NetworkList duplicated entries on clients

Unity Engine
,
1

Hey guys! Im trying to implement network lists and for some reason clients are getting duplicated data.
My list is a networklist of a simple struct

[System.Serializable]
public struct ShipPart : INetworkSerializable, IEquatable<ShipPart>
{
    public FixedString128Bytes ID;
    public int Index;
    public int CurrentArmorPoints;
    public int MaxArmorPoints;

    public bool Equals(ShipPart other)
    {
        return other.ID == ID;
    }
    public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter
    {
        serializer.SerializeValue(ref CurrentArmorPoints);
        serializer.SerializeValue(ref MaxArmorPoints);
        serializer.SerializeValue(ref ID);
        serializer.SerializeValue(ref Index);
    }
}

and as you can see on the following screenshots, the server has the correct amount of elements but the client has duplicated data:
Server:
9547438--1348921--upload_2023-12-25_13-33-39.png
Client:
9547438--1348924--upload_2023-12-25_13-33-56.png

The data is added on the server on networkSpawn of the ship and i was able to consistently reproduce this via the following steps:
1: Host
2: Client joins
3: Server spawns networkobject and on spawn populates the list

After this, data is desynced between server and client.
Does anybody know why this is happening andhow to solve it?

2

Does anybody use network list with structs?

3

I’ve used them in the past and I had a recollection of seeing duplicated network list data on the client. I did some searching and I mentioned it here, it may not be related to your problem as that seemed to be triggered by a network variable change.

It might be worth creating a Github issue on it, especially if you can reproduce it in a small project.

4

oh… thats sad, ill see about creating a github issue in the near future.
in the meantime, what do you use instead? say you need a list of objects that are not necesarelly networkobjects, like maybe a list of ship parts?
thanks for your reply :slight_smile: !

5

I’d stick with what you’re doing if you’re happy with it and try figure out the issue. Network lists were reliable last time I checked so it would be good to work out what’s wrong as it sounds like a bug that needs fixing.

I did try replicate what it sounds like you’re doing but I don’t see the issue. You might have to create that small project or share enough of the project setup and code to be able to reproduce it.

1 Like
6

Will do, thanks m8!

7

@Complex77
Not sure if this will help you, but I put together a quick (simple) example of using NetworkLists for another user and you might find this project useful for either creating a replication of the issue you are experiencing or tracking down what the issue might be on your end.

Also:

  • The INetworkSerializable looks fine to me… so you might provide the script that adds the parts and is logging the information.
  • Also, make sure there isn’t any form of static list (or NetworkList for sure) getting both the host and client’s parts.

9567916–1353790–NetworkVarExample.zip (45.7 KB)

1 Like
8

Ok, will do so. I did another project to test network lists and I was not able to replicate the issue.
I’ll head back to where my code is breaking to try to understand why they desync.
Thanks guys