Hello! I’m making my own 3d engine in C and this is such a good game and inspiration! I also wanted to add a level editor to my engine, so how does this one works? Based on Trenchbroom? Can I find the sourcecode somewhere ?

the in-game editor is built primarily using Dear ImGui; the .map file support that allows us importing maps made in TrenchBroom uses the libmap library (ported to Haxe for my own ease of use, but the original is in C so should be more relevant to your usecase)

Thanks dude and really a good job you made!