examples/advanced/dnaphysics/src/DetectorConstruction.cc

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//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software 
// shall cite the following Geant4-DNA collaboration publication:
// Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
//

#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"
#include "G4SystemOfUnits.hh"
#include "G4UserLimits.hh"
#include "G4NistManager.hh"
#include "G4RunManager.hh"

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DetectorConstruction::DetectorConstruction()
:fPhysiWorld(NULL), fLogicWorld(NULL), fSolidWorld(NULL)
{
  // create commands for interactive definition of the detector  
  fDetectorMessenger = new DetectorMessenger(this);
}  

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DetectorConstruction::~DetectorConstruction()
{
  delete fDetectorMessenger;
}

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G4VPhysicalVolume* DetectorConstruction::Construct()

{
  DefineMaterials();
  return ConstructDetector();
}

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void DetectorConstruction::DefineMaterials()
{ 

  // Water is defined from NIST material database
  G4NistManager * man = G4NistManager::Instance();

  G4Material * H2O = man->FindOrBuildMaterial("G4_WATER");
  
  // If one wishes to test other density value for water material, one should use instead:
  // G4Material * H2O = man->BuildMaterialWithNewDensity("G4_WATER_MODIFIED","G4_WATER",1.100*g/cm3);
  
  // Note: any string for "G4_WATER_MODIFIED" parameter is accepted
  // and "G4_WATER" parameter should not be changed
  // Both materials are created and can be selected from dna.mac

  fWaterMaterial = H2O;
  
  //G4cout << "-> Density of water material (g/cm3)=" << fWaterMaterial->GetDensity()/(g/cm/cm/cm) << G4endl;
  
  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructDetector()
{

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  // WORLD VOLUME
  
  fWorldSizeX  = 100*micrometer; 
  fWorldSizeY  = fWorldSizeX; 
  fWorldSizeZ  = fWorldSizeX;

  fSolidWorld = new G4Box("World",                   //its name
               fWorldSizeX/2,fWorldSizeY/2,fWorldSizeZ/2);  //its size
  

  fLogicWorld = new G4LogicalVolume(fSolidWorld,        //its solid
                    fWaterMaterial, //its material
                    "World");       //its name
  
  fPhysiWorld = new G4PVPlacement(0,            //no rotation
                 G4ThreeVector(),   //at (0,0,0)
                                 "World",       //its name
                                 fLogicWorld,       //its logical volume
                                 0,         //its mother  volume
                                 false,         //no boolean operation
                                 0);            //copy number


  // Visualization attributes
  G4VisAttributes* worldVisAtt= new G4VisAttributes(G4Colour(1.0,1.0,1.0)); //White
  worldVisAtt->SetVisibility(true);
  fLogicWorld->SetVisAttributes(worldVisAtt);

  G4VisAttributes* worldVisAtt1 = new G4VisAttributes(G4Colour(1.0,0.0,0.0)); 
  worldVisAtt1->SetVisibility(true);
  
  // 
  
  // Shows how to introduce a 20 eV tracking cut
  //fLogicWorld->SetUserLimits(new G4UserLimits(DBL_MAX,DBL_MAX,DBL_MAX,20*eV));

  return fPhysiWorld;
}

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void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  // Search the material by its name   
  G4Material* pttoMaterial =
    G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
  
  if (pttoMaterial) 
  {
    fWaterMaterial = pttoMaterial;
    fLogicWorld->SetMaterial(fWaterMaterial);
    G4RunManager::GetRunManager()->PhysicsHasBeenModified();
  }
}

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void DetectorConstruction::UpdateGeometry()
{
  G4RunManager::GetRunManager()->PhysicsHasBeenModified();
  G4RunManager::GetRunManager()->DefineWorldVolume(ConstructDetector());
}