RE: Problem: pf2.2 + Onyx2 + Layers

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JSC-ER7 (hadi.m.tjandrasa1++at++jsc.nasa.gov)
Thu, 5 Mar 1998 10:00:13 -0600

Changing far and near clipping planes may help eliminate runway markings
from flashing, try setting hither to 0.1.

Hadi Tjandrasa

> ----------
> From: Mattias.Johansson++at++saab.se[SMTP:Mattias.Johansson++at++saab.se]
> Sent: Thursday, March 05, 1998 8:06 AM
> To: info-performer++at++sgi.com
> Subject: Problem: pf2.2 + Onyx2 + Layers
>
> 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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