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//
///  \file DetectorConstruction.cc
///  \brief Example of empty world volume.
//
//  Author: G.Hugo, 06 January 2023
//
// ***************************************************************************
//
///      DetectorConstruction
//
//  Example of empty world volume.
//
// ***************************************************************************

#include "DetectorConstruction.hh"

#include "G4Box.hh"
#include "G4NistManager.hh"
#include "G4Material.hh"
#include "G4LogicalVolume.hh"
#include "G4VPhysicalVolume.hh"
#include "G4PVPlacement.hh"

#include "G4SystemOfUnits.hh"


// ***************************************************************************
// Returns a 1-cm sided box filled with G4_Galactic.
// ***************************************************************************
G4VPhysicalVolume* DetectorConstruction::Construct() {

  
  G4Box* const worldSolid = new G4Box("World", 1.*CLHEP::cm, 1.*CLHEP::cm, 1.*CLHEP::cm);

  G4Material* const worldMaterial = G4NistManager::Instance()->FindOrBuildMaterial("G4_Galactic");
  G4LogicalVolume* const worldLogicalVol = new G4LogicalVolume(worldSolid, worldMaterial, "World");
  // NB: G4LogicalVolumeStore owns all logical volumes.

  G4VPhysicalVolume* const worldPhysicalVol  = new G4PVPlacement(nullptr, 
                                                              G4ThreeVector(),
                                                              worldLogicalVol, 
                                                              "World", 
                                                              nullptr, 
                                                              false, 
                                                              0);
  // NB: G4PhysicalVolumeStore owns all physical volumes.

  return worldPhysicalVol;
}

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