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Multi-user augmented reality can be used for communication between people. Multiple people, each with a pair of AR glasses, could all see a 3D model that one person is annotating.

Multi-user augmented reality can be used for communication between people. Multiple people, each with a pair of AR glasses, could all see a 3D model that one person is annotating.

Augmented reality can be done using a notebook computer. In this way, it does not need an [[absolute positioning system]] relative to the environment. It has an embedded coordinate system, such that there is a homotopy between the set of [[transform]]s in the real world coordinate system and the set of transforms in the embedded coordinate system of the notebook computer.

Augmented reality largely overlaps with the concept of [[3D display]]s, but also includes [[absolute positioning system]]s. One concept of augmented reality is to have a fixed 3D display in an environment.

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==Technologies==

==Technologies==