Re: Texture problems

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Christoph Brandt (brandt++at++hni.uni-paderborn.de)
Tue, 12 May 1998 09:07:35 +0200

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> On May 11, 12:08pm, Jarrett Coffman wrote:
> > Subject: Texture problems
> > We have 3 Indigo2 MAX IMPACT machines, and on 2 of the 3 machines we are
> > having trouble displaying textures. Grayscale textures look pinkish or
> > distorted. We tried upgrading one of the "bad" machines from 2.0.4 to
> > 2.2 and had the same problem.
> >
> > We think that it might be either an X server or OpenGL bug. When we run
> > the program over the network and display it on another machine (O2) the
> > textures look good.
> >
> > Anyone run across this before?
>
> I have heard of exactly this when High Impact machines were upgraded to Max
> Impact machines incorrectly. A Max Impact is essentially 2 High Impact pipes in
> parallel ( parallel GEs and TRAM ) so the TRAM is duplicated internally. In
> short a Max Impact with 4M TRAM actually has 2 X 4TRAM inside ( more texture
> throughput rather than capacity ). If a High gets upgraded to Max but only has
> one set of TRAM then this effect happens.
>
> If it's not that then you could just have a dodgy TRAM board, even though it's
> 2 machines with the same problem it might be the same/similar HW problem on
> both, one test would be to pull swap the system disk from a good machien to a
> bad machine, if the problem follows the disk ( which I doubt ) then it's SW, if
> the problem stays with the HW then I suggest you log a HW support call.
>
> Cheers
> Rob

We had the same problem on an Octane MXI system. After exchanging the
TRAM the effect was gone.

Christoph

--
Christoph Brandt                Tel. ++49 +5251 60-6233
Virtual Reality Group           Fax. ++49 +5251 60-6268
Rechnerintegrierte Produktion   http://wwwhni.uni-paderborn.de/rip
Heinz Nixdorf Institut          Fuerstenallee 11 
Universitaet GH Paderborn       D-33102 Paderborn
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