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+// Riemann surface of z^{1/n}
+import graph3;
+import palette;
+
+int n=3;
+
+size(200,300,keepAspect=false);
+//settings.nothin=true;
+
+currentprojection=orthographic(10,10,30);
+currentlight=(10,10,5);
+triple f(pair t) {return (t.x*cos(t.y),t.x*sin(t.y),t.x^(1/n)*sin(t.y/n));}
+
+surface s=surface(f,(0,0),(1,2pi*n),30,60);
+s.colors(palette(s.map(zpart),Rainbow()));
+
+draw(s,meshpen=black);