DetectorConstruction.cc

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// 
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#include "DetectorConstruction.hh"

#include "G4NistManager.hh"
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4SystemOfUnits.hh"

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DetectorConstruction::DetectorConstruction()
 : G4VUserDetectorConstruction()
{
  fWorldSize = 20*mm;
}

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DetectorConstruction::~DetectorConstruction()
{}

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  //
  // define a material
  //   
  G4Material* Air =
  G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR"); 
  
  //     
  // World
  //
  G4Box*  
  solidWorld = new G4Box("World",                          //its name
                   fWorldSize/2,fWorldSize/2,fWorldSize/2);//its size
                   
  G4LogicalVolume*                         
  logicWorld = new G4LogicalVolume(solidWorld,             //its solid
                                   Air,                    //its material
                                   "World");               //its name
  G4VPhysicalVolume*                                   
  physiWorld = new G4PVPlacement(0,                      //no rotation
                                 G4ThreeVector(),        //at (0,0,0)
                                 logicWorld,             //its logical volume
                                 "World",                //its name
                                 0,                      //its mother  volume
                                 false,                  //no boolean operation
                                 0);                     //copy number
                
  //
  //always return the physical World
  //  
  return physiWorld;
}

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