[u/mrichter/AliRoot.git] / ITS / AliITSVertexerCosmics.cxx

/**************************************************************************
 * Copyright(c) 1998-2007, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

#include <TClonesArray.h>
#include "AliLog.h"
#include "AliESDVertex.h"
#include "AliRunLoader.h"
#include "AliITSLoader.h"
#include "AliITSgeomTGeo.h"
#include "AliITSRecPoint.h"
#include "AliITSReconstructor.h"
#include "AliITSVertexerCosmics.h"
#include "AliStrLine.h"

//------------------------------------------------------------------------
// This class implements a method to construct a "fake" primary
// vertex for cosmic events in which the muon crosses one of 5 inner
// ITS layers. A fake primary vertex is needed for the reconstruction,
// with e.g. AliITStrackerSA, of the two tracks produced by the muon 
// in the ITS.
//   We build pairs of clusters on a given layer and define the fake vertex as
// the mid-point of the straight line joining the two clusters.
//   We use the innermost layer that has at least two clusters.
//   We reject the background by requiring at least one cluster on the outer
// layer, closer than fMaxDistOnOuterLayer to the tracklet prolongation.
//   We can reject (potentially pathological) events with the muon track
// tangential to the layer by the requiring the radial position of
// the vertex to be smaller than fMaxVtxRadius.
//   Due to background clusters, more than one vertex per event can 
// be found. We consider the first found.
//   The errors on x,y,z of the vertex are calculated as errors on the mean
// of clusters coordinates. Non-diag elements of vertex cov. mat. are set to 0.
//   The number of contributors set in the AliESDVertex object is the
// number of the layer on which the tracklet was built; if this number is -1, 
// the procedure could not find a vertex position and by default 
// the vertex coordinates are set to (0,0,0) with large errors (100,100,100)
//
// Origin: A.Dainese, andrea.dainese@lnl.infn.it
//-------------------------------------------------------------------------

ClassImp(AliITSVertexerCosmics)

//-------------------------------------------------------------------------
AliITSVertexerCosmics::AliITSVertexerCosmics():AliITSVertexer(),
fMaxDistOnOuterLayer(0),
fMinDist2Vtxs(0)
{
  // Default constructor
  SetFirstLastModules(0,0,79);
  SetFirstLastModules(1,80,239);
  SetFirstLastModules(2,240,323);
  SetFirstLastModules(3,324,499);
  SetFirstLastModules(4,500,1247);
  SetFirstLastModules(5,1248,2197);
  SetMaxVtxRadius(0,3.5);
  SetMaxVtxRadius(1,6.5);
  SetMaxVtxRadius(2,14.5);
  SetMaxVtxRadius(3,23.5);
  SetMaxVtxRadius(4,37.5);
  SetMaxVtxRadius(5,42.5);
  /*
  SetMaxVtxRadius(0,5.5);
  SetMaxVtxRadius(1,8.5);
  SetMaxVtxRadius(2,18.5);
  SetMaxVtxRadius(3,28.5);
  SetMaxVtxRadius(4,39.5);
  SetMaxVtxRadius(5,48.5);
  */
  SetMaxDistOnOuterLayer();
  SetMinDist2Vtxs();
}
//--------------------------------------------------------------------------
AliESDVertex* AliITSVertexerCosmics::FindVertexForCurrentEvent(Int_t evnumber) 
{
  // Defines the AliESDVertex for the current event

  fCurrentVertex = 0;
  AliRunLoader *rl =AliRunLoader::GetRunLoader();
  AliITSLoader* itsLoader = (AliITSLoader*)rl->GetLoader("ITSLoader");
  itsLoader->LoadRecPoints();
  rl->GetEvent(evnumber);

  TTree *rpTree = itsLoader->TreeR();

  TClonesArray *recpoints=new TClonesArray("AliITSRecPoint",10000);
  rpTree->SetBranchAddress("ITSRecPoints",&recpoints);

  Int_t lay,lad,det; 

  Double_t pos[3]={0.,0.,0.};
  Double_t err[3]={100.,100.,100.};
  Int_t ncontributors = -1;

  // Search for innermost layer with at least two clusters 
  // on two different modules
  Int_t ilayer=0,ilayer2=0;
  while(ilayer<6) {
    if(AliITSReconstructor::GetRecoParam()->GetLayersToSkip(ilayer)) {
      ilayer++;
      continue;
    }
    Int_t nHitModules=0;
    for(Int_t imodule=fFirst[ilayer]; imodule<=fLast[ilayer]; imodule++) {
      rpTree->GetEvent(imodule);
      AliITSgeomTGeo::GetModuleId(imodule,lay,lad,det);
      lay -= 1;  // AliITSgeomTGeo gives layer from 1 to 6, we want 0 to 5
      if(lay!=ilayer) AliFatal("Layer mismatch!");
      if(recpoints->GetEntriesFast()>0) nHitModules++;
    }
    if(nHitModules>=2) break;
    ilayer++;
  }

  ilayer2=ilayer+1;
  while(ilayer2<6) {
    if(!AliITSReconstructor::GetRecoParam()->GetLayersToSkip(ilayer2)) break;
    ilayer2++;
  }

