[u/mrichter/AliRoot.git] / TPC / AliTPCTransform.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.                  *
 **************************************************************************/

//-------------------------------------------------------
//          Implementation of the TPC transformation class
//
//   Origin: Marian Ivanov   Marian.Ivanov@cern.ch
//           Magnus Mager
//
//   Class for tranformation of the coordinate frame
//   Transformation  
//    local coordinate frame (sector, padrow, pad, timebine) ==>
//    rotated global (tracking) cooridnate frame (sector, lx,ly,lz)
//
//    Unisochronity  - (substract time0 - pad by pad)
//    Drift velocity - Currently common drift velocity - functionality of AliTPCParam
//    ExB effect     - 
//
//    Time of flight correction -
//                   - Depends on the vertex position
//                   - by default 
//                           
//    Usage:
//          AliTPCclustererMI::AddCluster
//          AliTPCtrackerMI::Transform
//    
//-------------------------------------------------------

/* To test it:
   cdb=AliCDBManager::Instance()
   cdb->SetDefaultStorage("local:///u/mmager/mycalib1")
   c=AliTPCcalibDB::Instance()
   c->SetRun(0)
   Double_t x[]={1.0,2.0,3.0}
   Int_t i[]={4}
   AliTPCTransform trafo
   trafo.Transform(x,i,0,1)
 */

/* $Id$ */

#include "AliTPCROC.h"
#include "AliTPCCalPad.h"
#include "AliTPCCalROC.h"
#include "AliTPCcalibDB.h"
#include "AliTPCParam.h"
#include "TMath.h"
#include "AliLog.h"
#include "AliTPCExB.h"
#include "TGeoMatrix.h"
#include "AliTPCRecoParam.h"
#include "AliTPCCalibVdrift.h"
#include "AliTPCTransform.h"

ClassImp(AliTPCTransform)


AliTPCTransform::AliTPCTransform():
  AliTransform(),
  fCurrentRecoParam(0),       //! current reconstruction parameters
  fCurrentRun(0),             //! current run
  fCurrentTimeStamp(0)        //! current time stamp   
{
  //
  // Speed it up a bit!
  //
  for (Int_t i=0;i<18;++i) {
    Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18));
    fSins[i]=TMath::Sin(alpha);
    fCoss[i]=TMath::Cos(alpha);
  }
  fPrimVtx[0]=0;
  fPrimVtx[1]=0;
  fPrimVtx[2]=0;
}
AliTPCTransform::AliTPCTransform(const AliTPCTransform& transform):
  AliTransform(transform),
  fCurrentRecoParam(transform.fCurrentRecoParam),       //! current reconstruction parameters
  fCurrentRun(transform.fCurrentRun),             //! current run
  fCurrentTimeStamp(transform.fCurrentTimeStamp)        //! current time stamp   
{
  //
  // Speed it up a bit!
  //
  for (Int_t i=0;i<18;++i) {
    Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18));
    fSins[i]=TMath::Sin(alpha);
    fCoss[i]=TMath::Cos(alpha);
  }
  fPrimVtx[0]=0;
  fPrimVtx[1]=0;
  fPrimVtx[2]=0;
}

AliTPCTransform::~AliTPCTransform() {
  //
  // Destructor
  //
}

void AliTPCTransform::SetPrimVertex(Double_t *vtx){
  //
  //
  //
  fPrimVtx[0]=vtx[0];
  fPrimVtx[1]=vtx[1];
  fPrimVtx[2]=vtx[2];
}


void AliTPCTransform::Transform(Double_t *x,Int_t *i,UInt_t /*time*/,
				Int_t /*coordinateType*/) {
  // input: x[0] - pad row
  //        x[1] - pad 
  //        x[2] - time in us
  //        i[0] - sector
  // output: x[0] - x (all in the rotated global coordinate frame)
  //         x[1] - y
  //         x[2] - z
  //
  //  primvtx     - position of the primary vertex
  //                used for the TOF correction
  //                TOF of particle calculated assuming the speed-of-light and 
  //                line approximation  
  //
  
