Mover/NPP Not Working in Iris Replication

Development Programming & Scripting Multiplayer & Networking
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The problem appears to be that NPP needs FNetworkPredictionProxy::ConfigFunc to be called to remap client generated IDs to server replicated IDs. In Iris, this call never happens. Tracing back, it appears that the only place this kind of call is made is inside of FNetworkPredictionProxy::NetSerialize, so my suspicion is that since Iris doesn’t use custom NetSerializers it never triggers this necessary step. I could be wrong though - that’s just where my investigation points.

(Note: I have mentioned this in two separate calls with Epic and was told that they would “look into it” so I’m opening this ticket in order to track resolution.)

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Steps to Reproduce

  • Build from source in order to enable Iris replication (when attempting in the binary distributed editor I get log lines showing Iris is not part of the build.)
  • Turn on Iris replication. (net.Iris.UseIrisReplication 1)
  • Run the MoverExamples map L_CharacterMovementBasics
  • Note that the character does not move in Client/Dedicated Server mode.
3

The call in question is in NetworkPredictionProxy.h, line 200 or so.

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Also interested in this.

5

Hi,

You are correct that the Network Prediction Plugin will likely need a custom NetSerializer implementation in order to support Iris. This is something that has been discussed, and we do hope to eventually implement Iris support for NPP/Mover.

However, work on these two experimental systems is ongoing, and as such, we do not have any roadmap or timeline to share as to when Iris support will be available for the Network Prediction Plugin and Mover.

Thanks,

Alex