nrbtestsrf.m

非均匀有理B样条的matlab程序

function srf = nrbtestsrf
% Constructs a simple test surface.

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

% 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);