  Int_t row=TMath::Nint(x[0]);
  Int_t pad=TMath::Nint(x[1]);
  Int_t sector=i[0];
  AliTPCcalibDB*  calib=AliTPCcalibDB::Instance();  
  //
  AliTPCCalPad * time0TPC = calib->GetPadTime0(); 
  AliTPCParam  * param    = calib->GetParameters(); 
  if (!time0TPC){
    AliFatal("Time unisochronity missing");
  }

  if (!param){
    AliFatal("Parameters missing");
  }

  Double_t xx[3];
  //  Apply Time0 correction - Pad by pad fluctuation
  //
  x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad);
  //
  // Tranform from pad - time coordinate system to the rotated global (tracking) system
  //
  Local2RotatedGlobal(sector,x);
  //
  //
  //
  // Alignment
  //TODO:  calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx);
  RotatedGlobal2Global(sector,x);
  //
  //
  // ExB correction
  //
  if(fCurrentRecoParam&&fCurrentRecoParam->GetUseExBCorrection()) {

    calib->GetExB()->Correct(x,xx);

  } else {

    xx[0] = x[0];
    xx[1] = x[1];
    xx[2] = x[2];
  }

  //
  // Time of flight correction
  // 
  if (fCurrentRecoParam&&fCurrentRecoParam->GetUseTOFCorrection()){
    const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector(); 
    Float_t sign=1;
    if (sector < kNIS) {
      sign = (sector < kNIS/2) ? 1 : -1;
    } else {
      sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
    }
    Float_t deltaDr =0;
    Float_t dist=0;
    dist+=(fPrimVtx[0]-x[0])*(fPrimVtx[0]-x[0]);
    dist+=(fPrimVtx[1]-x[1])*(fPrimVtx[1]-x[1]);
    dist+=(fPrimVtx[2]-x[2])*(fPrimVtx[2]-x[2]);
    dist = TMath::Sqrt(dist);
    // drift length correction because of TOF
    // the drift velocity is in cm/s therefore multiplication by 0.01
    deltaDr = (dist*(0.01*param->GetDriftV()))/TMath::C(); 
    xx[2]+=sign*deltaDr;
  }
  //
  //
  //

  //
  Global2RotatedGlobal(sector,xx);
  //
  x[0]=xx[0];x[1]=xx[1];x[2]=xx[2];
}

void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const {
  //
  //  
  // Tranform coordinate from  
  // row, pad, time to x,y,z
  //
  // Drift Velocity 
  // Current implementation - common drift velocity - for full chamber
  // TODO: use a map or parametrisation!
  //
  //  
  //
  const  Int_t kMax =60;  // cache for 60 seconds
  static Int_t lastStamp=-1;  //cached values
  static Double_t lastCorr = 1;
  //
  AliTPCcalibDB*  calib=AliTPCcalibDB::Instance();
  AliTPCParam  * param    = calib->GetParameters(); 
  AliTPCCalibVdrift *driftCalib = AliTPCcalibDB::Instance()->GetVdrift(fCurrentRun);
  Double_t driftCorr = 1.;
  if (driftCalib){
    //
    // caching drift correction - temp. fix
    // Extremally slow procedure
    if ( TMath::Abs((lastStamp)-Int_t(fCurrentTimeStamp))<kMax){
      driftCorr = lastCorr;
    }else{
      driftCorr = 1.+(driftCalib->GetPTRelative(fCurrentTimeStamp,0)+ driftCalib->GetPTRelative(fCurrentTimeStamp,1))*0.5;
      lastCorr=driftCorr;
      lastStamp=fCurrentTimeStamp;
      
    }
  }
  //
  // simple caching non thread save
  static Double_t vdcorrectionTime=1;
  static Double_t time0corrTime=0;
  static Int_t    lastStampT=-1;
  //
  if (lastStampT!=(Int_t)fCurrentTimeStamp){
    lastStampT=fCurrentTimeStamp;
    if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionTime()>0) {
      vdcorrectionTime = (1+AliTPCcalibDB::Instance()->
			  GetVDriftCorrectionTime(fCurrentTimeStamp, 
						  AliTPCcalibDB::Instance()->GetRun(),
						  sector%36>=18,
						  fCurrentRecoParam->GetUseDriftCorrectionTime()));			  
      time0corrTime= AliTPCcalibDB::Instance()->
	GetTime0CorrectionTime(fCurrentTimeStamp, 
			       AliTPCcalibDB::Instance()->GetRun(),
			       sector%36>=18,
			       fCurrentRecoParam->GetUseDriftCorrectionTime());	
    }
    //
    if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionGY()>0) {
      Float_t xyzPad[3];
      AliTPCROC::Instance()->GetPositionGlobal(sector, TMath::Nint(x[0]) ,TMath::Nint(x[1]), xyzPad);
      
