[u/mrichter/AliRoot.git] / STEER / AliTrackFitterRieman.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, 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.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//
// Class to the track points on the Riemann sphere. Inputs are
// the set of id's (volids) of the volumes in which residuals are
// calculated to construct a chi2 function to be minimized during 
// the alignment procedures. For the moment the track extrapolation is 
// taken at the space-point reference plane. The reference plane is
// found using the covariance matrix of the point
// (assuming sigma(x)=0 at the reference coordinate system.
//
// Internal usage of AliRieman class for minimization
//
//////////////////////////////////////////////////////////////////////////////

#include "TMatrixDSym.h"
#include "TMatrixD.h"
#include "TArrayI.h"
#include "AliTrackFitterRieman.h"
#include "AliLog.h"
#include "TTreeStream.h"
#include "AliRieman.h"
#include "AliLog.h"

ClassImp(AliTrackFitterRieman)


AliTrackFitterRieman::AliTrackFitterRieman():
  AliTrackFitter()
{
  //
  // default constructor
  //
  fAlpha = 0.;
  fNUsed = 0;
  fConv = kFALSE;
  fMaxDelta = 3;
  fDebugStream = new TTreeSRedirector("RiemanAlignDebug.root");
  fRieman = new AliRieman(10000);  // allocate rieman
}


AliTrackFitterRieman::AliTrackFitterRieman(AliTrackPointArray *array, Bool_t owner):
  AliTrackFitter(array,owner)
{
  //
  // Constructor
  //
  fAlpha = 0.;
  fNUsed = 0;
  fConv = kFALSE;
  fMaxDelta = 3;
  if (AliLog::GetDebugLevel("","AliTrackFitterRieman")) fDebugStream = new TTreeSRedirector("RiemanAlignDebug.root");
  fRieman = new AliRieman(10000);  //allocate rieman
}

AliTrackFitterRieman::AliTrackFitterRieman(const AliTrackFitterRieman &rieman):
  AliTrackFitter(rieman)
{
  //
  // copy constructor
  //
  fAlpha = rieman.fAlpha;
  fNUsed = rieman.fNUsed;
  fConv = rieman.fConv;
  fMaxDelta = rieman.fMaxDelta;
  fRieman = new AliRieman(*(rieman.fRieman));
}

//_____________________________________________________________________________
AliTrackFitterRieman &AliTrackFitterRieman::operator =(const AliTrackFitterRieman& rieman)
{
  //
  // Assignment operator
  //
  if(this==&rieman) return *this;
  ((AliTrackFitter *)this)->operator=(rieman);

  fAlpha  = rieman.fAlpha;
  fNUsed  = rieman.fNUsed;
  fConv   = rieman.fConv;
  fMaxDelta = rieman.fMaxDelta;
  fRieman = new AliRieman(*(rieman.fRieman));
  return *this;
}


AliTrackFitterRieman::~AliTrackFitterRieman(){
  //
  //
  //
  delete fRieman;
  delete fDebugStream;
}

void AliTrackFitterRieman::Reset()
{
  // Reset the track parameters and
  // rieman sums
  //
  AliTrackFitter::Reset();
  fRieman->Reset();
  fAlpha = 0.;
  fNUsed = 0;
  fConv =kFALSE;
}

Bool_t AliTrackFitterRieman::Fit(const TArrayI *volIds,const TArrayI *volIdsFit,
				 AliAlignObj::ELayerID layerRangeMin,
			 AliAlignObj::ELayerID layerRangeMax)
{
  // Fit the track points. The method takes as an input
  // the set of id's (volids) of the volumes in which
  // one wants to calculate the residuals.
  // The following parameters are used to define the
  // range of volumes to be used in the fitting
  // As a result two AliTrackPointArray's obects are filled.
  // The first one contains the space points with
  // volume id's from volids list. The second array of points represents
  // the track extrapolations corresponding to the space points
  // in the first array. The two arrays can be used to find
  // the residuals in the volids and consequently construct a
  // chi2 function to be minimized during the alignment
  // procedures. For the moment the track extrapolation is taken
  // at the space-point reference plane. The reference plane is
  // found using the covariance matrix of the point
  // (assuming sigma(x)=0 at the reference coordinate system.

