Gabriele Cosmo
168 lines
5.4 KiB
Plaintext
168 lines
5.4 KiB
Plaintext
//
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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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//
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// $Id: G4VIntersectionLocator.icc,v 1.3 2008/11/14 18:26:35 gcosmo Exp $
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// GEANT4 tag $Name: geant4-09-02 $
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//
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//
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// Class G4VIntersectionLocator inline methods
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//
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// 27.10.07 - John Apostolakis, Tatiana Nikitina
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// ---------------------------------------------------------------------------
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inline G4double G4VIntersectionLocator::GetDeltaIntersectionFor()
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{
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return fiDeltaIntersection;
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}
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inline G4double G4VIntersectionLocator::GetEpsilonStepFor()
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{
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return fiEpsilonStep;
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}
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inline G4Navigator* G4VIntersectionLocator::GetNavigatorFor()
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{
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return fiNavigator;
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}
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inline G4ChordFinder* G4VIntersectionLocator::GetChordFinderFor()
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{
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return fiChordFinder;
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}
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inline G4int G4VIntersectionLocator::GetVerboseFor()
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{
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return fVerboseLevel;
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}
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inline G4bool G4VIntersectionLocator::GetAdjustementOfFoundIntersection()
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{
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return fUseNormalCorrection;
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}
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inline void G4VIntersectionLocator::
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AddAdjustementOfFoundIntersection(G4bool UseCorrection )
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{
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fUseNormalCorrection=UseCorrection;
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}
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inline void G4VIntersectionLocator::SetEpsilonStepFor( G4double EpsilonStep )
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{
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fiEpsilonStep=EpsilonStep;
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}
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inline void G4VIntersectionLocator::
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SetDeltaIntersectionFor( G4double deltaIntersection )
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{
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fiDeltaIntersection=deltaIntersection;
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}
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inline void G4VIntersectionLocator::SetNavigatorFor( G4Navigator *fNavigator )
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{
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fiNavigator=fNavigator;
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}
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inline void G4VIntersectionLocator::SetChordFinderFor(G4ChordFinder *fCFinder )
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{
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fiChordFinder=fCFinder;
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}
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inline void G4VIntersectionLocator::SetSafetyParametersFor(G4bool UseSafety )
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{
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fiUseSafety=UseSafety;
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}
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inline void G4VIntersectionLocator::SetVerboseFor(G4int fVerbose)
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{
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fVerboseLevel=fVerbose;
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}
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inline G4bool
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G4VIntersectionLocator::IntersectChord( G4ThreeVector StartPointA,
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G4ThreeVector EndPointB,
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G4double &NewSafety,
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G4double &fPreviousSafety,
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G4ThreeVector &fPreviousSftOrigin,
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G4double &LinearStepLength,
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G4ThreeVector &IntersectionPoint )
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{
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// Calculate the direction and length of the chord AB
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G4ThreeVector ChordAB_Vector = EndPointB - StartPointA;
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G4double ChordAB_Length = ChordAB_Vector.mag(); // Magnitude (norm)
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G4ThreeVector ChordAB_Dir = ChordAB_Vector.unit();
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G4bool intersects;
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G4ThreeVector OriginShift = StartPointA - fPreviousSftOrigin ;
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G4double MagSqShift = OriginShift.mag2() ;
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G4double currentSafety;
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G4bool doCallNav= false;
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if( MagSqShift >= sqr(fPreviousSafety) )
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{
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currentSafety = 0.0 ;
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}
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else
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{
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currentSafety = fPreviousSafety - std::sqrt(MagSqShift) ;
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}
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if( fiUseSafety && (ChordAB_Length <= currentSafety) )
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{
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// The Step is guaranteed to be taken
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LinearStepLength = ChordAB_Length;
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intersects = false;
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NewSafety= currentSafety;
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}
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else
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{
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doCallNav= true;
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// Check whether any volumes are encountered by the chord AB
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LinearStepLength = GetNavigatorFor()->ComputeStep( StartPointA,
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ChordAB_Dir, ChordAB_Length, NewSafety );
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intersects = (LinearStepLength <= ChordAB_Length);
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// G4Navigator contracts to return k_infinity if len==asked
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// and it did not find a surface boundary at that length
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LinearStepLength = std::min( LinearStepLength, ChordAB_Length);
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// Save the last calculated safety!
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fPreviousSftOrigin = StartPointA;
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fPreviousSafety= NewSafety;
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if( intersects )
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{
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// Intersection Point of chord AB and either volume A's surface
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// or a daughter volume's surface ..
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IntersectionPoint = StartPointA + LinearStepLength * ChordAB_Dir;
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}
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}
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return intersects;
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}
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