PhysicalVolumeInfoCollection: Difference between revisions
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Actually, the definition of a data product is slightly broader than this. | Actually, the definition of a data product is slightly broader than this. | ||
The <code>art::Run</code> object is just an <code>art::RunId</code> object plus a collection of data products; | The <code>art::Run</code> object is just an <code>art::RunId</code> object plus a collection of data products; | ||
similarly for the <code>art::SubRun</code> object. An example of a data product in the Run record | similarly for the <code>art::SubRun</code> object. An example of a data product in the Run record | ||
is | is PhysicalVolumeInfoCollection. When we intialize Geant4, we do it | ||
in the beginRun method of <code>Mu2eG4/src/G4_plugin.cc</code>. At the end of Geant4 | in the beginRun method of <code>Mu2eG4/src/G4_plugin.cc</code>. At the end of Geant4 | ||
initialization we | initialization we | ||
Revision as of 20:33, 14 April 2017
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Actually, the definition of a data product is slightly broader than this.
The art::Run object is just an art::RunId object plus a collection of data products;
similarly for the art::SubRun object. An example of a data product in the Run record
is PhysicalVolumeInfoCollection. When we intialize Geant4, we do it
in the beginRun method of Mu2eG4/src/G4_plugin.cc. At the end of Geant4
initialization we
create a std::vector of all physical volumes known to G4 and we put this
information into the art::Run object as a PhysicalVolumeInfoCollection.
The SimParticle class holds two indices into this collection; one describes the
volume in which the particle was born and the other describes the volume in which
the particle stopped.