  Reset();
  Int_t npoints = fPoints->GetNPoints();
  if (fPoints && AliLog::GetDebugLevel("","AliTrackFitterRieman")>1){
    Int_t nVol    = volIds->GetSize();
    Int_t nVolFit = volIdsFit->GetSize();
    Int_t volId  = volIds->At(0);    
    (*fDebugStream)<<"PInput"<<
      "NPoints="<<npoints<<    // number of points
      "VolId="<<volId<<        // first vol ID
      "NVol="<<nVol<<          // number of volumes 
      "NvolFit="<<nVolFit<<    // number of volumes to fit
      "fPoints.="<<fPoints<<   // input points
      "\n";
  }
  if (npoints < 3) return kFALSE;

  Bool_t isAlphaCalc = kFALSE;
  AliTrackPoint p,plocal;
//   fPoints->GetPoint(p,0);
//   fAlpha = TMath::ATan2(p.GetY(),p.GetX());

  Int_t npVolId = 0;
  fNUsed = 0;
  Int_t *pindex = new Int_t[npoints];
  for (Int_t ipoint = 0; ipoint < npoints; ipoint++)
    {
      fPoints->GetPoint(p,ipoint);
      UShort_t iVolId = p.GetVolumeID();
      if (FindVolId(volIds,iVolId)) {
	pindex[npVolId] = ipoint;
	npVolId++;
      }
      if (volIdsFit != 0x0) {
	if (!FindVolId(volIdsFit,iVolId)) continue;
      }
      else {
	if (iVolId < AliAlignObj::LayerToVolUID(layerRangeMin,0) ||
	    iVolId > AliAlignObj::LayerToVolUID(layerRangeMax,
						AliAlignObj::LayerSize(layerRangeMax))) continue;
      }
      if (!isAlphaCalc) {
	fAlpha = p.GetAngle();
	isAlphaCalc = kTRUE;
      }
      plocal = p.Rotate(fAlpha);
      if (TMath::Abs(plocal.GetX())>500 || TMath::Abs(plocal.GetX())<2 || plocal.GetCov()[3]<=0 ||plocal.GetCov()[5]<=0 ){
	printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<</n");
	p.Dump();
	plocal.Dump();
	printf("Problematic point\n");	
	printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<</n");
      }else{
	AddPoint(plocal.GetX(),plocal.GetY(),plocal.GetZ(),
		 TMath::Sqrt(plocal.GetCov()[3]),TMath::Sqrt(plocal.GetCov()[5]));
      }
      // fNUsed++;  AddPoint should be responsible
    }

  if (npVolId == 0 || fNUsed < fMinNPoints) {
    delete [] pindex;
    return kFALSE;
  }

  Update();
 
  if (!fConv) {
    delete [] pindex;
    return kFALSE;
  }

  if ((fParams[0] == 0) ||
      ((-fParams[2]*fParams[0]+fParams[1]*fParams[1]+1) <= 0)) {
    delete [] pindex;
    return kFALSE;
  }


  if (fNUsed < fMinNPoints) {
    delete [] pindex;
    return kFALSE;
  }

  fPVolId = new AliTrackPointArray(npVolId);
  fPTrack = new AliTrackPointArray(npVolId);
  AliTrackPoint p2;
  for (Int_t ipoint = 0; ipoint < npVolId; ipoint++)
    {
      Int_t index = pindex[ipoint];
      fPoints->GetPoint(p,index);
      if (GetPCA(p,p2) && (
	  TMath::Abs(p.GetX()-p2.GetX())<fMaxDelta && 
	  TMath::Abs(p.GetY()-p2.GetY())<fMaxDelta &&
	  TMath::Abs(p.GetZ()-p2.GetZ())<fMaxDelta
	  )) {
	Float_t xyz[3],xyz2[3];
	p.GetXYZ(xyz); p2.GetXYZ(xyz2);
	//	printf("residuals %f %d %d %f %f %f %f %f %f\n",fChi2,fNUsed,fConv,xyz[0],xyz[1],xyz[2],xyz2[0]-xyz[0],xyz2[1]-xyz[1],xyz2[2]-xyz[2]);	
	fPVolId->AddPoint(ipoint,&p);
	fPTrack->AddPoint(ipoint,&p2);
      }else{
	// what should be default bahavior -  
	delete [] pindex;
	delete fPVolId;
	delete fPTrack;
	fPVolId =0;
	fPTrack =0;
	return kFALSE;
      }
    }  
  
