[831] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // $Id: G4PathFinder.hh,v 1.34 2007/11/02 12:28:31 japost Exp $ |
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[921] | 27 | // GEANT4 tag $Name: geant4-09-02-cand-01 $ |
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[831] | 28 | // |
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| 29 | // class G4PathFinder |
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| 30 | // |
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| 31 | // Class description: |
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| 32 | // |
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| 33 | // This class directs the lock-stepped propagation of a track in the |
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| 34 | // 'mass' and other parallel geometries. It ensures that tracking |
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| 35 | // in a magnetic field sees these parallel geometries at each trial step, |
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| 36 | // and that the earliest boundary limits the step. |
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| 37 | // |
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| 38 | // For the movement in field, it relies on the class G4PropagatorInField |
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| 39 | // |
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| 40 | // History: |
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| 41 | // ------- |
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| 42 | // 7.10.05 John Apostolakis, Draft design |
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| 43 | // 26.04.06 John Apostolakis, Revised design and first implementation |
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| 44 | // --------------------------------------------------------------------------- |
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| 45 | #ifndef G4PATHFINDER_HH |
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| 46 | #define G4PATHFINDER_HH 1 |
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| 47 | |
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| 48 | #include <vector> |
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| 49 | #include "G4Types.hh" |
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| 50 | |
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| 51 | #include "G4FieldTrack.hh" |
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| 52 | |
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| 53 | class G4TransportationManager; |
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| 54 | class G4Navigator; |
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| 55 | |
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| 56 | #include "G4TouchableHandle.hh" |
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| 57 | #include "G4FieldTrack.hh" |
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| 58 | #include "G4MultiNavigator.hh" |
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| 59 | |
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| 60 | class G4PropagatorInField; |
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| 61 | |
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| 62 | class G4PathFinder |
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| 63 | { |
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| 64 | |
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| 65 | public: // with description |
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| 66 | |
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| 67 | static G4PathFinder* GetInstance(); |
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| 68 | // |
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| 69 | // Retrieve singleton instance |
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| 70 | |
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| 71 | G4double ComputeStep( const G4FieldTrack &pFieldTrack, |
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| 72 | G4double pCurrentProposedStepLength, |
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| 73 | G4int navigatorId, // Identifies the geometry |
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| 74 | G4int stepNo, // See next step/check |
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| 75 | G4double &pNewSafety, // Only for this geometry |
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| 76 | ELimited &limitedStep, |
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| 77 | G4FieldTrack &EndState, |
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| 78 | G4VPhysicalVolume* currentVolume ); |
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| 79 | // |
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| 80 | // Compute the next geometric Step -- Curved or linear |
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| 81 | // If it is called with a larger 'stepNo' it will execute a new step; |
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| 82 | // if 'stepNo' is same as last call, then the results for |
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| 83 | // the geometry with Id. number 'navigatorId' will be returned. |
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| 84 | |
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| 85 | void Locate( const G4ThreeVector& position, |
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| 86 | const G4ThreeVector& direction, |
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| 87 | G4bool relativeSearch=true); |
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| 88 | // |
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| 89 | // Make primary relocation of global point in all navigators, |
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| 90 | // and update them. |
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| 91 | |
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| 92 | void ReLocate( const G4ThreeVector& position ); |
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| 93 | // |
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| 94 | // Make secondary relocation of global point (within safety only) |
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| 95 | // in all navigators, and update them. |
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| 96 | |
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| 97 | void PrepareNewTrack( const G4ThreeVector& position, |
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| 98 | const G4ThreeVector& direction, |
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| 99 | G4VPhysicalVolume* massStartVol=0); |
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| 100 | // |
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| 101 | // Check and cache set of active navigators. |
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| 102 | |
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| 103 | G4TouchableHandle CreateTouchableHandle( G4int navId ) const; |
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| 104 | inline G4VPhysicalVolume* GetLocatedVolume( G4int navId ) const; |
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| 105 | |
