#include <GroupedCkfTrajectoryBuilder.h>

Inheritance diagram for GroupedCkfTrajectoryBuilder:

Public Member Functions
double	chiSquareCut ()
const Chi2MeasurementEstimatorBase &	estimator () const
	GroupedCkfTrajectoryBuilder (const edm::ParameterSet &conf, const TrajectoryStateUpdator updator, const Propagator propagatorAlong, const Propagator propagatorOpposite, const Chi2MeasurementEstimatorBase estimator, const TransientTrackingRecHitBuilder RecHitBuilder, const MeasurementTracker measurementTracker, const TrajectoryFilter filter, const TrajectoryFilter inOutFilter)
	constructor from ParameterSet
float	lostHitPenalty ()
double	mass ()
	Mass hypothesis used for propagation.
int	maxCand ()
double	ptCut ()
	Pt cut.
void	rebuildSeedingRegion (const TrajectorySeed &, TrajectoryContainer &result) const
void	trajectories (const TrajectorySeed &, TrajectoryContainer &ret, const TrackingRegion &) const
	trajectories building starting from a seed with a region
void	trajectories (const TrajectorySeed &, TrajectoryContainer &ret) const
	trajectories building starting from a seed, return in an already allocated vector
TrajectoryContainer	trajectories (const TrajectorySeed &, const TrackingRegion &) const
	trajectories building starting from a seed with a region
TrajectoryContainer	trajectories (const TrajectorySeed &) const
	set Event for the internal MeasurementTracker data member
const TrajectoryStateUpdator &	updator () const
virtual	~GroupedCkfTrajectoryBuilder ()
	destructor
Protected Member Functions
virtual void	analyseMeasurements (const std::vector< TM > &meas, const Trajectory &traj) const
virtual void	analyseResult (const TrajectoryContainer &result) const
virtual void	analyseSeed (const TrajectorySeed &seed) const
Private Types
enum	work_MaxSize_Size_ { work_MaxSize_ = 50 }
Private Member Functions
bool	advanceOneLayer (TempTrajectory &traj, const TrajectoryFilter regionalCondition, const Propagator propagator, bool inOut, TempTrajectoryContainer &newCand, TempTrajectoryContainer &result) const dso_internal
void	backwardFit (TempTrajectory &candidate, unsigned int nSeed, const TrajectoryFitter &fitter, TempTrajectoryContainer &fittedTracks, std::vector< const TrackingRecHit * > &remainingHits) const dso_internal
void	buildTrajectories (const TrajectorySeed &, TrajectoryContainer &ret, const TrajectoryFilter *) const dso_internal
	common part of both public trajectory building methods
	GroupedCkfTrajectoryBuilder (const GroupedCkfTrajectoryBuilder &) dso_internal
	no copy constructor
void	groupedIntermediaryClean (TempTrajectoryContainer &theTrajectories) const dso_internal
	intermediate cleaning in the case of grouped measurements
void	groupedLimitedCandidates (TempTrajectory &startingTraj, const TrajectoryFilter regionalCondition, const Propagator propagator, bool inOut, TempTrajectoryContainer &result) const dso_internal
void	layers (const TempTrajectory::DataContainer &measurements, std::vector< const DetLayer * > &fillme) const dso_internal
GroupedCkfTrajectoryBuilder &	operator= (const GroupedCkfTrajectoryBuilder &) dso_internal
	no assignment operator
PropagationDirection	oppositeDirection (PropagationDirection dir) const dso_internal
	change of propagation direction
int	rebuildSeedingRegion (const std::vector< const TrackingRecHit * > &seedHits, TempTrajectory &candidate, TempTrajectoryContainer &result) const dso_internal
void	rebuildSeedingRegion (TempTrajectory &startingTraj, TempTrajectoryContainer &result) const dso_internal
	try to find additional hits in seeding region
bool	tkxor (bool a, bool b) const dso_internal
bool	verifyHits (TempTrajectory::DataContainer::const_iterator rbegin, size_t maxDepth, const std::vector< const TrackingRecHit * > &hits) const dso_internal
	Verifies presence of a RecHits in a range of TrajectoryMeasurements.
Private Attributes
float	maxPtForLooperReconstruction
bool	theAlwaysUseInvalid
bool	theBestHitOnly
double	theChiSquareCut
TrajectoryFilter *	theConfigurableCondition
float	theFoundHitBonus
bool	theIntermediateCleaning
bool	theLockHits
float	theLostHitPenalty
double	theMass
int	theMaxCand
unsigned int	theMinNrOf2dHitsForRebuild
unsigned int	theMinNrOfHitsForRebuild
double	theptCut
bool	theRequireSeedHitsInRebuild
TempTrajectoryContainer	work_

Detailed Description

A highly configurable trajectory builder that allows full exploration of the combinatorial tree of possible continuations, and provides efficient ways of trimming the combinatorial tree.

Definition at line 24 of file GroupedCkfTrajectoryBuilder.h.

Member Enumeration Documentation

enum GroupedCkfTrajectoryBuilder::work_MaxSize_Size_ [private]

Enumerator:

work_MaxSize_

Definition at line 203 of file GroupedCkfTrajectoryBuilder.h.

{ work_MaxSize_ = 50 };  // if it grows above this number, it is forced to resize to half this amount when cleared

Constructor & Destructor Documentation

GroupedCkfTrajectoryBuilder::GroupedCkfTrajectoryBuilder	(	const edm::ParameterSet &	conf,
		const TrajectoryStateUpdator *	updator,
		const Propagator *	propagatorAlong,
		const Propagator *	propagatorOpposite,
		const Chi2MeasurementEstimatorBase *	estimator,
		const TransientTrackingRecHitBuilder *	RecHitBuilder,
		const MeasurementTracker *	measurementTracker,
		const TrajectoryFilter *	filter,
		const TrajectoryFilter *	inOutFilter
	)

constructor from ParameterSet

Definition at line 67 of file GroupedCkfTrajectoryBuilder.cc.

References edm::ParameterSet::existsAs(), edm::ParameterSet::getParameter(), max(), maxPtForLooperReconstruction, theAlwaysUseInvalid, theBestHitOnly, theFoundHitBonus, theIntermediateCleaning, theLockHits, theLostHitPenalty, theMaxCand, theMinNrOf2dHitsForRebuild, theMinNrOfHitsForRebuild, and theRequireSeedHitsInRebuild.