  if (AliLog::GetDebugLevel("","AliTrackFitterRieman")>0){
    //
    // Debug Info
    //
    AliTrackPointArray *lPVolId = new AliTrackPointArray(npVolId);
    AliTrackPointArray *lPTrack = new AliTrackPointArray(npVolId);
    AliRieman * residual = fRieman->MakeResiduals();
    AliTrackPoint p2local;
    for (Int_t ipoint = 0; ipoint < npVolId; ipoint++){
      Int_t index = pindex[ipoint];
      fPoints->GetPoint(p,index); 
      if (GetPCA(p,p2)) {
	plocal = p.Rotate(fAlpha);
	//	plocal.Rotate(fAlpha);
	Float_t xyz[3],xyz2[3];
	p2local = plocal;
	plocal.GetXYZ(xyz); 
	xyz2[0] = xyz[0];
	xyz2[1] = GetYat(xyz[0]); 
	xyz2[2] = GetZat(xyz[0]); 
	p2local.SetXYZ(xyz2);
	lPVolId->AddPoint(ipoint,&plocal);
	lPTrack->AddPoint(ipoint,&p2local);
      }
    }      
    //
    // debug info
    //
    Int_t nVol    = volIds->GetSize();
    Int_t nVolFit = volIdsFit->GetSize();
    Int_t volId   = volIds->At(0);   
    Int_t modId   =0;
    Int_t layer   =  AliAlignObj::VolUIDToLayer(volId,modId);
    
    (*fDebugStream)<<"Fit"<<
      "VolId="<<volId<<        // volume ID
      "Layer="<<layer<<        // layer ID
      "Module="<<modId<<       // module ID
      "NVol="<<nVol<<          // number of volumes 
      "NvolFit="<<nVolFit<<    // number of volumes to fit
      "Points0.="<<fPVolId<<    // original points
      "Points1.="<<fPTrack<<    // fitted points 
      "LPoints0.="<<lPVolId<<   // original points - local frame
      "LPoints1.="<<lPTrack<<   // fitted points   - local frame      
      "Rieman.="<<this<<        // original rieman fit
      "Res.="<<residual<<       // residuals of rieman fit  
      "\n";
    delete lPVolId;
    delete lPTrack;
    delete residual;
  }

  delete [] pindex;
  return kTRUE;
}


void AliTrackFitterRieman::AddPoint(Float_t x, Float_t y, Float_t z, Float_t sy, Float_t sz)
{
  //
  // add point to rieman fitter
  //
  fRieman->AddPoint(x,y,z,sy,sz);
  fNUsed = fRieman->GetN();
}


void AliTrackFitterRieman::Update(){
  //
  // 
  //
  fRieman->Update();
  fConv = kFALSE;
  if (fRieman->IsValid()){
    for (Int_t ipar=0; ipar<6; ipar++){
      fParams[ipar] = fRieman->GetParam()[ipar];
    }
    fChi2  =  fRieman->GetChi2();
    fNdf   =  fRieman->GetN()- 2;
    fNUsed =  fRieman->GetN();
    fConv = kTRUE;
  }
}

//_____________________________________________________________________________
Bool_t AliTrackFitterRieman::GetPCA(const AliTrackPoint &p, AliTrackPoint &p2) const
{
  //
  // Get the closest to a given spacepoint track trajectory point
  // Look for details in the description of the Fit() method
  //
  if (!fConv) return kFALSE;

  // First X and Y coordinates
  Double_t sin = TMath::Sin(fAlpha);
  Double_t cos = TMath::Cos(fAlpha);
  //  fParam[0]  = 1/y0
  //  fParam[1]  = -x0/y0
  //  fParam[2]  = - (R^2 - x0^2 - y0^2)/y0
  if (fParams[0] == 0) return kFALSE;
  // Track parameters in the global coordinate system
  Double_t x0 = -fParams[1]/fParams[0]*cos -         1./fParams[0]*sin;
  Double_t y0 =          1./fParams[0]*cos - fParams[1]/fParams[0]*sin;
  if ((-fParams[2]*fParams[0]+fParams[1]*fParams[1]+1) <= 0) return kFALSE;
  Double_t r  = TMath::Sqrt(-fParams[2]*fParams[0]+fParams[1]*fParams[1]+1)/
                fParams[0];

