//Dataset samples: 
var building1_extent_points = new Cesium.Cartesian3.fromDegreesArrayHeights([29.1456,41.1213,264.49,29.1437,41.1213,365.11]);
var building2_extent_points = new Cesium.Cartesian3.fromDegreesArrayHeights([28.9011,40.9872,51.25,28.9016,40.9875,86.45]);
var building3_extent_points = new Cesium.Cartesian3.fromDegreesArrayHeights([29.0146,41.1162,81.31,29.0053,41.1186,290.29]);

// Grant CesiumJS access to your ion assets
Cesium.Ion.defaultAccessToken = "XXX";

try {
  const viewer = new Cesium.Viewer("cesiumContainer", {
    terrainProvider:
      await Cesium.CesiumTerrainProvider.fromIonAssetId(1),
  });

//This object is unnecessary.
//It is only used to visualize the boundingsphere object with a approximate size.
  const outlineOnly = viewer.entities.add({
    name: "Yellow ellipsoid outline",
    position: Cesium.Cartesian3.fromDegrees(29.14465, 41.1213, 314.8),
    ellipsoid: {
      radii: new Cesium.Cartesian3(64, 64, 64),
      fill: false,
      outline: true,
      outlineColor: Cesium.Color.YELLOW,
      slicePartitions: 24,
      stackPartitions: 36,
    },
  });

  const kure = Cesium.BoundingSphere.fromCornerPoints
    (building1_extent_points[0], building1_extent_points[1]);
  //console.dir(kure);

  viewer.scene.camera.flyToBoundingSphere(kure, 
       {duration: 6.0, 
        offset : new Cesium.HeadingPitchRange
            (0.0, Cesium.Math.toRadians(-30),(kure.radius)*3 )});
} catch (error) {
  console.log(error);