 +70,7 @@ ExeCreateVolZmap( int nParentId, const Point3d& ptIni, double dDimX, double dDim
 
 //-------------------------------------------------------------------------------
 int
-ExeCreateVolZmapByRegionExtrusion( int nParentId, int nSfrId, double dDimZ, double dPrec)
+ExeCreateVolZmapByRegionExtrusion( int nParentId, int nSfrId, double dDimZ, double dPrec, bool bTriDex)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
@@ -86,7 +87,7 @@ ExeCreateVolZmapByRegionExtrusion( int nParentId, int nSfrId, double dDimZ, doub
   // creo lo Zmap nel suo riferimento intrinseco
    PtrOwner<IVolZmap> pVZM( CreateVolZmap()) ;
    bOk = bOk && ! IsNull( pVZM) ;
-   bOk = bOk && pVZM->CreateFromFlatRegion( *pSfr, dDimZ, dPrec) ;
+   bOk = bOk && pVZM->CreateFromFlatRegion( *pSfr, dDimZ, dPrec, bTriDex) ;
   // lo porto nel riferimento di destinazione
    bOk = bOk && pVZM->LocToLoc( frSfr, frDest) ;
   // inserisco lo Zmap nel DB
@@ -97,7 +98,8 @@ ExeCreateVolZmapByRegionExtrusion( int nParentId, int nSfrId, double dDimZ, doub
       string sLua = "EgtVolZmapByRegionExtrusion(" + IdToString( nParentId) + "," +
                                                      ToString( nSfrId) + "," +
                                                      ToString( dDimZ) + "," +
-                                                     ToString( dPrec) + ")" +
+                                                     ToString( dPrec) + "," +
+                                                     ( bTriDex ? "true" : "false") + ")" +
                     " -- Id=" + ToString( nNewId) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
    }
@@ -107,7 +109,7 @@ ExeCreateVolZmapByRegionExtrusion( int nParentId, int nSfrId, double dDimZ, doub
 
 //-------------------------------------------------------------------------------
 int
-ExeCreateVolZmapFromSurfTm( int nParentId, int nStmId, double dPrec)
+ExeCreateVolZmapFromSurfTm( int nParentId, int nStmId, double dPrec, bool bTriDex)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
@@ -124,7 +126,7 @@ ExeCreateVolZmapFromSurfTm( int nParentId, int nStmId, double dPrec)
   // creo lo Zmap nel suo riferimento intrinseco
    PtrOwner<IVolZmap> pVZM( CreateVolZmap()) ;
    bOk = bOk && ! IsNull( pVZM) ;
-   bOk = bOk && pVZM->CreateFromTriMesh( *pStm, dPrec) ;
+   bOk = bOk && pVZM->CreateFromTriMesh( *pStm, dPrec, bTriDex) ;
   // lo porto nel riferimento di destinazione
    bOk = bOk && pVZM->LocToLoc( frStm, frDest) ;
   // inserisco lo Zmap nel DB
@@ -134,7 +136,8 @@ ExeCreateVolZmapFromSurfTm( int nParentId, int nStmId, double dPrec)
    if ( IsCmdLog()) {
       string sLua = "EgtVolZmapFromTriMesh(" + IdToString( nParentId) + "," +
                                                ToString( nStmId) + "," +
-                                               ToString( dPrec) + ")" +
+                                               ToString( dPrec) + "," +
+                                               ( bTriDex ? "true" : "false") + ")" +
                     " -- Id=" + ToString( nNewId) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
    }
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index f12ccc5..e165c1a 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbCreateVol.cpp b/LUA_GdbCreateVol.cpp
index b64cc96..263dc51 100644
--- a/LUA_GdbCreateVol.cpp
+++ b/LUA_GdbCreateVol.cpp
@@ -24,7 +24,7 @@ using namespace std ;
 static int
 LuaCreateVolZmapBox( lua_State* L)
 {
-  // 5 o 6 parametri : ParentId, PtIni, dDimX, dDimY, dDimZ, dPrec [, nRefType]
+  // 7 o 8 parametri : ParentId, PtIni, dDimX, dDimY, dDimZ, dPrec, bTriDex [, nRefType]
    int nParentId ;
    LuaCheckParam( L, 1, nParentId)
    Point3d ptIni ;
@@ -37,11 +37,13 @@ LuaCreateVolZmapBox( lua_State* L)
    LuaCheckParam( L, 5, dDimZ)
    double dPrec ;
    LuaCheckParam( L, 6, dPrec)
+   bool bTriDex ;
+   LuaCheckParam( L, 7, bTriDex)
    int nRefType = RTY_DEFAULT ;
-   LuaGetParam( L, 7, nRefType) ;
+   LuaGetParam( L, 8, nRefType) ;
    LuaClearStack( L) ;
   // creo VZM parallelepipedo
-   int nId = ExeCreateVolZmap( nParentId, ptIni, dDimX, dDimY, dDimZ, dPrec, nRefType) ;
+   int nId = ExeCreateVolZmap( nParentId, ptIni, dDimX, dDimY, dDimZ, dPrec, bTriDex, nRefType) ;
   // restituisco il risultato
    if ( nId != GDB_ID_NULL)
       LuaSetParam( L, nId) ;
@@ -54,7 +56,7 @@ LuaCreateVolZmapBox( lua_State* L)
 static int
 LuaCreateVolZmapByRegionExtrusion( lua_State* L)
 {
-  // 4 parametri : ParentId, SfrId, dDimZ, dPrec
+  // 5 parametri : ParentId, SfrId, dDimZ, dPrec, bTriDex
    int nParentId ;
    LuaCheckParam( L, 1, nParentId)
    int nSfrId ;
@@ -63,9 +65,11 @@ LuaCreateVolZmapByRegionExtrusion( lua_State* L)
    LuaCheckParam( L, 3, dDimZ)
    double dPrec ;
    LuaCheckParam( L, 4, dPrec)
+   bool bTriDex ;
+   LuaCheckParam( L, 5, bTriDex)
    LuaClearStack( L) ;
   // creo VZM per estrusione di flat region
-   int nId = ExeCreateVolZmapByRegionExtrusion( nParentId, nSfrId, dDimZ, dPrec) ;
+   int nId = ExeCreateVolZmapByRegionExtrusion( nParentId, nSfrId, dDimZ, dPrec, bTriDex) ;
   // restituisco il risultato
    if ( nId != GDB_ID_NULL)
       LuaSetParam( L, nId) ;
@@ -78,16 +82,18 @@ LuaCreateVolZmapByRegionExtrusion( lua_State* L)
 static int
 LuaCreateVolZmapFromSurfTm( lua_State* L)
 {
-  // 4 parametri : ParentId, StmId, dPrec
+  // 4 parametri : ParentId, StmId, dPrec, bTriDex
    int nParentId ;
    LuaCheckParam( L, 1, nParentId)
    int nStmId ;
    LuaCheckParam( L, 2, nStmId)
    double dPrec ;
    LuaCheckParam( L, 3, dPrec)
+   bool bTriDex ;
+   LuaCheckParam( L, 4, bTriDex)
    LuaClearStack( L) ;
   // creo VZM da superficie trimesh 
-   int nId = ExeCreateVolZmapFromSurfTm( nParentId, nStmId, dPrec) ;
+   int nId = ExeCreateVolZmapFromSurfTm( nParentId, nStmId, dPrec, bTriDex) ;
   // restituisco il risultato
    if ( nId != GDB_ID_NULL)
       LuaSetParam( L, nId) ;