Added functions for reading & writing transformations and sensitive volume maps files...
[u/mrichter/AliRoot.git] / MUON / AliMUONv1.cxx
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a9e2aefa 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
d7c4fbc4 3 * SigmaEffect_thetadegrees *
a9e2aefa 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 *
2c799aa2 12 * about the suitability of this software for any purpeateose. It is *
a9e2aefa 13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
88cb7938 16/* $Id$ */
a9e2aefa 17
18/////////////////////////////////////////////////////////
acc838fd 19// Manager and hits classes for set:MUON version 1 //
a9e2aefa 20/////////////////////////////////////////////////////////
acc838fd 21
abaf7c9d 22#include <TRandom.h>
23#include <TF1.h>
116cbefd 24#include <TClonesArray.h>
acc838fd 25#include <TRandom.h>
88cb7938 26#include <TVirtualMC.h>
a9e2aefa 27
30178c30 28#include "AliMUONv1.h"
a9e2aefa 29#include "AliConst.h"
30#include "AliMUONChamber.h"
88cb7938 31#include "AliMUONConstants.h"
32#include "AliMUONFactory.h"
a9e2aefa 33#include "AliMUONHit.h"
8c449e83 34#include "AliMUONTriggerCircuit.h"
d4bb94a1 35#include "AliMUONGeometryBuilder.h"
88cb7938 36#include "AliMagF.h"
37#include "AliRun.h"
5d12ce38 38#include "AliMC.h"
a9e2aefa 39
40ClassImp(AliMUONv1)
41
42//___________________________________________
30178c30 43AliMUONv1::AliMUONv1()
44 : AliMUON(),
d4bb94a1 45 fStepManagerVersionOld(kFALSE),
46 fAngleEffect(kTRUE),
47 fStepMaxInActiveGas(0.6),
48 fStepSum(0x0),
49 fDestepSum(0x0),
50 fTrackMomentum(),
51 fTrackPosition(),
52 fElossRatio(0x0),
53 fAngleEffect10(0x0),
54 fAngleEffectNorma(0x0)
a9e2aefa 55{
d4bb94a1 56// Default constructor
1391e633 57}
d4bb94a1 58
a9e2aefa 59//___________________________________________
60AliMUONv1::AliMUONv1(const char *name, const char *title)
d4bb94a1 61 : AliMUON(name,title),
62 fStepManagerVersionOld(kFALSE),
63 fAngleEffect(kTRUE),
64 fStepMaxInActiveGas(0.6),
65 fStepSum(0x0),
66 fDestepSum(0x0),
67 fTrackMomentum(),
68 fTrackPosition(),
69 fElossRatio(0x0),
70 fAngleEffect10(0x0),
71 fAngleEffectNorma(0x0)
a9e2aefa 72{
d4bb94a1 73// Standard onstructor
74
ba030c0e 75 // By default include all stations
ba030c0e 76 AliMUONFactory factory;
77 factory.Build(this, title);
c33d9661 78
1391e633 79 fStepSum = new Float_t [AliMUONConstants::NCh()];
80 fDestepSum = new Float_t [AliMUONConstants::NCh()];
81 for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
82 fStepSum[i] =0.0;
83 fDestepSum[i]=0.0;
84 }
85 // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
86 fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.);
87 fElossRatio->SetParameter(0,1.02138);
88 fElossRatio->SetParameter(1,-9.54149e-02);
89 fElossRatio->SetParameter(2,+7.83433e-02);
90 fElossRatio->SetParameter(3,-9.98208e-03);
91 fElossRatio->SetParameter(4,+3.83279e-04);
92
93 // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
94 fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
95 fAngleEffect10->SetParameter(0, 1.90691e+02);
96 fAngleEffect10->SetParameter(1,-6.62258e+01);
97 fAngleEffect10->SetParameter(2,+1.28247e+01);
98 // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
