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 | // $Id: G4PolyPhiFace.icc,v 1.6 2006/06/29 18:47:10 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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29 | // |
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30 | // |
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31 | // -------------------------------------------------------------------- |
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32 | // GEANT 4 inline definitions file |
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33 | // |
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34 | // G4PolyPhiFace.icc |
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35 | // |
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36 | // Implementation of inline methods of G4PolyPhiFace |
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37 | // -------------------------------------------------------------------- |
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38 | |
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39 | inline |
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40 | G4VCSGface* G4PolyPhiFace::Clone() |
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41 | { |
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42 | return new G4PolyPhiFace(*this); |
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43 | } |
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44 | |
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45 | // ExactZOrder |
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46 | // |
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47 | // Decide precisely whether a trajectory passes to the left, right, or exactly |
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48 | // passes through the z position of a vertex point in our face. |
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49 | // |
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50 | // Result is only determined within an arbitrary (positive) factor. |
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51 | // > 0 to the right |
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52 | // < 0 to the left |
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53 | // = 0 exactly on top of |
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54 | // In 99.9999% of the cases, a trivial calculation is used. In difficult |
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55 | // cases, a precise, compliant calculation is relied on. |
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56 | // |
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57 | inline |
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58 | G4double G4PolyPhiFace::ExactZOrder( G4double z, |
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59 | G4double qx, G4double qy, G4double qz, |
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60 | const G4ThreeVector &v, |
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61 | G4double normSign, |
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62 | const G4PolyPhiFaceVertex *vert ) const |
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63 | { |
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64 | G4double answer = vert->z - z; |
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65 | if (std::fabs(answer) < kCarTolerance) |
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66 | { |
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67 | G4ThreeVector qa( qx - vert->x + radial.x(), |
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68 | qy - vert->y + radial.y(), qz - vert->z ), |
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69 | qb( qx - vert->x, qy - vert->y, qz - vert->z ); |
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70 | G4ThreeVector qacb = qa.cross(qb); |
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71 | |
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72 | answer = normSign*qacb.dot(v)*(normal.y()*radial.x()-normal.x()*radial.y()); |
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73 | } |
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74 | |
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75 | return answer; |
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76 | } |
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