Importing ASCII Text Models
Since release 9.2 of Geant4, it is also possible to import geometry setups
based on a plain text description, according to a well defined syntax for
identifying the different geometrical entities (solids, volumes, materials
and volume attributes) with associated parameters.
An example showing how to define a geometry in plain text format and import
it in a Geant4 application is shown in
examples/extended/persistency/P03.