如何在matlab中绘制曲面？

我试图在管道上做一个切口，我想做一个曲面来代表管道的外部。然而，当我绘制曲面时，我只得到曲面的对角线，而不是曲面本身。我怎样才能解决这个问题

MWE：

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用

surf（xx5，yy5，zz）试试
surf
。这就是你要找的吗

您创建的网格基于θ和半径。但是，管道外部的半径是恒定的，因此它应该基于θ和z，因为这是定义网格的两个独立变量。基于这个理由，我相信以下是你想要的

r = 0:0.1:3;
z = 0:0.1:10;  

% set cut planes angles
theta1 = 0;
theta2 = pi*135/180;
nt = 101;  % angle resolution

figure(1);
clf; 

% create a grid over theta and z
t3 = linspace(theta1, (theta2 - 2*pi), nt);
[tt3, zz3] = meshgrid(t3, z);
% convert from cylindical to Cartesian coordinates
xx5 = r(end) * cos(tt3);
yy5 = r(end) * sin(tt3);
% plot surface
h5 = surface(xx5, yy5, zz3, 'EdgeColor', 'none');

% extra stuff to make plot prettier
axis vis3d
axis equal
view(3)
camzoom(0.7);


r = 0:0.1:3;
z = 0:0.1:10;  

% set cut planes angles
theta1 = 0;
theta2 = pi*135/180;
nt = 101;  % angle resolution

figure(1);
clf; 

% create a grid over theta and z
t3 = linspace(theta1, (theta2 - 2*pi), nt);
[tt3, zz3] = meshgrid(t3, z);
% convert from cylindical to Cartesian coordinates
xx5 = r(end) * cos(tt3);
yy5 = r(end) * sin(tt3);
% plot surface
h5 = surface(xx5, yy5, zz3, 'EdgeColor', 'none');

% extra stuff to make plot prettier
axis vis3d
axis equal
view(3)
camzoom(0.7);