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1 //
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25 //
26 // G4GeometryTolerance
27 //
28 // Class description:
29 //
30 // A singleton class for computation and storage of the tolerance values
31 // used by the geometry modeler for precision on boundaries.
32 // The Cartesian tolerance defines the thickness of the surface of the
33 // geometrical shapes for their inner funtions and for the tracking. The
34 // tolerance must be greater than the largest mathematical error from the
35 // shape distance calculation functions. The tolerance is centred on the
36 // surface, e.g. the Inside() method of a solid uses a tolerance dx +/- kTol/2.
37 // The Cartesian tolerance can either be set to a fixed value (1E-9 mm)
38 // or to a value computed on the basis of the maximum extent of the
39 // world volume assigned through the G4GeometryManager at the beginning
40 // of the application -before- any geometrical object is created.
41
42 // ---------------- G4GeometryTolerance ----------------
43 //
44 // Author: G.Cosmo (CERN), 30 October 2006
45 // --------------------------------------------------------------------
46 #ifndef G4GeometryTolerance_hh
47 #define G4GeometryTolerance_hh
48
49 #include "G4Types.hh"
50
51 class G4GeometryTolerance
52 {
53 friend class G4GeometryManager;
54
55 public: // with description
56 static G4GeometryTolerance* GetInstance();
57 // Get a pointer to the unique G4GeometryTolerance,
58 // creating it if necessary and setting the tolerances.
59 G4double GetSurfaceTolerance() const;
60 // Returns the current Cartesian tolerance of a surface.
61 G4double GetAngularTolerance() const;
62 // Returns the current angular tolerance.
63 G4double GetRadialTolerance() const;
64 // Returns the current radial tolerance.
65
66 public: // without description
67 ~G4GeometryTolerance() = default;
68 // Destructor.
69
70 protected:
71 void SetSurfaceTolerance(G4double worldExtent);
72 // Sets the Cartesian and Radial surface tolerance to a value computed
73 // from the maximum extent of the world volume. This method
74 // can be called only once, and is done only through the
75 // G4GeometryManager class.
76
77 G4GeometryTolerance();
78 // Protected constructor.
79
80 private:
81 static G4ThreadLocal G4GeometryTolerance* fpInstance;
82 G4double fCarTolerance;
83 G4double fAngTolerance;
84 G4double fRadTolerance;
85 G4bool fInitialised = false;
86 };
87
88 #endif
89