| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | // $Id: G4SimpleLocator.cc,v 1.5 2008/12/11 10:27:58 tnikitin Exp $
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| 27 | // GEANT4 tag $Name: geant4-09-03 $
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| 28 | //
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| 29 | // Class G4SimpleLocator implementation
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| 30 | //
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| 31 | // 27.10.08 - Tatiana Nikitina.
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| 32 | // ---------------------------------------------------------------------------
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| 33 |
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| 34 | #include <iomanip>
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| 35 |
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| 36 | #include "G4ios.hh"
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| 37 | #include "G4SimpleLocator.hh"
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| 38 |
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| 39 | G4SimpleLocator::G4SimpleLocator(G4Navigator *theNavigator)
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| 40 | : G4VIntersectionLocator(theNavigator)
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| 41 | {
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| 42 | }
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| 43 |
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| 44 | G4SimpleLocator::~G4SimpleLocator()
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| 45 | {
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| 46 | }
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| 47 |
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| 48 | // --------------------------------------------------------------------------
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| 49 | // G4bool G4PropagatorInField::LocateIntersectionPoint(
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| 50 | // const G4FieldTrack& CurveStartPointVelocity, // A
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| 51 | // const G4FieldTrack& CurveEndPointVelocity, // B
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| 52 | // const G4ThreeVector& TrialPoint, // E
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| 53 | // G4FieldTrack& IntersectedOrRecalculated // Output
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| 54 | // G4bool& recalculated ) // Out
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| 55 | // --------------------------------------------------------------------------
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| 56 | //
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| 57 | // Function that returns the intersection of the true path with the surface
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| 58 | // of the current volume (either the external one or the inner one with one
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| 59 | // of the daughters:
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| 60 | //
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| 61 | // A = Initial point
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| 62 | // B = another point
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| 63 | //
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| 64 | // Both A and B are assumed to be on the true path:
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| 65 | //
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| 66 | // E is the first point of intersection of the chord AB with
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| 67 | // a volume other than A (on the surface of A or of a daughter)
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| 68 | //
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| 69 | // Convention of Use :
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| 70 | // i) If it returns "true", then IntersectionPointVelocity is set
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| 71 | // to the approximate intersection point.
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| 72 | // ii) If it returns "false", no intersection was found.
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| 73 | // The validity of IntersectedOrRecalculated depends on 'recalculated'
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| 74 | // a) if latter is false, then IntersectedOrRecalculated is invalid.
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| 75 | // b) if latter is true, then IntersectedOrRecalculated is
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| 76 | // the new endpoint, due to a re-integration.
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| 77 | // --------------------------------------------------------------------------
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| 78 | // NOTE: implementation taken from G4PropagatorInField
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| 79 | //
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| 80 | G4bool G4SimpleLocator::EstimateIntersectionPoint(
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| 81 | const G4FieldTrack& CurveStartPointVelocity, // A
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| 82 | const G4FieldTrack& CurveEndPointVelocity, // B
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| 83 | const G4ThreeVector& TrialPoint, // E
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| 84 | G4FieldTrack& IntersectedOrRecalculatedFT, // Output
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| 85 | G4bool& recalculatedEndPoint, // Out
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| 86 | G4double &fPreviousSafety, //In/Out
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| 87 | G4ThreeVector &fPreviousSftOrigin) //In/Out
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| 88 | {
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| 89 | // Find Intersection Point ( A, B, E ) of true path AB - start at E.
