G4BrentLocator.hh

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// Class G4BrentLocator
//
// class description:
// 
// Implementing the calculation of the intersection point with a boundary when
// PropagationInField is used. Second order locator based on Brent Method
// for finding the intersection point by means of a 'depth' algorithm in case
// of slow progress (intersection is not found after 100 trials).
 
// History:
// -------
// 27.10.08 - Tatiana Nikitina: First implementation using
//                              LocateIntersectionPoint() from 
//                              G4PropagatorInField class
// ---------------------------------------------------------------------------
 
#ifndef G4BRENTLOCATOR_HH
#define G4BRENTLOCATOR_HH
 
#include "G4VIntersectionLocator.hh"
 
class G4BrentLocator : public G4VIntersectionLocator
{
  public:  // with description 
 
    G4BrentLocator(G4Navigator *theNavigator);
      // Constructor
    ~G4BrentLocator() override;
      // Default destructor
 
    G4bool EstimateIntersectionPoint( 
         const  G4FieldTrack&       curveStartPointTangent,           // A
         const  G4FieldTrack&       curveEndPointTangent,             // B
         const  G4ThreeVector&      trialPoint,                       // E
                G4FieldTrack&       intersectPointTangent,            // Output
                G4bool&             recalculatedEndPoint,             // Out
                G4double&           fPreviousSafety,                  // In/Out
                G4ThreeVector&      fPreviousSftOrigin) override;     // In/Out
      // If such an intersection exists, this function calculates the
      // intersection point of the true path of the particle with the surface
      // of the current volume (or of one of its daughters). 
      // Should use lateral displacement as measure of convergence
 
  private:
 
    static const G4int max_depth = 4;
    G4FieldTrack* ptrInterMedFT[max_depth+1];
      // Used to store intermediate tracks values in case of too slow progress
};
 
#endif