UnityCsReference

The .NET source https://github.com/microsoft/referencesource https://github.com/microsoft/dotnet Unity reference source https://github.com/Unity-Technologies/UnityCsReference The above are example of production code. I use these as references all the time Awesome c# https://github.com/quozd/awesome-dotnet

The C# code is open for read access here: https://github.com/Unity-Technologies/UnityCsReference

it already is happening (kinda), they are modularizing their engine, and all the new parts are made open source biggest part what their graphics stack https://github.com/Unity-Technologies/Graphics (only the scripting part) competition is growing, unreal is fully open source, and more and more people have been asking for the source, there was even some drama few years ago when unity DMCA'd (if i remember correctly) a reference source code of unity engine (decompiled) on github, then unity made it officially available on their github: https://github.com/Unity-Technologies/UnityCsReference after users complained about it wich already proved effective and caused them to fix a huge performance issue shortly after: https://github.com/Unity-Technologies/UnityCsReference/pull/...

Unity render pipeline source is available here: https://github.com/Unity-Technologies/Graphics All the C# code running in the editor and runtimes is here: https://github.com/Unity-Technologies/UnityCsReference The code that interfaces directly with the platform API at the C++ level is restricted (you can get access but it's not really a viable option for a beginning graphics programmer :)). For many platforms the APIs themselves are proprietary and therefore that code cannot be shared easily. There's pretty good tooling support around graphics debugging: https://docs.unity3d.com/Manual/RenderDocIntegration.html https://docs.unity3d.com/Manual/FrameDebugger.html