Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Tue, 13 Aug 1996 09:47:24 +0100
Thanks,
Angus.
On Aug 12, 2:46pm, Marcus Barnes wrote:
> Subject: Re: Flimmering
> On Aug 5, 11:07am, Jude Anthony wrote:
> > Subject: Flimmering
> > I've got a model of a hotel with a parapet. The parapet is made out
> > of quads, and it has triangular polygons of a different color on top
> > to represent windows. The windows are flimmering. (Not _my_ term;
> > found it in the Perfomer programming guide.)
> >
> > I've tried moving the windows away from the quads, I've changed the
> > "Rel Priority" field of the window's polygon attributes in MultiGen
> > to 100 (as compared to the quads' 0), and I've tried making each
> > window a subface of its quad, all without noticeable results.
>
> The subface approach is supported by the OpenFlight loader, but not the
> "relative Priority" approach. There have been bugs in the support for
> pfLayer/pfDecal in Performer 2.0, pfdBuilder and pfdLoadFile_flt. The
> Performer 2.0.2 patch from SGI fixes such problems. The only decaling
> mechanisim that always renders correctly is
> Unfortunately it is costly on RE2 (but not on iR). You can tell the
> OpenFlight loader to use this mode:
>
> % perfly -y flt,9,6 file.flt
>
> or:
>
> {
> pfdConverterMode ( "flt", PFFLT_LAYER, PFDECAL_BASE_STENCIL );
> pfdLoadFile ( "file.flt" );
> }
>
> > Do I have to triangulate everything before subfacing works, or is
> > there something else I should be doing here? I don't want to cut the
> > window out of the parapet, as that would increase my polygon count
> > unacceptably for this realtime application.
>
> Cutting out the subfaces can give good performance, especially on iR. Don't
> rule it out without doing a benchmark first. MultiGen has tools, to
> triangulate and cut out subfaces, that work pretty well.
>
> Regards.
> --
> ____ ___ ____ _ Marcus Barnes, Member Technical Staff
> / __ `__ \/ __ `( ) MultiGen Inc. 550 S. Winchester Blvd. STE 500
> / / / / / / /_/ / / San Jose CA 95128 WEB: http://www.multigen.com
> /_/ /_/ /_/\__, /_/ PH:1-408-556-2654 FX:1-408-261-4102
> /____/ EMAIL: marcus++at++multigen.com
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>-- End of excerpt from Marcus Barnes
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