99 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
100 fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
101 fAngleEffectNorma->SetParameter(0,4.148);
102 fAngleEffectNorma->SetParameter(1,-6.809e-01);
103 fAngleEffectNorma->SetParameter(2,5.151e-02);
104 fAngleEffectNorma->SetParameter(3,-1.490e-03);
a9e2aefa 105}
106
fb1bf5c0 107//_____________________________________________________________________________
108AliMUONv1::AliMUONv1(const AliMUONv1& right)
109 : AliMUON(right)
110{
111 // copy constructor (not implemented)
112
113 Fatal("AliMUONv1", "Copy constructor not provided.");
114}
115
a9e2aefa 116//___________________________________________
acc838fd 117AliMUONv1::~AliMUONv1()
a9e2aefa 118{
acc838fd 119// Destructor
a9e2aefa 120
d4bb94a1 121 delete [] fStepSum;
122 delete [] fDestepSum;
123 delete fElossRatio;
124 delete fAngleEffect10;
125 delete fAngleEffectNorma;
acc838fd 126}
b17c0c87 127
fb1bf5c0 128//_____________________________________________________________________________
129AliMUONv1& AliMUONv1::operator=(const AliMUONv1& right)
130{
131 // assignement operator (not implemented)
132
133 // check assignement to self
134 if (this == &right) return *this;
135
136 Fatal("operator =", "Assignement operator not provided.");
137
138 return *this;
139}
140
acc838fd 141//__________________________________________________
142void AliMUONv1::CreateGeometry()
143{
b17c0c87 144//
d4bb94a1 145// Construct geometry using geometry builder
a9e2aefa 146//
a9e2aefa 147
d4bb94a1 148 fGeometryBuilder->CreateGeometry();
acc838fd 149}
a9e2aefa 150
acc838fd 151//________________________________________________________________
a9e2aefa 152void AliMUONv1::CreateMaterials()
153{
a9e2aefa 154//
d4bb94a1 155// Construct materials using geometry builder
156//
acc838fd 157
d4bb94a1 158 fGeometryBuilder->CreateMaterials();
a9e2aefa 159}
160
acc838fd 161//___________________________________________
a9e2aefa 162void AliMUONv1::Init()
163{
164 //
165 // Initialize Tracking Chambers
166 //
167
9e1a0ddb 168 if(fDebug) printf("\n%s: Start Init for version 1 - CPC chamber type\n\n",ClassName());
e17592e9 169 Int_t i;
f665c1ea 170 for (i=0; i<AliMUONConstants::NCh(); i++) {
a9e2aefa 171 ( (AliMUONChamber*) (*fChambers)[i])->Init();
172 }
173
174 //
d4bb94a1 175 // Initialize geometry
acc838fd 176 //
d4bb94a1 177 fGeometryBuilder->InitGeometry();
9e1a0ddb 178 if(fDebug) printf("\n%s: Finished Init for version 1 - CPC chamber type\n",ClassName());
a9e2aefa 179
180 //cp
9e1a0ddb 181 if(fDebug) printf("\n%s: Start Init for Trigger Circuits\n",ClassName());
f665c1ea 182 for (i=0; i<AliMUONConstants::NTriggerCircuit(); i++) {
a9e2aefa 183 ( (AliMUONTriggerCircuit*) (*fTriggerCircuits)[i])->Init(i);
184 }
9e1a0ddb 185 if(fDebug) printf("%s: Finished Init for Trigger Circuits\n",ClassName());
a9e2aefa 186 //cp
a9e2aefa 187}
1391e633 188
d4bb94a1 189//__________________________________________________________________
190Int_t AliMUONv1::GetChamberId(Int_t volId) const
191{
192// Check if the volume with specified volId is a sensitive volume (gas)
193// of some chamber and returns the chamber number;
194// if not sensitive volume - return 0.
