particleGun/src/DetectorConstruction.cc

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0026 /// \file eventgenerator/particleGun/src/DetectorConstruction.cc
0027 /// \brief Implementation of the DetectorConstruction class
0028 //
0029 //
0030 //
0031 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0032 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0033
0034 #include "DetectorConstruction.hh"
0035
0036 #include "G4Box.hh"
0037 #include "G4LogicalVolume.hh"
0038 #include "G4NistManager.hh"
0039 #include "G4PVPlacement.hh"
0040 #include "G4SystemOfUnits.hh"
0041
0042 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0043
0044 DetectorConstruction::DetectorConstruction()
0045 {
0046   fWorldSizeXY = 2 * cm;
0047   fWorldSizeZ = 2 * cm;
0048 }
0049
0050 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0051
0052 G4VPhysicalVolume* DetectorConstruction::Construct()
0053 {
0054   //
0055   // define a material
0056   //
0057   G4Material* Air = G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR");
0058
0059   //
0060   // World
0061   //
0062   G4Box* solidWorld = new G4Box("World",  // its name
0063                                 fWorldSizeXY / 2, fWorldSizeXY / 2, fWorldSizeZ / 2);  // its size
0064
0065   G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld,  // its solid
0066                                                     Air,  // its material
0067                                                     "World");  // its name
0068   G4VPhysicalVolume* physiWorld = new G4PVPlacement(0,  // no rotation
0069                                                     G4ThreeVector(),  // at (0,0,0)
0070                                                     logicWorld,  // its logical volume
0071                                                     "World",  // its name
0072                                                     0,  // its mother  volume
0073                                                     false,  // no boolean operation
0074                                                     0);  // copy number
0075
0076   //
0077   // always return the physical World
0078   //
0079   return physiWorld;
0080 }
0081
0082 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......