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 1.13  2001/05/10 12:26:31  jbarbosa
  19   Totally reworked version of reconstruction algorithm.
  20
  21   Revision 1.12  2001/02/27 22:15:03  jbarbosa
  22   Removed compiler warning.
  23
  24   Revision 1.11  2001/02/27 15:21:46  jbarbosa
  25   Transition to SDigits.
  26
  27   Revision 1.10  2001/02/13 20:39:06  jbarbosa
  28   Changes to make it work with new IO.
  29
  30   Revision 1.9  2001/01/22 21:39:11  jbarbosa
  31   Several tune-ups
  32
  33   Revision 1.8  2000/11/15 15:52:53  jbarbosa
  34   Turned on spot algorithm.
  35
  36   Revision 1.7  2000/11/01 15:37:05  jbarbosa
  37   Updated to use its own rec. point object.
  38
  39   Revision 1.6  2000/10/02 21:28:12  fca
  40   Removal of useless dependecies via forward declarations
  41
  42   Revision 1.5  2000/06/30 16:30:28  dibari
  43   Disabled writing to rechits.
  44
  45   Revision 1.4  2000/06/15 15:46:59  jbarbosa
  46   Corrected compilation errors on HP-UX (replaced pow with TMath::Power)
  47
  48   Revision 1.3  2000/06/13 13:15:41  jbarbosa
  49   Still some code cleanup done (variable names)
  50
  51   Revision 1.2  2000/06/12 15:19:30  jbarbosa
  52   Cleaned up version.
  53
  54   Revision 1.1  2000/04/19 13:05:14  morsch
  55   J. Barbosa's spot reconstruction algorithm.
  56
  57 */
  58
  59 #include <stdlib.h>
  60
  61
  62 #include "AliRICH.h"
  63 #include "AliRICHPoints.h"
  64 #include "AliRICHDetect.h"
  65 #include "AliRICHHit.h"
  66 #include "AliRICHDigit.h"
  67 #include "AliRICHSegmentationV0.h"
  68 #include "AliRun.h"
  69 #include "TParticle.h"
  70 #include "TTree.h"
  71 #include "TMath.h"
  72 #include "TRandom.h"
  73 #include "TH3.h"
  74 #include "TH2.h"
  75 #include "TCanvas.h"
  76
  77 #include "malloc.h"
  78
  79
  80 ClassImp(AliRICHDetect)
  81 //___________________________________________
  82 AliRICHDetect::AliRICHDetect() : TObject()
  83 {
  84
  85 // Default constructor
  86
  87 }
  88
  89 //___________________________________________
  90 AliRICHDetect::AliRICHDetect(const char *name, const char *title)
  91     : TObject()
  92 {
  93
  94
  95   fc1= new TCanvas("c1","Reconstructed points",50,50,300,350);
  96   fc1->Divide(2,2);
  97   fc2= new TCanvas("c2","Reconstructed points after SPOT",50,50,300,350);
  98   fc2->Divide(2,2);
  99   fc3= new TCanvas("c3","Used Digits",50,50,300,350);
 100   //fc3->Divide(2,1);
 101
 102 }
 103
 104 //___________________________________________
 105 AliRICHDetect::~AliRICHDetect()
 106 {
 107
 108 // Destructor
 109
 110 }
 111
 112
 113 void AliRICHDetect::Detect(Int_t nev)
 114 {
 115
 116 //
 117 // Detection algorithm
 118
 119
 120   //printf("Detection started!\n");
 121   Float_t omega,omega1,theta1,steptheta,stepphi,x,y,z,cx,cy,l,aux1,aux2,aux3,max,radius=0,meanradius=0;
 122   Int_t maxi,maxj,maxk;
 123   //Float_t theta,phi,realomega,realtheta;
 124   Float_t binomega, bintheta, binphi;
 125   Int_t intomega, inttheta, intphi;
 126   Int_t i,j,k;
 127
 128   AliRICH *pRICH  = (AliRICH*)gAlice->GetDetector("RICH");
 129   AliRICHSegmentationV0*  segmentation;
 130   AliRICHChamber*       iChamber;
 131   AliRICHGeometry*  geometry;
 132
 133   iChamber = &(pRICH->Chamber(0));
 134   segmentation=(AliRICHSegmentationV0*) iChamber->GetSegmentationModel(0);
 135   geometry=iChamber->GetGeometryModel();
 136
 137
 138   //const Float_t Noise_Level=0;                       //Noise Level in percentage of mesh points
 139   //const Float_t t=0.6;                               //Softening of Noise Correction (factor)
 140
 141   const Float_t kPi=TMath::Pi();
 142
 143   const Float_t kHeight=geometry->GetRadiatorToPads(); //Distance from Radiator to Pads in centimeters
 144   //printf("Distance to Pads:%f\n",kHeight);
 145
 146   const Int_t kSpot=0;                                 //number of passes with spot algorithm
 147
 148   const Int_t kDimensionTheta=30;                      //Matrix dimension for angle Detection
 149   const Int_t kDimensionPhi=45;
 150   const Int_t kDimensionOmega=100;
 151
 152   const Float_t SPOTp=1;                              //Percentage of spot action
 153   const Float_t kMinOmega=20*kPi/180;
 154   const Float_t kMaxOmega=70*kPi/180;                 //Maximum Cherenkov angle to identify
 155   const Float_t kMinTheta=0;
 156   const Float_t kMaxTheta=15*kPi/180;
 157   //const Float_t kMaxTheta=0.1;
 158   const Float_t kMinPhi=0;
 159   const Float_t kMaxPhi=360*kPi/180;
 160
 161
 162   Float_t kCorr=0.61;                              //Correction factor, accounting for aberration, refractive index, etc.
