About IDs

NetId

Mirage uses uint for NetId. Every NetworkIdentity is assigned a NetId when it is being spawned. Mirage uses the ID when passing messages between client and server to tell which object is the recipient of the message.

Prefab Hash

The prefab hash is used to uniquely identify each prefab so that it can be spawned over the network. Mirage will create the prefab hash by taking a 32-bit hash of the Asset path. The path is found using AssetDatabase.GetAssetPath

Scene ID

Mirage uses ulong for Scene IDss. Every game object with a NetworkIdentity in the scene (hierarchy) is assigned a scene ID in OnPostProcessScene. Mirage needs that to distinguish scene objects from each other because Unity has no unique ID for different game objects in the scene.