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 // History:
0035 // - Created. P. Arce, September 2004
0036 // --------------------------------------------------------------------
0037
0038 #ifndef G4ErrorPropagationNavigator_hh
0039 #define G4ErrorPropagationNavigator_hh
0040
0041 #include "G4Navigator.hh"
0042 #include "G4ThreeVector.hh"
0043
0044 class G4ErrorPropagationNavigator : public G4Navigator
0045 {
0046   public:  // with description
0047
0048     G4ErrorPropagationNavigator();
0049    ~G4ErrorPropagationNavigator() override;
0050
0051     G4double ComputeStep (const G4ThreeVector &pGlobalPoint,
0052                           const G4ThreeVector &pDirection,
0053                           const G4double pCurrentProposedStepLength,
0054                                 G4double &pNewSafety) override;
0055       // Calls the navigation in the detector geometry and then checks
0056       // if the distance to surface is smaller than the proposed step
0057
0058     G4double ComputeSafety(const G4ThreeVector &globalpoint,
0059                            const G4double pProposedMaxLength = DBL_MAX,
0060                            const G4bool keepState = true) override;
0061       // Calls the navigation in the detector geometry and then checks
0062       // if the distance to surface is smaller than the proposed safety
0063
0064     G4ThreeVector GetGlobalExitNormal(const G4ThreeVector& point,
0065                                             G4bool* valid) override;
0066       // Return Exit Surface Normal and validity too. Can only be called if
0067       // the Navigator's last Step has crossed a volume geometrical boundary.
0068       // Normal points out of the volume exited and/or into the volume entered.
0069
0070     G4double TargetSafetyFromPoint( const G4ThreeVector &pGlobalpoint );
0071       // Isotropic safety for 'Target'
0072
0073     //-- NOT implemented, as it is difficult to define the coordinate system:
0074     // G4ThreeVector GetLocalExitNormal(G4bool* valid);
0075     // G4ThreeVector GetLocalExitNormalAndCheck(const G4ThreeVector& point,
0076     //                                               G4bool* valid);
0077     // Convention:
0078     //   The *local* normal is in the coordinate system of the *final* volume.
0079 };
0080
0081 #endif