[u/mrichter/AliRoot.git] / ITS / AliITSDigitizer.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
 
/* $Id$ */
///////////////////////////////////////////////////////////////////////////
//Piotr.Skowronski@cern.ch :                                             //
//Corrections applied in order to compile (only)                         // 
//   with new I/O and folder structure                                   //
//To be implemented correctly by responsible                             //
//                                                                       //
//  Class used to steer                                                  //
//  the digitization for ITS                                             //
//                                                                       //
///////////////////////////////////////////////////////////////////////////

#include <stdlib.h>
#include <TClonesArray.h>
#include <TTree.h>
#include <TBranch.h>

#include "AliRun.h"
#include "AliRunLoader.h"
#include "AliLoader.h"
#include "AliLog.h"
#include "AliRunDigitizer.h"
#include "AliITSDigitizer.h"
#include "AliITSgeom.h"
#include "AliITSsimulation.h"

ClassImp(AliITSDigitizer)

//______________________________________________________________________
AliITSDigitizer::AliITSDigitizer() : AliDigitizer(),
fITS(0),
fModActive(0),
fInit(kFALSE),
fRoif(-1),
fRoiifile(0),
fFlagFirstEv(kTRUE){
    // Default constructor. Assign fITS since it is never written out from
    // here. 
    // Inputs:
    //      Option_t * opt   Not used
    // Outputs:
    //      none.
    // Return:
    //      A blank AliITSDigitizer class.

}
//______________________________________________________________________
AliITSDigitizer::AliITSDigitizer(AliRunDigitizer *mngr) : AliDigitizer(mngr),
fITS(0),
fModActive(0),
fInit(kFALSE),
fRoif(-1),
fRoiifile(0),
fFlagFirstEv(kTRUE){
    // Standard constructor. Assign fITS since it is never written out from
    // here. 
    // Inputs:
    //      Option_t * opt   Not used
    // Outputs:
    //      none.
    // Return:
    //      An AliItSDigitizer class.

}


//______________________________________________________________________
AliITSDigitizer::~AliITSDigitizer(){
    // Default destructor. 
    // Inputs:
    //      Option_t * opt   Not used
    // Outputs:
    //      none.
    // Return:
    //      none.
    fITS = 0; // don't delete fITS. Done else where.
    if(fModActive) delete[] fModActive;
}
//______________________________________________________________________
Bool_t AliITSDigitizer::Init(){
    // Initialization. Set up region of interest, if switched on, and
    // loads ITS and ITSgeom.
    // Inputs:
    //      none.
    // Outputs:
    //      none.
    // Return:
    //      none.

    fInit = kTRUE; // Assume for now init will work.
    if(!gAlice) {
	fITS      = 0;
	fRoiifile = 0;
	fInit     = kFALSE;
	Warning("Init","gAlice not found");
	return fInit;
    } // end if
    fITS = (AliITS *)(gAlice->GetDetector("ITS"));
    if(!fITS){
	fRoiifile = 0;
	fInit     = kFALSE;
	Warning("Init","ITS not found");
	return fInit;
    } else if(fITS->GetITSgeom()){
	//cout << "fRoif,fRoiifile="<<fRoif<<" "<<fRoiifile<<endl;
	fModActive = new Bool_t[fITS->GetITSgeom()->GetIndexMax()];
    } else{
	fRoiifile = 0;
	fInit     = kFALSE;
	Warning("Init","ITS geometry not found");
	return fInit;
    } // end if
    // fModActive needs to be set to a default all kTRUE value
    for(Int_t i=0;i<fITS->GetITSgeom()->GetIndexMax();i++) fModActive[i] = kTRUE;
    return fInit;
}
//______________________________________________________________________
void AliITSDigitizer::Exec(Option_t* opt){
    // Main digitization function. 
    // Inputs:
    //      Option_t * opt   list of sub detector to digitize. =0 all.
    // Outputs:
    //      none.
    // Return:
    //      none.

    char name[20] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    const char *all;
    const char *det[3] = {strstr(opt,"SPD"),strstr(opt,"SDD"),
                          strstr(opt,"SSD")};
    if( !det[0] && !det[1] && !det[2] ) all = "All";
    else all = 0;
    Int_t nfiles = GetManager()->GetNinputs();
    Int_t event  = GetManager()->GetOutputEventNr();
    AliITSsimulation *sim      = 0;
    if(fFlagFirstEv){
      fITS->SetDefaults();    
      fITS->SetDefaultSimulation();
      fFlagFirstEv=kFALSE;
    }
    if(!fInit){
	Error("Exec","Init not successful, aborting.");
	return;
    } // end if

    sprintf(name,"%s",fITS->GetName());