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| 90 |
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| 91 | G4bool found_approximate_intersection = false;
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| 92 | G4bool there_is_no_intersection = false;
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| 93 |
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| 94 | G4FieldTrack CurrentA_PointVelocity = CurveStartPointVelocity;
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| 95 | G4FieldTrack CurrentB_PointVelocity = CurveEndPointVelocity;
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| 96 | G4ThreeVector CurrentE_Point = TrialPoint;
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| 97 | G4FieldTrack ApproxIntersecPointV(CurveEndPointVelocity); // FT-Def-Construct
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| 98 | G4double NewSafety = 0.0;
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| 99 | G4bool last_AF_intersection = false;
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| 100 | G4bool final_section = true; // Shows whether current section is last
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| 101 | // (i.e. B=full end)
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| 102 | recalculatedEndPoint = false;
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| 103 |
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| 104 | G4bool restoredFullEndpoint = false;
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| 105 |
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| 106 | G4int substep_no = 0;
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| 107 |
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| 108 | // Limits for substep number
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| 109 | //
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| 110 | const G4int max_substeps = 100000000; // Test 120 (old value 100 )
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| 111 | const G4int warn_substeps = 1000; // 100
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| 112 |
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| 113 | // Statistics for substeps
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| 114 | //
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| 115 | static G4int max_no_seen= -1;
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| 116 | static G4int trigger_substepno_print= warn_substeps - 20;
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| 117 |
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| 118 | #ifdef G4DEBUG_FIELD
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| 119 | static G4double tolerance= 1.0e-8;
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| 120 | G4ThreeVector StartPosition= CurveStartPointVelocity.GetPosition();
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| 121 | if( (TrialPoint - StartPosition).mag() < tolerance * mm )
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| 122 | {
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| 123 | G4cerr << "WARNING - G4SimpleLocator::EstimateIntersectionPoint()"
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| 124 | << G4endl
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| 125 | << " Intermediate F point is on top of starting point A."
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| 126 | << G4endl;
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| 127 | G4Exception("G4SimpleLocator::EstimateIntersectionPoint()",
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| 128 | "IntersectionPointIsAtStart", JustWarning,
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| 129 | "Intersection point F is exactly at start point A." );
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| 130 | }
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| 131 | #endif
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| 132 |
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| 133 | do
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| 134 | {
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| 135 | G4ThreeVector Point_A = CurrentA_PointVelocity.GetPosition();
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| 136 | G4ThreeVector Point_B = CurrentB_PointVelocity.GetPosition();
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| 137 |
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| 138 | // F = a point on true AB path close to point E
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| 139 | // (the closest if possible)
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| 140 | //
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| 141 | ApproxIntersecPointV = GetChordFinderFor()
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| 142 | ->ApproxCurvePointV( CurrentA_PointVelocity,
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| 143 | CurrentB_PointVelocity,
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| 144 | CurrentE_Point,
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| 145 | GetEpsilonStepFor());
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| 146 | // The above method is the key & most intuitive part ...
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| 147 |
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| 148 | #ifdef G4DEBUG_FIELD
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| 149 | if( ApproxIntersecPointV.GetCurveLength() >
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| 150 | CurrentB_PointVelocity.GetCurveLength() * (1.0 + tolerance) )
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| 151 | {
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| 152 | G4cerr << "ERROR - G4SimpleLocator::EstimateIntersectionPoint()"
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| 153 | << G4endl
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| 154 | << " Intermediate F point is more advanced than"
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| 155 | << " endpoint B." << G4endl;
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| 156 | G4Exception("G4SimpleLocator::EstimateIntersectionPoint()",
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| 157 | "IntermediatePointConfusion", FatalException,
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| 158 | "Intermediate F point is past end B point" );
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| 159 | }
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| 160 | #endif
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| 161 |
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| 162 | G4ThreeVector CurrentF_Point= ApproxIntersecPointV.GetPosition();
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| 163 |
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| 164 | // First check whether EF is small - then F is a good approx. point
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| 165 | // Calculate the length and direction of the chord AF
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| 166 | //
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| 167 | G4ThreeVector ChordEF_Vector = CurrentF_Point - CurrentE_Point;
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| 168 |
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| 169 | if ( ChordEF_Vector.mag2() <= sqr(GetDeltaIntersectionFor()) )
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| 170 | {
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| 171 | found_approximate_intersection = true;
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| 172 |
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| 173 | // Create the "point" return value
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| 174 | //
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| 175 |
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| 176 | IntersectedOrRecalculatedFT = ApproxIntersecPointV;
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| 177 | IntersectedOrRecalculatedFT.SetPosition( CurrentE_Point );
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| 178 |
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| 179 | if ( GetAdjustementOfFoundIntersection() )
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| 180 | {
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| 181 | // Try to Get Correction of IntersectionPoint using SurfaceNormal()
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| 182 | //
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| 183 | G4ThreeVector IP;
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| 184 | G4ThreeVector MomentumDir= ApproxIntersecPointV.GetMomentumDirection();
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| 185 | G4bool goodCorrection = AdjustmentOfFoundIntersection( Point_A,
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| 186 | CurrentE_Point, CurrentF_Point, MomentumDir,
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| 187 | last_AF_intersection, IP, NewSafety,
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| 188 | fPreviousSafety, fPreviousSftOrigin );
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| 189 |
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| 190 | if(goodCorrection)
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| 191 | {
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| 192 | IntersectedOrRecalculatedFT = ApproxIntersecPointV;
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| 193 | IntersectedOrRecalculatedFT.SetPosition(IP);
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| 194 | }
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| 195 | }
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| 196 |
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| 197 | // Note: in order to return a point on the boundary,
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| 198 | // we must return E. But it is F on the curve.
