MultiplayerSubEditor

MultiplayerSubEditor

Bring real-time multiplayer collaboration to the Barotrauma submarine editor.

Overview

This mod transforms the original single-player submarine editor into a real-time multiplayer collaborative editing mode that can be used together on a server. Players can select "Multiplayer Submarine Editor" in the lobby, start an editing session, and other players can join the same editor to build any type of submarine together.

The mod supports remote cursor, selection, and drag state synchronization, along with collaborative features such as in-editor chat, player list, blank submarine creation, late joining, and lobby return. You can also launch a multiplayer test from the editor to verify the submarine's actual performance with other players.

Key Features

• Real-time Collaboration: Synchronizes entity creation/deletion, move/scale, properties, inventory, wiring, layers, and circuit box editing.

• Collaboration Visualization: Displays other players' cursors, selected entities, and drag states.

• Full Session Support: Includes editor chat, player list, late joining, blank submarine, and lobby return features.

• Multiplayer Live Testing: Enter sandbox testing via player confirmation and restore editor state afterward.

Special Features

• Create Blank Submarine: When selecting a submarine in the lobby, check "Create Blank Submarine" in the submarine list.

• Tab Hotkey: While in the editor, press the Tab key to open the tab bar, where you can view the player list. More importantly, check the notes in the info panel — not understanding them may lead to actions that crash the game.

• Chat Window: In the lower-left corner of the editor, there is a chat window button. Click it to open the chat window. Chat hotkeys are also restored: T to type, B to collapse, Enter to send.

• Sync Button: After a player joins mid-session or after completing major changes, use the sync button to ensure submarine consistency. This button is located in the upper-left corner.

• Multiplayer Submarine Testing: Initiate multiplayer testing from within the editor. After player confirmation, enter a sandbox test round, and return to the editor to continue editing when the test ends.

Notes

• Prerequisite Mod: LuaCsForBarotrauma — all participating players must install Lua and enable C# support, otherwise the mod will not work.

• Permission Requirements: Editor sessions must be started and ended by the host or a player with ManageRound permission.

• Save Promptly: When multiple players edit a complex submarine simultaneously, save regularly and resync the submarine after major changes.

• Compatibility: This mod uses runtime patches and may conflict with mods that modify the submarine editor, wiring, or circuit box logic.

Very, very important: Since the mod is still in testing, there are still some unresolved minor issues. Read the notes in the Tab bar info page to understand all risky operations.

If you encounter any issues while using the mod, feel free to leave feedback in the comments section. I will fix them as soon as possible (probably).