The reason trees don't normally get AA'ed is because they're alpha (transparency) textures. Sorta like the old 2D sprites that used to be in FPS games like Doom or Duke 3D in a way.The normal multisampling AA modes of today's video cards work by AA'ing only the edges of 3D polygons that have volume. Since the trees (clouds too) are essentially a series of invisible 2D surfaces with a texture applied to them, (this is why they look like thin crosses from straight above them) the card won't AA them.Supersampling AA doesn't have this limitation, but it comes with a performance hit. I personally think the hit is worth enabling the 8xS mode on my 7800GTX, because it mostly gets rid of all the shimmering.For the two types of cards, here's how to AA these objects:Nvidia 7 and 8 series:1. Transparency AA - there's a setting that attempts to just AA transparency textures. While it works fine in most games, I see no difference between having it on and off in the FS engine. For this reason I use:2. Supersampling AA - the 8xS setting is under Combined on the AA tab in nHancer, and what it technically does is apply a 4X multisample AA to the polygons and then a 2X supersample algorithm to the entire scene. There's a bit of an FPS hit from it, but like I said, I find it far superior to having tons of shimmering with a few more FPS.ATI X1000 and 2900 series:ATI as far as I know only has one mode - Adaptive AA. There's two settings for this, Quality and Performance, try both and see if the shimmering gets better. I don't believe ATI has a full scene supersampling mode like Nvidia does.

For me, clamping negative lod bias with nhancer did far more to get rid of shimmering - nipped it at the bud, so to speak. 8xs without clamped lod bias still has lots of shimmering but clampled lod bias without 8xs has slight shimmering. Although supersampling, as Ryan said, cleans up the image quality further.

Ryan,I would appreciate some help with nHancer. I couldn't find 'Combined' on the AA tab. Are my settings, shown below, correct in nHancer?http://forums.avsim.net/user_files/173148.jpghttp://forums.avsim.net/user_files/173149.jpgUlf BBFG 8800GTX

That doesn't look like Version 2.2.3. Get the latest version. But you are running a combined mode - look at the box1x2 SS + 4x MS. SS=SuperSampling. MS= MultiSampling. You have both, combined.Allcott

Thanks Allcot :-)Yes it's version 2.2.3, but on install I choose to remove all SLI-profiles, so maybe the that alters the GUI in some way.http://forums.avsim.net/user_files/173184.jpgUlf B