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| 106 | // ----------------------------------------------------------------- |
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| 107 | |
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| 108 | inline void SetChargeMomentumMass( G4double charge, // in e+ units |
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| 109 | G4double momentum, // in Geant4 units |
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| 110 | G4double pMass ); |
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| 111 | |
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| 112 | inline G4bool IsParticleLooping() const; |
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| 113 | |
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| 114 | inline G4double GetCurrentSafety() const; |
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| 115 | // Minimum value of safety after last ComputeStep |
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| 116 | inline G4double GetMinimumStep() const; |
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| 117 | // Get the minimum step size from the last ComputeStep call |
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| 118 | // - in case full step is taken, this is kInfinity |
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| 119 | inline unsigned int GetNumberGeometriesLimitingStep() const; |
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| 120 | |
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| 121 | G4double ComputeSafety( const G4ThreeVector& globalPoint); |
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| 122 | // Recompute safety for the relevant point the endpoint of the last step!! |
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| 123 | // Maintain vector of individual safety values (for next method) |
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| 124 | |
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| 125 | G4double ObtainSafety( G4int navId, G4ThreeVector& globalCenterPoint ); |
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| 126 | // Obtain safety for navigator/geometry navId for last point 'computed' |
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| 127 | // --> last point for which ComputeSafety was called |
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| 128 | // Returns the point (center) for which this safety is valid |
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| 129 | |
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| 130 | void EnableParallelNavigation( G4bool enableChoice=true ); |
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| 131 | // |
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| 132 | // Must call it to ensure that PathFinder is prepared, |
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| 133 | // especially for curved tracks. If true it switches PropagatorInField |
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| 134 | // to use MultiNavigator. Must call it with false to undo (=PiF use |
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| 135 | // Navigator for tracking!) |
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| 136 | |
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| 137 | inline G4int SetVerboseLevel(G4int lev=-1); |
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| 138 | |
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| 139 | public: // with description |
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| 140 | |
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| 141 | inline G4int GetMaxLoopCount() const; |
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| 142 | inline void SetMaxLoopCount( G4int new_max ); |
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| 143 | // |
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| 144 | // A maximum for the number of steps that a (looping) particle can take. |
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| 145 | |
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| 146 | public: // without description |
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| 147 | |
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| 148 | inline void MovePoint(); |
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| 149 | // |
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| 150 | // Signal that location will be moved -- internal use primarily |
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| 151 | |
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| 152 | // To provide best compatibility between Coupled and Old Transportation |
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| 153 | // the next two methods are provided: |
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| 154 | G4double LastPreSafety( G4int navId, G4ThreeVector& globalCenterPoint, G4double& minSafety ); |
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| 155 | // Obtain last safety needed in ComputeStep (for geometry navId) |
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| 156 | // --> last point at which ComputeStep recalculated safety |
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| 157 | // Returns the point (center) for which this safety is valid |
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| 158 | // and also the minimum safety over all navigators (ie full) |
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| 159 | |
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| 160 | void PushPostSafetyToPreSafety(); |
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| 161 | // Tell PathFinder to copy PostStep Safety to PreSafety (for use at next step) |
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| 162 | |
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| 163 | G4String& LimitedString( ELimited lim ); |
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| 164 | // Convert ELimited to string |
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| 165 | |
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| 166 | protected: // without description |
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| 167 | |
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| 168 | G4double DoNextLinearStep( const G4FieldTrack &FieldTrack, |
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| 169 | G4double proposedStepLength); |
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| 170 | |
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| 171 | G4double DoNextCurvedStep( const G4FieldTrack &FieldTrack, |
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| 172 | G4double proposedStepLength, |
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| 173 | G4VPhysicalVolume* pCurrentPhysVolume); |
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| 174 | |
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| 175 | void WhichLimited(); |
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| 176 | void PrintLimited(); |
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| 177 | // |
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| 178 | // Print key details out - for debugging |
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| 179 | |
