[Freesurfer] Volume Version of ?h.sphere.reg and method to read it

Dear Freesurfer Team,

I am using your reconstruction pipeline for my study. Since I need to morph all my subjects to an average subject (using mne-python for this) for upcoming a Volume Source Analysis I deeply looked into the whole source-code of both software packages. Narowing down the problem, I think I will need a volume version of the ?h-sphere.reg files, which are created during the whole reconstruction process.

Mne-python reads the subject specific 'sphere_tris' from this file. If I would have a similiar file for the volume edges that would be helpful.

Do you agree with my conclusion and see where I am going?

Thanks in advance for any kind of help.

Yours sincerely,

Daniel van de Velden

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