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import graph3;
import contour;
currentprojection=orthographic(1,-2,1);
currentlight=White;
size(12cm,0);
real sinc(pair z) {
real r=2pi*abs(z);
return r != 0 ? sin(r)/r : 1;
}
render render=render(compression=Low,merge=true);
draw(lift(sinc,contour(sinc,(-2,-2),(2,2),new real[] {0})),red);
draw(surface(sinc,(-2,-2),(2,2),Spline),lightgray,render);
draw(scale3(2*sqrt(2))*unitdisk,paleyellow+opacity(0.25),nolight,render);
draw(scale3(2*sqrt(2))*unitcircle3,red,render);
xaxis3("$x$",Bounds,InTicks);
yaxis3("$y$",Bounds,InTicks(beginlabel=false));
zaxis3("$z$",Bounds,InTicks);
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