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 1.14  2001/05/14 13:25:54  hristov
  19   stdlib.h included (for Alpha)
  20
  21   Revision 1.13  2001/05/10 12:26:31  jbarbosa
  22   Totally reworked version of reconstruction algorithm.
  23
  24   Revision 1.12  2001/02/27 22:15:03  jbarbosa
  25   Removed compiler warning.
  26
  27   Revision 1.11  2001/02/27 15:21:46  jbarbosa
  28   Transition to SDigits.
  29
  30   Revision 1.10  2001/02/13 20:39:06  jbarbosa
  31   Changes to make it work with new IO.
  32
  33   Revision 1.9  2001/01/22 21:39:11  jbarbosa
  34   Several tune-ups
  35
  36   Revision 1.8  2000/11/15 15:52:53  jbarbosa
  37   Turned on spot algorithm.
  38
  39   Revision 1.7  2000/11/01 15:37:05  jbarbosa
  40   Updated to use its own rec. point object.
  41
  42   Revision 1.6  2000/10/02 21:28:12  fca
  43   Removal of useless dependecies via forward declarations
  44
  45   Revision 1.5  2000/06/30 16:30:28  dibari
  46   Disabled writing to rechits.
  47
  48   Revision 1.4  2000/06/15 15:46:59  jbarbosa
  49   Corrected compilation errors on HP-UX (replaced pow with TMath::Power)
  50
  51   Revision 1.3  2000/06/13 13:15:41  jbarbosa
  52   Still some code cleanup done (variable names)
  53
  54   Revision 1.2  2000/06/12 15:19:30  jbarbosa
  55   Cleaned up version.
  56
  57   Revision 1.1  2000/04/19 13:05:14  morsch
  58   J. Barbosa's spot reconstruction algorithm.
  59
  60 */
  61
  62 #include <stdlib.h>
  63
  64
  65 #include "AliRICH.h"
  66 #include "AliRICHPoints.h"
  67 #include "AliRICHDetect.h"
  68 #include "AliRICHHit.h"
  69 #include "AliRICHDigit.h"
  70 #include "AliRICHSegmentationV0.h"
  71 #include "AliRun.h"
  72 #include "TParticle.h"
  73 #include "TTree.h"
  74 #include "TMath.h"
  75 #include "TRandom.h"
  76 #include "TH3.h"
  77 #include "TH2.h"
  78 #include "TCanvas.h"
  79
  80 #include "malloc.h"
  81
  82
  83 ClassImp(AliRICHDetect)
  84 //___________________________________________
  85 AliRICHDetect::AliRICHDetect() : TObject()
  86 {
  87
  88 // Default constructor
  89
  90   fc1 = 0;
  91   fc2 = 0;
  92   fc3 = 0;
  93
  94 }
  95
  96 //___________________________________________
  97 AliRICHDetect::AliRICHDetect(const char *name, const char *title)
  98     : TObject()
  99 {
 100
 101
 102   fc1= new TCanvas("c1","Reconstructed points",50,50,300,350);
 103   fc1->Divide(2,2);
 104   fc2= new TCanvas("c2","Reconstructed points after SPOT",50,50,300,350);
 105   fc2->Divide(2,2);
 106   fc3= new TCanvas("c3","Used Digits",50,50,300,350);
 107   //fc3->Divide(2,1);
 108
 109 }
 110
 111 //___________________________________________
 112 AliRICHDetect::~AliRICHDetect()
 113 {
 114
 115 // Destructor
 116
 117 }
 118
 119
 120 void AliRICHDetect::Detect(Int_t nev)
 121 {
 122
 123 //
 124 // Detection algorithm
 125
 126
 127   //printf("Detection started!\n");
 128   Float_t omega,omega1,theta1,steptheta,stepphi,x,y,z,cx,cy,l,aux1,aux2,aux3,max,radius=0,meanradius=0;
 129   Int_t maxi,maxj,maxk;
 130   //Float_t theta,phi,realomega,realtheta;
 131   Float_t binomega, bintheta, binphi;
 132   Int_t intomega, inttheta, intphi;
 133   Int_t i,j,k;
 134
 135   AliRICH *pRICH  = (AliRICH*)gAlice->GetDetector("RICH");
 136   AliRICHSegmentationV0*  segmentation;
 137   AliRICHChamber*       iChamber;
 138   AliRICHGeometry*  geometry;
 139
 140   iChamber = &(pRICH->Chamber(0));
 141   segmentation=(AliRICHSegmentationV0*) iChamber->GetSegmentationModel(0);
 142   geometry=iChamber->GetGeometryModel();
 143
 144
 145   //const Float_t Noise_Level=0;                       //Noise Level in percentage of mesh points
 146   //const Float_t t=0.6;                               //Softening of Noise Correction (factor)
 147
 148   const Float_t kPi=TMath::Pi();
