Fake lighting

[Trass3r]

DK2 used precalculated per-vertex lighting via vertex colors: https://www.reddit.com/r/gamedev/comments/hrz910/fake_lights_and_shadows_in_dungeon_keeper_2/

Something similar could be implemented, e.g. to get some cheap AO (#463).

Things to consider:

• torch lights influence
• height differences (darker in "valleys", lighter on "peaks", esp. with Implement wonky walls like in DK2 #108)
• exposure (more flat surrounding tiles means more ambient light)
• distance from walls (gradual darkening near walls as simple ambient occlusion)
• room type?

[Trass3r]