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 | //////////////////////////////////////////////////////////////////////// |
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27 | // Optical Photon Boundary Process Class Implementation |
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28 | //////////////////////////////////////////////////////////////////////// |
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29 | // |
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30 | // File: G4OpBoundaryProcess.cc |
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31 | // Description: Discrete Process -- reflection/refraction at |
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32 | // optical interfaces |
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33 | // Version: 1.1 |
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34 | // Created: 1997-06-18 |
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35 | // Modified: 1998-05-25 - Correct parallel component of polarization |
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36 | // (thanks to: Stefano Magni + Giovanni Pieri) |
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37 | // 1998-05-28 - NULL Rindex pointer before reuse |
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38 | // (thanks to: Stefano Magni) |
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39 | // 1998-06-11 - delete *sint1 in oblique reflection |
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40 | // (thanks to: Giovanni Pieri) |
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41 | // 1998-06-19 - move from GetLocalExitNormal() to the new |
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42 | // method: GetLocalExitNormal(&valid) to get |
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43 | // the surface normal in all cases |
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44 | // 1998-11-07 - NULL OpticalSurface pointer before use |
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45 | // comparison not sharp for: std::abs(cost1) < 1.0 |
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46 | // remove sin1, sin2 in lines 556,567 |
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47 | // (thanks to Stefano Magni) |
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48 | // 1999-10-10 - Accommodate changes done in DoAbsorption by |
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49 | // changing logic in DielectricMetal |
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50 | // 2001-10-18 - avoid Linux (gcc-2.95.2) warning about variables |
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51 | // might be used uninitialized in this function |
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52 | // moved E2_perp, E2_parl and E2_total out of 'if' |
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53 | // 2003-11-27 - Modified line 168-9 to reflect changes made to |
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54 | // G4OpticalSurface class ( by Fan Lei) |
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55 | // 2004-02-02 - Set theStatus = Undefined at start of DoIt |
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56 | // 2005-07-28 - add G4ProcessType to constructor |
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57 | // 2006-11-04 - add capability of calculating the reflectivity |
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58 | // off a metal surface by way of a complex index |
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59 | // of refraction - Thanks to Sehwook Lee and John |
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60 | // Hauptman (Dept. of Physics - Iowa State Univ.) |
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61 | // |
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62 | // Author: Peter Gumplinger |
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63 | // adopted from work by Werner Keil - April 2/96 |
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64 | // mail: gum@triumf.ca |
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65 | // |
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66 | //////////////////////////////////////////////////////////////////////// |
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67 | |
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68 | #include "G4ios.hh" |
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69 | #include "G4OpProcessSubType.hh" |
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70 | |
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71 | #include "G4OpBoundaryProcess.hh" |
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72 | #include "G4GeometryTolerance.hh" |
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73 | |
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74 | ///////////////////////// |
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75 | // Class Implementation |
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76 | ///////////////////////// |
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77 | |
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78 | ////////////// |
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79 | // Operators |
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80 | ////////////// |
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81 | |
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82 | // G4OpBoundaryProcess::operator=(const G4OpBoundaryProcess &right) |
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83 | // { |
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84 | // } |
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85 | |
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86 | ///////////////// |
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87 | // Constructors |
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88 | ///////////////// |
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89 | |
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90 | G4OpBoundaryProcess::G4OpBoundaryProcess(const G4String& processName, |
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91 | G4ProcessType type) |
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92 | : G4VDiscreteProcess(processName, type) |
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93 | { |
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94 | if ( verboseLevel > 0) { |
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95 | G4cout << GetProcessName() << " is created " << G4endl; |
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96 | } |
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97 | |
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98 | SetProcessSubType(fOpBoundary); |
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99 | |
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100 | theStatus = Undefined; |
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101 | theModel = glisur; |
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102 | theFinish = polished; |
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103 | theReflectivity = 1.; |
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104 | theEfficiency = 0.; |
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105 | |
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106 | prob_sl = 0.; |
