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 /*
  17   $Log$
  18   Revision 1.16  2001/10/23 13:03:35  hristov
  19   The access to several data members was changed from public to protected. The digitisation was adapted to the multi-event case (J.Chudoba)
  20
  21   Revision 1.15  2001/10/21 18:31:23  hristov
  22   Several pointers were set to zero in the default constructors to avoid memory management problems
  23
  24   Revision 1.14  2001/05/14 13:25:54  hristov
  25   stdlib.h included (for Alpha)
  26
  27   Revision 1.13  2001/05/10 12:26:31  jbarbosa
  28   Totally reworked version of reconstruction algorithm.
  29
  30   Revision 1.12  2001/02/27 22:15:03  jbarbosa
  31   Removed compiler warning.
  32
  33   Revision 1.11  2001/02/27 15:21:46  jbarbosa
  34   Transition to SDigits.
  35
  36   Revision 1.10  2001/02/13 20:39:06  jbarbosa
  37   Changes to make it work with new IO.
  38
  39   Revision 1.9  2001/01/22 21:39:11  jbarbosa
  40   Several tune-ups
  41
  42   Revision 1.8  2000/11/15 15:52:53  jbarbosa
  43   Turned on spot algorithm.
  44
  45   Revision 1.7  2000/11/01 15:37:05  jbarbosa
  46   Updated to use its own rec. point object.
  47
  48   Revision 1.6  2000/10/02 21:28:12  fca
  49   Removal of useless dependecies via forward declarations
  50
  51   Revision 1.5  2000/06/30 16:30:28  dibari
  52   Disabled writing to rechits.
  53
  54   Revision 1.4  2000/06/15 15:46:59  jbarbosa
  55   Corrected compilation errors on HP-UX (replaced pow with TMath::Power)
  56
  57   Revision 1.3  2000/06/13 13:15:41  jbarbosa
  58   Still some code cleanup done (variable names)
  59
  60   Revision 1.2  2000/06/12 15:19:30  jbarbosa
  61   Cleaned up version.
  62
  63   Revision 1.1  2000/04/19 13:05:14  morsch
  64   J. Barbosa's spot reconstruction algorithm.
  65
  66 */
  67
  68 #include <stdlib.h>
  69
  70
  71 #include "AliRICH.h"
  72 #include "AliRICHPoints.h"
  73 #include "AliRICHDetect.h"
  74 #include "AliRICHHit.h"
  75 #include "AliRICHDigit.h"
  76 #include "AliRICHRawCluster.h"
  77 #include "AliRICHCerenkov.h"
  78 #include "AliRICHSegmentationV0.h"
  79 #include "AliRun.h"
  80 #include "TParticle.h"
  81 #include "TTree.h"
  82 #include "TMath.h"
  83 #include "TRandom.h"
  84 #include "TH3.h"
  85 #include "TH2.h"
  86 #include "TCanvas.h"
  87 #include <TStyle.h>
  88
  89
  90 #include "malloc.h"
  91
  92
  93 ClassImp(AliRICHDetect)
  94 //___________________________________________
  95 AliRICHDetect::AliRICHDetect() : TObject()
  96 {
  97
  98 // Default constructor
  99
 100   fc1 = 0;
 101   fc2 = 0;
 102   fc3 = 0;
 103
 104 }
 105
 106 //___________________________________________
 107 AliRICHDetect::AliRICHDetect(const char *name, const char *title)
 108     : TObject()
 109 {
 110
 111   TStyle *mystyle=new TStyle("Plain","mystyle");
 112   mystyle->SetPalette(1,0);
 113   mystyle->cd();
 114
 115
 116   fc1= new TCanvas("c1","Reconstructed points",50,50,300,350);
 117   fc1->Divide(2,2);
 118   fc2= new TCanvas("c2","Reconstructed points after SPOT",370,50,300,350);
 119   fc2->Divide(2,2);
 120   fc3= new TCanvas("c3","Used Digits",690,50,300,350);
 121   fc4= new TCanvas("c4","Mesh activation data",50,430,600,350);
 122   fc4->Divide(2,1);
 123
 124
 125 }
 126
 127 //___________________________________________
 128 AliRICHDetect::~AliRICHDetect()
 129 {
 130
 131 // Destructor
 132
 133 }
 134
 135
 136 void AliRICHDetect::Detect(Int_t nev, Int_t type)
 137 {
 138
 139 //
 140 // Detection algorithm
 141
 142
 143   //printf("Detection started!\n");
 144   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;
 145   Int_t maxi,maxj,maxk;
 146   Float_t originalOmega, originalPhi, originalTheta;
 147   Float_t binomega, bintheta, binphi;
 148   Int_t intomega, inttheta, intphi;
 149   Int_t i,j,k;
 150
 151   AliRICH *pRICH  = (AliRICH*)gAlice->GetDetector("RICH");
 152   AliRICHSegmentationV0*  segmentation;
 153   AliRICHChamber*       iChamber;
 154   AliRICHGeometry*  geometry;
 155
 156   iChamber = &(pRICH->Chamber(0));
 157   segmentation=(AliRICHSegmentationV0*) iChamber->GetSegmentationModel(0);
 158   geometry=iChamber->GetGeometryModel();
 159
 160
 161   //const Float_t Noise_Level=0;                       //Noise Level in percentage of mesh points
 162   //const Float_t t=0.6;                               //Softening of Noise Correction (factor)
