% 画一个可透视的椭球
figure
a = 15;
b = 10;
c = 5;
k = 5;
n = 2^k-1;
theta = pi*(-n:2:n)/n;
phi = (pi/2)*(-n:2:n)'/n;
X = a*cos(phi)*cos(theta);
Y = b*cos(phi)*sin(theta);
Z = c*sin(phi)*ones(size(theta));
surf(X,Y,Z,'FaceColor','interp',...
'EdgeColor','none',...
'FaceLighting','phong')
axis tight
camlight left
alpha(.33) % 产生透视效果
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