1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.11 2001/03/14 18:21:24 jbarbosa
19 Corrected bug in digits loading.
21 Revision 1.10 2001/02/27 15:21:06 jbarbosa
22 Transition to SDigits.
24 Revision 1.9 2001/02/13 20:38:48 jbarbosa
25 Changes to make it work with new IO.
27 Revision 1.8 2000/11/01 15:37:18 jbarbosa
28 Updated to use its own rec. point object.
30 Revision 1.7 2000/10/03 21:44:09 morsch
31 Use AliSegmentation and AliHit abstract base classes.
33 Revision 1.6 2000/10/02 21:28:12 fca
34 Removal of useless dependecies via forward declarations
36 Revision 1.5 2000/10/02 15:50:25 jbarbosa
37 Fixed forward declarations.
39 Revision 1.4 2000/06/30 16:33:43 dibari
40 Several changes (ring drawing, fiducial selection, etc.)
42 Revision 1.3 2000/06/15 15:47:12 jbarbosa
43 Corrected compilation errors on HP-UX (replaced pow with TMath::Power)
45 Revision 1.2 2000/06/12 15:26:09 jbarbosa
48 Revision 1.1 2000/06/09 14:53:01 jbarbosa
49 Bari's pattern recognition algorithm
53 #include "AliRICHHit.h"
54 #include "AliRICHCerenkov.h"
55 #include "AliRICHSDigit.h"
56 #include "AliRICHDigit.h"
57 #include "AliRICHRawCluster.h"
58 #include "AliRICHRecHit1D.h"
60 #include "AliDetector.h"
62 #include "AliRICHPoints.h"
63 #include "AliSegmentation.h"
64 #include "AliRICHPatRec.h"
66 #include "AliRICHConst.h"
67 #include "AliRICHPoints.h"
69 #include "AliHitMap.h"
71 #include <TParticle.h>
79 ClassImp(AliRICHPatRec)
80 //___________________________________________
81 AliRICHPatRec::AliRICHPatRec() : TObject()
83 // Default constructor
87 //___________________________________________
88 AliRICHPatRec::AliRICHPatRec(const char *name, const char *title)
91 //Constructor for Bari's pattern recogniton method object
94 void AliRICHPatRec::PatRec()
97 // Pattern recognition algorithm
99 AliRICHChamber* iChamber;
100 AliSegmentation* segmentation;
102 Int_t ntracks, ndigits[kNCH];
108 Int_t padsUsedX[100];
109 Int_t padsUsedY[100];
113 //printf("PatRec started\n");
115 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
116 TTree *treeH = gAlice->TreeH();
118 ntracks =(Int_t) treeH->GetEntries();
120 for (itr=0; itr<ntracks; itr++) {
122 status = TrackParam(itr,ich,0,0);
123 if(status==1) continue;
124 //printf(" theta %f phi %f track \n",fTrackTheta,fTrackPhi);
125 // ring->Fill(fTrackLoc[0],fTrackLoc[1],100.);
127 iChamber = &(pRICH->Chamber(ich));
128 segmentation=iChamber->GetSegmentationModel();
130 nent=(Int_t)gAlice->TreeD()->GetEntries();
131 gAlice->TreeD()->GetEvent(0);
132 TClonesArray *pDigitss = pRICH->DigitsAddress(ich);
133 ndigits[ich] = pDigitss->GetEntriesFast();
134 printf("Digits in chamber %d: %d\n",ich,ndigits[ich]);
135 AliRICHDigit *padI = 0;
139 for (Int_t dig=0;dig<ndigits[ich];dig++) {
140 padI=(AliRICHDigit*) pDigitss->UncheckedAt(dig);
144 segmentation->GetPadC(x,y,rx,ry,rz);
146 //printf("Pad coordinates x:%d, Real coordinates x:%f\n",x,rx);
147 //printf("Pad coordinates y:%d, Real coordinates y:%f\n",y,ry);
153 fCerenkovAnglePad = PhotonCerenkovAngle();
154 if(fCerenkovAnglePad==-999) continue;
156 if(!PhotonInBand()) continue;
161 segmentation->GetPadI(fXpad,fYpad,0,xpad,ypad);