 163
 164   const Float_t kPi=TMath::Pi();
 165
 166   const Float_t kHeight=geometry->GetRadiatorToPads(); //Distance from Radiator to Pads in centimeters
 167   //printf("Distance to Pads:%f\n",kHeight);
 168
 169   const Int_t kSpot=0;                                 //number of passes with spot algorithm
 170
 171   const Int_t kDimensionTheta=100;                     //Matrix dimension for angle Detection
 172   const Int_t kDimensionPhi=100;
 173   const Int_t kDimensionOmega=100;
 174
 175   const Float_t SPOTp=.25;                            //Percentage of spot action
 176   const Float_t kMinOmega=.4;
 177   const Float_t kMaxOmega=.7;                 //Maximum Cherenkov angle to identify
 178   const Float_t kMinTheta=0;
 179   const Float_t kMaxTheta=10*kPi/180;
 180   const Float_t kMinPhi=0;
 181   const Float_t kMaxPhi=360*kPi/180;
 182
 183   Float_t rechit[6];                                 //Reconstructed point data
 184
 185   Int_t ***point = i3tensor(0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 186   Int_t ***point1 = i3tensor(0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 187
 188   steptheta=(kMaxTheta-kMinTheta)/kDimensionTheta;
 189   stepphi=(kMaxPhi-kMinPhi)/kDimensionPhi;
 190
 191   static TH3F *Points = new TH3F("Points","Reconstructed points 3D",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 192   static TH2F *ThetaPhi = new TH2F("ThetaPhi","Theta-Phi projection",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi);
 193   static TH2F *OmegaTheta = new TH2F("OmegaTheta","Omega-Theta projection",kDimensionTheta,0,kDimensionTheta,kDimensionOmega,0,kDimensionOmega);
 194   static TH2F *OmegaPhi = new TH2F("OmegaPhi","Omega-Phi projection",kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 195   static TH3F *SpotPoints = new TH3F("Points","Reconstructed points 3D, spot",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 196   static TH2F *SpotThetaPhi = new TH2F("ThetaPhi","Theta-Phi projection, spot",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi);
 197   static TH2F *SpotOmegaTheta = new TH2F("OmegaTheta","Omega-Theta projection, spot",kDimensionTheta,0,kDimensionTheta,kDimensionOmega,0,kDimensionOmega);
 198   static TH2F *SpotOmegaPhi = new TH2F("OmegaPhi","Omega-Phi projection, spot",kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 199   static TH2F *DigitsXY = new TH2F("DigitsXY","Pads used for reconstruction",150,-25,25,150,-25,25);
 200   static TH1F *AngleAct = new TH1F("AngleAct","Activation per angle",100,.45,1);
 201   static TH1F *Activation = new TH1F("Activation","Activation per ring",100,0,25);
 202   Points->SetXTitle("theta");
 203   Points->SetYTitle("phi");
 204   Points->SetZTitle("omega");
 205   ThetaPhi->SetXTitle("theta");
 206   ThetaPhi->SetYTitle("phi");
 207   OmegaTheta->SetXTitle("theta");
 208   OmegaTheta->SetYTitle("omega");
 209   OmegaPhi->SetXTitle("phi");
 210   OmegaPhi->SetYTitle("omega");
 211   SpotPoints->SetXTitle("theta");
 212   SpotPoints->SetYTitle("phi");
 213   SpotPoints->SetZTitle("omega");
 214   SpotThetaPhi->SetXTitle("theta");
 215   SpotThetaPhi->SetYTitle("phi");
 216   SpotOmegaTheta->SetXTitle("theta");
 217   SpotOmegaTheta->SetYTitle("omega");
 218   SpotOmegaPhi->SetXTitle("phi");
 219   SpotOmegaPhi->SetYTitle("omega");
 220   AngleAct->SetFillColor(5);
 221   AngleAct->SetXTitle("rad");
 222   AngleAct->SetYTitle("activation");
 223   Activation->SetFillColor(5);
 224   Activation->SetXTitle("activation");
 225
 226   Int_t ntracks = (Int_t)gAlice->TreeH()->GetEntries();
 227
 228   Float_t trackglob[3];
 229   Float_t trackloc[3];
 230
 231   //printf("Area de uma elipse com teta 0 e Omega 45:%f",Area(0,45));
 232
 233   Int_t track;
 234
 235   for (track=0; track<ntracks;track++) {
 236     gAlice->ResetHits();
 237     gAlice->TreeH()->GetEvent(track);
 238     TClonesArray *pHits  = pRICH->Hits();
 239     if (pHits == 0) return;
 240     Int_t nhits = pHits->GetEntriesFast();
 241     if (nhits == 0) continue;
 242     //Int_t nent=(Int_t)gAlice->TreeD()->GetEntries();
 243     AliRICHHit *mHit = 0;
 244     //Int_t npoints=0;
 245
 246     Int_t counter=0, counter1=0;
 247     //Initialization
 248     for(i=0;i<kDimensionTheta;i++)
 249       {
 250         for(j=0;j<kDimensionPhi;j++)
 251           {
 252             for(k=0;k<kDimensionOmega;k++)
 253               {
