OpenGL cards and multiple windows / WinNT

[Lisa S. Avila]

Hi John,

What do you mean by "the latest changes to the clipping planes in nightly
releases"?  The clipping range changes were made a couple of months ago -
is it something more recent that is causing you a problem?

The closest the near plane can come to the camera in the ResetClippingRange
method of vtkRenderer is 0.01 units in front of it. I suppose if the near
and far plane are very far apart (compared to a distance of 0.01) then
maybe there could be some truncation / round off problem occuring. Do you
always see this problem? Even when looking at just a simple sphere with a
radius of 1.0?

Lisa

At 01:59 PM 11/5/99 +0000, John Biddiscombe wrote:
>
>>Those using 3DLabs' VX1 seem to be a happy bunch, especially if they have
>>a second CPU to make use of the (non-beta) multi-threaded drivers.
>>
>>Now that the drivers for the TNT2/VX1 cards have matured, can anyone offer 
>>a comparison?  Will the GeForce/Quadra cards leave all else in their wake?
>
>I can't offer any input in this regard, but I can say
>
>"Stay clear of any product manufactured by Diamond"
>
>I'm using a FireGL 1 here at work and an older FireGL 1000 at home.
>
>I'm happy with the overall performance when using multiple windows (4,5,6
>etc etc), huge datasets (700,000 polys), large textures (11MB), and the
>whole lot is just lovely....
>
>except that clearly Diamond employ monkeys to write their drivers. Every
>simulation I run has problems with lighting/clipping etc etc The latest
>changes to the clipping planes in nightly releases have totally destroyed
>my stuff. I may have a lovely Z-buffer, but its bugger all use when the
>graphics card randomly clips away anything it likes irrespective of
>distance. Clearly there are floating point instabilites in the calculations
>done on the card to decide what to clip, chunks of screen flicker in and
>out of visibility, odd patches of repeating black spots flip in and out of
>view and generally it's just painful to view.
>
>I suspect that when the clipping planes get close to the camera, everything
>just dies and I have no idea why. 
>
>I'd very much like to be proven wrong and not blame diamond, but unless
>someone at Kitware wants to 'fess up and give some reason why vtk could be
>causing this - Then don't buy their cards!.
>
>John B
>
>
>
>
>
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