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107 | prob_ss = 0.; |
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108 | prob_bs = 0.; |
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109 | |
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110 | kCarTolerance = G4GeometryTolerance::GetInstance() |
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111 | ->GetSurfaceTolerance(); |
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112 | |
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113 | } |
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114 | |
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115 | // G4OpBoundaryProcess::G4OpBoundaryProcess(const G4OpBoundaryProcess &right) |
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116 | // { |
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117 | // } |
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118 | |
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119 | //////////////// |
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120 | // Destructors |
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121 | //////////////// |
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122 | |
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123 | G4OpBoundaryProcess::~G4OpBoundaryProcess(){} |
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124 | |
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125 | //////////// |
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126 | // Methods |
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127 | //////////// |
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128 | |
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129 | // PostStepDoIt |
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130 | // ------------ |
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131 | // |
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132 | G4VParticleChange* |
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133 | G4OpBoundaryProcess::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep) |
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134 | { |
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135 | theStatus = Undefined; |
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136 | |
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137 | aParticleChange.Initialize(aTrack); |
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138 | |
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139 | G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint(); |
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140 | G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint(); |
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141 | |
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142 | if (pPostStepPoint->GetStepStatus() != fGeomBoundary){ |
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143 | theStatus = NotAtBoundary; |
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144 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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145 | } |
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146 | if (aTrack.GetStepLength()<=kCarTolerance/2){ |
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147 | theStatus = StepTooSmall; |
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148 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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149 | } |
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150 | |
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151 | Material1 = pPreStepPoint -> GetMaterial(); |
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152 | Material2 = pPostStepPoint -> GetMaterial(); |
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153 | |
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154 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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155 | |
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156 | thePhotonMomentum = aParticle->GetTotalMomentum(); |
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157 | OldMomentum = aParticle->GetMomentumDirection(); |
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158 | OldPolarization = aParticle->GetPolarization(); |
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159 | |
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160 | G4ThreeVector theGlobalPoint = pPostStepPoint->GetPosition(); |
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161 | |
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162 | G4Navigator* theNavigator = |
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163 | G4TransportationManager::GetTransportationManager()-> |
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164 | GetNavigatorForTracking(); |
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165 | |
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166 | G4ThreeVector theLocalPoint = theNavigator-> |
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167 | GetGlobalToLocalTransform(). |
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168 | TransformPoint(theGlobalPoint); |
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169 | |
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170 | G4ThreeVector theLocalNormal; // Normal points back into volume |
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171 | |
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172 | G4bool valid; |
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173 | theLocalNormal = theNavigator->GetLocalExitNormal(&valid); |
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174 | |
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175 | if (valid) { |
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176 | theLocalNormal = -theLocalNormal; |
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177 | } |
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178 | else { |
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179 | G4cerr << " G4OpBoundaryProcess/PostStepDoIt(): " |
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180 | << " The Navigator reports that it returned an invalid normal" |
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181 | << G4endl; |
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182 | G4Exception("G4OpBoundaryProcess::PostStepDoIt", |
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183 | "Invalid Surface Normal", |
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184 | EventMustBeAborted, |
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185 | "Geometry must return valid surface normal"); |
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186 | } |
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187 | |
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188 | theGlobalNormal = theNavigator->GetLocalToGlobalTransform(). |
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189 | TransformAxis(theLocalNormal); |
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190 | |
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191 | if (OldMomentum * theGlobalNormal > 0.0) { |
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192 | #ifdef G4DEBUG_OPTICAL |
