Synchronizing Data and GameObjects with Relay

Ensuring data synchronization in a multiplayer game can be a complex task. Unity's Relay service provides an essential networking layer for data transmission between clients via a centralized relay. While Relay does not inherently support data or GameObject synchronization, it can be used in combination with other Unity services and custom implementations to achieve these functionalities. This article provides a thorough guide on how to handle data and GameObject synchronization in Unity using Relay.

Understanding the Role of Relay

Relay serves as an intermediary between game clients, efficiently routing network traffic and ensuring data reaches the correct destination. However, it's important to note that Relay's primary function is data transport. It doesn't manage a game state or provide built-in support for synchronizing game data such as player positions, GameObject states, or other dynamic elements of your game.

Synchronizing Data and GameObjects

While Relay doesn't natively support synchronization, you have several options to achieve this in your game:

• Netcode for Game Objects (formerly Unity Multiplayer, or UNET): This high-level API is an excellent choice for synchronizing GameObjects in your game. With features like Remote Procedure Calls (RPCs) and the SyncVar attribute, you can control the network state of GameObjects across different clients, ensuring that game states are consistently replicated across all players.
• Netcode for Entities (part of Unity's Data-Oriented Technology Stack, or DOTS): If you're developing your game with DOTS, Netcode for Entities can provide synchronization for your GameObjects. The DOTS-based system offers performance advantages and can be a suitable choice for large-scale, high-performance games.
• Custom Implementation: If your game requires unique networking features or you wish to maintain granular control over data transmission and synchronization, creating a custom synchronization system may be the way to go. In this case, you would use Relay to handle the actual data transmission, while your custom code manages state synchronization and game logic.