 254                 counter++;
 255                 point[i][j][k]=0;
 256                 //printf("Dimensions theta:%d, phi:%d, omega:%d",kDimensionTheta,kDimensionPhi,kDimensionOmega);
 257                 //printf("Resetting %d %d %d, time %d\n",i,j,k,counter);
 258                 //-Noise_Level*(Area(i*kPi/(18*dimension),k*kMaxOmega/dimension)-Area((i-1)*kPi/(18*dimension),(k-1)*kMaxOmega/dimension));
 259                 //printf("n-%f",-Noise_Level*(Area(i*kPi/(18*dimension),k*kMaxOmega/dimension)-Area((i-1)*kPi/(18*dimension),(k-1)*kMaxOmega/dimension)));
 260               }
 261           }
 262       }
 263
 264     Int_t ncerenkovs = pRICH->Cerenkovs()->GetEntriesFast();
 265
 266
 267     originalOmega = 0;
 268     counter = 0;
 269
 270     for (Int_t hit=0;hit<ncerenkovs;hit++) {
 271       AliRICHCerenkov* cHit = (AliRICHCerenkov*) pRICH->Cerenkovs()->UncheckedAt(hit);
 272       Float_t loss = cHit->fLoss;                 //did it hit the CsI?
 273       Float_t production = cHit->fProduction;     //was it produced in freon?
 274       Float_t cherenkov = cHit->fCerenkovAngle;   //production cerenkov angle
 275       if (loss == 4 && production == 1)
 276         {
 277           counter +=1;
 278           originalOmega += cherenkov;
 279           //printf("%f\n",cherenkov);
 280         }
 281     }
 282
 283     printf("Cerenkovs       : %d\n",counter);
 284
 285     if(counter != 0)    //if there are cerenkovs
 286       {
 287         originalOmega = originalOmega/counter;
 288         printf("Original omega: %f\n",originalOmega);
 289
 290
 291
 292         mHit = (AliRICHHit*) pHits->UncheckedAt(0);
 293         Int_t nch  = mHit->Chamber();
 294         originalTheta = mHit->Theta();
 295         originalPhi = mHit->Phi();
 296         trackglob[0] = mHit->X();
 297         trackglob[1] = mHit->Y();
 298         trackglob[2] = mHit->Z();
 299
 300         printf("\n--------------------------------------\n");
 301         printf("Chamber %d, track %d\n", nch, track);
 302
 303
 304         iChamber = &(pRICH->Chamber(nch-1));
 305
 306         //printf("Nch:%d\n",nch);
 307
 308         iChamber->GlobaltoLocal(trackglob,trackloc);
 309
 310         iChamber->LocaltoGlobal(trackloc,trackglob);
 311
 312
 313         cx=trackloc[0];
 314         cy=trackloc[2];
 315
 316         AliRICHDigit *points = 0;
 317         TClonesArray *pDigits = pRICH->DigitsAddress(nch-1);
 318
 319         AliRICHRawCluster *cluster =0;
 320         TClonesArray *pClusters = pRICH->RawClustAddress(nch-1);
 321
 322         Int_t maxcycle=0;
 323
 324         //digitize from digits
 325
 326         if(type==0)
 327           {
 328             gAlice->TreeD()->GetEvent(0);
 329             Int_t ndigits = pDigits->GetEntriesFast();
 330             maxcycle=ndigits;
 331             printf("Got %d digits\n",ndigits);
 332           }
 333
 334         //digitize from clusters
 335
 336         if(type==1)
 337           {
 338             Int_t nent=(Int_t)gAlice->TreeR()->GetEntries();
 339             gAlice->TreeR()->GetEvent(nent-1);
 340             Int_t nclusters = pClusters->GetEntriesFast();
 341             maxcycle=nclusters;
 342             printf("Got %d clusters\n",nclusters);
 343           }
 344
 345
 346
 347
 348         counter=0;
 349         printf("Starting calculations\n");
 350         printf("           Start                                                                                              Finish\n");
 351         printf("Progress:     ");
 352         for(Float_t theta=0;theta<kMaxTheta;theta+=steptheta)
 353           {
 354             printf(".");
 355             for(Float_t phi=0;phi<=kMaxPhi;phi+=stepphi)
 356               {
 357                 //printf("Phi:%3.1f\n", phi*180/kPi);
 358                 counter1=0;
 359                 for (Int_t cycle=0;cycle<maxcycle;cycle++)
 360                   {
 361
 362                     if(type==0)
 363                       {
 364                         points=(AliRICHDigit*) pDigits->UncheckedAt(cycle);
 365                         segmentation->GetPadC(points->PadX(), points->PadY(),x, y, z);
 366                       }
 367
 368                     if(type==1)
 369                       {
 370                         cluster=(AliRICHRawCluster*) pClusters->UncheckedAt(cycle);
 371                         x=cluster->fX;