 163   //const Float_t kCorr=.9369;                        //from 0 incidence
 164   //const Float_t kCorr=1;
 165
 166   //TRandom* random=0;
 167
 168   Float_t rechit[6];                                 //Reconstructed point data
 169
 170
 171
 172   //printf("Creating matrices\n");
 173   //Float_t point[kDimensionTheta][kDimensionPhi][kDimensionOmega];
 174   //Float_t point1[kDimensionTheta][kDimensionPhi][kDimensionOmega];
 175   //printf("Created matrices\n");
 176
 177   Int_t ***point = i3tensor(0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 178   Int_t ***point1 = i3tensor(0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 179
 180   //Int_t **point  = new Int_t[kDimensionTheta][kDimensionPhi][kDimensionOmega];
 181   //Int_t **point1 = new Int_t[kDimensionTheta][kDimensionPhi][kDimensionOmega];
 182
 183   steptheta=(kMaxTheta-kMinTheta)/kDimensionTheta;
 184   stepphi=(kMaxPhi-kMinPhi)/kDimensionPhi;
 185
 186   static TH3F *Points = new TH3F("Points","Reconstructed points 3D",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 187   static TH2F *ThetaPhi = new TH2F("ThetaPhi","Theta-Phi projection",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi);
 188   static TH2F *OmegaTheta = new TH2F("OmegaTheta","Omega-Theta projection",kDimensionTheta,0,kDimensionTheta,kDimensionOmega,0,kDimensionOmega);
 189   static TH2F *OmegaPhi = new TH2F("OmegaPhi","Omega-Phi projection",kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 190   static TH3F *SpotPoints = new TH3F("Points","Reconstructed points 3D, spot",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 191   static TH2F *SpotThetaPhi = new TH2F("ThetaPhi","Theta-Phi projection, spot",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi);
 192   static TH2F *SpotOmegaTheta = new TH2F("OmegaTheta","Omega-Theta projection, spot",kDimensionTheta,0,kDimensionTheta,kDimensionOmega,0,kDimensionOmega);
 193   static TH2F *SpotOmegaPhi = new TH2F("OmegaPhi","Omega-Phi projection, spot",kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 194   static TH2F *DigitsXY = new TH2F("DigitsXY","Pads used for reconstruction",150,-25,25,150,-25,25);
 195   Points->SetXTitle("theta");
 196   Points->SetYTitle("phi");
 197   Points->SetZTitle("omega");
 198   ThetaPhi->SetXTitle("theta");
 199   ThetaPhi->SetYTitle("phi");
 200   OmegaTheta->SetXTitle("theta");
 201   OmegaTheta->SetYTitle("omega");
 202   OmegaPhi->SetXTitle("phi");
 203   OmegaPhi->SetYTitle("omega");
 204   SpotPoints->SetXTitle("theta");
 205   SpotPoints->SetYTitle("phi");
 206   SpotPoints->SetZTitle("omega");
 207   SpotThetaPhi->SetXTitle("theta");
 208   SpotThetaPhi->SetYTitle("phi");
 209   SpotOmegaTheta->SetXTitle("theta");
 210   SpotOmegaTheta->SetYTitle("omega");
 211   SpotOmegaPhi->SetXTitle("phi");
 212   SpotOmegaPhi->SetYTitle("omega");
 213
 214   Int_t ntracks = (Int_t)gAlice->TreeH()->GetEntries();
 215   //Int_t ntrks = gAlice->GetNtrack();
 216
 217   Float_t trackglob[3];
 218   Float_t trackloc[3];
 219
 220   //printf("Area de uma elipse com teta 0 e Omega 45:%f",Area(0,45));
 221
 222   Int_t track;
 223
 224   for (track=0; track<ntracks;track++) {
 225     gAlice->ResetHits();
 226     gAlice->TreeH()->GetEvent(track);
 227     TClonesArray *pHits  = pRICH->Hits();
 228     if (pHits == 0) return;
 229     Int_t nhits = pHits->GetEntriesFast();
 230     if (nhits == 0) continue;
 231     //Int_t nent=(Int_t)gAlice->TreeD()->GetEntries();
 232     gAlice->TreeD()->GetEvent(0);
 233     AliRICHHit *mHit = 0;
 234     AliRICHDigit *points = 0;
 235     //Int_t npoints=0;
 236
 237     Int_t counter=0, counter1=0;
 238     //Initialization
 239     for(i=0;i<kDimensionTheta;i++)
 240       {
 241         for(j=0;j<kDimensionPhi;j++)