163 padsUsedX[goodPhotons]=xpad;
164 padsUsedY[goodPhotons]=ypad;
167 fEtaPhotons[goodPhotons-1] = fCerenkovAnglePad;
169 fNumEtaPhotons = goodPhotons;
171 BackgroundEstimation();
174 //CerenkovRingDrawing();
178 rechit[2] = fThetaCerenkov;
179 rechit[3] = fXshift + fTrackLoc[0];
180 rechit[4] = fYshift + fTrackLoc[1];
181 rechit[5] = fEmissPoint;
182 rechit[6] = goodPhotons;
184 //printf("Center coordinates:%f %f\n",rechit[3],rechit[4]);
186 pRICH->AddRecHit1D(ich,rechit,fEtaPhotons,padsUsedX,padsUsedY);
190 gAlice->TreeR()->Fill();
192 for (i=0;i<kNCH;i++) {
193 fRec=pRICH->RecHitsAddress1D(i);
194 int ndig=fRec->GetEntriesFast();
195 printf ("Chamber %d, rings %d\n",i,ndig);
197 pRICH->ResetRecHits1D();
202 Int_t AliRICHPatRec::TrackParam(Int_t itr, Int_t &ich, Float_t rectheta, Float_t recphi)
204 // Get Local coordinates of track impact
206 AliRICHChamber* iChamber;
207 AliSegmentation* segmentation;
209 Float_t trackglob[3];
217 //printf("Calling TrackParam\n");
220 TTree *treeH = gAlice->TreeH();
221 treeH->GetEvent(itr);
223 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
224 AliRICHHit* mHit=(AliRICHHit*)pRICH->FirstHit(-1);
225 if(mHit==0) return 1;
226 ich = mHit->fChamber-1;
227 trackglob[0] = mHit->X();
228 trackglob[1] = mHit->Y();
229 trackglob[2] = mHit->Z();
233 fTrackMom = sqrt(TMath::Power(pX,2)+TMath::Power(pY,2)+TMath::Power(pZ,2));
234 if(recphi!=0 || rectheta!=0)
241 thetatr = mHit->fTheta*TMath::Pi()/180;
242 phitr = mHit->fPhi*TMath::Pi()/180;
245 part = mHit->fParticle;
247 iChamber = &(pRICH->Chamber(ich));
248 iChamber->GlobaltoLocal(trackglob,trackloc);
250 segmentation=iChamber->GetSegmentationModel();
252 // retrieve geometrical params
254 AliRICHGeometry* fGeometry=iChamber->GetGeometryModel();
256 fRw = fGeometry->GetFreonThickness();
257 fQw = fGeometry->GetQuartzThickness();
258 fTgap = fGeometry->GetGapThickness();
259 Float_t radiatorToPads= fGeometry->GetRadiatorToPads();
260 //+ fGeometry->GetProximityGapThickness();
262 //printf("Distance to pads. From geometry:%f, From calculations:%f\n",radiatorToPads,fRw + fQw + fTgap);
264 //Float_t apar = (fRw + fQw + fTgap)*tan(thetatr);
265 Float_t apar = radiatorToPads*tan(thetatr);
266 fTrackLoc[0] = apar*cos(phitr);
267 fTrackLoc[1] = apar*sin(phitr);
268 //fTrackLoc[2] = fRw + fQw + fTgap;
269 fTrackLoc[2] = radiatorToPads;
270 fTrackTheta = thetatr;
273 fXshift = trackloc[0] - fTrackLoc[0];
274 fYshift = trackloc[2] - fTrackLoc[1];
279 Float_t AliRICHPatRec::EstimationAtLimits(Float_t lim, Float_t radius,
283 // Estimation of emission point
285 Float_t nquartz = 1.585;
287 Float_t nfreon = 1.295;
290 // printf("Calling EstimationLimits\n");
292 Float_t apar = (fRw -fEmissPoint + fQw + fTgap)*tan(fTrackTheta);
293 Float_t b1 = (fRw-fEmissPoint)*tan(lim);
294 Float_t b2 = fQw / sqrt(TMath::Power(nquartz,2)-TMath::Power(nfreon*sin(lim),2));
295 Float_t b3 = fTgap / sqrt(TMath::Power(ngas,2)-TMath::Power(nfreon*sin(lim),2));
296 Float_t bpar = b1 + nfreon*sin(lim)*(b2+b3);
297 value = TMath::Power(radius,2)
298 -TMath::Power((apar*cos(fTrackPhi)-bpar*cos(phiphot)),2)
299 -TMath::Power((apar*sin(fTrackPhi)-bpar*sin(phiphot)),2);