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| 180 | // void ClearState(); |
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| 181 | // |
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| 182 | // Clear all the State of this class and its current associates |
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| 183 | |
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| 184 | inline G4bool UseSafetyForOptimization( G4bool ); |
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| 185 | // |
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| 186 | // Whether use safety to discard unneccesary calls to navigator |
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| 187 | |
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| 188 | void ReportMove( const G4ThreeVector& OldV, const G4ThreeVector& NewV, const G4String& Quantity ) const; |
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| 189 | // Helper method to report movement (likely of initial point) |
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| 190 | |
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| 191 | protected: |
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| 192 | |
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| 193 | G4PathFinder(); // Singleton |
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| 194 | ~G4PathFinder(); |
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| 195 | |
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| 196 | inline G4Navigator* GetNavigator(G4int n) const; |
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| 197 | |
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| 198 | private: |
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| 199 | |
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| 200 | // ---------------------------------------------------------------------- |
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| 201 | // DATA Members |
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| 202 | // ---------------------------------------------------------------------- |
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| 203 | |
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| 204 | G4MultiNavigator *fpMultiNavigator; |
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| 205 | // |
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| 206 | // Object that enables G4PropagatorInField to see many geometries |
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| 207 | |
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| 208 | G4int fNoActiveNavigators; |
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| 209 | G4bool fNewTrack; // Flag a new track (ensure first step) |
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| 210 | |
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| 211 | static const G4int fMaxNav = 8; // rename to kMaxNoNav ?? |
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| 212 | |
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| 213 | // Global state (retained during stepping for one track) |
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| 214 | |
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| 215 | G4Navigator* fpNavigator[fMaxNav]; |
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| 216 | |
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| 217 | // State changed in a step computation |
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| 218 | |
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| 219 | ELimited fLimitedStep[fMaxNav]; |
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| 220 | G4bool fLimitTruth[fMaxNav]; |
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| 221 | G4double fCurrentStepSize[fMaxNav]; |
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| 222 | G4int fNoGeometriesLimiting; // How many processes contribute to limit |
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| 223 | |
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| 224 | G4ThreeVector fPreSafetyLocation; // last initial position for which safety evaluated |
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| 225 | G4double fPreSafetyMinValue; // /\ corresponding value of full safety |
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| 226 | G4double fPreSafetyValues[ fMaxNav ]; // Safeties for the above point |
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| 227 | // This part of the state can be retained for severall calls --> CARE |
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| 228 | |
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| 229 | G4ThreeVector fPreStepLocation; // point where last ComputeStep called |
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| 230 | G4double fMinSafety_PreStepPt; // /\ corresponding value of full safety |
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| 231 | G4double fCurrentPreStepSafety[ fMaxNav ]; // Safeties for the above point |
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| 232 | // This changes at each step, |
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| 233 | // so it can differ when steps inside min-safety are made |
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| 234 | |
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| 235 | G4bool fPreStepCenterRenewed; // Whether PreSafety coincides with PreStep point |
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| 236 | |
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| 237 | G4double fMinStep; // As reported by Navigators -- can be kInfinity |
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| 238 | G4double fTrueMinStep; // Corrected in case >= proposed |
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| 239 | |
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| 240 | // State after calling 'locate' |
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| 241 | |
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| 242 | G4VPhysicalVolume* fLocatedVolume[fMaxNav]; |
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| 243 | G4ThreeVector fLastLocatedPosition; |
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| 244 | |
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| 245 | // State after calling 'ComputeStep' (others member variables will be affected) |
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| 246 | G4FieldTrack fEndState; // Point, velocity, ... at proposed step end |
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| 247 | G4bool fFieldExertedForce; // In current proposed step |
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| 248 | |
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| 249 | G4bool fRelocatedPoint; // Signals that point was or is being moved |
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| 250 | // from the position of the last location |
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| 251 | // or the endpoint resulting from ComputeStep |
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| 252 | // -- invalidates fEndState |
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| 253 | |
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| 254 | // State for 'ComputeSafety' and related methods |
