G70 in texture shimmer hell? - tech
(hx) 01:49 AM CEST - Aug,27 2005
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have been a couple of articles that have cropped up on the web (thanks
Bit-Tech) that are discussing issues with poor filtering quality on NVIDIA's
GeForce 7 series video cards. An article on
ComputerBase (translation:
here) notes some irregularities in the texture filtering algorithm used in
the current drivers on GeForce 7800 GTX. These texture issues do appear to vary
from game to game and system to system, with some games appearing fine and some
clearly having issues There's also
a second article over on 3DCenter, which shows some comparison videos of the
shimmering - they're pretty large, but worth checking out if you want to
understand what is going on:
ATI, with its Radeon X800, shows: Even with activated "optimizations"
(meaning quality reduction), there are no shimmering textures. While there is no
full trilinear filtering used, this can not be noticed so quickly. Even though
ATI's texture filtering hardware does not compute as exactly as a GeForces', the
overall image quality is better, for there are not as many questionable
"optimizations." Angle dependency when using AF, however, should not be
considered as a feature of modern graphic cards any more, ATI's advertising
speaking of "High Definition" gaming can thus be seen as an unfulfilled promise
straight from the marketing department. At least, ATI shows that the scene in
the video does not have to include texture shimmering.
Nvidia, with its current 7800 series, offers graphic cards that can not
be recommended to lovers of texture quality–even though texel performance was
increased by a factor of 2.5 compared to the GeForce FX 5800 Ultra! Added to the
angle dependency (inspired by ATI's R300), there is now the tendency to texture
shimmering in addition. The GeForce 6800 (or GeForce 6600) has to be configured
to use "High Quality" to circumvent texture shimmering as much as possible. With
the 7800, this seems to be useless; even when using "High Quality", the new chip
tends to texture shimmering. The old Nvidia GeForce FX shows nearly perfect
textures, though.
What's going on? NVIDIA need to get the 80s out the door and fix this problem, quick!
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