Gabriele Cosmo
793 lines
33 KiB
C++
793 lines
33 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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// $Id: G4BrentLocator.cc 66872 2013-01-15 01:25:57Z japost $
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//
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// Class G4BrentLocator implementation
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//
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// 27.10.08 - Tatiana Nikitina.
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// 04.10.11 - John Apostolakis, revised convergence to use Surface Normal
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// ---------------------------------------------------------------------------
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#include "G4BrentLocator.hh"
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#include "G4ios.hh"
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#include <iomanip>
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G4BrentLocator::G4BrentLocator(G4Navigator *theNavigator)
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: G4VIntersectionLocator(theNavigator)
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{
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// In case of too slow progress in finding Intersection Point
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// intermediates Points on the Track must be stored.
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// Initialise the array of Pointers [max_depth+1] to do this
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G4ThreeVector zeroV(0.0,0.0,0.0);
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for (G4int idepth=0; idepth<max_depth+1; idepth++ )
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{
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ptrInterMedFT[ idepth ] = new G4FieldTrack( zeroV, zeroV, 0., 0., 0., 0.);
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}
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// Counters for Locator
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// Counter for Maximum Number Of Trial before Intersection Found
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//
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maxNumberOfStepsForIntersection=0;
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// Counter for Number Of Calls to ReIntegrationEndPoint Method
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//
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maxNumberOfCallsToReIntegration=0;
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maxNumberOfCallsToReIntegration_depth=0;
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}
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G4BrentLocator::~G4BrentLocator()
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{
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for ( G4int idepth=0; idepth<max_depth+1; idepth++)
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{
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delete ptrInterMedFT[idepth];
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}
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#ifdef G4DEBUG_FIELD
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if(fVerboseLevel>0)
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{
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G4cout << "G4BrentLocator::Location with Max Number of Steps="
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<< maxNumberOfStepsForIntersection<<G4endl;
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G4cout << "G4BrentLocator::ReIntegrateEndPoint was called "
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<< maxNumberOfCallsToReIntegration
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<< " times and for depth algorithm "
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<< maxNumberOfCallsToReIntegration_depth << " times." << G4endl;
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}
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#endif
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}
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// --------------------------------------------------------------------------
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// G4bool G4PropagatorInField::LocateIntersectionPoint(
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// const G4FieldTrack& CurveStartPointVelocity, // A
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// const G4FieldTrack& CurveEndPointVelocity, // B
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// const G4ThreeVector& TrialPoint, // E
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// G4FieldTrack& IntersectedOrRecalculated // Output
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// G4bool& recalculated) // Out
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// --------------------------------------------------------------------------
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//
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// Function that returns the intersection of the true path with the surface
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// of the current volume (either the external one or the inner one with one
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// of the daughters:
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//
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// A = Initial point
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// B = another point
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//
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// Both A and B are assumed to be on the true path:
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//
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// E is the first point of intersection of the chord AB with
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// a volume other than A (on the surface of A or of a daughter)
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//
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// Convention of Use :
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// i) If it returns "true", then IntersectionPointVelocity is set
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// to the approximate intersection point.
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// ii) If it returns "false", no intersection was found.
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// The validity of IntersectedOrRecalculated depends on 'recalculated'
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// a) if latter is false, then IntersectedOrRecalculated is invalid.
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// b) if latter is true, then IntersectedOrRecalculated is
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// the new endpoint, due to a re-integration.
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// --------------------------------------------------------------------------
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// NOTE: implementation taken from G4PropagatorInField
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// New second order locator is added
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//
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G4bool G4BrentLocator::EstimateIntersectionPoint(
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const G4FieldTrack& CurveStartPointVelocity, // A
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const G4FieldTrack& CurveEndPointVelocity, // B
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const G4ThreeVector& TrialPoint, // E
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G4FieldTrack& IntersectedOrRecalculatedFT, // Output
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G4bool& recalculatedEndPoint, // Out
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G4double& fPreviousSafety, // In/Out
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G4ThreeVector& fPreviousSftOrigin) // In/Out
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{
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// Find Intersection Point ( A, B, E ) of true path AB - start at E.