195// ---
196
197/*
198 for (Int_t i = 1; i <= AliMUONConstants::NCh(); i++)
199 if (volId==((AliMUONChamber*)(*fChambers)[i-1])->GetGid()) return i;
200*/
201 for (Int_t i = 1; i <= AliMUONConstants::NCh(); i++)
202 if ( ((AliMUONChamber*)(*fChambers)[i-1])->IsSensId(volId) ) return i;
203
204 return 0;
205}
1391e633 206//_______________________________________________________________________________
c33d9661 207void AliMUONv1::StepManager()
208{
d7c4fbc4 209 // Stepmanager for the chambers
210
1391e633 211 if (fStepManagerVersionOld) {
c33d9661 212 StepManagerOld();
213 return;
214 }
c33d9661 215
216 // Only charged tracks
217 if( !(gMC->TrackCharge()) ) return;
1391e633 218 // Only charged tracks
219
c33d9661 220 // Only gas gap inside chamber
221 // Tag chambers and record hits when track enters
acc838fd 222 static Int_t idvol=-1;
1391e633 223 Int_t iChamber=0;
224 Int_t id=0;
225 Int_t copy;
226 const Float_t kBig = 1.e10;
227
acc838fd 228
229 //
230 // Only gas gap inside chamber
231 // Tag chambers and record hits when track enters
c33d9661 232 id=gMC->CurrentVolID(copy);
acc838fd 233 iChamber = GetChamberId(id);
234 idvol = iChamber -1;
235
236 if (idvol == -1) return;
abaf7c9d 237
967a2a25 238 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
239 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) )
240 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
241
1391e633 242 if( gMC->IsTrackEntering() ) {
243 Float_t theta = fTrackMomentum.Theta();
4ac9d21e 244 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
245 }
abaf7c9d 246
1391e633 247// if (GetDebug()) {
248// Float_t z = ( (AliMUONChamber*)(*fChambers)[idvol])->Z() ;
249// Info("StepManager Step","Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber, z);
250// }
251 // Particule id and mass,
252 Int_t ipart = gMC->TrackPid();
253 Float_t mass = gMC->TrackMass();
254
255 fDestepSum[idvol]+=gMC->Edep();
256 // Get current particle id (ipart), track position (pos) and momentum (mom)
257 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
258 fStepSum[idvol]+=gMC->TrackStep();
abaf7c9d 259
1391e633 260// if (GetDebug()) {
261// Info("StepManager Step","iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
acc838fd 262// iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg, mass, fStepSum[idvol], gMC->Edep());
1391e633 263// Info("StepManager Step","Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(), fTrackMomentum.Z()) ;
264// gMC->TrackPosition(fTrackPosition);
265// Info("StepManager Step","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
d08aff2d 266// }
1391e633 267
268 // Track left chamber or StepSum larger than fStepMaxInActiveGas
269 if ( gMC->IsTrackExiting() ||
270 gMC->IsTrackStop() ||
271 gMC->IsTrackDisappeared()||
272 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
273
274 if ( gMC->IsTrackExiting() ||
acc838fd 275 gMC->IsTrackStop() ||
276 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
1391e633 277
278 gMC->TrackPosition(fTrackPosition);
279 Float_t theta = fTrackMomentum.Theta();
280 Float_t phi = fTrackMomentum.Phi();
281
d7c4fbc4 282 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
acc838fd 283 fStepSum[idvol]/2.*sin(theta)*sin(phi),
284 fStepSum[idvol]/2.*cos(theta),0.0 );
1391e633 285 // if (GetDebug())
286 // Info("StepManager Exit","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
287 // if (GetDebug())
d7c4fbc4 288 // Info("StepManager Exit ","Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z()) ;
289 fTrackPosition-=backToWire;
1391e633 290
291 //-------------- Angle effect
292 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
293
30178c30 294 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
d7c4fbc4 295 Float_t sigmaEffect10degrees;
296 Float_t sigmaEffectThetadegrees;
297 Float_t eLossParticleELossMip;
298 Float_t yAngleEffect=0.;
299 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
300
374ebd7d 301
302 if (fAngleEffect){
30178c30 303 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
304 betaxGamma=TMath::Log(betaxGamma);
305 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
1391e633 306 // 10 degrees is a reference for a model (arbitrary)
d7c4fbc4 307 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
1391e633 308 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
d7c4fbc4 309 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
1391e633 310 if ( (iChamber==1) || (iChamber==2) )
acc838fd 311 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
d7c4fbc4 312 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