 242           {
 243             for(k=0;k<kDimensionOmega;k++)
 244               {
 245                 counter++;
 246                 point[i][j][k]=0;
 247                 //printf("Dimensions theta:%d, phi:%d, omega:%d",kDimensionTheta,kDimensionPhi,kDimensionOmega);
 248                 //printf("Resetting %d %d %d, time %d\n",i,j,k,counter);
 249                 //-Noise_Level*(Area(i*kPi/(18*dimension),k*kMaxOmega/dimension)-Area((i-1)*kPi/(18*dimension),(k-1)*kMaxOmega/dimension));
 250                 //printf("n-%f",-Noise_Level*(Area(i*kPi/(18*dimension),k*kMaxOmega/dimension)-Area((i-1)*kPi/(18*dimension),(k-1)*kMaxOmega/dimension)));
 251               }
 252           }
 253       }
 254     mHit = (AliRICHHit*) pHits->UncheckedAt(0);
 255     //printf("Aqui vou eu\n");
 256     Int_t nch  = mHit->fChamber;
 257     //printf("Aqui fui eu\n");
 258     trackglob[0] = mHit->X();
 259     trackglob[1] = mHit->Y();
 260     trackglob[2] = mHit->Z();
 261
 262     printf("Chamber processed:%d\n",nch);
 263
 264     printf("Reconstructing particle at (global coordinates): %3.1f %3.1f %3.1f,\n",trackglob[0],trackglob[1],trackglob[2]);
 265
 266     iChamber = &(pRICH->Chamber(nch-1));
 267
 268     //printf("Nch:%d\n",nch);
 269
 270     iChamber->GlobaltoLocal(trackglob,trackloc);
 271
 272     printf("Reconstructing particle at (local coordinates) : %3.1f %3.1f %3.1f\n",trackloc[0],trackloc[1],trackloc[2]);
 273
 274
 275     iChamber->LocaltoGlobal(trackloc,trackglob);
 276
 277     //printf("Transformation 2: %3.1f %3.1f %3.1f\n",trackglob[0],trackglob[1],trackglob[2]);
 278
 279     cx=trackloc[0];
 280     cy=trackloc[2];
 281
 282
 283     TClonesArray *pDigits = pRICH->DigitsAddress(nch-1);
 284     Int_t ndigits = pDigits->GetEntriesFast();
 285
 286     //printf("Got %d digits\n",ndigits);
 287
 288     counter=0;
 289     printf("Starting calculations\n");
 290     for(Float_t theta=0;theta<kMaxTheta;theta+=steptheta)
 291       {
 292         //printf(".");
 293         for(Float_t phi=0;phi<=kMaxPhi;phi+=stepphi)
 294           {
 295             //printf("Phi:%3.1f\n", phi*180/kPi);
 296             counter1=0;
 297             for (Int_t dig=0;dig<ndigits;dig++)
 298               {
 299                 points=(AliRICHDigit*) pDigits->UncheckedAt(dig);
 300                 segmentation->GetPadC(points->fPadX, points->fPadY,x, y, z);
 301                 x=x-cx;
 302                 y=y-cy;
 303                 radius=TMath::Sqrt(TMath::Power(x,2)+TMath::Power(y,2));
 304
 305                 if(radius>4)
 306                   {
 307                     //if(theta==0 && phi==0)
 308                       //{
 309                         //printf("Radius: %f, Max Radius: %f\n",radius,kCorr*kHeight*tan(theta+kMaxOmega)*3/4);
 310                         meanradius+=radius;
 311                         counter++;
 312                       //}
 313
 314                     if (radius<2*kHeight*tan(theta+kMaxOmega)*3/4)
 315                       {
 316
 317                         if(phi==0)
 318                           {
 319                             //printf("Radius: %f, Max Radius: %f\n",radius,2*kHeight*tan(theta+kMaxOmega)*3/4);
 320                             //printf("Loaded digit %d with coordinates x:%f, y%f\n",dig,x,y);
 321                             //printf("Using digit %d, for theta %f\n",dig,theta);
 322                           }
 323
 324                         counter1++;
 325
 326                         l=kHeight/cos(theta);
 327
 328                         //x=x*kCorr;
 329                         //y=y*kCorr;
 330                         /*if(SnellAngle(theta+omega)<999)
 331                           {
