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ameircan donut
on 25 Oct 2021
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[l,L]=meshgrid(linspace(-1,1,4000));
t=l*pi;
f=L*pi;
x=(2+cos(t)).*cos(f);
y=(2+cos(t)).*sin(f);
z=sin(t);
surf(x,y,z,z+5*(z-0.4>cos(6*f).*cos(t/2)/3));
colormap([pink; pink]);
shading interp;
axis equal off;
set(gcf,'color',[0.8 0.8 1]);
view([0 40])