HLT/src/AliL3ConfMapper.cxx

   1 //$Id$
   2
   3 // Author: Anders Vestbo <mailto:vestbo@fi.uib.no>
   4 //*-- Copyright &copy ASV
   5
   6 #include <iostream.h>
   7 #include <time.h>
   8 #include <math.h>
   9 #include <sys/time.h>
  10 #include "AliL3ConfMapper.h"
  11
  12 #include "AliL3Defs.h"
  13 #include "AliL3Logging.h"
  14 #include "AliL3Vertex.h"
  15 #include "AliL3ConfMapTrack.h"
  16 #include "AliL3ConfMapPoint.h"
  17 #include "AliL3TrackArray.h"
  18 #include "AliL3Transform.h"
  19
  20 //_____________________________________________________________
  21 // AliL3ConfMapper
  22 //
  23 // Conformal mapping base class
  24 //
  25 ClassImp(AliL3ConfMapper)
  26
  27 Double_t AliL3ConfMapper::pi=3.14159265358979323846;
  28 Double_t AliL3ConfMapper::twopi=2*pi;
  29 Double_t AliL3ConfMapper::todeg=180./pi;
  30
  31 AliL3ConfMapper::AliL3ConfMapper()
  32 {
  33   //Default constructor
  34   fVertex = NULL;
  35   fTrack = NULL;
  36   fHit = NULL;
  37   fVolume = NULL;
  38   fRow = NULL;
  39   fBench = (Bool_t)true;
  40   fParamSet = (Bool_t)false;
  41   fVertexConstraint = (Bool_t)true;
  42
  43 }
  44
  45
  46 AliL3ConfMapper::~AliL3ConfMapper()
  47 {
  48   // Destructor.
  49
  50   if(fVolume) {
  51     delete [] fVolume;
  52   }
  53   if(fRow) {
  54     delete [] fRow;
  55   }
  56   if(fHit) {
  57     delete [] fHit;
  58   }
  59   if(fTrack) {
  60     delete fTrack;
  61   }
  62
  63 }
  64
  65 void AliL3ConfMapper::InitVolumes()
  66 {
  67   //Data organization.
  68   //Allocate volumes, set conformal coordinates and pointers.
  69
  70   //Should be done after setting the track parameters
  71
  72   fNumRowSegmentPlusOne = 176;//NumRows[0]; //Maximum 32.
  73   fNumPhiSegmentPlusOne = fNumPhiSegment+1;
  74   fNumEtaSegmentPlusOne = fNumEtaSegment+1;
  75   fNumPhiEtaSegmentPlusOne = fNumPhiSegmentPlusOne*fNumEtaSegmentPlusOne;
  76   fBounds = fNumRowSegmentPlusOne * fNumPhiSegmentPlusOne * fNumEtaSegmentPlusOne;
  77
  78   //Allocate volumes:
  79   if(fVolume) delete [] fVolume;
  80   if(fRow) delete [] fRow;
  81
  82   LOG(AliL3Log::kInformational,"AliL3ConfMapper::InitVolumes","Memory")<<AliL3Log::kDec<<
  83     "Allocating "<<fBounds*sizeof(AliL3ConfMapContainer)<<" Bytes to fVolume"<<ENDLOG;
  84   LOG(AliL3Log::kInformational,"AliL3ConfMapper::InitVolumes","Memory")<<AliL3Log::kDec<<
  85     "Allocating "<<fNumRowSegmentPlusOne*sizeof(AliL3ConfMapContainer)<<" Bytes to fRow"<<ENDLOG;
  86
  87   fVolume = new AliL3ConfMapContainer[fBounds];
  88   fRow = new AliL3ConfMapContainer[fNumRowSegmentPlusOne];
  89
  90   memset(fVolume,0,fBounds*sizeof(AliL3ConfMapContainer));
  91   memset(fRow,0,fNumRowSegmentPlusOne*sizeof(AliL3ConfMapContainer));
  92
  93   Int_t max_num_of_tracks = 1000;
  94   Int_t max_num_of_hits = 50000;
  95
  96   if(fHit)
  97     delete [] fHit;
  98   if(fTrack)
  99     delete fTrack;
 100
 101   fHit = new AliL3ConfMapPoint[max_num_of_hits];
 102   fTrack = new AliL3TrackArray("AliL3ConfMapTrack",max_num_of_tracks);
 103 }
 104
 105 void AliL3ConfMapper::InitSector(Int_t sector,Int_t *rowrange,Float_t *etarange)
 106 {
 107   //Initialize tracker for tracking in a given sector.