 149
 150   const Float_t kHeight=geometry->GetRadiatorToPads(); //Distance from Radiator to Pads in centimeters
 151   //printf("Distance to Pads:%f\n",kHeight);
 152
 153   const Int_t kSpot=0;                                 //number of passes with spot algorithm
 154
 155   const Int_t kDimensionTheta=30;                      //Matrix dimension for angle Detection
 156   const Int_t kDimensionPhi=45;
 157   const Int_t kDimensionOmega=100;
 158
 159   const Float_t SPOTp=1;                              //Percentage of spot action
 160   const Float_t kMinOmega=20*kPi/180;
 161   const Float_t kMaxOmega=70*kPi/180;                 //Maximum Cherenkov angle to identify
 162   const Float_t kMinTheta=0;
 163   const Float_t kMaxTheta=15*kPi/180;
 164   //const Float_t kMaxTheta=0.1;
 165   const Float_t kMinPhi=0;
 166   const Float_t kMaxPhi=360*kPi/180;
 167
 168
 169   Float_t kCorr=0.61;                              //Correction factor, accounting for aberration, refractive index, etc.
 170   //const Float_t kCorr=.9369;                        //from 0 incidence
 171   //const Float_t kCorr=1;
 172
 173   //TRandom* random=0;
 174
 175   Float_t rechit[6];                                 //Reconstructed point data
 176
 177
 178
 179   //printf("Creating matrices\n");
 180   //Float_t point[kDimensionTheta][kDimensionPhi][kDimensionOmega];
 181   //Float_t point1[kDimensionTheta][kDimensionPhi][kDimensionOmega];
 182   //printf("Created matrices\n");
 183
 184   Int_t ***point = i3tensor(0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 185   Int_t ***point1 = i3tensor(0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 186
 187   //Int_t **point  = new Int_t[kDimensionTheta][kDimensionPhi][kDimensionOmega];
 188   //Int_t **point1 = new Int_t[kDimensionTheta][kDimensionPhi][kDimensionOmega];
 189
 190   steptheta=(kMaxTheta-kMinTheta)/kDimensionTheta;
 191   stepphi=(kMaxPhi-kMinPhi)/kDimensionPhi;
 192
 193   static TH3F *Points = new TH3F("Points","Reconstructed points 3D",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 194   static TH2F *ThetaPhi = new TH2F("ThetaPhi","Theta-Phi projection",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi);
 195   static TH2F *OmegaTheta = new TH2F("OmegaTheta","Omega-Theta projection",kDimensionTheta,0,kDimensionTheta,kDimensionOmega,0,kDimensionOmega);
 196   static TH2F *OmegaPhi = new TH2F("OmegaPhi","Omega-Phi projection",kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 197   static TH3F *SpotPoints = new TH3F("Points","Reconstructed points 3D, spot",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 198   static TH2F *SpotThetaPhi = new TH2F("ThetaPhi","Theta-Phi projection, spot",kDimensionTheta,0,kDimensionTheta,kDimensionPhi,0,kDimensionPhi);
 199   static TH2F *SpotOmegaTheta = new TH2F("OmegaTheta","Omega-Theta projection, spot",kDimensionTheta,0,kDimensionTheta,kDimensionOmega,0,kDimensionOmega);
 200   static TH2F *SpotOmegaPhi = new TH2F("OmegaPhi","Omega-Phi projection, spot",kDimensionPhi,0,kDimensionPhi,kDimensionOmega,0,kDimensionOmega);
 201   static TH2F *DigitsXY = new TH2F("DigitsXY","Pads used for reconstruction",150,-25,25,150,-25,25);
 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
 221   Int_t ntracks = (Int_t)gAlice->TreeH()->GetEntries();
 222   //Int_t ntrks = gAlice->GetNtrack();
 223
 224   Float_t trackglob[3];
 225   Float_t trackloc[3];
 226
 227   //printf("Area de uma elipse com teta 0 e Omega 45:%f",Area(0,45));
 228
 229   Int_t track;
 230
 231   for (track=0; track<ntracks;track++) {
 232     gAlice->ResetHits();
 233     gAlice->TreeH()->GetEvent(track);
 234     TClonesArray *pHits  = pRICH->Hits();
 235     if (pHits == 0) return;
 236     Int_t nhits = pHits->GetEntriesFast();
