[Mne_analysis] issue with brainsuite and bem ico_downsample

[Yvonne Yau]

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​Hi guys,
I'm having some issues with the BEM meshes for my EEG data.  I've tried two approaches:
(1) Using freesurfer watershed and trying different preflood levels, but it seems to do a bad job with the outer_skull.surf being misplaced (see attached image)
(2) I've had better success with using Brainsuite and have followed the guidelines; converting it from dfs to surf using mne_convert_surface, and then reducing the number of triangles to 10,000 using mne_reduce_surface.  When I try to run mne.make_bem_mode, I get the error:
File "/usr/anaconda3/envs/mne/lib/python3.6/site-packages/mne/bem.py", line 344, in _ico_downsample

raise RuntimeError(bad_msg)


RuntimeError: A surface with 10000 triangles cannot be isomorphic with a subdivided icosahedron.

Any ideas?

Best, Yvonne
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