      Double_t corrGy= (1+(xyzPad[1])*AliTPCcalibDB::Instance()->
			GetVDriftCorrectionGy(fCurrentTimeStamp, 
					      AliTPCcalibDB::Instance()->GetRun(),
					      sector%36>=18,
					      fCurrentRecoParam->GetUseDriftCorrectionGY()));
      vdcorrectionTime *=corrGy;
    }
  }


  if (!param){
    AliFatal("Parameters missing");
  }
  Int_t row=TMath::Nint(x[0]);
  //  Int_t pad=TMath::Nint(x[1]);
  //
  const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
  Double_t sign = 1.;
  Double_t zwidth    = param->GetZWidth()*driftCorr*vdcorrectionTime;
  Double_t padWidth  = 0;
  Double_t padLength = 0;
  Double_t    maxPad    = 0;
  //
  if (sector < kNIS) {
    maxPad = param->GetNPadsLow(row);
    sign = (sector < kNIS/2) ? 1 : -1;
    padLength = param->GetPadPitchLength(sector,row);
    padWidth = param->GetPadPitchWidth(sector);
  } else {
    maxPad = param->GetNPadsUp(row);
    sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
    padLength = param->GetPadPitchLength(sector,row);
    padWidth  = param->GetPadPitchWidth(sector);
  }
  //
  // X coordinate
  x[0] = param->GetPadRowRadii(sector,row);  // padrow X position - ideal
  //
  // Y coordinate
  //
  x[1]=(x[1]-0.5*maxPad)*padWidth;
  // pads are mirrorred on C-side
  if (sector%36>17){
    x[1]*=-1;
  }
  
  //
  
  //
  // Z coordinate
  //
  x[2]*= zwidth;  // tranform time bin to the distance to the ROC
  x[2]-= 3.*param->GetZSigma() + param->GetNTBinsL1()*zwidth+ time0corrTime;
  // subtract the time offsets
  x[2] = sign*( param->GetZLength(sector) - x[2]);
}

void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const {
  //
  // transform possition rotated global to the global
  //
  Double_t cos,sin;
  GetCosAndSin(sector,cos,sin);
  Double_t tmp=x[0];
  x[0]= cos*tmp-sin*x[1];
  x[1]=+sin*tmp+cos*x[1];
}

void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const {
  //
  // tranform possition Global2RotatedGlobal
  //
  Double_t cos,sin;
  GetCosAndSin(sector,cos,sin);
  Double_t tmp=x[0];
  x[0]= cos*tmp+sin*x[1];
  x[1]= -sin*tmp+cos*x[1];
}

void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos,
					  Double_t &sin) const {
  cos=fCoss[sector%18];
  sin=fSins[sector%18];
}


void AliTPCTransform::ApplyTransformations(Double_t */*xyz*/, Int_t /*volID*/){
  //
  // Modify global position
  // xyz    - global xyz position
  // volID  - volID of detector (sector number)
  //
  //
  
