RICH/AliRICHDetect.cxx

   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 #include <stdlib.h>
  19
  20
  21 #include "AliRICH.h"
  22 #include "AliRICHPoints.h"
  23 #include "AliRICHDetect.h"
  24 #include "AliRICHDigit.h"
  25 #include "AliRICHRawCluster.h"
  26 #include "AliRICHSegmentationV0.h"
  27 #include "AliRun.h"
  28 #include "TParticle.h"
  29 #include "TTree.h"
  30 #include "TMath.h"
  31 #include "TRandom.h"
  32 #include "TH3.h"
  33 #include "TH2.h"
  34 #include "TCanvas.h"
  35 #include <TStyle.h>
  36
  37
  38
  39 ClassImp(AliRICHDetect)
  40 //___________________________________________
  41 AliRICHDetect::AliRICHDetect() : TObject()
  42 {
  43
  44 // Default constructor
  45
  46   fc1 = 0;
  47   fc2 = 0;
  48   fc3 = 0;
  49
  50 }
  51
  52 //___________________________________________
  53 AliRICHDetect::AliRICHDetect(const char *name, const char *title)
  54     : TObject()
  55 {
  56
  57   TStyle *mystyle=new TStyle("Plain","mystyle");
  58   mystyle->SetPalette(1,0);
  59   mystyle->cd();
  60
  61
  62   fc1= new TCanvas("c1","Reconstructed points",50,50,300,350);
  63   fc1->Divide(2,2);
  64   fc2= new TCanvas("c2","Reconstructed points after SPOT",370,50,300,350);
  65   fc2->Divide(2,2);
  66   fc3= new TCanvas("c3","Used Digits",690,50,300,350);
  67   fc4= new TCanvas("c4","Mesh activation data",50,430,600,350);
  68   fc4->Divide(2,1);
  69
  70
  71 }
  72
  73 //___________________________________________
  74 AliRICHDetect::~AliRICHDetect()
  75 {
  76
  77 // Destructor
  78
  79 }
  80
  81
  82 void AliRICHDetect::Detect(Int_t nev, Int_t type)
  83 {
  84
  85 //
  86 // Detection algorithm
  87
  88
  89   //printf("Detection started!\n");
  90   Float_t omega,omega1,theta1,phi_relative,steptheta,stepphi,x,y,q=0,z,cx,cy,l,aux1,aux2,aux3,max,radius=0,meanradius=0;
  91   Int_t maxi,maxj,maxk;
  92   Float_t originalOmega, originalPhi, originalTheta;
  93   Float_t binomega, bintheta, binphi;
  94   Int_t intomega, inttheta, intphi;
  95   Int_t i,j,k;
  96
  97   AliRICH *pRICH  = (AliRICH*)gAlice->GetDetector("RICH");
  98   AliRICHSegmentationV0*  segmentation;
  99   AliRICHChamber*       iChamber;
 100   AliRICHGeometry*  geometry;
 101
 102   iChamber = &(pRICH->Chamber(0));
 103   segmentation=(AliRICHSegmentationV0*) iChamber->GetSegmentationModel(0);
 104   geometry=iChamber->GetGeometryModel();
 105
 106
 107   //const Float_t Noise_Level=0;                       //Noise Level in percentage of mesh points
 108   //const Float_t t=0.6;                               //Softening of Noise Correction (factor)
 109
 110   const Float_t kPi=TMath::Pi();
 111
 112   const Float_t kHeight=geometry->GetRadiatorToPads(); //Distance from Radiator to Pads in centimeters
 113   //printf("Distance to Pads:%f\n",kHeight);
 114
 115   const Int_t kSpot=0;                                 //number of passes with spot algorithm
 116
 117   const Int_t kDimensionTheta=100;                     //Matrix dimension for angle Detection
 118   const Int_t kDimensionPhi=100;
 119   const Int_t kDimensionOmega=100;
 120
 121   const Float_t SPOTp=.25;                            //Percentage of spot action
 122   const Float_t kMinOmega=.4;
 123   const Float_t kMaxOmega=.7;                 //Maximum Cherenkov angle to identify
 124   const Float_t kMinTheta=0;
 125   const Float_t kMaxTheta=10*kPi/180;
 126   const Float_t kMinPhi=0;
 127   const Float_t kMaxPhi=360*kPi/180;
 128
 129   Float_t rechit[6];                                 //Reconstructed point data
 130
 131   Int_t ***point = i3tensor(0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 132   Int_t ***point1 = i3tensor(0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 133
 134   steptheta=(kMaxTheta-kMinTheta)/kDimensionTheta;
 135   stepphi=(kMaxPhi-kMinPhi)/kDimensionPhi;
 136