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193 | G4cerr << " G4OpBoundaryProcess/PostStepDoIt(): " |
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194 | << " theGlobalNormal points the wrong direction " |
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195 | << G4endl; |
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196 | #endif |
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197 | theGlobalNormal = -theGlobalNormal; |
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198 | } |
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199 | |
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200 | G4MaterialPropertiesTable* aMaterialPropertiesTable; |
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201 | G4MaterialPropertyVector* Rindex; |
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202 | |
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203 | aMaterialPropertiesTable = Material1->GetMaterialPropertiesTable(); |
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204 | if (aMaterialPropertiesTable) { |
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205 | Rindex = aMaterialPropertiesTable->GetProperty("RINDEX"); |
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206 | } |
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207 | else { |
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208 | theStatus = NoRINDEX; |
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209 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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210 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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211 | } |
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212 | |
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213 | if (Rindex) { |
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214 | Rindex1 = Rindex->GetProperty(thePhotonMomentum); |
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215 | } |
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216 | else { |
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217 | theStatus = NoRINDEX; |
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218 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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219 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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220 | } |
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221 | |
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222 | theModel = glisur; |
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223 | theFinish = polished; |
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224 | |
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225 | G4SurfaceType type = dielectric_dielectric; |
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226 | |
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227 | Rindex = NULL; |
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228 | OpticalSurface = NULL; |
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229 | |
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230 | G4LogicalSurface* Surface = NULL; |
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231 | |
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232 | Surface = G4LogicalBorderSurface::GetSurface |
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233 | (pPreStepPoint ->GetPhysicalVolume(), |
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234 | pPostStepPoint->GetPhysicalVolume()); |
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235 | |
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236 | if (Surface == NULL){ |
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237 | G4bool enteredDaughter=(pPostStepPoint->GetPhysicalVolume() |
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238 | ->GetMotherLogical() == |
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239 | pPreStepPoint->GetPhysicalVolume() |
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240 | ->GetLogicalVolume()); |
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241 | if(enteredDaughter){ |
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242 | Surface = G4LogicalSkinSurface::GetSurface |
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243 | (pPostStepPoint->GetPhysicalVolume()-> |
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244 | GetLogicalVolume()); |
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245 | if(Surface == NULL) |
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246 | Surface = G4LogicalSkinSurface::GetSurface |
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247 | (pPreStepPoint->GetPhysicalVolume()-> |
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248 | GetLogicalVolume()); |
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249 | } |
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250 | else { |
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251 | Surface = G4LogicalSkinSurface::GetSurface |
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252 | (pPreStepPoint->GetPhysicalVolume()-> |
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253 | GetLogicalVolume()); |
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254 | if(Surface == NULL) |
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255 | Surface = G4LogicalSkinSurface::GetSurface |
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256 | (pPostStepPoint->GetPhysicalVolume()-> |
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257 | GetLogicalVolume()); |
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258 | } |
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259 | } |
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260 | |
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261 | if (Surface) OpticalSurface = |
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262 | dynamic_cast <G4OpticalSurface*> (Surface->GetSurfaceProperty()); |
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263 | |
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264 | if (OpticalSurface) { |
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265 | |
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266 | type = OpticalSurface->GetType(); |
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267 | theModel = OpticalSurface->GetModel(); |
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268 | theFinish = OpticalSurface->GetFinish(); |
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269 | |
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270 | aMaterialPropertiesTable = OpticalSurface-> |
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271 | GetMaterialPropertiesTable(); |
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272 | |
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273 | if (aMaterialPropertiesTable) { |
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274 | |
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275 | if (theFinish == polishedbackpainted || |
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276 | theFinish == groundbackpainted ) { |
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277 | Rindex = aMaterialPropertiesTable->GetProperty("RINDEX"); |
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278 | if (Rindex) { |
