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 1.12 2001/05/10 12:34:23 jbarbosa
19 Changed drwaing routines.
21 Revision 1.11 2001/03/14 18:21:24 jbarbosa
22 Corrected bug in digits loading.
24 Revision 1.10 2001/02/27 15:21:06 jbarbosa
25 Transition to SDigits.
27 Revision 1.9 2001/02/13 20:38:48 jbarbosa
28 Changes to make it work with new IO.
30 Revision 1.8 2000/11/01 15:37:18 jbarbosa
31 Updated to use its own rec. point object.
33 Revision 1.7 2000/10/03 21:44:09 morsch
34 Use AliSegmentation and AliHit abstract base classes.
36 Revision 1.6 2000/10/02 21:28:12 fca
37 Removal of useless dependecies via forward declarations
39 Revision 1.5 2000/10/02 15:50:25 jbarbosa
40 Fixed forward declarations.
42 Revision 1.4 2000/06/30 16:33:43 dibari
43 Several changes (ring drawing, fiducial selection, etc.)
45 Revision 1.3 2000/06/15 15:47:12 jbarbosa
46 Corrected compilation errors on HP-UX (replaced pow with TMath::Power)
48 Revision 1.2 2000/06/12 15:26:09 jbarbosa
51 Revision 1.1 2000/06/09 14:53:01 jbarbosa
52 Bari's pattern recognition algorithm
56 #include "AliRICHHit.h"
57 #include "AliRICHCerenkov.h"
58 #include "AliRICHSDigit.h"
59 #include "AliRICHDigit.h"
60 #include "AliRICHRawCluster.h"
61 #include "AliRICHRecHit1D.h"
63 #include "AliDetector.h"
65 #include "AliRICHPoints.h"
66 #include "AliSegmentation.h"
67 #include "AliRICHPatRec.h"
69 #include "AliRICHConst.h"
70 #include "AliRICHPoints.h"
72 #include "AliHitMap.h"
74 #include <TParticle.h>
82 ClassImp(AliRICHPatRec)
83 //___________________________________________
84 AliRICHPatRec::AliRICHPatRec() : TObject()
86 // Default constructor
90 //___________________________________________
91 AliRICHPatRec::AliRICHPatRec(const char *name, const char *title)
94 //Constructor for Bari's pattern recogniton method object
97 void AliRICHPatRec::PatRec()
100 // Pattern recognition algorithm
102 AliRICHChamber* iChamber;
103 AliSegmentation* segmentation;
105 Int_t ntracks, ndigits[kNCH];
111 Int_t padsUsedX[100];
112 Int_t padsUsedY[100];
116 //printf("PatRec started\n");
118 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
119 TTree *treeH = gAlice->TreeH();
121 ntracks =(Int_t) treeH->GetEntries();
123 for (itr=0; itr<ntracks; itr++) {
125 status = TrackParam(itr,ich,0,0);
126 if(status==1) continue;
127 //printf(" theta %f phi %f track \n",fTrackTheta,fTrackPhi);
128 // ring->Fill(fTrackLoc[0],fTrackLoc[1],100.);
130 iChamber = &(pRICH->Chamber(ich));
131 segmentation=iChamber->GetSegmentationModel();
133 nent=(Int_t)gAlice->TreeD()->GetEntries();
134 gAlice->TreeD()->GetEvent(0);
135 TClonesArray *pDigitss = pRICH->DigitsAddress(ich);
136 ndigits[ich] = pDigitss->GetEntriesFast();
137 printf("Digits in chamber %d: %d\n",ich,ndigits[ich]);
138 AliRICHDigit *padI = 0;
142 for (Int_t dig=0;dig<ndigits[ich];dig++) {
143 padI=(AliRICHDigit*) pDigitss->UncheckedAt(dig);
147 segmentation->GetPadC(x,y,rx,ry,rz);
149 //printf("Pad coordinates x:%d, Real coordinates x:%f\n",x,rx);
150 //printf("Pad coordinates y:%d, Real coordinates y:%f\n",y,ry);
156 fCerenkovAnglePad = PhotonCerenkovAngle();
157 if(fCerenkovAnglePad==-999) continue;
159 if(!PhotonInBand()) continue;
