Gabriele Cosmo
109 lines
5.0 KiB
C++
109 lines
5.0 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4ErrorPropagationNavigator
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//
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// Class Description:
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//
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// Class for performing double navigation in the detector geometry and
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// on the target surface for error propagation. It overloads ComputeStep()
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// and ComputeSafety() methods.
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// Author: Pedro Arce (CIEMAT), September 2004
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// --------------------------------------------------------------------
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#ifndef G4ErrorPropagationNavigator_hh
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#define G4ErrorPropagationNavigator_hh 1
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#include "G4Navigator.hh"
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#include "G4ThreeVector.hh"
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/**
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* @brief G4ErrorPropagationNavigator is a class for performing double
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* navigation in the detector geometry and on the target surface for error
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* propagation. It overloads ComputeStep() and ComputeSafety() methods.
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*/
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class G4ErrorPropagationNavigator : public G4Navigator
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{
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public:
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/**
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* Constructor and Destructor.
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*/
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G4ErrorPropagationNavigator() = default;
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~G4ErrorPropagationNavigator() override = default;
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/**
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* Calls the navigation in the detector geometry and then checks
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* if the distance to surface is smaller than the proposed step.
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* @param[in] pGlobalPoint The point in global coordinates system.
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* @param[in] pDirection The normalised vector direction.
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* @param[in] pCurrentProposedStepLength Current proposed step length.
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* @param[in,out] newSafety New safety.
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* @returns Length from current point to next boundary surface along
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* @p pDirection.
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*/
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G4double ComputeStep (const G4ThreeVector& pGlobalPoint,
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const G4ThreeVector& pDirection,
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const G4double pCurrentProposedStepLength,
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G4double &pNewSafety) override;
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/**
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* Calls the navigation in the detector geometry and then checks
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* if the distance to surface is smaller than the proposed safety.
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* @param[in] globalpoint The point in global coordinates system.
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* The point must be within the current volume.
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* @param[in] pProposedMaxLength The proposed maximum length is used
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* to avoid volume safety calculations.
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* @param[in] keepState Flag to instruct keeping the state (default true)
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* to ensure minimum side effects from the call.
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* @returns Length from current point to closest boundary surface.
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* The value returned is usually an underestimate.
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*/
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G4double ComputeSafety(const G4ThreeVector& globalpoint,
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const G4double pProposedMaxLength = DBL_MAX,
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const G4bool keepState = true) override;
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/**
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* Returns Exit Surface Normal and validity too. Can only be called if
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* the Navigator's last Step has crossed a volume geometrical boundary.
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* Normal points out of the volume exited and/or into the volume entered.
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* @param[in] point Point in global coordinates system to compare to.
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* @param[in,out] valid Flag indicating if normal is valid.
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* @returns A Exit Surface Normal vector and validity too.
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*/
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G4ThreeVector GetGlobalExitNormal(const G4ThreeVector& point,
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G4bool* valid) override;
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/**
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* Computes the isotropic safety for 'Target'.
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* @param[in] pGlobalpoint Point in global coordinates system.
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* @returns The isotropic safety value.
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*/
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G4double TargetSafetyFromPoint( const G4ThreeVector& pGlobalpoint );
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};
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#endif
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