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279 | Rindex2 = Rindex->GetProperty(thePhotonMomentum); |
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280 | } |
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281 | else { |
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282 | theStatus = NoRINDEX; |
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283 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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284 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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285 | } |
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286 | } |
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287 | |
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288 | PropertyPointer = |
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289 | aMaterialPropertiesTable->GetProperty("REFLECTIVITY"); |
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290 | PropertyPointer1 = |
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291 | aMaterialPropertiesTable->GetProperty("REALRINDEX"); |
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292 | PropertyPointer2 = |
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293 | aMaterialPropertiesTable->GetProperty("IMAGINARYRINDEX"); |
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294 | |
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295 | iTE = 1; |
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296 | iTM = 1; |
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297 | |
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298 | if (PropertyPointer) { |
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299 | |
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300 | theReflectivity = |
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301 | PropertyPointer->GetProperty(thePhotonMomentum); |
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302 | |
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303 | } else if (PropertyPointer1 && PropertyPointer2) { |
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304 | |
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305 | CalculateReflectivity(); |
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306 | |
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307 | } else { |
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308 | theReflectivity = 1.0; |
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309 | } |
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310 | |
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311 | PropertyPointer = |
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312 | aMaterialPropertiesTable->GetProperty("EFFICIENCY"); |
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313 | if (PropertyPointer) { |
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314 | theEfficiency = |
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315 | PropertyPointer->GetProperty(thePhotonMomentum); |
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316 | } else { |
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317 | theEfficiency = 0.0; |
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318 | } |
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319 | |
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320 | if ( theModel == unified ) { |
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321 | PropertyPointer = |
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322 | aMaterialPropertiesTable->GetProperty("SPECULARLOBECONSTANT"); |
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323 | if (PropertyPointer) { |
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324 | prob_sl = |
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325 | PropertyPointer->GetProperty(thePhotonMomentum); |
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326 | } else { |
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327 | prob_sl = 0.0; |
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328 | } |
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329 | |
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330 | PropertyPointer = |
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331 | aMaterialPropertiesTable->GetProperty("SPECULARSPIKECONSTANT"); |
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332 | if (PropertyPointer) { |
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333 | prob_ss = |
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334 | PropertyPointer->GetProperty(thePhotonMomentum); |
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335 | } else { |
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336 | prob_ss = 0.0; |
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337 | } |
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338 | |
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339 | PropertyPointer = |
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340 | aMaterialPropertiesTable->GetProperty("BACKSCATTERCONSTANT"); |
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341 | if (PropertyPointer) { |
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342 | prob_bs = |
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343 | PropertyPointer->GetProperty(thePhotonMomentum); |
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344 | } else { |
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345 | prob_bs = 0.0; |
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346 | } |
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347 | } |
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348 | } |
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349 | else if (theFinish == polishedbackpainted || |
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350 | theFinish == groundbackpainted ) { |
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351 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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352 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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353 | } |
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354 | } |
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355 | |
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356 | if (type == dielectric_dielectric ) { |
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357 | if (theFinish == polished || theFinish == ground ) { |
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358 | |
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359 | if (Material1 == Material2){ |
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360 | theStatus = SameMaterial; |
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361 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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362 | } |
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363 | aMaterialPropertiesTable = |
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364 | Material2->GetMaterialPropertiesTable(); |
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365 | if (aMaterialPropertiesTable) |
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366 | Rindex = aMaterialPropertiesTable->GetProperty("RINDEX"); |
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367 | if (Rindex) { |
