'use strict';
(function() {
  var viewer;
  var url;
  var model;

  function load() {
    var req = new XMLHttpRequest();
    var isBinary = /[.]gz$/.test(url) || /[.]zip$/.test(url);
    req.overrideMimeType('text/plain; charset=x-user-defined');
    req.open('GET', url, true);
    if (isBinary)
      req.responseType = 'arraybuffer';

    req.onreadystatechange = function(event) {
      if (req.readyState !== 4)