Mne-python: stc.plot with pyvista: error with hemi='both'

[SophieHerbst]

I am not able to plot the two hemispheres of an stc at the same time with time_viewer=True , for instance when using this example:

stc.plot(hemi='both', subjects_dir=subjects_dir, initial_time=0.07,
          size=(800, 600),time_viewer=True)

Error:

File "/home/sh254795/pyvista/pyvista/plotting/plotting.py", line 2215, in subplot
raise IndexError('Column index is out of range ({})'.format(self.shape[1]))

IndexError: Column index is out of range (1)

With hemi='split' the panels overlap, and the time-slider is not usable (I can send a screenshot).
Also, from the documentation it is not clear to me what the difference between 'both' and 'split' would do.

[GuillaumeFavelier]

Could you share a screenshot? It would help me understand the situation.

A fix for the slider position in hemi=split is in https://github.com/mne-tools/mne-python/pull/7227/commits/5d78f05ef95c858edb20a7851572cc92719eb1fa. The PR is still waiting for reviews but hopefully soon to be merged.

Also I can reproduce the issue with hemi=both so I'll work on a fix soon :+1:

Also, from the documentation it is not clear to me what the difference between 'both' and 'split' would do.

From the doc of _Brain:

    hemi : str
        Hemisphere id (ie 'lh', 'rh', 'both', or 'split'). In the case
        of 'both', both hemispheres are shown in the same window.
        In the case of 'split' hemispheres are displayed side-by-side
        in different viewing panes.

The hemispheres are in the same view with both and are in different views with split. Feel free to share suggestions about how we can improve the documentation.

[GuillaumeFavelier]

Here is an example:

Split | Both
------|------
|

[SophieHerbst]

Here is a screenshot, using the split option with time_viewer.

[SophieHerbst]

About the doc: the one from _Brain is totally fine, it just needs to be copied to the one of stc.plot, which currently says:

hemi : str, ‘lh’ | ‘rh’ | ‘split’ | ‘both’

The hemisphere to display.