  //if(ilayer==1 && ilayer2>5 && !AliITSReconstructor::GetRecoParam()->GetLayersToSkip(0)) {ilayer=0; ilayer2=1;}

  if(ilayer>4 || ilayer2>5) {
    AliWarning("Not enough clusters");
    delete recpoints;
    itsLoader->UnloadRecPoints();
    fCurrentVertex = new AliESDVertex(pos,err,"cosmics");
    fCurrentVertex->SetTitle("cosmics fake vertex (failed)");
    fCurrentVertex->SetNContributors(ncontributors);
    return fCurrentVertex;
  }


  const Int_t arrSize = 1000;
  Float_t xclInnLay[arrSize],yclInnLay[arrSize],zclInnLay[arrSize],modclInnLay[arrSize];
  Float_t e2xclInnLay[arrSize],e2yclInnLay[arrSize],e2zclInnLay[arrSize];
  Float_t e2xclOutLay[arrSize],e2yclOutLay[arrSize],e2zclOutLay[arrSize];
  Int_t nclInnLayStored=0;
  Float_t xclOutLay[arrSize],yclOutLay[arrSize],zclOutLay[arrSize],modclOutLay[arrSize];
  Int_t nclOutLayStored=0;
  Int_t nRecPoints,nRecPointsInnLay=0;

  Float_t gc[3],gcov[5];

  Float_t matchOutLayValue;
  Float_t distxyInnLay,distxyInnLayBest=0.;
  Double_t p1[3],p2[3],p3[3];

  Float_t xvtx,yvtx,zvtx,rvtx;
  Int_t i1InnLayBest=-1,i2InnLayBest=-1;


  // Collect clusters in the selected layer and the outer one
  for(Int_t imodule=fFirst[ilayer]; imodule<=fLast[ilayer2]; imodule++) {
    rpTree->GetEvent(imodule);
    AliITSgeomTGeo::GetModuleId(imodule,lay,lad,det);
    lay -= 1; // AliITSgeomTGeo gives layer from 1 to 6, we want 0 to 5
    nRecPoints=recpoints->GetEntriesFast();
    if(imodule<=fLast[ilayer]) nRecPointsInnLay += nRecPoints;
    //printf("cosmics: module %d clusters %d\n",imodule,nRecPoints);
    for(Int_t irp=0; irp<nRecPoints; irp++) {
      AliITSRecPoint *rp=(AliITSRecPoint*)recpoints->UncheckedAt(irp);
      // Local coordinates of this recpoint
      rp->GetGlobalXYZ(gc);
      if(lay==ilayer) { // store InnLay clusters
	xclInnLay[nclInnLayStored]=gc[0];
	yclInnLay[nclInnLayStored]=gc[1];
	zclInnLay[nclInnLayStored]=gc[2];
	rp->GetGlobalCov(gcov);
	e2xclInnLay[nclInnLayStored]=gcov[0];
	e2yclInnLay[nclInnLayStored]=gcov[3];
	e2zclInnLay[nclInnLayStored]=gcov[5];
	modclInnLay[nclInnLayStored]=imodule;
	nclInnLayStored++;
      }
      if(lay==ilayer2) { // store OutLay clusters
	xclOutLay[nclOutLayStored]=gc[0];
	yclOutLay[nclOutLayStored]=gc[1];
	zclOutLay[nclOutLayStored]=gc[2];
	rp->GetGlobalCov(gcov);
	e2xclOutLay[nclOutLayStored]=gcov[0];
	e2yclOutLay[nclOutLayStored]=gcov[3];
	e2zclOutLay[nclOutLayStored]=gcov[5];
	modclOutLay[nclOutLayStored]=imodule;
	nclOutLayStored++;
      }
      if(nclInnLayStored>arrSize || nclOutLayStored>arrSize) {
	//AliFatal("More than arrSize clusters per layer");
	AliWarning("Too many clusters per layer");
	delete recpoints;
	itsLoader->UnloadRecPoints();
	fCurrentVertex = new AliESDVertex(pos,err,"cosmics");
	fCurrentVertex->SetTitle("cosmics fake vertex (failed)");
	fCurrentVertex->SetNContributors(ncontributors);
	return fCurrentVertex;
      }
    }// end clusters in a module
  }// end modules


  Int_t i1InnLay,i2InnLay,iOutLay;

  // build fake vertices
  printf("Building tracklets on layer %d\n",ilayer);

