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Ambient Occlusion "Shadow Line"Follow

#1 Sep 10 2010 at 11:00 AM Rating: Decent
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Hi, I am using a Radeon HD 5870 with 10.8 drivers. With Ambient Occlusion turned on, in addition to low FPS (low 20's) and what appears to be graphical lag (the game feels like it stalls for half a second and lunges forwards...hard to describe), I get a large "shadow line" as depicted below. It begins in the upper left-hand corner and extends towards the middle of the screen where it fades out.

http://img.photobucket.com/albums/v129/lufia22/FFXIV/ffxivgame2010-09-1011-53-24-05.jpg

I had a similar issue in All Points Bulletin, though I never linked the cause to Ambient Occlusion, and the line was almost unnoticeable.

There was another topic here comparing AO off and on. He mentioned the right side of his screen being darker due to an ATI bug with AO, but the screenshot he linked didn't show any noticeable shadow line.

Is this an ATI only problem? Also, is it only ATI cards that run badly with AO turned on? I have seen several Nvidia users claim that AO hardly effects their performance, whereas it impacts mine a great deal. Even Nvidia users with lower specs are claiming to be using AO just fine. Of course, they provide no proof and if there's anything I've learned over the years it's to not trust what people say about their PC performance, but I'm not going to totally right them off. I'm more inclined to believe them, considering I keep seeing more and more people with Nvidia cards claiming to be running fine.

Any input?

Edited, Sep 10th 2010 1:02pm by TheLufia
#2 Sep 10 2010 at 11:08 AM Rating: Default
its a problem with certain ati cards. users recommend just turning AO off. its a game bug
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#3 Sep 10 2010 at 11:10 AM Rating: Good
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The AO they're using doesn't make a big enough difference to bother having it on anyway. I was able to play with it on without too much frame rate drop, and it still wasn't worth keeping.
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#4 Sep 10 2010 at 11:33 AM Rating: Good
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Quote:
The AO they're using doesn't make a big enough difference to bother having it on anyway. I was able to play with it on without too much frame rate drop, and it still wasn't worth keeping.


Pretty much this. Doesn't make an fps difference, at least not a noticeable one, unless I drop to my single card config and roll into an aetheryte camp. Then it seems to eat up maybe, 7-12 fps depending on the crowd?

And the benefits, or lackthereof, are extremely minute compared to say, the AO in some other games, like Age of Conan. So, you're not missing out on much atm. Oddly enough, I also now share that half screen shadow that you, and others have demonstrated in pics. Seems to be due to a patch though as it wasn't there for me the first few days of OB. Weird. :P

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#5 Sep 10 2010 at 11:37 AM Rating: Decent
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Any idea why my FPS drop so much, though? In that screenshot, I was gettin 23 FPS at that moment. Typically, in that same area, I get 60 FPS with AO turned off. I'm using an HIS 1GB 5870.
#6 Sep 10 2010 at 11:40 AM Rating: Good
That's just how AO works when its not optimized and poorly coded in. Some other games are like this too but this is the worst hit I've seen from using AO.

The worst hit from enabling shadows is by far in Borderlands (removed 30-40fps from your score no matter what, and this is well known but never fixed in the game).

Developers need to code better mkay :)
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