  // Define space-point refence plane
  Double_t alphap = p.GetAngle();
  Double_t sinp = TMath::Sin(alphap);
  Double_t cosp = TMath::Cos(alphap);
  Double_t x  = p.GetX()*cosp + p.GetY()*sinp;
  Double_t y  = p.GetY()*cosp - p.GetX()*sinp;
  Double_t x0p= x0*cosp + y0*sinp;
  Double_t y0p= y0*cosp - x0*sinp;
  if ((r*r - (x-x0p)*(x-x0p))<0) {
    AliWarning(Form("Track extrapolation failed ! (Track radius = %f, track circle x = %f, space-point x = %f, reference plane angle = %f\n",r,x0p,x,alphap));
    return kFALSE;
  }
  Double_t temp = TMath::Sqrt(r*r - (x-x0p)*(x-x0p));
  Double_t y1 = y0p + temp;
  Double_t y2 = y0p - temp;
  Double_t yprime = y1;
  if(TMath::Abs(y2-y) < TMath::Abs(y1-y)) yprime = y2;

  // Back to the global coordinate system
  Double_t xsecond = x*cosp - yprime*sinp;
  Double_t ysecond = yprime*cosp + x*sinp;

  // Now Z coordinate and track angles
  Double_t x2 = xsecond*cos + ysecond*sin;
  Double_t zsecond = GetZat(x2);
  Double_t dydx = GetDYat(x2);
  Double_t dzdx = GetDZat(x2);

  // Fill the cov matrix of the track extrapolation point
  Double_t cov[6] = {0,0,0,0,0,0};
  Double_t sigmax = 100*100.;
  cov[0] = sigmax;           cov[1] = sigmax*dydx;      cov[2] = sigmax*dzdx;
  cov[3] = sigmax*dydx*dydx; cov[4] = sigmax*dydx*dzdx;
  cov[5] = sigmax*dzdx*dzdx;

  Float_t  newcov[6];
  newcov[0] = cov[0]*cos*cos-
            2*cov[1]*sin*cos+
              cov[3]*sin*sin;
  newcov[1] = cov[1]*(cos*cos-sin*sin)-
             (cov[3]-cov[0])*sin*cos;
  newcov[2] = cov[2]*cos-
              cov[4]*sin;
  newcov[3] = cov[0]*sin*sin+
            2*cov[1]*sin*cos+
              cov[3]*cos*cos;
  newcov[4] = cov[4]*cos+
              cov[2]*sin;
  newcov[5] = cov[5];