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368 | Rindex2 = Rindex->GetProperty(thePhotonMomentum); |
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369 | } |
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370 | else { |
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371 | theStatus = NoRINDEX; |
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372 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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373 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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374 | } |
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375 | } |
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376 | } |
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377 | |
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378 | if ( verboseLevel > 0 ) { |
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379 | G4cout << " Photon at Boundary! " << G4endl; |
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380 | G4cout << " Old Momentum Direction: " << OldMomentum << G4endl; |
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381 | G4cout << " Old Polarization: " << OldPolarization << G4endl; |
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382 | } |
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383 | |
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384 | if (type == dielectric_metal) { |
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385 | |
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386 | DielectricMetal(); |
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387 | |
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388 | // Uncomment the following lines if you wish to have |
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389 | // Transmission instead of Absorption |
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390 | // if (theStatus == Absorption) { |
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391 | // return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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392 | // } |
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393 | |
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394 | } |
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395 | else if (type == dielectric_dielectric) { |
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396 | |
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397 | if ( theFinish == polishedfrontpainted || |
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398 | theFinish == groundfrontpainted ) { |
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399 | |
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400 | if( !G4BooleanRand(theReflectivity) ) { |
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401 | DoAbsorption(); |
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402 | } |
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403 | else { |
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404 | if ( theFinish == groundfrontpainted ) |
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405 | theStatus = LambertianReflection; |
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406 | DoReflection(); |
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407 | } |
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408 | } |
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409 | else { |
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410 | DielectricDielectric(); |
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411 | } |
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412 | } |
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413 | else { |
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414 | |
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415 | G4cerr << " Error: G4BoundaryProcess: illegal boundary type " << G4endl; |
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416 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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417 | |
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418 | } |
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419 | |
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420 | NewMomentum = NewMomentum.unit(); |
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421 | NewPolarization = NewPolarization.unit(); |
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422 | |
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423 | if ( verboseLevel > 0) { |
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424 | G4cout << " New Momentum Direction: " << NewMomentum << G4endl; |
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425 | G4cout << " New Polarization: " << NewPolarization << G4endl; |
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426 | if ( theStatus == Undefined ) |
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427 | G4cout << " *** Undefined *** " << G4endl; |
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428 | if ( theStatus == FresnelRefraction ) |
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429 | G4cout << " *** FresnelRefraction *** " << G4endl; |
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430 | if ( theStatus == FresnelReflection ) |
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431 | G4cout << " *** FresnelReflection *** " << G4endl; |
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432 | if ( theStatus == TotalInternalReflection ) |
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433 | G4cout << " *** TotalInternalReflection *** " << G4endl; |
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434 | if ( theStatus == LambertianReflection ) |
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435 | G4cout << " *** LambertianReflection *** " << G4endl; |
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436 | if ( theStatus == LobeReflection ) |
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437 | G4cout << " *** LobeReflection *** " << G4endl; |
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438 | if ( theStatus == SpikeReflection ) |
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439 | G4cout << " *** SpikeReflection *** " << G4endl; |
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440 | if ( theStatus == BackScattering ) |
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441 | G4cout << " *** BackScattering *** " << G4endl; |
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442 | if ( theStatus == Absorption ) |
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443 | G4cout << " *** Absorption *** " << G4endl; |
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444 | if ( theStatus == Detection ) |
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445 | G4cout << " *** Detection *** " << G4endl; |
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446 | if ( theStatus == NotAtBoundary ) |
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447 | G4cout << " *** NotAtBoundary *** " << G4endl; |
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448 | if ( theStatus == SameMaterial ) |
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449 | G4cout << " *** SameMaterial *** " << G4endl; |
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450 | if ( theStatus == StepTooSmall ) |