                                                                              :


  BaseCkfTrajectoryBuilder(conf,
                           updator, propagatorAlong,propagatorOpposite,
                           estimator, recHitBuilder, measurementTracker, filter, inOutFilter)
{
  // fill data members from parameters (eventually data members could be dropped)
  //
  theMaxCand                  = conf.getParameter<int>("maxCand");

  theLostHitPenalty           = conf.getParameter<double>("lostHitPenalty");
  theFoundHitBonus            = conf.getParameter<double>("foundHitBonus");
  theIntermediateCleaning     = conf.getParameter<bool>("intermediateCleaning");
  theAlwaysUseInvalid         = conf.getParameter<bool>("alwaysUseInvalidHits");
  theLockHits                 = conf.getParameter<bool>("lockHits");
  theBestHitOnly              = conf.getParameter<bool>("bestHitOnly");
  theMinNrOf2dHitsForRebuild  = 2;
  theRequireSeedHitsInRebuild = conf.getParameter<bool>("requireSeedHitsInRebuild");
  theMinNrOfHitsForRebuild    = max(0,conf.getParameter<int>("minNrOfHitsForRebuild"));
  maxPtForLooperReconstruction     = conf.existsAs<double>("maxPtForLooperReconstruction") ? 
    conf.getParameter<double>("maxPtForLooperReconstruction") : 0;

  /* ======= B.M. to be ported layer ===========
  bool setOK = thePropagator->setMaxDirectionChange(1.6);
  if (!setOK) 
    cout  << "GroupedCkfTrajectoryBuilder WARNING: "
          << "propagator does not support setMaxDirectionChange" 
          << endl;
  //   addStopCondition(theMinPtStopCondition);

  theConfigurableCondition = createAlgo<TrajectoryFilter>(componentConfig("StopCondition"));
  ===================================== */

}

virtual GroupedCkfTrajectoryBuilder::~GroupedCkfTrajectoryBuilder ( ) [inline, virtual]

destructor

Definition at line 39 of file GroupedCkfTrajectoryBuilder.h.

{}

GroupedCkfTrajectoryBuilder::GroupedCkfTrajectoryBuilder ( const GroupedCkfTrajectoryBuilder & ) [private]

no copy constructor

Member Function Documentation

bool GroupedCkfTrajectoryBuilder::advanceOneLayer	(	TempTrajectory &	traj,
		const TrajectoryFilter *	regionalCondition,
		const Propagator *	propagator,
		bool	inOut,
		TempTrajectoryContainer &	newCand,
		TempTrajectoryContainer &	result
	)		const `[private]`

Definition at line 346 of file GroupedCkfTrajectoryBuilder.cc.

Referenced by groupedLimitedCandidates().

{
  std::pair<TSOS,std::vector<const DetLayer*> > stateAndLayers = findStateAndLayers(traj);
  if(maxPtForLooperReconstruction>0 && inOut){
    if(traj.lastLayer()->location()==0 && 
       stateAndLayers.first.globalMomentum().perp()<maxPtForLooperReconstruction)
      stateAndLayers.second.push_back(traj.lastLayer());
  }

  vector<const DetLayer*>::iterator layerBegin = stateAndLayers.second.begin();
  vector<const DetLayer*>::iterator layerEnd   = stateAndLayers.second.end();

  //   if (nl.empty()) {
  //     addToResult(traj,result,inOut);
  //     return false;
  //   }
  
  LogDebug("CkfPattern")<<whatIsTheNextStep(traj, stateAndLayers);
  
  bool foundSegments(false);
  bool foundNewCandidates(false);
  for ( vector<const DetLayer*>::iterator il=layerBegin; 
        il!=layerEnd; il++) {

    TSOS stateToUse = stateAndLayers.first;

    double dPhiCacheForLoopersReconstruction(0);
    if ((*il)==traj.lastLayer()){
      if(maxPtForLooperReconstruction>0){
        // ------ For loopers reconstruction
        //cout<<" self propagating in advanceOneLayer (for loopers) \n";
        const BarrelDetLayer* sbdl = dynamic_cast<const BarrelDetLayer*>(traj.lastLayer());
        if(sbdl){
          HelixBarrelCylinderCrossing cylinderCrossing(stateToUse.globalPosition(),
                                                       stateToUse.globalMomentum(),
                                                       stateToUse.transverseCurvature(),
                                                       propagator->propagationDirection(),
                                                       sbdl->specificSurface());
          if(!cylinderCrossing.hasSolution()) continue;
          GlobalPoint starting = stateToUse.globalPosition();
          GlobalPoint target1 = cylinderCrossing.position1();
          GlobalPoint target2 = cylinderCrossing.position2();
          
          GlobalPoint farther = fabs(starting.phi()-target1.phi()) > fabs(starting.phi()-target2.phi()) ?
            target1 : target2;
        
          const Bounds& bounds( sbdl->specificSurface().bounds());
          float length = bounds.length() / 2.f;
        
          /*
            cout << "starting: " << starting << endl;
            cout << "target1: " << target1 << endl;
            cout << "target2: " << target2 << endl;
            cout << "dphi: " << (target1.phi()-target2.phi()) << endl;
            cout << "length: " << length << endl;
          */
        
          /*
          float deltaZ = bounds.thickness()/2.f/fabs(tan(stateToUse.globalDirection().theta()) ) ;
          if(stateToUse.hasError())
            deltaZ += 3*sqrt(stateToUse.cartesianError().position().czz());
          if( fabs(farther.z()) > length + deltaZ ) continue;
          */
          if(fabs(farther.z())*0.95>length) continue;

          Geom::Phi<double> tmpDphi = target1.phi()-target2.phi();

          // -- FIXME: this cut should be configurable and it has to be tuned
          //if(tmpDphi.degrees() )>170)continue;
          //if(fabs(tmpDphi)>2.966) continue;
          if(fabs(tmpDphi)>1.5) continue;
          GlobalPoint target((target1.x()+target2.x())/2,
                             (target1.y()+target2.y())/2,
                             (target1.z()+target2.z())/2);
          
          //cout << "target: " << target << endl;
          

          
          TransverseImpactPointExtrapolator extrapolator;
          stateToUse = extrapolator.extrapolate(stateToUse, target, *propagator);
          if (!stateToUse.isValid()) continue; //SK: consider trying the original? probably not

