management/include/G4GeometryTolerance.hh

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0025 //
0026 // G4GeometryTolerance
0027 //
0028 // Class description:
0029 //
0030 // A singleton class for computation and storage of the tolerance values
0031 // used by the geometry modeler for precision on boundaries.
0032 // The Cartesian tolerance defines the thickness of the surface of the
0033 // geometrical shapes for their inner funtions and for the tracking. The
0034 // tolerance must be greater than the largest mathematical error from the
0035 // shape distance calculation functions. The tolerance is centred on the
0036 // surface, e.g. the Inside() method of a solid uses a tolerance dx +/- kTol/2.
0037 // The Cartesian tolerance can either be set to a fixed value (1E-9 mm)
0038 // or to a value computed on the basis of the maximum extent of the
0039 // world volume assigned through the G4GeometryManager at the beginning
0040 // of the application -before- any geometrical object is created.
0041
0042 //      ---------------- G4GeometryTolerance ----------------
0043 //
0044 // Author: G.Cosmo (CERN), 30 October 2006
0045 // --------------------------------------------------------------------
0046 #ifndef G4GeometryTolerance_hh
0047 #define G4GeometryTolerance_hh
0048
0049 #include "G4Types.hh"
0050
0051 class G4GeometryTolerance
0052 {
0053   friend class G4GeometryManager;
0054
0055  public:  // with description
0056   static G4GeometryTolerance* GetInstance();
0057   // Get a pointer to the unique G4GeometryTolerance,
0058   // creating it if necessary and setting the tolerances.
0059   G4double GetSurfaceTolerance() const;
0060   // Returns the current Cartesian tolerance of a surface.
0061   G4double GetAngularTolerance() const;
0062   // Returns the current angular tolerance.
0063   G4double GetRadialTolerance() const;
0064   // Returns the current radial tolerance.
0065
0066  public:  // without description
0067   ~G4GeometryTolerance() = default;
0068   // Destructor.
0069
0070  protected:
0071   void SetSurfaceTolerance(G4double worldExtent);
0072   // Sets the Cartesian and Radial surface tolerance to a value computed
0073   // from the maximum extent of the world volume. This method
0074   // can be called only once, and is done only through the
0075   // G4GeometryManager class.
0076
0077   G4GeometryTolerance();
0078   // Protected constructor.
0079
0080  private:
0081   static G4ThreadLocal G4GeometryTolerance* fpInstance;
0082   G4double fCarTolerance;
0083   G4double fAngTolerance;
0084   G4double fRadTolerance;
0085   G4bool fInitialised = false;
0086 };
0087
0088 #endif