A user of my OSG app reported this week that a new computer system they acquired to do
realtime 3d landscape visualization is performing poorly. It is a laptop with a 256Mb ATI
chipset -- not sure exactly which variant. It has a CoreDuo CPU and widescreen display,
which should all be fine.
The program runs fine, but the visual quality of the texture is degraded. Here are two
shots from the same viewpoint, on the new machine (oglbadtexture.jpg) and an older desktop
machine with a (you guessed it) NVidia Quadro 3400 (oglgoodtexture.jpg). other desktop
machines also work fine.
http://3dnature.com/oglbadtexture.jpg
http://3dnature.com/oglgoodtexture.jpg
The "bad texture" grab is on a higher-res widescreen display, so it's hard to match
pixels for pixels exactly.
Something seems to be very wrong with the texture scaling. Has anyone seen anything
like this before? I imagine it must be some odd setting somewhere, but I'm at a loss to
speculate what, or fix it. In theory the new card should be just great for this, as it has
lots more memory than an older laptop, also using an ATI chipset (Radeon 9000) where it
works great. So, it's hard to imagine that it's a pathological failure in the ATI drivers.
If I figure it out, I'll post a follow-up.
--
Chris 'Xenon' Hanson aka Eric Hammil | http://www.3DNature.com/ eric at logrus
"I set the wheels in motion, turn up all the machines, activate the programs,
and run behind the scenes. I set the clouds in motion, turn up light and
sound,
activate the window, and watch the world go 'round." -Prime Mover, Rush.
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