  p2.SetXYZ(xsecond,ysecond,zsecond,newcov);
  if (AliLog::GetDebugLevel("","AliTrackFitterRieman")>1){
    AliTrackPoint lp0(p);
    AliTrackPoint lp2(p2);
    if (0)(*fDebugStream)<<"PCA"<<
      "P0.="<<&lp0<<
      "P2.="<<&lp2<<
      "\n";
  }
  return kTRUE;
}
Commit	Line	Data
6b6cba33	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, 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	/* $Id$ */
	17
	18	///////////////////////////////////////////////////////////////////////////////
	19	//
	20	// Class to the track points on the Riemann sphere. Inputs are
	21	// the set of id's (volids) of the volumes in which residuals are
	22	// calculated to construct a chi2 function to be minimized during
	23	// the alignment procedures. For the moment the track extrapolation is
	24	// taken at the space-point reference plane. The reference plane is
	25	// found using the covariance matrix of the point
	26	// (assuming sigma(x)=0 at the reference coordinate system.
	27	//
8849da04	28	// Internal usage of AliRieman class for minimization
8849da04	29	//
6b6cba33	30	//////////////////////////////////////////////////////////////////////////////
6b6cba33	31
98937d93	32	#include "TMatrixDSym.h"
98937d93	33	#include "TMatrixD.h"
8849da04	34	#include "TArrayI.h"
98937d93	35	#include "AliTrackFitterRieman.h"
24d4520d	36	#include "AliLog.h"
8849da04	37	#include "TTreeStream.h"
	38	#include "AliRieman.h"
	39	#include "AliLog.h"
98937d93	40
	41	ClassImp(AliTrackFitterRieman)
	42
8849da04	43
98937d93	44	AliTrackFitterRieman::AliTrackFitterRieman():
	45	AliTrackFitter()
	46	{
	47	//
	48	// default constructor
	49	//
	50	fAlpha = 0.;
46ae650f	51	fNUsed = 0;
98937d93	52	fConv = kFALSE;
186e6ced	53	fMaxDelta = 3;
8849da04	54	fDebugStream = new TTreeSRedirector("RiemanAlignDebug.root");
8849da04	55	fRieman = new AliRieman(10000); // allocate rieman
98937d93	56	}
	57
	58
	59	AliTrackFitterRieman::AliTrackFitterRieman(AliTrackPointArray *array, Bool_t owner):
	60	AliTrackFitter(array,owner)
	61	{
	62	//
	63	// Constructor
	64	//
	65	fAlpha = 0.;
46ae650f	66	fNUsed = 0;
98937d93	67	fConv = kFALSE;
186e6ced	68	fMaxDelta = 3;
8849da04	69	if (AliLog::GetDebugLevel("","AliTrackFitterRieman")) fDebugStream = new TTreeSRedirector("RiemanAlignDebug.root");
8849da04	70	fRieman = new AliRieman(10000); //allocate rieman
98937d93	71	}
	72
	73	AliTrackFitterRieman::AliTrackFitterRieman(const AliTrackFitterRieman &rieman):
	74	AliTrackFitter(rieman)
	75	{
	76	//
	77	// copy constructor
	78	//
	79	fAlpha = rieman.fAlpha;
46ae650f	80	fNUsed = rieman.fNUsed;
98937d93	81	fConv = rieman.fConv;
186e6ced	82	fMaxDelta = rieman.fMaxDelta;
8849da04	83	fRieman = new AliRieman(*(rieman.fRieman));
98937d93	84	}
	85
	86	//_____________________________________________________________________________
	87	AliTrackFitterRieman &AliTrackFitterRieman::operator =(const AliTrackFitterRieman& rieman)
	88	{
6b6cba33	89	//
6b6cba33	90	// Assignment operator
98937d93	91	//
	92	if(this==&rieman) return *this;
	93	((AliTrackFitter *)this)->operator=(rieman);
	94
8849da04	95	fAlpha = rieman.fAlpha;
	96	fNUsed = rieman.fNUsed;
	97	fConv = rieman.fConv;
186e6ced	98	fMaxDelta = rieman.fMaxDelta;
8849da04	99	fRieman = new AliRieman(*(rieman.fRieman));
98937d93	100	return *this;
	101	}
	102
8849da04	103
	104	AliTrackFitterRieman::~AliTrackFitterRieman(){
	105	//
	106	//
	107	//
	108	delete fRieman;
	109	delete fDebugStream;
	110	}
	111
98937d93	112	void AliTrackFitterRieman::Reset()
	113	{
	114	// Reset the track parameters and
	115	// rieman sums
6b6cba33	116	//
98937d93	117	AliTrackFitter::Reset();
