A bi-directional maintenance content development tool has
been developed for AR developers and maintenance technicians to
develop context-aware AR contents. The bi-directional process
(Fig. 2) consists of two main steps, namely, context modeling and
information instance modeling. Intuitive user interfaces are
provided, where a desktop user interface consisting of an authoring
panel and the augmented virtual scene is provided in OFA (Fig.
3(a)), and a mobile user interface, consisting of a physical marker
and a virtual panel [9] is provided in OSA. The physical marker is
tracked in 3D space and acts as a 2D cursor and/or 3D placement
tool. The virtual panel is a virtual display of computer augmented
information, e.g., virtual buttons. The user can place the 2D cursor
on a virtual button for a predefined time range to activate it (Fig.
3(b)). The user can use the 3D placement tool to arrange the virtual
objects spatially (Fig. 3(c)).