 108   //Resets track and hit arrays.
 109   //Here it is also possible to specify a subsector, by defining
 110   //rowrange[0]=innermost row;
 111   //rowrange[1]=outermostrow;
 112   //Finally you can specify etaslices to save time (assuming a good seed from TRD...)
 113
 114   //Define tracking area:
 115   if(rowrange)
 116     {
 117       fRowMin = rowrange[0];
 118       fRowMax = rowrange[1];
 119     }
 120   else //complete sector
 121     {
 122       fRowMin = 0;
 123       fRowMax = 175;
 124     }
 125   if(etarange)
 126     {
 127       fEtaMin = etarange[0];
 128       fEtaMax = etarange[1];
 129     }
 130   else
 131     {
 132       fEtaMin = 0;
 133       //fEtaMax = sector < 18 ? 1 : -1;
 134       fEtaMax = sector < 18 ? 0.9 : -0.9;
 135     }
 136
 137   //Set the angles to sector 2:
 138   fPhiMin = -1.*10/todeg;//fParam->GetAngle(sector) - 10/todeg;
 139   fPhiMax = 10/todeg;//fParam->GetAngle(sector) + 10/todeg;
 140
 141   nTracks=0;
 142   fMainVertexTracks = 0;
 143   fClustersUnused = 0;
 144
 145   fNumRowSegment = fRowMax - fRowMin; //number of rows to be considered by tracker
 146   LOG(AliL3Log::kInformational,"AliL3ConfMapper::InitSector","B-field")
 147     <<"Tracker initializing assuming magnetic field of "<<AliL3Transform::GetBField()<<ENDLOG;
 148
 149   fTrack->Reset();
 150 }
 151
 152
 153
 154 Bool_t AliL3ConfMapper::ReadHits(UInt_t count, AliL3SpacePointData* hits )
 155 {
 156   Int_t nhit=(Int_t)count;
 157   for (Int_t i=0;i<nhit;i++)
 158     {
 159       fHit[i].Reset();
 160       fHit[i].ReadHits(&(hits[i]));
 161     }
 162   fClustersUnused += nhit;
 163   LOG(AliL3Log::kInformational,"AliL3ConfMapper::ReadHits","#hits")
 164     <<AliL3Log::kDec<<"hit_counter: "<<nhit<<" count: "<<count<<ENDLOG;
 165
 166   return true;
 167 }
 168
 169
 170 void AliL3ConfMapper::SetPointers()
 171 {
 172
 173   //Reset detector volumes
 174   memset(fVolume,0,fBounds*sizeof(AliL3ConfMapContainer));
 175   memset(fRow,0,fNumRowSegmentPlusOne*sizeof(AliL3ConfMapContainer));
 176
 177   Float_t phiSlice = (fPhiMax-fPhiMin)/fNumPhiSegment;
 178   Float_t etaSlice = (fEtaMax-fEtaMin)/fNumEtaSegment;
 179
 180   Int_t volumeIndex;
 181   Int_t local_counter=0;
 182   for(Int_t j=0; j<fClustersUnused; j++)
 183     {
 184
 185       //AliL3ConfMapPoint *thisHit = (AliL3ConfMapPoint*)fHit->At(j);
 186       AliL3ConfMapPoint *thisHit = &(fHit[j]);
 187
 188       thisHit->Setup(fVertex);
 189
 190       Int_t localrow = thisHit->GetPadRow();
 191
 192       if(localrow < fRowMin || localrow > fRowMax)
 193         continue;
 194
 195       //Get indexes:
 196       thisHit->phiIndex=(Int_t)((thisHit->GetPhi()-fPhiMin)/phiSlice +1);
 197
 198       if(thisHit->phiIndex<1 || thisHit->phiIndex>fNumPhiSegment)
 199         {
 200           fPhiHitsOutOfRange++;
 201           continue;
 202         }
 203
 204       thisHit->etaIndex=(Int_t)((thisHit->GetEta()-fEtaMin)/etaSlice + 1);
 205       if(thisHit->etaIndex<1 || thisHit->etaIndex>fNumEtaSegment)
 206         {
 207           fEtaHitsOutOfRange++;
 208           continue;
 209         }
 210       local_counter++;
 211
 212       volumeIndex = (localrow-fRowMin)*fNumPhiEtaSegmentPlusOne+thisHit->phiIndex*fNumEtaSegmentPlusOne+thisHit->etaIndex;
 213
 214       if(fVolume[volumeIndex].first == NULL)