 137   static TH3F *Points = new TH3F("Points","Reconstructed points 3D",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 138   static TH2F *ThetaPhi = new TH2F("ThetaPhi","Theta-Phi projection",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi);
 139   static TH2F *OmegaTheta = new TH2F("OmegaTheta","Omega-Theta projection",kDimensionTheta,0,kDimensionTheta,kDimensionOmega,0,kDimensionOmega);
 140   static TH2F *OmegaPhi = new TH2F("OmegaPhi","Omega-Phi projection",kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 141   static TH3F *SpotPoints = new TH3F("Points","Reconstructed points 3D, spot",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 142   static TH2F *SpotThetaPhi = new TH2F("ThetaPhi","Theta-Phi projection, spot",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi);
 143   static TH2F *SpotOmegaTheta = new TH2F("OmegaTheta","Omega-Theta projection, spot",kDimensionTheta,0,kDimensionTheta,kDimensionOmega,0,kDimensionOmega);
 144   static TH2F *SpotOmegaPhi = new TH2F("OmegaPhi","Omega-Phi projection, spot",kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 145   static TH2F *DigitsXY = new TH2F("DigitsXY","Pads used for reconstruction",150,-25,25,150,-25,25);
 146   static TH1F *AngleAct = new TH1F("AngleAct","Activation per angle",100,.45,1);
 147   static TH1F *Activation = new TH1F("Activation","Activation per ring",100,0,25);
 148   Points->SetXTitle("theta");
 149   Points->SetYTitle("phi");
 150   Points->SetZTitle("omega");
 151   ThetaPhi->SetXTitle("theta");
 152   ThetaPhi->SetYTitle("phi");
 153   OmegaTheta->SetXTitle("theta");
 154   OmegaTheta->SetYTitle("omega");
 155   OmegaPhi->SetXTitle("phi");
 156   OmegaPhi->SetYTitle("omega");
 157   SpotPoints->SetXTitle("theta");
 158   SpotPoints->SetYTitle("phi");
 159   SpotPoints->SetZTitle("omega");
 160   SpotThetaPhi->SetXTitle("theta");
 161   SpotThetaPhi->SetYTitle("phi");
 162   SpotOmegaTheta->SetXTitle("theta");
 163   SpotOmegaTheta->SetYTitle("omega");
 164   SpotOmegaPhi->SetXTitle("phi");
 165   SpotOmegaPhi->SetYTitle("omega");
 166   AngleAct->SetFillColor(5);
 167   AngleAct->SetXTitle("rad");
 168   AngleAct->SetYTitle("activation");
 169   Activation->SetFillColor(5);
 170   Activation->SetXTitle("activation");
 171
 172   Int_t ntracks = (Int_t)pRICH->TreeH()->GetEntries();
 173
 174   Float_t trackglob[3];
 175   Float_t trackloc[3];
 176
 177   //printf("Area de uma elipse com teta 0 e Omega 45:%f",Area(0,45));
 178
 179   Int_t track;
 180
 181   for (track=0; track<ntracks;track++) {
 182     gAlice->ResetHits();
 183     pRICH->TreeH()->GetEvent(track);
 184     TClonesArray *pHits  = pRICH->Hits();
 185     if (pHits == 0) return;
 186     Int_t nhits = pHits->GetEntriesFast();
 187     if (nhits == 0) continue;
 188     //Int_t nent=(Int_t)gAlice->TreeD()->GetEntries();
 189     AliRICHhit *mHit = 0;
 190     //Int_t npoints=0;
 191
 192     Int_t counter=0, counter1=0;
 193     //Initialization
 194     for(i=0;i<kDimensionTheta;i++)
 195       {
 196         for(j=0;j<kDimensionPhi;j++)
 197           {
 198             for(k=0;k<kDimensionOmega;k++)
 199               {
 200                 counter++;
 201                 point[i][j][k]=0;
 202                 //printf("Dimensions theta:%d, phi:%d, omega:%d",kDimensionTheta,kDimensionPhi,kDimensionOmega);
 203                 //printf("Resetting %d %d %d, time %d\n",i,j,k,counter);
 204                 //-Noise_Level*(Area(i*kPi/(18*dimension),k*kMaxOmega/dimension)-Area((i-1)*kPi/(18*dimension),(k-1)*kMaxOmega/dimension));
 205                 //printf("n-%f",-Noise_Level*(Area(i*kPi/(18*dimension),k*kMaxOmega/dimension)-Area((i-1)*kPi/(18*dimension),(k-1)*kMaxOmega/dimension)));
 206               }
 207           }
 208       }
 209
 210     Int_t ncerenkovs = pRICH->Cerenkovs()->GetEntriesFast();
 211
 212
 213     originalOmega = 0;
 214     counter = 0;
