Guidance needed on using #geometry_objects_read with HDF5 geometry

[Mehul Bagaria]

Hello everyone,

I have been trying to use the #geometry_objects_read feature in gprMax
(https://docs.gprmax.com/en/latest/input.html#geometry-objects-read)
to build external geometry along with material property definitions and then load them directly into a simulation.

From the documentation, I understand that the geometry and material information should be provided in HDF5 format. However, I have not been able to find a clear description of the expected HDF5 file structure for this feature (datasets, naming conventions, dimensions, etc.).

Could anyone please:

• share a working example HDF5 file, or

• point me to any reference code, example repository, or documentation that explains how to generate the required HDF5 geometry/material file?

Any guidance on how this feature is typically used in practice would be greatly appreciated.

Thank you in advance for your help.