Netcode for GameObjects' high level components, the RPC system and the Object Spawning System, rely on two concepts:
For an object to be replicated across the network, it needs to have a
Each object which uses components networking functionality, like
RPCs, needs a
NetworkObject component on the same
GameObject or in a parent.
NetworkObject is considered "Spawned", it is replicated across the network so that everyone has their own version of the object. Each
NetworkObject gets assigned a
NetworkId at runtime, which is used to associate two
NetworkObjects across the network. For example, one peer can say "Send this RPC to the object with the NetworkId 103", and everyone knows what object that is.
To add custom code logic to your
NetworkObjects, use NetworkBehaviours.
NetworkObject is owned by a specific client. This can be any client or the server.
Give ownership of an object using the following:
The default behavior is that an object is owned by the server. To give ownership back to the server, you can use the
When you are owner of an object, you can check for
IsOwner in any
NetworkBehaviour, similar to how player objects can do
Player objects are an optional feature in Netcode which can be used to assign a networked object to a specific client. A client can always only have at most one player object.
If you want a client to control multiple objects use the ownership model instead.
Netcode can spawn a default player object for you. If
Create Player Prefab is activated in the
NetworkManager, then Netcode will spawn the prefab marked as
Default Player Prefab in the
NetworkPrefabs list for each client upon connection.
To manually spawn an object as player object, use
SpawnAsPlayerObject instead of the regular
Spawn method. This replaces the old player object with the new one.
The old object will still exist and will be an object owned by the client instead.
To find a player object for a specific client id you can use the following:
To find your own player object just pass
NetworkManager.Singleton.LocalClientId as the clientId in the sample above.