8849da04	118	fRieman->Reset();
98937d93	119	fAlpha = 0.;
46ae650f	120	fNUsed = 0;
98937d93	121	fConv =kFALSE;
	122	}
	123
cc345ce3	124	Bool_t AliTrackFitterRieman::Fit(const TArrayI volIds,const TArrayI volIdsFit,
98937d93	125	AliAlignObj::ELayerID layerRangeMin,
8849da04	126	AliAlignObj::ELayerID layerRangeMax)
98937d93	127	{
98937d93	128	// Fit the track points. The method takes as an input
cc345ce3	129	// the set of id's (volids) of the volumes in which
	130	// one wants to calculate the residuals.
	131	// The following parameters are used to define the
98937d93	132	// range of volumes to be used in the fitting
	133	// As a result two AliTrackPointArray's obects are filled.
	134	// The first one contains the space points with
cc345ce3	135	// volume id's from volids list. The second array of points represents
cc345ce3	136	// the track extrapolations corresponding to the space points
98937d93	137	// in the first array. The two arrays can be used to find
cc345ce3	138	// the residuals in the volids and consequently construct a
98937d93	139	// chi2 function to be minimized during the alignment
98937d93	140	// procedures. For the moment the track extrapolation is taken
cc345ce3	141	// at the space-point reference plane. The reference plane is
	142	// found using the covariance matrix of the point
	143	// (assuming sigma(x)=0 at the reference coordinate system.
98937d93	144
46ae650f	145	Reset();
98937d93	146	Int_t npoints = fPoints->GetNPoints();
8849da04	147	if (fPoints && AliLog::GetDebugLevel("","AliTrackFitterRieman")>1){
	148	Int_t nVol = volIds->GetSize();
	149	Int_t nVolFit = volIdsFit->GetSize();
	150	Int_t volId = volIds->At(0);
	151	(*fDebugStream)<<"PInput"<<
	152	"NPoints="<<npoints<< // number of points
	153	"VolId="<<volId<< // first vol ID
	154	"NVol="<<nVol<< // number of volumes
	155	"NvolFit="<<nVolFit<< // number of volumes to fit
	156	"fPoints.="<<fPoints<< // input points
	157	"\n";
	158	}
98937d93	159	if (npoints < 3) return kFALSE;
98937d93	160
cc345ce3	161	Bool_t isAlphaCalc = kFALSE;
46ae650f	162	AliTrackPoint p,plocal;
cc345ce3	163	// fPoints->GetPoint(p,0);
cc345ce3	164	// fAlpha = TMath::ATan2(p.GetY(),p.GetX());
98937d93	165
98937d93	166	Int_t npVolId = 0;
46ae650f	167	fNUsed = 0;
98937d93	168	Int_t *pindex = new Int_t[npoints];
	169	for (Int_t ipoint = 0; ipoint < npoints; ipoint++)
	170	{
	171	fPoints->GetPoint(p,ipoint);
	172	UShort_t iVolId = p.GetVolumeID();
cc345ce3	173	if (FindVolId(volIds,iVolId)) {
98937d93	174	pindex[npVolId] = ipoint;
	175	npVolId++;
	176	}
cc345ce3	177	if (volIdsFit != 0x0) {
cc345ce3	178	if (!FindVolId(volIdsFit,iVolId)) continue;
46ae650f	179	}
	180	else {
	181	if (iVolId < AliAlignObj::LayerToVolUID(layerRangeMin,0) \|\|
	182	iVolId > AliAlignObj::LayerToVolUID(layerRangeMax,
c041444f	183	AliAlignObj::LayerSize(layerRangeMax))) continue;
46ae650f	184	}
cc345ce3	185	if (!isAlphaCalc) {
	186	fAlpha = p.GetAngle();
	187	isAlphaCalc = kTRUE;
	188	}
46ae650f	189	plocal = p.Rotate(fAlpha);
186e6ced	190	if (TMath::Abs(plocal.GetX())>500 \|\| TMath::Abs(plocal.GetX())<2 \|\| plocal.GetCov()[3]<=0 \|\|plocal.GetCov()[5]<=0 ){
8849da04	191	printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<</n");
	192	p.Dump();
	193	plocal.Dump();
	194	printf("Problematic point\n");
	195	printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<</n");
186e6ced	196	}else{
	197	AddPoint(plocal.GetX(),plocal.GetY(),plocal.GetZ(),
	198	TMath::Sqrt(plocal.GetCov()[3]),TMath::Sqrt(plocal.GetCov()[5]));
8849da04	199	}
8849da04	200	// fNUsed++; AddPoint should be responsible
98937d93	201	}
98937d93	202
