[Runtime Issue]: Rendering effects missing

[JeodC]

Description

In Direct3D, some special rendering effects such as specular highlights, lighting, reflections etc are used, but in OpenGL they are missing. Images below show the differences. The first two images showcase the effects in Direct3D rendering. The final image showcases how the game renders in OpenGL.

Modern times call for modern solutions. Document what is happening here and, if possible, enable it on OpenGL, which should be able to handle all of this in the current year.