The resulting games looked similar to Duke Nukem 3D - just that it did not come with a level editor like Build but you had to lay out the level on paper and program the coordinates and sector heights manually. It was a DOS engine that you had to program with C++.
One of the most early 3D game engines I remember I wanted to learn was around 1997. Either that or you had to settle for an engine that was pretty much genre specific like the FPS creator. And I mean actual coding not "just" scripting. Chosen by top developers including 2K Games, Tencent, Firaxis, Sony, Shanda, and NCsoft, Gamebryo has been proven a solid and reliable foundation for numerous successful. Only 7 years ago the flexible tools were pretty inaccessible to someone who was not able to code. Gamebryo Technology This mature engine simplifies development by providing a complete toolset, flexible workflow, rapid prototyping capabilities and a high-performance runtime. I think sometimes people are not really aware just how much Unity has helped shape the accessibility of the Indie games market over the last few years. Though I am pretty sure that when I was working at said company who created projects on Gamebryo it was simply more common than today that complex engines did not have a nice user interface and frontend. It also means you can tailor the whole thing to your project.
So if you know enough about the inner workings of the engine and have enough time and manpower you could change to your hearts desire.
#Gamebryo engine has improved code#
I only worked on the artist side of it all so I can only tell from my perspective: In terms of source code think: Unreal Engine 4 source code.