The use of Geant4 to perform advanced space radiation analyses, over realistic S/C or P/L geometries, usually requires the radiation engineers to model the mass world combining a CAD/CAE design describing the mechanical structure, in turn an assembly of parts developed in parallel by collaborating teams, with specific Geant4 geometries natively built in GDML or with alternative descriptions coming from other physics simulation codes, such as TCAD tools for device simulation or the SPIS toolkit for plasma interaction.
Although there already exists solutions to import CAD/CAE designs, via STEP-GDML converters, or translate SPIS mesh geometries into Geant4, via specific Gmsh developments during the ELSHIELD project, however there is no common interface to load and combine multiple geometrical descriptions into a single simulation world.
A new set of new Geant4/GRAS geometrical classes will be presented, showing how users can easily load several geometrical designs, defined in the same or different format, and assemble them arbitrarily. Current implementation provides interfaces to combine files in GDML, Gmsh and STEP (via Gmsh) format. In addition, a preliminary geometry parser for TCAD layouts, based on CIF format, will be also presented.
