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diff --git a/octave_packages/nurbs-1.3.6/nrbtestsrf.m b/octave_packages/nurbs-1.3.6/nrbtestsrf.m
new file mode 100644
index 0000000..71a97db
--- /dev/null
+++ b/octave_packages/nurbs-1.3.6/nrbtestsrf.m
@@ -0,0 +1,61 @@
+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 2 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
+