  // InnLay - first cluster
  for(i1InnLay=0; i1InnLay<nclInnLayStored; i1InnLay++) { 
    p1[0]=xclInnLay[i1InnLay]; 
    p1[1]=yclInnLay[i1InnLay]; 
    p1[2]=zclInnLay[i1InnLay];
    // InnLay - second cluster
    for(i2InnLay=i1InnLay+1; i2InnLay<nclInnLayStored; i2InnLay++) { 
      if(modclInnLay[i1InnLay]==modclInnLay[i2InnLay]) continue;
      p2[0]=xclInnLay[i2InnLay]; 
      p2[1]=yclInnLay[i2InnLay]; 
      p2[2]=zclInnLay[i2InnLay];
      // look for point on OutLay
      AliStrLine innLayline(p1,p2,kTRUE);
      for(iOutLay=0; iOutLay<nclOutLayStored; iOutLay++) {
	p3[0]=xclOutLay[iOutLay]; 
	p3[1]=yclOutLay[iOutLay]; 
	p3[2]=zclOutLay[iOutLay];
	//printf(" %f\n",innLayline.GetDistFromPoint(p3));
	matchOutLayValue=innLayline.GetDistFromPoint(p3);
	distxyInnLay = (p1[0]-p2[0])*(p1[0]-p2[0])+(p1[1]-p2[1])*(p1[1]-p2[1]);
	if(matchOutLayValue<fMaxDistOnOuterLayer &&
	   distxyInnLay>distxyInnLayBest) { 
	  distxyInnLayBest=distxyInnLay;
	  i1InnLayBest=i1InnLay;
	  i2InnLayBest=i2InnLay;
	}
      }
    } // InnLay - second cluster
  } // InnLay - first cluster

  if(i1InnLayBest>-1 && i2InnLayBest>-1) { 
    xvtx = 0.5*(xclInnLay[i1InnLayBest]+xclInnLay[i2InnLayBest]);
    yvtx = 0.5*(yclInnLay[i1InnLayBest]+yclInnLay[i2InnLayBest]);
    zvtx = 0.5*(zclInnLay[i1InnLayBest]+zclInnLay[i2InnLayBest]);
    rvtx = TMath::Sqrt(xvtx*xvtx+yvtx*yvtx);
    if(rvtx<fMaxVtxRadius[ilayer]) {
      ncontributors = ilayer;
      pos[0] = xvtx;
      pos[1] = yvtx;
      pos[2] = zvtx;
      err[0]=TMath::Sqrt(0.25*(e2xclInnLay[i1InnLayBest]+e2xclInnLay[i2InnLayBest])); 
      err[1]=TMath::Sqrt(0.25*(e2yclInnLay[i1InnLayBest]+e2yclInnLay[i2InnLayBest])); 
      err[2]=TMath::Sqrt(0.25*(e2zclInnLay[i1InnLayBest]+e2zclInnLay[i2InnLayBest]));
    }
    /*
    fCurrentVertex = new AliESDVertex(pos,err,"cosmics");
    fCurrentVertex->SetTitle("cosmics fake vertex");
    fCurrentVertex->SetNContributors(ncontributors);
    delete recpoints;
    itsLoader->UnloadRecPoints();
    return fCurrentVertex;
    */
  }

  /*
  if(i1InnLayBest==-1 && i2InnLayBest==-1) {
    // give a try exchanging InnLay and OutLay
    // OutLay - first cluster
    for(i1InnLay=0; i1InnLay<nclOutLayStored; i1InnLay++) { 
      p1[0]=xclOutLay[i1InnLay]; 
      p1[1]=yclOutLay[i1InnLay]; 
      p1[2]=zclOutLay[i1InnLay];
      // OutLay - second cluster
      for(i2InnLay=i1InnLay+1; i2InnLay<nclOutLayStored; i2InnLay++) { 
	if(modclOutLay[i1InnLay]==modclOutLay[i2InnLay]) continue;
	p2[0]=xclOutLay[i2InnLay]; 
	p2[1]=yclOutLay[i2InnLay]; 
	p2[2]=zclOutLay[i2InnLay];
	// look for point on InnLay
	AliStrLine outLayline(p1,p2,kTRUE);
	for(iOutLay=0; iOutLay<nclInnLayStored; iOutLay++) {
	  p3[0]=xclInnLay[iOutLay]; 
	  p3[1]=yclInnLay[iOutLay]; 
	  p3[2]=zclInnLay[iOutLay];
	  //printf(" %f\n",InnLayline.GetDistFromPoint(p3));
	  matchOutLayValue=outLayline.GetDistFromPoint(p3);
	  distxyInnLay = (p1[0]-p2[0])*(p1[0]-p2[0])+(p1[1]-p2[1])*(p1[1]-p2[1]);
	  if(matchOutLayValue<fMaxDistOnOuterLayer &&
	     distxyInnLay>distxyInnLayBest) { 
	    distxyInnLayBest=distxyInnLay;
	    i1InnLayBest=i1InnLay;
	    i2InnLayBest=i2InnLay;
	  }
	}
      } // OutLay - second cluster
    } // OutLay - first cluster
  }

