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+import solids;
+import palette;
+
+currentprojection=orthographic(20,0,3);
+
+size(400,300,IgnoreAspect);
+
+revolution r=revolution(new real(real x) {return sin(x)*exp(-x/2);},
+ 0,2pi,operator ..,Z);
+surface s=surface(r);
+
+surface S=planeproject(shift(-Z)*unitsquare3)*s;
+S.colors(palette(s.map(zpart),Rainbow()));
+draw(S);
+draw(s,lightgray);