Re: Casting shadows with pfLightSource and OpenGL

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Simon Hui (shui++at++kid.asd.sgi.com)
Thu, 02 May 96 18:08:27 -0700

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> From: Simon Hui <shui>
> Subject: Re: Casting shadows with pfLightSource and OpenGL
>
> 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

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