  if(i1InnLayBest>-1 && i2InnLayBest>-1) { 
    xvtx = 0.5*(xclOutLay[i1InnLayBest]+xclOutLay[i2InnLayBest]);
    yvtx = 0.5*(yclOutLay[i1InnLayBest]+yclOutLay[i2InnLayBest]);
    zvtx = 0.5*(zclOutLay[i1InnLayBest]+zclOutLay[i2InnLayBest]);
    rvtx = TMath::Sqrt(xvtx*xvtx+yvtx*yvtx);
    if(rvtx<fMaxVtxRadius[ilayer]) {
      ncontributors = ilayer2;
      pos[0] = xvtx;
      pos[1] = yvtx;
      pos[2] = zvtx;
      err[0]=TMath::Sqrt(0.25*(e2xclOutLay[i1InnLayBest]+e2xclOutLay[i2InnLayBest])); 
      err[1]=TMath::Sqrt(0.25*(e2yclOutLay[i1InnLayBest]+e2yclOutLay[i2InnLayBest])); 
      err[2]=TMath::Sqrt(0.25*(e2zclOutLay[i1InnLayBest]+e2zclOutLay[i2InnLayBest]));
    }
  }
  */

  fCurrentVertex = new AliESDVertex(pos,err,"cosmics");
  fCurrentVertex->SetTitle("cosmics fake vertex");
  fCurrentVertex->SetNContributors(ncontributors);
  //fCurrentVertex->Print();

  delete recpoints;
  itsLoader->UnloadRecPoints();