    Int_t size   = fITS->GetITSgeom()->GetIndexMax();
    Int_t module,id,ifiles,mask;
    Bool_t lmod;
    Int_t *fl = new Int_t[nfiles];
    fl[0] = fRoiifile;
    mask = 1;
    for(id=0;id<nfiles;id++) 
     if(id!=fRoiifile)
      {
       // just in case fRoiifile!=0.
        fl[mask] = id;
        mask++;
      } // end for,if
    TClonesArray * sdig = new TClonesArray( "AliITSpListItem",1000 );
    
    TString loadname(name);
    loadname+="Loader";
    
    AliRunLoader *inRL = 0x0, *outRL = 0x0;
    AliLoader *ingime = 0x0, *outgime = 0x0;    
    
    outRL = AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());    
    if ( outRL == 0x0)
     {
       Error("Exec","Can not get Output Run Loader");
       return;
     }
    outRL->GetEvent(event);
    outgime = outRL->GetLoader(loadname);
    if ( outgime == 0x0)
     {
       Error("Exec","Can not get Output ITS Loader");
       return;
     }

    outgime->LoadDigits("update");
    if (outgime->TreeD() == 0x0) outgime->MakeTree("D");
    
    // Digitize
    fITS->MakeBranchInTreeD(outgime->TreeD());
    if(fRoif!=0) {
      AliDebug(1,"Region of Interest digitization selected");
    }
    else {
      AliDebug(1,"No Region of Interest selected. Digitizing everything");
    }
    if(fModActive==0) fRoif = 0; // fModActive array must be define for RIO cuts.

    for(ifiles=0; ifiles<nfiles; ifiles++ )
     {
       inRL =  AliRunLoader::GetRunLoader(fManager->GetInputFolderName(fl[ifiles]));
       ingime = inRL->GetLoader(loadname);
       if (ingime->TreeS() == 0x0) ingime->LoadSDigits();
     }

    for(module=0; module<size; module++ )
     {
       if(fModActive && fRoif!=0) if(!fModActive[module]) continue;
       id = fITS->GetITSgeom()->GetModuleType(module);
       if(!all && !det[id]) continue;
       sim      = (AliITSsimulation*)fITS->GetSimulationModel(id);
       if(!sim) {
            Error( "Exec", "The simulation class was not instanciated!" );
            exit(1);
        } // end if !sim
           // Fill the module with the sum of SDigits
        sim->InitSimulationModule(module, event);
	//cout << "Module=" << module;
        for(ifiles=0; ifiles<nfiles; ifiles++ )
         {
           if(fRoif!=0) if(!fModActive[module]) continue;
            
           inRL =  AliRunLoader::GetRunLoader(fManager->GetInputFolderName(fl[ifiles]));
           ingime = inRL->GetLoader(loadname);
           
           TTree *treeS = ingime->TreeS();
           fITS->SetTreeAddress();
           
           if( !treeS  ) continue; 
           TBranch *brchSDigits = treeS->GetBranch( name );
           if( brchSDigits ) 
            {
                brchSDigits->SetAddress( &sdig ); 
            } else {
                Error( "Exec", "branch ITS not found in TreeS, input file %d ",
                       ifiles );
		return;
            } // end if brchSDigits
            sdig->Clear();
            mask = GetManager()->GetMask(ifiles);
            // add summable digits to module
            brchSDigits->GetEvent( module );
            lmod = sim->AddSDigitsToModule(sdig,mask);
            if(fRegionOfInterest && (ifiles==0))
             {
               fModActive[module] = lmod;
             } // end if
        } // end for ifiles
	//cout << " end ifiles loop" << endl;
        // Digitize current module sum(SDigits)->Digits
	sim->FinishSDigitiseModule();