}
Commit	Line	Data
	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	//-------------------------------------------------------
	17	// Implementation of the TPC transformation class
	18	//
	19	// Origin: Marian Ivanov Marian.Ivanov@cern.ch
	20	// Magnus Mager
	21	//
	22	// Class for tranformation of the coordinate frame
	23	// Transformation
	24	// local coordinate frame (sector, padrow, pad, timebine) ==>
	25	// rotated global (tracking) cooridnate frame (sector, lx,ly,lz)
	26	//
	27	// Unisochronity - (substract time0 - pad by pad)
	28	// Drift velocity - Currently common drift velocity - functionality of AliTPCParam
	29	// ExB effect -
	30	//
	31	// Time of flight correction -
	32	// - Depends on the vertex position
	33	// - by default
	34	//
	35	// Usage:
	36	// AliTPCclustererMI::AddCluster
	37	// AliTPCtrackerMI::Transform
	38	//
	39	//-------------------------------------------------------
	40
	41	/* To test it:
	42	cdb=AliCDBManager::Instance()
	43	cdb->SetDefaultStorage("local:///u/mmager/mycalib1")
	44	c=AliTPCcalibDB::Instance()
	45	c->SetRun(0)
	46	Double_t x[]={1.0,2.0,3.0}
	47	Int_t i[]={4}
	48	AliTPCTransform trafo
	49	trafo.Transform(x,i,0,1)
	50	*/
	51
	52	/* $Id$ */
	53
	54	#include "AliTPCROC.h"
	55	#include "AliTPCCalPad.h"
	56	#include "AliTPCCalROC.h"
	57	#include "AliTPCcalibDB.h"
	58	#include "AliTPCParam.h"
	59	#include "TMath.h"
	60	#include "AliLog.h"
	61	#include "AliTPCExB.h"
	62	#include "TGeoMatrix.h"
	63	#include "AliTPCRecoParam.h"
	64	#include "AliTPCCalibVdrift.h"
	65	#include "AliTPCTransform.h"
	66
	67	ClassImp(AliTPCTransform)
	68
	69
	70	AliTPCTransform::AliTPCTransform():
	71	AliTransform(),
	72	fCurrentRecoParam(0), //! current reconstruction parameters
	73	fCurrentRun(0), //! current run
	74	fCurrentTimeStamp(0) //! current time stamp
	75	{
	76	//
	77	// Speed it up a bit!
	78	//
	79	for (Int_t i=0;i<18;++i) {
	80	Double_t alpha=TMath::DegToRad()(10.+20.(i%18));
	81	fSins[i]=TMath::Sin(alpha);
	82	fCoss[i]=TMath::Cos(alpha);
	83	}
	84	fPrimVtx[0]=0;
	85	fPrimVtx[1]=0;
	86	fPrimVtx[2]=0;
	87	}
	88	AliTPCTransform::AliTPCTransform(const AliTPCTransform& transform):
	89	AliTransform(transform),
	90	fCurrentRecoParam(transform.fCurrentRecoParam), //! current reconstruction parameters
	91	fCurrentRun(transform.fCurrentRun), //! current run
	92	fCurrentTimeStamp(transform.fCurrentTimeStamp) //! current time stamp
	93	{
	94	//
	95	// Speed it up a bit!
	96	//
	97	for (Int_t i=0;i<18;++i) {
	98	Double_t alpha=TMath::DegToRad()(10.+20.(i%18));
	99	fSins[i]=TMath::Sin(alpha);
	100	fCoss[i]=TMath::Cos(alpha);
	101	}
	102	fPrimVtx[0]=0;
	103	fPrimVtx[1]=0;
	104	fPrimVtx[2]=0;
	105	}
	106
	107	AliTPCTransform::~AliTPCTransform() {
	108	//
	109	// Destructor
	110	//
	111	}
	112
	113	void AliTPCTransform::SetPrimVertex(Double_t *vtx){
	114	//
	115	//
	116	//
	117	fPrimVtx[0]=vtx[0];
	118	fPrimVtx[1]=vtx[1];
	119	fPrimVtx[2]=vtx[2];
	120	}
	121
	122
	123	void AliTPCTransform::Transform(Double_t x,Int_t i,UInt_t /time/,
	124	Int_t /coordinateType/) {
	125	// input: x[0] - pad row
	126	// x[1] - pad
	127	// x[2] - time in us
	128	// i[0] - sector
	129	// output: x[0] - x (all in the rotated global coordinate frame)
	130	// x[1] - y
	131	// x[2] - z
	132	//
	133	// primvtx - position of the primary vertex
	134	// used for the TOF correction
	135	// TOF of particle calculated assuming the speed-of-light and
