[831] | 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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[1347] | 27 | // $Id: G4GeomTestSegment.cc,v 1.13 2010/08/20 09:03:54 gcosmo Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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[831] | 29 | // |
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| 30 | // -------------------------------------------------------------------- |
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| 31 | // GEANT 4 class source file |
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| 32 | // |
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| 33 | // G4GeomTestSegment |
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| 34 | // |
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| 35 | // Author: D.C.Williams, UCSC (davidw@scipp.ucsc.edu) |
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| 36 | // -------------------------------------------------------------------- |
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| 37 | |
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| 38 | #include "G4GeomTestSegment.hh" |
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| 39 | |
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| 40 | #include "G4VSolid.hh" |
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| 41 | #include "G4GeomTestLogger.hh" |
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| 42 | #include "G4GeometryTolerance.hh" |
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| 43 | |
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| 44 | // |
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| 45 | // Constructor |
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| 46 | // |
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| 47 | G4GeomTestSegment::G4GeomTestSegment( const G4VSolid *theSolid, |
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| 48 | const G4ThreeVector &theP, |
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| 49 | const G4ThreeVector &theV, |
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| 50 | G4GeomTestLogger *logger ) |
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| 51 | : solid(theSolid), |
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| 52 | p0(theP), |
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| 53 | v(theV) |
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| 54 | { |
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| 55 | kCarTolerance = G4GeometryTolerance::GetInstance()->GetSurfaceTolerance(); |
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| 56 | FindPoints(logger); |
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| 57 | } |
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| 58 | |
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| 59 | |
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| 60 | // |
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| 61 | // Simple accessors |
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| 62 | // |
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| 63 | const G4VSolid * G4GeomTestSegment::GetSolid() const { return solid; } |
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| 64 | |
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| 65 | const G4ThreeVector &G4GeomTestSegment::GetP() const { return p0; } |
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| 66 | |
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| 67 | const G4ThreeVector &G4GeomTestSegment::GetV() const { return v; } |
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| 68 | |
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| 69 | |
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| 70 | // |
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| 71 | // Return number points |
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| 72 | // |
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| 73 | G4int G4GeomTestSegment::GetNumberPoints() const |
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| 74 | { |
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| 75 | return points.size(); |
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| 76 | } |
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| 77 | |
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| 78 | |
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| 79 | // |
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| 80 | // Return ith point |
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| 81 | // |
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| 82 | const G4GeomTestPoint &G4GeomTestSegment::GetPoint( G4int i ) const |
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| 83 | { |
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| 84 | return points[i]; |
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| 85 | } |
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| 86 | |
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| 87 | |
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| 88 | // |
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| 89 | // FindPoints |
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| 90 | // |
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| 91 | // Do the dirty work |
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| 92 | // |
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| 93 | void G4GeomTestSegment::FindPoints( G4GeomTestLogger *logger ) |
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| 94 | { |
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| 95 | FindSomePoints( logger, true ); |
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| 96 | FindSomePoints( logger, false ); |
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| 97 | |
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| 98 | PatchInconsistencies( logger ); |
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| 99 | } |
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| 100 | |
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| 101 | |
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| 102 | // |
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| 103 | // PatchInconsistencies |
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| 104 | // |
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| 105 | // Search for inconsistancies in the hit list and patch |
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| 106 | // them up, if possible |
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| 107 | // |
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| 108 | void G4GeomTestSegment::PatchInconsistencies( G4GeomTestLogger *logger ) |
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| 109 | { |
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| 110 | if (points.size() == 0) return; |
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| 111 | |
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| 112 | // |
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| 113 | // Sort |
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| 114 | // |
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| 115 | std::sort( points.begin(), points.end() ); |
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| 116 | |
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| 117 | // |
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| 118 | // Loop over entering/leaving pairs |
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| 119 | // |
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| 120 | std::vector<G4GeomTestPoint>::iterator curr = points.begin(); |
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| 121 | do { |
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| 122 | |
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| 123 | std::vector<G4GeomTestPoint>::iterator next = curr + 1; |
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| 124 | |