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G4bool found_approximate_intersection = false;
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G4bool there_is_no_intersection = false;
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G4FieldTrack CurrentA_PointVelocity = CurveStartPointVelocity;
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G4FieldTrack CurrentB_PointVelocity = CurveEndPointVelocity;
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G4ThreeVector CurrentE_Point = TrialPoint;
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G4bool validNormalAtE = false;
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G4ThreeVector NormalAtEntry;
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G4FieldTrack ApproxIntersecPointV(CurveEndPointVelocity); // FT-Def-Construct
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G4double NewSafety = 0.0;
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G4bool last_AF_intersection = false;
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// G4bool final_section= true; // Shows whether current section is last
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// (i.e. B=full end)
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G4bool first_section = true;
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recalculatedEndPoint = false;
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G4bool restoredFullEndpoint = false;
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G4int oldprc; // cout, cerr precision
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G4int substep_no = 0;
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// Limits for substep number
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//
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const G4int max_substeps= 10000; // Test 120 (old value 100 )
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const G4int warn_substeps= 1000; // 100
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// Statistics for substeps
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//
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static G4ThreadLocal G4int max_no_seen= -1;
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// Counter for restarting Bintermed
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//
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G4int restartB = 0;
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//--------------------------------------------------------------------------
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// Algorithm for the case if progress in founding intersection is too slow.
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// Process is defined too slow if after N=param_substeps advances on the
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// path, it will be only 'fraction_done' of the total length.
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// In this case the remaining length is divided in two half and
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// the loop is restarted for each half.
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// If progress is still too slow, the division in two halfs continue
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// until 'max_depth'.
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//--------------------------------------------------------------------------
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const G4int param_substeps=50; // Test value for the maximum number
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// of substeps
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const G4double fraction_done=0.3;
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G4bool Second_half = false; // First half or second half of divided step
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NormalAtEntry = GetSurfaceNormal(CurrentE_Point, validNormalAtE);
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// We need to know this for the 'final_section':
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// real 'final_section' or first half 'final_section'
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// In algorithm it is considered that the 'Second_half' is true
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// and it becomes false only if we are in the first-half of level
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// depthness or if we are in the first section
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G4int depth=0; // Depth counts how many subdivisions of initial step made
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#ifdef G4DEBUG_FIELD
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static G4double tolerance= 1.0e-8;
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G4ThreeVector StartPosition= CurveStartPointVelocity.GetPosition();
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if( (TrialPoint - StartPosition).mag() < tolerance * mm )
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{
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G4Exception("G4BrentLocator::EstimateIntersectionPoint()",
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"GeomNav1002", JustWarning,
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"Intersection point F is exactly at start point A." );
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}
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#endif
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// Intermediates Points on the Track = Subdivided Points must be stored.
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// Give the initial values to 'InterMedFt'
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// Important is 'ptrInterMedFT[0]', it saves the 'EndCurvePoint'
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//
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*ptrInterMedFT[0] = CurveEndPointVelocity;
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for (G4int idepth=1; idepth<max_depth+1; idepth++ )
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{
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*ptrInterMedFT[idepth]=CurveStartPointVelocity;
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}
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//Final_section boolean store
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G4bool fin_section_depth[max_depth];
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for (G4int idepth=0; idepth<max_depth; idepth++ )
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{
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fin_section_depth[idepth]=true;
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}
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// 'SubStartPoint' is needed to calculate the length of the divided step
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//
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G4FieldTrack SubStart_PointVelocity = CurveStartPointVelocity;
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do
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{
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G4int substep_no_p = 0;
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G4bool sub_final_section = false; // the same as final_section,
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// but for 'sub_section'
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SubStart_PointVelocity = CurrentA_PointVelocity;
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do // REPEAT param
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{
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G4ThreeVector Point_A = CurrentA_PointVelocity.GetPosition();
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G4ThreeVector Point_B = CurrentB_PointVelocity.GetPosition();
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// F = a point on true AB path close to point E
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// (the closest if possible)
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//
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if(substep_no_p==0)
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{
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ApproxIntersecPointV = GetChordFinderFor()
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->ApproxCurvePointV( CurrentA_PointVelocity,
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CurrentB_PointVelocity,
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CurrentE_Point,
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GetEpsilonStepFor());
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// The above method is the key & most intuitive part ...
