[Mne_analysis] How to create a sphere file to compute source space?

[Alexandre Gramfort]

hi,

> I would like to create a forward solution using source space
> (mne.setup_source_space).
>
> I’ve created the surface mesh from Brainvisa but I don’t have the sphere
> file (.sphere) to compute a source space.

you cannot generate a source space with MNE for a surface not produced
by freesurfer.
at least not easily without hacking the MNE data structures.

> How can I create it in MNE ? I’m thinking to use mne.make_sphere_model but
> I’m not sure how it works.

the make_sphere_model is for the forward model and is unrelated with
the freesurfer .sphere files that are used for source space
subsampling.

I really recommend you use freesurfer to generate your cortical
surfaces. Unless it does not work it will make your life much easier
with MNE.

HTH
Alex

> Any help or suggestion would be appreciated!
>
>
> Thanks.
>
>
> Alexandre F
>
>
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