Unity 5 UNet Spawn as Child.

Hello everyone !

I got a problem trying to instantiate a GameObject across the network as a child on the "Canvas" GameObject, trying to make a UI like what is shown in the Unity 5 UNet presentation (See below.).

Also , instead of LocalPlayer authority, almost everything is handled by the server.

In the video, they create an UI with the Legacy system, I'm trying to create one from a Prefab with the new UI system, hence why I need to spawn the UI as child of the "Canvas" GameObject.

From what I already got, Unity doesn't do it natively.

I already read this answer (http://answers.unity3d.com/questions/989015/unet-spawn-object-to-parent.html) and implemented it, but the ID never gets reconized.

I did called NetworkServer.RegisterHandler(...) by creating an AdvancedNetworkManager that heritate from NetworkManager, and overrided the void OnClientConnect(NetworkConnection conn) function.

Here's some screens and code :

AdvancedNetworkManager.cs :

 public class AdvancedNetworkManager : NetworkManager
 {
     public override void OnClientConnect(NetworkConnection conn)
     {
         base.OnClientConnect(conn);
 
         Debug.Log("Registering Server callbacks ...");
         Debug.Log("Registered Message (ID : " + Message.SetParent + ")");
         NetworkServer.RegisterHandler(Message.SetParent, SetParentMessage.OnSetParent);
     }
 }

Utils.cs :

 public class Utils
 {
     public static void LinkToParent(GameObject child, GameObject parent, bool stay)
     {
         child.transform.SetParent(parent.transform, false);
         Debug.Log("Link to parent called (ID : " + Message.SetParent + ")");
         NetworkServer.SendToAll(Message.SetParent, new SetParentMessage(child, parent, stay));
     }
 }

Message.cs :

 public class Message
 {
     // used for auto-increment
     private enum Type
     {
         SetParent = MsgType.Highest + 1
     }
 
     public const short SetParent = (short)Type.SetParent;
 }
 
 public class SetParentMessage : MessageBase
 {
     public NetworkInstanceId netId;
     public NetworkInstanceId parentNetId;
     public bool woldCoordStay;
 
     public SetParentMessage()
     {
     }
 
     public SetParentMessage(GameObject gameObject, GameObject parent, bool stay)
     {
         netId = GetNetId(gameObject);
         parentNetId = GetNetId(parent);
         woldCoordStay = stay;
     }
 
     private static NetworkInstanceId GetNetId(GameObject obj)
     {
         // NOTE: no error handling
         return obj.GetComponent<NetworkIdentity>().netId;
     }
 
     public static void OnSetParent(NetworkMessage netMsg)
     {
         Debug.Log("OnSetParentCalled (Finally ...)");
         SetParentMessage msg = netMsg.ReadMessage<SetParentMessage>();
         ClientScene.objects[msg.netId].transform.SetParent(ClientScene.objects[msg.parentNetId].transform, msg.woldCoordStay);
     }
 }

The code Intatianting the UI is only called on the server and is as followed :

 uiInstance = Instantiate<GameObject>(combatUI);
     
 NetworkServer.Spawn(uiInstance);
     
 Utils.LinkToParent(uiInstance, canvas, false);

Here's the Log I'm getting on the Client :

And here's the Log I'm getting on the Server(Which is also a Client) :

I really don't get it, is there something wrong in this ?

I hope I'm clear enough.

Thanks for your time. This is getting me crazy !

(UNet presentation : https://www.youtube.com/watch?v=ywbdVTRe-aA)