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| 199 | // So we must "cheat": we are using the position at point E
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| 200 | // and the velocity at point F !!!
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| 201 | //
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| 202 | // This must limit the length we can allow for displacement!
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| 203 | }
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| 204 | else // E is NOT close enough to the curve (ie point F)
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| 205 | {
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| 206 | // Check whether any volumes are encountered by the chord AF
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| 207 | // ---------------------------------------------------------
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| 208 | // First relocate to restore any Voxel etc information
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| 209 | // in the Navigator before calling ComputeStep()
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| 210 | //
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| 211 | GetNavigatorFor()->LocateGlobalPointWithinVolume( Point_A );
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| 212 |
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| 213 | G4ThreeVector PointG; // Candidate intersection point
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| 214 | G4double stepLengthAF;
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| 215 | G4bool Intersects_AF = IntersectChord( Point_A, CurrentF_Point,
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| 216 | NewSafety,fPreviousSafety,
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| 217 | fPreviousSftOrigin,
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| 218 | stepLengthAF,
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| 219 | PointG );
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| 220 | last_AF_intersection = Intersects_AF;
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| 221 | if( Intersects_AF )
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| 222 | {
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| 223 | // G is our new Candidate for the intersection point.
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| 224 | // It replaces "E" and we will repeat the test to see if
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| 225 | // it is a good enough approximate point for us.
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| 226 | // B <- F
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| 227 | // E <- G
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| 228 |
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| 229 | CurrentB_PointVelocity = ApproxIntersecPointV;
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| 230 | CurrentE_Point = PointG;
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| 231 |
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| 232 | // By moving point B, must take care if current
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| 233 | // AF has no intersection to try current FB!!
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| 234 | //
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| 235 | final_section= false;
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| 236 |
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| 237 | #ifdef G4VERBOSE
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| 238 | if( fVerboseLevel > 3 )
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| 239 | {
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| 240 | G4cout << "G4PiF::LI> Investigating intermediate point"
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| 241 | << " at s=" << ApproxIntersecPointV.GetCurveLength()
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| 242 | << " on way to full s="
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| 243 | << CurveEndPointVelocity.GetCurveLength() << G4endl;
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| 244 | }
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| 245 | #endif
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| 246 | }
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| 247 | else // not Intersects_AF
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| 248 | {
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| 249 | // In this case:
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| 250 | // There is NO intersection of AF with a volume boundary.
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| 251 | // We must continue the search in the segment FB!
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| 252 | //
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| 253 | GetNavigatorFor()->LocateGlobalPointWithinVolume( CurrentF_Point );
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| 254 |
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| 255 | G4double stepLengthFB;
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| 256 | G4ThreeVector PointH;
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| 257 |
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| 258 | // Check whether any volumes are encountered by the chord FB
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| 259 | // ---------------------------------------------------------
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| 260 |
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| 261 | G4bool Intersects_FB = IntersectChord( CurrentF_Point, Point_B,
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| 262 | NewSafety,fPreviousSafety,
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| 263 | fPreviousSftOrigin,
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| 264 | stepLengthFB,
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| 265 | PointH );
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| 266 | if( Intersects_FB )
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| 267 | {
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| 268 | // There is an intersection of FB with a volume boundary
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| 269 | // H <- First Intersection of Chord FB
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| 270 |
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| 271 | // H is our new Candidate for the intersection point.