          //dPhiCacheForLoopersReconstruction = fabs(target1.phi()-target2.phi())*2.;
          dPhiCacheForLoopersReconstruction = fabs(tmpDphi);
        }else{
          continue;
        }
      }else{
        // ------ For cosmics reconstruction
        LogDebug("CkfPattern")<<" self propagating in advanceOneLayer.\n from: \n"<<stateToUse;
        //self navigation case
        // go to a middle point first
        TransverseImpactPointExtrapolator middle;
        GlobalPoint center(0,0,0);
        stateToUse = middle.extrapolate(stateToUse, center, *theForwardPropagator);
        
        if (!stateToUse.isValid()) continue;
        LogDebug("CkfPattern")<<"to: "<<stateToUse;
      }
    }
    
    unsigned int maxCandidates = theMaxCand > 21 ? theMaxCand*2 : 42; //limit the number of returned segments
    TrajectorySegmentBuilder layerBuilder(theMeasurementTracker,
                                          theLayerMeasurements,
                                          **il,*propagator,
                                          *theUpdator,*theEstimator,
                                          theLockHits,theBestHitOnly, maxCandidates);

    LogDebug("CkfPattern")<<whatIsTheStateToUse(stateAndLayers.first,stateToUse,*il);
    
    TempTrajectoryContainer segments=
      layerBuilder.segments(stateToUse);

    LogDebug("CkfPattern")<< "GCTB: number of segments = " << segments.size();

    if ( !segments.empty() )  foundSegments = true;

    for ( TempTrajectoryContainer::const_iterator is=segments.begin();
          is!=segments.end(); is++ ) {
      //
      // assume "invalid hit only" segment is last in list
      //
      const TempTrajectory::DataContainer & measurements = is->measurements();
      if ( !theAlwaysUseInvalid && is!=segments.begin() && measurements.size()==1 && 
           (measurements.front().recHit()->getType() == TrackingRecHit::missing) )  break;
      //
      // create new candidate
      //
      TempTrajectory newTraj(traj);
      traj.setDPhiCacheForLoopersReconstruction(dPhiCacheForLoopersReconstruction);
      
      //----  avoid to add the same hits more than once in the trajectory ----
      bool toBeRejected(false);
      for(const TempTrajectory::DataContainer::const_iterator revIt = measurements.rbegin(); 
          revIt!=measurements.rend(); --revIt){
        int tmpCounter(0);
        for(const TempTrajectory::DataContainer::const_iterator newTrajMeasIt = newTraj.measurements().rbegin(); 
            newTrajMeasIt != newTraj.measurements().rend(); --newTrajMeasIt){
          if(tmpCounter==2) break;
          if(revIt->recHit()->geographicalId()==newTrajMeasIt->recHit()->geographicalId()){
            toBeRejected=true;
            break;
          }
          tmpCounter++;
        }
      }

      if(!toBeRejected){
        //newTraj.push(*is);
        //std::cout << "DEBUG: newTraj after push found,lost: " 
        //        << newTraj.foundHits() << " , " 
        //        << newTraj.lostHits() << " , "
        //        << newTraj.measurements().size() << std::endl;
      }else{    
        /*cout << "WARNING: neglect candidate because it contains the same hit twice \n";
        cout << "-- discarded track's pt,eta,#found: " 
             << newTraj.lastMeasurement().updatedState().globalMomentum().perp() << " , "
             << newTraj.lastMeasurement().updatedState().globalMomentum().eta() << " , "
             << newTraj.foundHits() << "\n";
        */
        continue; //Are we sure about this????
      }
      // ------------------------


      newTraj.push(*is);
      //GIO// for ( vector<TM>::const_iterator im=measurements.begin();
      //GIO//        im!=measurements.end(); im++ )  newTraj.push(*im);
      //if ( toBeContinued(newTraj,regionalCondition) ) { TOBE FIXED
      if ( toBeContinued(newTraj, inOut) ) {
        // Have added one more hit to track candidate
        
        LogDebug("CkfPattern")<<"GCTB: adding updated trajectory to candidates: inOut="<<inOut<<" hits="<<newTraj.foundHits();

        newCand.push_back(newTraj);
        foundNewCandidates = true;
      }
      else {
        // Have finished building this track. Check if it passes cuts.

        LogDebug("CkfPattern")<< "GCTB: adding completed trajectory to results if passes cuts: inOut="<<inOut<<" hits="<<newTraj.foundHits();

        addToResult(newTraj, result, inOut);
      }
    }
  }

  if ( !foundSegments ){
    LogDebug("CkfPattern")<< "GCTB: adding input trajectory to result";
    addToResult(traj, result, inOut);
  }
  return foundNewCandidates;
}

virtual void GroupedCkfTrajectoryBuilder::analyseMeasurements	(	const std::vector< TM > &	meas,
		const Trajectory &	traj
	)		const `[inline, protected, virtual]`

Definition at line 94 of file GroupedCkfTrajectoryBuilder.h.

{}

virtual void GroupedCkfTrajectoryBuilder::analyseResult ( const TrajectoryContainer & result ) const [inline, protected, virtual]

Definition at line 96 of file GroupedCkfTrajectoryBuilder.h.

Referenced by buildTrajectories().

{}

virtual void GroupedCkfTrajectoryBuilder::analyseSeed ( const TrajectorySeed & seed ) const [inline, protected, virtual]

Definition at line 92 of file GroupedCkfTrajectoryBuilder.h.

Referenced by buildTrajectories().

{}

void GroupedCkfTrajectoryBuilder::backwardFit	(	TempTrajectory &	candidate,
		unsigned int	nSeed,
		const TrajectoryFitter &	fitter,
		TempTrajectoryContainer &	fittedTracks,
		std::vector< const TrackingRecHit * > &	remainingHits
	)		const `[private]`

Definition at line 867 of file GroupedCkfTrajectoryBuilder.cc.

References TempTrajectory::direction(), Trajectory::direction(), PrintoutHelper::dumpMeasurement(), PrintoutHelper::dumpMeasurements(), Trajectory::firstMeasurement(), TrajectoryFitter::fit(), TempTrajectory::foundHits(), TrackingRecHit::isValid(), LogDebug, max(), TempTrajectory::measurements(), oppositeDirection(), Trajectory::push(), Trajectory::recHits(), TrajectoryStateOnSurface::rescaleError(), TempTrajectory::seed(), Trajectory::seed(), theMinNrOfHitsForRebuild, and TrajectoryMeasurement::updatedState().

Referenced by rebuildSeedingRegion().

