Instead, the server replicates information about the game state to each client, telling them what Actors should exist, how those Actors should behave, and what values different variables should have. However, the server does not stream visuals directly to the clients' monitors. The clients each remote-control Pawns that they own on the server, sending procedure calls to them in order to make them perform ingame actions. In other words, the server is where the multiplayer game is actually happening. The server, as the host of the game, holds the one true, authoritative game state. The server processes gameplay, and the clients show the game to users. In network multiplayer, the game takes place between a server (1) and several clients (2) that are connected to it. Players connect input to a single computer and control everything on it directly, and everything in the game, including the Actors, the world, and the user interface for each player, exists on that local machine. In a single-player or local multiplayer game, your game is run locally on a standalone game. We therefore advise that you should always program for multiplayer unless you are completely certain that your project will never need multiplayer features.
Introducing networking late in a project is resource-intensive and cumbersome compared with planning for it from the outset. You also will not be prepared for the technical bottlenecks that will be introduced by network speed and stability. Team members will need to re-learn programming best practices that they may have taken for granted up to that point. However, refactoring a codebase that you have already built without networking will require you to comb through your entire project and reprogram nearly every gameplay function. Meanwhile, any gameplay programmed for multiplayer in Unreal Engine will still work in single-player. In the long run, your project will be easier for your team as a whole to debug and service.
If your team consistently implements the extra steps for creating multiplayer, the process of building gameplay will not be much more time-consuming compared with a single-player game. If there is a possibility that your project might need multiplayer features at any time, you should build all of your gameplay with multiplayer in mind from the start of the project.
This page provides an overview of the concepts that drive multiplayer programming, and the tools for building network gameplay that are at your disposal. Unreal Engine features a robust networking framework that powers some of the world's most popular online games, helping to streamline this process. This makes multiplayer programming inherently more complex than programming for a single-player game, as the process of sharing information between players is delicate and adds several extra steps. In a multiplayer session, game state information is communicated between multiple machines over an internet connection rather than residing solely on a single computer.
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