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Events Categories in AR Applications

Session Events

  • on:start: immediately after start of AR session or after loading action
  • on:locating: on locating in the world (by GPS, by SLAM device positioning)
  • on:stable: when spatial registration of AR device gets stable
  • on:load: after loading 3D item to AR view, e.g., to animate or occlude node
  • on:stop: before AR session ends

Invocation Events

  • on:command: on command initiation
  • on:call: on function call

User Events

  • on:tap: when tapped on item
  • on:press: when long-pressed on item
  • on:drag: when dragging an item
  • on:select: when selected from options of pop-up menu
  • on:dialog: when selected from options of pop-up dialog panel
  • on:poi: when selected a point of interest in a map or minimap

Temporal Events

  • in:time: when elapsed time in seconds is reached
  • as:always: several times per seconds
  • as:repeated: like as:always, but only triggered each seconds

Data-driven Events

By using a state machine, both value changes and state transitions can generate data-driven events, taking into account previous values. This dynamic triggering turns ECA to active rules.

  • on:change: on each change of data value
  • as:stated: like as:always, but action only is triggered once when if-condition result is altered from false to true
  • as:steady: like as:stated, but action only is triggered when condition result stays true for a certain time in seconds.
  • as:activated: like as:always, but action always is triggered when if-condition result becomes true
  • as:altered: like as:always, but action always is triggered when if-condition result is altered from false to true or from true to false

Response Events

  • on:response: on receiving response from request
  • on:error: on error of handling request

Detection Events

The behavior of an AR application is primarily controlled by installing the necessary detectors to receive the corresponding detection events.

Specialized Detector Types

Detector Type Description
Location Detector Tracks world location and device pose in environment.
Feature Detector classifies feature as video stream label.
Segment Detector tracks feature as image segment in video stream.
Plane Detector detects plane in 3D space.
Image Detector recognizes and tracks image or marker in 3D space.
Text Detector detects text matched by regular expression in video or 3D.
Code Detector detects QR/barcode matched by regex in video or 3D.
Object Detector detects object by shape in image or 3D.
Face Detector tracks facial parts of humans in video or 3D.
Hand Detector tracks hand, fingers, and gestures in 3D.
Body Detector tracks body parts and joints of humans in video or 3D.
Speech Detector recognizes voice commands.
Transmitter Detector locates signal and position of wireless sender.
  • on:detect: on detecting occurrence of depicted type
  • on:track: on tracked changes in occurrence of depicted type

Notification Events

  • on:voice: on voice command from speech recognition system
  • on:enter: on enter of participant in collaboration session
  • on:message: on message from participant in collaboration session
  • on:leave: on leave of participant in collaboration session