AliSimDigits();
virtual ~AliSimDigits();
void AllocateTrack(Int_t length); //construct empty buffer fTracks with size rows x column x length (number of tracks for one digit)
+ Int_t *GetTracks(){return fTracks->GetArray();}
Int_t GetTrackIDFast(Int_t row, Int_t column,Int_t level); //return track ID at given row and collumn
void SetTrackIDFast(Int_t value,Int_t row, Int_t column,Int_t level); //set ID track at given row and collumn
virtual Int_t GetTrackID(Int_t row, Int_t column, Int_t level);