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+import graph3;
+import palette;
+import contour3;
+size(400);
+
+real f(real x, real y, real z) {
+ return cos(x)*sin(y)+cos(y)*sin(z)+cos(z)*sin(x);
+}
+
+surface sf=surface(contour3(f,(-2pi,-2pi,-2pi),(2pi,2pi,2pi),12));
+sf.colors(palette(sf.map(abs),Gradient(red,yellow)));
+draw(sf,nolight);