finddisconnsurf.m

function facecell = finddisconnsurf(f)
%
% facecell=finddisconnsurf(f)
%
% subroutine to extract disconnected surfaces from a
% cluster of surfaces
%
% author: Qianqian Fang (q.fang at neu.edu)
% Date: 2008/03/06
%
% input:
%     f: faces defined by node indices for all surface triangles
%
% output:
%     facecell: separated disconnected surface node indices
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%

facecell = {};
subset = [];
while (~isempty(f))
    idx = reshape(ismember(f, f(1, :)), size(f));
    ii = find(sum(idx, 2));
    while (~isempty(ii))
        if (isempty(ii))
            break
        end
        % ii=unique(ii);
        subset(end + 1:end + length(ii), :) = f(ii, :);
        f(ii, :) = [];
        idx = reshape(ismember(f, subset), size(f));
        ii = find(sum(idx, 2));
    end
    if (~isempty(subset))
        facecell{end + 1} = subset;
        subset = [];
    end
end