 237     if (nhits == 0) continue;
 238     //Int_t nent=(Int_t)gAlice->TreeD()->GetEntries();
 239     gAlice->TreeD()->GetEvent(0);
 240     AliRICHHit *mHit = 0;
 241     AliRICHDigit *points = 0;
 242     //Int_t npoints=0;
 243
 244     Int_t counter=0, counter1=0;
 245     //Initialization
 246     for(i=0;i<kDimensionTheta;i++)
 247       {
 248         for(j=0;j<kDimensionPhi;j++)
 249           {
 250             for(k=0;k<kDimensionOmega;k++)
 251               {
 252                 counter++;
 253                 point[i][j][k]=0;
 254                 //printf("Dimensions theta:%d, phi:%d, omega:%d",kDimensionTheta,kDimensionPhi,kDimensionOmega);
 255                 //printf("Resetting %d %d %d, time %d\n",i,j,k,counter);
 256                 //-Noise_Level*(Area(i*kPi/(18*dimension),k*kMaxOmega/dimension)-Area((i-1)*kPi/(18*dimension),(k-1)*kMaxOmega/dimension));
 257                 //printf("n-%f",-Noise_Level*(Area(i*kPi/(18*dimension),k*kMaxOmega/dimension)-Area((i-1)*kPi/(18*dimension),(k-1)*kMaxOmega/dimension)));
 258               }
 259           }
 260       }
 261     mHit = (AliRICHHit*) pHits->UncheckedAt(0);
 262     //printf("Aqui vou eu\n");
 263     Int_t nch  = mHit->fChamber;
 264     //printf("Aqui fui eu\n");
 265     trackglob[0] = mHit->X();
 266     trackglob[1] = mHit->Y();
 267     trackglob[2] = mHit->Z();
 268
 269     printf("Chamber processed:%d\n",nch);
 270
 271     printf("Reconstructing particle at (global coordinates): %3.1f %3.1f %3.1f,\n",trackglob[0],trackglob[1],trackglob[2]);
 272
 273     iChamber = &(pRICH->Chamber(nch-1));
 274
 275     //printf("Nch:%d\n",nch);
 276
 277     iChamber->GlobaltoLocal(trackglob,trackloc);
 278
 279     printf("Reconstructing particle at (local coordinates) : %3.1f %3.1f %3.1f\n",trackloc[0],trackloc[1],trackloc[2]);
 280
 281
 282     iChamber->LocaltoGlobal(trackloc,trackglob);
 283
 284     //printf("Transformation 2: %3.1f %3.1f %3.1f\n",trackglob[0],trackglob[1],trackglob[2]);
 285
 286     cx=trackloc[0];
 287     cy=trackloc[2];
 288
 289
 290     TClonesArray *pDigits = pRICH->DigitsAddress(nch-1);
 291     Int_t ndigits = pDigits->GetEntriesFast();
 292
 293     //printf("Got %d digits\n",ndigits);
 294
 295     counter=0;
 296     printf("Starting calculations\n");
 297     for(Float_t theta=0;theta<kMaxTheta;theta+=steptheta)
 298       {
 299         //printf(".");
 300         for(Float_t phi=0;phi<=kMaxPhi;phi+=stepphi)
 301           {
 302             //printf("Phi:%3.1f\n", phi*180/kPi);
 303             counter1=0;
 304             for (Int_t dig=0;dig<ndigits;dig++)
 305               {
 306                 points=(AliRICHDigit*) pDigits->UncheckedAt(dig);
 307                 segmentation->GetPadC(points->fPadX, points->fPadY,x, y, z);
 308                 x=x-cx;
 309                 y=y-cy;
 310                 radius=TMath::Sqrt(TMath::Power(x,2)+TMath::Power(y,2));
 311
 312                 if(radius>4)
 313                   {
 314                     //if(theta==0 && phi==0)
 315                       //{
 316                         //printf("Radius: %f, Max Radius: %f\n",radius,kCorr*kHeight*tan(theta+kMaxOmega)*3/4);
 317                         meanradius+=radius;
 318                         counter++;
 319                       //}
 320
 321                     if (radius<2*kHeight*tan(theta+kMaxOmega)*3/4)
 322                       {
 323
 324                         if(phi==0)
 325                           {
 326                             //printf("Radius: %f, Max Radius: %f\n",radius,2*kHeight*tan(theta+kMaxOmega)*3/4);
 327                             //printf("Loaded digit %d with coordinates x:%f, y%f\n",dig,x,y);
 328                             //printf("Using digit %d, for theta %f\n",dig,theta);