 215         fVolume[volumeIndex].first = (void *)thisHit;
 216       else
 217         ((AliL3ConfMapPoint *)fVolume[volumeIndex].last)->nextVolumeHit=thisHit;
 218       fVolume[volumeIndex].last = (void *)thisHit;
 219
 220
 221       //set row pointers
 222       if(fRow[(localrow-fRowMin)].first == NULL)
 223         fRow[(localrow-fRowMin)].first = (void *)thisHit;
 224       else
 225         ((AliL3ConfMapPoint *)(fRow[(localrow-fRowMin)].last))->nextRowHit = thisHit;
 226         fRow[(localrow-fRowMin)].last = (void *)thisHit;
 227
 228
 229     }
 230
 231   if(fClustersUnused>0 && local_counter==0)
 232     LOG(AliL3Log::kError,"AliL3ConfMapper::SetPointers","Parameters")
 233       <<AliL3Log::kDec<<"No points passed to track finder, hits out of range: "
 234       <<fEtaHitsOutOfRange+fPhiHitsOutOfRange<<ENDLOG;
 235
 236   LOG(AliL3Log::kInformational,"AliL3ConfMapper::SetPointers","Setup")
 237     <<"Setup finished, hits out of range: "<<fEtaHitsOutOfRange+fPhiHitsOutOfRange
 238     <<" hits accepted "<<fClustersUnused<<ENDLOG;
 239 }
 240
 241 void AliL3ConfMapper::MainVertexTracking_a()
 242 {
 243   //Tracking with vertex constraint.
 244
 245   if(!fParamSet)
 246     {
 247       LOG(AliL3Log::kError,"AliL3ConfMapper::MainVertexTracking","Parameters")<<AliL3Log::kDec<<
 248         "Tracking parameters not set!"<<ENDLOG;
 249       return;
 250     }
 251
 252   Double_t initCpuTime,cpuTime;
 253   initCpuTime = CpuTime();
 254   SetPointers();
 255   SetVertexConstraint(true);
 256   cpuTime = CpuTime() - initCpuTime;
 257   if(fBench)
 258     LOG(AliL3Log::kInformational,"AliL3ConfMapper::MainVertexTracking_a","Timing")
 259       <<AliL3Log::kDec<<"Setup finished in "<<cpuTime*1000<<" ms"<<ENDLOG;
 260
 261 }
 262
 263 void AliL3ConfMapper::MainVertexTracking_b()
 264 {
 265   //Tracking with vertex constraint.
 266
 267   if(!fParamSet)
 268     {
 269       LOG(AliL3Log::kError,"AliL3ConfMapper::MainVertexTracking","Parameters")<<AliL3Log::kDec<<
 270         "Tracking parameters not set!"<<ENDLOG;
 271       return;
 272     }
 273   Double_t initCpuTime,cpuTime;
 274   initCpuTime = CpuTime();
 275
 276   ClusterLoop();
 277
 278   cpuTime = CpuTime() - initCpuTime;
 279   if(fBench)
 280     LOG(AliL3Log::kInformational,"AliL3ConfMapper::MainVertexTracking_b","Timing")
 281       <<AliL3Log::kDec<<"Main Tracking finished in "<<cpuTime*1000<<" ms"<<ENDLOG;
 282 }
 283
 284 void AliL3ConfMapper::MainVertexTracking()
 285 {
 286   //Tracking with vertex constraint.
 287
 288   if(!fParamSet)
 289     {
 290       LOG(AliL3Log::kError,"AliL3ConfMapper::MainVertexTracking","Parameters")<<AliL3Log::kDec<<
 291         "Tracking parameters not set!"<<ENDLOG;
 292       return;
 293     }
 294
 295   Double_t initCpuTime,cpuTime;
 296   initCpuTime = CpuTime();
 297
 298   SetPointers();
 299   SetVertexConstraint(true);
 300
 301   ClusterLoop();
 302
 303   cpuTime = CpuTime() - initCpuTime;
 304   if(fBench)
 305     LOG(AliL3Log::kInformational,"AliL3ConfMapper::MainVertexTracking","Timing")<<AliL3Log::kDec<<
 306       "Tracking finished in "<<cpuTime*1000<<" ms"<<ENDLOG;
 307
 308   return;
 309 }
 310
 311 void AliL3ConfMapper::NonVertexTracking()
 312 {
 313   //Tracking with no vertex constraint. This should be called after doing MainVertexTracking,
 314   //in order to do tracking on the remaining clusters.
