Same as ViewSceneObserver, but ignores Regions that are not tagged with one
of the tags declared in a mapping from tags to target VirtualSpaces.
ObjectDescriptions in Regions tagged with one of the tags declared in this
SceneObserver get instantiated in the VirtualSpace mapped to the tag,
as declared in the SceneObserver's constructor.
Tells the SceneManager whether a given region is of interest to this particular SceneObserver.
If it is, the SceneObserver crossing this region will trigger the loading of the ObjectDescriptions it contains.
If it is not, the Region will be ignored.
The default behaviour is to return true. Application-specific subclasses of SceneObserver can override this method
to return true/false based, e.g., on the tags declared for the region.