include/Geant4/G4ErrorPropagationNavigator.hh

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0025 //
0026 // class G4ErrorPropagationNavigator
0027 //
0028 // Class Description:
0029 //
0030 // Class for performing double navigation in the detector geometry and
0031 // on the target surface for error propagation. It overloads ComputeStep()
0032 // and ComputeSafety() methods.
0033
0034 // Created. P. Arce, September 2004
0035 // --------------------------------------------------------------------
0036
0037 #ifndef G4ErrorPropagationNavigator_hh
0038 #define G4ErrorPropagationNavigator_hh 1
0039
0040 #include "G4Navigator.hh"
0041 #include "G4ThreeVector.hh"
0042
0043 class G4ErrorPropagationNavigator : public G4Navigator
0044 {
0045   public:
0046
0047     G4ErrorPropagationNavigator() = default;
0048    ~G4ErrorPropagationNavigator() override = default;
0049
0050     G4double ComputeStep (const G4ThreeVector &pGlobalPoint,
0051                           const G4ThreeVector &pDirection,
0052                           const G4double pCurrentProposedStepLength,
0053                                 G4double &pNewSafety) override;
0054       // Calls the navigation in the detector geometry and then checks
0055       // if the distance to surface is smaller than the proposed step
0056
0057     G4double ComputeSafety(const G4ThreeVector &globalpoint,
0058                            const G4double pProposedMaxLength = DBL_MAX,
0059                            const G4bool keepState = true) override;
0060       // Calls the navigation in the detector geometry and then checks
0061       // if the distance to surface is smaller than the proposed safety
0062
0063     G4ThreeVector GetGlobalExitNormal(const G4ThreeVector& point,
0064                                             G4bool* valid) override;
0065       // Return Exit Surface Normal and validity too. Can only be called if
0066       // the Navigator's last Step has crossed a volume geometrical boundary.
0067       // Normal points out of the volume exited and/or into the volume entered.
0068
0069     G4double TargetSafetyFromPoint( const G4ThreeVector &pGlobalpoint );
0070       // Isotropic safety for 'Target'
0071
0072     //-- NOT implemented, as it is difficult to define the coordinate system:
0073     // G4ThreeVector GetLocalExitNormal(G4bool* valid);
0074     // G4ThreeVector GetLocalExitNormalAndCheck(const G4ThreeVector& point,
0075     //                                               G4bool* valid);
0076     // Convention:
0077     //   The *local* normal is in the coordinate system of the *final* volume.
0078 };
0079
0080 #endif