164 segmentation->GetPadI(fXpad,fYpad,0,xpad,ypad);
166 padsUsedX[goodPhotons]=xpad;
167 padsUsedY[goodPhotons]=ypad;
170 fEtaPhotons[goodPhotons-1] = fCerenkovAnglePad;
172 fNumEtaPhotons = goodPhotons;
174 BackgroundEstimation();
177 //CerenkovRingDrawing();
181 rechit[2] = fThetaCerenkov;
182 rechit[3] = fXshift + fTrackLoc[0];
183 rechit[4] = fYshift + fTrackLoc[1];
184 rechit[5] = fEmissPoint;
185 rechit[6] = goodPhotons;
187 //printf("Center coordinates:%f %f\n",rechit[3],rechit[4]);
189 pRICH->AddRecHit1D(ich,rechit,fEtaPhotons,padsUsedX,padsUsedY);
193 gAlice->TreeR()->Fill();
195 for (i=0;i<kNCH;i++) {
196 fRec=pRICH->RecHitsAddress1D(i);
197 int ndig=fRec->GetEntriesFast();
198 printf ("Chamber %d, rings %d\n",i,ndig);
200 pRICH->ResetRecHits1D();
205 Int_t AliRICHPatRec::TrackParam(Int_t itr, Int_t &ich, Float_t rectheta, Float_t recphi)
207 // Get Local coordinates of track impact
209 AliRICHChamber* iChamber;
210 AliSegmentation* segmentation;
212 Float_t trackglob[3];
220 //printf("Calling TrackParam\n");
223 TTree *treeH = gAlice->TreeH();
224 treeH->GetEvent(itr);
226 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
227 AliRICHHit* mHit=(AliRICHHit*)pRICH->FirstHit(-1);
228 if(mHit==0) return 1;
229 ich = mHit->Chamber()-1;
230 trackglob[0] = mHit->X();
231 trackglob[1] = mHit->Y();
232 trackglob[2] = mHit->Z();
236 fTrackMom = sqrt(TMath::Power(pX,2)+TMath::Power(pY,2)+TMath::Power(pZ,2));
237 if(recphi!=0 || rectheta!=0)
244 thetatr = mHit->Theta()*TMath::Pi()/180;
245 phitr = mHit->Phi()*TMath::Pi()/180;
247 iloss = mHit->Loss();
248 part = mHit->Particle();
250 iChamber = &(pRICH->Chamber(ich));
251 iChamber->GlobaltoLocal(trackglob,trackloc);
253 segmentation=iChamber->GetSegmentationModel();
255 // retrieve geometrical params
257 AliRICHGeometry* fGeometry=iChamber->GetGeometryModel();
259 fRw = fGeometry->GetFreonThickness();
260 fQw = fGeometry->GetQuartzThickness();
261 fTgap = fGeometry->GetGapThickness();
262 Float_t radiatorToPads= fGeometry->GetRadiatorToPads();
263 //+ fGeometry->GetProximityGapThickness();
265 //printf("Distance to pads. From geometry:%f, From calculations:%f\n",radiatorToPads,fRw + fQw + fTgap);
267 //Float_t apar = (fRw + fQw + fTgap)*tan(thetatr);
268 Float_t apar = radiatorToPads*tan(thetatr);
269 fTrackLoc[0] = apar*cos(phitr);
270 fTrackLoc[1] = apar*sin(phitr);
271 //fTrackLoc[2] = fRw + fQw + fTgap;
272 fTrackLoc[2] = radiatorToPads;
273 fTrackTheta = thetatr;
276 fXshift = trackloc[0] - fTrackLoc[0];
277 fYshift = trackloc[2] - fTrackLoc[1];
282 Float_t AliRICHPatRec::EstimationAtLimits(Float_t lim, Float_t radius,
286 // Estimation of emission point
288 Float_t nquartz = 1.585;
290 Float_t nfreon = 1.295;
293 // printf("Calling EstimationLimits\n");
295 Float_t apar = (fRw -fEmissPoint + fQw + fTgap)*tan(fTrackTheta);
296 Float_t b1 = (fRw-fEmissPoint)*tan(lim);
297 Float_t b2 = fQw / sqrt(TMath::Power(nquartz,2)-TMath::Power(nfreon*sin(lim),2));
298 Float_t b3 = fTgap / sqrt(TMath::Power(ngas,2)-TMath::Power(nfreon*sin(lim),2));
299 Float_t bpar = b1 + nfreon*sin(lim)*(b2+b3);
300 value = TMath::Power(radius,2)
