Hi pawel

I had already looked into this before, It was not quite as simple as to remove the //! in the
hitlist, since we do not always want to write this out (filesize +15%) The changes describe 
below to brat should make this work. I tested it on a newly generated ltr-file, and both reading of
old and new files seems fine.

I will rerun the pp data from 11880 and 11882 (the last two runs with hits kept) so you can invertigate
later we can of course run other specific runs with the hits stored, but would not like to do it for all.

flemming



There has been discussion on how to check the t2,t1 position using t3 tracks. 
This was almost possible with the current brat classes and the hit information used locally
in BrTpcTrackCandidate. Since we do though not always want to write this information to disk
methods had to be added to deal with this properly.
Another complication was that the hist are owned by the brannch that has all hits in a TPC.

Changes was made to the various dataclasses such this would be simple.
Essentially if you add the statement to the local tracking it works.

//    trackPackage->SetHitsInOutput(kTRUE);

and the results can be inspected e.g. b

  frtpc = inEvent ->GetDataTable(Form("TpcTrack %s", frname.Data()));	
  // front TPC tracks
  if(frtpc){

    int mk=0;
    for (Int_t t = 0; t < frtpc->GetEntries(); t++) 
      {
	BrTpcTrackCandidate* tptrk = (BrTpcTrackCandidate*) frtpc->At(t);
	const Int_t nhit = tptrk->GetNhit();
	cout << nhit << endl;
	for(int k = 0;k<nhit;k++){
	  BrTpcHit* hit = tptrk->GetHitAt(k);
	  if(hit){
	    BrVector3D ent  = hit->GetPos();
...

etc



BrTrackCandidate

//____________________________________________________________________
// 
//  During normal usage the hits associated with tracks are kept during 
//  the localtracking part but removed at the end but the TpcTrackFollowModule.
//  At times it can be usefull to keep the tracks, this can be done by
//  setting the following flag in the BrTpcTrackPackage
//
//    BrTpcTrackPackage* trackPackage = 
//      new BrTpcTrackPackage(tpcNames[i], "tracking Module");
//    
//    trackPackage->SetHitsInOutput(kTRUE);
// The container of hits are kepr in a TRefArray since the hits are usual
// contained in anoter BrDataTable (TObjArray) and in order to be written out
// effeciently the TRef mechanism is just perfect.
//

The classdef was updated to 2.

BrTpcTrackPackage

//  During normal usage the hits associated with tracks are kept during 
//  the localtracking part but removed at the end but the TpcTrackFollowModule.
//  At times it can be usefull to keep the tracks, this can be done by
//  setting the following flag in the BrTpcTrackPackage
//
//    BrTpcTrackPackage* trackPackage = 
//      new BrTpcTrackPackage(tpcNames[i], "tracking Module");
//    
//    trackPackage->SetHitsInOutput(kTRUE);