A tour is an assembly of connected room that are navigable by the end user. The tour may also contain labels which display information in 3D space about specific features of the location. Finally, the tour can have a title, a location and a logo.
Rooms are placed in 3D space and connected together. Each room will also have their panorama location displayed, either as pano bubbles or as blue discs on the floor. Those locators are used to navigate between vantage points.
Labels are placed in 3D space to annotate features of the tour.