/usr/share/octave/packages/vrml-1.0.13/vrml_flatten.m is in octave-vrml 1.0.13-2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | ## Copyright (C) 2002 Etienne Grossmann <etienne@egdn.net>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free Software
## Foundation; either version 3 of the License, or (at your option) any later
## version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
## details.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.
## s = vrml_flatten (x [, d, w, col]) - A planar surface containing x
##
## If the points x are not coplanar (or not in the affine plane {y|d'*y==w}),
## the surface will not contain the points, but rather their projections on
## the plane {y|d'*y==w}.
##
## x : 3 x P : 3D points
## d : 3 : normal to plane | Default : given by best_dir()
## w : 1 : intercept of plane |
## col : 3 : RGB color Default : [0.3,0.4,0.9]
##
## s : string : vrml code representing the planar surface
function s = vrml_flatten (x, d, w, col)
if nargin <= 3 || isnan (col), col = [0.3,0.4,0.9]; end
if nargin <= 1 || isnan (d), [d,w] = best_dir (x);
elseif nargin <= 2 || isnan (w), w = mean (d'*x); end
if ! nargin, error ("vrml_flatten : no arguments given"); end
y = bound_convex (d,w,x);
Q = columns (y);
faces = [ones(1,Q-2); 2:Q-1; 3:Q];
s = vrml_faces (y, faces, "col",col);
endfunction
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