        // fills all branches - wasted disk space
        outgime->TreeD()->Fill();
	fITS->ResetDigits();
    } // end for module
    
    outgime->TreeD()->AutoSave();
    outgime->WriteDigits("OVERWRITE");
    outgime->UnloadDigits();
    for(ifiles=0; ifiles<nfiles; ifiles++ )
     {
       inRL =  AliRunLoader::GetRunLoader(fManager->GetInputFolderName(fl[ifiles]));
       ingime = inRL->GetLoader(loadname);
       ingime->UnloadSDigits();
     }

    delete[] fl;
    sdig->Clear();
    delete sdig;
    for(Int_t i=0;i<fITS->GetITSgeom()->GetIndexMax();i++) fModActive[i] = kTRUE;
    

    return;
}
//______________________________________________________________________
void AliITSDigitizer::SetByRegionOfInterest(TTree *ts){
    // Scans through the ITS branch of the SDigits tree, ts, for modules
    // which have SDigits in them. For these modules, a flag is set to
    // digitize only these modules. The value of fRoif determines how many
    // neighboring modules will also be turned on. fRoif=0 will turn on only
    // those modules with SDigits in them. fRoif=1 will turn on, in addition,
    // those modules that are +-1 module from the one with the SDigits. And
    // So on. This last feature is not supported yet.
    // Inputs:
    //      TTree *ts  The tree in which the existing SDigits will define the
    //                 region of interest.
    // Outputs:
    //      none.
    // Return:
    //      none.
    Int_t m,nm,i;

    if(fRoif==0) return;
    if(ts==0) return;
    TBranch *brchSDigits = ts->GetBranch(fITS->GetName());
    TClonesArray * sdig = new TClonesArray( "AliITSpListItem",1000 );
    //cout << "Region of Interest ts="<<ts<<" brchSDigits="<<brchSDigits<<" sdig="<<sdig<<endl;

    if( brchSDigits ) {
      brchSDigits->SetAddress( &sdig );
    } else {
      Error( "SetByRegionOfInterest","branch ITS not found in TreeS");
      return;
    } // end if brchSDigits