 215
 216     for (Int_t hit=0;hit<ncerenkovs;hit++) {
 217       AliRICHCerenkov* cHit = (AliRICHCerenkov*) pRICH->Cerenkovs()->UncheckedAt(hit);
 218       Float_t loss = cHit->fLoss;                 //did it hit the CsI?
 219       Float_t production = cHit->fProduction;     //was it produced in freon?
 220       Float_t cherenkov = cHit->fCerenkovAngle;   //production cerenkov angle
 221       if (loss == 4 && production == 1)
 222         {
 223           counter +=1;
 224           originalOmega += cherenkov;
 225           //printf("%f\n",cherenkov);
 226         }
 227     }
 228
 229     printf("Cerenkovs       : %d\n",counter);
 230
 231     if(counter != 0)    //if there are cerenkovs
 232       {
 233         originalOmega = originalOmega/counter;
 234         printf("Original omega: %f\n",originalOmega);
 235
 236
 237
 238         mHit = (AliRICHhit*) pHits->UncheckedAt(0);
 239         Int_t nch  = mHit->Chamber();
 240         originalTheta = mHit->Theta();
 241         originalPhi = mHit->Phi();
 242         trackglob[0] = mHit->X();
 243         trackglob[1] = mHit->Y();
 244         trackglob[2] = mHit->Z();
 245
 246         printf("\n--------------------------------------\n");
 247         printf("Chamber %d, track %d\n", nch, track);
 248
 249
 250         iChamber = &(pRICH->Chamber(nch-1));
 251
 252         //printf("Nch:%d\n",nch);
 253
 254         iChamber->GlobaltoLocal(trackglob,trackloc);
 255
 256         iChamber->LocaltoGlobal(trackloc,trackglob);
 257
 258
 259         cx=trackloc[0];
 260         cy=trackloc[2];
 261
 262         AliRICHDigit *points = 0;
 263         TClonesArray *pDigits = pRICH->DigitsAddress(nch-1);
 264
 265         AliRICHRawCluster *cluster =0;
 266         TClonesArray *pClusters = pRICH->RawClustAddress(nch-1);
 267
 268         Int_t maxcycle=0;
 269
 270         //digitize from digits
 271
 272         if(type==0)
 273           {
 274             gAlice->TreeD()->GetEvent(0);
 275             Int_t ndigits = pDigits->GetEntriesFast();
 276             maxcycle=ndigits;
 277             printf("Got %d digits\n",ndigits);
 278           }
 279
 280         //digitize from clusters
 281
 282         if(type==1)
 283           {
 284             Int_t nent=(Int_t)gAlice->TreeR()->GetEntries();
 285             gAlice->TreeR()->GetEvent(nent-1);
 286             Int_t nclusters = pClusters->GetEntriesFast();
 287             maxcycle=nclusters;
 288             printf("Got %d clusters\n",nclusters);
 289           }
 290
 291
 292
 293
 294         counter=0;
 295         printf("Starting calculations\n");
 296         printf("           Start                                                                                              Finish\n");
 297         printf("Progress:     ");
 298         for(Float_t theta=0;theta<kMaxTheta;theta+=steptheta)
 299           {
 300             printf(".");
 301             for(Float_t phi=0;phi<=kMaxPhi;phi+=stepphi)
 302               {
 303                 //printf("Phi:%3.1f\n", phi*180/kPi);
 304                 counter1=0;
 305                 for (Int_t cycle=0;cycle<maxcycle;cycle++)
 306                   {
 307
 308                     if(type==0)
 309                       {
 310                         points=(AliRICHDigit*) pDigits->UncheckedAt(cycle);
 311                         segmentation->GetPadC(points->PadX(), points->PadY(),x, y, z);
 312                       }
 313
 314                     if(type==1)
 315                       {
 316                         cluster=(AliRICHRawCluster*) pClusters->UncheckedAt(cycle);
 317                         x=cluster->fX;
 318                         y=cluster->fY;
 319                         q=cluster->fQ;
 320                       }
 321
 322                     if(type ==0 || q > 100)
 323
 324                       {
 325
 326                         x=x-cx;
 327                         y=y-cy;
 328                         radius=TMath::Sqrt(TMath::Power(x,2)+TMath::Power(y,2));
 329
 330                         //calculation of relative phi angle of digit
 331
 332                         phi_relative = acos(y/radius);
 333                         phi_relative = TMath::Abs(phi_relative - phi);
 334
 335
 336                         if(radius>4)
 337                           {
 338                             meanradius+=radius;
 339                             counter++;
 340
 341
 342                             //if (radius < (2*kHeight*tan(theta+kMaxOmega)))
 343                             if (radius < (2*kHeight*tan(kMaxOmega)))
 344                               //if(Fiducial(x,y,theta,phi,kHeight,kMaxOmega,kMinOmega))
 345                               {
 346