 329                           }
 330
 331                         counter1++;
 332
 333                         l=kHeight/cos(theta);
 334
 335                         //x=x*kCorr;
 336                         //y=y*kCorr;
 337                         /*if(SnellAngle(theta+omega)<999)
 338                           {
 339                             //printf("(Angle)/(Snell angle):%f\n",(theta+omega)/SnellAngle(theta+omega));
 340                             x=x*(theta+omega)/SnellAngle(theta+omega);
 341                             y=y*(theta+omega)/SnellAngle(theta+omega);
 342                           }
 343                         else
 344                           {
 345                             x=0;
 346                             y=0;
 347                           }*/
 348
 349                         //main calculation
 350
 351                         DigitsXY->Fill(x,y,(float) 1);
 352
 353                         theta1=SnellAngle(theta)*1.5;
 354
 355                         aux1=-y*sin(phi)+x*cos(phi);
 356                         aux2=y*cos(phi)+x*sin(phi);
 357                         aux3=( TMath::Power(aux1,2)+TMath::Power(cos(theta1)*aux2 ,2))/TMath::Power(sin(theta1)*aux2+l,2);
 358                         omega=atan(sqrt(aux3));
 359
 360                         //omega is distorted, theta1 is distorted
 361
 362                         if(InvSnellAngle(theta+omega)<999)
 363                           {
 364                             omega1=InvSnellAngle(omega+theta1) - theta;
 365                             //theta1=InvSnellAngle(omega+theta) - omega1;
 366                             //omega1=kCorr*omega;
 367
 368                             kCorr=InvSnellAngle(omega+theta)/(omega+theta);
 369                             theta1=kCorr*theta/1.4;
 370                             //if(phi==0)
 371                               //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);
 372                           }
 373                         else
 374                           {
 375                             omega1=0;
 376                             theta1=0;
 377                           }
 378
 379                         //printf("Omega:%f\n",omega);
 380
 381
 382                         //if(SnellAngle(theta+omega)<999)
 383                           //printf("(Angle)/(Snell angle):%f\n",(theta+omega)/SnellAngle(theta+omega));
 384                         if(theta==0 && phi==0)
 385                           {
 386                             //printf("Omega: %f Corrected Omega: %f\n",omega, omega/kCorr);
 387                             //omega=omega/kCorr;
 388                           }
 389
 390                         //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;
 391                         //{Int_t lixo;cin>>lixo;}
 392                         if(omega1<kMaxOmega && omega1>kMinOmega)
 393                           {
 394                             //printf("Omega found:%f\n",omega);
 395                             omega1=omega1-kMinOmega;
 396
 397                             //printf("Omega: %f Theta: %3.1f Phi:%3.1f\n",omega, theta*180/kPi, phi*180/kPi);
 398
 399                             bintheta=theta1*kDimensionTheta/kMaxTheta;
 400                             binphi=phi*kDimensionPhi/kMaxPhi;
 401                             binomega=omega1*kDimensionOmega/(kMaxOmega-kMinOmega);
 402
 403                             if(Int_t(bintheta+0.5)==Int_t(bintheta))
 404                               inttheta=Int_t(bintheta);
 405                             else
 406                               inttheta=Int_t(bintheta+0.5);
 407
 408                             if(Int_t(binomega+0.5)==Int_t(binomega))
 409                               intomega=Int_t(binomega);
