Re: Casting shadows with pfLightSource and OpenGL

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Bernard Leclerc (bleclerc++at++cae.ca)
Fri, 3 May 1996 11:58:01 -0400

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?

--
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     /        / |       /	Systems Engineer	voice: +1 514 341 2000
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