--- /dev/null
+Int_t AliITSHits2SDigits(const char *inFile = "galice.root"){
+ // Connect the Root Galice file containing Geometry, Kine and Hits
+
+ TFile *file = (TFile*)gROOT->GetListOfFiles()->FindObject(inFile);
+ if (file) {file->Close(); delete file;}
+ cout << "AliITSHits2Digits" << endl;
+ file = new TFile(inFile,"UPDATE");
+ if (!file->IsOpen()) {
+ cerr<<"Can't open "<<inFile<<" !" << endl;
+ return 1;
+ } // end if !file
+ file->ls();
+
+ // Get AliRun object from file or return if not on file
+ if (gAlice) delete gAlice;
+ gAlice = (AliRun*)file->Get("gAlice");
+ if (!gAlice) {
+ cerr << "AliITSITSHits2Digits.C : AliRun object not found on file"
+ << endl;
+ return 2;
+ } // end if !gAlice
+
+ gAlice->GetEvent(0);
+ AliITS *ITS = (AliITS*)gAlice->GetDetector("ITS");
+ if (!ITS) {
+ cerr<<"AliITSHits2Digits.C : AliITS object not found on file"
+ << endl;
+ return 3;
+ } // end if !ITS
+
+ // Set the simulation models for the three detector types
+ AliITSgeom *geom = ITS->GetITSgeom();
+
+ // SPD
+ cout << "Changing from Default SPD simulation, and responce." << endl;
+ AliITSDetType *iDetType=ITS->DetType(0);
+ AliITSsegmentationSPD *seg0=(AliITSsegmentationSPD*)iDetType->
+ GetSegmentationModel();
+ AliITSresponseSPD *res0 = (AliITSresponseSPD*)iDetType->GetResponseModel();
+ AliITSsimulationSPD *sim0=new AliITSsimulationSPD(seg0,res0);
+ ITS->SetSimulationModel(0,sim0);
+ // test
+ cout << "SPD dimensions " << seg0->Dx() << " " << seg0->Dz() << endl;
+ cout << "SPD npixels " << seg0->Npz() << " " << seg0->Npx() << endl;
+ cout << "SPD pitches " << seg0->Dpz(0) << " " << seg0->Dpx(0) << endl;
+ // end test
+
+ // SDD
+ cout << "Changing from Default SDD simulation, and responce." << endl;
+ //Set response functions
+ Float_t baseline = 10.;
+ Float_t noise = 1.75;
+ // SDD compression param: 2 fDecrease, 2fTmin, 2fTmax or disable,
+ // 2 fTolerance
+ AliITSDetType *iDetType=ITS->DetType(1);
+ AliITSresponseSDD *res1 = (AliITSresponseSDD*)iDetType->GetResponseModel();
+ if (!res1) {
+ res1=new AliITSresponseSDD();
+ ITS->SetResponseModel(1,res1);
+ } // end if !res1
+ Float_t fCutAmp = baseline + 2.*noise;
+ Int_t cp[8]={0,0,fCutAmp,fCutAmp,0,0,0,0}; //1D
+
+ //res1->SetZeroSupp("2D");
+ res1->SetZeroSupp("1D");
+ res1->SetNoiseParam(noise,baseline);
+ res1->SetDo10to8(kTRUE);
+ res1->SetCompressParam(cp);
+ res1->SetMinVal(4);
+ res1->SetDiffCoeff(3.6,40.);
+ AliITSsegmentationSDD *seg1=(AliITSsegmentationSDD*)iDetType->
+ GetSegmentationModel();
+ if (!seg1) {
+ seg1 = new AliITSsegmentationSDD(geom,res1);
+ ITS->SetSegmentationModel(1,seg1);
+ } // end if !seg1
+ AliITSsimulationSDD *sim1 = new AliITSsimulationSDD(seg1,res1);
+ sim1->SetDoFFT(1);
+ sim1->SetCheckNoise(kFALSE);
+ ITS->SetSimulationModel(1,sim1);
+
+ // SSD
+ cout << "Changing from Default SSD simulation, and responce." << endl;
+ AliITSDetType *iDetType = ITS->DetType(2);
+ AliITSsegmentationSSD *seg2 = (AliITSsegmentationSSD*)iDetType->
+ GetSegmentationModel();
+ AliITSresponseSSD *res2 = (AliITSresponseSSD*)iDetType->GetResponseModel();
+ res2->SetSigmaSpread(3.,2.);
+ AliITSsimulationSSD *sim2 = new AliITSsimulationSSD(seg2,res2);
+ ITS->SetSimulationModel(2,sim2);
+
+ if(!gAlice->TreeS()){
+ cout << "Having to create the SDigits Tree." << endl;
+ gAlice->MakeTree("S");
+ } // end if !gAlice->TreeS()
+ //make branch
+ ITS->MakeBranch("S");
+ ITS->SetTreeAddress();
+ cout << "Digitizing ITS..." << endl;
+
+ TStopwatch timer;
+ Long_t size0 = file->GetSize();
+ timer.Start();
+ ITS->Hits2SDigits();
+ timer.Stop(); timer.Print();
+
+ delete gAlice; gAlice=0;
+ file->Close();
+ Long_t size1 = file->GetSize();
+ cout << "File size before = " << size0 << " file size after = " << size1;
+ cout << "Increase in file size is " << size1-size0 << " Bytes" << endl;
+ delete file;
+ return 0;
+};
+