  return fCurrentVertex;
}  
//-------------------------------------------------------------------------
void AliITSVertexerCosmics::FindVertices()
{
  // computes the vertices of the events in the range FirstEvent - LastEvent
  AliRunLoader *rl = AliRunLoader::GetRunLoader();
  AliITSLoader* itsLoader =  (AliITSLoader*) rl->GetLoader("ITSLoader");
  itsLoader->ReloadRecPoints();
  for(Int_t i=fFirstEvent;i<=fLastEvent;i++){
    //  printf("Processing event %d\n",i);
    rl->GetEvent(i);
    FindVertexForCurrentEvent(i);
    if(fCurrentVertex){
      WriteCurrentVertex();
    }
  }
}
//-------------------------------------------------------------------------
void AliITSVertexerCosmics::PrintStatus() const 
{
  // Print current status
  printf("=======================================================\n");
  printf(" fMaxDistOnOuterLayer: %f\n",fMaxDistOnOuterLayer);
  printf(" fMaxVtxRadius[0]:  %f\n",fMaxVtxRadius[0]);
  printf(" fMinDist2Vtxs:  %f\n",fMinDist2Vtxs);
  printf("=======================================================\n");
}
//-------------------------------------------------------------------------
Commit	Line	Data
3acc14d5	1	/**************************************************************************
	2	* Copyright(c) 1998-2007, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	#include <TClonesArray.h>
	17	#include "AliLog.h"
	18	#include "AliESDVertex.h"
	19	#include "AliRunLoader.h"
	20	#include "AliITSLoader.h"
0333e459	21	#include "AliITSgeomTGeo.h"
3acc14d5	22	#include "AliITSRecPoint.h"
81ba01de	23	#include "AliITSReconstructor.h"
3acc14d5	24	#include "AliITSVertexerCosmics.h"
	25	#include "AliStrLine.h"
	26
	27	//------------------------------------------------------------------------
	28	// This class implements a method to construct a "fake" primary
b8ed1a92	29	// vertex for cosmic events in which the muon crosses one of 5 inner
b8ed1a92	30	// ITS layers. A fake primary vertex is needed for the reconstruction,
3acc14d5	31	// with e.g. AliITStrackerSA, of the two tracks produced by the muon
3acc14d5	32	// in the ITS.
b8ed1a92	33	// We build pairs of clusters on a given layer and define the fake vertex as
3acc14d5	34	// the mid-point of the straight line joining the two clusters.
b8ed1a92	35	// We use the innermost layer that has at least two clusters.
	36	// We reject the background by requiring at least one cluster on the outer
	37	// layer, closer than fMaxDistOnOuterLayer to the tracklet prolongation.
3acc14d5	38	// We can reject (potentially pathological) events with the muon track
b8ed1a92	39	// tangential to the layer by the requiring the radial position of
3acc14d5	40	// the vertex to be smaller than fMaxVtxRadius.
	41	// Due to background clusters, more than one vertex per event can
	42	// be found. We consider the first found.
b8ed1a92	43	// The errors on x,y,z of the vertex are calculated as errors on the mean
b8ed1a92	44	// of clusters coordinates. Non-diag elements of vertex cov. mat. are set to 0.
3acc14d5	45	// The number of contributors set in the AliESDVertex object is the
b8ed1a92	46	// number of the layer on which the tracklet was built; if this number is -1,
3acc14d5	47	// the procedure could not find a vertex position and by default
3acc14d5	48	// the vertex coordinates are set to (0,0,0) with large errors (100,100,100)
3acc14d5	49	//
	50	// Origin: A.Dainese, andrea.dainese@lnl.infn.it
	51	//-------------------------------------------------------------------------
	52
	53	ClassImp(AliITSVertexerCosmics)
	54
	55	//-------------------------------------------------------------------------
	56	AliITSVertexerCosmics::AliITSVertexerCosmics():AliITSVertexer(),
b8ed1a92	57	fMaxDistOnOuterLayer(0),
3acc14d5	58	fMinDist2Vtxs(0)
	59	{
	60	// Default constructor
b8ed1a92	61	SetFirstLastModules(0,0,79);
	62	SetFirstLastModules(1,80,239);
