demohelix.m

强大的nurbs的工具箱 nurbs曲线

function demohelix
% Demonstration of a 3D helical curve
%

% D.M. Spink
% Copyright (c) 2000

coefs =[ 6.0  0.0  6.0  1;
        -5.5  0.5  5.5  1;
        -5.0  1.0 -5.0  1;
         4.5  1.5 -4.5  1;
         4.0  2.0  4.0  1;
        -3.5  2.5  3.5  1;
        -3.0  3.0 -3.0  1;
         2.5  3.5 -2.5  1;
         2.0  4.0  2.0  1;
        -1.5  4.5  1.5  1;
        -1.0  5.0 -1.0  1;
         0.5  5.5 -0.5  1;
         0.0  6.0  0.0  1]';
knots = [0 0 0 0 .1 .2 .3 .4 .5 .6 .7 .8 .9 1 1 1 1];

crv = nrbmak(coefs,knots);
nrbplot(crv,100);
title('3D helical curve.');
grid on;