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G4GeometryTolerance.hh
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28 // --------------------------------------------------------------------
29 // GEANT 4 class header file
30 //
31 // Class Description:
32 //
33 // A singleton class for computation and storage of the tolerance values
34 // used by the geometry modeler for precision on boundaries.
35 // The Cartesian tolerance defines the thickness of the surface of the
36 // geometrical shapes for their inner funtions and for the tracking. The
37 // tolerance must be greater than the largest mathematical error from the
38 // shape distance calculation functions. The tolerance is centred on the
39 // surface, e.g. the Inside() method of a solid uses a tolerance dx +/- kTol/2.
40 // The Cartesian tolerance can either be set to a fixed value (1E-9 mm)
41 // or to a value computed on the basis of the maximum extent of the
42 // world volume assigned through the G4GeometryManager at the beginning
43 // of the application -before- any geometrical object is created.
44 
45 // ---------------- G4GeometryTolerance ----------------
46 //
47 // Author: G.Cosmo (CERN), October 2006
48 // ------------------------------------------------------------
49 
50 #ifndef G4GeometryTolerance_hh
51 #define G4GeometryTolerance_hh
52 
53 #include "G4Types.hh"
54 
56 {
57  friend class G4GeometryManager;
58 
59  public: // with description
60 
62  // Get a pointer to the unique G4GeometryTolerance,
63  // creating it if necessary and setting the tolerances.
65  // Returns the current Cartesian tolerance of a surface.
67  // Returns the current angular tolerance.
69  // Returns the current radial tolerance.
70 
71  public: // without description
72 
74  // Destructor.
75 
76  protected:
77 
78  void SetSurfaceTolerance(G4double worldExtent);
79  // Sets the Cartesian and Radial surface tolerance to a value computed
80  // from the maximum extent of the world volume. This method
81  // can be called only once, and is done only through the
82  // G4GeometryManager class.
83 
85  // Protected constructor.
86 
87  private:
88 
94  };
95 
96 #endif // G4GeometryTolerance_hh
97