You mean you're actually going to add significantly more detail to structures, architecture, building, and other meshes? If you noticed TW3 lighting sucks and no matter how detailed your textures are, even with ambient and specular parts, many surfaces look flat if you look at them at an angle. They only look good at 90 degrees.
The problem with adding more detail via polygon count is that it kills performance. For example, Novigrad Reloaded make cobble stones bumpy via mesh (not textures) and FPS drop is crazy high on any system.
On point. Hulk work is absolutely awesome. But... without proper lighting - I'm not even talking about meshes. If you think about RTX raytracing and what it did with QUAKE 2 you can clearly see that lighting is the most important part. It is true for paintings and 3d graphics. Without it witcher 3 will look outdated no matter what you do. The same applies to SKYRIM... ultra super textures but light sucks.
If we could add a true SUN and activate RTX, kill other fake lights beside lamps etc. (you can see a presentation of new METRO with RTX with only one light source.... ) This game would destroy our minds.
Is it possible? Maybe in 5-10years time companies will try to sell as thier products again with that kind of improvement? (RAYTRACING, true water, volumetric sky / clouds / mist ETC).
Why is that? Modkit has no Unknown Bytes for ENV files that alter lighting. ENV files can be fully edited, but they won't bring new features.
Would source code allow for a brand new lighting system?
Of course not. I'm saying:I hope that you didn't abandon this project. Say something, my good man.