NetworkObjectProvider

INetworkObjectProvider

當調用Spawned時，在StartGame() StartArgs中傳遞的INetworkObjectProvider處理獲取/建立將附加的遊戲物件。

NetworkObjectProviderDefault

INetworkObjectProvider的預設實作是NetworkObjectProviderDefault。如果在啟動運行器時沒有在StartArgs中指定提供者，運行器將在運行器遊戲物件中搜尋INetworkObjectProvider元件。如果沒有找到，運行器將自動新增NetworkObjectProviderDefault。

這個非常基本的實作將通過具現化傳遞的預製件的副本來生成物件，以回應Spawn()，而不需要任何輪詢。相反，Despawn()調用是用Destroy()處理的。

輪詢

建立輪詢物件而不是具現化和銷毀物件的INetworkObjectProvider的最簡單方法是從NetworkObjectProviderDefalt衍生並覆寫InstiatePrefab和DestroyPrefabInstance：

C#

public class PooledNetworkObjectProvider : NetworkObjectProviderDefault
{
    protected override NetworkObject InstantiatePrefab(NetworkRunner runner, NetworkObject prefab)
    {
        // Get object from pool and return it.
    }

    protected override void DestroyPrefabInstance(NetworkRunner runner, NetworkPrefabId prefabId, NetworkObject instance)
    {
        // Return the instance to the pool.
    }
}

生成自訂物件

不依賴於重新製作的預製件，而是可以在運行時構建自訂的網路物件。

重要提示： 一旦生成並附加，網路物件就不能新增或刪除網路行為。在生成之前，必須對網路物件上的網路行為進行任何自訂。當然，仍然可以新增及刪除任何非網路元件。

C#

public class BakingObjectProvider : NetworkObjectProviderDefault
{
  // For this sample, we are using very high flag values to indicate that we need to do a custom instantiate
  // Values lower than this will fall through the default instantiation handling.
  public const int CUSTOM_PREFAB_FLAG = 100000;

  // The NetworkObjectBaker class can be reused and is Runner independent.
  private static NetworkObjectBaker _baker;
  private static NetworkObjectBaker Baker => _baker ??= new NetworkObjectBaker();

  public override NetworkObjectAcquireResult AcquirePrefabInstance(NetworkRunner runner, in NetworkPrefabAcquireContext context, out NetworkObject result)
  {
    // Detect if this is a custom spawn by its high prefabID value we are passing.
    // The Spawn call will need to pass this value instead of a prefab.
    if (context.PrefabId.RawValue == CUSTOM_PREFAB_FLAG)
    {
      var go = GameObject.CreatePrimitive(PrimitiveType.Cube);
      var no = go.AddComponent<NetworkObject>();
      go.AddComponent<NetworkTransform>();
      go.name = $"Custom Object";

      // Baking is required for the NetworkObject to be valid for spawning.
      Baker.Bake(go);

      // Move the object to the applicable Runner Scene/PhysicsScene/DontDestroyOnLoad
      // These implementations exist in the INetworkSceneManager assigned to the runner.
      if (context.DontDestroyOnLoad)
      {
        runner.MakeDontDestroyOnLoad(go);
      }  
      else
      {
        runner.MoveToRunnerScene(go);
      }

      // We are finished. Return the NetworkObject and report success.
      result = no;
      return NetworkObjectAcquireResult.Success;        
    }

    // For all other spawns, use the default spawning.
    return base.AcquirePrefabInstance(runner, context, out result);
  }
}