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| 125 | // |
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| 126 | // Is the next point close by? |
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| 127 | // |
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| 128 | while (next != points.end() && |
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| 129 | next->GetDistance()-curr->GetDistance() < kCarTolerance) { |
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| 130 | // |
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| 131 | // Yup. If we have an entering/leaving pair, all is okay |
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| 132 | // |
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| 133 | if (next->Entering() != curr->Entering()) { |
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| 134 | curr = next + 1; |
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| 135 | next = curr + 1; |
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| 136 | |
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| 137 | break; |
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| 138 | } |
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| 139 | |
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| 140 | // |
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| 141 | // Otherwise, they are duplicate, and just delete one |
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| 142 | // |
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| 143 | next = points.erase(next); |
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| 144 | curr = next - 1; |
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| 145 | |
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| 146 | } |
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| 147 | |
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| 148 | if (curr == points.end()) break; |
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| 149 | |
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| 150 | // |
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| 151 | // The next point should be entering... |
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| 152 | // |
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| 153 | |
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| 154 | if (!curr->Entering()) { |
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| 155 | // |
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| 156 | // Point is out of sequence: |
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| 157 | // Test solid just before this point |
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| 158 | // |
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| 159 | G4double s = curr->GetDistance(); |
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| 160 | G4ThreeVector p = p0 + s*v; |
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| 161 | |
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| 162 | G4ThreeVector p1 = p - 10*kCarTolerance*v; |
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| 163 | |
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| 164 | if (solid->Inside(p1) == kOutside||(solid->Inside(p1)== kSurface)) { |
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| 165 | // |
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| 166 | // We are missing an entrance point near the current |
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| 167 | // point. Add one. |
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| 168 | // |
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| 169 | curr = points.insert(curr, G4GeomTestPoint( p, s, true ) ); |
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| 170 | ++curr; |
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| 171 | break; |
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| 172 | } |
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| 173 | |
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| 174 | // |
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| 175 | // Test solid just after last point |
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| 176 | // |
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| 177 | if (curr != points.begin()) { |
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| 178 | std::vector<G4GeomTestPoint>::iterator prev = curr - 1; |
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| 179 | |
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| 180 | s = prev->GetDistance(); |
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| 181 | p = p0 + s*v; |
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| 182 | |
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| 183 | p1 = p + 10*kCarTolerance*v; |
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| 184 | if ((solid->Inside(p1) == kOutside)||(solid->Inside(p1)== kSurface)) { |
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| 185 | |
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| 186 | // |
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| 187 | // We are missing an entrance point near the previous |
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| 188 | // point. Add one. |
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| 189 | // |
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| 190 | curr = points.insert(curr, G4GeomTestPoint( p, s, true ) ); |
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| 191 | ++curr; |
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| 192 | break; |
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| 193 | } |
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| 194 | } |
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| 195 | |
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| 196 | // |
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| 197 | // Oh oh. No solution. Delete the current point and complain. |
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| 198 | // |
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| 199 | logger->SolidProblem( solid, "Spurious exiting intersection point", p ); |
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| 200 | curr = points.erase(curr); |
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| 201 | break; |
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| 202 | } |
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| 203 | |
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| 204 | // |
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| 205 | // The following point should be leaving |
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| 206 | // |
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| 207 | |
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| 208 | if (next == points.end() || next->Entering() ) { |
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| 209 | // |
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| 210 | // But is missing. Check immediately after this point. |
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| 211 | // |
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| 212 | G4double s = curr->GetDistance(); |
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| 213 | G4ThreeVector p = p0 + s*v; |
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| 214 | G4ThreeVector p1 = p + 10*kCarTolerance*v; |
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| 215 | |
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| 216 | if (solid->Inside(p1) == kOutside) { |
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| 217 | // |
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| 218 | // We are missing an exit point near the current |
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| 219 | // point. Add one. |
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| 220 | // |
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| 221 | curr = points.insert(next, G4GeomTestPoint( p, s, false ) ); |
