Re: (no subject)

From: Dmitry Naumov <naumov_at_nusun.jinr.ru>
Date: Tue, 03 May 2005 11:49:52 +0200

Dear VMC developers,

I am adapting Ex03 for my application in which I build geometry via TGeo and use vgm for converting it into g4 internally in memory. Some things are not yet clear to me:

• naming conventions. My TGeoVolumes have names like: ScintPlateL_1_2 it seems that G4 does not recongnize when the name contains underscores, G4 releases warnings. I modified names to like follows: ScintPlateLX1X2 and they are recognized, while a warning persists:

id 1131 Energy release:1.26048e-05 step 0.000188367 Track 167.747 5.70718 10.3102 in ScintPlateLX1X2 ++++ TG4Warning: ++++

    TG4StepManager::GetCurrentOffPhysicalVolume:     Volume ScintPlateLX1X2 has not defined mother in the required level.

This is the output of the following lines:

//_____________________________________________________________________________

void MCApplication::Stepping() {

    // User actions at each step
    // ---

    fVerbose.Stepping();
    TLorentzVector position;
    gMC->TrackPosition(position);  

    cout << "Track "

       << position.X() << " " << position.Y() << " " << position.Z()
       << "  in " <<  gMC->CurrentVolName() << "  " << endl;

  Int_t copyNo;
  Int_t id = gMC->CurrentVolID(copyNo);

  gMC->CurrentVolOffID(2, copyNo);  

  Double_t edep = gMC->Edep();

  Double_t step = 0.;
  if (gMC->TrackCharge() != 0.) step = gMC->TrackStep();   

  cout << "id " << id << " Energy release:"

       << edep << " step " << step << endl;  

}

• When the event is generated I see with G4 OpenGL viewer my detector and tracks inside it. That viewer does not look too nice and I would like to use root TGeo package as a viewer. The detector can be viweved without any problems, however I would like to fetch G4 generated tracks and draw them with TGeo "viewer". What is the way these tracks can be accessed and drawn?

Sorry for a lot of questions, perhaps they are too trivial...

Thank you very much in advaince,

Dmitry Received on Tue May 03 2005 - 09:54:41 MEST