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Read my notes first before clicking on the link below because some things in the guide linked need to be altered
First if you have anti-aliasing turned on through the ini tweak erase that line or put it to = 0, then set the in-game AA to low if you do not do this you may have issues with some spell effects like lightning not showing up and hologram characters might be missing.
On page 2 of the guide it has you set one of the settings to ENHANCE the correct setting for this is OVERRIDE any application settings
At the top section you should see an option for Antialiasing Compatability this needs to be set for 0x0000F0C1 it says (S.T.A.L.K.E.R - Call of Pripyat, S.T.A.L.K.E.R - Clear Sky, S.T.A.L.K.E.R - Shadow of Chernobyl) in the drop down menu for that option
now depending on your rig you can set this up how you like for better quality graphics. I run a sli 560 ti setup with a 2600k cpu running at 4.7Ghz
My settings are
********EDIT*********** recently switched to these new settings and found it looks about the same and is less taxing on my gpus since you aren't using SSAA but MSAA instead. Still testing new settings though.. I also can run high shadows with these settings and maintain my 40-60fps here' a good writeup of SGSSAA ************
Antialiasing - Setting = 4X MSAA
Antialiasing - Transparency = 4x Sparse Grid
I also turn shadows off usually because no matter what you cannot anti-alias the shadows in this game so they look like crap no matter hwat and just take up valuable resources. With shadows off I can maintain 60fps most of the time with these settings and my setup.. Also with shadows off turning the shader complexity to low nets you an extra 5 or so FPS
for people with super rigs like multiple gtx 580's or better try
Antialiasing - Setting = 8xQ
Antialiasing - Transparency = 8x Sparse Grid
now for people with good but not great systems set
Antialiasing - Setting = 2x Msaa
Antialiasing - Transparency = 2x SGSSAA
or if that's still to slow
Antialiasing - Setting = 4x MSAA
Antialiasing - Transparency = supersampling (can also try 4x or 2x supersampling)
people with even lower end systems can try
Antialiasing - Setting = 4x MSAA
Antialiasing - Transparency = OFF
Antialiasing - Transparency Multisampling = enabled
ok so now here is the original guide but its out of date so follow the instructions I provided using the guide as a visual representation also it has the download link for nvidia inspector
dont forgot to set antialiasing behavior flags to NONE!
any questions or issues let me know ill try and help
heres some example shots... now of course this does not make high res textures or anything but really helps the overall look of the game
for those interested in enabling FXAA look around and get the 295.18 driver series. This is a beta driver not avaialble yet from nvidias site but its not hard to find around the net. Now with this driver simply go into your Nvidia Control Panel and go to the 3d settings. There you will see a new option FXAA!. Now just enable this global and it will be on for anygame that supports it. Also this works fine in conjunction with my guide and nvidia inspector
Final Note: play around see what works best for you and let me know.. I'm always switching between differn't combos of AA and TrSSAA trying to find what works best for my system. You many also find certain objects edges will shimmer or have jaggies no matter how high your settings are just must be an issue with the engine itself.
EDIT note on blurring from sgssaa. To fix this look at nvidia inspector and you will see an option under texture filtering that says Negative LOD Bias make sure this is set to allow. Then above that LOD Bias(DX9) set this to at least -2 for 4x for 2x -1 works.. more negative LOD bias is the sharper it will make textures but it will adder shimmering of textures ot distances.. so play around and find what works best. Some should have no issues with 4x or 8x sgssaa and maxing out the LOD at -3...