Hmm, I reduced the blur samples to 32, but increased the area lights to 5x5 
arrays (adaptive 2) with similar other modifications along the lines Jerome 
used. I was going to run it tonight at 1280x1024, but I may wait now that I 
see your results. (Athlon XP 3000+)

- Grim


news:41c88e67@news.povray.org...
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> Mike Raiford wrote:
> | Render-time thus far: 2d:23h:25m
> |
> | Its slow. Very slow. Painfully slow. But, darnit, it looks sooo
> cool... :)
> |
> After a bit of fiddling with your code, I've just finished rendering
> a 800x600 version of this image. It took 11h39m on my Athlon XP
> 2700+, so I think it should take around 1 day at 1152x864.
>
> Here are my optimizations:
> - - I reduced the number of focal blur samples from 128 to 64. This is
> the only questionable change I made, but it's not the biggest time
> saver anyway. The results look aren't too bad at 800x600, it might be
> worth a couple of tests without the media ball to see what happens at
> higher resolutions;
>
> - - I tweaked the media parameters for the ball:
> + for both medias, I reduced the sample count to 4, I increased the
> aa_level from the default (4) to 6 and I decreased the aa_threshold
> from the default (0.1) to 0.001;
> + with high density medias like these, only a thin layer near the
> surface actually does something. The rest is black but POV wastes
> time sampling it anyway (there is no easy way for POV to know that
> the time is wasted). To circumvent this, I've added another sphere
> inside yours with a slightly lower radius (0.95) and a plain white
> pigment. This forces POV to take all its samples where they are
> needed and prevents it from wasting time with the black inside;
>
> - - I removed the pretrace_end radiosity option and went with the
> default settings. In fact for such a scene where the background is
> pure black and the main object is media based, radiosity is pretty
> useless and could probably be removed without changing the visual result.
>
> The sphere in my image is darker than yours and has a slightly
> reddish-brown color. This is not due to the parameter changes as a
> quick try with your media settings (but lower res and no focal blur)
> gives the same result. I think it comes from the fact that I used
> MegaPov 0.7 instead of whichever version you're using.
>
> The result is here:
> http://jeberger.free.fr/tmp/test.jpg
>
> Jerome
>
> - --
> ******************************
> *      Jerome M. Berger      *
> * mailto:jbe### [at] ifrancecom *
> *  http://jeberger.free.fr/  *
> ******************************
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