304 Float_t AliRICHPatRec::PhotonCerenkovAngle()
306 // Cherenkov pad angle reconstruction
310 Float_t cherMax = 0.8;
312 Float_t eps = 0.0001;
313 Int_t niterEmiss = 0;
314 Int_t niterEmissMax = 0;
315 Float_t x1,x2,x3=0,p1,p2,p3;
319 // printf("Calling PhotonCerenkovAngle\n");
321 radius = sqrt(TMath::Power(fTrackLoc[0]-fXpad,2)+TMath::Power(fTrackLoc[1]-fYpad,2));
322 fEmissPoint = fRw/2.; //Start value of EmissionPoint
324 while(niterEmiss<=niterEmissMax) {
327 argY = fYpad - fEmissPoint*tan(fTrackTheta)*sin(fTrackPhi);
328 argX = fXpad - fEmissPoint*tan(fTrackTheta)*cos(fTrackPhi);
329 phiphot = atan2(argY,argX);
330 p1 = EstimationAtLimits(cherMin,radius,phiphot);
331 p2 = EstimationAtLimits(cherMax,radius,phiphot);
334 // printf("PhotonCerenkovAngle failed\n");
338 //start to find the Cherenkov pad angle
342 p3 = EstimationAtLimits(x3,radius,phiphot);
343 while(TMath::Abs(p3)>eps){
347 p1 = EstimationAtLimits(x1,radius,phiphot);
350 p3 = EstimationAtLimits(x3,radius,phiphot);
354 // printf(" max iterations in PhotonCerenkovAngle\n");
358 // printf("niterFun %i \n",niterFun);
360 if (niterEmiss != niterEmissMax+1) EmissionPoint();
363 printf(" phiphot %f fXpad %f fYpad %f fEmiss %f \n",
364 phiphot,fXpad,fYpad,fEmissPoint);
372 void AliRICHPatRec::EmissionPoint()
375 // Find emission point
377 Float_t absorbtionLength=7.83*fRw; //absorption length in the freon (cm)
378 // 7.83 = -1/ln(T0) where
379 // T0->Trasmission freon at 180nm = 0.88 (Eph=6.85eV)
380 Float_t photonLength, photonLengthMin, photonLengthMax;
382 photonLength=exp(-fRw/(absorbtionLength*cos(fCerenkovAnglePad)));
383 photonLengthMin=fRw*photonLength/(1.-photonLength);
384 photonLengthMax=absorbtionLength*cos(fCerenkovAnglePad);
385 fEmissPoint = fRw + photonLengthMin - photonLengthMax;
389 void AliRICHPatRec::PhotonSelection(Int_t track, Int_t &nphot, Float_t &thetamean)
392 // not implemented yet
394 printf("Calling PhotonSelection\n");
397 void AliRICHPatRec::BackgroundEstimation()
400 // estimate background noise
402 Float_t stepEta = 0.001;
403 Float_t etaMinBkg = 0.72;
404 Float_t etaMaxBkg = 0.75;
406 Float_t etaMax = 0.75;
408 Float_t nfreon = 1.295;
410 Float_t etaStepMin,etaStepMax,etaStepAvg;
412 Int_t numPhotBkg, numPhotonStep;
413 Float_t funBkg,areaBkg,normBkg;
414 Float_t densityBkg,storeBkg,numStore;
420 nstep = (int)((etaMaxBkg-etaMinBkg)/stepEta);
422 for (i=0;i<fNumEtaPhotons;i++) {
424 if(fEtaPhotons[i]>etaMinBkg && fEtaPhotons[i]<etaMaxBkg) {
428 if (numPhotBkg == 0) {
429 for (i=0;i<fNumEtaPhotons;i++) {
430 fWeightPhotons[i] = 1.;
435 // printf(" numPhotBkg %i ",numPhotBkg);
437 for (i=0;i<nstep;i++) {
438 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
439 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
440 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
442 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
443 5.52)-7.803 + 22.02*tan(etaStepAvg);
446 //printf("etaStepAvg: %f, etaStepMax: %f, etaStepMin: %f", etaStepAvg,etaStepMax,etaStepMin);
448 thetaSig = TMath::ASin(nfreon/ngas*TMath::Sin(etaStepAvg));
449 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