301 -TMath::Power((apar*cos(fTrackPhi)-bpar*cos(phiphot)),2)
302 -TMath::Power((apar*sin(fTrackPhi)-bpar*sin(phiphot)),2);
307 Float_t AliRICHPatRec::PhotonCerenkovAngle()
309 // Cherenkov pad angle reconstruction
313 Float_t cherMax = 0.8;
315 Float_t eps = 0.0001;
316 Int_t niterEmiss = 0;
317 Int_t niterEmissMax = 0;
318 Float_t x1,x2,x3=0,p1,p2,p3;
322 // printf("Calling PhotonCerenkovAngle\n");
324 radius = sqrt(TMath::Power(fTrackLoc[0]-fXpad,2)+TMath::Power(fTrackLoc[1]-fYpad,2));
325 fEmissPoint = fRw/2.; //Start value of EmissionPoint
327 while(niterEmiss<=niterEmissMax) {
330 argY = fYpad - fEmissPoint*tan(fTrackTheta)*sin(fTrackPhi);
331 argX = fXpad - fEmissPoint*tan(fTrackTheta)*cos(fTrackPhi);
332 phiphot = atan2(argY,argX);
333 p1 = EstimationAtLimits(cherMin,radius,phiphot);
334 p2 = EstimationAtLimits(cherMax,radius,phiphot);
337 // printf("PhotonCerenkovAngle failed\n");
341 //start to find the Cherenkov pad angle
345 p3 = EstimationAtLimits(x3,radius,phiphot);
346 while(TMath::Abs(p3)>eps){
350 p1 = EstimationAtLimits(x1,radius,phiphot);
353 p3 = EstimationAtLimits(x3,radius,phiphot);
357 // printf(" max iterations in PhotonCerenkovAngle\n");
361 // printf("niterFun %i \n",niterFun);
363 if (niterEmiss != niterEmissMax+1) EmissionPoint();
366 printf(" phiphot %f fXpad %f fYpad %f fEmiss %f \n",
367 phiphot,fXpad,fYpad,fEmissPoint);
375 void AliRICHPatRec::EmissionPoint()
378 // Find emission point
380 Float_t absorbtionLength=7.83*fRw; //absorption length in the freon (cm)
381 // 7.83 = -1/ln(T0) where
382 // T0->Trasmission freon at 180nm = 0.88 (Eph=6.85eV)
383 Float_t photonLength, photonLengthMin, photonLengthMax;
385 photonLength=exp(-fRw/(absorbtionLength*cos(fCerenkovAnglePad)));
386 photonLengthMin=fRw*photonLength/(1.-photonLength);
387 photonLengthMax=absorbtionLength*cos(fCerenkovAnglePad);
388 fEmissPoint = fRw + photonLengthMin - photonLengthMax;
392 void AliRICHPatRec::PhotonSelection(Int_t track, Int_t &nphot, Float_t &thetamean)
395 // not implemented yet
397 printf("Calling PhotonSelection\n");
400 void AliRICHPatRec::BackgroundEstimation()
403 // estimate background noise
405 Float_t stepEta = 0.001;
406 Float_t etaMinBkg = 0.72;
407 Float_t etaMaxBkg = 0.75;
409 Float_t etaMax = 0.75;
411 Float_t nfreon = 1.295;
413 Float_t etaStepMin,etaStepMax,etaStepAvg;
415 Int_t numPhotBkg, numPhotonStep;
416 Float_t funBkg,areaBkg,normBkg;
417 Float_t densityBkg,storeBkg,numStore;
423 nstep = (int)((etaMaxBkg-etaMinBkg)/stepEta);
425 for (i=0;i<fNumEtaPhotons;i++) {
427 if(fEtaPhotons[i]>etaMinBkg && fEtaPhotons[i]<etaMaxBkg) {
431 if (numPhotBkg == 0) {
432 for (i=0;i<fNumEtaPhotons;i++) {
433 fWeightPhotons[i] = 1.;
438 // printf(" numPhotBkg %i ",numPhotBkg);
440 for (i=0;i<nstep;i++) {
441 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
442 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
443 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
445 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
446 5.52)-7.803 + 22.02*tan(etaStepAvg);
449 //printf("etaStepAvg: %f, etaStepMax: %f, etaStepMin: %f", etaStepAvg,etaStepMax,etaStepMin);
451 thetaSig = TMath::ASin(nfreon/ngas*TMath::Sin(etaStepAvg));
