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on 21 Oct 2021
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%%%%%%%%%%%%%% An example of a non-orientable surface %%%%%%%%%%%%%%%%%%%%
[u,v]=ndgrid(linspace(0,2*pi));
C=@cos;
S=@sin;
l=C(u);
m=C(v);
n=S(u);
o=S(v);
%d=2/15;
d=.13;
surf(-d*l.*(3*m-30*n+90*l.^4.*n-60*l.^6.*n+5*l.*m.*n),-d*n.*(3*m-3*l.^2.*m-48*l.^4.*m+48*l.^6.*m-60*n+5*l.*m.*n-5*l.^3.*m.*n-80*l.^5.*m.*n+80*l.^7.*m.*n),d*(3+5*l.*n).*o,'FaceA',.8,'EdgeC','none')
axis off
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