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| 222 | break; |
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| 223 | } |
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| 224 | |
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| 225 | if (next != points.end()) { |
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| 226 | // |
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| 227 | // Check just before next point |
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| 228 | // |
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| 229 | s = next->GetDistance(); |
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| 230 | p = p0 + s*v; |
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| 231 | p1 = p - 10*kCarTolerance*v; |
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| 232 | if (solid->Inside(p1) == kOutside) { |
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| 233 | // |
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| 234 | // We are missing an exit point before the next |
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| 235 | // point. Add one. |
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| 236 | // |
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| 237 | curr = points.insert(next, G4GeomTestPoint( p, s, false ) ); |
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| 238 | break; |
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| 239 | } |
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| 240 | } |
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| 241 | |
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| 242 | // |
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| 243 | // Oh oh. Hanging entering point. Delete and complain. |
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| 244 | // |
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| 245 | logger->SolidProblem( solid, "Spurious entering intersection point", p ); |
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| 246 | curr = points.erase(curr); |
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| 247 | } |
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| 248 | |
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| 249 | if(curr!=points.end()){curr = next + 1;} |
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| 250 | |
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| 251 | } while( curr != points.end() ); |
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| 252 | |
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| 253 | // |
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| 254 | // Double check |
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| 255 | // |
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| 256 | if (points.size()&1) |
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| 257 | logger->SolidProblem( solid, |
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| 258 | "Solid has odd number of intersection points", p0 ); |
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| 259 | |
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| 260 | return; |
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| 261 | } |
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| 262 | |
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| 263 | |
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| 264 | // |
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| 265 | // Find intersections either in front or behind the point |
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| 266 | // |
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| 267 | void G4GeomTestSegment::FindSomePoints( G4GeomTestLogger *logger, |
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| 268 | G4bool forward ) |
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| 269 | { |
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| 270 | G4double sign = forward ? +1 : -1; |
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| 271 | |
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| 272 | G4ThreeVector p(p0); |
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| 273 | G4ThreeVector vSearch(sign*v); |
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| 274 | G4double s(0); |
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| 275 | G4bool entering; |
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| 276 | G4double vSurfN; |
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[1347] | 277 | |
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[831] | 278 | // Look for nearest intersection point in the specified |
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| 279 | // direction and return if there isn't one |
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| 280 | // |
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| 281 | G4double dist; |
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| 282 | switch(solid->Inside(p)) { |
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| 283 | case kInside: |
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[1347] | 284 | dist = solid->DistanceToOut(p,vSearch); |
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[831] | 285 | if (dist >= kInfinity) { |
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| 286 | logger->SolidProblem( solid, |
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| 287 | "DistanceToOut(p,v) = kInfinity for point inside", p ); |
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| 288 | return; |
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| 289 | } |
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| 290 | s += sign*dist; |
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| 291 | entering = false; |
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| 292 | break; |
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| 293 | case kOutside: |
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| 294 | dist = solid->DistanceToIn(p,vSearch); |
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| 295 | if (dist >= kInfinity) return; |
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| 296 | s += sign*dist; |
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| 297 | entering = true; |
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| 298 | break; |
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| 299 | case kSurface: |
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[1347] | 300 | vSurfN=v.dot(solid->SurfaceNormal(p)); |
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| 301 | if(std::fabs(vSurfN)<kCarTolerance)vSurfN=0; |
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[831] | 302 | entering = (vSurfN < 0); |
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| 303 | break; |
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| 304 | default: |
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| 305 | logger->SolidProblem( solid, |
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| 306 | "Inside returns illegal enumerated value", p ); |
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| 307 | return; |
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| 308 | } |
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| 309 | |
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| 310 | // |
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| 311 | // Loop |
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| 312 | // |
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| 313 | // nzero = the number of consecutive zeros |
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| 314 | // |
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| 315 | G4int nzero=0; |
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| 316 | |
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| 317 | for(;;) { |
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| 318 | // |
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| 319 | // Locate point |
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| 320 | // |