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}
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#ifdef G4DEBUG_FIELD
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if( ApproxIntersecPointV.GetCurveLength() >
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CurrentB_PointVelocity.GetCurveLength() * (1.0 + tolerance) )
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{
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G4Exception("G4BrentLocator::EstimateIntersectionPoint()",
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"GeomNav0003", FatalException,
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"Intermediate F point is past end B point" );
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}
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#endif
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G4ThreeVector CurrentF_Point= ApproxIntersecPointV.GetPosition();
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// First check whether EF is small - then F is a good approx. point
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// Calculate the length and direction of the chord AF
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//
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G4ThreeVector ChordEF_Vector = CurrentF_Point - CurrentE_Point;
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G4ThreeVector NewMomentumDir= ApproxIntersecPointV.GetMomentumDir();
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G4double MomDir_dot_Norm= NewMomentumDir.dot( NormalAtEntry ) ;
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#ifdef G4DEBUG_FIELD
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G4ThreeVector ChordAB = Point_B - Point_A;
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G4VIntersectionLocator::ReportTrialStep( substep_no, ChordAB,
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ChordEF_Vector, NewMomentumDir, NormalAtEntry, validNormalAtE );
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#endif
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G4bool adequate_angle;
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adequate_angle = ( MomDir_dot_Norm >= 0.0 ) // Can use -epsilon instead.
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|| (! validNormalAtE ); // Makes criterion invalid
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G4double EF_dist2 = ChordEF_Vector.mag2();
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if ( ( EF_dist2 <= sqr(fiDeltaIntersection) && ( adequate_angle ) )
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|| ( EF_dist2 <= kCarTolerance*kCarTolerance ) )
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{
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found_approximate_intersection = true;
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// Create the "point" return value
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//
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IntersectedOrRecalculatedFT = ApproxIntersecPointV;
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IntersectedOrRecalculatedFT.SetPosition( CurrentE_Point );
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if ( GetAdjustementOfFoundIntersection() )
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{
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// Try to Get Correction of IntersectionPoint using SurfaceNormal()
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//
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G4ThreeVector IP;
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G4ThreeVector MomentumDir=ApproxIntersecPointV.GetMomentumDirection();
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G4bool goodCorrection = AdjustmentOfFoundIntersection( Point_A,
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CurrentE_Point, CurrentF_Point, MomentumDir,
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last_AF_intersection, IP, NewSafety,
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fPreviousSafety, fPreviousSftOrigin );
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if ( goodCorrection )
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{
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IntersectedOrRecalculatedFT = ApproxIntersecPointV;
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IntersectedOrRecalculatedFT.SetPosition(IP);
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}
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}
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// Note: in order to return a point on the boundary,
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// we must return E. But it is F on the curve.
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// So we must "cheat": we are using the position at point E
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// and the velocity at point F !!!
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//
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// This must limit the length we can allow for displacement!
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}
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else // E is NOT close enough to the curve (ie point F)
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{
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// Check whether any volumes are encountered by the chord AF
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// ---------------------------------------------------------
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// First relocate to restore any Voxel etc information
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// in the Navigator before calling ComputeStep()
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//
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GetNavigatorFor()->LocateGlobalPointWithinVolume( Point_A );
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G4ThreeVector PointG; // Candidate intersection point
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G4double stepLengthAF;
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G4bool usedNavigatorAF = false;
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G4bool Intersects_AF = IntersectChord( Point_A, CurrentF_Point,
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NewSafety,fPreviousSafety,
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fPreviousSftOrigin,
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stepLengthAF,
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PointG,
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&usedNavigatorAF);
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last_AF_intersection = Intersects_AF;
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if( Intersects_AF )
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{
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// G is our new Candidate for the intersection point.