452 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
453 /ngas*cos(etaStepAvg)/cos(thetaSig);
454 areaBkg += stepEta*funBkg;
457 densityBkg = 0.95*(Float_t)(numPhotBkg)/areaBkg;
458 // printf(" densityBkg %f \n",densityBkg);
460 nstep = (int)((etaMax-etaMin)/stepEta);
463 for (i=0;i<nstep;i++) {
464 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
465 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
466 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
468 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
469 5.52)-7.803 + 22.02*tan(etaStepAvg);
472 thetaSig = asin(nfreon/ngas*sin(etaStepAvg));
473 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
474 /ngas*cos(etaStepAvg)/cos(thetaSig);
476 areaBkg = stepEta*funBkg;
477 normBkg = densityBkg*areaBkg;
479 for (ip=0;ip<fNumEtaPhotons;ip++) {
480 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
484 if (numPhotonStep == 0) {
492 if (numPhotonStep == 0) continue;
493 for (ip=0;ip<fNumEtaPhotons;ip++) {
494 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
498 fWeightPhotons[ip] = 1. - normBkg/(Float_t)(numPhotonStep);
500 printf(" normBkg %f numPhotonStep %i fW %f \n",
501 normBkg, numPhotonStep, fWeightPhotons[ip]);
503 if(fWeightPhotons[ip]<0) fWeightPhotons[ip] = 0.;
510 void AliRICHPatRec::FlagPhotons(Int_t track, Float_t theta)
513 // not implemented yet
515 printf("Calling FlagPhotons\n");
519 //////////////////////////////////////////
525 Int_t AliRICHPatRec::PhotonInBand()
527 //0=label for parameters giving internal band ellipse
528 //1=label for parameters giving external band ellipse
530 Float_t imp[2], mass[2], energy[2], beta[2];
531 Float_t emissPointLength[2];
532 Float_t e1, e2, f1, f2;
533 Float_t nfreon[2], nquartz[2];
535 Float_t pointsOnCathode[3];
537 Float_t phpad, thetacer[2];
538 Float_t bandradius[2], padradius;
540 imp[0] = 5.0; //threshold momentum for the proton Cherenkov emission
543 mass[0] = 0.938; //proton mass
544 mass[1] = 0.139; //pion mass
546 emissPointLength[0] = fRw-0.0001; //at the beginning of the radiator
547 emissPointLength[1] = 0.;//at the end of radiator
549 //parameters to calculate freon window refractive index vs. energy
553 //parameters to calculate quartz window refractive index vs. energy
565 phpad = PhiPad(fTrackTheta,fTrackPhi);
567 for (times=0; times<=1; times++) {
569 nfreon[times] = a+b*energy[times];
572 nquartz[times] = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(energy[times],2)))+
573 (f2/(TMath::Power(e2,2)-TMath::Power(energy[times],2))));
575 beta[times] = imp[times]/sqrt(TMath::Power(imp[times],2)+TMath::Power(mass[times],2));
577 thetacer[times] = CherenkovAngle( nfreon[times], beta[times]);
579 bandradius[times] = DistanceFromMip( nfreon[times], nquartz[times],
580 emissPointLength[times],
581 thetacer[times], phpad, pointsOnCathode,fTrackTheta,fTrackPhi);
582 //printf(" ppp %f %f %f \n",pointsOnCathode);
585 bandradius[0] -= 1.6;
586 bandradius[1] += 1.6;
587 padradius = sqrt(TMath::Power(fXpad,2)+TMath::Power(fYpad,2));
588 // printf(" rmin %f r %f rmax %f \n",bandradius[0],padradius,bandradius[1]);
590 if(padradius>=bandradius[0] && padradius<=bandradius[1]) return 1;