{
  //
  // clear array of non-fitted hits
  //
  remainingHits.clear();
  fittedTracks.clear();
  //
  // skip candidates which are not exceeding the seed size
  // (e.g. Because no Tracker layers exist outside seeding region)
  //
  if ( candidate.measurements().size()<=nSeed ) {
    fittedTracks.clear();
    return;
  }

  LogDebug("CkfPattern")<<"nSeed " << nSeed << endl
                        << "Old traj direction = " << candidate.direction() << endl
                        <<PrintoutHelper::dumpMeasurements(candidate.measurements());

  //
  // backward fit trajectory.
  // (Will try to fit only hits outside the seeding region. However,
  // if there are not enough of these, it will also use the seeding hits).
  //
  TempTrajectory::DataContainer oldMeasurements(candidate.measurements());
//   int nOld(oldMeasurements.size());
//   const unsigned int nHitAllMin(5);
//   const unsigned int nHit2dMin(2);
  unsigned int nHit(0);    // number of valid hits after seeding region
  //unsigned int nHit2d(0);  // number of valid hits after seeding region with 2D info
  // use all hits except the first n (from seed), but require minimum
  // specified in configuration.
  //  Swapped over next two lines.
  unsigned int nHitMin = max(candidate.foundHits()-nSeed,theMinNrOfHitsForRebuild);
  //  unsigned int nHitMin = oldMeasurements.size()-nSeed;
  // we want to rebuild only if the number of VALID measurements excluding the seed measurements is higher than the cut
  if (nHitMin<theMinNrOfHitsForRebuild){
        fittedTracks.clear();
        return;
  }

  LogDebug("CkfPattern")/* << "nHitMin " << nHitMin*/ <<"Sizes: " << oldMeasurements.size() << " / ";
  //
  // create input trajectory for backward fit
  //
  Trajectory fwdTraj(candidate.seed(),oppositeDirection(candidate.direction()));
  //const TrajectorySeed seed = TrajectorySeed(PTrajectoryStateOnDet(), TrajectorySeed::recHitContainer(), oppositeDirection(candidate.direction()));
  //Trajectory fwdTraj(seed, oppositeDirection(candidate.direction()));
  std::vector<const DetLayer*> bwdDetLayer; 
  for ( TempTrajectory::DataContainer::const_iterator im=oldMeasurements.rbegin();
        im!=oldMeasurements.rend(); --im) {
    const TrackingRecHit* hit = im->recHit()->hit();
    //
    // add hits until required number is reached
    //
    if ( nHit<nHitMin ){//|| nHit2d<theMinNrOf2dHitsForRebuild ) {
      fwdTraj.push(*im);
      bwdDetLayer.push_back(im->layer());
      //
      // count valid / 2D hits
      //
      if ( hit->isValid() ) {
        nHit++;
        //if ( hit.isMatched() ||
        //     hit.det().detUnits().front()->type().module()==pixel )
        //nHit2d++;
      }
    }
    //if (nHit==nHitMin) lastBwdDetLayer=im->layer();   
    //
    // keep remaining (valid) hits for verification
    //
    else if ( hit->isValid() ) {
      //std::cout << "Adding a remaining hit" << std::endl;
      remainingHits.push_back(hit);
    }
  }
  //
  // Fit only if required number of valid hits can be used
  //
  if ( nHit<nHitMin ){  //|| nHit2d<theMinNrOf2dHitsForRebuild ) {
    fittedTracks.clear();
    return;
  }
  //
  // Do the backward fit (important: start from scaled, not random cov. matrix!)
  //
  TrajectoryStateOnSurface firstTsos(fwdTraj.firstMeasurement().updatedState());
  //cout << "firstTsos "<< firstTsos << endl;
  firstTsos.rescaleError(10.);
  //TrajectoryContainer bwdFitted(fitter.fit(fwdTraj.seed(),fwdTraj.recHits(),firstTsos));
  TrajectoryContainer bwdFitted(fitter.fit(
                TrajectorySeed(PTrajectoryStateOnDet(), TrajectorySeed::recHitContainer(), oppositeDirection(candidate.direction())),
                fwdTraj.recHits(),firstTsos));
  if (bwdFitted.size()){
    LogDebug("CkfPattern")<<"Obtained " << bwdFitted.size() << " bwdFitted trajectories with measurement size " << bwdFitted.front().measurements().size();
        TempTrajectory fitted(fwdTraj.seed(), fwdTraj.direction());
        vector<TM> tmsbf = bwdFitted.front().measurements();
        int iDetLayer=0;
        //this is ugly but the TM in the fitted track do not contain the DetLayer.
        //So we have to cache the detLayer pointers and replug them in.
        //For the backward building it would be enaugh to cache the last DetLayer, 
        //but for the intermediary cleaning we need all
        for ( vector<TM>::const_iterator im=tmsbf.begin();im!=tmsbf.end(); im++ ) {
                fitted.push(TM( (*im).forwardPredictedState(),
                                (*im).backwardPredictedState(),
                                (*im).updatedState(),
                                (*im).recHit(),
                                (*im).estimate(),
                                bwdDetLayer[iDetLayer]));

                LogDebug("CkfPattern")<<PrintoutHelper::dumpMeasurement(*im);
                iDetLayer++;
        }
/*
        TM lastMeas = bwdFitted.front().lastMeasurement();
        fitted.pop();
        fitted.push(TM(lastMeas.forwardPredictedState(), 
                               lastMeas.backwardPredictedState(), 
                               lastMeas.updatedState(),
                               lastMeas.recHit(),
                               lastMeas.estimate(),
                               lastBwdDetLayer));*/
        fittedTracks.push_back(fitted);
  }
  //
  // save result
  //
  //fittedTracks.swap(bwdFitted);
  //cout << "Obtained " << fittedTracks.size() << " fittedTracks trajectories with measurement size " << fittedTracks.front().measurements().size() << endl;
}

void GroupedCkfTrajectoryBuilder::buildTrajectories	(	const TrajectorySeed &	seed,
		GroupedCkfTrajectoryBuilder::TrajectoryContainer &	result,
		const TrajectoryFilter *	regionalCondition
	)		const `[private]`

common part of both public trajectory building methods

Definition at line 180 of file GroupedCkfTrajectoryBuilder.cc.

References analyseResult(), analyseSeed(), BaseCkfTrajectoryBuilder::createStartingTrajectory(), groupedLimitedCandidates(), LogDebug, BaseCkfTrajectoryBuilder::theForwardPropagator, work_, and work_MaxSize_.

Referenced by trajectories().

