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on 7 Oct 2022
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[X,Y,Z] = tubeN(@(t) t/3, 30, @(t)[ t.*sin(t), t.*cos(t), 20-t],[0,20],120);
s = surf(X,Y,Z, FaceColor = 'r', EdgeAlpha = 0.3); hold on;
[X,Y,Z] = tubeN(@(t) 5*sin(t),20,@(t)[ 5*t, 0*t, 20+0*t],[-4,4],40);
s = surf(X,Y,Z, FaceCOlor = 'r', EdgeAlpha = 0.3);
axis equal; camlight;
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