 347                                 if(phi==0)
 348                                   {
 349                                 //printf("Radius: %f, Max Radius: %f\n",radius,2*kHeight*tan(theta+kMaxOmega)*3/4);
 350                                 //printf("Loaded digit %d with coordinates x:%f, y%f\n",dig,x,y);
 351                                 //printf("Using digit %d, for theta %f\n",dig,theta);
 352                                   }
 353
 354                                 counter1++;
 355
 356                                 l=kHeight/cos(theta);
 357
 358                                 //main calculation
 359
 360                                 DigitsXY->Fill(x,y,(float) 1);
 361
 362                                 theta1=SnellAngle(theta);
 363
 364                                 aux1=-y*sin(phi)+x*cos(phi);
 365                                 aux2=y*cos(phi)+x*sin(phi);
 366                                 aux3=( TMath::Power(aux1,2)+TMath::Power(cos(theta1)*aux2 ,2))/TMath::Power(sin(theta1)*aux2+l,2);
 367                                 omega=atan(sqrt(aux3));
 368
 369                                 //omega is distorted, theta1 is distorted
 370
 371                                 if(InvSnellAngle(omega+TMath::Abs(cos(phi_relative))*theta1)<999)
 372                                   {
 373                                     omega1=InvSnellAngle(omega+TMath::Abs(cos(phi_relative))*theta);
 374                                     theta1=InvSnellAngle(theta1);
 375
 376                                   }
 377                                 else
 378                                   {
 379                                     omega1=0;
 380                                     theta1=0;
 381                                   }
 382
 383                                 if(omega1<kMaxOmega && omega1>kMinOmega)
 384                                   {
 385                                 //printf("Omega found:%f\n",omega);
 386                                     omega1=omega1-kMinOmega;
 387
 388                                 //printf("Omega: %f Theta: %3.1f Phi:%3.1f\n",omega, theta*180/kPi, phi*180/kPi);
 389
 390                                     bintheta=theta1*kDimensionTheta/kMaxTheta;
 391                                     binphi=phi*kDimensionPhi/kMaxPhi;
 392                                     binomega=omega1*kDimensionOmega/(kMaxOmega-kMinOmega);
 393
 394                                     if(Int_t(bintheta+0.5)==Int_t(bintheta))
 395                                       inttheta=Int_t(bintheta);
 396                                     else
 397                                       inttheta=Int_t(bintheta+0.5);
 398
 399                                     if(Int_t(binomega+0.5)==Int_t(binomega))
 400                                       intomega=Int_t(binomega);
 401                                     else
 402                                       intomega=Int_t(binomega+0.5);
 403
 404                                     if(Int_t(binphi+0.5)==Int_t(binphi))
 405                                       intphi=Int_t(binphi);
 406                                     else
 407                                       intphi=Int_t(binphi+0.5);
 408
 409                                 //printf("Point added at %d %d %d\n",inttheta,intphi,intomega);
 410
 411                                     if(type==0)
 412                                       point[inttheta][intphi][intomega]+=1;
 413                                     if(type==1)
 414                                       point[inttheta][intphi][intomega]+=(Int_t)(q);
 415
 416                                 //printf("Omega stored:%d\n",intomega);
 417                                     Points->Fill(inttheta,intphi,intomega,(float) 1);
 418                                     ThetaPhi->Fill(inttheta,intphi,(float) 1);
 419                                     OmegaTheta->Fill(inttheta,intomega,(float) 1);
 420                                     OmegaPhi->Fill(intphi,intomega,(float) 1);
 421                                 //printf("Filling at %d %d %d\n",Int_t(theta*kDimensionTheta/kMaxTheta),Int_t(phi*kDimensionPhi/kMaxPhi),Int_t(omega*kDimensionOmega/kMaxOmega));
 422                                   }
 423                                 //if(omega<kMaxOmega)point[Int_t(theta)][Int_t(phi)][Int_t(omega)]+=1;
 424                               }
 425                           }
 426                       }
 427
 428                   }
 429                 //printf("Used %d digits for theta %3.1f\n",counter1, theta*180/kPi);
 430               }
 431
 432           }
 433
 434         printf("\n");
 435
 436         meanradius=meanradius/counter;
