democoons.m

非均匀有理B样条的matlab程序

% Construction of a bilinearly blended Coons surface
%

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

% Boundary curve 1
pnts = [ 0.0  3.0  4.5  6.5 8.0 10.0;
         0.0  0.0  0.0  0.0 0.0  0.0; 
         2.0  2.0  7.0  4.0 7.0  9.0];   
crv1 = nrbmak(pnts, [0 0 0 1/3 0.5 2/3 1 1 1]);

% Boundary curve 2
pnts= [ 0.0  3.0  5.0  8.0 10.0;
        10.0 10.0 10.0 10.0 10.0;
        3.0  5.0  8.0  6.0 10.0];
crv2 = nrbmak(pnts, [0 0 0 1/3 2/3 1 1 1]);

% Boundary curve 3
pnts= [ 0.0 0.0 0.0 0.0;
        0.0 3.0 8.0 10.0;
        2.0 0.0 5.0 3.0];
crv3 = nrbmak(pnts, [0 0 0 0.5 1 1 1]);

% Boundary curve 4
pnts= [ 10.0 10.0 10.0 10.0 10.0;
        0.0   3.0  5.0  8.0 10.0;
        9.0   7.0  7.0 10.0 10.0];
crv4 = nrbmak(pnts, [0 0 0 0.25 0.75 1 1 1]);

srf = nrbcoons(crv1, crv2, crv3, crv4);

% Draw the surface
nrbplot(srf,[20 20]);
title('Construction of a bilinearly blended Coons surface.');