 332                             //printf("(Angle)/(Snell angle):%f\n",(theta+omega)/SnellAngle(theta+omega));
 333                             x=x*(theta+omega)/SnellAngle(theta+omega);
 334                             y=y*(theta+omega)/SnellAngle(theta+omega);
 335                           }
 336                         else
 337                           {
 338                             x=0;
 339                             y=0;
 340                           }*/
 341
 342                         //main calculation
 343
 344                         DigitsXY->Fill(x,y,(float) 1);
 345
 346                         theta1=SnellAngle(theta)*1.5;
 347
 348                         aux1=-y*sin(phi)+x*cos(phi);
 349                         aux2=y*cos(phi)+x*sin(phi);
 350                         aux3=( TMath::Power(aux1,2)+TMath::Power(cos(theta1)*aux2 ,2))/TMath::Power(sin(theta1)*aux2+l,2);
 351                         omega=atan(sqrt(aux3));
 352
 353                         //omega is distorted, theta1 is distorted
 354
 355                         if(InvSnellAngle(theta+omega)<999)
 356                           {
 357                             omega1=InvSnellAngle(omega+theta1) - theta;
 358                             //theta1=InvSnellAngle(omega+theta) - omega1;
 359                             //omega1=kCorr*omega;
 360
 361                             kCorr=InvSnellAngle(omega+theta)/(omega+theta);
 362                             theta1=kCorr*theta/1.4;
 363                             //if(phi==0)
 364                               //printf("Omega:%f Theta:%f Omega1:%f Theta1:%f ISA(o+t):%f ISA(t):%f\n",omega*180/kPi,theta*180/kPi,omega1*180/kPi,theta1*180/kPi,InvSnellAngle(omega+theta)*180/kPi,InvSnellAngle(theta)*180/kPi);
 365                           }
 366                         else
 367                           {
 368                             omega1=0;
 369                             theta1=0;
 370                           }
 371
 372                         //printf("Omega:%f\n",omega);
 373
 374
 375                         //if(SnellAngle(theta+omega)<999)
 376                           //printf("(Angle)/(Snell angle):%f\n",(theta+omega)/SnellAngle(theta+omega));
 377                         if(theta==0 && phi==0)
 378                           {
 379                             //printf("Omega: %f Corrected Omega: %f\n",omega, omega/kCorr);
 380                             //omega=omega/kCorr;
 381                           }
 382
 383                         //cout<<"\ni="<<i<<" theta="<<Int_t(2*theta*dimension/kPi)<<" phi="<<Int_t(2*phi*dimension/kPi)<<" omega="<<Int_t(2*omega*dimension/kPi)<<endl<<endl;
 384                         //{Int_t lixo;cin>>lixo;}
 385                         if(omega1<kMaxOmega && omega1>kMinOmega)
 386                           {
 387                             //printf("Omega found:%f\n",omega);
 388                             omega1=omega1-kMinOmega;
 389
 390                             //printf("Omega: %f Theta: %3.1f Phi:%3.1f\n",omega, theta*180/kPi, phi*180/kPi);
 391
 392                             bintheta=theta1*kDimensionTheta/kMaxTheta;
 393                             binphi=phi*kDimensionPhi/kMaxPhi;
 394                             binomega=omega1*kDimensionOmega/(kMaxOmega-kMinOmega);
 395
 396                             if(Int_t(bintheta+0.5)==Int_t(bintheta))
 397                               inttheta=Int_t(bintheta);
 398                             else
 399                               inttheta=Int_t(bintheta+0.5);
 400
 401                             if(Int_t(binomega+0.5)==Int_t(binomega))
 402                               intomega=Int_t(binomega);
 403                             else
 404                               intomega=Int_t(binomega+0.5);
