Cesium Camera move test

HTML

<script src="https://cesiumjs.org/Cesium/Build/Cesium/Cesium.js"></script>
<link rel="stylesheet" href="https://cesiumjs.org/Cesium/Build/Cesium/Widgets/widgets.css">
<div id="cesiumContainer"></div>

CSS

html, #cesiumContainer {
          height: 100%;
      }
      body {
          padding: 0;
          margin: 0;
          overflow: hidden;
          height: 100%;
      }

JavaScript

// A demo of interactive 3D Tiles styling
// Styling language Documentation: https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/master/Styling
// Building data courtesy of NYC OpenData portal: http://www1.nyc.gov/site/doitt/initiatives/3d-building.page
var viewer = new Cesium.Viewer('cesiumContainer');

//??var xx = [-1.3194369277314022, 0.6988062530900625, -1.3193955980204217, 0.6988091578771254, -1.3193931220959367, 0.698743632490865, -1.3194358224045408, 0.6987471965556998];
var xx = [-74.02,40.71, -74.00,40.71, -74.01,40.70];

var entity = viewer.entities.add({
    polygon : {
        hierarchy : new Cesium.PolygonHierarchy(Cesium.Cartesian3.fromDegreesArray(xx)),
        material : Cesium.Color.RED.withAlpha(0.5),
        classificationType : Cesium.ClassificationType.CESIUM_3D_TILE
    }
});

// Set the initial camera view to look at Manhattan
var initialPosition = Cesium.Cartesian3.fromDegrees(-74.01881302800248, 40.69114333714821, 753);
var initialOrientation = new Cesium.HeadingPitchRoll.fromDegrees(21.27879878293835, -21.34390550872461, 0.0716951918898415);
viewer.scene.camera.setView({
    destination: initialPosition,
    orientation: initialOrientation,
    endTransform: Cesium.Matrix4.IDENTITY
});

// Load the NYC buildings tileset.
var tileset = new Cesium.Cesium3DTileset({ url: Cesium.IonResource.fromAssetId(3839) });
viewer.scene.primitives.add(tileset);

// Color buildings based on their height.
function colorByHeight() {
    tileset.style = new Cesium.Cesium3DTileStyle({
        color: {
            conditions: [
                ["${height} >= 300", "rgba(45, 0, 75, 0.5)"],
                ["${height} >= 200", "rgb(102, 71, 151)"],
                ["${height} >= 100", "rgb(170, 162, 204)"],
                ["${height} >= 50", "rgb(224, 226, 238)"],
                ["${height} >= 25", "rgb(252, 230, 200)"],
                ["${height} >= 10", "rgb(248, 176, 87)"],
                ["${height} >= 5", "rgb(198, 106, 11)"],
               ...