ZDoom

Sorry, no exposition of render-only data to the playsim. Additionally, who guarantees that a better lighting model will render this whole thing inoperable? For that it'd be enough to offload these calculations to the GPU.

Basically just some way to retrieve the colour tint that an actor receives based on any nearby lights and coloured sectors. Ideally the amount of light affecting the actor should be available too (I'm currently only aware of floorsector/ceilingsector.lightlevel, which obviously doesn't take dynamic lights into account)