POV-Ray : Newsgroups : povray.advanced-users : Lightning : Re: Lightning Server Time
26 Jun 2024 22:13:42 EDT (-0400)
  Re: Lightning  
From: MichaelJF
Date: 20 Oct 2013 11:55:01
Message: <web.5263fbabb67aff75850a064a0@news.povray.org>
"MichaelJF" <mi-### [at] t-onlinede> wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
> >
> >
> > I am curious to see what you can achieve. I have not tested Rune's code
> > in a lightning setting. Maybe it is not good for that. If time allows, I
> > shall have a few experiments.
> >
> > Thomas
>
> May be I will use them as a comparison later. First I will test the other
> approach. If you will try the sample files be sure to add assumed_gamma 1 to the
> scene. Without I saw nearly nothing.
>
> Michael

Meanwhile I have implemented the first stage to construct a "leading" bolt (in
2D). The approach is very slow but first results looked promising. But now I
have to find a work around to compensate for the very high epsilon POV uses.
With a 64bit machine 1.69851e-013 is not zero, but POV treats it so. POV-eps
seems to be somewhere at 1.0e-5 or 1.0e-6 which is unacceptable completely
nowadays. I and others have experienced problems with this historical setting in
the past. Most likely one only has to change a constant within a header file but
no one dares to do so. And the problem is known...

Sorry, I'm a little bit frustrated having lost a days work due to this issue.
Take it serious but not too serious ;-) May be there more dependencies I cannot
judge.

Best regards,
Michael


Post a reply to this message

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.