450 /ngas*cos(etaStepAvg)/cos(thetaSig);
451 areaBkg += stepEta*funBkg;
454 densityBkg = 0.95*(Float_t)(numPhotBkg)/areaBkg;
455 // printf(" densityBkg %f \n",densityBkg);
457 nstep = (int)((etaMax-etaMin)/stepEta);
460 for (i=0;i<nstep;i++) {
461 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
462 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
463 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
465 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
466 5.52)-7.803 + 22.02*tan(etaStepAvg);
469 thetaSig = asin(nfreon/ngas*sin(etaStepAvg));
470 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
471 /ngas*cos(etaStepAvg)/cos(thetaSig);
473 areaBkg = stepEta*funBkg;
474 normBkg = densityBkg*areaBkg;
476 for (ip=0;ip<fNumEtaPhotons;ip++) {
477 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
481 if (numPhotonStep == 0) {
489 if (numPhotonStep == 0) continue;
490 for (ip=0;ip<fNumEtaPhotons;ip++) {
491 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
495 fWeightPhotons[ip] = 1. - normBkg/(Float_t)(numPhotonStep);
497 printf(" normBkg %f numPhotonStep %i fW %f \n",
498 normBkg, numPhotonStep, fWeightPhotons[ip]);
500 if(fWeightPhotons[ip]<0) fWeightPhotons[ip] = 0.;
507 void AliRICHPatRec::FlagPhotons(Int_t track, Float_t theta)
510 // not implemented yet
512 printf("Calling FlagPhotons\n");
516 //////////////////////////////////////////
522 Int_t AliRICHPatRec::PhotonInBand()
524 //0=label for parameters giving internal band ellipse
525 //1=label for parameters giving external band ellipse
527 Float_t imp[2], mass[2], energy[2], beta[2];
528 Float_t emissPointLength[2];
529 Float_t e1, e2, f1, f2;
530 Float_t nfreon[2], nquartz[2];
532 Float_t pointsOnCathode[3];
534 Float_t phpad, thetacer[2];
535 Float_t bandradius[2], padradius;
537 imp[0] = 5.0; //threshold momentum for the proton Cherenkov emission
540 mass[0] = 0.938; //proton mass
541 mass[1] = 0.139; //pion mass
543 emissPointLength[0] = fRw-0.0001; //at the beginning of the radiator
544 emissPointLength[1] = 0.;//at the end of radiator
546 //parameters to calculate freon window refractive index vs. energy
550 //parameters to calculate quartz window refractive index vs. energy
562 phpad = PhiPad(fTrackTheta,fTrackPhi);
564 for (times=0; times<=1; times++) {
566 nfreon[times] = a+b*energy[times];
569 nquartz[times] = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(energy[times],2)))+
570 (f2/(TMath::Power(e2,2)-TMath::Power(energy[times],2))));
572 beta[times] = imp[times]/sqrt(TMath::Power(imp[times],2)+TMath::Power(mass[times],2));
574 thetacer[times] = CherenkovAngle( nfreon[times], beta[times]);
576 bandradius[times] = DistanceFromMip( nfreon[times], nquartz[times],
577 emissPointLength[times],
578 thetacer[times], phpad, pointsOnCathode,fTrackTheta,fTrackPhi);
579 //printf(" ppp %f %f %f \n",pointsOnCathode);
582 bandradius[0] -= 1.6;
583 bandradius[1] += 1.6;
584 padradius = sqrt(TMath::Power(fXpad,2)+TMath::Power(fYpad,2));
585 // printf(" rmin %f r %f rmax %f \n",bandradius[0],padradius,bandradius[1]);
587 if(padradius>=bandradius[0] && padradius<=bandradius[1]) return 1;
