void eventDisplay()
{
  TString dataDir   = "./";
  TString InputFile = dataDir + "exercise.mc.root";
  TString ParFile   = dataDir + "exercise.par.root";

  // -----   Reconstruction run   -------------------------------------------
  FairRunAna *fRun= new FairRunAna();

  FairFileSource* inputSource = new FairFileSource(InputFile.Data());
  fRun->SetSource(inputSource);
  fRun->SetOutputFile(dataDir + "exercise.evtDisp.root");

  FairRuntimeDb* rtdb = fRun->GetRuntimeDb();
  FairParRootFileIo* parInput1 = new FairParRootFileIo();
  parInput1->open(ParFile.Data());
  rtdb->setFirstInput(parInput1);

  FairEventManager *fMan  = new FairEventManager();
  FairMCTracks     *Track = new FairMCTracks ("Monte-Carlo Tracks");

  FairMCPointDraw  *MvdPoint      = new FairMCPointDraw ("MvdPoint",      kBlack,  kFullSquare);
  FairMCPointDraw  *StsPoint      = new FairMCPointDraw ("StsPoint",      kBlue,   kFullSquare);
  FairMCPointDraw  *MuchPoint     = new FairMCPointDraw ("MuchPoint",     kOrange, kFullSquare);
  FairMCPointDraw  *TrdPoint      = new FairMCPointDraw ("TrdPoint",      kCyan,   kFullSquare);
  FairMCPointDraw  *TofPoint      = new FairMCPointDraw ("TofPoint",      kGreen,  kFullSquare);
  FairMCPointDraw  *EcalPoint     = new FairMCPointDraw ("EcalPoint",     kYellow, kFullSquare);

  fMan->AddTask(Track);

  fMan->AddTask(MvdPoint);
  fMan->AddTask(StsPoint);
  fMan->AddTask(MuchPoint);
  fMan->AddTask(TrdPoint);
  fMan->AddTask(TofPoint);
  fMan->AddTask(EcalPoint);
 
    
  //  fMan->Init(1,4,10000);
  fMan->Init(1,5,10000);  // make STS visible by default
  //  fMan->Init(1,6,10000);  // make MVD visible by default

  // Florian can tell why this is necessary.
  RemoveGeoManager();

}