POV-Ray : Newsgroups : povray.unofficial.patches : Photons and max_gradient : Re: Photons and max_gradient Server Time
6 Oct 2024 12:04:59 EDT (-0400)
  Re: Photons and max_gradient  
From: Tom Melly
Date: 13 Jul 2001 09:26:39
Message: <3b4ef70f$1@news.povray.org>
"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3B4EE977.2FEC87C0@gmx.de...
>
> You can add an optional 3 component vector to 'eval' for adaptation to
> special situations, see the Megapov docu section 5.2.7. for a detailed
> description.
>

Yes, I read that. Couldn't make head nor tail of it ;)

I'll stick with my tried-and-tested method.

Run with eval
Set max_gradient to eval output
Run with eval again
Check eval output hasn't gone up (sometimes does).

The whole business confuses me though - if eval "knows" what the true
max_gradient should have been, why didn't it just use it in the first place?
Okay, presumably it can only "know" the max_gradient after the event, but how?
Without using a higher max_gradient, how can it know what value to predict?

Oh, well. Sesame Street is on tomorrow morning. Hopefully it will be the letter
R, the number 12, and iso-surfaces....


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