[quote=“Danv, post:2, topic:387”]i think UnReal World sight system will be good here, for player and for creatures, so many possibilities, and as nice addition - mutations/implants which allows you (and creatures) to see in wider angle or even in 360 (eyes on back, antenas, sensors, cameras and so on), but it’s really huge code rework, so it’s only in my dreams 
a bit simpler solution - sneaking and sneak skill[/quote]
I have to say if there is one feature that stops me playing games it’s sight systems like UnReal World. They are so jarringly detached from reality that they make it hard to immerse in a game and, for me at least, don’t improve game play at all.
As to making it harder to be spotted based on light levels that would be an easy change as the data is already available, it would just be a matter of making the critter not react.