591 Float_t AliRICHPatRec::DistanceFromMip(Float_t nfreon, Float_t nquartz,
592 Float_t emissPointLength, Float_t thetacer,
593 Float_t phpad, Float_t pointsOnCathode[3], Float_t rectheta, Float_t recphi)
596 // Find the distance to MIP impact
598 Float_t distanceValue;
600 TVector3 radExitPhot(1,1,1);//photon impact at the radiator exit with respect
601 //to local reference sistem with the origin in the MIP entrance
603 TVector3 vectEmissPointLength(1,1,1);
604 Float_t magEmissPointLenght;
606 TVector3 radExitPhot2(1,1,1);//photon impact at the radiator exit with respect
607 Float_t magRadExitPhot2;
608 //to a reference sistem with origin in the photon emission point and
609 //axes parallel to the MIP reference sistem
611 TVector3 quarExitPhot(1,1,1);//photon impact at the quartz exit with respect
612 Float_t magQuarExitPhot;
614 TVector3 gapExitPhot(1,1,1) ;
615 Float_t magGapExitPhot;
617 TVector3 PhotocatExitPhot(1,1,1);
619 Double_t thetarad , phirad ;
620 Double_t thetaquar, phiquar;
621 Double_t thetagap , phigap ;
625 magEmissPointLenght = emissPointLength/cos(rectheta);
627 vectEmissPointLength.SetMag(magEmissPointLenght);
628 vectEmissPointLength.SetTheta(rectheta);
629 vectEmissPointLength.SetPhi(recphi);
632 radExitPhot2.SetTheta(thetacer);
633 radExitPhot2.SetPhi(phpad);
640 r1. RotateY(rectheta);
645 r = r2 * r1;//rotation about the y axis by MIP theta incidence angle
646 //following by a rotation about the z axis by MIP phi incidence angle;
649 radExitPhot2 = r * radExitPhot2;
650 theta2 = radExitPhot2.Theta();
651 magRadExitPhot2 = (fRw - vectEmissPointLength(2))/cos(theta2);
652 radExitPhot2.SetMag(magRadExitPhot2);
655 radExitPhot = vectEmissPointLength + radExitPhot2;
656 thetarad = radExitPhot.Theta();
657 phirad = radExitPhot.Phi(); //check on the original file //
659 thetaquar = SnellAngle( nfreon, nquartz, theta2);
660 phiquar = radExitPhot2.Phi();
661 if(thetaquar == 999.) return thetaquar;
662 magQuarExitPhot = fQw/cos(thetaquar);
663 quarExitPhot.SetMag( magQuarExitPhot);
664 quarExitPhot.SetTheta(thetaquar);
665 quarExitPhot.SetPhi(phiquar);
667 thetagap = SnellAngle( nquartz, ngas, thetaquar);
669 if(thetagap == 999.) return thetagap;
670 magGapExitPhot = fTgap/cos(thetagap);
671 gapExitPhot.SetMag( magGapExitPhot);
672 gapExitPhot.SetTheta(thetagap);
673 gapExitPhot.SetPhi(phigap);
675 PhotocatExitPhot = radExitPhot + quarExitPhot + gapExitPhot;
677 distanceValue = sqrt(TMath::Power(PhotocatExitPhot(0),2)
678 +TMath::Power(PhotocatExitPhot(1),2));
679 pointsOnCathode[0] = (Float_t) PhotocatExitPhot(0) + fXshift - fTrackLoc[0];
680 pointsOnCathode[1] = (Float_t) PhotocatExitPhot(1) + fYshift - fTrackLoc[1];
681 pointsOnCathode[2] = (Float_t) PhotocatExitPhot(2);
683 //printf(" point in Distance.2. %f %f %f \n",pointsOnCathode[0],pointsOnCathode[1],pointsOnCathode[2]);
685 return distanceValue;
689 Float_t AliRICHPatRec::PhiPad(Float_t rectheta, Float_t recphi)
695 Float_t thetapad, phipad;
696 Float_t thetarot, phirot;
698 zpad = fRw + fQw + fTgap;
700 TVector3 photonPad(fXpad, fYpad, zpad);
701 thetapad = photonPad.Theta();
702 phipad = photonPad.Phi();
708 thetarot = - rectheta;
