This was one of my first custom game engines, and my first foray into using OpenGL for a serious project. Unfortunately, I have lost all of the source code, but the image below is what I was able to save from a dear imgui screenshot thread.
* The editor also had auto-generated previews as shown for models, textures, and materials.
* Skybox support using cubemapping, this was also used for lighting my "PBR shader" (hint: as you can tell in the screenshot, I didn't know how to gamma correct anything in 2016.)
This is succeeded by my first Vulkan game engine, [Graph]({{< ref graph >}}).