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1 // 2 // ******************************************************************** 3 // * License and Disclaimer * 4 // * * 5 // * The Geant4 software is copyright of the Copyright Holders of * 6 // * the Geant4 Collaboration. It is provided under the terms and * 7 // * conditions of the Geant4 Software License, included in the file * 8 // * LICENSE and available at http://cern.ch/geant4/license . These * 9 // * include a list of copyright holders. * 10 // * * 11 // * Neither the authors of this software system, nor their employing * 12 // * institutes,nor the agencies providing financial support for this * 13 // * work make any representation or warranty, express or implied, * 14 // * regarding this software system or assume any liability for its * 15 // * use. Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitation of liability. * 17 // * * 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************************************** 25 // 26 /// \file DetectorConstruction.cc 27 /// \brief Example of empty world volume. 28 // 29 // Author: G.Hugo, 06 January 2023 30 // 31 // *************************************************************************** 32 // 33 /// DetectorConstruction 34 // 35 // Example of empty world volume. 36 // 37 // *************************************************************************** 38 39 #include "DetectorConstruction.hh" 40 41 #include "G4Box.hh" 42 #include "G4LogicalVolume.hh" 43 #include "G4Material.hh" 44 #include "G4NistManager.hh" 45 #include "G4PVPlacement.hh" 46 #include "G4SystemOfUnits.hh" 47 #include "G4VPhysicalVolume.hh" 48 49 // *************************************************************************** 50 // Returns a 1-cm sided box filled with G4_Galactic. 51 // *************************************************************************** 52 G4VPhysicalVolume* DetectorConstruction::Construct() 53 { 54 G4Box* const worldSolid = new G4Box("World", 1. * CLHEP::cm, 1. * CLHEP::cm, 1. * CLHEP::cm); 55 56 G4Material* const worldMaterial = G4NistManager::Instance()->FindOrBuildMaterial("G4_Galactic"); 57 G4LogicalVolume* const worldLogicalVol = new G4LogicalVolume(worldSolid, worldMaterial, "World"); 58 // NB: G4LogicalVolumeStore owns all logical volumes. 59 60 G4VPhysicalVolume* const worldPhysicalVol = 61 new G4PVPlacement(nullptr, G4ThreeVector(), worldLogicalVol, "World", nullptr, false, 0); 62 // NB: G4PhysicalVolumeStore owns all physical volumes. 63 64 return worldPhysicalVol; 65 } 66 67 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 68