Here is a list of all files with brief descriptions:

[detail level 123]

examples
g4system_example.cc	Example showing how to instantiate g4system options, build a GEMC world, and build the Geant4 world
g4objectsFactories
cad
buildSolid.cc	Implementation of the CAD-mesh solid builder for G4CadSystemFactory
cadSystemFactory.h	Factory that converts CAD files (PLY / STL) into Geant4 tessellated solids via CADMesh
g4native
buildSolid.cc	Implementation of G4NativeSystemFactory::buildSolid()
checkAndReturnParameters.cc	Implementation of G4NativeSystemFactory helpers, including the parameter-count validator
g4NativeObjectsFactory.h	Factory that builds Geant4 native primitive solids (`G4Box`, `G4Cons`, `G4Trap`, ...) from GEMC `GVolume` records
g4objectsFactory.cc	Default implementations shared by all detector-specific factories
g4objectsFactory.h	Abstract factory that converts a GEMC DB `GVolume` into Geant4 objects
geant4Dependencies.cc	Dependency checks used by g4system factories before constructing solids and placements
g4materials.cc
g4mirrors.cc	Implementation of G4World optical surface construction (phase 5)
g4system_options.cc	Implementation of g4system option registration
g4system_options.h	Option definitions for the g4system module (geometry/material construction layer)
g4systemConventions.h	Conventions, labels, and error codes used by the g4system geometry/material layer
g4systemDoxy.h
g4volume.cc	Implementation of the small pointer-holder utilities in G4Volume
g4volume.h	Thin wrapper that stores the Geant4 solid/logical/physical triple for one GEMC volume
g4world.cc	Implementation of G4World, including factory creation, material building, and volume dependency resolution
g4world.h	High-level builder that turns a GEMC world description into Geant4 geometry