Hi Michael,

I think this is a problem that crops up periodically for us in the
MEEG world, where we use these downsampling
as calculated in MNE. If my memory serves, as you go to higher
resolutions you end up with multiple points
being mapped to the same location, which I don't believe we have ever
found a solution to. Note, this can even happen
at ico 5 (particularly on smaller brains).


hth
d

On Fri, Mar 25, 2016 at 2:20 PM, Michael Waskom <mwaskom@stanford.edu> wrote:
> Hi Freesurfers,
>
> I'd like to use mris_make_face_parcellation to downsample an individual
> subject's surface mesh to a resolution similar to fsaverage6.
>
> My understanding is that mris_make_face_parcellation should let me do this,
> and it does what I expect with ic3-5. However when I run it with ic6 as the
> target, it fails:
>
> [surf]$ mris_make_face_parcellation lh.sphere
> $FREESURFER_HOME/lib/bem/ic6.tri ../label/lh.ico6.annot
> Reading lh.sphere
> Reading /share/awagner/software/freesurfer/v5.3.0/lib/bem/ic6.tri
> parcellating hemisphere into 40962 units
> INFO: CTABunique() could not find a unique set in 10 tries
> INFO: CTABunique() could not find a unique set in 100 tries
> ERROR: could not find a unique color table
>
> I don't really care if the colors themselves are distinct, and it should be
> possible to just programmatically generate a valid color table (since 255 ^
> 3 > 40962). I thought that providing a colortable with unique values through
> the -ctab option might work, but looking at the source code it seems that
> option will *write* a colortable, not read one.
>
> So, is there any way to accomplish the downsampling I want?
>
> Thanks in advance,
> Michael
>

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