	63	SetFirstLastModules(2,240,323);
	64	SetFirstLastModules(3,324,499);
	65	SetFirstLastModules(4,500,1247);
	66	SetFirstLastModules(5,1248,2197);
	67	SetMaxVtxRadius(0,3.5);
	68	SetMaxVtxRadius(1,6.5);
	69	SetMaxVtxRadius(2,14.5);
	70	SetMaxVtxRadius(3,23.5);
	71	SetMaxVtxRadius(4,37.5);
	72	SetMaxVtxRadius(5,42.5);
81ba01de	73	/*
	74	SetMaxVtxRadius(0,5.5);
	75	SetMaxVtxRadius(1,8.5);
	76	SetMaxVtxRadius(2,18.5);
	77	SetMaxVtxRadius(3,28.5);
	78	SetMaxVtxRadius(4,39.5);
	79	SetMaxVtxRadius(5,48.5);
	80	*/
b8ed1a92	81	SetMaxDistOnOuterLayer();
3acc14d5	82	SetMinDist2Vtxs();
	83	}
	84	//--------------------------------------------------------------------------
	85	AliESDVertex* AliITSVertexerCosmics::FindVertexForCurrentEvent(Int_t evnumber)
	86	{
	87	// Defines the AliESDVertex for the current event
	88
	89	fCurrentVertex = 0;
	90	AliRunLoader *rl =AliRunLoader::GetRunLoader();
	91	AliITSLoader* itsLoader = (AliITSLoader*)rl->GetLoader("ITSLoader");
3acc14d5	92	itsLoader->LoadRecPoints();
	93	rl->GetEvent(evnumber);
	94
	95	TTree *rpTree = itsLoader->TreeR();
	96
	97	TClonesArray *recpoints=new TClonesArray("AliITSRecPoint",10000);
	98	rpTree->SetBranchAddress("ITSRecPoints",&recpoints);
	99
3acc14d5	100	Int_t lay,lad,det;
3acc14d5	101
81ba01de	102	Double_t pos[3]={0.,0.,0.};
	103	Double_t err[3]={100.,100.,100.};
	104	Int_t ncontributors = -1;
	105
b8ed1a92	106	// Search for innermost layer with at least two clusters
b8ed1a92	107	// on two different modules
81ba01de	108	Int_t ilayer=0,ilayer2=0;
b8ed1a92	109	while(ilayer<6) {
81ba01de	110	if(AliITSReconstructor::GetRecoParam()->GetLayersToSkip(ilayer)) {
	111	ilayer++;
	112	continue;
	113	}
b8ed1a92	114	Int_t nHitModules=0;
	115	for(Int_t imodule=fFirst[ilayer]; imodule<=fLast[ilayer]; imodule++) {
	116	rpTree->GetEvent(imodule);
	117	AliITSgeomTGeo::GetModuleId(imodule,lay,lad,det);
	118	lay -= 1; // AliITSgeomTGeo gives layer from 1 to 6, we want 0 to 5
	119	if(lay!=ilayer) AliFatal("Layer mismatch!");
	120	if(recpoints->GetEntriesFast()>0) nHitModules++;
	121	}
	122	if(nHitModules>=2) break;
	123	ilayer++;
	124	}
81ba01de	125
	126	ilayer2=ilayer+1;
	127	while(ilayer2<6) {
	128	if(!AliITSReconstructor::GetRecoParam()->GetLayersToSkip(ilayer2)) break;
	129	ilayer2++;
	130	}
	131
	132	//if(ilayer==1 && ilayer2>5 && !AliITSReconstructor::GetRecoParam()->GetLayersToSkip(0)) {ilayer=0; ilayer2=1;}
	133
	134	if(ilayer>4 \|\| ilayer2>5) {
	135	AliWarning("Not enough clusters");
	136	delete recpoints;
	137	itsLoader->UnloadRecPoints();
	138	fCurrentVertex = new AliESDVertex(pos,err,"cosmics");
	139	fCurrentVertex->SetTitle("cosmics fake vertex (failed)");
	140	fCurrentVertex->SetNContributors(ncontributors);
	141	return fCurrentVertex;
	142	}
	143
b8ed1a92	144
a1fca0e6	145	const Int_t arrSize = 1000;
	146	Float_t xclInnLay[arrSize],yclInnLay[arrSize],zclInnLay[arrSize],modclInnLay[arrSize];
	147	Float_t e2xclInnLay[arrSize],e2yclInnLay[arrSize],e2zclInnLay[arrSize];
81ba01de	148	Float_t e2xclOutLay[arrSize],e2yclOutLay[arrSize],e2zclOutLay[arrSize];
b8ed1a92	149	Int_t nclInnLayStored=0;
a1fca0e6	150	Float_t xclOutLay[arrSize],yclOutLay[arrSize],zclOutLay[arrSize],modclOutLay[arrSize];
b8ed1a92	151	Int_t nclOutLayStored=0;
	152	Int_t nRecPoints,nRecPointsInnLay=0;
	153
	154	Float_t gc[3],gcov[5];
	155
81ba01de	156	Float_t matchOutLayValue;
81ba01de	157	Float_t distxyInnLay,distxyInnLayBest=0.;
b8ed1a92	158	Double_t p1[3],p2[3],p3[3];
81ba01de	159
b8ed1a92	160	Float_t xvtx,yvtx,zvtx,rvtx;
81ba01de	161	Int_t i1InnLayBest=-1,i2InnLayBest=-1;
3acc14d5	162
b107ee21	163
b8ed1a92	164	// Collect clusters in the selected layer and the outer one
81ba01de	165	for(Int_t imodule=fFirst[ilayer]; imodule<=fLast[ilayer2]; imodule++) {
3acc14d5	166	rpTree->GetEvent(imodule);
0333e459	167	AliITSgeomTGeo::GetModuleId(imodule,lay,lad,det);
