Re: clipmapping & multipipe

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Brian Furtaw (brian++at++sgi.com)
Wed, 13 Nov 1996 09:37:40 -0500

In the performer release notes section 4.1 of Know problems and workarounds,

 excerpt....

     4. Known Problems and Workarounds

       This chapter lists the problems with the IRIS Performer
       libraries, libpr and libpf, and with the shared memory
       configurations.

       4.1 General Issues

          o Clip-mapping currently does not support simultaneous
            rendering on multiple graphics pipelines. In
            particular, if you run perfly on a scene with clipmap
            texturing on a multipipe machine, you must specify the
            "-M0" option to keep it from trying to run on multiple
            pipes and consequently crashing or giving incorrect
            results.

....end-o-excerpt

Probably for the reasons you just mentioned.

Brian

On Nov 13, 8:58am, Waldron, Glenn wrote:
> Subject: clipmapping & multipipe
>
> One of the Performer 2.1 (?) readme files states that
> "clip textures only work in single-pipe applications".
> Obviously there can only be one clip texture centre, but
> that shouldn't matter since in most (of my) multipipe apps,
> all pipes share the same eyepoint (with orientation
> offsets). Therefore all pipes would share the same image
> cache, and the only bottleneck I can think of is downloading
> from the image cache to multiple texture memories. Would
> this be too much of a bottleneck or does Performer just not
> support it? (Note I don't have an iR handy so I haven't
> actually tried it..)
>
> Thanks a lot, and apologies if this is already been
> discussed. Glenn.
> --
> Glenn Waldron, ANSER Leading Edge Technologies, 703.416.8462
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
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>-- End of excerpt from Waldron, Glenn

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