1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.9 2001/05/28 17:07:58 hristov
19 Last minute changes; ExB correction in AliTRDclusterizerV1; taking into account of material in G10 TEC frames and material between TEC planes (C.Blume,S.Sedykh)
21 Revision 1.8 2001/05/07 08:06:44 cblume
22 Speedup of the code. Create only AliTRDcluster
24 Revision 1.7 2001/02/14 18:22:26 cblume
25 Change in the geometry of the padplane
27 Revision 1.6 2000/11/01 14:53:20 cblume
28 Merge with TRD-develop
30 Revision 1.1.4.6 2000/10/16 01:16:53 cblume
31 Changed timebin 0 to be the one closest to the readout
33 Revision 1.1.4.5 2000/10/15 23:40:01 cblume
36 Revision 1.1.4.4 2000/10/06 16:49:46 cblume
39 Revision 1.1.4.3 2000/10/04 16:34:58 cblume
40 Replace include files by forward declarations
42 Revision 1.1.4.2 2000/09/22 14:49:49 cblume
43 Adapted to tracking code
45 Revision 1.5 2000/10/02 21:28:19 fca
46 Removal of useless dependecies via forward declarations
48 Revision 1.4 2000/06/08 18:32:58 cblume
49 Make code compliant to coding conventions
51 Revision 1.3 2000/06/07 16:27:01 cblume
52 Try to remove compiler warnings on Sun and HP
54 Revision 1.2 2000/05/08 16:17:27 cblume
57 Revision 1.1.4.1 2000/05/08 15:08:41 cblume
58 Replace AliTRDcluster by AliTRDrecPoint
60 Revision 1.4 2000/06/08 18:32:58 cblume
61 Make code compliant to coding conventions
63 Revision 1.3 2000/06/07 16:27:01 cblume
64 Try to remove compiler warnings on Sun and HP
66 Revision 1.2 2000/05/08 16:17:27 cblume
69 Revision 1.1.4.1 2000/05/08 15:08:41 cblume
70 Replace AliTRDcluster by AliTRDrecPoint
72 Revision 1.1 2000/02/28 18:58:33 cblume
77 ///////////////////////////////////////////////////////////////////////////////
79 // TRD cluster finder for the fast simulator. It takes the hits from the //
80 // fast simulator (one hit per plane) and transforms them //
81 // into cluster, by applying position smearing and merging //
82 // of nearby cluster. The searing is done uniformly in z-direction //
83 // over the length of a readout pad. In rphi-direction a Gaussian //
84 // smearing is applied with a sigma given by fRphiSigma. //
85 // Clusters are considered as overlapping when they are closer in //
86 // rphi-direction than the value defined in fRphiDist. //
87 // Use the macro fastClusterCreate.C to create the cluster. //
89 ///////////////////////////////////////////////////////////////////////////////
97 #include "AliTRDclusterizerV0.h"
98 #include "AliTRDhit.h"
99 #include "AliTRDgeometry.h"
100 #include "AliTRDrecPoint.h"
102 ClassImp(AliTRDclusterizerV0)
104 //_____________________________________________________________________________
105 AliTRDclusterizerV0::AliTRDclusterizerV0():AliTRDclusterizer()
108 // AliTRDclusterizerV0 default constructor
113 //_____________________________________________________________________________
114 AliTRDclusterizerV0::AliTRDclusterizerV0(const Text_t* name, const Text_t* title)
115 :AliTRDclusterizer(name,title)
118 // AliTRDclusterizerV0 default constructor
125 //_____________________________________________________________________________
126 AliTRDclusterizerV0::~AliTRDclusterizerV0()
129 // AliTRDclusterizerV0 destructor
134 //_____________________________________________________________________________
135 void AliTRDclusterizerV0::Init()
138 // Initializes the cluster finder
141 // Position resolution in rphi-direction
143 // Minimum distance of non-overlapping cluster
148 //_____________________________________________________________________________
149 Bool_t AliTRDclusterizerV0::MakeClusters()
152 // Generates the cluster
155 if (fTRD->IsVersion() != 0) {
156 printf("AliTRDclusterizerV0::MakeCluster -- ");
157 printf("TRD must be version 0 (fast simulator).\n");
162 AliTRDgeometry *geo = fTRD->GetGeometry();
164 printf("AliTRDclusterizerV0::MakeCluster -- ");
165 printf("Start creating cluster.\n");
171 // Get the pointer to the hit tree
172 TTree *hitTree = gAlice->TreeH();
173 // Get the pointer to the reconstruction tree
174 TTree *clusterTree = gAlice->TreeR();
176 TObjArray *chamberArray = new TObjArray();
178 // Get the number of entries in the hit tree
179 // (Number of primary particles creating a hit somewhere)
180 Int_t nTrack = (Int_t) hitTree->GetEntries();
182 // Loop through all the chambers
183 for (Int_t icham = 0; icham < AliTRDgeometry::Ncham(); icham++) {