 315   //The conformal mapping is now done with respect to the first cluster
 316   //assosciated with this track.
 317
 318   SetVertexConstraint(false);
 319   ClusterLoop();
 320   LOG(AliL3Log::kInformational,"AliL3ConfMapper::NonVertexTracking","ntracks")<<AliL3Log::kDec<<
 321     "Number of nonvertex tracks found: "<<(nTracks-fMainVertexTracks)<<ENDLOG;
 322   return;
 323 }
 324
 325 void AliL3ConfMapper::MainVertexSettings(Int_t trackletlength, Int_t tracklength,
 326                                          Int_t rowscopetracklet, Int_t rowscopetrack,
 327                                          Double_t maxphi,Double_t maxeta)
 328 {
 329   //Settings for main vertex tracking. The cuts are:
 330   //TrackletLength:      #hits on segment, before trying to build a track
 331   //TrackLength:         Minimum hits on a track
 332   //RowScopeTracklet:    Row search range for segments
 333   //RowScopeTrack:       Row search range for tracks
 334
 335   SetTrackletLength(trackletlength,(Bool_t)true);
 336   SetRowScopeTracklet(rowscopetracklet, (Bool_t) true);
 337   SetRowScopeTrack(rowscopetrack, (Bool_t) true);
 338   SetMinPoints(tracklength,(Bool_t)true);
 339   fMaxPhi=maxphi;
 340   fMaxEta=maxeta;
 341 }
 342
 343 void AliL3ConfMapper::NonVertexSettings(Int_t trackletlength, Int_t tracklength,
 344                                         Int_t rowscopetracklet, Int_t rowscopetrack)
 345 {
 346   SetTrackletLength(trackletlength,(Bool_t)false);
 347   SetRowScopeTracklet(rowscopetracklet, (Bool_t)false);
 348   SetRowScopeTrack(rowscopetrack, (Bool_t)false);
 349   SetMinPoints(tracklength,(Bool_t)false);
 350 }
 351
 352 void AliL3ConfMapper::SetTrackCuts(Double_t hitChi2Cut, Double_t goodHitChi2, Double_t trackChi2Cut,Int_t maxdist,
 353                                    Bool_t vertexconstraint)
 354 {
 355   //Settings for tracks. The cuts are:
 356   //HitChi2Cut:     Maximum hit chi2
 357   //goodHitChi2:    Chi2 to stop look for next hit
 358   //trackChi2Cut:   Maximum track chi2
 359   //maxdist:        Maximum distance between two clusters when forming segments
 360
 361   SetHitChi2Cut(hitChi2Cut,vertexconstraint);
 362   SetGoodHitChi2(goodHitChi2,vertexconstraint);
 363   SetTrackChi2Cut(trackChi2Cut,vertexconstraint);
 364   SetMaxDist(maxdist,vertexconstraint);
 365 }
 366
 367 void AliL3ConfMapper::SetTrackletCuts(Double_t maxangle,Double_t goodDist, Bool_t vertex_constraint)
 368 {
 369   //Sets cuts of tracklets. Right now this is only:
 370   //maxangle:  Maximum angle when forming segments (if trackletlength > 2)
 371
 372   fGoodDist=goodDist;
 373   SetMaxAngleTracklet(maxangle, vertex_constraint);
 374 }
 375
 376 void AliL3ConfMapper::ClusterLoop()
 377 {
 378   //Loop over hits, starting at outermost padrow, and trying to build segments.
 379
 380   Int_t row_segm,lastrow = fRowMin + fMinPoints[fVertexConstraint];
 381   AliL3ConfMapPoint *hit;
 382
 383   //Loop over rows, and try to create tracks from the hits.
 384   //Starts at the outermost row, and loops as long as a track can be build, due to length.
