About

The RLBot Core Project builds a RLBotServer.exe binary that allows custom bots and scripts to interface with Rocket League.

This is a rewrite a C++ version that had lived at [https://github.com/RLBot/RLBot/tree/00720d1efc447e5495d3952a03e10b5b762421ee/src/main/cpp/RLBotInterface]

Developer Setup

• Install .NET 8 SDK [https://dotnet.microsoft.com/en-us/download/dotnet/8.0]
• Install an IDE
  • Visual Studio 2022 was used for initial development.
  • Rider and VS Code are also known to work.
• Ensure submodules got cloned
  • git submodule update --init

Building

In Visual Studio 2022, you can build the solution in Release mode, and find the compiled binaries at RLBotCS\bin\Release\net8.0.

• Note: You can also build with the command dotnet build -c "Release"

Deployment

1. Ensure all changes are on the master branch
2. Create a new tag with the next version number - e.x. git tag v0.1.0 -m "Core v0.1.0"
   • Preferably sign the tag too - git tag -s v0.1.0 -m "Core v0.1.0"
3. Push the tag - git push --tags
4. Wait for the Github Actions to build the release and upload it to the release page!

Further deployment steps for automatic updates are still in progress.

Maintenance

Formatting

This project uses the CSharpier formatter. You can run it with dotnet csharpier .

Flatbuffers

The Core project uses flatbuffers, which involves generating C# code based on a specification file called rlbot.fbs. Find this in ./FlatBuffer after it's been generated.

The flatbuffers-schema submodule should be kept update to date:

• cd flatbuffers-schema
• git checkout main
• git fetch
• git pull

The needed Flatbuffers code is automatically generated upon compilation of the project.

Bridge

The Bridge.dll file in RLBotCS/lib is built from a closed-source repository due to legal reasons. It is maintained by RLBot developers who have signed an agreement with Psyonix to keep it private.

The dll file is platform-independent and works for building the project on both Windows and Linux.

rl_ball_sym

The native binaries that live in RLBotCS/lib/rl_ball_sym generate the ball prediction that core then distributes to bots & scripts that request it. The dll/so are dynamically loaded at run time while developing core, and the a/lib files are statically linked during publishing.

All source code and releases for building the dlls can be found at https://github.com/VirxEC/rl_ball_sym_dll but the core of the code is a library that's published for anyone's use at https://crates.io/crates/rl_ball_sym.