	136	// line approximation
	137	//
	138
	139	Int_t row=TMath::Nint(x[0]);
	140	Int_t pad=TMath::Nint(x[1]);
	141	Int_t sector=i[0];
	142	AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
	143	//
	144	AliTPCCalPad * time0TPC = calib->GetPadTime0();
	145	AliTPCParam * param = calib->GetParameters();
	146	if (!time0TPC){
	147	AliFatal("Time unisochronity missing");
	148	}
	149
	150	if (!param){
	151	AliFatal("Parameters missing");
	152	}
	153
	154	Double_t xx[3];
	155	// Apply Time0 correction - Pad by pad fluctuation
	156	//
	157	x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad);
	158	//
	159	// Tranform from pad - time coordinate system to the rotated global (tracking) system
	160	//
	161	Local2RotatedGlobal(sector,x);
	162	//
	163	//
	164	//
	165	// Alignment
	166	//TODO: calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx);
	167	RotatedGlobal2Global(sector,x);
	168	//
	169	//
	170	// ExB correction
	171	//
	172	if(fCurrentRecoParam&&fCurrentRecoParam->GetUseExBCorrection()) {
	173
	174	calib->GetExB()->Correct(x,xx);
	175
	176	} else {
	177
	178	xx[0] = x[0];
	179	xx[1] = x[1];
	180	xx[2] = x[2];
	181	}
	182
	183	//
	184	// Time of flight correction
	185	//
	186	if (fCurrentRecoParam&&fCurrentRecoParam->GetUseTOFCorrection()){
	187	const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
	188	Float_t sign=1;
	189	if (sector < kNIS) {
	190	sign = (sector < kNIS/2) ? 1 : -1;
	191	} else {
	192	sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
	193	}
	194	Float_t deltaDr =0;
	195	Float_t dist=0;
	196	dist+=(fPrimVtx[0]-x[0])*(fPrimVtx[0]-x[0]);
	197	dist+=(fPrimVtx[1]-x[1])*(fPrimVtx[1]-x[1]);
	198	dist+=(fPrimVtx[2]-x[2])*(fPrimVtx[2]-x[2]);
	199	dist = TMath::Sqrt(dist);
	200	// drift length correction because of TOF
	201	// the drift velocity is in cm/s therefore multiplication by 0.01
	202	deltaDr = (dist(0.01param->GetDriftV()))/TMath::C();
	203	xx[2]+=sign*deltaDr;
	204	}
	205	//
	206	//
	207	//
	208
	209	//
	210	Global2RotatedGlobal(sector,xx);
	211	//
	212	x[0]=xx[0];x[1]=xx[1];x[2]=xx[2];
	213	}
	214
	215	void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const {
	216	//
	217	//
	218	// Tranform coordinate from
	219	// row, pad, time to x,y,z
	220	//
	221	// Drift Velocity
	222	// Current implementation - common drift velocity - for full chamber
	223	// TODO: use a map or parametrisation!
	224	//
	225	//
	226	//
	227	const Int_t kMax =60; // cache for 60 seconds
	228	static Int_t lastStamp=-1; //cached values
	229	static Double_t lastCorr = 1;
	230	//
	231	AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
	232	AliTPCParam * param = calib->GetParameters();
	233	AliTPCCalibVdrift *driftCalib = AliTPCcalibDB::Instance()->GetVdrift(fCurrentRun);
	234	Double_t driftCorr = 1.;
	235	if (driftCalib){
	236	//
	237	// caching drift correction - temp. fix
	238	// Extremally slow procedure
	239	if ( TMath::Abs((lastStamp)-Int_t(fCurrentTimeStamp))<kMax){
	240	driftCorr = lastCorr;
	241	}else{
	242	driftCorr = 1.+(driftCalib->GetPTRelative(fCurrentTimeStamp,0)+ driftCalib->GetPTRelative(fCurrentTimeStamp,1))*0.5;
	243	lastCorr=driftCorr;
	244	lastStamp=fCurrentTimeStamp;
	245
	246	}
	247	}
	248	//
	249	// simple caching non thread save
	250	static Double_t vdcorrectionTime=1;
	251	static Double_t time0corrTime=0;
	252	static Int_t lastStampT=-1;
	253	//
	254	if (lastStampT!=(Int_t)fCurrentTimeStamp){
