Here are the data structures with brief descriptions:
| CG4CadSystemFactory | Builds a tessellated solid from CAD files using CADMesh |
| CG4NativeSystemFactory | Implements solid creation for Geant4 CSG primitives and validates constructor parameter counts |
| CG4ObjectsFactory | Base class orchestrating the conversion of a GVolume into a Geant4 representation |
| CG4Volume | Convenience container holding a Geant4 solid, logical, and physical volume |
| CG4World | Builds a full Geant4 geometry "world" from a GEMC GWorld description |