{
  //
  // Build trajectory outwards from seed
  //

  analyseSeed( seed);

  TempTrajectory startingTraj = createStartingTrajectory( seed);

  work_.clear();
  const bool inOut = true;
  groupedLimitedCandidates( startingTraj, regionalCondition, theForwardPropagator, inOut, work_);
  if ( work_.empty() )  return ;



  /*  rebuilding is de-coupled from standard building
  //
  // try to additional hits in the seeding region
  //
  if ( theMinNrOfHitsForRebuild>0 ) {
    // reverse direction
    //thePropagator->setPropagationDirection(oppositeDirection(seed.direction()));
    // rebuild part of the trajectory
    rebuildSeedingRegion(startingTraj,work);
  }

  */

  result.reserve(work_.size());
  for (TempTrajectoryContainer::const_iterator it = work_.begin(), ed = work_.end(); it != ed; ++it) {
      result.push_back( it->toTrajectory() );
  }

  work_.clear(); 
  if (work_.capacity() > work_MaxSize_) {  TempTrajectoryContainer().swap(work_); work_.reserve(work_MaxSize_/2); }

  analyseResult(result);

  LogDebug("CkfPattern")<< "GroupedCkfTrajectoryBuilder: returning result of size " << result.size();

}

double GroupedCkfTrajectoryBuilder::chiSquareCut ( ) [inline]

Chi**2 Cut on the new Trajectory Measurements to consider

Definition at line 72 of file GroupedCkfTrajectoryBuilder.h.

References theChiSquareCut.

{return theChiSquareCut;}

const Chi2MeasurementEstimatorBase& GroupedCkfTrajectoryBuilder::estimator ( void ) const [inline]

Definition at line 67 of file GroupedCkfTrajectoryBuilder.h.

References BaseCkfTrajectoryBuilder::theEstimator.

Referenced by rebuildSeedingRegion().

{return *theEstimator;}

void GroupedCkfTrajectoryBuilder::groupedIntermediaryClean ( TempTrajectoryContainer & theTrajectories ) const [private]

intermediate cleaning in the case of grouped measurements

recHitEqualByChannels(im1->recHit(),im2->recHit()) ) {

Definition at line 548 of file GroupedCkfTrajectoryBuilder.cc.

References ecalTPGAnalyzer_cfg::firstValid, TempTrajectory::isValid(), layers(), cmsutils::bqueue< T >::rbegin(), cmsutils::bqueue< T >::rend(), TrackingRecHit::some, and tkxor().

Referenced by groupedLimitedCandidates().

{
  //if (theTrajectories.empty()) return TrajectoryContainer();
  //TrajectoryContainer result;
  if (theTrajectories.empty()) return;  
  //RecHitEqualByChannels recHitEqualByChannels(false, false);
  int firstLayerSize, secondLayerSize;
  vector<const DetLayer*> firstLayers, secondLayers;

  for (TempTrajectoryContainer::iterator firstTraj=theTrajectories.begin();
       firstTraj!=(theTrajectories.end()-1); firstTraj++) {

    if ( (!firstTraj->isValid()) ||
         (!firstTraj->lastMeasurement().recHit()->isValid()) ) continue;
    const TempTrajectory::DataContainer & firstMeasurements = firstTraj->measurements();
    layers(firstMeasurements, firstLayers);
    firstLayerSize = firstLayers.size();
    if ( firstLayerSize<4 )  continue;

    for (TempTrajectoryContainer::iterator secondTraj=(firstTraj+1);
       secondTraj!=theTrajectories.end(); secondTraj++) {

      if ( (!secondTraj->isValid()) ||
           (!secondTraj->lastMeasurement().recHit()->isValid()) ) continue;
      const TempTrajectory::DataContainer & secondMeasurements = secondTraj->measurements();
      layers(secondMeasurements, secondLayers);
      secondLayerSize = secondLayers.size();
      //
      // only candidates using the same last 3 layers are compared
      //
      if ( firstLayerSize!=secondLayerSize )  continue;
      if ( firstLayers[0]!=secondLayers[0] ||
           firstLayers[1]!=secondLayers[1] ||
           firstLayers[2]!=secondLayers[2] )  continue;

      TempTrajectory::DataContainer::const_iterator im1 = firstMeasurements.rbegin();
      TempTrajectory::DataContainer::const_iterator im2 = secondMeasurements.rbegin();
      //
      // check for identical hits in the last layer
      //
      bool unequal(false);
      const DetLayer* layerPtr = firstLayers[0];
      while ( im1!=firstMeasurements.rend()&&im2!=secondMeasurements.rend() ) {
        if ( im1->layer()!=layerPtr || im2->layer()!=layerPtr )  break;
        if ( !(im1->recHit()->isValid()) || !(im2->recHit()->isValid()) ||
             !im1->recHit()->hit()->sharesInput(im2->recHit()->hit(), TrackingRecHit::some) ) {
          unequal = true;
          break;
        }
        --im1;
        --im2;
      }
      if ( im1==firstMeasurements.rend() || im2==secondMeasurements.rend() ||
           im1->layer()==layerPtr || im2->layer()==layerPtr || unequal )  continue;
      //
      // check for invalid hits in the layer -2
      // compare only candidates with invalid / valid combination
      //
      layerPtr = firstLayers[1];
      bool firstValid(true);
      while ( im1!=firstMeasurements.rend()&&im1->layer()==layerPtr ) {
        if ( !im1->recHit()->isValid() )  firstValid = false;
        --im1;
      }
      bool secondValid(true);
      while ( im2!=secondMeasurements.rend()&&im2->layer()==layerPtr ) {
        if ( !im2->recHit()->isValid() )  secondValid = false;
        --im2;
      }
      if ( !tkxor(firstValid,secondValid) )  continue;
      //
      // ask for identical hits in layer -3
      //
      unequal = false;
      layerPtr = firstLayers[2];
      while ( im1!=firstMeasurements.rend()&&im2!=secondMeasurements.rend() ) {
        if ( im1->layer()!=layerPtr || im2->layer()!=layerPtr )  break;
        if ( !(im1->recHit()->isValid()) || !(im2->recHit()->isValid()) ||
             !im1->recHit()->hit()->sharesInput(im2->recHit()->hit(), TrackingRecHit::some) ) {
          unequal = true;
          break;
        }
        --im1;
        --im2;
      }
      if ( im1==firstMeasurements.rend() || im2==secondMeasurements.rend() ||
           im1->layer()==layerPtr || im2->layer()==layerPtr || unequal )  continue;

      if ( !firstValid ) {
        firstTraj->invalidate();
        break;
      }
      else {
        secondTraj->invalidate();
        break;
      }
    }
  }
/*
  for (TempTrajectoryContainer::const_iterator it = theTrajectories.begin();
       it != theTrajectories.end(); it++) {
    if(it->isValid()) result.push_back( *it);
  }

  return result;
*/
  theTrajectories.erase(std::remove_if( theTrajectories.begin(),theTrajectories.end(),
                                        std::not1(std::mem_fun_ref(&TempTrajectory::isValid))),
 //                                     boost::bind(&TempTrajectory::isValid,_1)), 
                        theTrajectories.end());
}

void GroupedCkfTrajectoryBuilder::groupedLimitedCandidates	(	TempTrajectory &	startingTraj,
		const TrajectoryFilter *	regionalCondition,
		const Propagator *	propagator,
		bool	inOut,
		TempTrajectoryContainer &	result
	)		const `[private]`

Definition at line 228 of file GroupedCkfTrajectoryBuilder.cc.

