In article <3ffd9fea@news.povray.org>,
 "Gilles Tran" <tra### [at] inapginrafr> wrote:

> >But you should notice that with +a0.0 POV-Ray supersamples every pixel
> >while i am pretty sure C4D does not.
> 
> In fact, I was suprised to see POV-Ray crawl on a plain background{} with
> a0.0, which doesn't make much sense. C4D slows down there a little bit only,
> but it's a sky_sphere here so it's an object. With a0.0 on a real background
> (like a complex texture on a plane), both applications crawl, and not only
> with aa0.0...

a0.0 means supersample even if the color difference is 0...it makes the 
antialiasing entirely non-adaptive. A perfect black background will be 
as slow as a highly busy granite texture. Maybe POV supersamples if 
difference >= AA-threshold, while C4D supersamples if difference > 
AA-threshold.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

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