 372                         y=cluster->fY;
 373                         q=cluster->fQ;
 374                       }
 375
 376                     if(type ==0 || q > 100)
 377
 378                       {
 379
 380                         x=x-cx;
 381                         y=y-cy;
 382                         radius=TMath::Sqrt(TMath::Power(x,2)+TMath::Power(y,2));
 383
 384                         //calculation of relative phi angle of digit
 385
 386                         phi_relative = acos(y/radius);
 387                         phi_relative = TMath::Abs(phi_relative - phi);
 388
 389
 390                         if(radius>4)
 391                           {
 392                             meanradius+=radius;
 393                             counter++;
 394
 395
 396                             //if (radius < (2*kHeight*tan(theta+kMaxOmega)))
 397                             if (radius < (2*kHeight*tan(kMaxOmega)))
 398                               //if(Fiducial(x,y,theta,phi,kHeight,kMaxOmega,kMinOmega))
 399                               {
 400
 401                                 if(phi==0)
 402                                   {
 403                                 //printf("Radius: %f, Max Radius: %f\n",radius,2*kHeight*tan(theta+kMaxOmega)*3/4);
 404                                 //printf("Loaded digit %d with coordinates x:%f, y%f\n",dig,x,y);
 405                                 //printf("Using digit %d, for theta %f\n",dig,theta);
 406                                   }
 407
 408                                 counter1++;
 409
 410                                 l=kHeight/cos(theta);
 411
 412                                 //main calculation
 413
 414                                 DigitsXY->Fill(x,y,(float) 1);
 415
 416                                 theta1=SnellAngle(theta);
 417
 418                                 aux1=-y*sin(phi)+x*cos(phi);
 419                                 aux2=y*cos(phi)+x*sin(phi);
 420                                 aux3=( TMath::Power(aux1,2)+TMath::Power(cos(theta1)*aux2 ,2))/TMath::Power(sin(theta1)*aux2+l,2);
 421                                 omega=atan(sqrt(aux3));
 422
 423                                 //omega is distorted, theta1 is distorted
 424
 425                                 if(InvSnellAngle(omega+TMath::Abs(cos(phi_relative))*theta1)<999)
 426                                   {
 427                                     omega1=InvSnellAngle(omega+TMath::Abs(cos(phi_relative))*theta);
 428                                     theta1=InvSnellAngle(theta1);
 429
 430                                   }
 431                                 else
 432                                   {
 433                                     omega1=0;
 434                                     theta1=0;
 435                                   }
 436
 437                                 if(omega1<kMaxOmega && omega1>kMinOmega)
 438                                   {
 439                                 //printf("Omega found:%f\n",omega);
 440                                     omega1=omega1-kMinOmega;
 441
 442                                 //printf("Omega: %f Theta: %3.1f Phi:%3.1f\n",omega, theta*180/kPi, phi*180/kPi);
 443
 444                                     bintheta=theta1*kDimensionTheta/kMaxTheta;
 445                                     binphi=phi*kDimensionPhi/kMaxPhi;
 446                                     binomega=omega1*kDimensionOmega/(kMaxOmega-kMinOmega);
 447
 448                                     if(Int_t(bintheta+0.5)==Int_t(bintheta))
 449                                       inttheta=Int_t(bintheta);
 450                                     else
 451                                       inttheta=Int_t(bintheta+0.5);
 452
 453                                     if(Int_t(binomega+0.5)==Int_t(binomega))
 454                                       intomega=Int_t(binomega);
 455                                     else
 456                                       intomega=Int_t(binomega+0.5);
 457
 458                                     if(Int_t(binphi+0.5)==Int_t(binphi))
 459                                       intphi=Int_t(binphi);
 460                                     else
 461                                       intphi=Int_t(binphi+0.5);
 462
 463                                 //printf("Point added at %d %d %d\n",inttheta,intphi,intomega);
