Hello Christian,
On 03/10/2011 08:41 AM, Christian Bar wrote:
> Hello everyone!
> I am using OpenSG 1.8 release in a cluster environment under winXP 32/64
> bit or Seven 64 bit.
do you use the 1.8 release or a more recent CVS checkout? I'd highly
recommend using a CVS checkout as there have been many fixes since 1.8
was released - not sure if any of them would help with the problem you
are running into... ;)
> The machines use nVidia Quadro graphic cards (Quadro FX 4600), and I
> also use HP laptops with Quadro FX 1500M and Quadro FX 2800M
>
> When I update my graphic driver of my workstations, I notice some
> strange behaviour:
>
> - stereoscopy do not work well anymore (it seems that it works "in
> reverse" to normal)
hmm, I assume you are referring to quad buffer stereo here since you are
using Quadro cards and you are saying the eyes are now reversed? Can you
perhaps describe your OpenSG setup for stereo rendering a bit, what
camera decorators are you using for example?
> - particle systems / billboards now slow down the frame rate when
> updating camera position and only when using a cluster configuration
> (MultiDisplayWindow). FPS drops from 20 to 5... I know that there should
> be a little drop in framerate (due to viewer quads calculus) when
> updating the billboards, but with the old drivers the drop wasn't so
> much big!
>
> If I use a very old nVidia driver release (97.77 WinXP 32 bit) these
> issues do not happen, and if I install a new driver release (I tried
> more than one, obviously) these oddness happen again.
> For Win7 machines I cannot revert to such old drivers, because they do
> not exist...
>
> Could it be some OpenSG error with OpenGL new versions?
hmm, the only thing that I could imagine is that the relevant code hits
some emulated/slow path in modern drivers. I'm not sure what to do about
this though, rewriting the particles (especially for 1.x) is not
something I'll be able to tackle any time soon unfortunately.
Cheers,
Carsten
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