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20070706 - 510 Players on Screen at 128 Kbps

+
+ + +Here is the paper napkin model which started the idea behind the network logic for Atom, +a massively multi-player online game with first person shooter interactivity. +
+
+
  1. Mixed P2P and server centric model.
    2. +
  2. Maximum of 256 minimum sized UDP packets/sec.
    3. +
  3. Goal to get as many players interacting at one time as possible.
+
+Key concepts. +
+
+
  1. Only send what players are looking or interacting with.
    2. +
  2. Closer players need to interact at higher frame rates.
    3. +
  3. Distant players need not interact at high frame rates.
    4. +
  4. Probably don't want to draw over 1000 players at one time.
    5. +
  5. Don't need more than 16fps of position updates for any player.
    6. +
  6. Players out of view need to be updated less frequently.
    7. +
  7. Players not being targeted need to be updated less frequently.
    8. +
  8. Player movement will be predicted and corrected when actual position is transmitted in a fluid way.
+
+Using the idea that players are sending packets directly to other peers to notify the peers of player movement and action, +here is one possible fixed distribution of 256 packets to support 510 players on screen at a given time, +
+
+
  1. 32 packets -- for 2 players -- gives 16 updates per second (targeting)
    2. +
  2. 32 packets -- for 4 players -- gives 8 updates per second (close)
    3. +
  3. 32 packets -- for 8 players -- gives 4 updates per second (near)
    4. +
  4. 32 packets -- for 16 players -- gives 2 updates per second
    5. +
  5. 32 packets -- for 32 players -- gives 1 updates per second
    6. +
  6. 32 packets -- for 64 players -- gives 0.5 updates per second
    7. +
  7. 32 packets -- for 128 players -- gives 0.25 updates per second (far)
    8. +
  8. 32 packets -- for 256 players -- gives 0.125 updates per second (distant)
+
+Now actual breakdown of packets would have to change dynamically in the game, but this shows that interacting with 510 players is possible. +Having another 10,000 to 60,000 players that are in very distant areas of the world and switching them in and out of the local pool of around 510 interactive players, + would be an easy way to support a massively online game with first person shooter interactivity. + + + +
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