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G4GeometryTolerance.hh
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27 // $Id: G4GeometryTolerance.hh 96427 2016-04-14 09:37:29Z gcosmo $
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29 // --------------------------------------------------------------------
30 // GEANT 4 class header file
31 //
32 // Class Description:
33 //
34 // A singleton class for computation and storage of the tolerance values
35 // used by the geometry modeler for precision on boundaries.
36 // The Cartesian tolerance defines the thickness of the surface of the
37 // geometrical shapes for their inner funtions and for the tracking. The
38 // tolerance must be greater than the largest mathematical error from the
39 // shape distance calculation functions. The tolerance is centred on the
40 // surface, e.g. the Inside() method of a solid uses a tolerance dx +/- kTol/2.
41 // The Cartesian tolerance can either be set to a fixed value (1E-9 mm)
42 // or to a value computed on the basis of the maximum extent of the
43 // world volume assigned through the G4GeometryManager at the beginning
44 // of the application -before- any geometrical object is created.
45 
46 // ---------------- G4GeometryTolerance ----------------
47 //
48 // Author: G.Cosmo (CERN), October 2006
49 // ------------------------------------------------------------
50 
51 #ifndef G4GeometryTolerance_hh
52 #define G4GeometryTolerance_hh
53 
54 #include "G4Types.hh"
55 
57 {
58  friend class G4GeometryManager;
59 
60  public: // with description
61 
63  // Get a pointer to the unique G4GeometryTolerance,
64  // creating it if necessary and setting the tolerances.
66  // Returns the current Cartesian tolerance of a surface.
68  // Returns the current angular tolerance.
70  // Returns the current radial tolerance.
71 
72  public: // without description
73 
75  // Destructor.
76 
77  protected:
78 
79  void SetSurfaceTolerance(G4double worldExtent);
80  // Sets the Cartesian and Radial surface tolerance to a value computed
81  // from the maximum extent of the world volume. This method
82  // can be called only once, and is done only through the
83  // G4GeometryManager class.
84 
86  // Protected constructor.
87 
88  private:
89 
90  static G4ThreadLocal G4GeometryTolerance* fpInstance;
91  G4double fCarTolerance;
92  G4double fAngTolerance;
93  G4double fRadTolerance;
94  G4bool fInitialised;
95  };
96 
97 #endif // G4GeometryTolerance_hh
98 
G4double GetSurfaceTolerance() const
#define G4ThreadLocal
Definition: tls.hh:89
G4double GetRadialTolerance() const
bool G4bool
Definition: G4Types.hh:79
double G4double
Definition: G4Types.hh:76
void SetSurfaceTolerance(G4double worldExtent)
G4double GetAngularTolerance() const
static G4GeometryTolerance * GetInstance()