Is it really kZAxis or kXAxis? exampleN04 at two files: ExN04DetectorConstruction && ExN04CalorimeterROGeometry

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Hi all,

I just would like to point out/verify this in exampleN04. I appended below the lines I am refereing.

Question: Why not just use kXAxis? we know that the detector's common axis is the X-axis? But in the ROGeometry, it is using the Z-axis? What is really the big difference? Would this affect the result much if I just become consistent using the X-axis for both?

Please explain.

Thanks

Zaldy

BTW, am using geant4.9.1.p03 using gcc 4.3.2 at Debian 5(Lenny) Distribution

============================================================================ Inside FILENAME: ExN04CalorimeterROGeometry.cc

G4VPhysicalVolume* ExN04CalorimeterROGeometry::Build()
{
.............
.............
  // -------------------------------
  // Calorimeter readout division:
  // -------------------------------
  // Phi division first: 48 sectors
................
................
................
  G4LogicalVolume * caloROcellLog
    = new G4LogicalVolume(caloROcellTub, dummyMat, "caloROcellLogical",0,0,0);
//  G4VPhysicalVolume * caloROcellPhys =
      new G4PVReplica("caloROcellPhysical", caloROcellLog, caloROphiDivisionPhys,
		      kZAxis, segmentsinZ,2.*caloRing_dz);
                      ^^^^^^
     ==============> THIS ONE above ***************************

...........
..........
   return ROWorldPhys;
}

Inside FILENAME: ExN04DetectorConstruction

G4VPhysicalVolume* ExN04DetectorConstruction::Construct()
{
..............
  //------------------------------ calorimeter
  G4VSolid * calorimeter_tubs
..............
  //------------------------------- Lead layers
  // As an example for Parameterised volume 
  // dummy values for G4Tubs -- modified by parameterised volume
  G4VSolid * caloLayer_tubs
...............
...............
  // dummy value : kXAxis -- modified by parameterised volume
  // G4VPhysicalVolume * caloLayer_phys =
      new G4PVParameterised("caloLayer_phys",caloLayer_log,calorimeter_log,
			   kXAxis, nocaloLayers, calorimeterParam);
                          ^^^^^^^^  
         ============> THIS ONE ABOVE *************************

..............
   return experimentalHall_phys;
}