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The AOI system we inherited from Mirror is poorly designed. It's API requires O(n^2) algorithms, it is highly complex, and it is not flexible enough. This PR implements AOI in a completely different way. The NetworkIdentity objects no longer track visibility, and neither do NetworkPlayer. When the server spawns an object, all it does it raise the Spawned event, the AOI system will subscribe to this event, and then show that object to all the relevant players. Likewise, when a player joins, the AOI will listen for the event and show the relevant objects to the newly created player. In this fashion, we decouple AOI policy from NetworkIdentity and NetworkPlayers. The AOI system can keep the relationship between them in any way that is suitable. In this PR, I implement the simplest InterestManager called GlobalInterestManager. This Interest Manager will just show all objects to all players. Implement the class InterestManager to create any policy desired. I expect to create a Spatial Hashing interest Manager BREAKING CHANGE: Removed NetworkVisibility, extend InterestManager and attach to the ServerObjectManager instead.
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