    nm = fITS->GetITSgeom()->GetIndexMax();
    for(m=0;m<nm;m++){
      //cout << " fModActive["<<m<<"]=";
      fModActive[m] = kFALSE; // Not active by default
      sdig->Clear();
      brchSDigits->GetEvent(m);
      if(sdig->GetLast()>=0) for(i=0;i<sdig->GetLast();i++){
          // activate the necessary modules
          if(((AliITSpList*)sdig->At(m))->GetpListItem(i)->GetSignal()>0.0){ // Must have non zero signal.
            fModActive[m] = kTRUE;
            break;
          } // end if
      } // end if. end for i.
      //cout << fModActive[m];
      //cout << endl;
    } // end for m
    AliDebug(1,"Digitization by Region of Interest selected");
    sdig->Clear();
    delete sdig;
    return;
}
Commit	Line	Data
9ad8b5dd	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
88cb7938	16	/* $Id$ */
7d62fb64	17	///////////////////////////////////////////////////////////////////////////
	18	//Piotr.Skowronski@cern.ch : //
	19	//Corrections applied in order to compile (only) //
	20	// with new I/O and folder structure //
	21	//To be implemented correctly by responsible //
	22	// //
	23	// Class used to steer //
	24	// the digitization for ITS //
	25	// //
	26	///////////////////////////////////////////////////////////////////////////
88cb7938	27
28af028c	28	#include <stdlib.h>
88cb7938	29	#include <TClonesArray.h>
9ad8b5dd	30	#include <TTree.h>
	31	#include <TBranch.h>
	32
64f311fe	33	#include "AliRun.h"
	34	#include "AliRunLoader.h"
	35	#include "AliLoader.h"
	36	#include "AliLog.h"
	37	#include "AliRunDigitizer.h"
9ad8b5dd	38	#include "AliITSDigitizer.h"
88cb7938	39	#include "AliITSgeom.h"
9ad8b5dd	40	#include "AliITSsimulation.h"
0b572028	41
9ad8b5dd	42	ClassImp(AliITSDigitizer)
	43
	44	//______________________________________________________________________
7537d03c	45	AliITSDigitizer::AliITSDigitizer() : AliDigitizer(),
	46	fITS(0),
	47	fModActive(0),
	48	fInit(kFALSE),
	49	fRoif(-1),
	50	fRoiifile(0),
	51	fFlagFirstEv(kTRUE){
9ad8b5dd	52	// Default constructor. Assign fITS since it is never written out from
	53	// here.
	54	// Inputs:
	55	// Option_t * opt Not used
	56	// Outputs:
	57	// none.
	58	// Return:
	59	// A blank AliITSDigitizer class.
	60
9ad8b5dd	61	}
9ad8b5dd	62	//______________________________________________________________________
7537d03c	63	AliITSDigitizer::AliITSDigitizer(AliRunDigitizer *mngr) : AliDigitizer(mngr),
	64	fITS(0),
	65	fModActive(0),
	66	fInit(kFALSE),
	67	fRoif(-1),
	68	fRoiifile(0),
	69	fFlagFirstEv(kTRUE){
9ad8b5dd	70	// Standard constructor. Assign fITS since it is never written out from
	71	// here.
	72	// Inputs:
	73	// Option_t * opt Not used
	74	// Outputs:
	75	// none.
	76	// Return:
	77	// An AliItSDigitizer class.
	78
9ad8b5dd	79	}
7d62fb64	80
7d62fb64	81
9ad8b5dd	82	//______________________________________________________________________
	83	AliITSDigitizer::~AliITSDigitizer(){
	84	// Default destructor.
	85	// Inputs:
	86	// Option_t * opt Not used
	87	// Outputs:
	88	// none.
	89	// Return:
	90	// none.
9ad8b5dd	91	fITS = 0; // don't delete fITS. Done else where.
0b572028	92	if(fModActive) delete[] fModActive;
9ad8b5dd	93	}
9ad8b5dd	94	//______________________________________________________________________
9ad8b5dd	95	Bool_t AliITSDigitizer::Init(){
fd04285a	96	// Initialization. Set up region of interest, if switched on, and
fd04285a	97	// loads ITS and ITSgeom.
9ad8b5dd	98	// Inputs:
	99	// none.
	100	// Outputs:
	101	// none.
	102	// Return:
	103	// none.
fca85276	104
fd04285a	105	fInit = kTRUE; // Assume for now init will work.
fca85276	106	if(!gAlice) {
fca85276	107	fITS = 0;
fca85276	108	fRoiifile = 0;
fd04285a	109	fInit = kFALSE;
	110	Warning("Init","gAlice not found");
	111	return fInit;
fca85276	112	} // end if
	113	fITS = (AliITS *)(gAlice->GetDetector("ITS"));
	114	if(!fITS){
fca85276	115	fRoiifile = 0;
fd04285a	116	fInit = kFALSE;
	117	Warning("Init","ITS not found");
	118	return fInit;
fca85276	119	} else if(fITS->GetITSgeom()){