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| 255 | G4ThreeVector fSafetyLocation; // point where ComputeSafety is called |
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| 256 | G4double fMinSafety_atSafLocation; // /\ corresponding value of safety |
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| 257 | G4double fNewSafetyComputed[ fMaxNav ]; // Safeties for last ComputeSafety |
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| 258 | |
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| 259 | // State for Step numbers |
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| 260 | G4int fLastStepNo, fCurrentStepNo; |
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| 261 | G4bool fParticleIsLooping; |
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| 262 | |
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| 263 | G4int fVerboseLevel; // For debuging purposes |
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| 264 | |
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| 265 | G4int fMax_loop_count; |
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| 266 | // Limit for the number of sub-steps taken in one call to ComputeStep |
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| 267 | |
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| 268 | G4TransportationManager* fpTransportManager; // Cache for frequent use |
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| 269 | G4PropagatorInField* fpFieldPropagator; |
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| 270 | |
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| 271 | G4double kCarTolerance; |
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| 272 | |
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| 273 | static G4PathFinder* fpPathFinder; |
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| 274 | }; |
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| 275 | |
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| 276 | // ******************************************************************** |
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| 277 | // Inline methods. |
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| 278 | // ******************************************************************** |
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| 279 | |
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| 280 | inline G4VPhysicalVolume* G4PathFinder::GetLocatedVolume( G4int navId ) const |
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| 281 | { |
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| 282 | G4VPhysicalVolume* vol=0; |
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| 283 | if( (navId < fMaxNav) && (navId >=0) ) { vol= fLocatedVolume[navId]; } |
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| 284 | return vol; |
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| 285 | } |
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| 286 | |
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| 287 | inline G4int G4PathFinder::SetVerboseLevel(G4int newLevel) |
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| 288 | { |
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| 289 | G4int old= fVerboseLevel; fVerboseLevel= newLevel; return old; |
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| 290 | } |
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| 291 | |
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| 292 | inline G4double G4PathFinder::GetMinimumStep() const |
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| 293 | { |
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| 294 | return fMinStep; |
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| 295 | } |
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| 296 | |
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| 297 | inline unsigned int G4PathFinder::GetNumberGeometriesLimitingStep() const |
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| 298 | { |
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| 299 | unsigned int noGeometries=fNoGeometriesLimiting; |
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| 300 | return noGeometries; |
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| 301 | } |
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| 302 | |
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| 303 | inline G4double G4PathFinder::GetCurrentSafety() const |
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| 304 | { |
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| 305 | return fMinSafety_PreStepPt; |
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| 306 | } |
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| 307 | |
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| 308 | inline void G4PathFinder::MovePoint() |
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| 309 | { |
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| 310 | fRelocatedPoint= true; |
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| 311 | } |
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| 312 | |
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| 313 | inline G4Navigator* G4PathFinder::GetNavigator(G4int n) const |
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| 314 | { |
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| 315 | if( (n>fNoActiveNavigators)||(n<0)) { n=0; } |
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| 316 | return fpNavigator[n]; |
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| 317 | } |
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| 318 | |
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| 319 | inline G4double G4PathFinder::ObtainSafety( G4int navId, G4ThreeVector& globalCenterPoint ) |
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| 320 | { |
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| 321 | globalCenterPoint= fSafetyLocation; |
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| 322 | // navId = std::min( navId, fMaxNav-1 ); |
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| 323 | return fNewSafetyComputed[ navId ]; |
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| 324 | } |
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| 325 | |
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| 326 | inline G4double G4PathFinder::LastPreSafety( G4int navId, |
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| 327 | G4ThreeVector& globalCenterPoint, |
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| 328 | G4double& minSafety ) |
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| 329 | { |
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| 330 | globalCenterPoint= fPreSafetyLocation; |
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| 331 | minSafety= fPreSafetyMinValue; |
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| 332 | // navId = std::min( navId, fMaxNav-1 ); |
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| 333 | return fPreSafetyValues[ navId ]; |
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| 334 | } |
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| 335 | #endif |
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