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// It replaces "E" and we will repeat the test to see if
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// it is a good enough approximate point for us.
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// B <- F
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// E <- G
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//
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G4FieldTrack EndPoint = ApproxIntersecPointV;
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ApproxIntersecPointV = GetChordFinderFor()->ApproxCurvePointS(
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CurrentA_PointVelocity, CurrentB_PointVelocity,
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EndPoint,CurrentE_Point, CurrentF_Point,PointG,
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true, GetEpsilonStepFor() );
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CurrentB_PointVelocity = EndPoint;
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CurrentE_Point = PointG;
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// Need to recalculate the Exit Normal at the new PointG
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// Know that a call was made to Navigator::ComputeStep in
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// IntersectChord above.
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//
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G4bool validNormalLast;
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NormalAtEntry = GetSurfaceNormal( PointG, validNormalLast );
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validNormalAtE = validNormalLast;
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// By moving point B, must take care if current
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// AF has no intersection to try current FB!!
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//
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fin_section_depth[depth] = false;
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#ifdef G4VERBOSE
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if( fVerboseLevel > 3 )
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{
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G4cout << "G4PiF::LI> Investigating intermediate point"
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<< " at s=" << ApproxIntersecPointV.GetCurveLength()
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<< " on way to full s="
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<< CurveEndPointVelocity.GetCurveLength() << G4endl;
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}
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#endif
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}
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else // not Intersects_AF
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{
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// In this case:
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// There is NO intersection of AF with a volume boundary.
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// We must continue the search in the segment FB!
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//
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GetNavigatorFor()->LocateGlobalPointWithinVolume( CurrentF_Point );
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G4double stepLengthFB;
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G4ThreeVector PointH;
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G4bool usedNavigatorFB = false;
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// Check whether any volumes are encountered by the chord FB
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// ---------------------------------------------------------
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G4bool Intersects_FB = IntersectChord( CurrentF_Point, Point_B,
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NewSafety,fPreviousSafety,
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fPreviousSftOrigin,
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stepLengthFB,
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PointH,
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&usedNavigatorFB);
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if( Intersects_FB )
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{
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// There is an intersection of FB with a volume boundary
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// H <- First Intersection of Chord FB
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// H is our new Candidate for the intersection point.
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// It replaces "E" and we will repeat the test to see if
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// it is a good enough approximate point for us.
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// Note that F must be in volume volA (the same as A)
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// (otherwise AF would meet a volume boundary!)
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// A <- F
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// E <- H
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//
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G4FieldTrack InterMed=ApproxIntersecPointV;
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ApproxIntersecPointV = GetChordFinderFor()->ApproxCurvePointS(
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CurrentA_PointVelocity,CurrentB_PointVelocity,
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InterMed,CurrentE_Point,CurrentF_Point,PointH,
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false,GetEpsilonStepFor());
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CurrentA_PointVelocity = InterMed;
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CurrentE_Point = PointH;
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// Need to recalculate the Exit Normal at the new PointG
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//
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G4bool validNormalLast;
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NormalAtEntry = GetSurfaceNormal( PointH, validNormalLast );
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validNormalAtE= validNormalLast;
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}
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else // not Intersects_FB
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{
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// There is NO intersection of FB with a volume boundary
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if( fin_section_depth[depth] )
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{
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// If B is the original endpoint, this means that whatever
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// volume(s) intersected the original chord, none touch the
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// smaller chords we have used.