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451 | G4cout << " *** StepTooSmall *** " << G4endl; |
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452 | if ( theStatus == NoRINDEX ) |
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453 | G4cout << " *** NoRINDEX *** " << G4endl; |
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454 | } |
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455 | |
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456 | aParticleChange.ProposeMomentumDirection(NewMomentum); |
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457 | aParticleChange.ProposePolarization(NewPolarization); |
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458 | |
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459 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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460 | } |
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461 | |
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462 | G4ThreeVector |
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463 | G4OpBoundaryProcess::GetFacetNormal(const G4ThreeVector& Momentum, |
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464 | const G4ThreeVector& Normal ) const |
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465 | { |
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466 | G4ThreeVector FacetNormal; |
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467 | |
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468 | if (theModel == unified) { |
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469 | |
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470 | /* This function code alpha to a random value taken from the |
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471 | distribution p(alpha) = g(alpha; 0, sigma_alpha)*std::sin(alpha), |
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472 | for alpha > 0 and alpha < 90, where g(alpha; 0, sigma_alpha) |
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473 | is a gaussian distribution with mean 0 and standard deviation |
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474 | sigma_alpha. */ |
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475 | |
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476 | G4double alpha; |
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477 | |
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478 | G4double sigma_alpha = 0.0; |
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479 | if (OpticalSurface) sigma_alpha = OpticalSurface->GetSigmaAlpha(); |
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480 | |
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481 | G4double f_max = std::min(1.0,4.*sigma_alpha); |
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482 | |
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483 | do { |
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484 | do { |
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485 | alpha = G4RandGauss::shoot(0.0,sigma_alpha); |
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486 | } while (G4UniformRand()*f_max > std::sin(alpha) || alpha >= halfpi ); |
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487 | |
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488 | G4double phi = G4UniformRand()*twopi; |
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489 | |
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490 | G4double SinAlpha = std::sin(alpha); |
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491 | G4double CosAlpha = std::cos(alpha); |
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492 | G4double SinPhi = std::sin(phi); |
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493 | G4double CosPhi = std::cos(phi); |
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494 | |
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495 | G4double unit_x = SinAlpha * CosPhi; |
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496 | G4double unit_y = SinAlpha * SinPhi; |
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497 | G4double unit_z = CosAlpha; |
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498 | |
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499 | FacetNormal.setX(unit_x); |
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500 | FacetNormal.setY(unit_y); |
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501 | FacetNormal.setZ(unit_z); |
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502 | |
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503 | G4ThreeVector tmpNormal = Normal; |
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504 | |
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505 | FacetNormal.rotateUz(tmpNormal); |
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506 | } while (Momentum * FacetNormal >= 0.0); |
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507 | } |
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508 | else { |
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509 | |
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510 | G4double polish = 1.0; |
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511 | if (OpticalSurface) polish = OpticalSurface->GetPolish(); |
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512 | |
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513 | if (polish < 1.0) { |
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514 | do { |
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515 | G4ThreeVector smear; |
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516 | do { |
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517 | smear.setX(2.*G4UniformRand()-1.0); |
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518 | smear.setY(2.*G4UniformRand()-1.0); |
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519 | smear.setZ(2.*G4UniformRand()-1.0); |
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520 | } while (smear.mag()>1.0); |
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521 | smear = (1.-polish) * smear; |
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522 | FacetNormal = Normal + smear; |
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523 | } while (Momentum * FacetNormal >= 0.0); |
---|
524 | FacetNormal = FacetNormal.unit(); |
---|
525 | } |
---|
526 | else { |
---|
527 | FacetNormal = Normal; |
---|
528 | } |
---|
529 | } |
---|
530 | return FacetNormal; |
---|
531 | } |
---|
532 | |
---|
533 | void G4OpBoundaryProcess::DielectricMetal() |
---|
534 | { |
---|
535 | G4int n = 0; |
---|
536 | |
---|
537 | do { |
---|
538 | |
---|
539 | n++; |
---|
540 | |
---|
541 | if( !G4BooleanRand(theReflectivity) && n == 1 ) { |
---|
542 | |
---|
543 | // Comment out DoAbsorption and uncomment theStatus = Absorption; |
---|
544 | // if you wish to have Transmission instead of Absorption |
---|
545 | |
---|
546 | DoAbsorption(); |
---|
547 | // theStatus = Absorption; |
---|
548 | break; |
---|
549 | |
---|
550 | } |
---|
551 | else { |
---|
552 | |
---|
553 | if (PropertyPointer1 && PropertyPointer2) { |
---|
554 | if ( n > 1 ) { |
---|
555 | CalculateReflectivity(); |
---|
556 | if ( !G4BooleanRand(theReflectivity) ) { |
---|
557 | DoAbsorption(); |
---|
558 | break; |
---|
559 | } |
---|
560 | } |
---|
561 | } |
---|
562 | |
---|
