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IterativeVertexFinderExample.cpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2019 CERN for the benefit of the Acts project
4 //
5 // This Source Code Form is subject to the terms of the Mozilla Public
6 // License, v. 2.0. If a copy of the MPL was not distributed with this
7 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 
16 
17 #include <memory>
18 
19 using namespace Acts::UnitLiterals;
20 using namespace ActsExamples;
21 
22 int main(int argc, char* argv[]) {
23  // setup and parse options
24  auto desc = Options::makeDefaultOptions();
28  ParticleSelector::addOptions(desc);
30  auto vars = Options::parse(desc, argc, argv);
31  if (vars.empty()) {
32  return EXIT_FAILURE;
33  }
34 
35  // basic setup
36  auto logLevel = Options::readLogLevel(vars);
37  auto rnd =
38  std::make_shared<RandomNumbers>(Options::readRandomNumbersConfig(vars));
39  Sequencer sequencer(Options::readSequencerConfig(vars));
40 
41  // setup event generator
43  evgen.outputParticles = "particles_generated";
44  evgen.randomNumbers = rnd;
45  sequencer.addReader(std::make_shared<EventGenerator>(evgen, logLevel));
46 
47  // pre-select particles
48  ParticleSelector::Config selectParticles = ParticleSelector::readConfig(vars);
49  selectParticles.inputParticles = evgen.outputParticles;
50  selectParticles.outputParticles = "particles_selected";
51  // smearing only works with charge particles for now
52  selectParticles.removeNeutral = true;
53  sequencer.addAlgorithm(
54  std::make_shared<ParticleSelector>(selectParticles, logLevel));
55 
56  // simulate track reconstruction by smearing truth track parameters
57  ParticleSmearing::Config smearParticles;
58  smearParticles.inputParticles = selectParticles.outputParticles;
59  smearParticles.outputTrackParameters = "trackparameters";
60  smearParticles.randomNumbers = rnd;
61  sequencer.addAlgorithm(
62  std::make_shared<ParticleSmearing>(smearParticles, logLevel));
63 
64  // find vertices
66  findVertices.inputTrackParameters = smearParticles.outputTrackParameters;
67  findVertices.outputProtoVertices = "protovertices";
68  findVertices.bField = Acts::Vector3D(0_T, 0_T, 2_T);
69  sequencer.addAlgorithm(
70  std::make_shared<IterativeVertexFinderAlgorithm>(findVertices, logLevel));
71 
72  return sequencer.run();
73 }