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// The value of 'IntersectedOrRecalculatedFT' returned is
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// likely not valid
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// Check on real final_section or SubEndSection
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//
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if( ((Second_half)&&(depth==0)) || (first_section) )
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{
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there_is_no_intersection = true; // real final_section
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}
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else
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{
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// end of subsection, not real final section
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// exit from the and go to the depth-1 level
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substep_no_p = param_substeps+2; // exit from the loop
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// but 'Second_half' is still true because we need to find
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// the 'CurrentE_point' for the next loop
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//
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Second_half = true;
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sub_final_section = true;
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}
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}
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else
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{
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if(depth==0)
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{
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// We must restore the original endpoint
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//
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CurrentA_PointVelocity = CurrentB_PointVelocity; // Got to B
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CurrentB_PointVelocity = CurveEndPointVelocity;
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SubStart_PointVelocity = CurrentA_PointVelocity;
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ApproxIntersecPointV = GetChordFinderFor()
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->ApproxCurvePointV( CurrentA_PointVelocity,
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CurrentB_PointVelocity,
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CurrentE_Point,
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GetEpsilonStepFor());
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restoredFullEndpoint = true;
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restartB++; // counter
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}
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else
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{
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// We must restore the depth endpoint
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//
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CurrentA_PointVelocity = CurrentB_PointVelocity; // Got to B
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CurrentB_PointVelocity = *ptrInterMedFT[depth];
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SubStart_PointVelocity = CurrentA_PointVelocity;
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ApproxIntersecPointV = GetChordFinderFor()
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->ApproxCurvePointV( CurrentA_PointVelocity,
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CurrentB_PointVelocity,
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CurrentE_Point,
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GetEpsilonStepFor());
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restoredFullEndpoint = true;
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restartB++; // counter
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}