184 for (Int_t iplan = 0; iplan < AliTRDgeometry::Nplan(); iplan++) {
185 for (Int_t isect = 0; isect < AliTRDgeometry::Nsect(); isect++) {
187 Int_t nColMax = geo->GetColMax(iplan);
188 Float_t row0 = geo->GetRow0(iplan,icham,isect);
189 Float_t col0 = geo->GetCol0(iplan);
190 Float_t time0 = geo->GetTime0(iplan);
192 Float_t rowPadSize = geo->GetRowPadSize(iplan,icham,isect);
193 Float_t colPadSize = geo->GetColPadSize(iplan);
194 Float_t timeBinSize = geo->GetTimeBinSize();
196 // Loop through all entries in the tree
197 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
200 nBytes += hitTree->GetEvent(iTrack);
202 // Get the number of hits in the TRD created by this particle
203 Int_t nHit = fTRD->Hits()->GetEntriesFast();
205 // Loop through the TRD hits
206 for (Int_t iHit = 0; iHit < nHit; iHit++) {
208 if (!(hit = (AliTRDhit *) fTRD->Hits()->UncheckedAt(iHit)))
215 Int_t track = hit->Track();
216 Int_t detector = hit->GetDetector();
217 Int_t plane = geo->GetPlane(detector);
218 Int_t sector = geo->GetSector(detector);
219 Int_t chamber = geo->GetChamber(detector);
221 if ((sector != isect) ||
226 // Rotate the sectors on top of each other
228 geo->Rotate(detector,pos,rot);
230 // Add this recPoint to the temporary array for this chamber
231 AliTRDrecPoint *recPoint = new AliTRDrecPoint("");
232 recPoint->SetLocalRow(rot[2]);
233 recPoint->SetLocalCol(rot[1]);
234 recPoint->SetLocalTime(rot[0]);
235 recPoint->SetEnergy(0);
236 recPoint->SetDetector(detector);
237 recPoint->AddDigit(track);
238 chamberArray->Add(recPoint);
244 // Loop through the temporary cluster-array
245 for (Int_t iClus1 = 0; iClus1 < chamberArray->GetEntries(); iClus1++) {
247 AliTRDrecPoint *recPoint1 = (AliTRDrecPoint *)
248 chamberArray->UncheckedAt(iClus1);
249 Float_t row1 = recPoint1->GetLocalRow();
250 Float_t col1 = recPoint1->GetLocalCol();
251 Float_t time1 = recPoint1->GetLocalTime();
253 if (recPoint1->GetEnergy() < 0) continue; // Skip marked cluster
255 const Int_t kNsave = 5;
256 Int_t idxSave[kNsave];
259 const Int_t kNsaveTrack = 3;
260 Int_t tracks[kNsaveTrack];
261 tracks[0] = recPoint1->GetDigit(0);
263 // Check the other cluster to see, whether there are close ones
264 for (Int_t iClus2 = iClus1 + 1; iClus2 < chamberArray->GetEntries(); iClus2++) {
266 AliTRDrecPoint *recPoint2 = (AliTRDrecPoint *)
267 chamberArray->UncheckedAt(iClus2);
268 Float_t row2 = recPoint2->GetLocalRow();
269 Float_t col2 = recPoint2->GetLocalCol();
271 if ((TMath::Abs(row1 - row2) < rowPadSize) ||
272 (TMath::Abs(col1 - col2) < fRphiDist)) {
273 if (iSave == kNsave) {
274 printf("AliTRDclusterizerV0::MakeCluster -- ");
275 printf("Boundary error: iSave = %d, kNsave = %d.\n"
279 idxSave[iSave] = iClus2;
281 if (iSave < kNsaveTrack) tracks[iSave] = recPoint2->GetDigit(0);
286 // Merge close cluster
287 Float_t rowMerge = row1;
288 Float_t colMerge = col1;
290 for (Int_t iMerge = 0; iMerge < iSave; iMerge++) {
291 AliTRDrecPoint *recPoint2 =
292 (AliTRDrecPoint *) chamberArray->UncheckedAt(idxSave[iMerge]);
293 rowMerge += recPoint2->GetLocalRow();
294 colMerge += recPoint2->GetLocalCol();
295 recPoint2->SetEnergy(-1); // Mark merged cluster
297 rowMerge /= (iSave + 1);
298 colMerge /= (iSave + 1);
303 // The position smearing in row-direction (uniform over pad width)
304 Int_t row = (Int_t) ((rowMerge - row0) / rowPadSize);
305 smear[0] = (row + gRandom->Rndm()) * rowPadSize + row0;
307 // The position smearing in rphi-direction (Gaussian)
310 smear[1] = gRandom->Gaus(colMerge,fRphiSigma);
311 while ((smear[1] < col0 ) ||
312 (smear[1] > col0 + nColMax * colPadSize));
314 // Time direction stays unchanged
317 // Transform into local coordinates
318 smear[0] = (Int_t) ((smear[0] - row0) / rowPadSize);
319 smear[1] = (Int_t) ((smear[1] - col0) / colPadSize);
320 smear[2] = (Int_t) ((time0 - smear[2]) / timeBinSize);
322 // Add the smeared cluster to the output array
323 Int_t detector = recPoint1->GetDetector();
324 Int_t digits[3] = {0};
326 fTRD->AddCluster(smear,digits,detector,0.0,tr,0,0);
330 // Clear the temporary cluster-array and delete the cluster
331 chamberArray->Delete();
337 printf("AliTRDclusterizerV0::MakeCluster -- ");
338 printf("Found %d points.\n",fTRD->RecPoints()->GetEntries());
339 printf("AliTRDclusterizerV0::MakeCluster -- ");
340 printf("Fill the cluster tree.\n");