readasc.m

function [node, elem] = readasc(fname)
%
% [node,elem]=readasc(fname)
%
% read FreeSurfer ASC mesh format
%
% author: Qianqian Fang <q.fang at neu.edu>
% date: 2009/04/02
%
% input:
%      fname: name of the asc file
%
% output:
%      node: node positions of the mesh
%      elem: element list of the mesh
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%

node = [];
elem = [];
fid = fopen(fname, 'rb');
if (fid == -1)
    error(['can not read file ' fname]);
end

line = fgetl(fid); % the first line is #!ascii ....
dim = fscanf(fid, '%d', 2);
node = fscanf(fid, '%f', [4, dim(1)])';
elem = fscanf(fid, '%f', inf);
fclose(fid);

if (length(elem) == 4 * dim(2))
    elem = reshape(elem, [4, dim(2)])';
elseif (length(elem) == 8 * dim(2))
    elem = reshape(elem, [8, dim(2)])';
end

if (~any(node(:, end)))
    node = node(:, 1:end - 1);
end
if (~any(elem(:, end)))
    elem = elem(:, 1:end - 1);
end

elem = elem + 1;