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on 22 Oct 2021
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p=pi;
b=[3:5;2.8:4.8;4:6;1.05:.25:1.55];
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','m',EdgeAlpha=.08)
hold on
view([13 11])
end
axis off
lightangle(gca,-45,25)
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