Godot-matcha is an addon that lets you use WebRTC for multiplayer games by handling matchmaking using WebTorrent trackers. Conceptually it’s quite an interesting, novel approach.
WebTorrent uses a modified BitTorrent protocol that allows it to work with WebSockets. A WebTorrent tracker is essentially a directory service that keeps track of torrents offered by users. A torrent is uniquely identified by its info_hash, so if you have the torrent information, you can look up who is offering a file for download.
Rather than tracking a specific torrent file, godot-matcha generates a random identifier, which it uses as a room (or lobby). If another player has the same identifier they exchange the WebRTC’s SDP details to establish a connection.
Connecting players this way is essentially free. This is a suitable approach for mobile games, for example, where you start a game, and share an identifier with someone else to join in. Mobile party games, for example, use such an approach: One player starts a game, and others join by using some random id such as “FJRLE”.
While godot-matcha is a great proof of concept, I’ve done some testing that showed that the various clients disagree on their unique IDs. This results in challenges when setting the multiplayer authority, a key part of making the high-level multiplayer abstraction work well. The reason for the mismatch is how godot-matcha creates offers, which sets a random id as peer ID before the peers are even connected.
New to Godot Engine? Want to get started creating awesome games quickly? Just use AI! AI learns (is trained) from online content (which is a whole separate topic). As a result, the quality of the answers the AI provides is based on the volume and variety of content available to learn from. Since Godot is …
The Terrain3D addon for Godot lets you create and manage 3D terrains within Godot. It looks quite promising for making landscapes, hills, valleys, and other natural environments. The addon provides tools for sculpting the terrain, and you can paint different textures like grass, dirt, or rock, and blend them smoothly. It also supports features like …
Right after I got my Steam Deck, I wanted to know how hard it is to get a Godot game running on it. What’s the developer experience for someone who’s stepping through this for the first time? It was really easy to do, so I’m sharing this here, whether you’re following along or like to …
A smaller update. The inventory components now have custom icons to make it easier to tell them apart. This release also includes additional bug fixes:
godot-matcha: Free multiplayer without a server
Godot-matcha is an addon that lets you use WebRTC for multiplayer games by handling matchmaking using WebTorrent trackers. Conceptually it’s quite an interesting, novel approach.
WebTorrent uses a modified BitTorrent protocol that allows it to work with WebSockets. A WebTorrent tracker is essentially a directory service that keeps track of torrents offered by users. A torrent is uniquely identified by its info_hash, so if you have the torrent information, you can look up who is offering a file for download.
Rather than tracking a specific torrent file, godot-matcha generates a random identifier, which it uses as a room (or lobby). If another player has the same identifier they exchange the WebRTC’s SDP details to establish a connection.
Connecting players this way is essentially free. This is a suitable approach for mobile games, for example, where you start a game, and share an identifier with someone else to join in. Mobile party games, for example, use such an approach: One player starts a game, and others join by using some random id such as “FJRLE”.
While godot-matcha is a great proof of concept, I’ve done some testing that showed that the various clients disagree on their unique IDs. This results in challenges when setting the multiplayer authority, a key part of making the high-level multiplayer abstraction work well. The reason for the mismatch is how godot-matcha creates offers, which sets a random id as peer ID before the peers are even connected.
In contrast, the godot-demo-projects repository has a webrtc_signaling demo, which uses the lobby/signaling server to tell the clients their ID, so that all clients (including the one acting as the server) add the same peer ID.
Related Posts
Creating games with Godot Engine using AI
New to Godot Engine? Want to get started creating awesome games quickly? Just use AI! AI learns (is trained) from online content (which is a whole separate topic). As a result, the quality of the answers the AI provides is based on the volume and variety of content available to learn from. Since Godot is …
Terrain3D for Godot has been released
The Terrain3D addon for Godot lets you create and manage 3D terrains within Godot. It looks quite promising for making landscapes, hills, valleys, and other natural environments. The addon provides tools for sculpting the terrain, and you can paint different textures like grass, dirt, or rock, and blend them smoothly. It also supports features like …
Running Godot Games on Steam Deck
Right after I got my Steam Deck, I wanted to know how hard it is to get a Godot game running on it. What’s the developer experience for someone who’s stepping through this for the first time? It was really easy to do, so I’m sharing this here, whether you’re following along or like to …
Inventory System v1.4 available
A smaller update. The inventory components now have custom icons to make it easier to tell them apart. This release also includes additional bug fixes: