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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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