1391e633 313 }
374ebd7d 314 }
1391e633 315
316 // One hit per chamber
47464038 317 GetMUONData()->AddHit(fIshunt,
318 gAlice->GetMCApp()->GetCurrentTrackNumber(),
319 iChamber, ipart,
320 fTrackPosition.X(),
321 fTrackPosition.Y()+yAngleEffect,
322 fTrackPosition.Z(),
323 gMC->TrackTime(),
324 fTrackMomentum.P(),
325 theta,
326 phi,
327 fStepSum[idvol],
328 fDestepSum[idvol],
329 fTrackPosition.X(),
330 fTrackPosition.Y(),
331 fTrackPosition.Z());
332
1391e633 333// if (GetDebug()){
334// Info("StepManager Exit","Particle exiting from chamber %d",iChamber);
335// Info("StepManager Exit","StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]);
336// Info("StepManager Exit","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
337// }
338 fStepSum[idvol] =0; // Reset for the next event
339 fDestepSum[idvol]=0; // Reset for the next event
340 }
abaf7c9d 341}
5f91c9e8 342
4ac9d21e 343//__________________________________________
c33d9661 344void AliMUONv1::StepManagerOld()
a9e2aefa 345{
d7c4fbc4 346 // Old Stepmanager for the chambers
a9e2aefa 347 Int_t copy, id;
acc838fd 348 static Int_t idvol =-1;
a9e2aefa 349 static Int_t vol[2];
350 Int_t ipart;
351 TLorentzVector pos;
352 TLorentzVector mom;
353 Float_t theta,phi;
354 Float_t destep, step;
abaf7c9d 355
d7c4fbc4 356 static Float_t sstep;
1e8fff9c 357 static Float_t eloss, eloss2, xhit, yhit, zhit, tof, tlength;
2eb55fab 358 const Float_t kBig = 1.e10;
a9e2aefa 359 static Float_t hits[15];
360
361 TClonesArray &lhits = *fHits;
362
363 //
a9e2aefa 364 //
365 // Only charged tracks
366 if( !(gMC->TrackCharge()) ) return;
367 //
368 // Only gas gap inside chamber
369 // Tag chambers and record hits when track enters
a9e2aefa 370 id=gMC->CurrentVolID(copy);
5f91c9e8 371 vol[0] = GetChamberId(id);
372 idvol = vol[0] -1;
373
374 if (idvol == -1) return;
375
a9e2aefa 376 //
377 // Get current particle id (ipart), track position (pos) and momentum (mom)
378 gMC->TrackPosition(pos);
379 gMC->TrackMomentum(mom);
380
381 ipart = gMC->TrackPid();
a9e2aefa 382
383 //
384 // momentum loss and steplength in last step
385 destep = gMC->Edep();
386 step = gMC->TrackStep();
abaf7c9d 387 // cout<<"------------"<<step<<endl;
a9e2aefa 388 //
389 // record hits when track enters ...
390 if( gMC->IsTrackEntering()) {
abaf7c9d 391
a9e2aefa 392 gMC->SetMaxStep(fMaxStepGas);
393 Double_t tc = mom[0]*mom[0]+mom[1]*mom[1];
394 Double_t rt = TMath::Sqrt(tc);
395 Double_t pmom = TMath::Sqrt(tc+mom[2]*mom[2]);
2eb55fab 396 Double_t tx = mom[0]/pmom;
397 Double_t ty = mom[1]/pmom;
398 Double_t tz = mom[2]/pmom;
399 Double_t s = ((AliMUONChamber*)(*fChambers)[idvol])
acc838fd 400 ->ResponseModel()
401 ->Pitch()/tz;
a9e2aefa 402 theta = Float_t(TMath::ATan2(rt,Double_t(mom[2])))*kRaddeg;
403 phi = Float_t(TMath::ATan2(Double_t(mom[1]),Double_t(mom[0])))*kRaddeg;
404 hits[0] = Float_t(ipart); // Geant3 particle type
2eb55fab 405 hits[1] = pos[0]+s*tx; // X-position for hit
406 hits[2] = pos[1]+s*ty; // Y-position for hit
407 hits[3] = pos[2]+s*tz; // Z-position for hit
a9e2aefa 408 hits[4] = theta; // theta angle of incidence
409 hits[5] = phi; // phi angle of incidence
ce3f5e87 410 hits[8] = 0;//PadHits does not exist anymore (Float_t) fNPadHits; // first padhit
a9e2aefa 411 hits[9] = -1; // last pad hit
2eb55fab 412 hits[10] = mom[3]; // hit momentum P
413 hits[11] = mom[0]; // Px
414 hits[12] = mom[1]; // Py
415 hits[13] = mom[2]; // Pz
a9e2aefa 416 tof=gMC->TrackTime();
2eb55fab 417 hits[14] = tof; // Time of flight
418 tlength = 0;
419 eloss = 0;
420 eloss2 = 0;
d7c4fbc4 421 sstep=0;
2eb55fab 422 xhit = pos[0];
423 yhit = pos[1];
424 zhit = pos[2];
681d067b 425 Chamber(idvol).ChargeCorrelationInit();
a9e2aefa 426 // Only if not trigger chamber
1e8fff9c 427
abaf7c9d 428// printf("---------------------------\n");
429// printf(">>>> Y = %f \n",hits[2]);
430// printf("---------------------------\n");
431
1e8fff9c 432
433
abaf7c9d 434 // if(idvol < AliMUONConstants::NTrackingCh()) {
acc838fd 435// //
436// // Initialize hit position (cursor) in the segmentation model
437// ((AliMUONChamber*) (*fChambers)[idvol])
438// ->SigGenInit(pos[0], pos[1], pos[2]);
abaf7c9d 439// } else {
acc838fd 440// //geant3->Gpcxyz();
441// //printf("In the Trigger Chamber #%d\n",idvol-9);
abaf7c9d 442// }
a9e2aefa 443 }
444 eloss2+=destep;
d7c4fbc4 445 sstep+=step;
abaf7c9d 446
d7c4fbc4 447 // cout<<sstep<<endl;
abaf7c9d 448
a9e2aefa 449 //
450 // Calculate the charge induced on a pad (disintegration) in case
451 //
452 // Mip left chamber ...