 385
 386   for(row_segm = fRowMax; row_segm >= lastrow; row_segm--)
 387     {
 388       if(fRow[(row_segm-fRowMin)].first && ((AliL3ConfMapPoint*)fRow[(row_segm-fRowMin)].first)->GetPadRow() < fRowMin + 1)
 389         break;
 390       for(hit = (AliL3ConfMapPoint*)fRow[(row_segm-fRowMin)].first; hit!=0; hit=hit->nextRowHit)
 391         {
 392           if(hit->GetUsage() == true)
 393             continue;
 394           else
 395             CreateTrack(hit);
 396         }
 397     }
 398
 399   return;
 400 }
 401
 402
 403 void AliL3ConfMapper::CreateTrack(AliL3ConfMapPoint *hit)
 404 {
 405   //Tries to create a track from the initial hit given by ClusterLoop()
 406
 407   AliL3ConfMapPoint *closest_hit = NULL;
 408   AliL3ConfMapTrack *track = NULL;
 409
 410   Int_t point;
 411   Int_t tracks = nTracks;
 412   nTracks++;
 413
 414   track = (AliL3ConfMapTrack*)fTrack->NextTrack();
 415
 416   //reset hit parameters:
 417   track->Reset();
 418
 419   UInt_t *trackhitnumber = track->GetHitNumbers();
 420
 421   //set conformal coordinates if we are looking for non vertex tracks
 422   if(!fVertexConstraint)
 423     {
 424       hit->SetAllCoord(hit);
 425     }
 426
 427   //fill fit parameters of initial track:
 428   track->UpdateParam(hit); //here the number of hits is incremented.
 429   trackhitnumber[track->GetNumberOfPoints()-1] = hit->GetHitNumber();
 430
 431   Double_t dx,dy;
 432   //create tracklets:
 433
 434   for(point=1; point<fTrackletLength[fVertexConstraint]; point++)
 435     {
 436       if((closest_hit = GetNextNeighbor(hit)))
 437         {//closest hit exist
 438
 439           //   Calculate track length in sz plane
 440           dx = ((AliL3ConfMapPoint*)closest_hit)->GetX() - ((AliL3ConfMapPoint*)hit)->GetX();
 441           dy = ((AliL3ConfMapPoint*)closest_hit)->GetY() - ((AliL3ConfMapPoint*)hit)->GetY();
 442           //track->fLength += (Double_t)sqrt ( dx * dx + dy * dy ) ;
 443           Double_t length = track->GetLength()+(Double_t)sqrt ( dx * dx + dy * dy );
 444           track->SetLength(length);
 445
 446           //closest_hit->SetS(track->fLength);
 447           closest_hit->SetS(track->GetLength());
 448
 449           //update fit parameters
 450           track->UpdateParam(closest_hit);
 451           trackhitnumber[track->GetNumberOfPoints()-1] = closest_hit->GetHitNumber();
 452
 453           hit = closest_hit;
 454         }
 455       else
 456         {
 457           //closest hit does not exist:
 458           track->DeleteCandidate();
 459           fTrack->RemoveLast();
 460           nTracks--;
 461           point = fTrackletLength[fVertexConstraint];
 462         }
 463     }
 464
 465   //tracklet is long enough to be extended to a track
 466   if(track->GetNumberOfPoints() == fTrackletLength[fVertexConstraint])
 467     {
 468
 469       track->SetProperties(true);
 470
 471       if(TrackletAngle(track) > fMaxAngleTracklet[fVertexConstraint])
 472         {//proof if the first points seem to be a beginning of a track
 473           track->SetProperties(false);
 474           track->DeleteCandidate();
 475           fTrack->RemoveLast();
 476           nTracks--;
 477         }
 478
 479       else//good tracklet ->proceed, follow the trackfit
 480         {
 481           tracks++;
 482
 483           //define variables to keep the total chi:
 484           Double_t xyChi2 = track->fChiSq[0];
 485           Double_t szChi2 = track->fChiSq[1];
 486
 487           for(point = fTrackletLength[fVertexConstraint]; point <= fNumRowSegment; point++)
 488             {
 489               track->fChiSq[0] = fHitChi2Cut[fVertexConstraint];
 490               closest_hit = GetNextNeighbor((AliL3ConfMapPoint*)track->lastHit,track);
 491
 492               if(closest_hit)
