Re: pfLayers & Flickering in 2.0

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Marcus Barnes (marcus++at++multigen.com)
Fri, 16 Feb 1996 15:00:52 -0800

On Feb 16, 1:16pm, Randall Barker wrote:
> Subject: pfLayers & Flickering in 2.0
> Ok, I have read the previous posts about loading .flt files and flickering.
 As
> it turns out, we are having the same problem. I could not tell from the
> previous posts if it was a problem in 2.0 or the loader.

The loader mode PFFLT_LAYER does work correctly. I just tested it using the
Performer 2.0MR /usr/sbin/perfly_igl and got correct values and the expected
results.

> I have tried every PFDECAL_* with pfdConverterMode_flt and none of them
> seem to do any thing. I even called pfdGetConverterMode_flt before
> loading the model to check that the Mode was correct. I tried to use
> pfdCombineLayers() after every thing was loaded. Still nothing. I have
> run on both an Indigo2 and an Onyx and both have really bad flickering.
> When I look at the database in perfly, it looks fine.

I have tested both executables, /usr/sbin/perfly_igl and /usr/sbin/perfly_ogl,
on my Indigo2 XZ with 5.3 and patches 183, 258, 342, 358, 420, 450, 453, 526,
and 541 among others. The IRIS GL version behaves very badly as you describe,
when using _FAST or _DISPLACE modes. Quality varies greatly as a function of
the near/far clipping planse and also the position/orientation of the layer'd
geometry wrt the eyepoint. Conversely, the OpenGL version behaves quite well
given the same circumstances.

> The application is something we have just ported from 1.2 and there was no
> flicker in the 1.2 version. Are some additional settings that now need to be
> made in 2.0?

Try using OpenGL and see if that makes a difference. I get correct results
with IRIS GL and _STENCIL mode. Both of these choices will reduce performance
on an ONYX RE2 ... unfortunately.

Regards.

--
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