Godot Rollback Netcode

This is an example of Rollback Netcode implemented in Godot with GDScript and Universal Plug and Play. No port forwarding required!

If you want a more production ready version of this netcode, complete with WebRTC support and possible steam integration, then I suggest you check out tthis plugin by Snopek Games: https://gitlab.com/snopek-games/godot-rollback-netcode/

Major thanks to @SpiceyWolf for contributing to this project.

PULL REQUESTS WELCOME

Explanation of Rollback Netcode: https://ki.infil.net/w02-netcode.html

Basic Rollback Netcode Algorithm: https://gist.github.com/rcmagic/f8d76bca32b5609e85ab156db38387e9

Deeper Explanation (using code): http://blog.hypersect.com/rollback-networking-in-inversus/

Local Testing

For testing on a single computer, you will want to have two different clients open at the same time. Make sure that they are both set to Local and make sure only ONE is set as Player One.

Further Research

• Figure out how to do this with WebRTC
• Add more players
• Integrate fixed point libraries
  • Current plan is to create a fork of Box2D with the C++ Library fpm to make it deterministic and then make that a Godot module.
  • Alternatively, we could use this library that's already a fork of Box2D thats determinisitic
  • Biggest problem is figuring out how to add custom phsyics to Godot

Resources

General Game Stuff

Introduction to State Machines:https://gameprogrammingpatterns.com/state.html

General Networking:

Networked Physics:https://www.gafferongames.com/post/introduction_to_networked_physics/

Also the full website is pretty cool (General Networking Bible)https://gafferongames.com/

Master list of resources: https://github.com/MFatihMAR/Game-Networking-Resources

Godot Networking:

Basic multiplayer documentation: https://docs.godotengine.org/en/stable/tutorials/networking/high_level_multiplayer.html

Multiplayer Tutorials: Used to build the prototypeFiles · master · menip / Godot Multiplayer Tutorials · GitLab

First video in a series on how to do dedicated servers in Godot.Godot Multiplayer Server-Client Tutorial | Godot Dedicated Server #1 - YouTube

Very minimalistic tutorial on how to set up a godot dedicated server.https://mrminimal.gitlab.io/2018/07/26/godot-dedicated-server-tutorial.html

NAT Holepunching Plugin: https://github.com/SLGamesCregg/HolePuncher

General Godot Stuff:

How to format your gdscript code: https://github.com/Scony/godot-gdscript-toolkit

How to do camera on multiple people:https://www.youtube.com/watch?v=W7WsL3qaPqg

FPS Networking:

Source Engine Networking (Valve):https://developer.valvesoftware.com/wiki/Source_Multiplayer_Networking

Overwatch Networking:https://www.youtube.com/watch?v=W3aieHjyNvw

Halo Reach Networking:https://www.youtube.com/watch?v=h47zZrqjgLc

Quake Cheats: http://www.catb.org/esr/writings/quake-cheats.html

Tribes Networking Model:https://www.gamedevs.org/uploads/tribes-networking-model.pdf

Extrapoliation/Dead Reckoning:https://www.gabrielgambetta.com/entity-interpolation.html

MMO Networking (I Think): http://ithare.com/contents-of-development-and-deployment-of-massively-multiplayer-games-from-social-games-to-mmofps-with-stock-exchanges-in-between/