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1 //
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25 //
26 // class G4ErrorPropagationNavigator
27 //
28 // Class Description:
29 //
30 // Class for performing double navigation in the detector geometry and
31 // on the target surface for error propagation. It overloads ComputeStep()
32 // and ComputeSafety() methods.
33
34 // Created. P. Arce, September 2004
35 // --------------------------------------------------------------------
36
37 #ifndef G4ErrorPropagationNavigator_hh
38 #define G4ErrorPropagationNavigator_hh 1
39
40 #include "G4Navigator.hh"
41 #include "G4ThreeVector.hh"
42
43 class G4ErrorPropagationNavigator : public G4Navigator
44 {
45 public:
46
47 G4ErrorPropagationNavigator() = default;
48 ~G4ErrorPropagationNavigator() override = default;
49
50 G4double ComputeStep (const G4ThreeVector &pGlobalPoint,
51 const G4ThreeVector &pDirection,
52 const G4double pCurrentProposedStepLength,
53 G4double &pNewSafety) override;
54 // Calls the navigation in the detector geometry and then checks
55 // if the distance to surface is smaller than the proposed step
56
57 G4double ComputeSafety(const G4ThreeVector &globalpoint,
58 const G4double pProposedMaxLength = DBL_MAX,
59 const G4bool keepState = true) override;
60 // Calls the navigation in the detector geometry and then checks
61 // if the distance to surface is smaller than the proposed safety
62
63 G4ThreeVector GetGlobalExitNormal(const G4ThreeVector& point,
64 G4bool* valid) override;
65 // Return Exit Surface Normal and validity too. Can only be called if
66 // the Navigator's last Step has crossed a volume geometrical boundary.
67 // Normal points out of the volume exited and/or into the volume entered.
68
69 G4double TargetSafetyFromPoint( const G4ThreeVector &pGlobalpoint );
70 // Isotropic safety for 'Target'
71
72 //-- NOT implemented, as it is difficult to define the coordinate system:
73 // G4ThreeVector GetLocalExitNormal(G4bool* valid);
74 // G4ThreeVector GetLocalExitNormalAndCheck(const G4ThreeVector& point,
75 // G4bool* valid);
76 // Convention:
77 // The *local* normal is in the coordinate system of the *final* volume.
78 };
79
80 #endif
81