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}
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} // Endif (Intersects_FB)
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} // Endif (Intersects_AF)
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// Ensure that the new endpoints are not further apart in space
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// than on the curve due to different errors in the integration
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//
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G4double linDistSq, curveDist;
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linDistSq = ( CurrentB_PointVelocity.GetPosition()
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- CurrentA_PointVelocity.GetPosition() ).mag2();
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curveDist = CurrentB_PointVelocity.GetCurveLength()
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- CurrentA_PointVelocity.GetCurveLength();
|
|
|
|
// Change this condition for very strict parameters of propagation
|
|
//
|
|
if( curveDist*curveDist*(1+2* GetEpsilonStepFor()) < linDistSq )
|
|
{
|
|
// Re-integrate to obtain a new B
|
|
//
|
|
G4FieldTrack newEndPointFT=
|
|
ReEstimateEndpoint( CurrentA_PointVelocity,
|
|
CurrentB_PointVelocity,
|
|
linDistSq, // to avoid recalculation
|
|
curveDist );
|
|
G4FieldTrack oldPointVelB = CurrentB_PointVelocity;
|
|
CurrentB_PointVelocity = newEndPointFT;
|
|
|
|
if ( (fin_section_depth[depth]) // real final section
|
|
&&( first_section || ((Second_half)&&(depth==0)) ) )
|
|
{
|
|
recalculatedEndPoint = true;
|
|
IntersectedOrRecalculatedFT = newEndPointFT;
|
|
// So that we can return it, if it is the endpoint!
|
|
}
|
|
}
|
|
if( curveDist < 0.0 )
|
|
{
|
|
fVerboseLevel = 5; // Print out a maximum of information
|
|
printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
|
|
-1.0, NewSafety, substep_no );
|
|
std::ostringstream message;
|
|
message << "Error in advancing propagation." << G4endl
|
|
<< " Error in advancing propagation." << G4endl
|
|
<< " Point A (start) is " << CurrentA_PointVelocity
|
|
<< G4endl
|
|
<< " Point B (end) is " << CurrentB_PointVelocity
|
|
<< G4endl
|
|
<< " Curve distance is " << curveDist << G4endl
|
|
<< G4endl
|
|
<< "The final curve point is not further along"
|
|
<< " than the original!" << G4endl;
|
|
|
|
if( recalculatedEndPoint )
|
|
{
|
|
message << "Recalculation of EndPoint was called with fEpsStep= "
|
|
<< GetEpsilonStepFor() << G4endl;
|
|
}
|
|
oldprc = G4cerr.precision(20);
|
|
message << " Point A (Curve start) is " << CurveStartPointVelocity
|
|
<< G4endl
|
|
<< " Point B (Curve end) is " << CurveEndPointVelocity
|
|
<< G4endl
|
|
<< " Point A (Current start) is " << CurrentA_PointVelocity
|
|
<< G4endl
|
|
<< " Point B (Current end) is " << CurrentB_PointVelocity
|
|
<< G4endl
|
|
<< " Point S (Sub start) is " << SubStart_PointVelocity
|
|
<< G4endl
|
|
<< " Point E (Trial Point) is " << CurrentE_Point
|
|
<< G4endl
|
|
<< " Old Point F(Intersection) is " << CurrentF_Point
|
|
<< G4endl
|
|
<< " New Point F(Intersection) is " << ApproxIntersecPointV
|
|
<< G4endl
|
|
<< " LocateIntersection parameters are : Substep no= "
|
|
<< substep_no << G4endl
|
|
<< " Substep depth no= "<< substep_no_p << " Depth= "
|
|
<< depth << G4endl
|
|
<< " Restarted no= "<< restartB << " Epsilon= "
|
|
<< GetEpsilonStepFor() <<" DeltaInters= "
|
|
<< GetDeltaIntersectionFor();
|
|
G4cerr.precision( oldprc );
|
|
|
|
G4Exception("G4BrentLocator::EstimateIntersectionPoint()",
|
|
"GeomNav0003", FatalException, message);
|
|
}
|
|
|
|
if(restoredFullEndpoint)
|
|
{
|
|
fin_section_depth[depth] = restoredFullEndpoint;
|
|
restoredFullEndpoint = false;
|
|
}
|
|
} // EndIf ( E is close enough to the curve, ie point F. )
|
|
// tests ChordAF_Vector.mag() <= maximum_lateral_displacement
|
|
|
|
#ifdef G4DEBUG_LOCATE_INTERSECTION
|
|
static G4int trigger_substepno_print= warn_substeps - 20 ;
|
|
|
|
if( substep_no >= trigger_substepno_print )
|
|
{
|
|
G4cout << "Difficulty in converging in "
|
|
<< "G4BrentLocator::EstimateIntersectionPoint()"
|
|
<< G4endl
|
|
<< " Substep no = " << substep_no << G4endl;
