POV-Ray : Newsgroups : povray.binaries.animations : Re: Caustics Server Time
19 Jul 2024 23:22:11 EDT (-0400)
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From: Christoph Hormann
Subject: Re: Caustics
Date: 24 Nov 2001 16:27:45
Message: <3C0010D1.3FE409C@gmx.de>
Jide wrote:
> 
> Was playing with Cristoph Hormanns water function.
> Went for the height_field approach to save time too.
> A bit of tweaking here and there + photons.

Nice, how many waves did you use?

> Rendertime for 100 frames was a bit over 1 and half
> hours.

Heightfield generated in POV?  How long did it parse per frame?

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/


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From: Jide
Subject: Re: Caustics
Date: 24 Nov 2001 17:05:01
Message: <3c00198d@news.povray.org>
Christoph Hormann wrote
> Jide wrote:
> >
> > Was playing with Cristoph Hormanns water function.
> > Went for the height_field approach to save time too.
> > A bit of tweaking here and there + photons.
>
> Nice, how many waves did you use?

Only 40. With more waves the function multiplier has to be
changed because Pov seems to kind of 'wrap' the output to [0,1]
and as much I liked tampering with the settings I'd be easier if
I knew the possible max/min values of the function for different
numbers of waves. I'm propably not making any sense ?

> > Rendertime for 100 frames was a bit over 1 and half
> > hours.
>
> Heightfield generated in POV?  How long did it parse per frame?

I can get the statistics only for the 7 first frames from the rerun dialog
and the times are between 12.0 and 12.7 seconds (Athlong 1.4 GHz).
And that's for 512*512 hf so not too bad.

-Jide


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From: JRG
Subject: Re: Caustics
Date: 24 Nov 2001 17:05:28
Message: <3c0019a8@news.povray.org>
Jide
> Was playing with Cristoph Hormanns water function.
> Went for the height_field approach to save time too.
> A bit of tweaking here and there + photons.
> Rendertime for 100 frames was a bit over 1 and half
> hours.
Too fast. Now add scattering media. ;-)

--
Jonathan.


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From: Jide
Subject: Re: Caustics
Date: 25 Nov 2001 08:27:16
Message: <3c00f1b4@news.povray.org>
JRG wrote
> Now add scattering media. ;-)

I've been trying it with scattering media but I can't
get visible light beams :(

-Jide


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From: JRG
Subject: Re: Caustics
Date: 25 Nov 2001 11:25:40
Message: <3c011b84@news.povray.org>
Try media 100 in the global_settings photons block.

"Jide" <jid### [at] kotisoonfi> ha scritto nel messaggio
news:3c00f1b4@news.povray.org...
>
> JRG wrote
> > Now add scattering media. ;-)
>
> I've been trying it with scattering media but I can't
> get visible light beams :(
>
> -Jide
>
>


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From: Jide
Subject: Re: Caustics
Date: 26 Nov 2001 12:26:23
Message: <3c027b3f$1@news.povray.org>
JRG wrote
> Try media 100 in the global_settings photons block.
>

Had it in there already.

-Jide


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From: Slime
Subject: Re: Caustics
Date: 26 Nov 2001 13:18:57
Message: <3c028791$1@news.povray.org>
> JRG wrote
> > Try media 100 in the global_settings photons block.
> >
>
> Had it in there already.
>
> -Jide

Also be sure to put

photons {
   target
   refraction on
   reflection on //off?
}

in the height field. Oh... you may also have problems if the height field
doesn't go all the way "down" to the bottom of the container. You'll need a
plane at the top of the water or something.

But there's a bug with media photons. I've mentioned it a few times, but it
doesn't seem to get on the known bugs list... they make the media too
bright, somehow. (If you encounter this bug too, *please* post it in the
beta group, and i'll confirm it for you, so they'll put it on the list...)

(I wish they'd fix it, because I've got this *awesome* picture that I can
finish once they do.)

- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]


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From: JRG
Subject: Re: Caustics
Date: 26 Nov 2001 13:46:11
Message: <3c028df3@news.povray.org>
Have you put hollow inside the heightfield block?

--
Jonathan.


"Jide" <jid### [at] kotisoonfi> ha scritto nel messaggio
news:3c027b3f$1@news.povray.org...
>
> JRG wrote
> > Try media 100 in the global_settings photons block.
> >
>
> Had it in there already.
>
> -Jide
>
>


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From: JRG
Subject: Re: Caustics
Date: 26 Nov 2001 13:48:29
Message: <3c028e7d@news.povray.org>
Slime wrote:
> (I wish they'd fix it, because I've got this *awesome* picture that I can
> finish once they do.)

...which explains why they don't intend to fix it... ;)

--
Jonathan.


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From: Jide
Subject: Re: Caustics
Date: 26 Nov 2001 17:20:34
Message: <3c02c032@news.povray.org>
JRG wrote
> Have you put hollow inside the heightfield block?

Yep. I think I have remembered everything. Here's the
relevant code conserning mdeia and photons.

global_settings {
  photons {
    spacing 0.0075
    jitter 0.5
    media 100
  }
}

#declare M_Watx =
material {
  yadda yadda
  media {
    method 3
    samples 5,5
    intervals 1
    scattering { 2, rgb <0.1,0.18,0.2> }
    collect on
  }
}

height_field {
    yadda yadda
    hollow
    material { M_Watx }
  photons {
    target
    reflection off
    refraction on
    collect off  // I suspected this might be it but I doesn't seem to
matter
  }
}

-Jide


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