Resolved NetCode and Spawn Classification Examples

• The default spawn behaviour is "Delayed". Calling `EntityManager.Instantiate()` with any entity ghost prefab (on the server) will give you this behaviour by default.
• "Client Predicted" spawning is a layer on top of the above, where the client runs the same code as the server (via prediction) and therefore also spawns the entity (see Bullet spawning in Asteroids via the badly named `SteeringJob`. Note how the `SteeringSystem` is in the `[UpdateInGroup(typeof(PredictedSimulationSystemGroup))]`). The client bullet (which is a fake ghost) then gets mapped to the server bullet via the `DefaultGhostSpawnClassificationSystem`. If it fails to map within a time limit, we assume a miss-prediction occured, and the invalid client bullet is destroyed.
• "Player Spawned" is "Client Predicted". It must be predicted, because the client does not have the authority to spawn entities by themselves. I.e. The only thing the client is allowed to do is predict spawn a ghost that it expects the server to also predict spawn.

 

Correct. If you notice, there is (correction) only one bit of code in the `SteeringSystem` that is client specific.
`isFirstFullTick == 1` (which is populated via the `NetworkTime` singleton).

Because it's in the `PredictedSimulationSystemGroup`, it'll run identically on both the client and server. The only nuance is that on the client, prediction runs multiple times per frame, so isFirstFullTick ensures that you only create the bullet once on the client (the first time you predict this frame). I recommend reading this manual on prediction: https://docs.unity3d.com/Packages/com.unity.netcode@1.0/manual/prediction.html

In earlier versions you had to explicitly define a client ghost as a predicted spawn (via an API), but we were able to remove that in 1.0. See CHANGELOG.md entry:

• The GhostCollectionSystem.CreatePredictedSpawnPrefab API is deprecated as clients will now automatically have predict spawned ghost prefabs set up for them. They can instantiate prefabs the normal way and don't need to call this API.