xKoweKx,
you didnt see it in mods yet, because its rare issue, and it only happens with clear sky swamp map in soc. The easy way for it was to set the view distance and fog distance in weather files to low, something like 200meter or max 300meter, so this way engine could run the map. BUT this didnt work with LA, even if we reduced view distance below 200meter, which looks ugly anyway, so we had to find an other way.
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The problem was more complex. Stalker soc engine was written in 2002-2003, when it was not possible to make high detailed lands, because the compilers could not compile the map due to high memory usage and 32bit windows stuff... so they set the engine memory buffer to something like 1mbyte. This 1mb was still enough for soc maps in 2006-2007, because gsc simplified the maps, less objects, less trees, but those trees and objects were high quality. So the outcome (amount of vertexes) was still similar as it was in 2002-3. (what i mean is: maps in 2003-4 had lots of objects, great size, but all of the objects were low quality, while in 2005-6-7 the maps became smaller, had less objects, but those objects were much better quality)
Just a little comparsion to understand. In soc the pripyat level had around 700.000 static and 400.000 mu vertexes (mu is for trees and other lod ojbects). In lost alpha pripyat has 1.200.000 static, and 3.000.000 mu vertexes, which simply overflow the engine capabilities... because engine can not display more than 1.5million vertexes at once on the screen. And if you count it, la pripyat has 4.2million of that. Engine has no problem with static lightning, but it halted on dynamic due to the lots of realtime processes, but we found a hack, raised the internal cache, and this allows lost alpha to run on full dynamic lightning without any problems. However there are some drawbacks. the bulbs on the lights not visible, and r2_use_r1_light command needs to be turned on, which needs lots of pc power, but if its turned off, light is not visible at all on r2.
So thats the story of FDL mode in LA. A few months ago we decided to cut off the FDL mode from LA, because it simply ddint work, and we wanted to avoid such posts as "hey, the game is crashing <the log which atikabubu pasted in a few comments ago> and what to do?". Thank god, a few days ago we found the way, and that saved FDL
I hope this helped a bit to understand what our problem was