import graph3;
import palette;
size(200);
currentprojection=orthographic(4,2,4);
currentlight=Viewport;
real r(real theta, real phi) {return 1+0.5*(sin(2*theta)*sin(2*phi))^2;}
triple f(pair z) {return r(z.x,z.y)*expi(z.x,z.y);}
surface s=surface(f,(0,0),(pi,2pi),50,Spline);
s.colors(palette(s.map(abs),Gradient(yellow,red)));
draw(s,render(compression=Low,merge=true));
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