453 if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
454 gMC->SetMaxStep(kBig);
455 eloss += destep;
456 tlength += step;
457
802a864d 458 Float_t x0,y0,z0;
459 Float_t localPos[3];
460 Float_t globalPos[3] = {pos[0], pos[1], pos[2]};
802a864d 461 gMC->Gmtod(globalPos,localPos,1);
462
2eb55fab 463 if(idvol < AliMUONConstants::NTrackingCh()) {
a9e2aefa 464// tracking chambers
acc838fd 465 x0 = 0.5*(xhit+pos[0]);
466 y0 = 0.5*(yhit+pos[1]);
467 z0 = 0.5*(zhit+pos[2]);
a9e2aefa 468 } else {
469// trigger chambers
acc838fd 470 x0 = xhit;
471 y0 = yhit;
472 z0 = 0.;
a9e2aefa 473 }
474
1e8fff9c 475
ce3f5e87 476 // if (eloss >0) MakePadHits(x0,y0,z0,eloss,tof,idvol);
a9e2aefa 477
acc838fd 478
2eb55fab 479 hits[6] = tlength; // track length
480 hits[7] = eloss2; // de/dx energy loss
481
abaf7c9d 482
ce3f5e87 483 // if (fNPadHits > (Int_t)hits[8]) {
acc838fd 484 // hits[8] = hits[8]+1;
485 // hits[9] = 0: // PadHits does not exist anymore (Float_t) fNPadHits;
ce3f5e87 486 //}
2eb55fab 487//
488// new hit
489
a9e2aefa 490 new(lhits[fNhits++])
acc838fd 491 AliMUONHit(fIshunt, gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
a9e2aefa 492 eloss = 0;
493 //
494 // Check additional signal generation conditions
495 // defined by the segmentation
a75f073c 496 // model (boundary crossing conditions)
497 // only for tracking chambers
a9e2aefa 498 } else if
a75f073c 499 ((idvol < AliMUONConstants::NTrackingCh()) &&
500 ((AliMUONChamber*) (*fChambers)[idvol])->SigGenCond(pos[0], pos[1], pos[2]))
a9e2aefa 501 {
502 ((AliMUONChamber*) (*fChambers)[idvol])
acc838fd 503 ->SigGenInit(pos[0], pos[1], pos[2]);
802a864d 504
505 Float_t localPos[3];
506 Float_t globalPos[3] = {pos[0], pos[1], pos[2]};
507 gMC->Gmtod(globalPos,localPos,1);
508
e0f71fb7 509 eloss += destep;
802a864d 510
ce3f5e87 511 // if (eloss > 0 && idvol < AliMUONConstants::NTrackingCh())
acc838fd 512 // MakePadHits(0.5*(xhit+pos[0]),0.5*(yhit+pos[1]),pos[2],eloss,tof,idvol);
a9e2aefa 513 xhit = pos[0];
514 yhit = pos[1];
e0f71fb7 515 zhit = pos[2];
516 eloss = 0;
a9e2aefa 517 tlength += step ;
518 //
519 // nothing special happened, add up energy loss
520 } else {
521 eloss += destep;
522 tlength += step ;
523 }
524}