 437         //printf("Mean radius:%f, counter:%d\n",meanradius,counter);
 438         rechit[5]=meanradius;
 439         //printf("Used %d digits\n",counter1);
 440         //printf("\n");
 441
 442         if(nev<2)
 443           {
 444             if(nev==0)
 445               {
 446                 fc1->cd(1);
 447                 Points->Draw("colz");
 448                 fc1->cd(2);
 449                 ThetaPhi->Draw("colz");
 450                 fc1->cd(3);
 451                 OmegaTheta->Draw("colz");
 452                 fc1->cd(4);
 453                 OmegaPhi->Draw("colz");
 454                 fc3->cd();
 455                 DigitsXY->Draw("colz");
 456               }
 457             else
 458               {
 459                 //fc1->cd(1);
 460                 //Points->Draw("same");
 461                 //fc1->cd(2);
 462                 //ThetaPhi->Draw("same");
 463                 //fc1->cd(3);
 464                 //OmegaTheta->Draw("same");
 465                 //fc1->cd(4);
 466                 //OmegaPhi->Draw("same");
 467               }
 468           }
 469
 470
 471         //SPOT execute twice
 472         for(Int_t s=0;s<kSpot;s++)
 473           {
 474             printf("     Applying Spot algorithm, pass %d\n", s);
 475
 476         //buffer copy
 477         for(i=0;i<=kDimensionTheta;i++)
 478           {
 479             for(j=0;j<=kDimensionPhi;j++)
 480               {
 481                 for(k=0;k<=kDimensionOmega;k++)
 482                   {
 483                     point1[i][j][k]=point[i][j][k];
 484                   }
 485               }
 486           }
 487
 488         //SPOT algorithm
 489         for(i=1;i<kDimensionTheta-1;i++)
 490           {
 491             for(j=1;j<kDimensionPhi-1;j++)
 492               {
 493                 for(k=1;k<kDimensionOmega-1;k++)
 494                   {
 495                     if((point[i][k][j]>point[i-1][k][j])&&(point[i][k][j]>point[i+1][k][j])&&
 496                        (point[i][k][j]>point[i][k-1][j])&&(point[i][k][j]>point[i][k+1][j])&&
 497                        (point[i][k][j]>point[i][k][j-1])&&(point[i][k][j]>point[i][k][j+1]))
 498                       {
 499                         //cout<<"SPOT"<<endl;
 500                         //Execute SPOT on point
 501                         point1[i][j][k]+=Int_t(SPOTp*(point[i-1][k][j]+point[i+1][k][j]+point[i][k-1][j]+point[i][k+1][j]+point[i][k][j-1]+point[i][k][j+1]));
 502                         point1[i-1][k][j]=Int_t(SPOTp*point[i-1][k][j]);
 503                         point1[i+1][k][j]=Int_t(SPOTp*point[i+1][k][j]);
 504                         point1[i][k-1][j]=Int_t(SPOTp*point[i][k-1][j]);
 505                         point1[i][k+1][j]=Int_t(SPOTp*point[i][k+1][j]);
 506                         point1[i][k][j-1]=Int_t(SPOTp*point[i][k][j-1]);
 507                         point1[i][k][j+1]=Int_t(SPOTp*point[i][k][j+1]);
 508                       }
 509                   }
 510               }
 511           }
 512
 513         //copy from buffer copy
 514         counter1=0;
 515         for(i=1;i<kDimensionTheta;i++)
 516           {
 517             for(j=1;j<kDimensionPhi;j++)
 518               {
 519                 for(k=1;k<kDimensionOmega;k++)
 520                   {
 521                     point[i][j][k]=point1[i][j][k];
 522                     if(nev<20)
 523                       {
 524                         if(s==kSpot-1)
 525                           {
 526                             if(point1[i][j][k] != 0)
 527                               {
 528                                 SpotPoints->Fill(i,j,k,(float) point1[i][j][k]);
 529                                 //printf("Random number %f\n",random->Rndm(2));
 530                                 //if(random->Rndm() < .2)
 531                                   //{
 532                                 SpotThetaPhi->Fill(i,j,(float) point1[i][j][k]);
 533                                 SpotOmegaTheta->Fill(i,k,(float) point1[i][j][k]);
 534                                 SpotOmegaPhi->Fill(j,k,(float) point1[i][j][k]);
 535                                     counter1++;
 536                                   //}
 537                                 //printf("Filling at %d %d %d value %f\n",i,j,k,(float) point1[i][j][k]);
 538                               }
 539                           }
 540                       }
 541                     //if(point1[i][j][k] != 0)
 542                       //printf("Last transfer point: %d, point1, %d\n",point[i][j][k],point1[i][j][k]);
 543                   }
 544               }
 545           }
 546       }
 547
 548     //printf("Filled %d cells\n",counter1);
 549
 550         if(nev<2)
 551           {