 405
 406                             if(Int_t(binphi+0.5)==Int_t(binphi))
 407                               intphi=Int_t(binphi);
 408                             else
 409                               intphi=Int_t(binphi+0.5);
 410
 411                             //printf("Point added at %d %d %d\n",inttheta,intphi,intomega);
 412                             point[inttheta][intphi][intomega]+=1;
 413                             //printf("Omega stored:%d\n",intomega);
 414                             Points->Fill(inttheta,intphi,intomega,(float) 1);
 415                             ThetaPhi->Fill(inttheta,intphi,(float) 1);
 416                             OmegaTheta->Fill(inttheta,intomega,(float) 1);
 417                             OmegaPhi->Fill(intphi,intomega,(float) 1);
 418                             //printf("Filling at %d %d %d\n",Int_t(theta*kDimensionTheta/kMaxTheta),Int_t(phi*kDimensionPhi/kMaxPhi),Int_t(omega*kDimensionOmega/kMaxOmega));
 419                           }
 420                         //if(omega<kMaxOmega)point[Int_t(theta)][Int_t(phi)][Int_t(omega)]+=1;
 421                       }
 422                   }
 423               }
 424           }
 425         //printf("Used %d digits for theta %3.1f\n",counter1, theta*180/kPi);
 426       }
 427
 428     meanradius=meanradius/counter;
 429     printf("Mean radius:%f, counter:%d\n",meanradius,counter);
 430     rechit[5]=meanradius;
 431     printf("Used %d digits\n",counter1);
 432     //printf("\n");
 433
 434     if(nev<20)
 435       {
 436         if(nev==0)
 437           {
 438             fc1->cd(1);
 439             Points->Draw();
 440             fc1->cd(2);
 441             ThetaPhi->Draw();
 442             fc1->cd(3);
 443             OmegaTheta->Draw();
 444             fc1->cd(4);
 445             OmegaPhi->Draw();
 446             fc3->cd();
 447             DigitsXY->Draw();
 448           }
 449         else
 450           {
 451             //fc1->cd(1);
 452             //Points->Draw("same");
 453             //fc1->cd(2);
 454             //ThetaPhi->Draw("same");
 455             //fc1->cd(3);
 456             //OmegaTheta->Draw("same");
 457             //fc1->cd(4);
 458             //OmegaPhi->Draw("same");
 459           }
 460       }
 461
 462
 463     //SPOT execute twice
 464     for(Int_t s=0;s<kSpot;s++)
 465       {
 466         printf("     Applying Spot algorithm, pass %d\n", s);
 467
 468         //buffer copy
 469         for(i=0;i<=kDimensionTheta;i++)
 470           {
 471             for(j=0;j<=kDimensionPhi;j++)
 472               {
 473                 for(k=0;k<=kDimensionOmega;k++)
 474                   {
 475                     point1[i][j][k]=point[i][j][k];
 476                   }
 477               }
 478           }
 479
 480         //SPOT algorithm
 481         for(i=1;i<kDimensionTheta-1;i++)
 482           {
 483             for(j=1;j<kDimensionPhi-1;j++)
 484               {
 485                 for(k=1;k<kDimensionOmega-1;k++)
 486                   {
 487                     if((point[i][k][j]>point[i-1][k][j])&&(point[i][k][j]>point[i+1][k][j])&&
 488                        (point[i][k][j]>point[i][k-1][j])&&(point[i][k][j]>point[i][k+1][j])&&
 489                        (point[i][k][j]>point[i][k][j-1])&&(point[i][k][j]>point[i][k][j+1]))
 490                       {
 491                         //cout<<"SPOT"<<endl;
 492                         //Execute SPOT on point
 493                         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]));
 494                         point1[i-1][k][j]=Int_t(SPOTp*point[i-1][k][j]);
 495                         point1[i+1][k][j]=Int_t(SPOTp*point[i+1][k][j]);
