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on 26 Oct 2021
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nr = 3; % number of revolutions
ex = 1/2; % shaping exponent, e.g. 1/2, 1, 2
t = 0:0.01:nr;
k = (0:0.01:1)';
x = k.*t.*cos(2*pi*t);
y = k.*t.*sin(2*pi*t);
z = (k.^ex).*ones(size(t));
figure('Color','k')
surf(x,y,z)
colormap cool
shading interp
lighting gouraud
camlight headlight
axis off
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