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Curated head shape for FSAverage - #14462
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Both the coregistration GUI and plot_alignment looked for outer_skin.surf before the subject's own -head.fif, so a curated head surface (such as the fsaverage head packaged with MNE) was never used when a watershed outer skin was also present.
Both fsaverage zip files ship the watershed outer skin as bem/fsaverage-head.fif, so the smoother head surface packaged with MNE (previously only reachable through create_default_subject, which needs a FreeSurfer install) was never used. This modification copies it over the extracted file when fsaverage-head.fif was missing before the downloads; existing files are left alone, consistent with the no-overwrite rule.
christianbrodbeck
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Ugh this seems like an error on our part, thanks @christianbrodbeck ! I think it'll be cleaner to update the |
larsoner
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Oct 28, 2026
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October 28, 2026 18:22
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What does this implement/fix?
MNE-Python ships a curated head shape for FSAverage that I used to use for coregistration (left-most picture). With the
fetch_fsaveragefunction this head shape is not used anymore, and the result of watershed is used instead (middle). Was this change intentional? If not, this PR restores the old behavior by copying the curated head shape from mne-python infetch_fsaverage, and using it in the coregistration GUI.