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| 272 | // It replaces "E" and we will repeat the test to see if
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| 273 | // it is a good enough approximate point for us.
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| 274 |
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| 275 | // Note that F must be in volume volA (the same as A)
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| 276 | // (otherwise AF would meet a volume boundary!)
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| 277 | // A <- F
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| 278 | // E <- H
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| 279 | //
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| 280 | CurrentA_PointVelocity = ApproxIntersecPointV;
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| 281 | CurrentE_Point = PointH;
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| 282 | }
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| 283 | else // not Intersects_FB
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| 284 | {
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| 285 | // There is NO intersection of FB with a volume boundary
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| 286 |
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| 287 | if( final_section )
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| 288 | {
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| 289 | // If B is the original endpoint, this means that whatever
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| 290 | // volume(s) intersected the original chord, none touch the
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| 291 | // smaller chords we have used.
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| 292 | // The value of 'IntersectedOrRecalculatedFT' returned is
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| 293 | // likely not valid
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| 294 |
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| 295 | there_is_no_intersection = true; // real final_section
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| 296 | }
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| 297 | else
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| 298 | {
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| 299 | // We must restore the original endpoint
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| 300 |
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| 301 | CurrentA_PointVelocity = CurrentB_PointVelocity; // Got to B
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| 302 | CurrentB_PointVelocity = CurveEndPointVelocity;
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| 303 | restoredFullEndpoint = true;
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| 304 | }
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| 305 | } // Endif (Intersects_FB)
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| 306 | } // Endif (Intersects_AF)
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| 307 |
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| 308 | // Ensure that the new endpoints are not further apart in space
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| 309 | // than on the curve due to different errors in the integration
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| 310 | //
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| 311 | G4double linDistSq, curveDist;
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| 312 | linDistSq = ( CurrentB_PointVelocity.GetPosition()
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| 313 | - CurrentA_PointVelocity.GetPosition() ).mag2();
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| 314 | curveDist = CurrentB_PointVelocity.GetCurveLength()
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| 315 | - CurrentA_PointVelocity.GetCurveLength();
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| 316 |
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| 317 | // Change this condition for very strict parameters of propagation
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| 318 | //
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| 319 | if( curveDist*curveDist*(1+2* GetEpsilonStepFor()) < linDistSq )
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| 320 | {
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| 321 | // Re-integrate to obtain a new B
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| 322 | //
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| 323 | G4FieldTrack newEndPointFT =
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| 324 | ReEstimateEndpoint( CurrentA_PointVelocity,
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| 325 | CurrentB_PointVelocity,
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| 326 | linDistSq, // to avoid recalculation
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| 327 | curveDist );
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| 328 | G4FieldTrack oldPointVelB = CurrentB_PointVelocity;
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| 329 | CurrentB_PointVelocity = newEndPointFT;
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| 330 |
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| 331 | if( (final_section)) // real final section
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| 332 | {
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| 333 | recalculatedEndPoint = true;
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| 334 | IntersectedOrRecalculatedFT = newEndPointFT;
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| 335 | // So that we can return it, if it is the endpoint!
