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: G4GeometryTolerance.hh,v 1.2 2007/06/18 13:26:40 gcosmo Exp $ |
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28 | // GEANT4 tag $Name: HEAD $ |
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29 | // |
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30 | // -------------------------------------------------------------------- |
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31 | // GEANT 4 class header file |
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32 | // |
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33 | // Class Description: |
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34 | // |
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35 | // A singleton class for computation and storage of the tolerance values |
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36 | // used by the geometry modeler for precision on boundaries. |
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37 | // The Cartesian tolerance defines the thickness of the surface of the |
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38 | // geometrical shapes for their inner funtions and for the tracking. The |
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39 | // tolerance must be greater than the largest mathematical error from the |
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40 | // shape distance calculation functions. The tolerance is centred on the |
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41 | // surface, e.g. the Inside() method of a solid uses a tolerance dx +/- kTol/2. |
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42 | // The Cartesian tolerance can either be set to a fixed value (1E-9 mm) |
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43 | // or to a value computed on the basis of the maximum extent of the |
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44 | // world volume assigned through the G4GeometryManager at the beginning |
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45 | // of the application -before- any geometrical object is created. |
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46 | |
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47 | // ---------------- G4GeometryTolerance ---------------- |
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48 | // |
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49 | // Author: G.Cosmo (CERN), October 2006 |
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50 | // ------------------------------------------------------------ |
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51 | |
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52 | #ifndef G4GeometryTolerance_hh |
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53 | #define G4GeometryTolerance_hh |
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54 | |
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55 | #include "G4Types.hh" |
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56 | |
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57 | class G4GeometryTolerance |
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58 | { |
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59 | friend class G4GeometryManager; |
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60 | |
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61 | public: // with description |
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62 | |
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63 | static G4GeometryTolerance* GetInstance(); |
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64 | // Get a pointer to the unique G4GeometryTolerance, |
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65 | // creating it if necessary and setting the tolerances. |
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66 | G4double GetSurfaceTolerance() const; |
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67 | // Returns the current Cartesian tolerance of a surface. |
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68 | G4double GetAngularTolerance() const; |
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69 | // Returns the current angular tolerance. |
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70 | G4double GetRadialTolerance() const; |
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71 | // Returns the current radial tolerance. |
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72 | |
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73 | protected: |
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74 | |
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75 | static void SetSurfaceTolerance(G4double worldExtent); |
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76 | // Sets the Cartesian surface tolerance to a value computed |
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77 | // from the maximum extent of the world volume. This method |
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78 | // can be called only once, and is done only through the |
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79 | // G4GeometryManager class. |
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80 | |
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81 | G4GeometryTolerance(); |
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82 | ~G4GeometryTolerance(); |
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83 | // Protected constructor and destructor. |
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84 | |
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85 | private: |
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86 | |
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87 | static G4GeometryTolerance* fInstance; |
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88 | static G4double fCarTolerance; |
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89 | static G4double fAngTolerance; |
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90 | static G4double fRadTolerance; |
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91 | static G4bool fInitialised; |
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92 | }; |
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93 | |
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94 | #endif // G4GeometryTolerance_hh |
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95 | |
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