 493                 {
 494
 495                   //keep total chi:
 496                   Double_t lxyChi2 = track->fChiSq[0]-track->fChiSq[1];
 497                   xyChi2 += lxyChi2;
 498                   closest_hit->xyChi2 = lxyChi2;
 499
 500                   //update track length:
 501                   //track->fLength = closest_hit->GetS();
 502                   track->SetLength(closest_hit->GetS());
 503                   szChi2 += track->fChiSq[1];
 504                   closest_hit->szChi2 = track->fChiSq[1];
 505
 506                   track->UpdateParam(closest_hit);
 507                   trackhitnumber[track->GetNumberOfPoints()-1] = closest_hit->GetHitNumber();
 508
 509                   //add closest hit to track
 510                   closest_hit->SetUsage(true);
 511                   closest_hit->SetTrackNumber(tracks-1);
 512
 513                 }//closest_hit
 514
 515               else
 516                 {
 517                   //closest hit does not exist
 518                   point = fNumRowSegment; //continue with next hit in segment
 519                 }//else
 520
 521             }//create tracks
 522
 523           //store track chi2:
 524           track->fChiSq[0] = xyChi2;
 525           track->fChiSq[1] = szChi2;
 526           Double_t normalized_chi2 = (track->fChiSq[0]+track->fChiSq[1])/track->GetNumberOfPoints();
 527
 528           //remove tracks with not enough points already now
 529           if(track->GetNumberOfPoints() < fMinPoints[fVertexConstraint] || normalized_chi2 > fTrackChi2Cut[fVertexConstraint])
 530             {
 531               track->SetProperties(false);
 532               nTracks--;
 533               track->DeleteCandidate();
 534               fTrack->RemoveLast();
 535               tracks--;
 536             }
 537
 538           else
 539             {
 540               fClustersUnused -= track->GetNumberOfPoints();
 541               track->ComesFromMainVertex(fVertexConstraint);
 542               //mark track as main vertex track or not
 543               track->SetSector(2); //only needed for testing purposes.
 544               track->SetRowRange(fRowMin,fRowMax);
 545
 546               if(fVertexConstraint)
 547                 fMainVertexTracks++;
 548             }
 549
 550         }//good tracklet
 551
 552     }
 553
 554   return;
 555 }
 556
 557 AliL3ConfMapPoint *AliL3ConfMapper::GetNextNeighbor(AliL3ConfMapPoint *start_hit,
 558                                           AliL3ConfMapTrack *track)
 559 {
 560   //When forming segments: Finds closest hit to input hit
 561   //When forming tracks: Find closest hit to track fit.
 562
 563   Double_t dist,closest_dist = fMaxDist[fVertexConstraint];
 564
 565   AliL3ConfMapPoint *hit = NULL;
 566   AliL3ConfMapPoint *closest_hit = NULL;
 567
 568   Int_t sub_row_segm;
 569   Int_t sub_phi_segm;
 570   Int_t sub_eta_segm;
 571   Int_t volumeIndex;
 572   Int_t test_hit;
 573
 574   Int_t max_row = start_hit->GetPadRow()-1;
 575   Int_t min_row;
 576
 577   if(track) //finding hit close to trackfit
 578     {
 579       min_row = start_hit->GetPadRow()-fRowScopeTrack[fVertexConstraint];
 580     }
 581   else
 582     {
 583       min_row = start_hit->GetPadRow()-fRowScopeTracklet[fVertexConstraint];
 584     }
 585
 586   //make a smart loop
 587   Int_t loop_eta[9] = {0,0,0,-1,-1,-1,1,1,1};
 588   Int_t loop_phi[9] = {0,-1,1,0,-1,1,0,-1,1};
 589
 590   if(min_row < fRowMin)
 591     min_row = fRowMin;
 592   if(max_row < fRowMin)
 593     return 0;  //reached the last padrow under consideration
 594
 595   else
 596     {
 597       //loop over sub rows
 598       for(sub_row_segm=max_row; sub_row_segm>=min_row; sub_row_segm--)
 599         {
 600           //loop over subsegments, in the order defined above.
