I have rewritten the algorithms for calculating the visibility of panoramas while changing floors.

The SDK now provides the associated floor for each pano (aka ‘sweep’), however, simply using this data would prevent the appearance of nearby panorama hotspots that would enable a visitor to click a nearby panorama that is set to the next floor.

Therefore I have also included all nearby neighbors with a threshold of 2 meters.  Nearby neighbors on assigned to different floors appear as slightly smaller blue hotspots.