 410                             else
 411                               intomega=Int_t(binomega+0.5);
 412
 413                             if(Int_t(binphi+0.5)==Int_t(binphi))
 414                               intphi=Int_t(binphi);
 415                             else
 416                               intphi=Int_t(binphi+0.5);
 417
 418                             //printf("Point added at %d %d %d\n",inttheta,intphi,intomega);
 419                             point[inttheta][intphi][intomega]+=1;
 420                             //printf("Omega stored:%d\n",intomega);
 421                             Points->Fill(inttheta,intphi,intomega,(float) 1);
 422                             ThetaPhi->Fill(inttheta,intphi,(float) 1);
 423                             OmegaTheta->Fill(inttheta,intomega,(float) 1);
 424                             OmegaPhi->Fill(intphi,intomega,(float) 1);
 425                             //printf("Filling at %d %d %d\n",Int_t(theta*kDimensionTheta/kMaxTheta),Int_t(phi*kDimensionPhi/kMaxPhi),Int_t(omega*kDimensionOmega/kMaxOmega));
 426                           }
 427                         //if(omega<kMaxOmega)point[Int_t(theta)][Int_t(phi)][Int_t(omega)]+=1;
 428                       }
 429                   }
 430               }
 431           }
 432         //printf("Used %d digits for theta %3.1f\n",counter1, theta*180/kPi);
 433       }
 434
 435     meanradius=meanradius/counter;
 436     printf("Mean radius:%f, counter:%d\n",meanradius,counter);
 437     rechit[5]=meanradius;
 438     printf("Used %d digits\n",counter1);
 439     //printf("\n");
 440
 441     if(nev<20)
 442       {
 443         if(nev==0)
 444           {
 445             fc1->cd(1);
 446             Points->Draw();
 447             fc1->cd(2);
 448             ThetaPhi->Draw();
 449             fc1->cd(3);
 450             OmegaTheta->Draw();
 451             fc1->cd(4);
 452             OmegaPhi->Draw();
 453             fc3->cd();
 454             DigitsXY->Draw();
 455           }
 456         else
 457           {
 458             //fc1->cd(1);
 459             //Points->Draw("same");
 460             //fc1->cd(2);
 461             //ThetaPhi->Draw("same");
 462             //fc1->cd(3);
 463             //OmegaTheta->Draw("same");
 464             //fc1->cd(4);
 465             //OmegaPhi->Draw("same");
 466           }
 467       }
 468
 469
 470     //SPOT execute twice
 471     for(Int_t s=0;s<kSpot;s++)
 472       {
 473         printf("     Applying Spot algorithm, pass %d\n", s);
 474
 475         //buffer copy
 476         for(i=0;i<=kDimensionTheta;i++)
 477           {
 478             for(j=0;j<=kDimensionPhi;j++)
 479               {
 480                 for(k=0;k<=kDimensionOmega;k++)
 481                   {
 482                     point1[i][j][k]=point[i][j][k];
 483                   }
 484               }
 485           }
 486
 487         //SPOT algorithm
 488         for(i=1;i<kDimensionTheta-1;i++)
 489           {
 490             for(j=1;j<kDimensionPhi-1;j++)
 491               {
 492                 for(k=1;k<kDimensionOmega-1;k++)
 493                   {
 494                     if((point[i][k][j]>point[i-1][k][j])&&(point[i][k][j]>point[i+1][k][j])&&
 495                        (point[i][k][j]>point[i][k-1][j])&&(point[i][k][j]>point[i][k+1][j])&&
 496                        (point[i][k][j]>point[i][k][j-1])&&(point[i][k][j]>point[i][k][j+1]))
 497                       {
 498                         //cout<<"SPOT"<<endl;
 499                         //Execute SPOT on point
 500                         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]));
 501                         point1[i-1][k][j]=Int_t(SPOTp*point[i-1][k][j]);
