| assetId | カスタム アセット ID の文字列 |
| spawnHandler | クライアント上で使用する spawnhandler メソッド |
| unspawnHandler | クライアント上で使用する un-spawnhandler メソッド |
This is an advanced spawning function that registers a custom assetId with the UNET spawning system.
This can be used to register custom spawning methods for an assetId - instead of the usual method of registering spawning methods for a Prefab. This should be used when no Prefab exists for the spawned objects - such as when they are constructed dynamically at runtime from configuration data.