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function this = read_freesurfer_file(filename)
% Low level reader of FreeSurfer files (ASCII triangle surface file)
% FORMAT this = read_freesurfer_file(filename)
% filename - FreeSurfer file
%
% See http://wideman-one.com/gw/brain/fs/surfacefileformats.htm
%__________________________________________________________________________
% Copyright (C) 2013 Wellcome Trust Centre for Neuroimaging
% Guillaume Flandin
% $Id: read_freesurfer_file.m 5322 2013-03-13 15:04:14Z guillaume $
fid = fopen(filename,'rt');
if fid == -1, error('Cannot open "%s".',filename); end
fgetl(fid); % #!ascii
N = fscanf(fid,'%d',2);
this.vertices = fscanf(fid,'%f %f %f %d',[4 N(1)])';
this.faces = fscanf(fid,'%d %d %d %d',[4 N(2)])';
fclose(fid);
this.vertices = this.vertices(:,1:3);
this.faces = this.faces(:,1:3) + 1;
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