the problem may have to do with the drivers supplied by your card
maker.  sometimes, card-specific drivers aren't as good as nvidia's. 
that's one reason why some card makers win awards and good reviews while
others that use the same chipset don't.  all geforce cards aren't
created equal even though the chips are.  i'd look into drivers if i
were you.  see if your card maker has a new one and also grab nvidia's
reference driver.  try out one and then the other and see which works
best for you.

Thomas de Groot wrote:
> 
> Hi all!
> I am not sure if this message is correctly posted in this particular ng.
> However, as Moray3.3 now supports OpenGL, and as I suppose that many Moray
> users also use Leveller, this might be of interest here.
> The problem is this:
> The 3D view of Leveller always worked fine until I used it on a new PC with
> a NVidia GeForce2 video card. This now shows ugly jaggies whenever I use a
> visible water level .
> I discussed the problem with Ray Gardener, the maker of Leveller, and he
> told me it "looks like a classic case of low OpenGL Z-buffer precision".
> After some extra trials, he came with an intriguing answer where the video
> card might be involved:
> Quote:
> "Hmm... the nVidia card is interesting. My system where I work at EA has an
> nVidia GeForce and it exhibits some unusual intermittent problems with
> Leveller. I don't know if it's the video card, but the problems don't occur
> on other systems, and they're also rendering related. While flying, the
> sampling rate can suddenly change to 64 x 64. I suspect the render settings
> are getting corrupted, and in your case it's the backplace distance instead
> of the sampling rate (same root problem, but different symptoms)."
> 
> Does anyone have the same experiences?
> Does anyone have a bright idea about this?
> Ray Gardener and I would be extremely interested indeed!
> 
> Sincere excuses for the somewhat lengthy mail, but difficult to shorten...
> 
> Thanks!
> 
> Thomas

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