rdecay01/src/DetectorConstruction.cc

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0025 //
0026 /// \file DetectorConstruction.cc
0027 /// \brief Implementation of the DetectorConstruction class
0028
0029 #include "DetectorConstruction.hh"
0030
0031 #include "G4Box.hh"
0032 #include "G4LogicalVolume.hh"
0033 #include "G4NistManager.hh"
0034 #include "G4PVPlacement.hh"
0035 #include "G4SystemOfUnits.hh"
0036
0037 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0038
0039 DetectorConstruction::DetectorConstruction()
0040 {
0041   fWorldSize = 20 * mm;
0042 }
0043
0044 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0045
0046 G4VPhysicalVolume* DetectorConstruction::Construct()
0047 {
0048   //
0049   // define a material
0050   //
0051   G4Material* Air = G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR");
0052
0053   //
0054   // World
0055   //
0056   G4Box* solidWorld = new G4Box("World",  // its name
0057                                 fWorldSize / 2, fWorldSize / 2, fWorldSize / 2);  // its size
0058
0059   G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld,  // its solid
0060                                                     Air,  // its material
0061                                                     "World");  // its name
0062   G4VPhysicalVolume* physiWorld = new G4PVPlacement(0,  // no rotation
0063                                                     G4ThreeVector(),  // at (0,0,0)
0064                                                     logicWorld,  // its logical volume
0065                                                     "World",  // its name
0066                                                     0,  // its mother  volume
0067                                                     false,  // no boolean operation
0068                                                     0);  // copy number
0069
0070   //
0071   // always return the physical World
0072   //
0073   return physiWorld;
0074 }
0075
0076 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......