This seems to be practically useless. about unitydecompiled HOT 2 CLOSED

This is often the first place I go when I'm extending the editor. I've found it useful for many other things as well. Thanks!

from unitydecompiled.

It doesn't have decompiled native code, only the C# code. It's not useless, it's very handy when trying to figure out how certain things in the editor work, especially when making custom editor tools. And even if it had the native code, you wouldn't be able to recompile it anyway.

For physics stuff specifically, Unity uses PhysX under the hood, so you can look at the PhysX source code to learn more about how that works.

from unitydecompiled.