 502                         point1[i+1][k][j]=Int_t(SPOTp*point[i+1][k][j]);
 503                         point1[i][k-1][j]=Int_t(SPOTp*point[i][k-1][j]);
 504                         point1[i][k+1][j]=Int_t(SPOTp*point[i][k+1][j]);
 505                         point1[i][k][j-1]=Int_t(SPOTp*point[i][k][j-1]);
 506                         point1[i][k][j+1]=Int_t(SPOTp*point[i][k][j+1]);
 507                       }
 508                   }
 509               }
 510           }
 511
 512         //copy from buffer copy
 513         counter1=0;
 514         for(i=1;i<kDimensionTheta;i++)
 515           {
 516             for(j=1;j<kDimensionPhi;j++)
 517               {
 518                 for(k=1;k<kDimensionOmega;k++)
 519                   {
 520                     point[i][j][k]=point1[i][j][k];
 521                     if(nev<20)
 522                       {
 523                         if(s==kSpot-1)
 524                           {
 525                             if(point1[i][j][k] != 0)
 526                               {
 527                                 SpotPoints->Fill(i,j,k,(float) point1[i][j][k]);
 528                                 //printf("Random number %f\n",random->Rndm(2));
 529                                 //if(random->Rndm() < .2)
 530                                   //{
 531                                 SpotThetaPhi->Fill(i,j,(float) point1[i][j][k]);
 532                                 SpotOmegaTheta->Fill(i,k,(float) point1[i][j][k]);
 533                                 SpotOmegaPhi->Fill(j,k,(float) point1[i][j][k]);
 534                                     counter1++;
 535                                   //}
 536                                 //printf("Filling at %d %d %d value %f\n",i,j,k,(float) point1[i][j][k]);
 537                               }
 538                           }
 539                       }
 540                     //if(point1[i][j][k] != 0)
 541                       //printf("Last transfer point: %d, point1, %d\n",point[i][j][k],point1[i][j][k]);
 542                   }
 543               }
 544           }
 545       }
 546
 547     //printf("Filled %d cells\n",counter1);
 548
 549     if(nev<20)
 550       {
 551         if(nev==0)
 552           {
 553             fc2->cd(1);
 554             SpotPoints->Draw();
 555             fc2->cd(2);
 556             SpotThetaPhi->Draw();
 557             fc2->cd(3);
 558             SpotOmegaTheta->Draw();
 559             fc2->cd(4);
 560             SpotOmegaPhi->Draw();
 561           }
 562         else
 563           {
 564             //fc2->cd(1);
 565             //SpotPoints->Draw("same");
 566             //fc2->cd(2);
 567             //SpotThetaPhi->Draw("same");
 568             //fc2->cd(3);
 569             //SpotOmegaTheta->Draw("same");
 570             //fc2->cd(4);
 571             //SpotOmegaPhi->Draw("same");
 572           }
 573       }
 574
 575
 576     //Identification is equivalent to maximum determination
 577     max=0;maxi=0;maxj=0;maxk=0;
 578
 579     printf("     Proceeding to identification");
 580
 581     for(i=0;i<kDimensionTheta;i++)
 582       for(j=0;j<kDimensionPhi;j++)
 583         for(k=0;k<kDimensionOmega;k++)
 584             if(point[i][j][k]>max)
 585               {
 586                 //cout<<"maxi="<<i*90/dimension<<" maxj="<<j*90/dimension<<" maxk="<<k*kMaxOmega/dimension*180/kPi<<" max="<<max<<endl;
 587                 maxi=i;maxj=j;maxk=k;
 588                 max=point[i][j][k];
 589                 printf(".");
 590                 //printf("Max Omega %d, Max Theta %d, Max Phi %d (%d counts)\n",maxk,maxi,maxj,max);
 591               }
 592     printf("\n");
 593
 594     Float_t FinalOmega = maxk*(kMaxOmega-kMinOmega)/kDimensionOmega;
 595     Float_t FinalTheta = maxi*kMaxTheta/kDimensionTheta;
