UnityCSReference is a reference-only source code repository that provides read-only access to the C# implementation of the Unity engine and editor.
The repository exists to allow developers to examine how Unity's C# components are implemented internally. It serves as a learning and debugging resource, enabling developers to understand the engine's behavior by reading the actual source code rather than relying solely on documentation or decompiled binaries. The code is organized to match Unity's internal source tree structure, though this layout may shift between engine versions.
Developers should treat this repository as a reference tool only. The license explicitly prohibits modification or redistribution of the code in any form. Those needing to modify Unity's source code must obtain a commercial source code license through Unity sales. The repository does not accept pull requests; bug reports should be filed through Unity's official Bug Reporter instead. This is appropriate for developers who want to understand engine internals, debug complex issues by reading source, or learn from Unity's implementation patterns, but not for those seeking to extend or customize the engine itself.
The project receives updates aligned with Unity engine releases, with the folder structure and file organization potentially changing between versions. Bug reports are directed through official channels rather than GitHub issues, reflecting the reference-only nature of the distribution.
