1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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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: G4SafetyHelper.cc,v 1.15 2007/11/14 10:04:21 gcosmo Exp $ |
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27 | // GEANT4 tag $ Name: $ |
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28 | // |
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29 | // class G4SafetyHelper Implementation |
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30 | // |
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31 | // Original author: John Apostolakis, 2006 |
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32 | // |
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33 | // -------------------------------------------------------------------- |
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34 | |
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35 | #include "G4SafetyHelper.hh" |
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36 | #include "G4PathFinder.hh" |
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37 | #include "G4TransportationManager.hh" |
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38 | #include "G4Navigator.hh" |
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39 | |
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40 | #include "globals.hh" |
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41 | |
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42 | G4SafetyHelper::G4SafetyHelper() |
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43 | : fUseParallelGeometries(false), // By default, one geometry only |
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44 | fFirstCall(true), |
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45 | fLastSafetyPosition(0.0,0.0,0.0), |
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46 | fLastSafety(0.0), |
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47 | fRecomputeFactor(0.0) |
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48 | { |
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49 | fpPathFinder= 0; // Cannot initialise this yet - a loop results |
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50 | |
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51 | // Initialization of the Navigator pointer is postponed, and must |
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52 | // be undertaken by another class calling InitialiseHelper() |
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53 | // |
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54 | fpMassNavigator= 0; |
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55 | fMassNavigatorId= -1; |
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56 | } |
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57 | |
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58 | void G4SafetyHelper::InitialiseNavigator() |
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59 | { |
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60 | fpPathFinder= G4PathFinder::GetInstance(); |
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61 | |
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62 | G4TransportationManager* pTransportMgr= |
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63 | G4TransportationManager::GetTransportationManager(); |
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64 | |
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65 | fpMassNavigator = pTransportMgr->GetNavigatorForTracking(); |
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66 | |
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67 | // Check |
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68 | // |
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69 | G4VPhysicalVolume* worldPV = fpMassNavigator->GetWorldVolume(); |
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70 | if( worldPV == 0 ) |
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71 | { |
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72 | G4Exception("G4SafetyHelper::InitialiseNavigator", |
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73 | "InvalidNavigatorWorld", FatalException, |
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74 | "Found that existing tracking Navigator has NULL world"); |
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75 | } |
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76 | |
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77 | fMassNavigatorId = pTransportMgr->ActivateNavigator( fpMassNavigator ); |
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78 | } |
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79 | |
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80 | void G4SafetyHelper::InitialiseHelper() |
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81 | { |
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82 | fLastSafetyPosition = G4ThreeVector(0.0,0.0,0.0); |
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83 | fLastSafety = 0.0; |
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84 | if (fFirstCall) { InitialiseNavigator(); } |
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85 | fFirstCall = false; |
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86 | } |
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87 | |
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88 | G4SafetyHelper::~G4SafetyHelper() |
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89 | { |
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90 | } |
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91 | |
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92 | G4double |
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93 | G4SafetyHelper::CheckNextStep(const G4ThreeVector &position, |
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94 | const G4ThreeVector &direction, |
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95 | const G4double currentMaxStep, |
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96 | G4double& newSafety ) |
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97 | { |
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98 | // Distance in the Mass geometry |
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99 | // |
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100 | G4double linstep = fpMassNavigator->CheckNextStep( position, |
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101 | direction, |
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102 | currentMaxStep, |
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103 | newSafety); |
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104 | fLastSafetyPosition = position; |
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105 | fLastSafety = newSafety; |
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106 | |
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107 | // TO-DO: Can replace this with a call to PathFinder |
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108 | // giving id of Mass Geometry --> this avoid doing the work twice |
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109 | |
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110 | return linstep; |
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111 | } |
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112 | |
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113 | G4double G4SafetyHelper::ComputeSafety( const G4ThreeVector& position ) |
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114 | { |
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115 | G4double newSafety; |
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116 | |
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117 | // Only recompute (calling Navigator/PathFinder) if 'position' |
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118 | // is *not* the safety location and has moved 'significantly' |
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119 | // |
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120 | G4double moveLengthSq = (position-fLastSafetyPosition).mag2(); |
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121 | G4double safeDistance = fRecomputeFactor*fLastSafety; |
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122 | if( (moveLengthSq > 0.0 ) |
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123 | && (moveLengthSq >= safeDistance*safeDistance)) |
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124 | { |
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125 | fLastSafetyPosition = position; |
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126 | |
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127 | if( !fUseParallelGeometries ) |
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128 | { |
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129 | // Safety for mass geometry |
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130 | fLastSafety = fpMassNavigator->ComputeSafety(position); |
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131 | } |
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132 | else |
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133 | { |
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134 | // Safety for all geometries |
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135 | fLastSafety = fpPathFinder->ComputeSafety( position ); |
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136 | } |
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137 | newSafety = fLastSafety; |
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138 | } |
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139 | else |
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140 | { |
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141 | // return last value if position is not significantly changed |
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142 | // |
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143 | G4double moveLength = 0; |
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144 | if( moveLengthSq > 0.0 ) |
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145 | { |
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146 | moveLength= std::sqrt(moveLengthSq); |
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147 | } |
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148 | newSafety = fLastSafety-moveLength; |
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149 | } |
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150 | return newSafety; |
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151 | } |
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152 | |
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153 | void G4SafetyHelper::ReLocateWithinVolume( const G4ThreeVector &newPosition ) |
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154 | { |
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155 | if( !fUseParallelGeometries ) |
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156 | { |
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157 | fpMassNavigator->LocateGlobalPointWithinVolume( newPosition ); |
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158 | } |
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159 | else |
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160 | { |
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161 | fpPathFinder->ReLocate( newPosition ); |
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162 | } |
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163 | } |
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164 | |
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165 | void G4SafetyHelper::Locate( const G4ThreeVector& newPosition, |
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166 | const G4ThreeVector& newDirection) |
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167 | { |
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168 | if( !fUseParallelGeometries) |
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169 | { |
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170 | fpMassNavigator->LocateGlobalPointAndSetup(newPosition, &newDirection, |
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171 | true, false); |
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172 | } |
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173 | else |
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174 | { |
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175 | fpPathFinder->Locate( newPosition, newDirection ); |
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176 | } |
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177 | } |
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