563 | if ( theModel == glisur || theFinish == polished ) { |
---|
564 | |
---|
565 | DoReflection(); |
---|
566 | |
---|
567 | } else { |
---|
568 | |
---|
569 | if ( n == 1 ) ChooseReflection(); |
---|
570 | |
---|
571 | if ( theStatus == LambertianReflection ) { |
---|
572 | DoReflection(); |
---|
573 | } |
---|
574 | else if ( theStatus == BackScattering ) { |
---|
575 | NewMomentum = -OldMomentum; |
---|
576 | NewPolarization = -OldPolarization; |
---|
577 | } |
---|
578 | else { |
---|
579 | |
---|
580 | if(theStatus==LobeReflection){ |
---|
581 | if ( PropertyPointer1 && PropertyPointer2 ){ |
---|
582 | } else { |
---|
583 | theFacetNormal = |
---|
584 | GetFacetNormal(OldMomentum,theGlobalNormal); |
---|
585 | } |
---|
586 | } |
---|
587 | |
---|
588 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
589 | NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal; |
---|
590 | G4double EdotN = OldPolarization * theFacetNormal; |
---|
591 | |
---|
592 | G4ThreeVector A_trans, A_paral; |
---|
593 | |
---|
594 | if (sint1 > 0.0 ) { |
---|
595 | A_trans = OldMomentum.cross(theFacetNormal); |
---|
596 | A_trans = A_trans.unit(); |
---|
597 | } else { |
---|
598 | A_trans = OldPolarization; |
---|
599 | } |
---|
600 | A_paral = NewMomentum.cross(A_trans); |
---|
601 | A_paral = A_paral.unit(); |
---|
602 | |
---|
603 | if(iTE>0&&iTM>0) { |
---|
604 | NewPolarization = |
---|
605 | -OldPolarization + (2.*EdotN)*theFacetNormal; |
---|
606 | } else if (iTE>0) { |
---|
607 | NewPolarization = -A_trans; |
---|
608 | } else if (iTM>0) { |
---|
609 | NewPolarization = -A_paral; |
---|
610 | } |
---|
611 | |
---|
612 | } |
---|
613 | |
---|
614 | } |
---|
615 | |
---|
616 | OldMomentum = NewMomentum; |
---|
617 | OldPolarization = NewPolarization; |
---|
618 | |
---|
619 | } |
---|
620 | |
---|
621 | } while (NewMomentum * theGlobalNormal < 0.0); |
---|
622 | } |
---|
623 | |
---|
624 | void G4OpBoundaryProcess::DielectricDielectric() |
---|
625 | { |
---|
626 | G4bool Inside = false; |
---|
627 | G4bool Swap = false; |
---|
628 | |
---|
629 | leap: |
---|
630 | |
---|
631 | G4bool Through = false; |
---|
632 | G4bool Done = false; |
---|
633 | |
---|
634 | do { |
---|
635 | |
---|
636 | if (Through) { |
---|
637 | Swap = !Swap; |
---|
638 | Through = false; |
---|
639 | theGlobalNormal = -theGlobalNormal; |
---|
640 | G4SwapPtr(Material1,Material2); |
---|
641 | G4SwapObj(&Rindex1,&Rindex2); |
---|
642 | } |
---|
643 | |
---|
644 | if ( theFinish == ground || theFinish == groundbackpainted ) { |
---|
645 | theFacetNormal = |
---|
646 | GetFacetNormal(OldMomentum,theGlobalNormal); |
---|
647 | } |
---|
648 | else { |
---|
649 | theFacetNormal = theGlobalNormal; |
---|
650 | } |
---|
651 | |
---|
652 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
653 | G4double EdotN = OldPolarization * theFacetNormal; |
---|
654 | |
---|
655 | cost1 = - PdotN; |
---|
656 | if (std::abs(cost1) < 1.0-kCarTolerance){ |
---|
657 | sint1 = std::sqrt(1.-cost1*cost1); |
---|
658 | sint2 = sint1*Rindex1/Rindex2; // *** Snell's Law *** |
---|
659 | } |
---|
660 | else { |
---|
661 | sint1 = 0.0; |
---|
662 | sint2 = 0.0; |
---|
663 | } |
---|
664 | |
---|
665 | if (sint2 >= 1.0) { |
---|
666 | |
---|
667 | // Simulate total internal reflection |
---|
668 | |
---|
669 | if (Swap) Swap = !Swap; |
---|
670 | |
---|
671 | theStatus = TotalInternalReflection; |
---|
672 | |
---|
673 | if ( theModel == unified && theFinish != polished ) |
---|
674 | ChooseReflection(); |
---|
675 | |
---|
676 | if ( theStatus == LambertianReflection ) { |
---|
677 | DoReflection(); |
---|
678 | } |
---|
679 | else if ( theStatus == BackScattering ) { |
---|
680 | NewMomentum = -OldMomentum; |
---|
681 | NewPolarization = -OldPolarization; |
---|
682 | } |
---|
683 | else { |
---|
684 | |
---|
685 | PdotN = OldMomentum * theFacetNormal; |
---|
686 | NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal; |
---|
687 | EdotN = OldPolarization * theFacetNormal; |
---|
688 | NewPolarization = -OldPolarization + (2.*EdotN)*theFacetNormal; |
---|
689 | |
---|
690 | } |
---|
691 | } |
---|
692 | else if (sint2 < 1.0) { |
---|
693 | |
---|
694 | // Calculate amplitude for transmission (Q = P x N) |
---|
695 | |
---|
696 | if (cost1 > 0.0) { |
---|
697 | cost2 = std::sqrt(1.-sint2*sint2); |
---|
698 | } |
---|
699 | else { |
---|
700 | cost2 = -std::sqrt(1.-sint2*sint2); |
---|
701 | } |
---|
702 | |
---|
703 | G4ThreeVector A_trans, A_paral, E1pp, E1pl; |
---|
704 | G4double E1_perp, E1_parl; |
---|
705 | |
---|
706 | if (sint1 > 0.0) { |
---|
707 | A_trans = OldMomentum.cross(theFacetNormal); |
---|
708 | A_trans = A_trans.unit(); |
---|
709 | E1_perp = OldPolarization * A_trans; |
---|
710 | E1pp = E1_perp * A_trans; |
---|
711 | E1pl = OldPolarization - E1pp; |
---|
712 | E1_parl = E1pl.mag(); |
---|
713 | } |
---|
714 | else { |
---|
715 | A_trans = OldPolarization; |
---|
716 | // Here we Follow Jackson's conventions and we set the |
---|
717 | // parallel component = 1 in case of a ray perpendicular |
---|
718 | // to the surface |
---|
719 | E1_perp = 0.0; |
---|
720 | E1_parl = 1.0; |
---|
721 | } |
---|
722 | |
---|
723 | G4double s1 = Rindex1*cost1; |
---|
724 | G4double E2_perp = 2.*s1*E1_perp/(Rindex1*cost1+Rindex2*cost2); |
---|
725 | G4double E2_parl = 2.*s1*E1_parl/(Rindex2*cost1+Rindex1*cost2); |
---|
726 | G4double E2_total = E2_perp*E2_perp + E2_parl*E2_parl; |
---|
727 | G4double s2 = Rindex2*cost2*E2_total; |
---|
728 | |
---|
729 | G4double TransCoeff; |
---|
730 | |
---|
731 | if (cost1 != 0.0) { |
---|
732 | TransCoeff = s2/s1; |
---|
733 | } |
---|
734 | else { |
---|
735 | TransCoeff = 0.0; |
---|
736 | } |
---|
737 | |
---|
738 | G4double E2_abs, C_parl, C_perp; |
---|
739 | |
---|
740 | if ( !G4BooleanRand(TransCoeff) ) { |
---|
741 | |
---|
742 | // Simulate reflection |
---|
743 | |
---|
744 | if (Swap) Swap = !Swap; |
---|
745 | |
---|
746 | theStatus = FresnelReflection; |
---|
747 | |
---|
748 | if ( theModel == unified && theFinish != polished ) |
---|
749 | ChooseReflection(); |
---|
750 | |
---|
751 | if ( theStatus == LambertianReflection ) { |
---|
752 | DoReflection(); |
---|
753 | } |
---|
754 | else if ( theStatus == BackScattering ) { |
---|
755 | NewMomentum = -OldMomentum; |
---|
756 | NewPolarization = -OldPolarization; |
---|
757 | } |
---|
758 | else { |
---|
759 | |
---|
760 | PdotN = OldMomentum * theFacetNormal; |
---|
761 | NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal; |
---|
762 | |
---|
763 | if (sint1 > 0.0) { // incident ray oblique |
---|
764 | |
---|
765 | E2_parl = Rindex2*E2_parl/Rindex1 - E1_parl; |
---|
766 | E2_perp = E2_perp - E1_perp; |
---|
767 | E2_total = E2_perp*E2_perp + E2_parl*E2_parl; |
---|
768 | A_paral = NewMomentum.cross(A_trans); |
---|
769 | A_paral = A_paral.unit(); |
---|
770 | E2_abs = std::sqrt(E2_total); |
---|
771 | C_parl = E2_parl/E2_abs; |
---|
772 | C_perp = E2_perp/E2_abs; |
---|
773 | |
---|
774 | NewPolarization = C_parl*A_paral + C_perp*A_trans; |
---|
775 | |
---|
776 | } |
---|
777 | |
---|
778 | else { // incident ray perpendicular |
---|
779 | |
---|
780 | if (Rindex2 > Rindex1) { |
---|
781 | NewPolarization = - OldPolarization; |
---|
782 | } |
---|
783 | else { |
---|
784 | NewPolarization = OldPolarization; |
---|
785 | } |
---|
786 | |
---|
787 | } |
---|
788 | } |
---|
789 | } |
