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); |
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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++; |
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410 | |
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411 | } while ( ( ! found_approximate_intersection ) |
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412 | && ( ! there_is_no_intersection ) |
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413 | && ( substep_no <= max_substeps) ); // UNTIL found or failed |
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414 | |
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415 | if( substep_no > max_no_seen ) |
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416 | { |
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417 | max_no_seen = substep_no; |
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418 | if( max_no_seen > warn_substeps ) |
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419 | { |
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420 | trigger_substepno_print = max_no_seen-20; // Want to see last 20 steps |
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421 | } |
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422 | } |
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423 | |
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424 | if( ( substep_no >= max_substeps) |
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425 | && !there_is_no_intersection |
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426 | && !found_approximate_intersection ) |
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427 | { |
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428 | G4cerr << "WARNING - G4SimpleLocator::EstimateIntersectionPoint()" |
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429 | << G4endl |
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430 | << " Convergence is requiring too many substeps: " |
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431 | << substep_no << G4endl; |
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432 | G4cerr << " Abandoning effort to intersect. " << G4endl; |
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433 | G4cerr << " Information on start & current step follows in cout." |
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434 | << G4endl; |
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435 | G4cout << "WARNING - G4SimpleLocator::EstimateIntersectionPoint()" |
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436 | << G4endl |
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437 | << " Convergence is requiring too many substeps: " |
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438 | << substep_no << G4endl; |
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439 | G4cout << " Found intersection = " |
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440 | << found_approximate_intersection << G4endl |
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441 | << " Intersection exists = " |
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442 | << !there_is_no_intersection << G4endl; |
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443 | G4cout << " Start and Endpoint of Requested Step:" << G4endl; |
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444 | printStatus( CurveStartPointVelocity, CurveEndPointVelocity, |
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445 | -1.0, NewSafety, 0); |
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446 | G4cout << G4endl; |
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447 | G4cout << " 'Bracketing' starting and endpoint of current Sub-Step" |
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448 | << G4endl; |
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449 | printStatus( CurrentA_PointVelocity, CurrentA_PointVelocity, |
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450 | -1.0, NewSafety, substep_no-1); |
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451 | printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity, |
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452 | -1.0, NewSafety, substep_no); |
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453 | G4cout << G4endl; |
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454 | G4cout.precision( 10 ); |
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455 | G4double done_len = CurrentA_PointVelocity.GetCurveLength(); |
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456 | G4double full_len = CurveEndPointVelocity.GetCurveLength(); |
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457 | G4cout << "ERROR - G4SimpleLocator::EstimateIntersectionPoint()" |
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458 | << G4endl |
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459 | << " Undertaken only length: " << done_len |
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460 | << " out of " << full_len << " required." << G4endl; |
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461 | G4cout << " Remaining length = " << full_len - done_len << G4endl; |
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462 | |
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463 | G4Exception("G4SimpleLocator::EstimateIntersectionPoint()", |
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464 | "UnableToLocateIntersection", FatalException, |
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465 | "Too many substeps while trying to locate intersection."); |
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466 | } |
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467 | else if( substep_no >= warn_substeps ) |
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468 | { |
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469 | G4int oldprc= G4cout.precision( 10 ); |
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470 | G4cout << "WARNING - G4SimpleLocator::EstimateIntersectionPoint()" |
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471 | << G4endl |
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472 | << " Undertaken length: " |
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473 | << CurrentB_PointVelocity.GetCurveLength(); |
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474 | G4cout << " - Needed: " << substep_no << " substeps." << G4endl |
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475 | << " Warning level = " << warn_substeps |
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476 | << " and maximum substeps = " << max_substeps << G4endl; |
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477 | G4Exception("G4SimpleLocator::EstimateIntersectionPoint()", |
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478 | "DifficultyToLocateIntersection", JustWarning, |
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479 | "Many substeps while trying to locate intersection."); |
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480 | G4cout.precision( oldprc ); |
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481 | } |
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482 | return !there_is_no_intersection; // Success or failure |
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483 | } |
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