 496                         point1[i][k-1][j]=Int_t(SPOTp*point[i][k-1][j]);
 497                         point1[i][k+1][j]=Int_t(SPOTp*point[i][k+1][j]);
 498                         point1[i][k][j-1]=Int_t(SPOTp*point[i][k][j-1]);
 499                         point1[i][k][j+1]=Int_t(SPOTp*point[i][k][j+1]);
 500                       }
 501                   }
 502               }
 503           }
 504
 505         //copy from buffer copy
 506         counter1=0;
 507         for(i=1;i<kDimensionTheta;i++)
 508           {
 509             for(j=1;j<kDimensionPhi;j++)
 510               {
 511                 for(k=1;k<kDimensionOmega;k++)
 512                   {
 513                     point[i][j][k]=point1[i][j][k];
 514                     if(nev<20)
 515                       {
 516                         if(s==kSpot-1)
 517                           {
 518                             if(point1[i][j][k] != 0)
 519                               {
 520                                 SpotPoints->Fill(i,j,k,(float) point1[i][j][k]);
 521                                 //printf("Random number %f\n",random->Rndm(2));
 522                                 //if(random->Rndm() < .2)
 523                                   //{
 524                                 SpotThetaPhi->Fill(i,j,(float) point1[i][j][k]);
 525                                 SpotOmegaTheta->Fill(i,k,(float) point1[i][j][k]);
 526                                 SpotOmegaPhi->Fill(j,k,(float) point1[i][j][k]);
 527                                     counter1++;
 528                                   //}
 529                                 //printf("Filling at %d %d %d value %f\n",i,j,k,(float) point1[i][j][k]);
 530                               }
 531                           }
 532                       }
 533                     //if(point1[i][j][k] != 0)
 534                       //printf("Last transfer point: %d, point1, %d\n",point[i][j][k],point1[i][j][k]);
 535                   }
 536               }
 537           }
 538       }
 539
 540     //printf("Filled %d cells\n",counter1);
 541
 542     if(nev<20)
 543       {
 544         if(nev==0)
 545           {
 546             fc2->cd(1);
 547             SpotPoints->Draw();
 548             fc2->cd(2);
 549             SpotThetaPhi->Draw();
 550             fc2->cd(3);
 551             SpotOmegaTheta->Draw();
 552             fc2->cd(4);
 553             SpotOmegaPhi->Draw();
 554           }
 555         else
 556           {
 557             //fc2->cd(1);
 558             //SpotPoints->Draw("same");
 559             //fc2->cd(2);
 560             //SpotThetaPhi->Draw("same");
 561             //fc2->cd(3);
 562             //SpotOmegaTheta->Draw("same");
 563             //fc2->cd(4);
 564             //SpotOmegaPhi->Draw("same");
 565           }
 566       }
 567
 568
 569     //Identification is equivalent to maximum determination
 570     max=0;maxi=0;maxj=0;maxk=0;
 571
 572     printf("     Proceeding to identification");
 573
 574     for(i=0;i<kDimensionTheta;i++)
 575       for(j=0;j<kDimensionPhi;j++)
 576         for(k=0;k<kDimensionOmega;k++)
 577             if(point[i][j][k]>max)
 578               {
 579                 //cout<<"maxi="<<i*90/dimension<<" maxj="<<j*90/dimension<<" maxk="<<k*kMaxOmega/dimension*180/kPi<<" max="<<max<<endl;
 580                 maxi=i;maxj=j;maxk=k;
 581                 max=point[i][j][k];
 582                 printf(".");
 583                 //printf("Max Omega %d, Max Theta %d, Max Phi %d (%d counts)\n",maxk,maxi,maxj,max);
 584               }
 585     printf("\n");
 586
 587     Float_t FinalOmega = maxk*(kMaxOmega-kMinOmega)/kDimensionOmega;
 588     Float_t FinalTheta = maxi*kMaxTheta/kDimensionTheta;