 601           for(Int_t i=0; i<9; i++)
 602             {
 603               sub_phi_segm = start_hit->phiIndex + loop_phi[i];
 604
 605               if(sub_phi_segm<0)
 606                 sub_phi_segm += fNumPhiSegment;
 607
 608               else if(sub_phi_segm >=fNumPhiSegment)
 609                 sub_phi_segm -= fNumPhiSegment;
 610
 611               //loop over sub eta segments
 612
 613               sub_eta_segm = start_hit->etaIndex + loop_eta[i];
 614
 615               if(sub_eta_segm < 0 || sub_eta_segm >=fNumEtaSegment)
 616                 continue;//segment exceeds bounds->skip it
 617
 618               //loop over hits in this sub segment:
 619               volumeIndex= (sub_row_segm-fRowMin)*fNumPhiEtaSegmentPlusOne +
 620                 sub_phi_segm*fNumEtaSegmentPlusOne + sub_eta_segm;
 621
 622               if(volumeIndex<0)
 623                 {//debugging
 624                   LOG(AliL3Log::kError,"AliL3ConfMapper::GetNextNeighbor","Memory")<<AliL3Log::kDec<<
 625                     "VolumeIndex error "<<volumeIndex<<ENDLOG;
 626                 }
 627
 628               for(hit = (AliL3ConfMapPoint*)fVolume[volumeIndex].first;
 629                   hit!=0; hit = hit->nextVolumeHit)
 630                 {
 631
 632                   if(!hit->GetUsage())
 633                     {//hit was not used before
 634
 635                       //set conformal mapping if looking for nonvertex tracks:
 636                       if(!fVertexConstraint)
 637                         {
 638                           hit->SetAllCoord(start_hit);
 639                         }
 640
 641                       if(track)//track search - look for nearest neighbor to extrapolated track
 642                         {
 643                           if(!VerifyRange(start_hit,hit))
 644                             continue;
 645
 646                           test_hit = EvaluateHit(start_hit,hit,track);
 647
 648                           if(test_hit == 0)//chi2 not good enough, keep looking
 649                             continue;
 650                           else if(test_hit==2)//chi2 good enough, return it
 651                             return hit;
 652                           else
 653                             closest_hit = hit;//chi2 acceptable, but keep looking
 654
 655                         }//track search
 656
 657                       else //tracklet search, look for nearest neighbor
 658                         {
 659
 660                           if((dist=CalcDistance(start_hit,hit)) < closest_dist)
 661                             {
 662                               if(!VerifyRange(start_hit,hit))
 663                                 continue;
 664                               closest_dist = dist;
 665                               closest_hit = hit;
 666
 667                               //if this hit is good enough, return it:
 668                               if(closest_dist < fGoodDist)
 669                                 return closest_hit;
 670                             }
 671                           else
 672                             continue;//sub hit was farther away than a hit before
 673
 674                         }//tracklet search
 675
 676                     }//hit not used before
 677
 678                   else continue; //sub hit was used before
 679
 680                 }//loop over hits in sub segment
 681
 682             }//loop over sub segments
 683
 684         }//loop over subrows
 685
 686     }//else
 687
 688   //closest hit found:
 689   if(closest_hit)// && closest_dist < mMaxDist)
 690     return closest_hit;
 691   else
 692     return 0;
 693 }
 694
 695 Int_t AliL3ConfMapper::EvaluateHit(AliL3ConfMapPoint *start_hit,AliL3ConfMapPoint *hit,AliL3ConfMapTrack *track)
 696 {
 697   //Check if space point gives a fit with acceptable chi2.
 698
 699   Double_t temp,dxy,lchi2,dx,dy,slocal,dsz,lszChi2;
 700   temp = (track->a2Xy*hit->GetXprime()-hit->GetYprime()+track->a1Xy);
 701   dxy = temp*temp/(track->a2Xy*track->a2Xy + 1.);
 702
 703   //Calculate chi2
 704   lchi2 = (dxy*hit->GetXYWeight());
 705
 706   if(lchi2 > track->fChiSq[0])//chi2 was worse than before.