 464
 465                                     if(type==0)
 466                                       point[inttheta][intphi][intomega]+=1;
 467                                     if(type==1)
 468                                       point[inttheta][intphi][intomega]+=(Int_t)(q);
 469
 470                                 //printf("Omega stored:%d\n",intomega);
 471                                     Points->Fill(inttheta,intphi,intomega,(float) 1);
 472                                     ThetaPhi->Fill(inttheta,intphi,(float) 1);
 473                                     OmegaTheta->Fill(inttheta,intomega,(float) 1);
 474                                     OmegaPhi->Fill(intphi,intomega,(float) 1);
 475                                 //printf("Filling at %d %d %d\n",Int_t(theta*kDimensionTheta/kMaxTheta),Int_t(phi*kDimensionPhi/kMaxPhi),Int_t(omega*kDimensionOmega/kMaxOmega));
 476                                   }
 477                                 //if(omega<kMaxOmega)point[Int_t(theta)][Int_t(phi)][Int_t(omega)]+=1;
 478                               }
 479                           }
 480                       }
 481
 482                   }
 483                 //printf("Used %d digits for theta %3.1f\n",counter1, theta*180/kPi);
 484               }
 485
 486           }
 487
 488         printf("\n");
 489
 490         meanradius=meanradius/counter;
 491         //printf("Mean radius:%f, counter:%d\n",meanradius,counter);
 492         rechit[5]=meanradius;
 493         //printf("Used %d digits\n",counter1);
 494         //printf("\n");
 495
 496         if(nev<2)
 497           {
 498             if(nev==0)
 499               {
 500                 fc1->cd(1);
 501                 Points->Draw("colz");
 502                 fc1->cd(2);
 503                 ThetaPhi->Draw("colz");
 504                 fc1->cd(3);
 505                 OmegaTheta->Draw("colz");
 506                 fc1->cd(4);
 507                 OmegaPhi->Draw("colz");
 508                 fc3->cd();
 509                 DigitsXY->Draw("colz");
 510               }
 511             else
 512               {
 513                 //fc1->cd(1);
 514                 //Points->Draw("same");
 515                 //fc1->cd(2);
 516                 //ThetaPhi->Draw("same");
 517                 //fc1->cd(3);
 518                 //OmegaTheta->Draw("same");
 519                 //fc1->cd(4);
 520                 //OmegaPhi->Draw("same");
 521               }
 522           }
 523
 524
 525         //SPOT execute twice
 526         for(Int_t s=0;s<kSpot;s++)
 527           {
 528             printf("     Applying Spot algorithm, pass %d\n", s);
 529
 530         //buffer copy
 531         for(i=0;i<=kDimensionTheta;i++)
 532           {
 533             for(j=0;j<=kDimensionPhi;j++)
 534               {
 535                 for(k=0;k<=kDimensionOmega;k++)
 536                   {
 537                     point1[i][j][k]=point[i][j][k];
 538                   }
 539               }
 540           }
 541
 542         //SPOT algorithm
 543         for(i=1;i<kDimensionTheta-1;i++)
 544           {
 545             for(j=1;j<kDimensionPhi-1;j++)
 546               {
 547                 for(k=1;k<kDimensionOmega-1;k++)
 548                   {
 549                     if((point[i][k][j]>point[i-1][k][j])&&(point[i][k][j]>point[i+1][k][j])&&
 550                        (point[i][k][j]>point[i][k-1][j])&&(point[i][k][j]>point[i][k+1][j])&&
 551                        (point[i][k][j]>point[i][k][j-1])&&(point[i][k][j]>point[i][k][j+1]))
 552                       {
 553                         //cout<<"SPOT"<<endl;
 554                         //Execute SPOT on point
 555                         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]));
 556                         point1[i-1][k][j]=Int_t(SPOTp*point[i-1][k][j]);
 557                         point1[i+1][k][j]=Int_t(SPOTp*point[i+1][k][j]);
 558                         point1[i][k-1][j]=Int_t(SPOTp*point[i][k-1][j]);
 559                         point1[i][k+1][j]=Int_t(SPOTp*point[i][k+1][j]);
 560                         point1[i][k][j-1]=Int_t(SPOTp*point[i][k][j-1]);
 561                         point1[i][k][j+1]=Int_t(SPOTp*point[i][k][j+1]);
 562                       }
 563                   }
 564               }
 565           }
 566
 567         //copy from buffer copy
 568         counter1=0;