fd04285a	120	//cout << "fRoif,fRoiifile="<<fRoif<<" "<<fRoiifile<<endl;
0b572028	121	fModActive = new Bool_t[fITS->GetITSgeom()->GetIndexMax()];
fca85276	122	} else{
fca85276	123	fRoiifile = 0;
fd04285a	124	fInit = kFALSE;
	125	Warning("Init","ITS geometry not found");
	126	return fInit;
fca85276	127	} // end if
0b572028	128	// fModActive needs to be set to a default all kTRUE value
0b572028	129	for(Int_t i=0;i<fITS->GetITSgeom()->GetIndexMax();i++) fModActive[i] = kTRUE;
fd04285a	130	return fInit;
9ad8b5dd	131	}
	132	//______________________________________________________________________
	133	void AliITSDigitizer::Exec(Option_t* opt){
fca85276	134	// Main digitization function.
9ad8b5dd	135	// Inputs:
fca85276	136	// Option_t * opt list of sub detector to digitize. =0 all.
9ad8b5dd	137	// Outputs:
	138	// none.
	139	// Return:
	140	// none.
f1888ca5	141
9ad8b5dd	142	char name[20] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
8e8eae84	143	const char *all;
9ad8b5dd	144	const char *det[3] = {strstr(opt,"SPD"),strstr(opt,"SDD"),
9ad8b5dd	145	strstr(opt,"SSD")};
f1888ca5	146	if( !det[0] && !det[1] && !det[2] ) all = "All";
9ad8b5dd	147	else all = 0;
2a476797	148	Int_t nfiles = GetManager()->GetNinputs();
2a476797	149	Int_t event = GetManager()->GetOutputEventNr();
9ad8b5dd	150	AliITSsimulation *sim = 0;
2a476797	151	if(fFlagFirstEv){
	152	fITS->SetDefaults();
	153	fITS->SetDefaultSimulation();
	154	fFlagFirstEv=kFALSE;
	155	}
fd04285a	156	if(!fInit){
2a476797	157	Error("Exec","Init not successful, aborting.");
f1888ca5	158	return;
9ad8b5dd	159	} // end if
9ad8b5dd	160
fd04285a	161	sprintf(name,"%s",fITS->GetName());
9ad8b5dd	162
2a476797	163	Int_t size = fITS->GetITSgeom()->GetIndexMax();
fd04285a	164	Int_t module,id,ifiles,mask;
	165	Bool_t lmod;
	166	Int_t *fl = new Int_t[nfiles];
	167	fl[0] = fRoiifile;
	168	mask = 1;
88cb7938	169	for(id=0;id<nfiles;id++)
	170	if(id!=fRoiifile)
	171	{
	172	// just in case fRoiifile!=0.
	173	fl[mask] = id;
	174	mask++;
	175	} // end for,if
f1888ca5	176	TClonesArray * sdig = new TClonesArray( "AliITSpListItem",1000 );
f1888ca5	177
88cb7938	178	TString loadname(name);
	179	loadname+="Loader";
	180
	181	AliRunLoader inRL = 0x0, outRL = 0x0;
	182	AliLoader ingime = 0x0, outgime = 0x0;
	183
	184	outRL = AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
	185	if ( outRL == 0x0)
	186	{
	187	Error("Exec","Can not get Output Run Loader");
	188	return;
	189	}
	190	outRL->GetEvent(event);
	191	outgime = outRL->GetLoader(loadname);
	192	if ( outgime == 0x0)
	193	{
	194	Error("Exec","Can not get Output ITS Loader");
	195	return;
	196	}
7d62fb64	197
88cb7938	198	outgime->LoadDigits("update");
	199	if (outgime->TreeD() == 0x0) outgime->MakeTree("D");
	200
fd04285a	201	// Digitize
88cb7938	202	fITS->MakeBranchInTreeD(outgime->TreeD());
64f311fe	203	if(fRoif!=0) {
	204	AliDebug(1,"Region of Interest digitization selected");
	205	}
	206	else {
	207	AliDebug(1,"No Region of Interest selected. Digitizing everything");
	208	}
0b572028	209	if(fModActive==0) fRoif = 0; // fModActive array must be define for RIO cuts.
f1888ca5	210
88cb7938	211	for(ifiles=0; ifiles<nfiles; ifiles++ )
	212	{
	213	inRL = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(fl[ifiles]));
	214	ingime = inRL->GetLoader(loadname);
	215	if (ingime->TreeS() == 0x0) ingime->LoadSDigits();
	216	}
	217
	218	for(module=0; module<size; module++ )
	219	{
7d62fb64	220	if(fModActive && fRoif!=0) if(!fModActive[module]) continue;
	221	id = fITS->GetITSgeom()->GetModuleType(module);
	222	if(!all && !det[id]) continue;
	223	sim = (AliITSsimulation*)fITS->GetSimulationModel(id);
	224	if(!sim) {
f1888ca5	225	Error( "Exec", "The simulation class was not instanciated!" );
9ad8b5dd	226	exit(1);
9ad8b5dd	227	} // end if !sim
7d62fb64	228	// Fill the module with the sum of SDigits
fd04285a	229	sim->InitSimulationModule(module, event);
fd04285a	230	//cout << "Module=" << module;
88cb7938	231	for(ifiles=0; ifiles<nfiles; ifiles++ )
	232	{
	233	if(fRoif!=0) if(!fModActive[module]) continue;
