G4GeometryTolerance.hh

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00027 // $Id$
00028 //
00029 // --------------------------------------------------------------------
00030 // GEANT 4 class header file 
00031 //
00032 // Class Description:
00033 //
00034 // A singleton class for computation and storage of the tolerance values
00035 // used by the geometry modeler for precision on boundaries.
00036 // The Cartesian tolerance defines the thickness of the surface of the
00037 // geometrical shapes for their inner funtions and for the tracking. The
00038 // tolerance must be greater than the largest mathematical error from the
00039 // shape distance calculation functions. The tolerance is centred on the
00040 // surface, e.g. the Inside() method of a solid uses a tolerance dx +/- kTol/2.
00041 // The Cartesian tolerance can either be set to a fixed value (1E-9 mm)
00042 // or to a value computed on the basis of the maximum extent of the
00043 // world volume assigned through the G4GeometryManager at the beginning
00044 // of the application -before- any geometrical object is created.
00045 
00046 //      ---------------- G4GeometryTolerance ----------------
00047 //
00048 // Author: G.Cosmo (CERN), October 2006
00049 // ------------------------------------------------------------
00050 
00051 #ifndef G4GeometryTolerance_hh
00052 #define G4GeometryTolerance_hh
00053 
00054 #include "G4Types.hh"
00055 
00056 class G4GeometryTolerance
00057 {
00058   friend class G4GeometryManager;
00059 
00060   public:  // with description
00061 
00062     static G4GeometryTolerance* GetInstance();
00063       // Get a pointer to the unique G4GeometryTolerance,
00064       // creating it if necessary and setting the tolerances.
00065     G4double GetSurfaceTolerance() const;
00066       // Returns the current Cartesian tolerance of a surface.
00067     G4double GetAngularTolerance() const;
00068       // Returns the current angular tolerance.
00069     G4double GetRadialTolerance() const;
00070       // Returns the current radial tolerance.
00071 
00072   protected:
00073 
00074     static void SetSurfaceTolerance(G4double worldExtent);
00075       // Sets the Cartesian surface tolerance to a value computed
00076       // from the maximum extent of the world volume. This method
00077       // can be called only once, and is done only through the
00078       // G4GeometryManager class.
00079 
00080     G4GeometryTolerance();
00081     ~G4GeometryTolerance();
00082       // Protected constructor and destructor.
00083 
00084   private:
00085 
00086     static G4GeometryTolerance* fInstance;
00087     static G4double fCarTolerance;
00088     static G4double fAngTolerance;
00089     static G4double fRadTolerance;
00090     static G4bool fInitialised;
00091  };
00092 
00093 #endif // G4GeometryTolerance_hh
00094 

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