Gabriele Cosmo
101 lines
4.3 KiB
C++
101 lines
4.3 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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// G4BOptnForceFreeFlight
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// --------------------------------------------------------------------
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#include "G4BOptnForceFreeFlight.hh"
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#include "G4ILawForceFreeFlight.hh"
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#include "G4BiasingProcessInterface.hh"
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#include "G4Step.hh"
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G4BOptnForceFreeFlight::G4BOptnForceFreeFlight(const G4String& name)
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: G4VBiasingOperation( name )
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{
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fForceFreeFlightInteractionLaw = new G4ILawForceFreeFlight("LawForOperation"+name);
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}
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G4BOptnForceFreeFlight::~G4BOptnForceFreeFlight()
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{
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delete fForceFreeFlightInteractionLaw;
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}
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const G4VBiasingInteractionLaw* G4BOptnForceFreeFlight::
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ProvideOccurenceBiasingInteractionLaw( const G4BiasingProcessInterface*,
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G4ForceCondition& proposeForceCondition )
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{
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fOperationComplete = false;
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proposeForceCondition = Forced;
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return fForceFreeFlightInteractionLaw;
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}
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G4VParticleChange* G4BOptnForceFreeFlight::
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ApplyFinalStateBiasing( const G4BiasingProcessInterface* callingProcess,
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const G4Track* track, const G4Step* step,
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G4bool& forceFinalState)
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{
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// -- If the track is reaching the volume boundary, its free flight ends. In this case, its zero
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// -- weight is brought back to non-zero value: its initial weight is restored by the first
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// -- ApplyFinalStateBiasing operation called, and the weight for force free flight is applied
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// -- is applied by each operation.
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// -- If the track is not reaching the volume boundary, it zero weight flight continues.
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fParticleChange.Initialize( *track );
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forceFinalState = true;
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if ( step->GetPostStepPoint()->GetStepStatus() == fGeomBoundary )
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{
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// -- Sanity checks:
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if ( fInitialTrackWeight <= DBL_MIN )
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{
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G4ExceptionDescription ed;
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ed << " Initial track weight is null ! " << G4endl;
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G4Exception(" G4BOptnForceFreeFlight::ApplyFinalStateBiasing(...)",
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"BIAS.GEN.05", JustWarning, ed);
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}
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if ( fCumulatedWeightChange <= DBL_MIN )
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{
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G4ExceptionDescription ed;
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ed << " Cumulated weight is null ! " << G4endl;
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G4Exception(" G4BOptnForceFreeFlight::ApplyFinalStateBiasing(...)",
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"BIAS.GEN.06", JustWarning, ed);
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}
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G4double proposedWeight = track->GetWeight();
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if ( callingProcess->GetIsFirstPostStepDoItInterface() )
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proposedWeight = fCumulatedWeightChange * fInitialTrackWeight;
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else
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proposedWeight *= fCumulatedWeightChange;
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fParticleChange.ProposeWeight(proposedWeight);
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fOperationComplete = true;
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}
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return &fParticleChange;
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}
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void G4BOptnForceFreeFlight::
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AlongMoveBy( const G4BiasingProcessInterface*,
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const G4Step*, G4double weightChange )
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{
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fCumulatedWeightChange *= weightChange;
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}
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