 569         for(i=1;i<kDimensionTheta;i++)
 570           {
 571             for(j=1;j<kDimensionPhi;j++)
 572               {
 573                 for(k=1;k<kDimensionOmega;k++)
 574                   {
 575                     point[i][j][k]=point1[i][j][k];
 576                     if(nev<20)
 577                       {
 578                         if(s==kSpot-1)
 579                           {
 580                             if(point1[i][j][k] != 0)
 581                               {
 582                                 SpotPoints->Fill(i,j,k,(float) point1[i][j][k]);
 583                                 //printf("Random number %f\n",random->Rndm(2));
 584                                 //if(random->Rndm() < .2)
 585                                   //{
 586                                 SpotThetaPhi->Fill(i,j,(float) point1[i][j][k]);
 587                                 SpotOmegaTheta->Fill(i,k,(float) point1[i][j][k]);
 588                                 SpotOmegaPhi->Fill(j,k,(float) point1[i][j][k]);
 589                                     counter1++;
 590                                   //}
 591                                 //printf("Filling at %d %d %d value %f\n",i,j,k,(float) point1[i][j][k]);
 592                               }
 593                           }
 594                       }
 595                     //if(point1[i][j][k] != 0)
 596                       //printf("Last transfer point: %d, point1, %d\n",point[i][j][k],point1[i][j][k]);
 597                   }
 598               }
 599           }
 600       }
 601
 602     //printf("Filled %d cells\n",counter1);
 603
 604         if(nev<2)
 605           {
 606             if(nev==0)
 607               {
 608                 fc2->cd(1);
 609                 SpotPoints->Draw("colz");
 610                 fc2->cd(2);
 611                 SpotThetaPhi->Draw("colz");
 612                 fc2->cd(3);
 613                 SpotOmegaTheta->Draw("colz");
 614                 fc2->cd(4);
 615                 SpotOmegaPhi->Draw("colz");
 616               }
 617             else
 618               {
 619                 //fc2->cd(1);
 620                 //SpotPoints->Draw("same");
 621                 //fc2->cd(2);
 622                 //SpotThetaPhi->Draw("same");
 623                 //fc2->cd(3);
 624                 //SpotOmegaTheta->Draw("same");
 625                 //fc2->cd(4);
 626                 //SpotOmegaPhi->Draw("same");
 627               }
 628           }
 629
 630
 631         //Identification is equivalent to maximum determination
 632         max=0;maxi=0;maxj=0;maxk=0;
 633
 634         printf("     Proceeding to identification");
 635
 636         for(i=0;i<kDimensionTheta;i++)
 637           for(j=0;j<kDimensionPhi;j++)
 638             for(k=0;k<kDimensionOmega;k++)
 639               if(point[i][j][k]>max)
 640                 {
 641                   //cout<<"maxi="<<i*90/dimension<<" maxj="<<j*90/dimension<<" maxk="<<k*kMaxOmega/dimension*180/kPi<<" max="<<max<<endl;
 642                 maxi=i;maxj=j;maxk=k;
 643                 max=point[i][j][k];
 644                 printf(".");
 645                 //printf("Max Omega %d, Max Theta %d, Max Phi %d (%d counts)\n",maxk,maxi,maxj,max);
 646                 }
 647         printf("\n");
 648
 649         Float_t FinalOmega = maxk*(kMaxOmega-kMinOmega)/kDimensionOmega;
 650         Float_t FinalTheta = maxi*kMaxTheta/kDimensionTheta;
 651         Float_t FinalPhi = maxj*kMaxPhi/kDimensionPhi;
 652
 653         FinalOmega += kMinOmega;
 654
 655         //printf("Detected angle for height %3.1f and for center %3.1f %3.1f:%f\n",h,cx,cy,maxk*kPi/(kDimensionTheta*4));
 656         printf("     Indentified angles: cerenkov - %f, theta - %3.1f, phi - %3.1f (%f activation)\n", FinalOmega, FinalTheta*180/kPi, FinalPhi*180/kPi, max);
 657         //printf("Detected angle for height %3.1f and for center %3.1f %3.1f:%f\n",kHeight,cx,cy,maxk);
 658
 659         AngleAct->Fill(FinalOmega, (float) max);
 660         Activation->Fill(max, (float) 1);
 661
 662         if(nev==0)
 663               {
 664                 fc4->cd(1);
 665                 AngleAct->Draw();
 666                 fc4->cd(2);
 667                 Activation->Draw();
 668               }
 669             else
 670               {
 671                 fc4->cd(1);
 672                 AngleAct->Draw("same");
