visibility algorithm

[Alpha Centauri Bear]

Pardon the question that was probably asked many times but I didn't find an answer here.
How visibility is computed all variables accounted for: race, light, smoke, fire? Any comprehensive article or explanation? Thank you.

[Alpha Centauri Bear]

Found my answer about smoke here.
https://www.ufopaedia.org/index.php/Smoke_Grenade#Visual_range

Apparently, its thickness degrades with time and it is not possible to tell how thick it is just by looking at it. Ugh.

[Yankes]

In recent version OXCE change how viability work, as previously some things do not stack with each other.
Now most things stack (camouflage, smoke, light).

Beside, you have full access to code you can see what happens there:
https://github.com/MeridianOXC/OpenXcom/blob/oxce-plus/src/Battlescape/TileEngine.cpp#L1843

Even more if you do not like current version you can mod it using y-scripts.