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The same problem of Alcumus is posted twice by Gamebot. They even have different links:
First Link
Second Link
First Link
Second Link
Plan ahead for the next school year. Schedule your class today!
/* KH-RiemannSurface-2024-10-25.asy https://asymptote.sourceforge.io/gallery/3Dgraphs/ https://asymptote.sourceforge.io/gallery/3Dgraphs/RiemannSurface.asy https://tinyurl.com/asyweb http://asymptote.ualberta.ca/ modified: KH-2024-10-25 */ import graph3; import palette; int n=2;// modified: KH-2024-10-25 size(200,300,keepAspect=false); //settings.nothin=true; currentprojection=orthographic(dir(70,60)); currentlight=(10,10,5); triple f(pair t) {return (exp(t.x)*cos(t.y),exp(t.x)*sin(t.y),t.y);} surface s=surface(f,(-4,-2pi*n),(0,4pi),8,16,Spline);// modified: KH-2024-10-25 s.colors(palette(s.map(zpart),Rainbow())); draw(s,render(merge=true));
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