594 Float_t AliRICHPatRec::DistanceFromMip(Float_t nfreon, Float_t nquartz,
595 Float_t emissPointLength, Float_t thetacer,
596 Float_t phpad, Float_t pointsOnCathode[3], Float_t rectheta, Float_t recphi)
599 // Find the distance to MIP impact
601 Float_t distanceValue;
603 TVector3 radExitPhot(1,1,1);//photon impact at the radiator exit with respect
604 //to local reference sistem with the origin in the MIP entrance
606 TVector3 vectEmissPointLength(1,1,1);
607 Float_t magEmissPointLenght;
609 TVector3 radExitPhot2(1,1,1);//photon impact at the radiator exit with respect
610 Float_t magRadExitPhot2;
611 //to a reference sistem with origin in the photon emission point and
612 //axes parallel to the MIP reference sistem
614 TVector3 quarExitPhot(1,1,1);//photon impact at the quartz exit with respect
615 Float_t magQuarExitPhot;
617 TVector3 gapExitPhot(1,1,1) ;
618 Float_t magGapExitPhot;
620 TVector3 PhotocatExitPhot(1,1,1);
622 Double_t thetarad , phirad ;
623 Double_t thetaquar, phiquar;
624 Double_t thetagap , phigap ;
628 magEmissPointLenght = emissPointLength/cos(rectheta);
630 vectEmissPointLength.SetMag(magEmissPointLenght);
631 vectEmissPointLength.SetTheta(rectheta);
632 vectEmissPointLength.SetPhi(recphi);
635 radExitPhot2.SetTheta(thetacer);
636 radExitPhot2.SetPhi(phpad);
643 r1. RotateY(rectheta);
648 r = r2 * r1;//rotation about the y axis by MIP theta incidence angle
649 //following by a rotation about the z axis by MIP phi incidence angle;
652 radExitPhot2 = r * radExitPhot2;
653 theta2 = radExitPhot2.Theta();
654 magRadExitPhot2 = (fRw - vectEmissPointLength(2))/cos(theta2);
655 radExitPhot2.SetMag(magRadExitPhot2);
658 radExitPhot = vectEmissPointLength + radExitPhot2;
659 thetarad = radExitPhot.Theta();
660 phirad = radExitPhot.Phi(); //check on the original file //
662 thetaquar = SnellAngle( nfreon, nquartz, theta2);
663 phiquar = radExitPhot2.Phi();
664 if(thetaquar == 999.) return thetaquar;
665 magQuarExitPhot = fQw/cos(thetaquar);
666 quarExitPhot.SetMag( magQuarExitPhot);
667 quarExitPhot.SetTheta(thetaquar);
668 quarExitPhot.SetPhi(phiquar);
670 thetagap = SnellAngle( nquartz, ngas, thetaquar);
672 if(thetagap == 999.) return thetagap;
673 magGapExitPhot = fTgap/cos(thetagap);
674 gapExitPhot.SetMag( magGapExitPhot);
675 gapExitPhot.SetTheta(thetagap);
676 gapExitPhot.SetPhi(phigap);
678 PhotocatExitPhot = radExitPhot + quarExitPhot + gapExitPhot;
680 distanceValue = sqrt(TMath::Power(PhotocatExitPhot(0),2)
681 +TMath::Power(PhotocatExitPhot(1),2));
682 pointsOnCathode[0] = (Float_t) PhotocatExitPhot(0) + fXshift - fTrackLoc[0];
683 pointsOnCathode[1] = (Float_t) PhotocatExitPhot(1) + fYshift - fTrackLoc[1];
684 pointsOnCathode[2] = (Float_t) PhotocatExitPhot(2);
686 //printf(" point in Distance.2. %f %f %f \n",pointsOnCathode[0],pointsOnCathode[1],pointsOnCathode[2]);
688 return distanceValue;
692 Float_t AliRICHPatRec::PhiPad(Float_t rectheta, Float_t recphi)
698 Float_t thetapad, phipad;
699 Float_t thetarot, phirot;
701 zpad = fRw + fQw + fTgap;
703 TVector3 photonPad(fXpad, fYpad, zpad);
704 thetapad = photonPad.Theta();
705 phipad = photonPad.Phi();