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| 336 | }
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| 337 | }
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| 338 | if( curveDist < 0.0 )
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| 339 | {
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| 340 | G4cerr << "ERROR - G4SimpleLocator::EstimateIntersectionPoint()"
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| 341 | << G4endl
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| 342 | << " Error in advancing propagation." << G4endl;
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| 343 | fVerboseLevel = 5; // Print out a maximum of information
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| 344 | printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
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| 345 | -1.0, NewSafety, substep_no );
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| 346 | G4cerr << " Point A (start) is " << CurrentA_PointVelocity
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| 347 | << G4endl;
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| 348 | G4cerr << " Point B (end) is " << CurrentB_PointVelocity
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| 349 | << G4endl;
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| 350 | G4cerr << " Curve distance is " << curveDist << G4endl;
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| 351 | G4cerr << G4endl
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| 352 | << "The final curve point is not further along"
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| 353 | << " than the original!" << G4endl;
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| 354 |
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| 355 | if( recalculatedEndPoint )
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| 356 | {
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| 357 | G4cerr << "Recalculation of EndPoint was called with fEpsStep= "
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| 358 | << GetEpsilonStepFor() << G4endl;
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| 359 | }
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| 360 | G4cerr.precision(20);
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| 361 | G4cerr << " Point A (Curve start) is " << CurveStartPointVelocity
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| 362 | << G4endl;
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| 363 | G4cerr << " Point B (Curve end) is " << CurveEndPointVelocity
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| 364 | << G4endl;
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| 365 | G4cerr << " Point A (Current start) is " << CurrentA_PointVelocity
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| 366 | << G4endl;
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| 367 | G4cerr << " Point B (Current end) is " << CurrentB_PointVelocity
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| 368 | << G4endl;
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| 369 | G4cerr << " Point E (Trial Point) is " << CurrentE_Point
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| 370 | << G4endl;
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| 371 | G4cerr << " Point F (Intersection) is " << ApproxIntersecPointV
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| 372 | << G4endl;
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| 373 | G4cerr << " LocateIntersection parameters are : Substep no= "
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| 374 | << substep_no << G4endl;
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| 375 |
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| 376 | G4Exception("G4SimpleLocator::EstimateIntersectionPoint()",
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| 377 | "FatalError", FatalException,
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| 378 | "Error in advancing propagation.");
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| 379 | }
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| 380 |
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| 381 | if(restoredFullEndpoint)
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| 382 | {
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| 383 | final_section = restoredFullEndpoint;
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| 384 | restoredFullEndpoint = false;
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| 385 | }
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| 386 | } // EndIf ( E is close enough to the curve, ie point F. )
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| 387 | // tests ChordAF_Vector.mag() <= maximum_lateral_displacement
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| 388 |
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| 389 | #ifdef G4DEBUG_LOCATE_INTERSECTION
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| 390 | if( substep_no >= trigger_substepno_print )
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| 391 | {
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| 392 | G4cout << "Difficulty in converging in "
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| 393 | << "G4SimpleLocator::EstimateIntersectionPoint():"
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| 394 | << G4endl
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| 395 | << " Substep no = " << substep_no << G4endl;
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|---|
| 396 | if( substep_no == trigger_substepno_print )
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|---|
| 397 | {
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|---|
| 398 | printStatus( CurveStartPointVelocity, CurveEndPointVelocity,
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|---|
| 399 | -1.0, NewSafety, 0);
|
|---|
| 400 | }
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|---|
| 401 | G4cout << " State of point A: ";
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|---|
| 402 | printStatus( CurrentA_PointVelocity, CurrentA_PointVelocity,
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| 403 | -1.0, NewSafety, substep_no-1, 0);
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|---|
| 404 | G4cout << " State of point B: ";
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| 405 | printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
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|---|
| 406 | -1.0, NewSafety, substep_no);
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|---|
| 407 | }
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|---|
| 408 | #endif
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|---|
| 409 | substep_no++;
|
|---|
| 410 |
|
|---|
| 411 | } while ( ( ! found_approximate_intersection )
|
|---|
| 412 | && ( ! there_is_no_intersection )
|
|---|
| 413 | && ( substep_no <= max_substeps) ); // UNTIL found or failed
|
|---|
| 414 |
|
|---|
| 415 | if( substep_no > max_no_seen )
|
|---|
| 416 | {
|
|---|
| 417 | max_no_seen = substep_no;
|
|---|
| 418 | if( max_no_seen > warn_substeps )
|
|---|
| 419 | {
|
|---|
| 420 | trigger_substepno_print = max_no_seen-20; // Want to see last 20 steps
|
|---|
| 421 | }
|
|---|
| 422 | }
|
|---|
| 423 |
|
|---|
| 424 | if( ( substep_no >= max_substeps)
|
|---|
| 425 | && !there_is_no_intersection
|
|---|
| 426 | && !found_approximate_intersection )
|
|---|
| 427 | {
|
|---|
| 428 | G4cerr << "WARNING - G4SimpleLocator::EstimateIntersectionPoint()"
|
|---|
| 429 | << G4endl
|
|---|
| 430 | << " Convergence is requiring too many substeps: "
|
|---|
| 431 | << substep_no << G4endl;
|
|---|
| 432 | G4cerr << " Abandoning effort to intersect. " << G4endl;
|
|---|
| 433 | G4cerr << " Information on start & current step follows in cout."