 589     Float_t FinalPhi = maxj*kMaxPhi/kDimensionPhi;
 590
 591     FinalOmega += kMinOmega;
 592
 593     //printf("Detected angle for height %3.1f and for center %3.1f %3.1f:%f\n",h,cx,cy,maxk*kPi/(kDimensionTheta*4));
 594     printf("     Indentified angles: cerenkov - %f, theta - %3.1f, phi - %3.1f (%f activation)\n", FinalOmega, FinalTheta*180/kPi, FinalPhi*180/kPi, max);
 595     //printf("Detected angle for height %3.1f and for center %3.1f %3.1f:%f\n",kHeight,cx,cy,maxk);
 596
 597     //fscanf(omegas,"%f",&realomega);
 598     //fscanf(thetas,"%f",&realtheta);
 599     //printf("Real Omega: %f",realomega);
 600     //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;
 601
 602     //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));
 603
 604     /*for(j=0;j<np;j++)
 605       pointpp(maxj*90/kDimensionTheta,maxi*90/kDimensionPhi,maxk*kMaxOmega/kDimensionOmega*180/kPi,cx,cy);//Generates a point on the elipse*/
 606
 607
 608     //Start filling rec. hits
 609
 610     rechit[0] = FinalTheta;
 611     rechit[1] = 90*kPi/180 + FinalPhi;
 612     rechit[2] = FinalOmega;
 613     rechit[3] = cx;
 614     rechit[4] = cy;
 615
 616     //CreatePoints(FinalTheta, 270*kPi/180 + FinalPhi, FinalOmega, kHeight);
 617
 618     //printf ("track %d, theta %f, phi %f, omega %f\n\n\n",track,rechit[0],rechit[1],rechit[2]);
 619
 620     // fill rechits
 621     pRICH->AddRecHit3D(nch-1,rechit);
 622     //printf("rechit %f %f %f %f %f\n",rechit[0],rechit[1],rechit[2],rechit[3],rechit[4]);
 623     //printf("Chamber:%d",nch);
 624   }
 625   //printf("\n\n\n\n");
 626   gAlice->TreeR()->Fill();
 627   TClonesArray *fRec;
 628   for (i=0;i<kNCH;i++) {
 629     fRec=pRICH->RecHitsAddress3D(i);
 630     int ndig=fRec->GetEntriesFast();
 631     printf ("Chamber %d, rings %d\n",i+1,ndig);
 632   }
 633   pRICH->ResetRecHits3D();
 634
 635   free_i3tensor(point,0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 636   free_i3tensor(point1,0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 637 }
 638
 639
 640
 641 Float_t AliRICHDetect:: Area(Float_t theta,Float_t omega)
 642 {
 643
 644 //
 645 // Calculates area of an ellipse for given incidence angles
 646
 647
 648     Float_t area;
 649     const Float_t kHeight=9.25;                       //Distance from Radiator to Pads in pads
 650
 651     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);
 652
 653     return (area);
 654 }
 655
 656
 657 Int_t ***AliRICHDetect::i3tensor(long nrl, long nrh, long ncl, long nch, long ndl, long ndh)
 658 // allocate a Int_t 3tensor with range t[nrl..nrh][ncl..nch][ndl..ndh]
 659 {
 660   long i,j,nrow=nrh-nrl+1,ncol=nch-ncl+1,ndep=ndh-ndl+1;
 661   Int_t ***t;
 662
 663   int NR_END=1;
 664
 665   // allocate pointers to pointers to rows
 666   t=(Int_t ***) malloc((size_t)((nrow+NR_END)*sizeof(Int_t**)));
 667   if (!t) printf("allocation failure 1 in f3tensor()");
 668   t += NR_END;
 669   t -= nrl;
 670
 671   // allocate pointers to rows and set pointers to them
 672   t[nrl]=(Int_t **) malloc((size_t)((nrow*ncol+NR_END)*sizeof(Int_t*)));
 673   if (!t[nrl]) printf("allocation failure 2 in f3tensor()");
 674   t[nrl] += NR_END;
 675   t[nrl] -= ncl;
 676
 677   // allocate rows and set pointers to them
 678   t[nrl][ncl]=(Int_t *) malloc((size_t)((nrow*ncol*ndep+NR_END)*sizeof(Int_t)));
 679   if (!t[nrl][ncl]) printf("allocation failure 3 in f3tensor()");
 680   t[nrl][ncl] += NR_END;
 681   t[nrl][ncl] -= ndl;
 682
 683   for(j=ncl+1;j<=nch;j++) t[nrl][j]=t[nrl][j-1]+ndep;
 684   for(i=nrl+1;i<=nrh;i++) {
 685     t[i]=t[i-1]+ncol;
 686     t[i][ncl]=t[i-1][ncl]+ncol*ndep;
 687     for(j=ncl+1;j<=nch;j++) t[i][j]=t[i][j-1]+ndep;
 688   }
 689
 690   // return pointer to array of pointers to rows
