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diff --git a/inst/geom3d/planePosition.m b/inst/geom3d/planePosition.m
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--- a/inst/geom3d/planePosition.m
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-## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
-## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
-## 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.
-
-## -*- texinfo -*-
-## @deftypefn {Function File} {@var{pt2} =} planePosition (@var{point}, @var{plane})
-## Compute position of a point on a plane
-##
-##   PT2 = planePosition(POINT, PLANE)
-##   POINT has format [X Y Z], and plane has format
-##   [X0 Y0 Z0  DX1 DY1 DZ1  DX2 DY2 DZ2], where :
-##   - (X0, Y0, Z0) is a point belonging to the plane
-##   - (DX1, DY1, DZ1) is a first direction vector
-##   - (DX2, DY2, DZ2) is a second direction vector
-##
-##   Result PT2 has the form [XP YP], with [XP YP] coordinate of the point
-##   in the coordinate system of the plane.
-##
-##
-##   CAUTION:
-##   WORKS ONLY FOR PLANES WITH ORTHOGONAL DIRECTION VECTORS
-##
-## @seealso{planes3d, points3d, planePoint}
-## @end deftypefn
-function pos = planePosition(point, plane)
-  # unify size of data
-  if size (point, 1) ~= size (plane, 1)
-      if size (point, 1) == 1
-          point = repmat (point, [size(plane, 1) 1]);
-      elseif size (plane, 1) == 1
-          plane = repmat (plane, [size(point, 1) 1]);
-      else
-          error ('point and plane do not have the same dimension');
-      end
-  end
-
-  p0 = plane(:, 1:3);
-  d1 = plane(:, 4:6);
-  d2 = plane(:, 7:9);
-
-  s = dot (point-p0, d1, 2) ./ vectorNorm (d1);
-  t = dot (point-p0, d2, 2) ./ vectorNorm (d2);
-
-  pos = [s t];
-
-endfunction