Problem: pf2.2 + Onyx2 + Layers

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Mattias.Johansson++at++saab.se
Thu, 05 Mar 1998 15:06:35 +0100

Hi,

We have a flight sim app with a large MultiGen database.
This app normally runs on an 3 pipe Onyx IR w. pf2.1

I'm trying to move the app to an Onyx2 with pf2.2.
I can't seem to get the same quality with layers on the new
machine.

Depending on pfDecal mode, we either get z-fighting (runway markings)
or polygons rising to the sky (lakes).

Unfortunately we use large sub faces to make outlines
of lakes on top of a generic satellite image. The lakes
are sort of floating up in the air when using the
default layering algorithm. This effect is much much more
noticeable on the new machine (read: distracting).

We use 23bits depth buffer and the same values for FOV and
near/farclip on the two machines.

Anyone got any suggestions as to what the source of the problem might
be?
Hardware, Performer release, graphics rollup, Multigen .... ????

Machine info: Onyx2, one RM7, graphics rollup #4 (2789)

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Mattias Johansson                          Email:
Mattias.Johansson++at++saab.se
Systems Engineer                           Phone: +46 (0)13 - 181740
Saab Aerospace - Simulation Center         Fax  : +46 (0)13 - 184177
581 88 Linkoping - Sweden
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