 552             if(nev==0)
 553               {
 554                 fc2->cd(1);
 555                 SpotPoints->Draw("colz");
 556                 fc2->cd(2);
 557                 SpotThetaPhi->Draw("colz");
 558                 fc2->cd(3);
 559                 SpotOmegaTheta->Draw("colz");
 560                 fc2->cd(4);
 561                 SpotOmegaPhi->Draw("colz");
 562               }
 563             else
 564               {
 565                 //fc2->cd(1);
 566                 //SpotPoints->Draw("same");
 567                 //fc2->cd(2);
 568                 //SpotThetaPhi->Draw("same");
 569                 //fc2->cd(3);
 570                 //SpotOmegaTheta->Draw("same");
 571                 //fc2->cd(4);
 572                 //SpotOmegaPhi->Draw("same");
 573               }
 574           }
 575
 576
 577         //Identification is equivalent to maximum determination
 578         max=0;maxi=0;maxj=0;maxk=0;
 579
 580         printf("     Proceeding to identification");
 581
 582         for(i=0;i<kDimensionTheta;i++)
 583           for(j=0;j<kDimensionPhi;j++)
 584             for(k=0;k<kDimensionOmega;k++)
 585               if(point[i][j][k]>max)
 586                 {
 587                   //cout<<"maxi="<<i*90/dimension<<" maxj="<<j*90/dimension<<" maxk="<<k*kMaxOmega/dimension*180/kPi<<" max="<<max<<endl;
 588                 maxi=i;maxj=j;maxk=k;
 589                 max=point[i][j][k];
 590                 printf(".");
 591                 //printf("Max Omega %d, Max Theta %d, Max Phi %d (%d counts)\n",maxk,maxi,maxj,max);
 592                 }
 593         printf("\n");
 594
 595         Float_t FinalOmega = maxk*(kMaxOmega-kMinOmega)/kDimensionOmega;
 596         Float_t FinalTheta = maxi*kMaxTheta/kDimensionTheta;
 597         Float_t FinalPhi = maxj*kMaxPhi/kDimensionPhi;
 598
 599         FinalOmega += kMinOmega;
 600
 601         //printf("Detected angle for height %3.1f and for center %3.1f %3.1f:%f\n",h,cx,cy,maxk*kPi/(kDimensionTheta*4));
 602         printf("     Indentified angles: cerenkov - %f, theta - %3.1f, phi - %3.1f (%f activation)\n", FinalOmega, FinalTheta*180/kPi, FinalPhi*180/kPi, max);
 603         //printf("Detected angle for height %3.1f and for center %3.1f %3.1f:%f\n",kHeight,cx,cy,maxk);
 604
 605         AngleAct->Fill(FinalOmega, (float) max);
 606         Activation->Fill(max, (float) 1);
 607
 608         if(nev==0)
 609               {
 610                 fc4->cd(1);
 611                 AngleAct->Draw();
 612                 fc4->cd(2);
 613                 Activation->Draw();
 614               }
 615             else
 616               {
 617                 fc4->cd(1);
 618                 AngleAct->Draw("same");
 619                 fc4->cd(2);
 620                 Activation->Draw("same");
 621               }
 622
 623
 624         //fscanf(omegas,"%f",&realomega);
 625         //fscanf(thetas,"%f",&realtheta);
 626         //printf("Real Omega: %f",realomega);
 627         //cout<<"Detected:theta="<<maxi*90/kDimensionTheta<<"phi="<<maxj*90/kDimensionPhi<<"omega="<<maxk*kMaxOmega/kDimensionOmega*180/kPi<<" OmegaError="<<fabs(maxk*kMaxOmega/kDimensionOmega*180/kPi-realomega)<<" ThetaError="<<fabs(maxi*90/kDimensionTheta-realtheta)<<endl<<endl;
 628
 629         //fprintf(results,"Center Coordinates, cx=%6.2f cy=%6.2f, Real Omega=%6.2f, Detected Omega=%6.2f, Omega Error=%6.2f Theta Error=%6.2f\n",cx,cy,realomega,maxk*kMaxOmega/kDimensionOmega*180/kPi,fabs(maxk*kMaxOmega/kDimensionOmega*180/kPi-realomega),fabs(maxi*90/kDimensionTheta-realtheta));
 630
 631     /*for(j=0;j<np;j++)
 632       pointpp(maxj*90/kDimensionTheta,maxi*90/kDimensionPhi,maxk*kMaxOmega/kDimensionOmega*180/kPi,cx,cy);//Generates a point on the elipse*/
 633
 634
 635     //Start filling rec. hits
 636
 637     rechit[0] = FinalTheta;
 638     rechit[1] = FinalPhi - 90*kPi/180;
 639     rechit[2] = FinalOmega;
 640     rechit[3] = cx;
 641     rechit[4] = cy;
 642
 643     //CreatePoints(FinalTheta, 270*kPi/180 + FinalPhi, FinalOmega, kHeight);
 644
 645     printf ("track %d, theta %f, phi %f, omega %f\n\n\n",track,rechit[0],rechit[1]*180/kPi,rechit[2]);
 646
 647     // fill rechits
 648     pRICH->AddRecHit3D(nch-1,rechit,originalOmega, originalTheta, originalPhi);
 649     //printf("rechit %f %f %f %f %f\n",rechit[0],rechit[1],rechit[2],rechit[3],rechit[4]);
 650     //printf("Chamber:%d",nch);
 651       }
 652
 653     else   //if no cerenkovs
 654
 655       {
 656
 657         rechit[0] = 0;
 658         rechit[1] = 0;
 659         rechit[2] = 0;
 660         rechit[3] = 0;
 661         rechit[4] = 0;
 662
 663       }
 664
 665   }
 666
 667   if(type==1)  //reco from clusters
 668     {
 669       pRICH->ResetRawClusters();
