[Mne_analysis] BEM mesh error while downsampling vertices

[Eric Larson]

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>
> I was able to locate the vertices using the "rr" matrix. I dissolved those
> error-giving vertices in Blender.
>
> But while running the "make_bem_model" function, I got a runtime
> error message that:
> "Surface inner skull is not complete (sum of solid angles yielded
> 0.999622, should be 1.)"
>

My guess is that there is a hole / are some holes in the mesh. We could
probably add some checks for this in our code. In the meantime can you see
if there is a hole / are some holes?

https://blender.stackexchange.com/questions/20956/is-there-a-way-to-check-a-mesh-for-problems

If there are (or if Blender says there are other problems), consider
looking at:

https://docs.blender.org/manual/en/2.80/modeling/meshes/editing/cleanup.html#fill-holes

And again any insights you gain from this process would make for a great
documentation enhancement / pull request!

Eric
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