 673                 fc4->cd(2);
 674                 Activation->Draw("same");
 675               }
 676
 677
 678         //fscanf(omegas,"%f",&realomega);
 679         //fscanf(thetas,"%f",&realtheta);
 680         //printf("Real Omega: %f",realomega);
 681         //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;
 682
 683         //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));
 684
 685     /*for(j=0;j<np;j++)
 686       pointpp(maxj*90/kDimensionTheta,maxi*90/kDimensionPhi,maxk*kMaxOmega/kDimensionOmega*180/kPi,cx,cy);//Generates a point on the elipse*/
 687
 688
 689     //Start filling rec. hits
 690
 691     rechit[0] = FinalTheta;
 692     rechit[1] = FinalPhi - 90*kPi/180;
 693     rechit[2] = FinalOmega;
 694     rechit[3] = cx;
 695     rechit[4] = cy;
 696
 697     //CreatePoints(FinalTheta, 270*kPi/180 + FinalPhi, FinalOmega, kHeight);
 698
 699     printf ("track %d, theta %f, phi %f, omega %f\n\n\n",track,rechit[0],rechit[1]*180/kPi,rechit[2]);
 700
 701     // fill rechits
 702     pRICH->AddRecHit3D(nch-1,rechit,originalOmega, originalTheta, originalPhi);
 703     //printf("rechit %f %f %f %f %f\n",rechit[0],rechit[1],rechit[2],rechit[3],rechit[4]);
 704     //printf("Chamber:%d",nch);
 705       }
 706
 707     else   //if no cerenkovs
 708
 709       {
 710
 711         rechit[0] = 0;
 712         rechit[1] = 0;
 713         rechit[2] = 0;
 714         rechit[3] = 0;
 715         rechit[4] = 0;
 716
 717       }
 718
 719   }
 720
 721   if(type==1)  //reco from clusters
 722     {
 723       pRICH->ResetRawClusters();
 724       //Int_t nent=(Int_t)gAlice->TreeR()->GetEntries();
 725       //gAlice->TreeR()->GetEvent(track);
 726       //printf("Going to branch %d\n",track);
 727       //gAlice->GetEvent(nev);
 728     }
 729
 730
 731     //printf("\n\n\n\n");
 732     gAlice->TreeR()->Fill();
 733   TClonesArray *fRec;
 734   for (i=0;i<kNCH;i++) {
 735     fRec=pRICH->RecHitsAddress3D(i);
 736     int ndig=fRec->GetEntriesFast();
 737     printf ("Chamber %d, rings %d\n",i+1,ndig);
 738   }
 739   pRICH->ResetRecHits3D();
 740
 741   free_i3tensor(point,0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 742   free_i3tensor(point1,0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 743 }
 744
 745
 746
 747 Float_t AliRICHDetect:: Area(Float_t theta,Float_t omega)
 748 {
 749
 750 //
 751 // Calculates area of an ellipse for given incidence angles
 752
 753
 754     Float_t area;
 755     const Float_t kHeight=9.25;                       //Distance from Radiator to Pads in pads
 756
 757     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);
 758
 759     return (area);
 760 }
 761
 762
 763 Int_t ***AliRICHDetect::i3tensor(long nrl, long nrh, long ncl, long nch, long ndl, long ndh)
 764 // allocate a Int_t 3tensor with range t[nrl..nrh][ncl..nch][ndl..ndh]
 765 {
 766   long i,j,nrow=nrh-nrl+1,ncol=nch-ncl+1,ndep=ndh-ndl+1;
 767   Int_t ***t;
 768
 769   int NR_END=1;
 770
 771   // allocate pointers to pointers to rows
 772   t=(Int_t ***) malloc((size_t)((nrow+NR_END)*sizeof(Int_t**)));
 773   if (!t) printf("allocation failure 1 in f3tensor()");
 774   t += NR_END;
 775   t -= nrl;
 776
 777   // allocate pointers to rows and set pointers to them
 778   t[nrl]=(Int_t **) malloc((size_t)((nrow*ncol+NR_END)*sizeof(Int_t*)));
 779   if (!t[nrl]) printf("allocation failure 2 in f3tensor()");
 780   t[nrl] += NR_END;
 781   t[nrl] -= ncl;
 782
 783   // allocate rows and set pointers to them
 784   t[nrl][ncl]=(Int_t *) malloc((size_t)((nrow*ncol*ndep+NR_END)*sizeof(Int_t)));
 785   if (!t[nrl][ncl]) printf("allocation failure 3 in f3tensor()");
 786   t[nrl][ncl] += NR_END;
 787   t[nrl][ncl] -= ndl;
 788
 789   for(j=ncl+1;j<=nch;j++) t[nrl][j]=t[nrl][j-1]+ndep;
 790   for(i=nrl+1;i<=nrh;i++) {
 791     t[i]=t[i-1]+ncol;
 792     t[i][ncl]=t[i-1][ncl]+ncol*ndep;
 793     for(j=ncl+1;j<=nch;j++) t[i][j]=t[i][j-1]+ndep;
 794   }
 795
 796   // return pointer to array of pointers to rows
 797   return t;
 798 }
 799
 800 void AliRICHDetect::free_i3tensor(int ***t, long nrl, long nrh, long ncl, long nch,long ndl, long ndh)
 801 // free a Int_t f3tensor allocated by i3tensor()
 802 {
 803   int NR_END=1;
 804
 805   free((char*) (t[nrl][ncl]+ndl-NR_END));
 806   free((char*) (t[nrl]+ncl-NR_END));
 807   free((char*) (t+nrl-NR_END));
 808 }
 809
 810
 811 Float_t AliRICHDetect:: SnellAngle(Float_t iangle)
