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 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.