--- /dev/null
+## Copyright (C) 2003-2011 David Legland <david.legland@grignon.inra.fr>
+## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
+## All rights reserved.
+##
+## Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are met:
+##
+## 1 Redistributions of source code must retain the above copyright notice,
+## this list of conditions and the following disclaimer.
+## 2 Redistributions in binary form must reproduce the above copyright
+## notice, this list of conditions and the following disclaimer in the
+## documentation and/or other materials provided with the distribution.
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
+## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+##
+## The views and conclusions contained in the software and documentation are
+## those of the authors and should not be interpreted as representing official
+## policies, either expressed or implied, of the copyright holders.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{polygons} = } splitPolygons (@var{polygon})
+## Convert a NaN separated polygon list to a cell array of polygons.
+##
+## @var{polygon} is a N-by-2 array of points, with possibly couples of NaN values.
+## The functions separates each component separated by NaN values, and
+## returns a cell array of polygons.
+##
+## @seealso{polygons2d}
+## @end deftypefn
+function polygons = splitPolygons(polygon)
+
+ if iscell(polygon)
+ # case of a cell array
+ polygons = polygon;
+
+ elseif sum(isnan(polygon(:)))==0
+ # single polygon -> no break
+ polygons = {polygon};
+
+ else
+ # find indices of NaN couples
+ inds = find(sum(isnan(polygon), 2)>0);
+
+ # number of polygons
+ N = length(inds)+1;
+ polygons = cell(N, 1);
+
+ # iterate over NaN-separated regions to create new polygon
+ inds = [0;inds;size(polygon, 1)+1];
+ for i=1:N
+ polygons{i} = polygon((inds(i)+1):(inds(i+1)-1), :);
+ end
+ end
+
+endfunction