// var viewer = new Cesium.Viewer('cesiumContainer',{
// 	vrButton:false
// });

// var wyoming = viewer.entities.add({
//   polygon : {
//     hierarchy : Cesium.Cartesian3.fromDegreesArray([
//                               -109.080842,45.002073,
//                               -105.91517,45.002073,
//                               -104.058488,44.996596,
//                               -104.053011,43.002989,
//                               -104.053011,41.003906,
//                               -105.728954,40.998429,
//                               -107.919731,41.003906,
//                               -109.04798,40.998429,
//                               -111.047063,40.998429,
//                               -111.047063,42.000709,
//                               -111.047063,44.476286,
//                               -111.05254,45.002073]),
//     height : 0,
//     material : Cesium.Color.RED.withAlpha(0.5),
//     outline : true,
//     outlineColor : Cesium.Color.BLACK
//   }
// });

// viewer.zoomTo(wyoming);

//Initialize the viewer widget with several custom options and mixins.
var viewer = new Cesium.Viewer('cesiumContainer', {
    //Start in Columbus Viewer
    // sceneMode : Cesium.SceneMode.COLUMBUS_VIEW,
    //Use Cesium World Terrain
    terrainProvider : Cesium.createWorldTerrain(),
    //Hide the base layer picker
    baseLayerPicker : false,
    //Use OpenStreetMaps
    imageryProvider : new Cesium.OpenStreetMapImageryProvider({
        url : 'https://a.tile.openstreetmap.org/'
    }),
    skyBox : new Cesium.SkyBox({
        sources : {
          positiveX : 'stars/TychoSkymapII.t3_08192x04096_80_px.jpg',
          negativeX : 'stars/TychoSkymapII.t3_08192x04096_80_mx.jpg',
          positiveY : 'stars/TychoSkymapII.t3_08192x04096_80_py.jpg',
          negativeY : 'stars/TychoSkymapII.t3_08192x04096_80_my.jpg',
          positiveZ : 'stars/TychoSkymapII.t3_08192x04096_80_pz.jpg',
          negativeZ : 'stars/TychoSkymapII.t3_08192x04096_80_mz.jpg'
        }
    }),
    // Show Columbus View map with Web Mercator projection
    mapProjection : new Cesium.WebMercatorProjection()
});

//Add basic drag and drop functionality
viewer.extend(Cesium.viewerDragDropMixin);

//Show a pop-up alert if we encounter an error when processing a dropped file
viewer.dropError.addEventListener(function(dropHandler, name, error) {
    console.log(error);
    window.alert(error);
});