[Mne_analysis] Problem with BEm construction

[Alexandre Gramfort]

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hi Edoardo,

I suspect your triangles are oriented inwards or outwards with the opposite
convention as MNE. You can fix this if you have the triangles

triangles = triangles[:, ::-1]

or the fliplr function in matlab.

HTH
Alex


On Mon, May 25, 2020 at 12:38 PM Edoardo Pinzuti <edoardo.pinzuti at gmail.com>
wrote:

>         External Email - Use Caution
>
> Dear MNE team,
>
> I many of my subjects the watershed algorithm gives poor results. So  I
> decided to  create BEM based on the inner skull boundary from fiedltrip. I
> saved the output from fieldtrip as surface format but when I pass
> inner_skull.surf to the function  make_bem function I get :
> Creating the BEM geometry...
> inner skull CM is   1.05  -0.61  59.80 mm
> RuntimeError: Surface inner skull is not complete (sum of solid angles
> yielded -1, should be 1.)
> When I visualize the surface  does not seems to have any problem
>
> Do you know what could cause the error?
>
> Thanks
>
>
>
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