 670       //Int_t nent=(Int_t)gAlice->TreeR()->GetEntries();
 671       //gAlice->TreeR()->GetEvent(track);
 672       //printf("Going to branch %d\n",track);
 673       //gAlice->GetEvent(nev);
 674     }
 675
 676
 677     //printf("\n\n\n\n");
 678     gAlice->TreeR()->Fill();
 679   TClonesArray *fRec;
 680   for (i=0;i<kNCH;i++) {
 681     fRec=pRICH->RecHitsAddress3D(i);
 682     int ndig=fRec->GetEntriesFast();
 683     printf ("Chamber %d, rings %d\n",i+1,ndig);
 684   }
 685   pRICH->ResetRecHits3D();
 686
 687   free_i3tensor(point,0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 688   free_i3tensor(point1,0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 689 }
 690
 691
 692
 693 Float_t AliRICHDetect:: Area(Float_t theta,Float_t omega)
 694 {
 695
 696 //
 697 // Calculates area of an ellipse for given incidence angles
 698
 699
 700     Float_t area;
 701     const Float_t kHeight=9.25;                       //Distance from Radiator to Pads in pads
 702
 703     area=TMath::Pi()*TMath::Power(kHeight*tan(omega),2)/TMath::Power(TMath::Power(cos(theta),2)-TMath::Power(tan(omega)*sin(theta),2),3/2);
 704
 705     return (area);
 706 }
 707
 708
 709 Int_t ***AliRICHDetect::i3tensor(long nrl, long nrh, long ncl, long nch, long ndl, long ndh)
 710 // allocate a Int_t 3tensor with range t[nrl..nrh][ncl..nch][ndl..ndh]
 711 {
 712   long i,j,nrow=nrh-nrl+1,ncol=nch-ncl+1,ndep=ndh-ndl+1;
 713   Int_t ***t;
 714
 715   int NR_END=1;
 716
 717   // allocate pointers to pointers to rows
 718   t=(Int_t ***) malloc((size_t)((nrow+NR_END)*sizeof(Int_t**)));
 719   if (!t) printf("allocation failure 1 in f3tensor()");
 720   t += NR_END;
 721   t -= nrl;
 722
 723   // allocate pointers to rows and set pointers to them
 724   t[nrl]=(Int_t **) malloc((size_t)((nrow*ncol+NR_END)*sizeof(Int_t*)));
 725   if (!t[nrl]) printf("allocation failure 2 in f3tensor()");
 726   t[nrl] += NR_END;
 727   t[nrl] -= ncl;
 728
 729   // allocate rows and set pointers to them
 730   t[nrl][ncl]=(Int_t *) malloc((size_t)((nrow*ncol*ndep+NR_END)*sizeof(Int_t)));
 731   if (!t[nrl][ncl]) printf("allocation failure 3 in f3tensor()");
 732   t[nrl][ncl] += NR_END;
 733   t[nrl][ncl] -= ndl;
 734
 735   for(j=ncl+1;j<=nch;j++) t[nrl][j]=t[nrl][j-1]+ndep;
 736   for(i=nrl+1;i<=nrh;i++) {
 737     t[i]=t[i-1]+ncol;
 738     t[i][ncl]=t[i-1][ncl]+ncol*ndep;
 739     for(j=ncl+1;j<=nch;j++) t[i][j]=t[i][j-1]+ndep;
 740   }
 741
 742   // return pointer to array of pointers to rows
 743   return t;
 744 }
 745
 746 void AliRICHDetect::free_i3tensor(int ***t, long nrl, long nrh, long ncl, long nch,long ndl, long ndh)
 747 // free a Int_t f3tensor allocated by i3tensor()
 748 {
 749   int NR_END=1;
 750
 751   free((char*) (t[nrl][ncl]+ndl-NR_END));
 752   free((char*) (t[nrl]+ncl-NR_END));
 753   free((char*) (t+nrl-NR_END));
 754 }
 755
 756
 757 Float_t AliRICHDetect:: SnellAngle(Float_t iangle)
 758 {
 759
 760 // Compute the Snell angle
 761
 762   Float_t nfreon  = 1.295;
 763   Float_t nquartz = 1.585;
 764   Float_t ngas = 1;
 765
 766   Float_t sinrangle;
 767   Float_t rangle;
 768   Float_t a1, a2;
 769
 770   a1=nfreon/nquartz;
 771   a2=nquartz/ngas;
 772
 773   sinrangle = a1*a2*sin(iangle);
 774
 775   if(sinrangle>1.) {
 776      rangle = 999.;
 777      return rangle;
 778   }
 779
 780   rangle = asin(sinrangle);
 781   return rangle;
 782 }
 783
 784 Float_t AliRICHDetect:: InvSnellAngle(Float_t rangle)
 785 {
 786
 787 // Compute the inverse Snell angle
 788
 789   Float_t nfreon  = 1.295;
 790   Float_t nquartz = 1.585;
 791   Float_t ngas = 1;
 792
 793   Float_t siniangle;
 794   Float_t iangle;
 795   Float_t a1,a2;
 796
 797   a1=nfreon/nquartz;
 798   a2=nquartz/ngas;
 799
 800   siniangle = sin(rangle)/(a1*a2);
 801   iangle = asin(siniangle);
 802
 803   if(siniangle>1.) {
 804      iangle = 999.;
 805      return iangle;
 806   }
 807
 808   iangle = asin(siniangle);
 809   return iangle;
 810 }
 811
 812
 813
 814 //________________________________________________________________________________
 815 void AliRICHDetect::CreatePoints(Float_t theta, Float_t phi, Float_t omega, Float_t h)
 816 {
 817
 818   // Create points along the ellipse equation
 819
 820   Int_t s1,s2;
 821   Float_t fiducial=h*TMath::Tan(omega+theta), l=h/TMath::Cos(theta), xtrial, y=0, c0, c1, c2;
 822   //TRandom *random=new TRandom();
 823
 824   static TH2F *REllipse = new TH2F("REllipse","Reconstructed ellipses",150,-25,25,150,-25,25);
 825
 826   for(Float_t i=0;i<1000;i++)
 827     {
 828
 829       Float_t counter=0;
 830
 831       c0=0;c1=0;c2=0;
 832       while((c1*c1-4*c2*c0)<=0 && counter<1000)
 833         {
 834           //Choose which side to go...
