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I am having the exact same problem. It started in Flotsam, and frankly, for a moment I thought my GPU was melting down, or the screen is finally broken. Glad to see it's not something I'm alone with.

My observations on the topic - this was absent in the prologue, and is entirely absent in the in-doors locations in Flotsam, so it has to do something with the area itself, and thus is likely a bug rather than a feature. I can post some screenshots as well, but the ones found here and in http://www.gog.com/en/forum/the_witcher_2/shadow_problem are pretty much exactly illustrating my issue.

I hope this is fixed soon, as it really gives a creepy feeling of my computer gradually breaking down and being about to burst into flames.
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angthoron: My observations on the topic - this was absent in the prologue, and is entirely absent in the in-doors locations in Flotsam, so it has to do something with the area itself, and thus is likely a bug rather than a feature.
Actually the screenshot I posted above is from the prologue - I haven't gotten very far yet because I spent a few hours figuring I had some setting wrong and trying to fix it.
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angthoron: My observations on the topic - this was absent in the prologue, and is entirely absent in the in-doors locations in Flotsam, so it has to do something with the area itself, and thus is likely a bug rather than a feature.
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Thecybermat: Actually the screenshot I posted above is from the prologue - I haven't gotten very far yet because I spent a few hours figuring I had some setting wrong and trying to fix it.
I can also confirm the problem is present in the prologue. It is a bit harder to notice because the area is so well lit.
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Thecybermat: Actually the screenshot I posted above is from the prologue - I haven't gotten very far yet because I spent a few hours figuring I had some setting wrong and trying to fix it.
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Fayth: I can also confirm the problem is present in the prologue. It is a bit harder to notice because the area is so well lit.
Oh, I see, I missed it there, but I guess it makes sense seeing as there's so much more shadow in Flotsam.
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Grunthex: Even with your 2 images, I just don't see anything that looks out of place. Certainly nothing gridlike.
I suggest you go to the optometrist.
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Thecybermat: For a game that otherwise looks so good, this is a huge annoyance. They really need to fix this, it's very distracting.

It only happens on areas of partial transparency.

It's especially bad with shadows on the ground:

http://i.imgur.com/evYVN.jpg

It actually looks worse than this, but since it gets converted to a jpg it is blurred a bit and looks better than it appears in-game.

It isn't the only way to do these either, so why they picked such a terrible way to do transparency I don't know. The only other game I've seen this bad is Just Cause 2. Pretty much every other game I checked does partial transparency and shadowing much better.
Same issue with me. I was running mostly on ultra with good framerates, changing the shadows from ultra to high helped a bit of not noticing as much of the pixalated shadows.
I'm pretty sure it's on purpose, as that's how the game is able to look as well as it does on current (especially lower end) hardware.

I personally don't have any problems and hardly notice it, but obviously some people can be annoyed by different things. :p
I've noticed it mainly on the shadows cast by trees, it's pretty bad. Rest of he game looks fantastic though.
I noticed a lot in the Flotsam area with all the shadows everywhere, and the surrounding area the shadows from trees and is more obvious on npc character faces. I try messing around with different settings and nothing makes a difference. Well at least my fps is stable.
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Alakar: I noticed a lot in the Flotsam area with all the shadows everywhere, and the surrounding area the shadows from trees and is more obvious on npc character faces. I try messing around with different settings and nothing makes a difference. Well at least my fps is stable.
Yup. Flotsam is definitely the worst for it.
As someone said i don't think it's a bug too. More related to "soft" engine programming so it doesn't hurt too much on the GPU.

Otherwise it could be great to add an option "uber shadow" so you can get something clean if you want to (and if your GPU can afford the performance cost).
Post edited May 24, 2011 by Paul-Hewson
dithering effect.

it's either grainy shadows or the more traditional pixelated blocky shadows. personally, i prefer this variety.
Post edited May 24, 2011 by soldiergeralt
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Paul-Hewson: As someone said i don't think it's a bug too. More related to "soft" engine programming so it doesn't hurt too much on the GPU.

Otherwise it could be great to add an option "uber shadow" so you can get something clean if you want to (and if your GPU can afford the performance cost).
But I can put all settings to ultra and the shadows are still grid like. It is actually extremely distracting in Flotsam.