711 thetarot = - rectheta;
714 r2. RotateY(thetarot);
716 r = r2 * r1;//rotation about the z axis by MIP -phi incidence angle
717 //following by a rotation about the y axis by MIP -theta incidence angle;
719 photonPad = r * photonPad;
721 phipad = photonPad.Phi();
726 Float_t AliRICHPatRec:: SnellAngle(Float_t n1, Float_t n2, Float_t theta1)
729 // Compute the Snell angle
731 Float_t sinrefractangle;
732 Float_t refractangle;
734 sinrefractangle = (n1/n2)*sin(theta1);
736 if(sinrefractangle>1.) {
741 refractangle = asin(sinrefractangle);
745 Float_t AliRICHPatRec::CherenkovAngle(Float_t n, Float_t beta)
748 // Compute the cerenkov angle
757 thetacer = acos (1./(n*beta));
761 Float_t AliRICHPatRec::BetaCerenkov(Float_t n, Float_t theta)
768 beta = 1./(n*cos(theta));
775 void AliRICHPatRec::HoughResponse()
779 // Implement Hough response pat. rec. method
784 int i, j, k, nCorrBand;
787 float angle, thetaCerMean;
792 float stepEta = 0.001;
793 float windowEta = 0.040;
797 float etaPeakPos = -1;
798 Int_t etaPeakCount = -1;
803 nBin = (int)(0.5+etaMax/(stepEta));
804 nCorrBand = (int)(0.5+ windowEta/(2 * stepEta));
805 memset ((void *)hcs, 0, etaBin*sizeof(int));
807 for (k=0; k< fNumEtaPhotons; k++) {
809 angle = fEtaPhotons[k];
811 if (angle>=etaMin && angle<= etaMax) {
812 bin = (int)(0.5+angle/(stepEta));
816 if (bin2>nBin) bin2=nBin;
818 for (j=bin1; j<bin2; j++) {
819 hcs[j] += fWeightPhotons[k];
822 thetaCerMean += angle;
826 thetaCerMean /= fNumEtaPhotons;
830 for (bin=0; bin <nBin; bin++) {
831 angle = (bin+0.5) * (stepEta);
832 if (hcs[bin] && hcs[bin] > etaPeakPos) {
834 etaPeakPos = hcs[bin];
838 if (hcs[bin] == etaPeakPos) {
839 etaPeak[++etaPeakCount] = angle;
844 for (i=0; i<etaPeakCount+1; i++) {
845 fThetaCerenkov += etaPeak[i];
847 if (etaPeakCount>=0) {
848 fThetaCerenkov /= etaPeakCount+1;
849 fThetaPeakPos = etaPeakPos;
854 void AliRICHPatRec::HoughFiltering(float hcs[])
860 float k[5] = {0.05, 0.25, 0.4, 0.25, 0.05};
867 float stepEta = 0.001;
869 nBin = (int)(1+etaMax/stepEta);
870 sizeHCS = etaBin*sizeof(float);
872 memset ((void *)hcsFilt, 0, sizeHCS);
874 for (nx = 0; nx < nBin; nx++) {
875 for (i = 0; i < 5; i++) {
877 if (nxDx> -1 && nxDx<nBin)
878 hcsFilt[nx] += hcs[nxDx] * k[i];
882 for (nx = 0; nx < nBin; nx++) {
883 hcs[nx] = hcsFilt[nx];
887 /*void AliRICHPatRec::CerenkovRingDrawing()
890 //to draw Cherenkov ring by known Cherenkov angle
895 Float_t nfreonave, nquartzave;
898 Float_t e1, e2, f1, f2;
901 //parameters to calculate freon window refractive index vs. energy
906 //parameters to calculate quartz window refractive index vs. energy
918 for (Nphpad=0; Nphpad<nmaxdegrees;Nphpad++) {
920 phpad = (360./(Float_t)nmaxdegrees)*(Float_t)Nphpad;
922 aveEnerg = (energy[0]+energy[1])/2.;
924 nfreonave = a+b*aveEnerg;
925 nquartzave = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(aveEnerg,2)))+
926 (f2/(TMath::Power(e2,2)-TMath::Power(aveEnerg,2))));
928 bandradius = DistanceFromMip(nfreonave, nquartzave,
929 fEmissPoint,fThetaCerenkov, phpad);
931 fCoordEllipse[0][Nphpad] = fOnCathode[0];
932 fCoordEllipse[1][Nphpad] = fOnCathode[1];
933 printf(" values %f %f \n",fOnCathode[0],fOnCathode[1]);