References advanceOneLayer(), clean, PrintoutHelper::dumpCandidates(), groupedIntermediaryClean(), LogDebug, python::multivaluedict::sort(), theFoundHitBonus, theIntermediateCleaning, theLostHitPenalty, and theMaxCand.

Referenced by buildTrajectories(), and rebuildSeedingRegion().

{
  unsigned int nIter=1;
  TempTrajectoryContainer candidates;
  TempTrajectoryContainer newCand;
  candidates.push_back( startingTraj);

  while ( !candidates.empty()) {

    newCand.clear();
    for (TempTrajectoryContainer::iterator traj=candidates.begin();
         traj!=candidates.end(); traj++) {
      if ( !advanceOneLayer(*traj, regionalCondition, propagator, inOut, newCand, result) ) {
        LogDebug("CkfPattern")<< "GCTB: terminating after advanceOneLayer==false";
        continue;
      }

      LogDebug("CkfPattern")<<"newCand(1): after advanced one layer:\n"<<PrintoutHelper::dumpCandidates(newCand);

      if ((int)newCand.size() > theMaxCand) {
        //ShowCand()(newCand);

        sort( newCand.begin(), newCand.end(), GroupedTrajCandLess(theLostHitPenalty,theFoundHitBonus));
        newCand.erase( newCand.begin()+theMaxCand, newCand.end());
      }
      LogDebug("CkfPattern")<<"newCand(2): after removing extra candidates.\n"<<PrintoutHelper::dumpCandidates(newCand);
    }

    LogDebug("CkfPattern") << "newCand.size() at end = " << newCand.size();
/*
    if (theIntermediateCleaning) {
      candidates.clear();
      candidates = groupedIntermediaryClean(newCand);
    } else {
      candidates.swap(newCand);
    }
*/
    if (theIntermediateCleaning) {
#ifdef STANDARD_INTERMEDIARYCLEAN
        IntermediateTrajectoryCleaner::clean(newCand);  
#else 
        groupedIntermediaryClean(newCand);
#endif  

    }   
    candidates.swap(newCand);

    LogDebug("CkfPattern") <<"candidates(3): "<<result.size()<<" candidates after "<<nIter++<<" groupedCKF iteration: \n"
                           <<PrintoutHelper::dumpCandidates(result)
                           <<"\n "<<candidates.size()<<" running candidates are: \n"
                           <<PrintoutHelper::dumpCandidates(candidates);
  }
}

void GroupedCkfTrajectoryBuilder::layers	(	const TempTrajectory::DataContainer &	measurements,
		std::vector< const DetLayer * > &	fillme
	)		const `[private]`

fills in a list of layers from a container of TrajectoryMeasurements the "fillme" vector is cleared beforehand.

Referenced by groupedIntermediaryClean().

float GroupedCkfTrajectoryBuilder::lostHitPenalty ( ) [inline]

Chi**2 Penalty for each lost hit.

Definition at line 79 of file GroupedCkfTrajectoryBuilder.h.

References theLostHitPenalty.

{return theLostHitPenalty;}

double GroupedCkfTrajectoryBuilder::mass ( ) [inline]

Mass hypothesis used for propagation.

Definition at line 88 of file GroupedCkfTrajectoryBuilder.h.

References theMass.

{return theMass;}

int GroupedCkfTrajectoryBuilder::maxCand ( ) [inline]

Maximum number of trajectory candidates to propagate to the next layer.

Definition at line 75 of file GroupedCkfTrajectoryBuilder.h.

References theMaxCand.

{return theMaxCand;}

GroupedCkfTrajectoryBuilder& GroupedCkfTrajectoryBuilder::operator= ( const GroupedCkfTrajectoryBuilder & ) [private]

no assignment operator

PropagationDirection GroupedCkfTrajectoryBuilder::oppositeDirection ( PropagationDirection dir ) const [inline, private]

change of propagation direction

Definition at line 158 of file GroupedCkfTrajectoryBuilder.h.

References alongMomentum, dir, and oppositeToMomentum.

Referenced by backwardFit().

                                                                                              {
    if ( dir==alongMomentum )  return oppositeToMomentum;
    else if ( dir==oppositeToMomentum )  return alongMomentum;
    return dir;
  }

double GroupedCkfTrajectoryBuilder::ptCut ( ) [inline]

Pt cut.

Tells whether an intermediary cleaning stage should take place during TB.

Definition at line 85 of file GroupedCkfTrajectoryBuilder.h.

References theptCut.

{return theptCut;}

void GroupedCkfTrajectoryBuilder::rebuildSeedingRegion	(	TempTrajectory &	startingTraj,
		TempTrajectoryContainer &	result
	)		const `[private]`

try to find additional hits in seeding region

Definition at line 684 of file GroupedCkfTrajectoryBuilder.cc.

References backwardFit(), estimator(), TempTrajectory::isValid(), LogDebug, TempTrajectory::measurements(), rebuildSeedingRegion(), TrajectorySeed::recHits(), TempTrajectory::seed(), BaseCkfTrajectoryBuilder::theBackwardPropagator, and updator().

