Warp <war### [at] tagpovrayorg> wrote:
>   Post-clipped antialiasing causes problems in a multitude of images
> very frequently. You only have to have a surface which is much brighter
> than 1 and a sharp edge adjacent to a dimmer surface (which is quite
> a common situation) to get ugly pixelation of the edge. Pixels much
> brighter than 1 are completely normal, not modelling flaws.
>   Just look at The Kitchen image carefully to see the ugly post-clipping
> artifacts (these were not taken into account in judging because it
> was decided that these artifacts can be got ridden of in future
> versions of POV-Ray).

Thank you.  That explains something I saw and thought was some sort of a bug
involving 3.6 and blobs (since that's where I happened to see the problem
in my case.)  Aparently, though, it's caused by post-clipped antialiasing,
since the problem occurs at a place where reflections and specularity
combine to get very bright pixels.  I tried upping max_trace_level,
cranking anti-alias down to 0 -- finally decided to just use the picture I
made with 3.5.

Dave Matthews

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