b8ed1a92	168	lay -= 1; // AliITSgeomTGeo gives layer from 1 to 6, we want 0 to 5
	169	nRecPoints=recpoints->GetEntriesFast();
	170	if(imodule<=fLast[ilayer]) nRecPointsInnLay += nRecPoints;
	171	//printf("cosmics: module %d clusters %d\n",imodule,nRecPoints);
	172	for(Int_t irp=0; irp<nRecPoints; irp++) {
3acc14d5	173	AliITSRecPoint rp=(AliITSRecPoint)recpoints->UncheckedAt(irp);
3acc14d5	174	// Local coordinates of this recpoint
b8ed1a92	175	rp->GetGlobalXYZ(gc);
	176	if(lay==ilayer) { // store InnLay clusters
	177	xclInnLay[nclInnLayStored]=gc[0];
	178	yclInnLay[nclInnLayStored]=gc[1];
	179	zclInnLay[nclInnLayStored]=gc[2];
	180	rp->GetGlobalCov(gcov);
	181	e2xclInnLay[nclInnLayStored]=gcov[0];
	182	e2yclInnLay[nclInnLayStored]=gcov[3];
	183	e2zclInnLay[nclInnLayStored]=gcov[5];
	184	modclInnLay[nclInnLayStored]=imodule;
	185	nclInnLayStored++;
3acc14d5	186	}
81ba01de	187	if(lay==ilayer2) { // store OutLay clusters
b8ed1a92	188	xclOutLay[nclOutLayStored]=gc[0];
	189	yclOutLay[nclOutLayStored]=gc[1];
	190	zclOutLay[nclOutLayStored]=gc[2];
81ba01de	191	rp->GetGlobalCov(gcov);
	192	e2xclOutLay[nclOutLayStored]=gcov[0];
	193	e2yclOutLay[nclOutLayStored]=gcov[3];
	194	e2zclOutLay[nclOutLayStored]=gcov[5];
b8ed1a92	195	modclOutLay[nclOutLayStored]=imodule;
b8ed1a92	196	nclOutLayStored++;
3acc14d5	197	}
b107ee21	198	if(nclInnLayStored>arrSize \|\| nclOutLayStored>arrSize) {
	199	//AliFatal("More than arrSize clusters per layer");
	200	AliWarning("Too many clusters per layer");
	201	delete recpoints;
	202	itsLoader->UnloadRecPoints();
	203	fCurrentVertex = new AliESDVertex(pos,err,"cosmics");
	204	fCurrentVertex->SetTitle("cosmics fake vertex (failed)");
	205	fCurrentVertex->SetNContributors(ncontributors);
	206	return fCurrentVertex;
	207	}
3acc14d5	208	}// end clusters in a module
b8ed1a92	209	}// end modules
3acc14d5	210
81ba01de	211
	212	Int_t i1InnLay,i2InnLay,iOutLay;
	213
3acc14d5	214	// build fake vertices
81ba01de	215	printf("Building tracklets on layer %d\n",ilayer);
81ba01de	216
b8ed1a92	217	// InnLay - first cluster
81ba01de	218	for(i1InnLay=0; i1InnLay<nclInnLayStored; i1InnLay++) {
b8ed1a92	219	p1[0]=xclInnLay[i1InnLay];
	220	p1[1]=yclInnLay[i1InnLay];
	221	p1[2]=zclInnLay[i1InnLay];
	222	// InnLay - second cluster
81ba01de	223	for(i2InnLay=i1InnLay+1; i2InnLay<nclInnLayStored; i2InnLay++) {
b8ed1a92	224	if(modclInnLay[i1InnLay]==modclInnLay[i2InnLay]) continue;
	225	p2[0]=xclInnLay[i2InnLay];
	226	p2[1]=yclInnLay[i2InnLay];
	227	p2[2]=zclInnLay[i2InnLay];
	228	// look for point on OutLay
81ba01de	229	AliStrLine innLayline(p1,p2,kTRUE);
81ba01de	230	for(iOutLay=0; iOutLay<nclOutLayStored; iOutLay++) {
b8ed1a92	231	p3[0]=xclOutLay[iOutLay];
	232	p3[1]=yclOutLay[iOutLay];
	233	p3[2]=zclOutLay[iOutLay];
81ba01de	234	//printf(" %f\n",innLayline.GetDistFromPoint(p3));
	235	matchOutLayValue=innLayline.GetDistFromPoint(p3);
	236	distxyInnLay = (p1[0]-p2[0])(p1[0]-p2[0])+(p1[1]-p2[1])(p1[1]-p2[1]);
	237	if(matchOutLayValue<fMaxDistOnOuterLayer &&
	238	distxyInnLay>distxyInnLayBest) {
	239	distxyInnLayBest=distxyInnLay;
	240	i1InnLayBest=i1InnLay;
	241	i2InnLayBest=i2InnLay;
	242	}
3acc14d5	243	}
b8ed1a92	244	} // InnLay - second cluster
b8ed1a92	245	} // InnLay - first cluster
3acc14d5	246
81ba01de	247	if(i1InnLayBest>-1 && i2InnLayBest>-1) {
	248	xvtx = 0.5*(xclInnLay[i1InnLayBest]+xclInnLay[i2InnLayBest]);
	249	yvtx = 0.5*(yclInnLay[i1InnLayBest]+yclInnLay[i2InnLayBest]);
	250	zvtx = 0.5*(zclInnLay[i1InnLayBest]+zclInnLay[i2InnLayBest]);
	251	rvtx = TMath::Sqrt(xvtxxvtx+yvtxyvtx);
	252	if(rvtx<fMaxVtxRadius[ilayer]) {
	253	ncontributors = ilayer;
	254	pos[0] = xvtx;
	255	pos[1] = yvtx;
	256	pos[2] = zvtx;
	257	err[0]=TMath::Sqrt(0.25*(e2xclInnLay[i1InnLayBest]+e2xclInnLay[i2InnLayBest]));
	258	err[1]=TMath::Sqrt(0.25*(e2yclInnLay[i1InnLayBest]+e2yclInnLay[i2InnLayBest]));