{
  //
  // Rebuilding of trajectories. Candidates are taken from result,
  // which will be replaced with the solutions after rebuild
  // (assume vector::swap is more efficient than building new container)
  //
  LogDebug("CkfPattern")<< "Starting to rebuild " << result.size() << " tracks";
  //
  // Fitter (need to create it here since the propagation direction
  // might change between different starting trajectories)
  //
  KFTrajectoryFitter fitter(&(*theBackwardPropagator),&updator(),&estimator());
  //
  TempTrajectoryContainer reFitted;
  TrajectorySeed::range rseedHits = startingTraj.seed().recHits();
  std::vector<const TrackingRecHit*> seedHits;
  //seedHits.insert(seedHits.end(), rseedHits.first, rseedHits.second);
  //for (TrajectorySeed::recHitContainer::const_iterator iter = rseedHits.first; iter != rseedHits.second; iter++){
  //    seedHits.push_back(&*iter);
  //}

  //unsigned int nSeed(seedHits.size());
  unsigned int nSeed(rseedHits.second-rseedHits.first);
  //seedHits.reserve(nSeed);
  TempTrajectoryContainer rebuiltTrajectories;
  for ( TempTrajectoryContainer::iterator it=result.begin();
        it!=result.end(); it++ ) {
    //
    // skip candidates which are not exceeding the seed size 
    // (e.g. because no Tracker layers outside seeding region) 
    //

    if ( it->measurements().size()<=startingTraj.measurements().size() ) {
      rebuiltTrajectories.push_back(*it);
      LogDebug("CkfPattern")<< "RebuildSeedingRegion skipped as in-out trajectory does not exceed seed size.";
      continue;
    }
    //
    // Refit - keep existing trajectory in case fit is not possible
    // or fails
    //
    backwardFit(*it,nSeed,fitter,reFitted,seedHits);
    if ( reFitted.size()!=1 ) {
      rebuiltTrajectories.push_back(*it);
      LogDebug("CkfPattern")<< "RebuildSeedingRegion skipped as backward fit failed";
      //                            << "after reFitted.size() " << reFitted.size();
      continue;
    }
    //LogDebug("CkfPattern")<<"after reFitted.size() " << reFitted.size();
    //
    // Rebuild seeding part. In case it fails: keep initial trajectory
    // (better to drop it??)
    //
    int nRebuilt =
      rebuildSeedingRegion (seedHits,reFitted.front(),rebuiltTrajectories);

    if ( nRebuilt==0 ) it->invalidate();  // won't use original in-out track

    if ( nRebuilt<=0 ) rebuiltTrajectories.push_back(*it);

  }
  //
  // Replace input trajectories with new ones
  //
  result.swap(rebuiltTrajectories);
  result.erase(std::remove_if( result.begin(),result.end(),
                               std::not1(std::mem_fun_ref(&TempTrajectory::isValid))),
               result.end());
}

int GroupedCkfTrajectoryBuilder::rebuildSeedingRegion	(	const std::vector< const TrackingRecHit * > &	seedHits,
		TempTrajectory &	candidate,
		TempTrajectoryContainer &	result
	)		const `[private]`

Definition at line 757 of file GroupedCkfTrajectoryBuilder.cc.

References gather_cfg::cout, PrintoutHelper::dumpCandidates(), PrintoutHelper::dumpMeasurements(), groupedLimitedCandidates(), LogDebug, TempTrajectory::measurements(), TempTrajectory::push(), BaseCkfTrajectoryBuilder::theBackwardPropagator, theRequireSeedHitsInRebuild, and verifyHits().

{
  //
  // Starting from track found by in-out tracking phase, extrapolate it inwards through
  // the seeding region if possible in towards smaller Tracker radii, searching for additional
  // hits.
  // The resulting trajectories are returned in result,
  // the count is the return value.
  //
  TempTrajectoryContainer rebuiltTrajectories;
#ifdef DBG2_GCTB
/*  const LayerFinderByDet layerFinder;
  if ( !seedHits.empty() && seedHits.front().isValid() ) {
    DetLayer* seedLayer = layerFinder(seedHits.front().det());
    cout << "Seed hit at " << seedHits.front().globalPosition()
         << " " << seedLayer << endl;
    cout << "Started from " 
         << candidate.lastMeasurement().updatedState().globalPosition().perp() << " "
         << candidate.lastMeasurement().updatedState().globalPosition().z() << endl;
    pair<bool,TrajectoryStateOnSurface> layerComp(false,TrajectoryStateOnSurface());
    if ( seedLayer ) layerComp =
      seedLayer->compatible(candidate.lastMeasurement().updatedState(),
                              propagator(),estimator());
    pair<bool,TrajectoryStateOnSurface> detComp =
      seedHits.front().det().compatible(candidate.lastMeasurement().updatedState(),
                                        propagator(),estimator());
    cout << "  layer compatibility = " << layerComp.first;
    cout << "  det compatibility = " << detComp.first;
    if ( detComp.first ) {
      cout << "  estimate = " 
           << estimator().estimate(detComp.second,seedHits.front()).second ;
    }
    cout << endl;
  }*/
  cout << "Before backward building: #measurements = " 
       << candidate.measurements().size() ; //<< endl;;
#endif
  //
  // Use standard building with standard cuts. Maybe better to use different
  // cuts from "forward" building (e.g. no check on nr. of invalid hits)?
  //
  const bool inOut = false;
  groupedLimitedCandidates(candidate, (const TrajectoryFilter*)0, theBackwardPropagator, inOut, rebuiltTrajectories);

  LogDebug("CkfPattern")<<" After backward building: "<<PrintoutHelper::dumpCandidates(rebuiltTrajectories);

  //
  // Check & count resulting candidates
  //
  int nrOfTrajectories(0);
  bool orig_ok = false;
  //const RecHitEqualByChannels recHitEqual(false,false);
  //vector<TM> oldMeasurements(candidate.measurements());
  for ( TempTrajectoryContainer::iterator it=rebuiltTrajectories.begin();
        it!=rebuiltTrajectories.end(); it++ ) {

    TempTrajectory::DataContainer newMeasurements(it->measurements());
    //
    // Verify presence of seeding hits?
    //
    if ( theRequireSeedHitsInRebuild ) {
      orig_ok = true;
      // no hits found (and possibly some invalid hits discarded): drop track
      if ( newMeasurements.size()<=candidate.measurements().size() ){  
        LogDebug("CkfPattern") << "newMeasurements.size()<=candidate.measurements().size()";
        continue;
      } 
      // verify presence of hits
      //GIO//if ( !verifyHits(newMeasurements.begin()+candidate.measurements().size(),
      //GIO//                  newMeasurements.end(),seedHits) ){
      if ( !verifyHits(newMeasurements.rbegin(), 
                       newMeasurements.size() - candidate.measurements().size(),
                       seedHits) ){
        LogDebug("CkfPattern")<< "seed hits not found in rebuild";
        continue; 
      }
    }
    //
    // construct final trajectory in the right order
    //
    TempTrajectory reversedTrajectory(it->seed(),it->seed().direction());
    for (TempTrajectory::DataContainer::const_iterator im=newMeasurements.rbegin(), ed = newMeasurements.rend();
          im != ed; --im ) {
      reversedTrajectory.push(*im);
    }
    // save & count result
    result.push_back(reversedTrajectory);
    nrOfTrajectories++;

    LogDebug("CkgPattern")<<"New traj direction = " << reversedTrajectory.direction()<<"\n"
                          <<PrintoutHelper::dumpMeasurements(reversedTrajectory.measurements());
  }
  // If nrOfTrajectories = 0 and orig_ok = true, this means that a track was actually found on the
  // out-in step (meeting those requirements) but did not have the seed hits in it.
  // In this case when we return we will go ahead and use the original in-out track.