 691   return t;
 692 }
 693
 694 void AliRICHDetect::free_i3tensor(int ***t, long nrl, long nrh, long ncl, long nch,long ndl, long ndh)
 695 // free a Int_t f3tensor allocated by i3tensor()
 696 {
 697   int NR_END=1;
 698
 699   free((char*) (t[nrl][ncl]+ndl-NR_END));
 700   free((char*) (t[nrl]+ncl-NR_END));
 701   free((char*) (t+nrl-NR_END));
 702 }
 703
 704
 705 Float_t AliRICHDetect:: SnellAngle(Float_t iangle)
 706 {
 707
 708 // Compute the Snell angle
 709
 710   Float_t nfreon  = 1.295;
 711   Float_t nquartz = 1.585;
 712   Float_t ngas = 1;
 713
 714   Float_t sinrangle;
 715   Float_t rangle;
 716   Float_t a1, a2;
 717
 718   a1=nfreon/nquartz;
 719   a2=nquartz/ngas;
 720
 721   sinrangle = a1*a2*sin(iangle);
 722
 723   if(sinrangle>1.) {
 724      rangle = 999.;
 725      return rangle;
 726   }
 727
 728   rangle = asin(sinrangle);
 729   return rangle;
 730 }
 731
 732 Float_t AliRICHDetect:: InvSnellAngle(Float_t rangle)
 733 {
 734
 735 // Compute the inverse Snell angle
 736
 737   Float_t nfreon  = 1.295;
 738   Float_t nquartz = 1.585;
 739   Float_t ngas = 1;
 740
 741   Float_t siniangle;
 742   Float_t iangle;
 743   Float_t a1,a2;
 744
 745   a1=nfreon/nquartz;
 746   a2=nquartz/ngas;
 747
 748   siniangle = sin(rangle)/(a1*a2);
 749   iangle = asin(siniangle);
 750
 751   if(siniangle>1.) {
 752      iangle = 999.;
 753      return iangle;
 754   }
 755
 756   iangle = asin(siniangle);
 757   return iangle;
 758 }
 759
 760
 761
 762 //________________________________________________________________________________
 763 void AliRICHDetect::CreatePoints(Float_t theta, Float_t phi, Float_t omega, Float_t h)
 764 {
 765
 766   // Create points along the ellipse equation
 767
 768   Int_t s1,s2;
 769   Float_t fiducial=h*TMath::Tan(omega+theta), l=h/TMath::Cos(theta), xtrial, y=0, c0, c1, c2;
 770   //TRandom *random=new TRandom();
 771
 772   static TH2F *REllipse = new TH2F("REllipse","Reconstructed ellipses",150,-25,25,150,-25,25);
 773
 774   for(Float_t i=0;i<1000;i++)
 775     {
 776
 777       Float_t counter=0;
 778
 779       c0=0;c1=0;c2=0;
 780       while((c1*c1-4*c2*c0)<=0 && counter<1000)
 781         {
 782           //Choose which side to go...
 783           if(i>250 && i<750) s1=1;
 784           //if (gRandom->Rndm(1)>.5) s1=1;
 785           else s1=-1;
 786           //printf("s1:%d\n",s1);
 787           //Trial a y
 788           y=s1*i*gRandom->Rndm(Int_t(fiducial/50));
 789           //printf("Fiducial %f  for omega:%f theta:%f phi:%f\n",fiducial,omega,theta,fphi);
 790           Float_t alfa1=theta;
 791           Float_t theta1=phi;
 792           Float_t omega1=omega;
 793
 794           //Solve the eq for a trial x
 795           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);
 796           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);
 797           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);
 798           //cout<<"Trial: y="<<y<<"c0="<<c0<<" c1="<<c1<<" c2="<<c2<<endl;
 799           //printf("Result:%f\n\n",c1*c1-4*c2*c0);
 800           //i+=.01;
 801           counter +=1;
 802         }
 803
 804       if (counter>=1000)
 805         y=0;
 806
 807       //Choose which side to go...
 808       //if(gRandom->Rndm(1)>.5) s=1;
 809       //else s=-1;
 810       if(i>500) s2=1;
 811       //if (gRandom->Rndm(1)>.5) s2=1;
 812       else s2=-1;
 813       xtrial=(-c1+s2*TMath::Sqrt(c1*c1-4*c2*c0))/(2*c2);
 814       //cout<<"x="<<xtrial<<" y="<<cy+y<<endl;
 815       //printf("Coordinates: %f %f\n",xtrial,fCy+y);
 816
 817       REllipse->Fill(xtrial,y);
 818
 819       //printf("Coordinates: %f %f %f\n",vectorGlob[0],vectorGlob[1],vectorGlob[2]);
 820     }
 821
 822   fc3->cd(2);
 823   REllipse->Draw();
 824 }