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diff --git a/Master/texmf/doc/asymptote/examples/sinc.asy b/Master/texmf/doc/asymptote/examples/sinc.asy
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+import graph3;
+import contour;
+
+currentprojection=orthographic(1,-2,1);
+currentlight=(1,-1,0.5);
+
+size(12cm,0);
+
+real sinc(pair z) {
+ real r=2pi*abs(z);
+ return r != 0 ? sin(r)/r : 1;
+}
+
+draw(lift(sinc,contour(sinc,(-2,-2),(2,2),new real[] {0})),red);
+draw(surface(sinc,(-2,-2),(2,2),Spline),lightgray+opacity(0.5));
+
+xaxis3("$x$",Bounds,InTicks);
+yaxis3("$y$",Bounds,InTicks(beginlabel=false));
+zaxis3("$z$",Bounds,InTicks);