A utility object for tracking an entity with the camera.
    
| Name | Type | Default | Description | 
|---|---|---|---|
| entity | Entity | The entity to track with the camera. | |
| scene | Scene | The scene to use. | |
| ellipsoid | Ellipsoid | Ellipsoid.WGS84 | optional The ellipsoid to use for orienting the camera. | 
Members
static Cesium.EntityView.defaultOffset3D : Cartesian3
    Gets or sets a camera offset that will be used to
initialize subsequent EntityViews.
boundingSphere : BoundingSphere
    The bounding sphere of the object.
ellipsoid : Ellipsoid
    The ellipsoid to use for orienting the camera.
    The entity to track with the camera.
    The scene in which to track the object.
Methods
    Should be called each animation frame to update the camera
to the latest settings.
    
| Name | Type | Description | 
|---|---|---|
| time | JulianDate | The current animation time. | 
| boundingSphere | BoundingSphere | optional bounding sphere of the object. | 
