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Anyone know if foliage actually provides any useful coverage against enemy visibility? I sure have a hard time seeing anyone through bushes, but the enemy seems to have absolutely no trouble seeing, and shooting, me through it.
This question / problem has been solved by Decaneimage
Haha. When I read your thread I thought this was in general discussion and I was thinking "Is this question being asked based upon reality?"

Anyway, I would have to say no, the AI will see it through which is a bummer, they shouldn't have advantages like that but what you could do is save beforehand and then keep experimenting on how easy it is for the AI to spot you then we feel safe you understand how it works you continue to play as usual.
As i remember from using Ultimate mod (where you can choose a lush green zone or a dried up one without leaves), the foliage reduces accuracy of enemy fire a great deal, but is not good cover on the whole. This is in cases of a firefight. If they haven't already seen you however, then foliage should increase your chances of remaining undetected in line of sight.
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The maximum texture transparency through which an NPC is unable to see is given by the 'transparency_threshold' parameter in config(s)\creatures\m_stalker.ltx. This value is 0.4 for all three STALKER games. This means that foliage would need to be at most 0.4 'units' transparent for an enemy to fail to see through it. But the foliage in all three games is of a much higher nominal transparency than this. In Clear Sky, e.g., it is 0.7 'units' for swamp reeds. This means that enemies will see you through such foliage just as well as if there were no foliage at all. This is true even where multiple textures are layered behind one another -- the opacity of the textures is not additive.

In short: foliage makes for non-existent cover in all three stalker games, unless you mod 'transparency_threshold' to a higher value. (But if you do do this, then enemies will be completely blind to you so long as your whole body is behind a bush, even if the bush has fully transparent places through which the enemy should be able to see you -- oh, that's another thing: the opacity of foliage is uniform throughout the entire texture.)
Post edited February 13, 2014 by Decane
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Decane: In short: foliage makes for non-existent cover in all three stalker games, unless you mod 'transparency_threshold' to a higher value.
I have a hard time believing this as I occasionally use bushes for cover (in SoC that is). That enemies do indeed lose track of me is pretty much officially confirmed by the attention meter going down when I do this, not to mention the enemies' behaviour that I observe. Of course it doesn't work with all foliage but for instance the area in the Dark Valley near the exit to the Garbage has numerous huge bushes that perfectly hinder the enemies' visibility.

I mean, I believe that your facts about the transparency system are correct but I think there's far more opaque foliage in the game than you'd think.
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ekj7: Anyone know if foliage actually provides any useful coverage against enemy visibility? I sure have a hard time seeing anyone through bushes, but the enemy seems to have absolutely no trouble seeing, and shooting, me through it.
Seeing and shooting are two different things. Enemies frequently shoot at locations where they last saw you (even when you disappear behind a solid wall) but they shouldn't actually see you through the more dense foliage. Watch the attention meter to see what works as cover and what doesn't.
Post edited February 13, 2014 by F4LL0UT
As an example, at the very beginning of the game, the car park full of bandits: sneak around the left side and as you come up between the buildings, there's a large tree/bush there. If there's a bandit at the entrance of the building on the right, he sees me through the tree and I'm shot dead before I can ever see him.