  // If nrOfTrajectories = 0 and orig_ok = false, this means that the out-in step failed to
  // find any track.  Two cases are a technical failure in fitting the original seed hits or
  // because the track did not meet the out-in criteria (which may be stronger than the out-in
  // criteria).  In this case we will NOT allow the original in-out track to be used.

  if ( (nrOfTrajectories == 0) && orig_ok ) {
    nrOfTrajectories = -1;
  }
  return nrOfTrajectories;
}

void GroupedCkfTrajectoryBuilder::rebuildSeedingRegion	(	const TrajectorySeed &	seed,
		TrajectoryContainer &	result
	)		const `[virtual]`

trajectories re-building in the seeding region. It looks for additional measurements in the seeding region of the intial trajectories. Only valid trajectories are returned. Invalid ones are dropped from the input collection.

Reimplemented from TrajectoryBuilder.

Definition at line 154 of file GroupedCkfTrajectoryBuilder.cc.

References BaseCkfTrajectoryBuilder::createStartingTrajectory().

Referenced by rebuildSeedingRegion().

                                                                                     {    
  TempTrajectory startingTraj = createStartingTrajectory( seed);
  TempTrajectoryContainer work;

  TrajectoryContainer final;

  work.reserve(result.size());
  for (TrajectoryContainer::iterator traj=result.begin();
       traj!=result.end(); ++traj) {
    if(traj->isValid()) work.push_back(TempTrajectory(*traj));
  }

  rebuildSeedingRegion(startingTraj,work);
  final.reserve(work.size());

  for (TempTrajectoryContainer::iterator traj=work.begin();
       traj!=work.end(); ++traj) {
    final.push_back(traj->toTrajectory());
  }
  
  result.swap(final);
  
}

bool GroupedCkfTrajectoryBuilder::tkxor	(	bool	a,
		bool	b
	)		const `[inline, private]`

Definition at line 110 of file GroupedCkfTrajectoryBuilder.h.

References b.

Referenced by groupedIntermediaryClean().

{return (a||b) && !(a&&b);}

GroupedCkfTrajectoryBuilder::TrajectoryContainer GroupedCkfTrajectoryBuilder::trajectories	(	const TrajectorySeed &	seed,
		const TrackingRegion &	region
	)		const

trajectories building starting from a seed with a region

Definition at line 128 of file GroupedCkfTrajectoryBuilder.cc.

References buildTrajectories(), and run_regression::ret.

{
  TrajectoryContainer ret; 
  ret.reserve(10);
  RegionalTrajectoryFilter regionalCondition(region);
  buildTrajectories(seed, ret, &regionalCondition);
  return ret; 
}

GroupedCkfTrajectoryBuilder::TrajectoryContainer GroupedCkfTrajectoryBuilder::trajectories ( const TrajectorySeed & seed ) const [virtual]

set Event for the internal MeasurementTracker data member

trajectories building starting from a seed

Implements BaseCkfTrajectoryBuilder.

Definition at line 119 of file GroupedCkfTrajectoryBuilder.cc.

References buildTrajectories(), and run_regression::ret.

{
  TrajectoryContainer ret; 
  ret.reserve(10);
  buildTrajectories(seed, ret, 0);
  return ret; 
}

void GroupedCkfTrajectoryBuilder::trajectories	(	const TrajectorySeed &	seed,
		GroupedCkfTrajectoryBuilder::TrajectoryContainer &	ret
	)		const `[virtual]`

trajectories building starting from a seed, return in an already allocated vector

Reimplemented from TrajectoryBuilder.

Definition at line 139 of file GroupedCkfTrajectoryBuilder.cc.

References buildTrajectories().

{
  buildTrajectories(seed,ret,0);
}

void GroupedCkfTrajectoryBuilder::trajectories	(	const TrajectorySeed &	seed,
		GroupedCkfTrajectoryBuilder::TrajectoryContainer &	ret,
		const TrackingRegion &	region
	)		const

trajectories building starting from a seed with a region

Definition at line 145 of file GroupedCkfTrajectoryBuilder.cc.

References buildTrajectories().

{
  RegionalTrajectoryFilter regionalCondition(region);
  buildTrajectories(seed,ret,&regionalCondition);
}

const TrajectoryStateUpdator& GroupedCkfTrajectoryBuilder::updator ( ) const [inline]

Definition at line 66 of file GroupedCkfTrajectoryBuilder.h.

References BaseCkfTrajectoryBuilder::theUpdator.

Referenced by rebuildSeedingRegion().

{return *theUpdator;}

bool GroupedCkfTrajectoryBuilder::verifyHits	(	TempTrajectory::DataContainer::const_iterator	rbegin,
		size_t	maxDepth,
		const std::vector< const TrackingRecHit * > &	hits
	)		const `[private]`

Verifies presence of a RecHits in a range of TrajectoryMeasurements.

Definition at line 1004 of file GroupedCkfTrajectoryBuilder.cc.

References LogDebug, and TrackingRecHit::some.

Referenced by rebuildSeedingRegion().

{
  //
  // verify presence of the seeding hits
  //
  LogDebug("CkfPattern")<<"Checking for " << hits.size() << " hits in "
                        << maxDepth << " measurements" << endl;

  TempTrajectory::DataContainer::const_iterator rend = rbegin; 
  while (maxDepth > 0) { --maxDepth; --rend; }
  for ( vector<const TrackingRecHit*>::const_iterator ir=hits.begin();
        ir!=hits.end(); ir++ ) {
    // assume that all seeding hits are valid!
    bool foundHit(false);
    for ( TempTrajectory::DataContainer::const_iterator im=rbegin; im!=rend; --im ) {
      if ( im->recHit()->isValid() && (*ir)->sharesInput(im->recHit()->hit(), TrackingRecHit::some) ) {
        foundHit = true;
        break;
      }
    }
    if ( !foundHit )  return false;
  }
  return true;
}