 707     return 0;
 708
 709   //calculate s and the distance hit-line
 710   dx = start_hit->GetX()-hit->GetX();
 711   dy = start_hit->GetY()-hit->GetY();
 712   //slocal = track->fLength+sqrt(dx*dx+dy*dy);
 713   slocal = track->GetLength()+sqrt(dx*dx+dy*dy);
 714
 715   temp = (track->a2Sz*slocal-hit->GetZ()+track->a1Sz);
 716   dsz = temp*temp/(track->a2Sz*track->a2Sz+1);
 717
 718   //calculate chi2
 719   lszChi2 = dsz*hit->GetZWeight();
 720   lchi2 += lszChi2;
 721
 722
 723   //check whether chi2 is better than previous one:
 724   if(lchi2 < track->fChiSq[0])
 725     {
 726       track->fChiSq[0] = lchi2;
 727       track->fChiSq[1] = lszChi2;
 728
 729       hit->SetS(slocal);
 730
 731       //if chi2 good enough, stop here:
 732       if(lchi2 < fGoodHitChi2[fVertexConstraint])
 733         return 2;
 734
 735       return 1;
 736     }
 737
 738   return 0;
 739
 740 }
 741
 742 Double_t AliL3ConfMapper::CalcDistance(const AliL3ConfMapPoint *hit1,const AliL3ConfMapPoint *hit2) const
 743 {
 744   //Return distance between two clusters, defined by Pablo
 745
 746   Double_t phi_diff = fabs( hit1->GetPhi() - hit2->GetPhi() );
 747   if (phi_diff > pi) phi_diff = twopi - phi_diff;
 748
 749   return todeg*fabs(hit1->GetPadRow() - hit2->GetPadRow()) * (phi_diff + fabs( hit1->GetEta() - hit2->GetEta() ));
 750 }
 751
 752 Bool_t AliL3ConfMapper::VerifyRange(const AliL3ConfMapPoint *hit1,const AliL3ConfMapPoint *hit2) const
 753 {
 754   //Check if the hit are within reasonable range in phi and eta
 755   Double_t dphi,deta;//maxphi=0.1,maxeta=0.1;
 756   dphi = fabs(hit1->GetPhi() - hit2->GetPhi());
 757   if(dphi > pi) dphi = fabs(twopi - dphi);
 758   if(dphi > fMaxPhi) return false;
 759
 760   deta = fabs(hit1->GetEta() - hit2->GetEta());
 761   if(deta > fMaxEta) return false;
 762
 763   return true;
 764
 765 }
 766
 767 Double_t AliL3ConfMapper::TrackletAngle(const AliL3ConfMapTrack *track,Int_t n) const
 768 {
 769   // Returns the angle 'between' the last three points (started at point number n) on this track.
 770
 771   return 0;
 772   /*
 773   Double_t x1[2];
 774   Double_t x2[2];
 775   Double_t angle1,angle2;
 776   TObjArray *hits = track->GetHits();
 777
 778   if (n > track->GetNumberOfPoints()) {
 779     n = track->GetNumberOfPoints();
 780   }
 781
 782   if (n<3)
 783     return 0;
 784
 785
 786   x1[0] = ((AliL3ConfMapPoint *)hits->At(n-2))->GetX() - ((AliL3ConfMapPoint *)hits->At(n-3))->GetX();
 787   x1[1] = ((AliL3ConfMapPoint *)hits->At(n-2))->GetY() - ((AliL3ConfMapPoint *)hits->At(n-3))->GetY();
 788
 789   x2[0] = ((AliL3ConfMapPoint *)hits->At(n-1))->GetX() - ((AliL3ConfMapPoint *)hits->At(n-2))->GetX();
 790   x2[1] = ((AliL3ConfMapPoint *)hits->At(n-1))->GetY() - ((AliL3ConfMapPoint *)hits->At(n-2))->GetY();
 791
 792   angle1 = atan2(x1[1],x1[0]);
 793   angle2 = atan2(x2[1],x1[0]);
 794   return fabs(angle1-angle2);
 795   */
 796 }
 797
 798 Int_t AliL3ConfMapper::FillTracks()
 799 {
 800   //Fill track parameters. Which basically means do a fit of helix in real space,
 801   //which should be done in order to get nice tracks.
 802
 803   Int_t num_of_tracks = nTracks;
 804   LOG(AliL3Log::kInformational,"AliL3ConfMapper::FillTracks","nTracks")<<AliL3Log::kDec<<
 805     "Number of found tracks: "<<nTracks<<ENDLOG;
 806
 807   if(nTracks == 0)
 808     {
 809       LOG(AliL3Log::kError,"AliL3ConfMapper::FillTracks","nTracks")<<AliL3Log::kDec<<
 810         "No tracks found!!"<<ENDLOG;
 811       return 0;
 812     }
 813
 814   //  fTrack->Sort();
 815   for(int i=0; i<num_of_tracks; i++)
 816     {
 817       AliL3ConfMapTrack *track = (AliL3ConfMapTrack*)fTrack->GetTrack(i);
 818       track->Fill(fVertex,fMaxDca);
 819     }
 820   return 1;
 821
 822 }
 823
 824 Double_t AliL3ConfMapper::CpuTime()
 825 {
 826   //Return the Cputime in seconds.
 827  struct timeval tv;
 828  gettimeofday( &tv, NULL );
 829  return tv.tv_sec+(((Double_t)tv.tv_usec)/1000000.);
 830  //return (Double_t)(clock()) / CLOCKS_PER_SEC;
 831 }