CODEWITHSUNDEEP
unity-game-enginenetwork-programming
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Reputation: 21

How to use ClientRpc (or ServerRpc) in unity Netcode for GameObject?

I'm having trouble understanding how to use those Rpc's correctly. Sometimes they work sometimes they don't. Example : I have this gameobject that is in the scene (not instantiated on connection), called "Book", it has a script ("SpellManager") so when both player connect, they both have this object in their scene. Now in that SpellManager script, I want my Host/Server to change a spell variable on collision. Let's say I have a "string newSpell" variable, how do I change this variable on the server side and then send the information to the clients ? I have tried something like this (simplified) :

    private string newSpell;

    private void OnTriggerEnter(Collider other)
    {
        if (NetworkManager.Singleton.IsServer)
        {
            newSpell = "Earth";
            testClientRpc(Time.frameCount, newSpell);
        }
        else
        {
            print("OnClient ");
        }
    }
    [ClientRpc]
    public void testClientRpc(int somenumber, string _newSpell)
    {
        newSpell = _newSpell;
    }

But this trows an error on the server : NullReferenceException: Object reference not set to an instance of an object Unity.Netcode.NetworkBehaviour.get_NetworkManager () (at Library/PackageCache/[email protected]/Runtime/Core/NetworkBehaviour.cs:219) And it's coming from the _newSpell variable which is apparently null ? I even tried hardcoding newspell = "Earth" in the ClientRpc, same error. An example/video would be much appreciated, I couldn't find anything similar

Upvotes: 2

Views: 5740

Answers (1)

Light Fury
Light Fury

Reputation: 53

  1. The Object which has a Script deriving from the NetworkBehaviour (because you are using RPC) must have a NetworkObject component attached to it.
  2. If you are calling the RPC from a Non-Owner object, you must set the requireOwnership option to false in the attribute options i.e. [ServerRpc(requireOwnership = false)]

Upvotes: 2

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