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+%% Copyright (c) 2011, INRA
+%% 2005-2011, David Legland <david.legland@grignon.inra.fr>
+%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
+%%
+%% All rights reserved.
+%% (simplified BSD License)
+%%
+%% 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 COPYRIGHT HOLDER 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 copyright holder.
+
+%% -*- texinfo -*-
+%% @deftypefn {Function File} {@var{pts} = } triangleGrid (@var{bounds}, @var{origin}, @var{size})
+%% Generate triangular grid of points in the plane.
+%%
+%%   usage
+%%   PTS = triangleGrid(BOUNDS, ORIGIN, SIZE)
+%%   generate points, lying in the window defined by BOUNDS, given in form
+%%   [xmin ymin xmax ymax], starting from origin with a constant step equal
+%%   to size. 
+%%   SIZE is constant and is equals to the length of the sides of each
+%%   triangles. 
+%%
+%%   TODO: add possibility to use rotated grid
+%%
+%% @end deftypefn
+
+function varargout = triangleGrid(bounds, origin, size, varargin)
+
+  dx = size(1);
+  dy = size(1)*sqrt(3);
+
+  % consider two square grids with different centers
+  pts1 = squareGrid(bounds, origin, [dx dy], varargin{:});
+  pts2 = squareGrid(bounds, origin + [dx dy]/2, [dx dy], varargin{:});
+
+  % gather points
+  pts = [pts1;pts2];
+
+
+  % process output
+  if nargout>0
+      varargout{1} = pts;
+  end
+
+endfunction
+