DetectorConstruction.cc

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// -------------------------------------------------------------------
// $Id$
// -------------------------------------------------------------------

#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"
#include "G4SystemOfUnits.hh"
#include "G4Region.hh"
#include "G4ProductionCuts.hh"
#include "G4UserLimits.hh"
#include "G4NistManager.hh"
#include "G4RunManager.hh"

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DetectorConstruction::DetectorConstruction()
:physiWorld(NULL), logicWorld(NULL), solidWorld(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",1000*g/cm/cm/cm);
  
  // 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

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

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G4VPhysicalVolume* DetectorConstruction::ConstructDetector()
{

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  // WORLD VOLUME
  
  WorldSizeX  = 100*micrometer; 
  WorldSizeY  = WorldSizeX; 
  WorldSizeZ  = WorldSizeX;

  solidWorld = new G4Box("World",                    //its name
               WorldSizeX/2,WorldSizeY/2,WorldSizeZ/2);  //its size
  

  logicWorld = new G4LogicalVolume(solidWorld,          //its solid
                   waterMaterial,   //its material
                   "World");        //its name
  
  physiWorld = new G4PVPlacement(0,         //no rotation
                 G4ThreeVector(),   //at (0,0,0)
                                 "World",       //its name
                                 logicWorld,        //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);
  logicWorld->SetVisAttributes(worldVisAtt);

  G4VisAttributes* worldVisAtt1 = new G4VisAttributes(G4Colour(1.0,0.0,0.0)); 
  worldVisAtt1->SetVisibility(true);
  
  // 
  
  //logicWorld->SetUserLimits(new G4UserLimits(DBL_MAX,DBL_MAX,DBL_MAX,20*eV));

  return physiWorld;
}

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

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