 596     Float_t FinalPhi = maxj*kMaxPhi/kDimensionPhi;
 597
 598     FinalOmega += kMinOmega;
 599
 600     //printf("Detected angle for height %3.1f and for center %3.1f %3.1f:%f\n",h,cx,cy,maxk*kPi/(kDimensionTheta*4));
 601     printf("     Indentified angles: cerenkov - %f, theta - %3.1f, phi - %3.1f (%f activation)\n", FinalOmega, FinalTheta*180/kPi, FinalPhi*180/kPi, max);
 602     //printf("Detected angle for height %3.1f and for center %3.1f %3.1f:%f\n",kHeight,cx,cy,maxk);
 603
 604     //fscanf(omegas,"%f",&realomega);
 605     //fscanf(thetas,"%f",&realtheta);
 606     //printf("Real Omega: %f",realomega);
 607     //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;
 608
 609     //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));
 610
 611     /*for(j=0;j<np;j++)
 612       pointpp(maxj*90/kDimensionTheta,maxi*90/kDimensionPhi,maxk*kMaxOmega/kDimensionOmega*180/kPi,cx,cy);//Generates a point on the elipse*/
 613
 614
 615     //Start filling rec. hits
 616
 617     rechit[0] = FinalTheta;
 618     rechit[1] = 90*kPi/180 + FinalPhi;
 619     rechit[2] = FinalOmega;
 620     rechit[3] = cx;
 621     rechit[4] = cy;
 622
 623     //CreatePoints(FinalTheta, 270*kPi/180 + FinalPhi, FinalOmega, kHeight);
 624
 625     //printf ("track %d, theta %f, phi %f, omega %f\n\n\n",track,rechit[0],rechit[1],rechit[2]);
 626
 627     // fill rechits
 628     pRICH->AddRecHit3D(nch-1,rechit);
 629     //printf("rechit %f %f %f %f %f\n",rechit[0],rechit[1],rechit[2],rechit[3],rechit[4]);
 630     //printf("Chamber:%d",nch);
 631   }
 632   //printf("\n\n\n\n");
 633   gAlice->TreeR()->Fill();
 634   TClonesArray *fRec;
 635   for (i=0;i<kNCH;i++) {
 636     fRec=pRICH->RecHitsAddress3D(i);
 637     int ndig=fRec->GetEntriesFast();
 638     printf ("Chamber %d, rings %d\n",i+1,ndig);
 639   }
 640   pRICH->ResetRecHits3D();
 641
 642   free_i3tensor(point,0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 643   free_i3tensor(point1,0,kDimensionTheta,0,kDimensionPhi,0,kDimensionOmega);
 644 }
 645
 646
 647
 648 Float_t AliRICHDetect:: Area(Float_t theta,Float_t omega)
 649 {
 650
 651 //
 652 // Calculates area of an ellipse for given incidence angles
 653
 654
 655     Float_t area;
 656     const Float_t kHeight=9.25;                       //Distance from Radiator to Pads in pads
 657
 658     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);
 659
 660     return (area);
 661 }
 662
 663
 664 Int_t ***AliRICHDetect::i3tensor(long nrl, long nrh, long ncl, long nch, long ndl, long ndh)
 665 // allocate a Int_t 3tensor with range t[nrl..nrh][ncl..nch][ndl..ndh]
 666 {
 667   long i,j,nrow=nrh-nrl+1,ncol=nch-ncl+1,ndep=ndh-ndl+1;
 668   Int_t ***t;
 669
 670   int NR_END=1;
 671
 672   // allocate pointers to pointers to rows
 673   t=(Int_t ***) malloc((size_t)((nrow+NR_END)*sizeof(Int_t**)));
 674   if (!t) printf("allocation failure 1 in f3tensor()");
 675   t += NR_END;
 676   t -= nrl;
 677
 678   // allocate pointers to rows and set pointers to them
 679   t[nrl]=(Int_t **) malloc((size_t)((nrow*ncol+NR_END)*sizeof(Int_t*)));
 680   if (!t[nrl]) printf("allocation failure 2 in f3tensor()");
 681   t[nrl] += NR_END;
 682   t[nrl] -= ncl;
 683
 684   // allocate rows and set pointers to them
 685   t[nrl][ncl]=(Int_t *) malloc((size_t)((nrow*ncol*ndep+NR_END)*sizeof(Int_t)));
 686   if (!t[nrl][ncl]) printf("allocation failure 3 in f3tensor()");
 687   t[nrl][ncl] += NR_END;
 688   t[nrl][ncl] -= ndl;
 689
 690   for(j=ncl+1;j<=nch;j++) t[nrl][j]=t[nrl][j-1]+ndep;
 691   for(i=nrl+1;i<=nrh;i++) {
 692     t[i]=t[i-1]+ncol;
 693     t[i][ncl]=t[i-1][ncl]+ncol*ndep;
 694     for(j=ncl+1;j<=nch;j++) t[i][j]=t[i][j-1]+ndep;
 695   }
 696
 697   // return pointer to array of pointers to rows