|
|
if( substep_no == trigger_substepno_print )
|
|
{
|
|
printStatus( CurveStartPointVelocity, CurveEndPointVelocity,
|
|
-1.0, NewSafety, 0);
|
|
}
|
|
G4cout << " State of point A: ";
|
|
printStatus( CurrentA_PointVelocity, CurrentA_PointVelocity,
|
|
-1.0, NewSafety, substep_no-1, 0);
|
|
G4cout << " State of point B: ";
|
|
printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
|
|
-1.0, NewSafety, substep_no);
|
|
}
|
|
#endif
|
|
substep_no++;
|
|
substep_no_p++;
|
|
|
|
} while ( ( ! found_approximate_intersection )
|
|
&& ( ! there_is_no_intersection )
|
|
&& ( substep_no_p <= param_substeps) ); // UNTIL found or
|
|
// failed param substep
|
|
first_section = false;
|
|
|
|
if( (!found_approximate_intersection) && (!there_is_no_intersection) )
|
|
{
|
|
G4double did_len = std::abs( CurrentA_PointVelocity.GetCurveLength()
|
|
- SubStart_PointVelocity.GetCurveLength());
|
|
G4double all_len = std::abs( CurrentB_PointVelocity.GetCurveLength()
|
|
- SubStart_PointVelocity.GetCurveLength());
|
|
|
|
G4double stepLengthAB;
|
|
G4ThreeVector PointGe;
|
|
|
|
// Check if progress is too slow and if it possible to go deeper,
|
|
// then halve the step if so
|
|
//
|
|
if ( ( did_len < fraction_done*all_len )
|
|
&& (depth<max_depth) && (!sub_final_section) )
|
|
{
|
|
Second_half=false;
|
|
depth++;
|
|
|
|
G4double Sub_len = (all_len-did_len)/(2.);
|
|
G4FieldTrack start = CurrentA_PointVelocity;
|
|
G4MagInt_Driver* integrDriver =
|
|
GetChordFinderFor()->GetIntegrationDriver();
|
|
integrDriver->AccurateAdvance(start, Sub_len, GetEpsilonStepFor());
|
|
*ptrInterMedFT[depth] = start;
|
|
CurrentB_PointVelocity = *ptrInterMedFT[depth];
|
|
|
|
// Adjust 'SubStartPoint' to calculate the 'did_length' in next loop
|
|
//
|
|
SubStart_PointVelocity = CurrentA_PointVelocity;
|
|
|
|
// Find new trial intersection point needed at start of the loop
|
|
//
|
|
G4ThreeVector Point_A = CurrentA_PointVelocity.GetPosition();
|
|
G4ThreeVector SubE_point = CurrentB_PointVelocity.GetPosition();
|
|
|
|
GetNavigatorFor()->LocateGlobalPointWithinVolume(Point_A);
|
|
G4bool Intersects_AB = IntersectChord(Point_A, SubE_point,
|
|
NewSafety, fPreviousSafety,
|
|
fPreviousSftOrigin,stepLengthAB,
|
|
PointGe);
|
|
if( Intersects_AB )
|
|
{
|
|
last_AF_intersection = Intersects_AB;
|
|
CurrentE_Point = PointGe;
|
|
fin_section_depth[depth]=true;
|
|
|
|
// Need to recalculate the Exit Normal at the new PointG
|
|
//
|
|
G4bool validNormalAB;
|
|
NormalAtEntry = GetSurfaceNormal( PointGe, validNormalAB );
|
|
validNormalAtE= validNormalAB;
|
|
}
|
|
else
|
|
{
|
|
// No intersection found for first part of curve
|
|
// (CurrentA,InterMedPoint[depth]). Go to the second part
|
|
//
|
|
Second_half = true;
|
|
}
|
|
} // if did_len
|
|
|
|
if( (Second_half)&&(depth!=0) )
|
|
{
|
|
// Second part of curve (InterMed[depth],Intermed[depth-1]) )
|
|
// On the depth-1 level normally we are on the 'second_half'
|
|
|
|
Second_half = true;
|
|
|
|
// Find new trial intersection point needed at start of the loop
|
|
//
|
|
SubStart_PointVelocity = *ptrInterMedFT[depth];
|
|
CurrentA_PointVelocity = *ptrInterMedFT[depth];
|
|
CurrentB_PointVelocity = *ptrInterMedFT[depth-1];
|
|
// Ensure that the new endpoints are not further apart in space
|
|
// than on the curve due to different errors in the integration
|
|
//
|
|
G4double linDistSq, curveDist;
|
|
linDistSq = ( CurrentB_PointVelocity.GetPosition()
|
|
- CurrentA_PointVelocity.GetPosition() ).mag2();
|
|
curveDist = CurrentB_PointVelocity.GetCurveLength()
|
|
- CurrentA_PointVelocity.GetCurveLength();
|
|
if( curveDist*curveDist*(1+2*GetEpsilonStepFor() ) < linDistSq )
|
|
{
|
|
// Re-integrate to obtain a new B
|
|
//
|
|
G4FieldTrack newEndPointFT=
|
|
ReEstimateEndpoint( CurrentA_PointVelocity,
|
|
CurrentB_PointVelocity,
|
|
linDistSq, // to avoid recalculation
|
|
curveDist );
|
|
G4FieldTrack oldPointVelB = CurrentB_PointVelocity;
|
|
CurrentB_PointVelocity = newEndPointFT;
|
|
if (depth==1)
|
|
{
|
|
recalculatedEndPoint = true;
|
|
IntersectedOrRecalculatedFT = newEndPointFT;
|
|
// So that we can return it, if it is the endpoint!
