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on 19 Oct 2021
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p = pi;
b = [3:5;2.8:4.8;9:11;1:.3:1.6];
for a = b
[u,v]=meshgrid(0:.01:2*p/a(4),-p/a(4):.01:p/a(4));
c = cos(u);
d = cos(v);
e = sin(u);
n = (a(1)+a(2)*d);
surf(c.*n,e.*n,-5*log(1-0.3157*v)+a(3)*sin(v)+2*d,'FaceColor','r',EdgeAlpha=.05)
hold on
view([25 5])
end
axis off
lightangle(gca,10,30)
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