Hi,
Can you say a bit more about what you mean?
If my memory serves, as you go to higher resolutions you end up with
multiple points being mapped to the same location,
Do you mean multiple icosahedron vertices being mapped to the same native mesh vertex, or the other way around?
In any case, the issue here is a little bit different, in that it is just raised when trying to generate a color table for the annotation: https://github.com/neurodebian/freesurfer/blob/master/utils/colortab.c#L540
Michael
On Fri, Mar 25, 2016 at 11:27 AM, dgw dgwakeman@gmail.com wrote:
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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