|
|
}
|
|
}
|
|
|
|
|
|
G4ThreeVector Point_A = CurrentA_PointVelocity.GetPosition();
|
|
G4ThreeVector SubE_point = CurrentB_PointVelocity.GetPosition();
|
|
GetNavigatorFor()->LocateGlobalPointWithinVolume(Point_A);
|
|
G4bool Intersects_AB = IntersectChord(Point_A, SubE_point, NewSafety,
|
|
fPreviousSafety,
|
|
fPreviousSftOrigin,stepLengthAB, PointGe);
|
|
if( Intersects_AB )
|
|
{
|
|
last_AF_intersection = Intersects_AB;
|
|
CurrentE_Point = PointGe;
|
|
|
|
G4bool validNormalAB;
|
|
NormalAtEntry = GetSurfaceNormal( PointGe, validNormalAB );
|
|
validNormalAtE = validNormalAB;
|
|
}
|
|
|
|
depth--;
|
|
fin_section_depth[depth]=true;
|
|
}
|
|
} // if(!found_aproximate_intersection)
|
|
|
|
} while ( ( ! found_approximate_intersection )
|
|
&& ( ! there_is_no_intersection )
|
|
&& ( substep_no <= max_substeps) ); // UNTIL found or failed
|
|
|
|
if( substep_no > max_no_seen )
|
|
{
|
|
max_no_seen = substep_no;
|
|
#ifdef G4DEBUG_LOCATE_INTERSECTION
|
|
if( max_no_seen > warn_substeps )
|
|
{
|
|
trigger_substepno_print = max_no_seen-20; // Want to see last 20 steps
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if( ( substep_no >= max_substeps)
|
|
&& !there_is_no_intersection
|
|
&& !found_approximate_intersection )
|
|
{
|
|
G4cout << "ERROR - G4BrentLocator::EstimateIntersectionPoint()" << G4endl
|
|
<< " Start and end-point of requested Step:" << G4endl;
|
|
printStatus( CurveStartPointVelocity, CurveEndPointVelocity,
|
|
-1.0, NewSafety, 0);
|
|
G4cout << " Start and end-point of current Sub-Step:" << G4endl;
|
|
printStatus( CurrentA_PointVelocity, CurrentA_PointVelocity,
|
|
-1.0, NewSafety, substep_no-1);
|
|
printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
|
|
-1.0, NewSafety, substep_no);
|
|
std::ostringstream message;
|
|
message << "Too many substeps!" << G4endl
|
|
<< " Convergence is requiring too many substeps: "
|
|
<< substep_no << G4endl
|
|
<< " Abandoning effort to intersect. " << G4endl
|
|
<< " Found intersection = "
|
|
<< found_approximate_intersection << G4endl
|
|
<< " Intersection exists = "
|
|
<< !there_is_no_intersection << G4endl;
|
|
oldprc = G4cout.precision( 10 );
|
|
G4double done_len = CurrentA_PointVelocity.GetCurveLength();
|
|
G4double full_len = CurveEndPointVelocity.GetCurveLength();
|
|
message << " Undertaken only length: " << done_len
|
|
<< " out of " << full_len << " required." << G4endl
|
|
<< " Remaining length = " << full_len - done_len;
|
|
G4cout.precision( oldprc );
|
|
|
|
G4Exception("G4BrentLocator::EstimateIntersectionPoint()",
|
|
"GeomNav0003", FatalException, message);
|
|
}
|
|
else if( substep_no >= warn_substeps )
|
|
{
|
|
oldprc= G4cout.precision( 10 );
|
|
std::ostringstream message;
|
|
message << "Many substeps while trying to locate intersection."
|
|
<< G4endl
|
|
<< " Undertaken length: "
|
|
<< CurrentB_PointVelocity.GetCurveLength()
|
|
<< " - Needed: " << substep_no << " substeps." << G4endl
|
|
<< " Warning level = " << warn_substeps
|
|
<< " and maximum substeps = " << max_substeps;
|
|
G4Exception("G4BrentLocator::EstimateIntersectionPoint()",
|
|
"GeomNav1002", JustWarning, message);
|
|
G4cout.precision( oldprc );
|
|
}
|
|
return !there_is_no_intersection; // Success or failure
|
|
}
|