|
|---|
| 434 | << G4endl;
|
|---|
| 435 | G4cout << "WARNING - G4SimpleLocator::EstimateIntersectionPoint()"
|
|---|
| 436 | << G4endl
|
|---|
| 437 | << " Convergence is requiring too many substeps: "
|
|---|
| 438 | << substep_no << G4endl;
|
|---|
| 439 | G4cout << " Found intersection = "
|
|---|
| 440 | << found_approximate_intersection << G4endl
|
|---|
| 441 | << " Intersection exists = "
|
|---|
| 442 | << !there_is_no_intersection << G4endl;
|
|---|
| 443 | G4cout << " Start and Endpoint of Requested Step:" << G4endl;
|
|---|
| 444 | printStatus( CurveStartPointVelocity, CurveEndPointVelocity,
|
|---|
| 445 | -1.0, NewSafety, 0);
|
|---|
| 446 | G4cout << G4endl;
|
|---|
| 447 | G4cout << " 'Bracketing' starting and endpoint of current Sub-Step"
|
|---|
| 448 | << G4endl;
|
|---|
| 449 | printStatus( CurrentA_PointVelocity, CurrentA_PointVelocity,
|
|---|
| 450 | -1.0, NewSafety, substep_no-1);
|
|---|
| 451 | printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
|
|---|
| 452 | -1.0, NewSafety, substep_no);
|
|---|
| 453 | G4cout << G4endl;
|
|---|
| 454 | G4cout.precision( 10 );
|
|---|
| 455 | G4double done_len = CurrentA_PointVelocity.GetCurveLength();
|
|---|
| 456 | G4double full_len = CurveEndPointVelocity.GetCurveLength();
|
|---|
| 457 | G4cout << "ERROR - G4SimpleLocator::EstimateIntersectionPoint()"
|
|---|
| 458 | << G4endl
|
|---|
| 459 | << " Undertaken only length: " << done_len
|
|---|
| 460 | << " out of " << full_len << " required." << G4endl;
|
|---|
| 461 | G4cout << " Remaining length = " << full_len - done_len << G4endl;
|
|---|
| 462 |
|
|---|
| 463 | G4Exception("G4SimpleLocator::EstimateIntersectionPoint()",
|
|---|
| 464 | "UnableToLocateIntersection", FatalException,
|
|---|
| 465 | "Too many substeps while trying to locate intersection.");
|
|---|
| 466 | }
|
|---|
| 467 | else if( substep_no >= warn_substeps )
|
|---|
| 468 | {
|
|---|
| 469 | G4int oldprc= G4cout.precision( 10 );
|
|---|
| 470 | G4cout << "WARNING - G4SimpleLocator::EstimateIntersectionPoint()"
|
|---|
| 471 | << G4endl
|
|---|
| 472 | << " Undertaken length: "
|
|---|
| 473 | << CurrentB_PointVelocity.GetCurveLength();
|
|---|
| 474 | G4cout << " - Needed: " << substep_no << " substeps." << G4endl
|
|---|
| 475 | << " Warning level = " << warn_substeps
|
|---|
| 476 | << " and maximum substeps = " << max_substeps << G4endl;
|
|---|
| 477 | G4Exception("G4SimpleLocator::EstimateIntersectionPoint()",
|
|---|
| 478 | "DifficultyToLocateIntersection", JustWarning,
|
|---|
| 479 | "Many substeps while trying to locate intersection.");
|
|---|
| 480 | G4cout.precision( oldprc );
|
|---|
| 481 | }
|
|---|
| 482 | return !there_is_no_intersection; // Success or failure
|
|---|
| 483 | }
|
|---|