8849da04	203	if (npVolId == 0 \|\| fNUsed < fMinNPoints) {
98937d93	204	delete [] pindex;
	205	return kFALSE;
	206	}
	207
	208	Update();
cc345ce3	209
98937d93	210	if (!fConv) {
	211	delete [] pindex;
	212	return kFALSE;
	213	}
	214
	215	if ((fParams[0] == 0) \|\|
	216	((-fParams[2]fParams[0]+fParams[1]fParams[1]+1) <= 0)) {
	217	delete [] pindex;
	218	return kFALSE;
	219	}
	220
cc345ce3	221
	222	if (fNUsed < fMinNPoints) {
	223	delete [] pindex;
	224	return kFALSE;
	225	}
	226
46ae650f	227	fPVolId = new AliTrackPointArray(npVolId);
46ae650f	228	fPTrack = new AliTrackPointArray(npVolId);
98937d93	229	AliTrackPoint p2;
	230	for (Int_t ipoint = 0; ipoint < npVolId; ipoint++)
	231	{
	232	Int_t index = pindex[ipoint];
	233	fPoints->GetPoint(p,index);
186e6ced	234	if (GetPCA(p,p2) && (
	235	TMath::Abs(p.GetX()-p2.GetX())<fMaxDelta &&
	236	TMath::Abs(p.GetY()-p2.GetY())<fMaxDelta &&
	237	TMath::Abs(p.GetZ()-p2.GetZ())<fMaxDelta
	238	)) {
cc345ce3	239	Float_t xyz[3],xyz2[3];
cc345ce3	240	p.GetXYZ(xyz); p2.GetXYZ(xyz2);
186e6ced	241	// printf("residuals %f %d %d %f %f %f %f %f %f\n",fChi2,fNUsed,fConv,xyz[0],xyz[1],xyz[2],xyz2[0]-xyz[0],xyz2[1]-xyz[1],xyz2[2]-xyz[2]);
46ae650f	242	fPVolId->AddPoint(ipoint,&p);
46ae650f	243	fPTrack->AddPoint(ipoint,&p2);
8849da04	244	}else{
	245	// what should be default bahavior -
	246	delete [] pindex;
	247	delete fPVolId;
	248	delete fPTrack;
	249	fPVolId =0;
	250	fPTrack =0;
	251	return kFALSE;
98937d93	252	}
98937d93	253	}
8849da04	254
	255	if (AliLog::GetDebugLevel("","AliTrackFitterRieman")>0){
	256	//
	257	// Debug Info
	258	//
	259	AliTrackPointArray *lPVolId = new AliTrackPointArray(npVolId);
	260	AliTrackPointArray *lPTrack = new AliTrackPointArray(npVolId);
	261	AliRieman * residual = fRieman->MakeResiduals();
	262	AliTrackPoint p2local;
	263	for (Int_t ipoint = 0; ipoint < npVolId; ipoint++){
	264	Int_t index = pindex[ipoint];
	265	fPoints->GetPoint(p,index);
	266	if (GetPCA(p,p2)) {
	267	plocal = p.Rotate(fAlpha);
	268	// plocal.Rotate(fAlpha);
	269	Float_t xyz[3],xyz2[3];
	270	p2local = plocal;
	271	plocal.GetXYZ(xyz);
	272	xyz2[0] = xyz[0];
	273	xyz2[1] = GetYat(xyz[0]);
	274	xyz2[2] = GetZat(xyz[0]);
	275	p2local.SetXYZ(xyz2);
	276	lPVolId->AddPoint(ipoint,&plocal);
	277	lPTrack->AddPoint(ipoint,&p2local);
	278	}
	279	}
	280	//
	281	// debug info
	282	//
	283	Int_t nVol = volIds->GetSize();
	284	Int_t nVolFit = volIdsFit->GetSize();
	285	Int_t volId = volIds->At(0);
	286	Int_t modId =0;
	287	Int_t layer = AliAlignObj::VolUIDToLayer(volId,modId);
	288
	289	(*fDebugStream)<<"Fit"<<
	290	"VolId="<<volId<< // volume ID
	291	"Layer="<<layer<< // layer ID
	292	"Module="<<modId<< // module ID
	293	"NVol="<<nVol<< // number of volumes
	294	"NvolFit="<<nVolFit<< // number of volumes to fit
	295	"Points0.="<<fPVolId<< // original points
	296	"Points1.="<<fPTrack<< // fitted points
	297	"LPoints0.="<<lPVolId<< // original points - local frame
	298	"LPoints1.="<<lPTrack<< // fitted points - local frame
	299	"Rieman.="<<this<< // original rieman fit
	300	"Res.="<<residual<< // residuals of rieman fit
	301	"\n";
	302	delete lPVolId;
	303	delete lPTrack;
	304	delete residual;
	305	}
98937d93	306
98937d93	307	delete [] pindex;
98937d93	308	return kTRUE;
	309	}
	310
8849da04	311
98937d93	312	void AliTrackFitterRieman::AddPoint(Float_t x, Float_t y, Float_t z, Float_t sy, Float_t sz)
	313	{
	314	//
8849da04	315	// add point to rieman fitter
98937d93	316	//
8849da04	317	fRieman->AddPoint(x,y,z,sy,sz);
8849da04	318	fNUsed = fRieman->GetN();
98937d93	319	}
98937d93	320
8849da04	321
8849da04	322
98937d93	323	void AliTrackFitterRieman::Update(){
