Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Tue, 7 May 1996 21:10:30 +0100
On May 3, 11:58am, Bernard Leclerc wrote:
> Subject: Re: Casting shadows with pfLightSource and OpenGL
> On May 2, 6:08pm, Simon Hui wrote:
>
> > > It's because Performer does not currently have support for the
> > > OpenGL equivalents of the IrisGL filters TX_BILINEAR_LEQUAL and
> > > TX_BILINEAR_GEQUAL, which are used in conjunction with projective
> > > textures to produce shadow effects.
> >
> > I forgot to mention that, although there is no support in Performer
> > for shadows, you _can_ do shadows directly with OpenGL on Infinite
> > Reality. Try 'man glTexParameteri' and look for GL_TEXTURE_COMPARE_SGIX
> > and GL_TEXTURE_COMPARE_OPERATOR_SGIX.
>
> Simon,
>
> The question is: can these OpenGL features be used in a real-time
application?
>
> Even if OpenGL allows shadows to be created and rendered, can this be done at
> 30 Hz on the Infinite Reality?
>
> --
> ___/ | ___/ Bernard Leclerc e-mail: bleclerc++at++cae.ca
> / / | / Systems Engineer voice: +1 514 341 2000
> / / | __/ CAE Electronics Ltd. extension 2275
> / / | / 8585 Cote De Liesse fax: +1 514
340 5496
> / ____ | / P.O. Box 1800
> _____/ _/ _| _____/ Saint-Laurent, Quebec, Canada, H4L-4X4
>-- End of excerpt from Bernard Leclerc
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