Difference between revisions of "PhysicalVolumeInfoCollection"
| Line 12: | Line 12: | ||
volume in which the particle was born and the other describes the volume in which | volume in which the particle was born and the other describes the volume in which | ||
the particle stopped. | the particle stopped. | ||
| + | |||
| + | The components are: | ||
| + | * PhysicalVolumeInfo - a volume number and text name of the volume | ||
| + | * PhysicalVolumeInfoCollection - a vector of PhysicalVolumeInfo | ||
| + | * PhysicalVolumeInfoMultiCollection - a vector of PhysicalVolumeInfoCollection | ||
| + | |||
| + | The PhysicalVolumeInfoMultiCollection is needed because different stages of a simulation might use completely different geometries, which have different numbers for the volumes. | ||
[[Category:Computing]] | [[Category:Computing]] | ||
[[Category:Code]] | [[Category:Code]] | ||
Revision as of 15:01, 17 August 2017
This page page needs expert review!
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.
The components are:
- PhysicalVolumeInfo - a volume number and text name of the volume
- PhysicalVolumeInfoCollection - a vector of PhysicalVolumeInfo
- PhysicalVolumeInfoMultiCollection - a vector of PhysicalVolumeInfoCollection
The PhysicalVolumeInfoMultiCollection is needed because different stages of a simulation might use completely different geometries, which have different numbers for the volumes.