Nvidia or AMD AF Filtering broken? (was ATI 5870 AF filtering broken?)

Has anyone had time to compare IQ with LODs adjusted to produce the same filter quality on both NV and AMD? Until we know that there is a drop in IQ/detail when dialing down AMD's LOD to look like NV then all we know for sure is that NV uses a default lower LOD.

 

Not forgetting to measure performance in games with those adjustments made.

 

You guys should try some older drivers. It certainly fixed the texture filtering mip mapping issue that I found which caused extreme texture aliasing. Obviously 5xxx people can't go back to Cat 9.10 though.... I have no idea when this particular bug arrived. It also could be limited to XP or limited to older games.

 

I definately haven't. I did have an 8800GT before and I noticed no change in IQ.

I play heaps and don't notice.

Its just funny that theres all this talk about a significant visual problem that I haven't noticed. I was wondering if it really was a storm in a teacup or if it was just me.

 

Well you should know that the Internet takes minor differences and applies extreme tessellation factors.

 

I can see it with the trees in crysis esp on my side monitors. But its the only game i notice it in.

 

It is really, really terrible in some of the interior corridors in Star Trek Online. At least I think it's this bug, it may be a game bug...but halfway down many of the completely straight corridors, the textures become completely unrecognizable. It's a fixed distance away from the camera, so the line is always moving.

 

Some comparisons from The Witcher , Crysis , Guild Wars and GTA IV :
http://ht4u.net/reviews/2010/amd_radeon_hd_6800_reloaded/index11.php
http://www.forum-3dcenter.org/vbulletin/showthread.php?t=482069

 

If I had to guess, I'd say the app was setting the min filter to aniso but not the mag filter. I thought this was corrected in the driver already.

 

Cat 9.10 doesn't have the problem w/ NFS4 so it must be a new bug that came in sometime after that.

I'd hope that other people here would recognize missing mip mapping. I haven't seen the problem in other, more recent games but I'm not exactly playing a wide assortment.

 

I remember that somebody posted a link to a review showing quality impact of FP16 demotion, but I cannot find it now. Does anybody remember what site was it? Thanks

 

It was Damiens review, I think. But the differences to be observed in the shots were hardly worth noting, IMHO. Nevertheless, these things should not have happened behind everyone's backs.

 

now I recalled - it was atomic PC...

http://www.atomicmpc.com.au/Feature...and-degrading-game-quality-says-nvidia.aspx/6

thanks anyway

 

There's a discussion going on on Guru3D related to the 3D center's discovery. Doesn't seem like Nvidia has the same filtering quality as AMD in 3D centers shimmering tests (or perhaps differnt lod?):


http://forums.guru3d.com/showpost.php?p=3795668&postcount=166
original image from 3D center here:
http://www.3dcenter.org/image/view/3747/_original

and article from 3D center here (with google translate for convenience):
link

I'm surprised that 3D center didn't pick those differences up in their article. The banner is pretty evident, text being sharper on AMD.

 

Maybe because NVIDIA's image has been inverted (mirrored?) ?

 

Wouldn't alter sharpness, only direction.

(Look at the T and M which would be the same regardless of direction)

Edit:
I've mirrored the picture. AMD still have clearly sharper text.

 

there's definitely difference in detail (not only sharpness) and it's visible on the text a on the texture above it (green-grey shade)...

it's even more significant in slide-show

nVidia left / ATI right


ATI left / nVidia right


it seems, that lower shimmering on nVidia hardware (at least in this game) is caused by higher LOD values (less detailed textures)...

 

It seems so. Now I am curious if this is true with the other games they have tested for shimmering.

(The 5870 banding IS an issue, but I wonder how much the shimmering on the 6800 is releated to lod settings in profiles or similar)

 

I'm sorry for my eyes but... Hey, where do you see problems on AMD picture? The text on AMD side is more readable and everthing else about the same, a bit more blur on the nVidia side...

 

Exactly. The difference in sharpness can indicate a different lod settings between AMD and Nvidia.
The issue here is shimmering on AMD cards in this game, something that would happen if a negative lod is used also on Nvidia cards.