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GeneratorFromFile.cxx
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154 lines (137 loc) · 4.94 KB
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// Copyright CERN and copyright holders of ALICE O2. This software is
// distributed under the terms of the GNU General Public License v3 (GPL
// Version 3), copied verbatim in the file "COPYING".
//
// See http://alice-o2.web.cern.ch/license for full licensing information.
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
#include "Generators/GeneratorFromFile.h"
#include <FairLogger.h>
#include <FairPrimaryGenerator.h>
#include <TBranch.h>
#include <TClonesArray.h>
#include <TFile.h>
#include <TParticle.h>
#include <TTree.h>
#include <sstream>
namespace o2
{
namespace eventgen
{
GeneratorFromFile::GeneratorFromFile(const char* name)
{
mEventFile = TFile::Open(name);
if (mEventFile == nullptr) {
LOG(FATAL) << "EventFile " << name << " not found \n";
return;
}
// the kinematics will be stored inside a Tree "TreeK" with branch "Particles"
// different events are stored inside TDirectories
// we need to probe for the number of events
TObject* object = nullptr;
do {
std::stringstream eventstringstr;
eventstringstr << "Event" << mEventsAvailable;
// std::cout << "probing for " << eventstring << "\n";
object = mEventFile->Get(eventstringstr.str().c_str());
// std::cout << "got " << object << "\n";
if (object != nullptr)
mEventsAvailable++;
} while (object != nullptr);
LOG(INFO) << "Found " << mEventsAvailable << " events in this file \n";
}
void GeneratorFromFile::SetStartEvent(int start)
{
if (start < mEventsAvailable) {
mEventCounter = start;
} else {
LOG(ERROR) << "start event bigger than available events\n";
}
}
bool isOnMassShell(TParticle const& p)
{
const auto nominalmass = p.GetMass();
auto calculatedmass = p.Energy() * p.Energy() - (p.Px() * p.Px() + p.Py() * p.Py() + p.Pz() * p.Pz());
calculatedmass = (calculatedmass >= 0.) ? std::sqrt(calculatedmass) : -std::sqrt(-calculatedmass);
const double tol = 1.E-4;
auto difference = std::abs(nominalmass - calculatedmass);
LOG(DEBUG) << "ISONMASSSHELL INFO" << difference << " " << nominalmass << " " << calculatedmass;
return std::abs(nominalmass - calculatedmass) < tol;
}
Bool_t GeneratorFromFile::ReadEvent(FairPrimaryGenerator* primGen)
{
if (mEventCounter < mEventsAvailable) {
int particlecounter = 0;
// get the tree and the branch
std::stringstream treestringstr;
treestringstr << "Event" << mEventCounter << "/TreeK";
TTree* tree = (TTree*)mEventFile->Get(treestringstr.str().c_str());
if (tree == nullptr) {
return kFALSE;
}
auto branch = tree->GetBranch("Particles");
TParticle* particle = nullptr;
branch->SetAddress(&particle);
LOG(INFO) << "Reading " << branch->GetEntries() << " particles from Kinematics file";
// read the whole kinematics initially
std::vector<TParticle> particles;
for (int i = 0; i < branch->GetEntries(); ++i) {
branch->GetEntry(i);
particles.push_back(*particle);
}
// filter the particles from Kinematics.root originally put by a generator
// and which are trackable
auto isFirstTrackableDescendant = [](TParticle const& p) {
// according to the current understanding in AliRoot, we
// have status code:
// == 0 <---> particle is put by transportation
// == 1 <---> particle is trackable
// != 1 but different from 0 <---> particle is not directly trackable
// Note: This might have to be refined (using other information such as UniqueID)
if (p.GetStatusCode() == 1) {
return true;
}
return false;
};
for (int i = 0; i < branch->GetEntries(); ++i) {
auto& p = particles[i];
if (!isFirstTrackableDescendant(p)) {
continue;
}
auto pdgid = p.GetPdgCode();
auto px = p.Px();
auto py = p.Py();
auto pz = p.Pz();
auto vx = p.Vx();
auto vy = p.Vy();
auto vz = p.Vz();
// a status of 1 means "trackable" in AliRoot kinematics
auto status = p.GetStatusCode();
bool wanttracking = status == 1;
if (wanttracking || !mSkipNonTrackable) {
auto parent = -1;
auto e = p.Energy();
auto tof = p.T();
auto weight = p.GetWeight();
if (!isOnMassShell(p)) {
LOG(WARNING) << "Skipping " << pdgid << " since off-mass shell";
continue;
}
LOG(DEBUG) << "Putting primary " << pdgid << " " << p.GetStatusCode() << " " << p.GetUniqueID();
primGen->AddTrack(pdgid, px, py, pz, vx, vy, vz, parent, wanttracking, e, tof, weight);
particlecounter++;
}
}
mEventCounter++;
LOG(INFO) << "Event generator put " << particlecounter << " on stack";
return kTRUE;
} else {
LOG(ERROR) << "GeneratorFromFile: Ran out of events\n";
}
return kFALSE;
}
} // end namespace
} // end namespace o2
ClassImp(o2::eventgen::GeneratorFromFile)