Re: Mixing IrisGL code and Performer 2.1 ??

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Rémi Arnaud (remi++at++remi.engr.sgi.com)
Mon, 20 Oct 1997 10:57:47 -0700 (PDT)

Lionel Maiaux wrote:
>
> Allan Schaffer wrote:
> >
> > With that choice in mind, I'd strongly discourage writing any new
> > applications using IRIS GL. All of SGI's current systems (Impact,
> > Octane, O2, InfiniteReality) are OpenGL-based, and only emulate IRIS
> > GL via a software layer that can be pretty slow. You'll be much
> > better off with OpenGL.
> >
>
> And what about the RE2 and other IrisGL-based machines ?
>
> Are you sure that OpenGL on top of IrisGL has the same performance than
> direct IrisGL ?

 There was no IrisGL with 2.1 as 2.1 is intended only for IR, and
 IR is OpenGL based (IrisGL is slower and have less feature than OpenGL
 on IR, Onyx2, Octane, O2)
 On RE2, you want to use Performer 2.0, and may use IRISGL as it give you
 access to some features that the software OpenGL emmulation wont
 give you (spot lights, shadows ...). In a VisSim Application
 the limitation is very often the fill-rate (especialy on RE2)
 rather than the polygon rate, so you will not see any difference
 between OpenGL and IrisGL on Re2 for a fill limited vis-sim application.

 Note: coming Performer 2.2 is multiplatform, and support IrisGL and OpenGL.

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