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G4BrentLocator.hh
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27 // $Id$
28 //
29 // Class G4BrentLocator
30 //
31 // class description:
32 //
33 // Implementing the calculation of the intersection point with a boundary when
34 // PropagationInField is used. Second order locator based on Brent Method
35 // for finding the intersection point by means of a 'depth' algorithm in case
36 // of slow progress (intersection is not found after 100 trials).
37 
38 // History:
39 // -------
40 // 27.10.08 - Tatiana Nikitina: First implementation using
41 // LocateIntersectionPoint() from
42 // G4PropagatorInField class
43 // ---------------------------------------------------------------------------
44 
45 #ifndef G4BRENTLOCATOR_HH
46 #define G4BRENTLOCATOR_HH
47 
49 
51 {
52  public: // with description
53 
54  G4BrentLocator(G4Navigator *theNavigator);
55  // Constructor
57  // Default destructor
58 
60  const G4FieldTrack& curveStartPointTangent, // A
61  const G4FieldTrack& curveEndPointTangent, // B
62  const G4ThreeVector& trialPoint, // E
63  G4FieldTrack& intersectPointTangent, // Output
64  G4bool& recalculatedEndPoint, // Out
65  G4double& fPreviousSafety, // In/Out
66  G4ThreeVector& fPreviousSftOrigin); // In/Out
67  // If such an intersection exists, this function calculates the
68  // intersection point of the true path of the particle with the surface
69  // of the current volume (or of one of its daughters).
70  // Should use lateral displacement as measure of convergence
71 
72  private:
73 
74  static const G4int max_depth=4;
75  G4FieldTrack* ptrInterMedFT[max_depth+1];
76  // Used to store intermediate tracks values in case of too slow progress
77 
78  G4int maxNumberOfStepsForIntersection;
79  G4int maxNumberOfCallsToReIntegration;
80  G4int maxNumberOfCallsToReIntegration_depth;
81  // Counters for Statistics about Location and ReIntegrations
82 };
83 
84 #endif