Basic multiplayer replication help for the first person character

Development Programming & Scripting Multiplayer & Networking
1

Hey,

I am trying to learn how replication works and wanted try and implement it myself so i can understand how it works / edit if need be.

Using the FirstPersonCharacter example it replicates for me automatically other than the pitch. so i have unchecked ‘replicate movement’ and kept ‘replicates’ on. This seems to remove the auto replication for me.

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So im trying to start with the mouse input part of the event graph. And ‘InputAxis Turn’ to start with.

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I believe i have setup the multicast and server cast correctly as follows, but nothing replicates i only have control on the window i have selected:

3.png

I think this is becasue the target is not set and im not sure what to put there?

I tried using ‘Get player Pawn’ but it is obviously based upon the index and there for controls both charcters when replicated like this.

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How would i go about solving this, im pretty sure i have the casting setup correctly (or atleast somewhat close) i just do not know how apply the yaw input to the correct ‘FirstPersonCharacters’ respectively.

Any help would be greatly appreciated.

I did also find this on another post which seems to explain the concepts pretty well:

Thanks

2

Hi, “AddControllerYawInput” and “AddControllerPitchInput” will only do something if the local player controller is executing this, otherwise it will do nothing. Therefore Multicast and RunOnServer makes no sense there.

I never disabled replicated movement on a character, so no idea, but maybe you need to set the rotation manually now via “SetActorRotation”.

You could read this here to get a bit of a feeling of how the character movement components replication works under the hood Understanding Networked Movement in the Character Movement Component for Unreal Engine | Unreal Engine 5.3 Documentation and keep in mind that you cannot properly rebuild this in blueprints.

3

Thanks, that makes perfect sense.

Turns out i was thinking about it wrongly.

I am rotating locally, therefor i need to get my rotation and send it to the server. The server then needs to tell everyone my rotation and then set it.

I had a read through and also watched through this video:

and

Based on the above i managed to figure it out as follows:

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Please note that my ‘FirstPersonCharacter’ has ‘Replicates’ enabled.

Thanks again for the help!