 698   return t;
 699 }
 700
 701 void AliRICHDetect::free_i3tensor(int ***t, long nrl, long nrh, long ncl, long nch,long ndl, long ndh)
 702 // free a Int_t f3tensor allocated by i3tensor()
 703 {
 704   int NR_END=1;
 705
 706   free((char*) (t[nrl][ncl]+ndl-NR_END));
 707   free((char*) (t[nrl]+ncl-NR_END));
 708   free((char*) (t+nrl-NR_END));
 709 }
 710
 711
 712 Float_t AliRICHDetect:: SnellAngle(Float_t iangle)
 713 {
 714
 715 // Compute the Snell angle
 716
 717   Float_t nfreon  = 1.295;
 718   Float_t nquartz = 1.585;
 719   Float_t ngas = 1;
 720
 721   Float_t sinrangle;
 722   Float_t rangle;
 723   Float_t a1, a2;
 724
 725   a1=nfreon/nquartz;
 726   a2=nquartz/ngas;
 727
 728   sinrangle = a1*a2*sin(iangle);
 729
 730   if(sinrangle>1.) {
 731      rangle = 999.;
 732      return rangle;
 733   }
 734
 735   rangle = asin(sinrangle);
 736   return rangle;
 737 }
 738
 739 Float_t AliRICHDetect:: InvSnellAngle(Float_t rangle)
 740 {
 741
 742 // Compute the inverse Snell angle
 743
 744   Float_t nfreon  = 1.295;
 745   Float_t nquartz = 1.585;
 746   Float_t ngas = 1;
 747
 748   Float_t siniangle;
 749   Float_t iangle;
 750   Float_t a1,a2;
 751
 752   a1=nfreon/nquartz;
 753   a2=nquartz/ngas;
 754
 755   siniangle = sin(rangle)/(a1*a2);
 756   iangle = asin(siniangle);
 757
 758   if(siniangle>1.) {
 759      iangle = 999.;
 760      return iangle;
 761   }
 762
 763   iangle = asin(siniangle);
 764   return iangle;
 765 }
 766
 767
 768
 769 //________________________________________________________________________________
 770 void AliRICHDetect::CreatePoints(Float_t theta, Float_t phi, Float_t omega, Float_t h)
 771 {
 772
 773   // Create points along the ellipse equation
 774
 775   Int_t s1,s2;
 776   Float_t fiducial=h*TMath::Tan(omega+theta), l=h/TMath::Cos(theta), xtrial, y=0, c0, c1, c2;
 777   //TRandom *random=new TRandom();
 778
 779   static TH2F *REllipse = new TH2F("REllipse","Reconstructed ellipses",150,-25,25,150,-25,25);
 780
 781   for(Float_t i=0;i<1000;i++)
 782     {
 783
 784       Float_t counter=0;
 785
 786       c0=0;c1=0;c2=0;
 787       while((c1*c1-4*c2*c0)<=0 && counter<1000)
 788         {
 789           //Choose which side to go...
 790           if(i>250 && i<750) s1=1;
 791           //if (gRandom->Rndm(1)>.5) s1=1;
 792           else s1=-1;
 793           //printf("s1:%d\n",s1);
 794           //Trial a y
 795           y=s1*i*gRandom->Rndm(Int_t(fiducial/50));
 796           //printf("Fiducial %f  for omega:%f theta:%f phi:%f\n",fiducial,omega,theta,fphi);
 797           Float_t alfa1=theta;
 798           Float_t theta1=phi;
 799           Float_t omega1=omega;
 800
 801           //Solve the eq for a trial x
 802           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);
 803           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);
 804           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);
 805           //cout<<"Trial: y="<<y<<"c0="<<c0<<" c1="<<c1<<" c2="<<c2<<endl;
 806           //printf("Result:%f\n\n",c1*c1-4*c2*c0);
 807           //i+=.01;
 808           counter +=1;
 809         }
 810
 811       if (counter>=1000)
 812         y=0;
 813
 814       //Choose which side to go...
 815       //if(gRandom->Rndm(1)>.5) s=1;
 816       //else s=-1;
 817       if(i>500) s2=1;
 818       //if (gRandom->Rndm(1)>.5) s2=1;
 819       else s2=-1;
 820       xtrial=(-c1+s2*TMath::Sqrt(c1*c1-4*c2*c0))/(2*c2);
 821       //cout<<"x="<<xtrial<<" y="<<cy+y<<endl;
 822       //printf("Coordinates: %f %f\n",xtrial,fCy+y);
 823
 824       REllipse->Fill(xtrial,y);
 825
 826       //printf("Coordinates: %f %f %f\n",vectorGlob[0],vectorGlob[1],vectorGlob[2]);
 827     }
 828
 829   fc3->cd(2);
 830   REllipse->Draw();
 831 }