98937d93	324	//
8849da04	325	//
98937d93	326	//
8849da04	327	fRieman->Update();
	328	fConv = kFALSE;
	329	if (fRieman->IsValid()){
	330	for (Int_t ipar=0; ipar<6; ipar++){
	331	fParams[ipar] = fRieman->GetParam()[ipar];
98937d93	332	}
8849da04	333	fChi2 = fRieman->GetChi2();
	334	fNdf = fRieman->GetN()- 2;
	335	fNUsed = fRieman->GetN();
	336	fConv = kTRUE;
98937d93	337	}
98937d93	338	}
98937d93	339
6b6cba33	340	//_____________________________________________________________________________
98937d93	341	Bool_t AliTrackFitterRieman::GetPCA(const AliTrackPoint &p, AliTrackPoint &p2) const
98937d93	342	{
6b6cba33	343	//
98937d93	344	// Get the closest to a given spacepoint track trajectory point
98937d93	345	// Look for details in the description of the Fit() method
6b6cba33	346	//
98937d93	347	if (!fConv) return kFALSE;
	348
	349	// First X and Y coordinates
	350	Double_t sin = TMath::Sin(fAlpha);
	351	Double_t cos = TMath::Cos(fAlpha);
	352	// fParam[0] = 1/y0
	353	// fParam[1] = -x0/y0
	354	// fParam[2] = - (R^2 - x0^2 - y0^2)/y0
	355	if (fParams[0] == 0) return kFALSE;
cc345ce3	356	// Track parameters in the global coordinate system
98937d93	357	Double_t x0 = -fParams[1]/fParams[0]cos - 1./fParams[0]sin;
	358	Double_t y0 = 1./fParams[0]cos - fParams[1]/fParams[0]sin;
	359	if ((-fParams[2]fParams[0]+fParams[1]fParams[1]+1) <= 0) return kFALSE;
6b6cba33	360	Double_t r = TMath::Sqrt(-fParams[2]fParams[0]+fParams[1]fParams[1]+1)/
98937d93	361	fParams[0];
98937d93	362
cc345ce3	363	// Define space-point refence plane
	364	Double_t alphap = p.GetAngle();
	365	Double_t sinp = TMath::Sin(alphap);
	366	Double_t cosp = TMath::Cos(alphap);
	367	Double_t x = p.GetX()cosp + p.GetY()sinp;
	368	Double_t y = p.GetY()cosp - p.GetX()sinp;
	369	Double_t x0p= x0cosp + y0sinp;
	370	Double_t y0p= y0cosp - x0sinp;
6b6cba33	371	if ((rr - (x-x0p)(x-x0p))<0) {
6b6cba33	372	AliWarning(Form("Track extrapolation failed ! (Track radius = %f, track circle x = %f, space-point x = %f, reference plane angle = %f\n",r,x0p,x,alphap));
24d4520d	373	return kFALSE;
24d4520d	374	}
6b6cba33	375	Double_t temp = TMath::Sqrt(rr - (x-x0p)(x-x0p));
cc345ce3	376	Double_t y1 = y0p + temp;
	377	Double_t y2 = y0p - temp;
	378	Double_t yprime = y1;
	379	if(TMath::Abs(y2-y) < TMath::Abs(y1-y)) yprime = y2;
	380
	381	// Back to the global coordinate system
	382	Double_t xsecond = xcosp - yprimesinp;
	383	Double_t ysecond = yprimecosp + xsinp;
	384
	385	// Now Z coordinate and track angles
	386	Double_t x2 = xsecondcos + ysecondsin;
	387	Double_t zsecond = GetZat(x2);
	388	Double_t dydx = GetDYat(x2);
	389	Double_t dzdx = GetDZat(x2);
	390
	391	// Fill the cov matrix of the track extrapolation point
	392	Double_t cov[6] = {0,0,0,0,0,0};
	393	Double_t sigmax = 100*100.;
	394	cov[0] = sigmax; cov[1] = sigmaxdydx; cov[2] = sigmaxdzdx;
	395	cov[3] = sigmaxdydxdydx; cov[4] = sigmaxdydxdzdx;
	396	cov[5] = sigmaxdzdxdzdx;
	397
	398	Float_t newcov[6];
	399	newcov[0] = cov[0]coscos-
	400	2cov[1]sin*cos+
	401	cov[3]sinsin;
	402	newcov[1] = cov[1](coscos-sin*sin)-
	403	(cov[3]-cov[0])sincos;
	404	newcov[2] = cov[2]*cos-
	405	cov[4]*sin;
	406	newcov[3] = cov[0]sinsin+
	407	2cov[1]sin*cos+
	408	cov[3]coscos;
	409	newcov[4] = cov[4]*cos+
	410	cov[2]*sin;
	411	newcov[5] = cov[5];
	412
	413	p2.SetXYZ(xsecond,ysecond,zsecond,newcov);
8849da04	414	if (AliLog::GetDebugLevel("","AliTrackFitterRieman")>1){
	415	AliTrackPoint lp0(p);
	416	AliTrackPoint lp2(p2);
	417	if (0)(*fDebugStream)<<"PCA"<<
	418	"P0.="<<&lp0<<
	419	"P2.="<<&lp2<<
	420	"\n";
	421	}
98937d93	422	return kTRUE;
98937d93	423	}