711 r2. RotateY(thetarot);
713 r = r2 * r1;//rotation about the z axis by MIP -phi incidence angle
714 //following by a rotation about the y axis by MIP -theta incidence angle;
716 photonPad = r * photonPad;
718 phipad = photonPad.Phi();
723 Float_t AliRICHPatRec:: SnellAngle(Float_t n1, Float_t n2, Float_t theta1)
726 // Compute the Snell angle
728 Float_t sinrefractangle;
729 Float_t refractangle;
731 sinrefractangle = (n1/n2)*sin(theta1);
733 if(sinrefractangle>1.) {
738 refractangle = asin(sinrefractangle);
742 Float_t AliRICHPatRec::CherenkovAngle(Float_t n, Float_t beta)
745 // Compute the cerenkov angle
754 thetacer = acos (1./(n*beta));
758 Float_t AliRICHPatRec::BetaCerenkov(Float_t n, Float_t theta)
765 beta = 1./(n*cos(theta));
772 void AliRICHPatRec::HoughResponse()
776 // Implement Hough response pat. rec. method
781 int i, j, k, nCorrBand;
784 float angle, thetaCerMean;
789 float stepEta = 0.001;
790 float windowEta = 0.040;
794 float etaPeakPos = -1;
795 Int_t etaPeakCount = -1;
800 nBin = (int)(0.5+etaMax/(stepEta));
801 nCorrBand = (int)(0.5+ windowEta/(2 * stepEta));
802 memset ((void *)hcs, 0, etaBin*sizeof(int));
804 for (k=0; k< fNumEtaPhotons; k++) {
806 angle = fEtaPhotons[k];
808 if (angle>=etaMin && angle<= etaMax) {
809 bin = (int)(0.5+angle/(stepEta));
813 if (bin2>nBin) bin2=nBin;
815 for (j=bin1; j<bin2; j++) {
816 hcs[j] += fWeightPhotons[k];
819 thetaCerMean += angle;
823 thetaCerMean /= fNumEtaPhotons;
827 for (bin=0; bin <nBin; bin++) {
828 angle = (bin+0.5) * (stepEta);
829 if (hcs[bin] && hcs[bin] > etaPeakPos) {
831 etaPeakPos = hcs[bin];
835 if (hcs[bin] == etaPeakPos) {
836 etaPeak[++etaPeakCount] = angle;
841 for (i=0; i<etaPeakCount+1; i++) {
842 fThetaCerenkov += etaPeak[i];
844 if (etaPeakCount>=0) {
845 fThetaCerenkov /= etaPeakCount+1;
846 fThetaPeakPos = etaPeakPos;
851 void AliRICHPatRec::HoughFiltering(float hcs[])
857 float k[5] = {0.05, 0.25, 0.4, 0.25, 0.05};
864 float stepEta = 0.001;
866 nBin = (int)(1+etaMax/stepEta);
867 sizeHCS = etaBin*sizeof(float);
869 memset ((void *)hcsFilt, 0, sizeHCS);
871 for (nx = 0; nx < nBin; nx++) {
872 for (i = 0; i < 5; i++) {
874 if (nxDx> -1 && nxDx<nBin)
875 hcsFilt[nx] += hcs[nxDx] * k[i];
879 for (nx = 0; nx < nBin; nx++) {
880 hcs[nx] = hcsFilt[nx];
884 /*void AliRICHPatRec::CerenkovRingDrawing()
887 //to draw Cherenkov ring by known Cherenkov angle
892 Float_t nfreonave, nquartzave;
895 Float_t e1, e2, f1, f2;
898 //parameters to calculate freon window refractive index vs. energy
903 //parameters to calculate quartz window refractive index vs. energy
915 for (Nphpad=0; Nphpad<nmaxdegrees;Nphpad++) {
917 phpad = (360./(Float_t)nmaxdegrees)*(Float_t)Nphpad;
919 aveEnerg = (energy[0]+energy[1])/2.;
921 nfreonave = a+b*aveEnerg;
922 nquartzave = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(aveEnerg,2)))+
923 (f2/(TMath::Power(e2,2)-TMath::Power(aveEnerg,2))));
925 bandradius = DistanceFromMip(nfreonave, nquartzave,
926 fEmissPoint,fThetaCerenkov, phpad);
928 fCoordEllipse[0][Nphpad] = fOnCathode[0];
929 fCoordEllipse[1][Nphpad] = fOnCathode[1];
930 printf(" values %f %f \n",fOnCathode[0],fOnCathode[1]);