[Freesurfer] Choice of input surface for mris_make_face_parcellation

Hi Bruce,

I'm playing around with mris_make_face_parcellation, and I'm looking for guidance on choosing the "input surface".

In the usage message, the example that is given says:

"example: mris_make_face_parcellation lh.inflated $FREESURFER_HOME/lib/bem/ic3.tri ./lh.ic3.annot"

The choice of the inflated surface seems weird to me, as isn't it really just used for visualization? Seems like you'd either want to use a surface that's representative of the actual brain geometry (e.g. white, or "graymid") or the sphere. But I'm a little confused in general about what's going on behind the scenes here so I don't trust my intuition.

Cheers, Michael