CODEWITHSUNDEEP
unreal-engine4multiplayerunreal-blueprint
Ardian
Ardian

Reputation: 13

Trying to understand Unreal Engine 4 replication

I'm trying to understand how to call events between client and server. My goal for now is simple. I want to create anything that is interactable for 2 players.

Easiest thing I could think of was cube that is switching color when clicked. So I did create actor based blueprint, checked "Replicates" and AlwaysRelevant to be sure. PlayerController is also replicated and there is no pawn needed.

Color change blueprint:
Color change blueprint

SM is just static mesh if that is important. As far as I know client have no authority to call multicast events so I wanted to push it through server but it stops there. Called from server works as expected and color itself IS replicated to client, however client cannot change color himself.

What am I missing in this concept? I've watched like 5 videos about replication and I started to think there is something missing which is either obvious for everyone but me or their examples do not need things I do here.

Upvotes: 1

Views: 5839

Answers (2)

RGD2
RGD2

Reputation: 469

You can't have it in PlayerController, it's got to be in a Pawn, or if not, in PlayerState, or it won't get shared to other clients.

Upvotes: 0

Rotem
Rotem

Reputation: 21917

As you've found out, a player's client can not directly call server RPCs on actors which the player does not own. Calls must be routed through that player's PlayerController. The server copy of the player's PlayerController can then call server methods on server-owned actors.

Another issue is that you seem to be using both RPCs and replicated properties for the same purpose. Unclear to me why changed is replicated since you're modifying it in a multicast event which normally runs on all the machines. This is a recipe for hard to find race condition bugs.

Replication in Unreal is definitely one of the harder concepts to get the hang of. The resource that helped me the most is this guide which while quite dated, is both comprehensive and to the point.

Upvotes: 1

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