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Subject: Re: Bkg Anti-aliasing
In-reply-to: Your message of Fri, 19 Aug 94 23:51:23 -0700.              <[e-mail]>
Date: Mon, 22 Aug 94 15:29:23 EDT
From: Mark Thompson <[e-mail]>
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[e-mail] writes:
> >decreasing the shading rate on motion blurred objects :-)
>         ^^^^^^^^^^^^
>     Mark, what is the technical definition of "shading rate"?

Shading rate is the frequency at which shading calculations are made for
a surface. In LightWave and most other renderers, the shading rate is
essentially the same as the sampling rate. For every pixel (or sub-pxel)
that a geometry calculation takes place, there is an associated shading
calculation. However, this need not be true as in the case of Renderman
where the two rates are handled independantly. By decreasing the shading
rate of a motion blurred object, you would still be calculating the geometry
to a fine degree, but the heavily blurred surface color would be sampled
far less frequently. Potentially, you could decrease the sampling frequency
as well, but this may generate artifacts. Perhaps Kevin B could comment
on any experience he may have with reduced sampling rates on motion blurred
objects.
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