hmmm, looks like it is a bug in the icosahedral supertesselation
algorithm we use as it's in the icosahedron too:
mris_info --v 0 $FREESURFER_HOME/lib/bem/ic7.tri
v 0: (0.0, 0.0, 1.0), 5 nbrs
0: v 40964, dist 0.0
1: v 40962, dist 0.0
2: v 40965, dist 0.0
3: v 40967, dist 0.0
4: v 40969, dist 0.0
mris_info --v 40969 $FREESURFER_HOME/lib/bem/ic7.tri
v 40969: (0.0, 0.0, 1.0), 6 nbrs
0: v 0, dist 0.0
1: v 40967, dist 0.0
2: v 40964, dist 0.0
3: v 40970, dist 0.0
4: v 10249, dist 0.0
5: v 40971, dist 0.0
is it causing any problems? Fixing it is not trivial....
Bruce
On
Wed, 8 Apr 2015,
John
Kochalka wrote:
> Dear FS experts,
>
> I recently found that vertices 1 and 40970 (1-based indexing) are duplicates
> in the fsaverage lh pial and white meshes. In Matlab:
>
>>> FH = getenv('FREESURFER_HOME');
>>> addpath(fullfile(FH,'matlab'));
>>> [xyz, faces] = read_surf(fullfile(FH,'subjects/fsaverage/surf/lh.pial'));
>>> xyz(1,:)
>
> ans =
>
> -38.8345 -19.0194 66.9084
>
>>> xyz(40970,:)
>
> ans =
>
> -38.8345 -19.0194 66.9084
>
> This apparently came up previously here
> (https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2014-April/037447.html)
> but didn't get much traction. The mesh in that region looks a pretty bad
> (see attached), so I'd just like to get a solid answer on whether this is a
> bug or problematic in any way. Thanks.
>
>
> Best,
> John
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