	259	err[2]=TMath::Sqrt(0.25*(e2zclInnLay[i1InnLayBest]+e2zclInnLay[i2InnLayBest]));
	260	}
	261	/*
	262	fCurrentVertex = new AliESDVertex(pos,err,"cosmics");
	263	fCurrentVertex->SetTitle("cosmics fake vertex");
	264	fCurrentVertex->SetNContributors(ncontributors);
	265	delete recpoints;
	266	itsLoader->UnloadRecPoints();
	267	return fCurrentVertex;
	268	*/
	269	}
	270
	271	/*
	272	if(i1InnLayBest==-1 && i2InnLayBest==-1) {
	273	// give a try exchanging InnLay and OutLay
	274	// OutLay - first cluster
	275	for(i1InnLay=0; i1InnLay<nclOutLayStored; i1InnLay++) {
	276	p1[0]=xclOutLay[i1InnLay];
	277	p1[1]=yclOutLay[i1InnLay];
	278	p1[2]=zclOutLay[i1InnLay];
	279	// OutLay - second cluster
	280	for(i2InnLay=i1InnLay+1; i2InnLay<nclOutLayStored; i2InnLay++) {
	281	if(modclOutLay[i1InnLay]==modclOutLay[i2InnLay]) continue;
	282	p2[0]=xclOutLay[i2InnLay];
	283	p2[1]=yclOutLay[i2InnLay];
	284	p2[2]=zclOutLay[i2InnLay];
	285	// look for point on InnLay
	286	AliStrLine outLayline(p1,p2,kTRUE);
	287	for(iOutLay=0; iOutLay<nclInnLayStored; iOutLay++) {
	288	p3[0]=xclInnLay[iOutLay];
	289	p3[1]=yclInnLay[iOutLay];
	290	p3[2]=zclInnLay[iOutLay];
	291	//printf(" %f\n",InnLayline.GetDistFromPoint(p3));
	292	matchOutLayValue=outLayline.GetDistFromPoint(p3);
	293	distxyInnLay = (p1[0]-p2[0])(p1[0]-p2[0])+(p1[1]-p2[1])(p1[1]-p2[1]);
	294	if(matchOutLayValue<fMaxDistOnOuterLayer &&
	295	distxyInnLay>distxyInnLayBest) {
	296	distxyInnLayBest=distxyInnLay;
	297	i1InnLayBest=i1InnLay;
	298	i2InnLayBest=i2InnLay;
	299	}
	300	}
	301	} // OutLay - second cluster
	302	} // OutLay - first cluster
	303	}
	304
	305	if(i1InnLayBest>-1 && i2InnLayBest>-1) {
	306	xvtx = 0.5*(xclOutLay[i1InnLayBest]+xclOutLay[i2InnLayBest]);
	307	yvtx = 0.5*(yclOutLay[i1InnLayBest]+yclOutLay[i2InnLayBest]);
	308	zvtx = 0.5*(zclOutLay[i1InnLayBest]+zclOutLay[i2InnLayBest]);
	309	rvtx = TMath::Sqrt(xvtxxvtx+yvtxyvtx);
	310	if(rvtx<fMaxVtxRadius[ilayer]) {
311	ncontributors = ilayer2;
312	pos[0] = xvtx;
313	pos[1] = yvtx;
314	pos[2] = zvtx;
315	err[0]=TMath::Sqrt(0.25*(e2xclOutLay[i1InnLayBest]+e2xclOutLay[i2InnLayBest]));
316	err[1]=TMath::Sqrt(0.25*(e2yclOutLay[i1InnLayBest]+e2yclOutLay[i2InnLayBest]));
317	err[2]=TMath::Sqrt(0.25*(e2zclOutLay[i1InnLayBest]+e2zclOutLay[i2InnLayBest]));
318	}
3acc14d5	319	}
81ba01de	320	*/
b107ee21	321
3acc14d5	322	fCurrentVertex = new AliESDVertex(pos,err,"cosmics");
3acc14d5	323	fCurrentVertex->SetTitle("cosmics fake vertex");
b107ee21	324	fCurrentVertex->SetNContributors(ncontributors);
b107ee21	325	//fCurrentVertex->Print();
3acc14d5	326
	327	delete recpoints;
	328	itsLoader->UnloadRecPoints();
	329
	330	return fCurrentVertex;
	331	}
	332	//-------------------------------------------------------------------------
	333	void AliITSVertexerCosmics::FindVertices()
	334	{
	335	// computes the vertices of the events in the range FirstEvent - LastEvent
	336	AliRunLoader *rl = AliRunLoader::GetRunLoader();
	337	AliITSLoader* itsLoader = (AliITSLoader*) rl->GetLoader("ITSLoader");
	338	itsLoader->ReloadRecPoints();
	339	for(Int_t i=fFirstEvent;i<=fLastEvent;i++){
	340	// printf("Processing event %d\n",i);
	341	rl->GetEvent(i);
	342	FindVertexForCurrentEvent(i);
	343	if(fCurrentVertex){
	344	WriteCurrentVertex();
	345	}
	346	}
	347	}
	348	//-------------------------------------------------------------------------
	349	void AliITSVertexerCosmics::PrintStatus() const
	350	{
	351	// Print current status
	352	printf("=======================================================\n");
b8ed1a92	353	printf(" fMaxDistOnOuterLayer: %f\n",fMaxDistOnOuterLayer);
b8ed1a92	354	printf(" fMaxVtxRadius[0]: %f\n",fMaxVtxRadius[0]);
3acc14d5	355	printf(" fMinDist2Vtxs: %f\n",fMinDist2Vtxs);
3acc14d5	356	printf("=======================================================\n");
	357	}
	358	//-------------------------------------------------------------------------