---|
790 | else { // photon gets transmitted |
---|
791 | |
---|
792 | // Simulate transmission/refraction |
---|
793 | |
---|
794 | Inside = !Inside; |
---|
795 | Through = true; |
---|
796 | theStatus = FresnelRefraction; |
---|
797 | |
---|
798 | if (sint1 > 0.0) { // incident ray oblique |
---|
799 | |
---|
800 | G4double alpha = cost1 - cost2*(Rindex2/Rindex1); |
---|
801 | NewMomentum = OldMomentum + alpha*theFacetNormal; |
---|
802 | NewMomentum = NewMomentum.unit(); |
---|
803 | PdotN = -cost2; |
---|
804 | A_paral = NewMomentum.cross(A_trans); |
---|
805 | A_paral = A_paral.unit(); |
---|
806 | E2_abs = std::sqrt(E2_total); |
---|
807 | C_parl = E2_parl/E2_abs; |
---|
808 | C_perp = E2_perp/E2_abs; |
---|
809 | |
---|
810 | NewPolarization = C_parl*A_paral + C_perp*A_trans; |
---|
811 | |
---|
812 | } |
---|
813 | else { // incident ray perpendicular |
---|
814 | |
---|
815 | NewMomentum = OldMomentum; |
---|
816 | NewPolarization = OldPolarization; |
---|
817 | |
---|
818 | } |
---|
819 | } |
---|
820 | } |
---|
821 | |
---|
822 | OldMomentum = NewMomentum.unit(); |
---|
823 | OldPolarization = NewPolarization.unit(); |
---|
824 | |
---|
825 | if (theStatus == FresnelRefraction) { |
---|
826 | Done = (NewMomentum * theGlobalNormal <= 0.0); |
---|
827 | } |
---|
828 | else { |
---|
829 | Done = (NewMomentum * theGlobalNormal >= 0.0); |
---|
830 | } |
---|
831 | |
---|
832 | } while (!Done); |
---|
833 | |
---|
834 | if (Inside && !Swap) { |
---|
835 | if( theFinish == polishedbackpainted || |
---|
836 | theFinish == groundbackpainted ) { |
---|
837 | |
---|
838 | if( !G4BooleanRand(theReflectivity) ) { |
---|
839 | DoAbsorption(); |
---|
840 | } |
---|
841 | else { |
---|
842 | if (theStatus != FresnelRefraction ) { |
---|
843 | theGlobalNormal = -theGlobalNormal; |
---|
844 | } |
---|
845 | else { |
---|
846 | Swap = !Swap; |
---|
847 | G4SwapPtr(Material1,Material2); |
---|
848 | G4SwapObj(&Rindex1,&Rindex2); |
---|
849 | } |
---|
850 | if ( theFinish == groundbackpainted ) |
---|
851 | theStatus = LambertianReflection; |
---|
852 | |
---|
853 | DoReflection(); |
---|
854 | |
---|
855 | theGlobalNormal = -theGlobalNormal; |
---|
856 | OldMomentum = NewMomentum; |
---|
857 | |
---|
858 | goto leap; |
---|
859 | } |
---|
860 | } |
---|
861 | } |
---|
862 | } |
---|
863 | |
---|
864 | // GetMeanFreePath |
---|
865 | // --------------- |
---|
866 | // |
---|
867 | G4double G4OpBoundaryProcess::GetMeanFreePath(const G4Track& , |
---|
868 | G4double , |
---|
869 | G4ForceCondition* condition) |
---|
870 | { |
---|
871 | *condition = Forced; |
---|
872 | |
---|
873 | return DBL_MAX; |
---|
874 | } |
---|
875 | |
---|
876 | G4double G4OpBoundaryProcess::GetIncidentAngle() |
---|
877 | { |
---|
878 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
879 | G4double magP= OldMomentum.mag(); |
---|
880 | G4double magN= theFacetNormal.mag(); |
---|
881 | G4double incidentangle = pi - std::acos(PdotN/(magP*magN)); |
---|
882 | |
---|
883 | return incidentangle; |
---|
884 | } |
---|
885 | |
---|
886 | G4double G4OpBoundaryProcess::GetReflectivity(G4double E1_perp, |
---|
887 | G4double E1_parl, |
---|
888 | G4double incidentangle, |
---|
889 | G4double RealRindex, |
---|
890 | G4double ImaginaryRindex) |
---|
891 | { |
---|
892 | |
---|
893 | G4complex Reflectivity, Reflectivity_TE, Reflectivity_TM; |
---|
894 | G4complex N(RealRindex, ImaginaryRindex); |
---|
895 | G4complex CosPhi; |
---|
896 | |
---|
897 | G4complex u(1,0); //unit number 1 |
---|
898 | |
---|
899 | G4complex numeratorTE; // E1_perp=1 E1_parl=0 -> TE polarization |
---|
900 | G4complex numeratorTM; // E1_parl=1 E1_perp=0 -> TM polarization |
---|
901 | G4complex denominatorTE, denominatorTM; |
---|
902 | G4complex rTM, rTE; |
---|
903 | |
---|
904 | // Following two equations, rTM and rTE, are from: "Introduction To Modern |
---|
905 | // Optics" written by Fowles |
---|
906 | |
---|
907 | CosPhi=std::sqrt(u-((std::sin(incidentangle)*std::sin(incidentangle))/(N*N))); |
---|
908 | |
---|
909 | numeratorTE = std::cos(incidentangle) - N*CosPhi; |
---|
910 | denominatorTE = std::cos(incidentangle) + N*CosPhi; |
---|
911 | rTE = numeratorTE/denominatorTE; |
---|
912 | |
---|
913 | numeratorTM = N*std::cos(incidentangle) - CosPhi; |
---|
914 | denominatorTM = N*std::cos(incidentangle) + CosPhi; |
---|
915 | rTM = numeratorTM/denominatorTM; |
---|
916 | |
---|
917 | // This is my calculaton for reflectivity on a metalic surface |
---|
918 | // depending on the fraction of TE and TM polarization |
---|
919 | // when TE polarization, E1_parl=0 and E1_perp=1, R=abs(rTE)^2 and |
---|
920 | // when TM polarization, E1_parl=1 and E1_perp=0, R=abs(rTM)^2 |
---|
921 | |
---|
922 | Reflectivity_TE = (rTE*conj(rTE))*(E1_perp*E1_perp) |
---|
923 | / (E1_perp*E1_perp + E1_parl*E1_parl); |
---|
924 | Reflectivity_TM = (rTM*conj(rTM))*(E1_parl*E1_parl) |
---|
925 | / (E1_perp*E1_perp + E1_parl*E1_parl); |
---|
926 | Reflectivity = Reflectivity_TE + Reflectivity_TM; |
---|
927 | |
---|
928 | do { |
---|
929 | if(G4UniformRand()*real(Reflectivity) > real(Reflectivity_TE)) |
---|
930 | {iTE = -1;}else{iTE = 1;} |
---|
931 | if(G4UniformRand()*real(Reflectivity) > real(Reflectivity_TM)) |
---|
932 | {iTM = -1;}else{iTM = 1;} |
---|
933 | } while(iTE<0&&iTM<0); |
---|
934 | |
---|
935 | return real(Reflectivity); |
---|
936 | |
---|
937 | } |
---|
938 | |
---|
939 | void G4OpBoundaryProcess::CalculateReflectivity() |
---|
940 | { |
---|
941 | G4double RealRindex = |
---|
942 | PropertyPointer1->GetProperty(thePhotonMomentum); |
---|
943 | G4double ImaginaryRindex = |
---|
944 | PropertyPointer2->GetProperty(thePhotonMomentum); |
---|
945 | |
---|
946 | // calculate FacetNormal |
---|
947 | if ( theFinish == ground ) { |
---|
948 | theFacetNormal = |
---|
949 | GetFacetNormal(OldMomentum, theGlobalNormal); |
---|
950 | } else { |
---|
951 | theFacetNormal = theGlobalNormal; |
---|
952 | } |
---|
953 | |
---|
954 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
955 | cost1 = -PdotN; |
---|
956 | |
---|
957 | if (std::abs(cost1) < 1.0 - kCarTolerance) { |
---|
958 | sint1 = std::sqrt(1. - cost1*cost1); |
---|
959 | } else { |
---|
960 | sint1 = 0.0; |
---|
961 | } |
---|
962 | |
---|
963 | G4ThreeVector A_trans, A_paral, E1pp, E1pl; |
---|
964 | G4double E1_perp, E1_parl; |
---|
965 | |
---|
966 | if (sint1 > 0.0 ) { |
---|
967 | A_trans = OldMomentum.cross(theFacetNormal); |
---|
968 | A_trans = A_trans.unit(); |
---|
969 | E1_perp = OldPolarization * A_trans; |
---|
970 | E1pp = E1_perp * A_trans; |
---|
971 | E1pl = OldPolarization - E1pp; |
---|
972 | E1_parl = E1pl.mag(); |
---|
973 | } |
---|
974 | else { |
---|
975 | A_trans = OldPolarization; |
---|
976 | // Here we Follow Jackson's conventions and we set the |
---|
977 | // parallel component = 1 in case of a ray perpendicular |
---|
978 | // to the surface |
---|
979 | E1_perp = 0.0; |
---|
980 | E1_parl = 1.0; |
---|
981 | } |
---|
982 | |
---|
983 | //calculate incident angle |
---|
984 | G4double incidentangle = GetIncidentAngle(); |
---|
985 | |
---|
986 | //calculate the reflectivity depending on incident angle, |
---|
987 | //polarization and complex refractive |
---|
988 | |
---|
989 | theReflectivity = |
---|
990 | GetReflectivity(E1_perp, E1_parl, incidentangle, |
---|
991 | RealRindex, ImaginaryRindex); |
---|
992 | } |
---|