Como definir a visibilidade de polígonos no Gmap

Utilizando o seguinte código, eu consigo exibir as marcações e escondê-las conforme o checkbox do filtro, porém ao tentar esconder os polígonos, ele não o faz. Não há erros no console.

function initialize() {
 var a = new google.maps.LatLng(-9.6457169, -36.4931743),
 b = {
 zoom: 10,
 scrollwheel: !1,
 center: a,
 mapTypeId: google.maps.MapTypeId.ROADMAP
 };
 map = new google.maps.Map(document.getElementById("mapa"), b)
}

function abrirInfoBox(a, b) {
 "string" == typeof idInfoBoxAberto && "object" == typeof infoBox[idInfoBoxAberto] && infoBox[idInfoBoxAberto].close(), console.log(infoBox[a]);
 try {
 infoBox[a].open(map, b)
 } catch (c) {}
 idInfoBoxAberto = a
}

function carregarPontos() {
 $.post("/mapa/markers", function(a) {
 var b = new google.maps.LatLngBounds;
 $.each(a, function(a, c) {
 try {
 if (c.Latitude.length > 0) {
 var d = new google.maps.Marker({
 position: new google.maps.LatLng(c.Latitude, c.Longitude),
 title: c.Titulo,
 slug: c.icone,
 icon: "../img/layout/icones/" + c.icone + ".png"
 }),
 e = {
 content: "<p>" + c.Descricao + "</p>",
 pixelOffset: new google.maps.Size(-150, 0)
 };
 infoBox[c.Id] = new InfoBox(e), infoBox[c.Id].marker = d, infoBox[c.Id].listener = google.maps.event.addListener(d, "click", function() {
 abrirInfoBox(c.Id, d)
 }), markers.push(d), b.extend(d.position)
 } else if (c.json.length > 0) {
 var f = [];
 $.each($.parseJSON(c.json), function(a, b) {
 f[a] = new google.maps.LatLng(b.lat, b.lng)
 }), overlays[a] = new google.maps.Polygon({
 paths: f,
 strokeColor: "#" + c.cor,
 strokeOpacity: .8,
 strokeWeight: 3,
 fillColor: "#" + c.cor,
 fillOpacity: .35
 }), overlays[a].setMap(map)
 }
 } catch (g) {}
 });
 new MarkerClusterer(map, markers)
 return overlays;
 }, "json");
}

function doFilter() {
 data = dataTeste;
 for (var a = $("input[type=checkbox]:checked"), b = [], c = 0, d = a.length; d > c; c++) b.push($(a[c]).val());
 $.each(markers, function(a, c) {
 var d = !1;
 return $.each(b, function(b, e) {
 if (d === !1) try {
 e == c.slug ? (d = !0, markers[a].setVisible(!0)) : markers[a].setVisible(!1)
 } catch (f) {}
 }), d === !0 ? !0 : void 0
 })
}
var map, idInfoBoxAberto, infoBox = [], markers = [], overlays = [], dataTeste = {};

initialize();
dataTeste = carregarPontos();

console.log(typeof dataTeste);

$(document).on("click", "input[type=checkbox]", doFilter);

$(".overlay").bind("click", function(abc) {
 obj = $(this),
 $.each(dataTeste, function(a, b) {
 b.icone == obj.val() && (overlays[a].setMap(obj.is(":checked") ? map : null), console.log("1"))
 })
});

Os filtros ara os polígonos possuem a classe "overlay"