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MMO Features

  • Region-based interest management

  • Items (Avatars, NPCs, shared game objects)

    • Clients can spawn, destroy and move items.
    • Items can have properties that are readable by other clients and changeable by the owner.
    • Item properties have a revision number: Clients that lose sight of an item for some time can compare the revision to determine if they need to receive updated properties.
  • Interest automatically received.

    • Interest areas have two interest thresholds. Items that enter the inner radius become visible; items that leave the outer become invisible. This optimization reduces frequent visibility changes.

Photon Server: MMO Interest Areas

  • Invisible item, out of range

    • Invisible item enters outer interest area
    • Invisible item enters inner interest area and becomes visible
    • Visible item leaves inner interest area
    • Visible item leaves outer interest area and becomes invisible
  • Interest areas can be resized: Adjusting the view distance in proportion to the amount of seen items can be beneficial

    • To improve the performance in crowded areas or
    • To show distant items in areas with low population.
  • Interest areas can be attached to any item: Whenever the item moves the interest area follows and changes the interest accordingly. This is especially useful to move the interest area with the own avatar.

  • Detached interest areas can be moved freely. This is beneficial for camera flights.
  • Clients can have multiple interest areas to show different parts of the world at the same time.

  • Manual interest management: Clients can manually (un-)declare interest in items.

  • Custom events can be sent through items to two possible targets:

    • The item owner
    • All clients that are interested in the item (item subscriber)
  • Optimized position updates: Clients send updates only when they move.

  • Duplicate user recognition: A subsequent user connection resets the previous connection.

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