	255	lastStampT=fCurrentTimeStamp;
	256	if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionTime()>0) {
	257	vdcorrectionTime = (1+AliTPCcalibDB::Instance()->
	258	GetVDriftCorrectionTime(fCurrentTimeStamp,
	259	AliTPCcalibDB::Instance()->GetRun(),
	260	sector%36>=18,
	261	fCurrentRecoParam->GetUseDriftCorrectionTime()));
	262	time0corrTime= AliTPCcalibDB::Instance()->
	263	GetTime0CorrectionTime(fCurrentTimeStamp,
	264	AliTPCcalibDB::Instance()->GetRun(),
	265	sector%36>=18,
	266	fCurrentRecoParam->GetUseDriftCorrectionTime());
	267	}
	268	//
	269	if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionGY()>0) {
	270	Float_t xyzPad[3];
	271	AliTPCROC::Instance()->GetPositionGlobal(sector, TMath::Nint(x[0]) ,TMath::Nint(x[1]), xyzPad);
	272
	273	Double_t corrGy= (1+(xyzPad[1])*AliTPCcalibDB::Instance()->
	274	GetVDriftCorrectionGy(fCurrentTimeStamp,
	275	AliTPCcalibDB::Instance()->GetRun(),
	276	sector%36>=18,
	277	fCurrentRecoParam->GetUseDriftCorrectionGY()));
	278	vdcorrectionTime *=corrGy;
	279	}
	280	}
	281
	282
	283	if (!param){
	284	AliFatal("Parameters missing");
	285	}
	286	Int_t row=TMath::Nint(x[0]);
	287	// Int_t pad=TMath::Nint(x[1]);
	288	//
	289	const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
	290	Double_t sign = 1.;
	291	Double_t zwidth = param->GetZWidth()driftCorrvdcorrectionTime;
	292	Double_t padWidth = 0;
	293	Double_t padLength = 0;
	294	Double_t maxPad = 0;
	295	//
	296	if (sector < kNIS) {
	297	maxPad = param->GetNPadsLow(row);
	298	sign = (sector < kNIS/2) ? 1 : -1;
	299	padLength = param->GetPadPitchLength(sector,row);
	300	padWidth = param->GetPadPitchWidth(sector);
	301	} else {
	302	maxPad = param->GetNPadsUp(row);
	303	sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
	304	padLength = param->GetPadPitchLength(sector,row);
	305	padWidth = param->GetPadPitchWidth(sector);
	306	}
	307	//
	308	// X coordinate
	309	x[0] = param->GetPadRowRadii(sector,row); // padrow X position - ideal
	310	//
	311	// Y coordinate
	312	//
	313	x[1]=(x[1]-0.5maxPad)padWidth;
	314	// pads are mirrorred on C-side
	315	if (sector%36>17){
	316	x[1]*=-1;
	317	}
	318
	319	//
	320
	321	//
	322	// Z coordinate
	323	//
	324	x[2]*= zwidth; // tranform time bin to the distance to the ROC
	325	x[2]-= 3.param->GetZSigma() + param->GetNTBinsL1()zwidth+ time0corrTime;
	326	// subtract the time offsets
	327	x[2] = sign*( param->GetZLength(sector) - x[2]);
	328	}
	329
	330	void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const {
	331	//
	332	// transform possition rotated global to the global
	333	//
	334	Double_t cos,sin;
	335	GetCosAndSin(sector,cos,sin);
	336	Double_t tmp=x[0];
	337	x[0]= costmp-sinx[1];
	338	x[1]=+sintmp+cosx[1];
	339	}
	340
	341	void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const {
	342	//
	343	// tranform possition Global2RotatedGlobal
	344	//
	345	Double_t cos,sin;
	346	GetCosAndSin(sector,cos,sin);
	347	Double_t tmp=x[0];
	348	x[0]= costmp+sinx[1];
	349	x[1]= -sintmp+cosx[1];
	350	}
	351
	352	void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos,
	353	Double_t &sin) const {
	354	cos=fCoss[sector%18];
	355	sin=fSins[sector%18];
	356	}
	357
	358
	359	void AliTPCTransform::ApplyTransformations(Double_t /xyz/, Int_t /volID*/){
	360	//
	361	// Modify global position
	362	// xyz - global xyz position
	363	// volID - volID of detector (sector number)
	364	//
	365	//
	366
	367	}