	234
	235	inRL = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(fl[ifiles]));
	236	ingime = inRL->GetLoader(loadname);
	237
	238	TTree *treeS = ingime->TreeS();
	239	fITS->SetTreeAddress();
	240
e6b4e6b9	241	if( !treeS ) continue;
88cb7938	242	TBranch *brchSDigits = treeS->GetBranch( name );
	243	if( brchSDigits )
	244	{
f1888ca5	245	brchSDigits->SetAddress( &sdig );
	246	} else {
	247	Error( "Exec", "branch ITS not found in TreeS, input file %d ",
	248	ifiles );
fd04285a	249	return;
f1888ca5	250	} // end if brchSDigits
f1888ca5	251	sdig->Clear();
fd04285a	252	mask = GetManager()->GetMask(ifiles);
f1888ca5	253	// add summable digits to module
f1888ca5	254	brchSDigits->GetEvent( module );
fd04285a	255	lmod = sim->AddSDigitsToModule(sdig,mask);
e95475eb	256	if(fRegionOfInterest && (ifiles==0))
88cb7938	257	{
	258	fModActive[module] = lmod;
	259	} // end if
f1888ca5	260	} // end for ifiles
fd04285a	261	//cout << " end ifiles loop" << endl;
fca85276	262	// Digitize current module sum(SDigits)->Digits
7d62fb64	263	sim->FinishSDigitiseModule();
f1888ca5	264
9ad8b5dd	265	// fills all branches - wasted disk space
88cb7938	266	outgime->TreeD()->Fill();
7d62fb64	267	fITS->ResetDigits();
9ad8b5dd	268	} // end for module
7d62fb64	269
88cb7938	270	outgime->TreeD()->AutoSave();
	271	outgime->WriteDigits("OVERWRITE");
	272	outgime->UnloadDigits();
88cb7938	273	for(ifiles=0; ifiles<nfiles; ifiles++ )
	274	{
	275	inRL = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(fl[ifiles]));
	276	ingime = inRL->GetLoader(loadname);
	277	ingime->UnloadSDigits();
	278	}
fd04285a	279
fd04285a	280	delete[] fl;
f1888ca5	281	sdig->Clear();
f1888ca5	282	delete sdig;
0b572028	283	for(Int_t i=0;i<fITS->GetITSgeom()->GetIndexMax();i++) fModActive[i] = kTRUE;
7d62fb64	284
7d62fb64	285
fd04285a	286	return;
9ad8b5dd	287	}
fca85276	288	//______________________________________________________________________
	289	void AliITSDigitizer::SetByRegionOfInterest(TTree *ts){
	290	// Scans through the ITS branch of the SDigits tree, ts, for modules
	291	// which have SDigits in them. For these modules, a flag is set to
	292	// digitize only these modules. The value of fRoif determines how many
	293	// neighboring modules will also be turned on. fRoif=0 will turn on only
	294	// those modules with SDigits in them. fRoif=1 will turn on, in addition,
	295	// those modules that are +-1 module from the one with the SDigits. And
	296	// So on. This last feature is not supported yet.
	297	// Inputs:
	298	// TTree *ts The tree in which the existing SDigits will define the
	299	// region of interest.
	300	// Outputs:
	301	// none.
	302	// Return:
	303	// none.
fd04285a	304	Int_t m,nm,i;
	305
	306	if(fRoif==0) return;
	307	if(ts==0) return;
fca85276	308	TBranch *brchSDigits = ts->GetBranch(fITS->GetName());
fca85276	309	TClonesArray * sdig = new TClonesArray( "AliITSpListItem",1000 );
fd04285a	310	//cout << "Region of Interest ts="<<ts<<" brchSDigits="<<brchSDigits<<" sdig="<<sdig<<endl;
fca85276	311
fca85276	312	if( brchSDigits ) {
88cb7938	313	brchSDigits->SetAddress( &sdig );
fca85276	314	} else {
88cb7938	315	Error( "SetByRegionOfInterest","branch ITS not found in TreeS");
88cb7938	316	return;
fca85276	317	} // end if brchSDigits
	318
	319	nm = fITS->GetITSgeom()->GetIndexMax();
	320	for(m=0;m<nm;m++){
88cb7938	321	//cout << " fModActive["<<m<<"]=";
	322	fModActive[m] = kFALSE; // Not active by default
	323	sdig->Clear();
	324	brchSDigits->GetEvent(m);
	325	if(sdig->GetLast()>=0) for(i=0;i<sdig->GetLast();i++){
	326	// activate the necessary modules
	327	if(((AliITSpList*)sdig->At(m))->GetpListItem(i)->GetSignal()>0.0){ // Must have non zero signal.
	328	fModActive[m] = kTRUE;
	329	break;
	330	} // end if
	331	} // end if. end for i.
	332	//cout << fModActive[m];
	333	//cout << endl;
fca85276	334	} // end for m
64f311fe	335	AliDebug(1,"Digitization by Region of Interest selected");
fca85276	336	sdig->Clear();
fca85276	337	delete sdig;
fd04285a	338	return;
fca85276	339	}