 835           if(i>250 && i<750) s1=1;
 836           //if (gRandom->Rndm(1)>.5) s1=1;
 837           else s1=-1;
 838           //printf("s1:%d\n",s1);
 839           //Trial a y
 840           y=s1*i*gRandom->Rndm(Int_t(fiducial/50));
 841           //printf("Fiducial %f  for omega:%f theta:%f phi:%f\n",fiducial,omega,theta,fphi);
 842           Float_t alfa1=theta;
 843           Float_t theta1=phi;
 844           Float_t omega1=omega;
 845
 846           //Solve the eq for a trial x
 847           c0=-TMath::Power(y*TMath::Cos(alfa1)*TMath::Cos(theta1),2)-TMath::Power(y*TMath::Sin(alfa1),2)+TMath::Power(l*TMath::Tan(omega1),2)+2*l*y*TMath::Cos(alfa1)*TMath::Sin(theta1)*TMath::Power(TMath::Tan(omega1),2)+TMath::Power(y*TMath::Cos(alfa1)*TMath::Sin(theta1)*TMath::Tan(omega1),2);
 848           c1=2*y*TMath::Cos(alfa1)*TMath::Sin(alfa1)-2*y*TMath::Cos(alfa1)*TMath::Power(TMath::Cos(theta1),2)*TMath::Sin(alfa1)+2*l*TMath::Sin(alfa1)*TMath::Sin(theta1)*TMath::Power(TMath::Tan(omega1),2)+2*y*TMath::Cos(alfa1)*TMath::Sin(alfa1)*TMath::Power(TMath::Sin(theta1),2)*TMath::Power(TMath::Tan(omega1),2);
 849           c2=-TMath::Power(TMath::Cos(alfa1),2)-TMath::Power(TMath::Cos(theta1)*TMath::Sin(alfa1),2)+TMath::Power(TMath::Sin(alfa1)*TMath::Sin(theta1)*TMath::Tan(omega1),2);
 850           //cout<<"Trial: y="<<y<<"c0="<<c0<<" c1="<<c1<<" c2="<<c2<<endl;
 851           //printf("Result:%f\n\n",c1*c1-4*c2*c0);
 852           //i+=.01;
 853           counter +=1;
 854         }
 855
 856       if (counter>=1000)
 857         y=0;
 858
 859       //Choose which side to go...
 860       //if(gRandom->Rndm(1)>.5) s=1;
 861       //else s=-1;
 862       if(i>500) s2=1;
 863       //if (gRandom->Rndm(1)>.5) s2=1;
 864       else s2=-1;
 865       xtrial=(-c1+s2*TMath::Sqrt(c1*c1-4*c2*c0))/(2*c2);
 866       //cout<<"x="<<xtrial<<" y="<<cy+y<<endl;
 867       //printf("Coordinates: %f %f\n",xtrial,fCy+y);
 868
 869       REllipse->Fill(xtrial,y);
 870
 871       //printf("Coordinates: %f %f %f\n",vectorGlob[0],vectorGlob[1],vectorGlob[2]);
 872     }
 873
 874   fc3->cd(2);
 875   REllipse->Draw();
 876 }
 877
 878 Int_t AliRICHDetect::Fiducial(Float_t rotx, Float_t roty, Float_t theta, Float_t phi, Float_t height, Float_t maxOmega, Float_t minOmega)
 879 {
 880
 881   Float_t x,y,y1,h,omega1,omega2;
 882
 883   Float_t a,b, offset;
 884   Float_t a1,b1, offset1;
 885
 886   h = height;
 887
 888   //refraction calculation
 889
 890   theta = SnellAngle(theta);
 891   phi = phi - TMath::Pi();
 892   omega1 = SnellAngle(maxOmega);
 893   omega2 = SnellAngle(minOmega);
 894
 895   //maximum zone
 896   a = h*(tan(omega1+theta)+tan(omega1-theta))/2;
 897   b = h*tan(omega1);
 898
 899   offset = h*(tan(omega1+theta)-tan(omega1-theta))/2;
 900
 901
 902   //minimum zone
 903   a1 = h*(tan(omega2+theta)+tan(omega2-theta))/2;
 904   b1 = h*tan(omega2);
 905
 906   offset1 = h*(tan(omega2+theta)-tan(omega2-theta))/2;
 907
 908
 909   //rotation to phi=0
 910   x = rotx*cos(phi)+roty*sin(phi);
 911   y = -rotx*sin(phi)+roty*cos(phi) - offset;
 912   y1 = -rotx*sin(phi)+roty*cos(phi) - offset1;
 913
 914
 915   if(x*x/a+y*y/b<1 && x*x/a1+y1*y1/b1>1)
 916     return 1;
 917   else
 918     return 0;
 919
 920 }