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| 321 | p = p0 + s*v; |
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| 322 | |
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| 323 | if (nzero > 2) { |
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| 324 | // |
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| 325 | // Oops. In a loop. Probably along a spherical or cylindrical surface. |
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| 326 | // Let's give the tool a little help with a push |
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| 327 | // |
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| 328 | G4double push = 1E-6; |
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| 329 | s += sign*push; |
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| 330 | for(;;) { |
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| 331 | p = p0 + s*v; |
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| 332 | EInside inside = solid->Inside(p); |
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| 333 | if (inside == kInside) { |
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| 334 | entering = true; |
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| 335 | break; |
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| 336 | } |
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| 337 | else if (inside == kOutside) { |
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| 338 | entering = false; |
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| 339 | break; |
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| 340 | } |
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| 341 | |
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| 342 | push = 2*push; |
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| 343 | if (push > 0.1) { |
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| 344 | logger->SolidProblem( solid, |
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| 345 | "Push fails to fix geometry inconsistency", p ); |
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| 346 | return; |
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| 347 | } |
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| 348 | s += sign*push; |
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| 349 | } |
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| 350 | } |
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| 351 | else { |
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| 352 | |
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| 353 | // |
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| 354 | // Record point |
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| 355 | // |
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| 356 | points.push_back( G4GeomTestPoint( p, s, entering==forward ) ); |
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[1347] | 357 | |
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[831] | 358 | } |
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| 359 | |
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| 360 | // |
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| 361 | // Find next intersection |
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| 362 | // |
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| 363 | if (entering) { |
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| 364 | dist = solid->DistanceToOut(p,vSearch); |
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| 365 | if (dist >= kInfinity) { |
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| 366 | logger->SolidProblem( solid, |
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| 367 | "DistanceToOut(p,v) = kInfinity for point inside", p ); |
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| 368 | return; |
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| 369 | } |
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| 370 | |
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| 371 | if ( (dist > kCarTolerance) |
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| 372 | && (solid->Inside(p + (dist*0.999)*vSearch) == kOutside) ) { |
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| 373 | // |
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| 374 | // This shouldn't have happened |
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| 375 | // |
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| 376 | if (solid->Inside(p) == kOutside) |
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| 377 | logger->SolidProblem(solid, |
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| 378 | "Entering point is outside (possible roundoff error)",p); |
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| 379 | else |
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| 380 | logger->SolidProblem(solid, |
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| 381 | "DistanceToOut(p,v) brings trajectory well outside solid",p); |
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| 382 | return; |
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| 383 | } |
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[1347] | 384 | |
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[831] | 385 | entering = false; |
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| 386 | } |
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| 387 | else { |
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| 388 | dist = solid->DistanceToIn(p,vSearch); |
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| 389 | if (dist >= kInfinity) return; |
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| 390 | |
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| 391 | if ( (dist > kCarTolerance) |
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| 392 | && (solid->Inside(p + (dist*0.999)*vSearch) == kInside) ) { |
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| 393 | // |
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| 394 | // This shouldn't have happened |
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| 395 | // |
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| 396 | if (solid->Inside(p) == kInside) |
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| 397 | logger->SolidProblem(solid, |
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| 398 | "Exiting point is inside (possible roundoff error)", p); |
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| 399 | else |
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| 400 | logger->SolidProblem(solid, |
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| 401 | "DistanceToIn(p,v) brings trajectory well inside solid", p); |
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| 402 | return; |
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| 403 | } |
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| 404 | |
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| 405 | entering = true; |
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| 406 | } |
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| 407 | |
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| 408 | // |
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| 409 | // Update s |
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| 410 | // |
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| 411 | if (dist <= 0) { |
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| 412 | nzero++; |
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| 413 | } |
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| 414 | else { |
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| 415 | nzero=0; |
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| 416 | s += sign*dist; |
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| 417 | } |
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| 418 | } |
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| 419 | } |
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