Multiplayer Chat

Description

MultiplayerChat adds a fully functional in-game text chat system to Subnautica 2's cooperative multiplayer. Communicate with your fellow pioneers without ever leaving the game - no overlays, no external apps, just native in-game chat.

The mod hooks directly into the game's networking layer using `ServerExecRPC` and `ClientMessage`, meaning messages are transmitted through the existing multiplayer connection. The chat UI is built by reparenting the game's native Watermark widget to the left side of your screen, so it blends naturally with the Subnautica 2 HUD aesthetic.

Chat automatically fades out after a few seconds of inactivity to keep your view clean, and reappears whenever a new message arrives or you open the chat input.

Installation

1. Install UE4SS - Download and install UE4SS for Subnautica 2. The mod framework should be placed in:

Subnautica2/Binaries/Win64/

2. Install MultiplayerChat - Copy the MultiplayerChat folder into the UE4SS Mods directory:

Subnautica2/Binaries/Win64/ue4ss/Mods/MultiplayerChat/

Your folder structure should look like:

└── MultiplayerChat/

├── metadata.json

└── Scripts/

└── main.lua

3. Enable the mod - Make sure the mod is enabled in UE4SS. If you have a mods.txt file, add:

MultiplayerChat : 1

4. Launch the game - The mod loads automatically. You'll see v1. 1 loaded in the UE4SS (Dev Edition only) console when it initializes.

Main Features:

Native In-Game Chat

- Send and receive text messages in real-time during multiplayer sessions

- Messages are broadcast to all connected players using Subnautica 2's built-in networking

- Player names are automatically displayed alongside messages

Full Text Editing

- Left / Right Arrow - Move the cursor through your message

- Ctrl + Left / Right - Jump between words

- Backspace - Delete the character before the cursor

- Up / Down Arrow - Recall previously sent messages (stores up to 50)

Smart Input Handling

- Press T to open chat - works on foot, swimming, and in vehicles

- Press Enter to send your message

- Press Escape to cancel your message and close chat (opens main menu for now, needs fixing)

- All character movement (walking, swimming, jumping) is frozen while typing so you don't accidentally drift away mid-sentence

Clean HUD Integration

- Chat appears on the left side of the screen with Subnautica-styled cyan-white text

- Automatically fades out after 6 seconds of inactivity

- Reappears instantly when a new message arrives or you press T

- Completely disabled in the main menu - only activates during gameplay

Configurable

All settings are exposed at the top of main.lua in the Chat. Config table:

| Setting | Default | Description |

| `Singleplayer` | `true` | Enable chat in singleplayer / non-hosted saves |

| `MaxMessages` | `10` | Number of messages visible in the chat window |

| `MaxCharLimit` | `75` | Maximum characters per message |

| `FadeoutTime` | `6. 0` | Seconds before chat auto-hides |

| `PositionX` | `1. 0` | Horizontal offset from the left edge |

| `PositionY` | `200. 0` | Vertical offset from the top |

| `WidgetWidth` | `500. 0` | Chat widget width |

| `WidgetHeight` | `400. 0` | Chat widget height |

| `TextColor` | Cyan-white | RGBA color of chat text |

| `ShadowColor` | Dark blue | RGBA color of text shadow |

Notice

The mod is still in early development, please report any issues you encounter while playing. All players in the session need to have the mod in order to see the chat.

Contributions are also welcome on the GitHub Release of the mod.

Requirements

- Subnautica 2 (obviously)

- UE4SS Unreal Engine scripting framework (Lua mod loader)

- A multiplayer session with at least one other player (or set `Singleplayer = true` for Singleplayer testing)

Shout Outs

- UE4SS Team - For building the incredible Lua modding framework that ma