/usr/share/octave/packages/nurbs-1.3.7/nrbtestsrf.m is in octave-nurbs 1.3.7-1build1.
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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 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | function srf = nrbtestsrf
% NRBTESTSRF: Constructs a simple test surface.
%
% Copyright (C) 2000 Mark Spink
%
% 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/>.
% allocate multi-dimensional array of control points
pnts = zeros(3,5,5);
% define a grid of control points
% in this case a regular grid of u,v points
% pnts(3,u,v)
%
pnts(:,:,1) = [ 0.0 3.0 5.0 8.0 10.0; % w*x
0.0 0.0 0.0 0.0 0.0; % w*y
2.0 2.0 7.0 7.0 8.0]; % w*z
pnts(:,:,2) = [ 0.0 3.0 5.0 8.0 10.0;
3.0 3.0 3.0 3.0 3.0;
0.0 0.0 5.0 5.0 7.0];
pnts(:,:,3) = [ 0.0 3.0 5.0 8.0 10.0;
5.0 5.0 5.0 5.0 5.0;
0.0 0.0 5.0 5.0 7.0];
pnts(:,:,4) = [ 0.0 3.0 5.0 8.0 10.0;
8.0 8.0 8.0 8.0 8.0;
5.0 5.0 8.0 8.0 10.0];
pnts(:,:,5) = [ 0.0 3.0 5.0 8.0 10.0;
10.0 10.0 10.0 10.0 10.0;
5.0 5.0 8.0 8.0 10.0];
% knots
knots{1} = [0 0 0 1/3 2/3 1 1 1]; % knots along u
knots{2} = [0 0 0 1/3 2/3 1 1 1]; % knots along v
% make and draw nurbs surface
srf = nrbmak(pnts,knots);
end
%!demo
%! srf = nrbtestsrf;
%! nrbplot(srf,[20 30])
%! title('Test surface')
%! hold off
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