I hope it is there where I have to send this mail. I am trying to play with
geant4 and I found a bit "unexplained" how to build digits out of hits. Would it
be possible to get a simple example on how to do it ? I tried to follow the same
steps as with the hits, that is, derive a class from G4VDigi for my digits,
another one from G4VDigitizerModule and register it in my detector construction
through the DigiManager:

   G4DigiManager *fDM = G4DigiManager::GetDMpointer();
   PlaneDigitizer *mDig = new PlaneDigitizer("PlaneDigitizer");
   fDM->AddNewModule(mDig);

Then in my EndOfEventAction I call the Digitize method of my digitizer module
whre I fill my collection of digits. My first question is: should I assume that
I have to maintain myself the collection of hits ? That is, should I clear it
from one event to the other and how to do it ? At this respect I found that in
G4TDigiCollection there is no entries() method and therefore no way to know how
many digits are there. I added it, but the next problem is how to associate the
digits to G4DCofThisEvent. Looking hereand there in the source I found
G4VDigitizerModule::StoreDigiCollection. I used it, but that makes the program
crash persistenly.

Many thanks in advance,

			Carlos