 812 {
 813
 814 // Compute the Snell angle
 815
 816   Float_t nfreon  = 1.295;
 817   Float_t nquartz = 1.585;
 818   Float_t ngas = 1;
 819
 820   Float_t sinrangle;
 821   Float_t rangle;
 822   Float_t a1, a2;
 823
 824   a1=nfreon/nquartz;
 825   a2=nquartz/ngas;
 826
 827   sinrangle = a1*a2*sin(iangle);
 828
 829   if(sinrangle>1.) {
 830      rangle = 999.;
 831      return rangle;
 832   }
 833
 834   rangle = asin(sinrangle);
 835   return rangle;
 836 }
 837
 838 Float_t AliRICHDetect:: InvSnellAngle(Float_t rangle)
 839 {
 840
 841 // Compute the inverse Snell angle
 842
 843   Float_t nfreon  = 1.295;
 844   Float_t nquartz = 1.585;
 845   Float_t ngas = 1;
 846
 847   Float_t siniangle;
 848   Float_t iangle;
 849   Float_t a1,a2;
 850
 851   a1=nfreon/nquartz;
 852   a2=nquartz/ngas;
 853
 854   siniangle = sin(rangle)/(a1*a2);
 855   iangle = asin(siniangle);
 856
 857   if(siniangle>1.) {
 858      iangle = 999.;
 859      return iangle;
 860   }
 861
 862   iangle = asin(siniangle);
 863   return iangle;
 864 }
 865
 866
 867
 868 //________________________________________________________________________________
 869 void AliRICHDetect::CreatePoints(Float_t theta, Float_t phi, Float_t omega, Float_t h)
 870 {
 871
 872   // Create points along the ellipse equation
 873
 874   Int_t s1,s2;
 875   Float_t fiducial=h*TMath::Tan(omega+theta), l=h/TMath::Cos(theta), xtrial, y=0, c0, c1, c2;
 876   //TRandom *random=new TRandom();
 877
 878   static TH2F *REllipse = new TH2F("REllipse","Reconstructed ellipses",150,-25,25,150,-25,25);
 879
 880   for(Float_t i=0;i<1000;i++)
 881     {
 882
 883       Float_t counter=0;
 884
 885       c0=0;c1=0;c2=0;
 886       while((c1*c1-4*c2*c0)<=0 && counter<1000)
 887         {
 888           //Choose which side to go...
 889           if(i>250 && i<750) s1=1;
 890           //if (gRandom->Rndm(1)>.5) s1=1;
 891           else s1=-1;
 892           //printf("s1:%d\n",s1);
 893           //Trial a y
 894           y=s1*i*gRandom->Rndm(Int_t(fiducial/50));
 895           //printf("Fiducial %f  for omega:%f theta:%f phi:%f\n",fiducial,omega,theta,fphi);
 896           Float_t alfa1=theta;
 897           Float_t theta1=phi;
 898           Float_t omega1=omega;
 899
 900           //Solve the eq for a trial x
 901           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);
 902           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);
 903           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);
 904           //cout<<"Trial: y="<<y<<"c0="<<c0<<" c1="<<c1<<" c2="<<c2<<endl;
 905           //printf("Result:%f\n\n",c1*c1-4*c2*c0);
 906           //i+=.01;
 907           counter +=1;
 908         }
 909
 910       if (counter>=1000)
 911         y=0;
 912
 913       //Choose which side to go...
 914       //if(gRandom->Rndm(1)>.5) s=1;
 915       //else s=-1;
 916       if(i>500) s2=1;
 917       //if (gRandom->Rndm(1)>.5) s2=1;
 918       else s2=-1;
 919       xtrial=(-c1+s2*TMath::Sqrt(c1*c1-4*c2*c0))/(2*c2);
 920       //cout<<"x="<<xtrial<<" y="<<cy+y<<endl;
 921       //printf("Coordinates: %f %f\n",xtrial,fCy+y);
 922
 923       REllipse->Fill(xtrial,y);
 924
 925       //printf("Coordinates: %f %f %f\n",vectorGlob[0],vectorGlob[1],vectorGlob[2]);
 926     }
 927
 928   fc3->cd(2);
 929   REllipse->Draw();
 930 }
 931
 932 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)
 933 {
 934
 935   Float_t x,y,y1,h,omega1,omega2;
 936
 937   Float_t a,b, offset;
 938   Float_t a1,b1, offset1;
 939
 940   h = height;
 941
 942   //refraction calculation
 943
 944   theta = SnellAngle(theta);
 945   phi = phi - TMath::Pi();
 946   omega1 = SnellAngle(maxOmega);
 947   omega2 = SnellAngle(minOmega);
 948
 949   //maximum zone
 950   a = h*(tan(omega1+theta)+tan(omega1-theta))/2;
 951   b = h*tan(omega1);
 952
 953   offset = h*(tan(omega1+theta)-tan(omega1-theta))/2;
 954
 955
 956   //minimum zone
 957   a1 = h*(tan(omega2+theta)+tan(omega2-theta))/2;
 958   b1 = h*tan(omega2);
 959
 960   offset1 = h*(tan(omega2+theta)-tan(omega2-theta))/2;
 961
 962
 963   //rotation to phi=0
 964   x = rotx*cos(phi)+roty*sin(phi);
 965   y = -rotx*sin(phi)+roty*cos(phi) - offset;
 966   y1 = -rotx*sin(phi)+roty*cos(phi) - offset1;
 967
 968
 969   if(x*x/a+y*y/b<1 && x*x/a1+y1*y1/b1>1)
 970     return 1;
 971   else
 972     return 0;
 973
 974 }