rdecay01/src/DetectorConstruction.cc

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0025 //
0026 /// \file DetectorConstruction.cc
0027 /// \brief Implementation of the DetectorConstruction class
0028 //
0029 //
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0032
0033 #include "DetectorConstruction.hh"
0034
0035 #include "G4Box.hh"
0036 #include "G4LogicalVolume.hh"
0037 #include "G4NistManager.hh"
0038 #include "G4PVPlacement.hh"
0039 #include "G4SystemOfUnits.hh"
0040
0041 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0042
0043 DetectorConstruction::DetectorConstruction()
0044 {
0045   fWorldSize = 20 * mm;
0046 }
0047
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0049
0050 G4VPhysicalVolume* DetectorConstruction::Construct()
0051 {
0052   //
0053   // define a material
0054   //
0055   G4Material* Air = G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR");
0056
0057   //
0058   // World
0059   //
0060   G4Box* solidWorld = new G4Box("World",  // its name
0061                                 fWorldSize / 2, fWorldSize / 2, fWorldSize / 2);  // its size
0062
0063   G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld,  // its solid
0064                                                     Air,  // its material
0065                                                     "World");  // its name
0066   G4VPhysicalVolume* physiWorld = new G4PVPlacement(0,  // no rotation
0067                                                     G4ThreeVector(),  // at (0,0,0)
0068                                                     logicWorld,  // its logical volume
0069                                                     "World",  // its name
0070                                                     0,  // its mother  volume
0071                                                     false,  // no boolean operation
0072                                                     0);  // copy number
0073
0074   //
0075   // always return the physical World
0076   //
0077   return physiWorld;
0078 }
0079
0080 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......