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I'm busy converting an old scene from Megapov 0.6 to Pov 3.5 and I've
noticed that the caustics from the photons are much dimmer in 3.5. I tried
decreasing the spacing in the photons block, but that just brightened the
crystal
without having much effect on the caustics.
How had the photon implementation changed in 3.5?
Any suggestions as to how I could get the caustics brighter without
messing up the rest of the scene
Abbreviated scene code in p.t.s-f
Thanks
Gail
--
#macro G(H,S)disc{0z.4pigment{onion color_map{[0rgb<sin(H/pi)cos(S/pi)*(H<6)
cos(S/pi)*(H>6)>*18][.4rgb 0]}}translate<H-5S-3,9>}#end G(3,5)G(2,5.5)G(1,5)
G(.6,4)G(.5,3)G(.6,2)G(1,1)G(2,.5)G(3,.7)G(3.2,1.6)G(3.1,2.5)G(2.2,2.5)G(9,5
)G(8,5.5)G(7,5)G(7,4)G(7.7,3.3)G(8.3,2.7)G(9,2)G(9,1)G(8,.5)G(7,1)//GS
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Attachments:
Download 'Magic31.jpg' (24 KB)
Download 'Magic35.jpg' (21 KB)
Preview of image 'Magic31.jpg'
Preview of image 'Magic35.jpg'
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Gail Shaw wrote:
>
> How had the photon implementation changed in 3.5?
There was a bug fix regarding photons and normals which
affects photons brightness. Try adding little (1.0001) dispersion.
There's still a bug which makes photons brighter when more than the
default number of samples are used :)
_____________
Kari Kivisalo
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"Kari Kivisalo" <ray### [at] engineer com> wrote in message
news:3C84A677.46BD0E90@engineer.com...
> Gail Shaw wrote:
> >
> > How had the photon implementation changed in 3.5?
>
> There was a bug fix regarding photons and normals which
> affects photons brightness. Try adding little (1.0001) dispersion.
> There's still a bug which makes photons brighter when more than the
> default number of samples are used :)
>
Currently dispersion on the crystal is set to 1.05, dispersion samples to 17
Gail
--
#macro G(H,S)disc{0z.4pigment{onion color_map{[0rgb<sin(H/pi)cos(S/pi)*(H<6)
cos(S/pi)*(H>6)>*18][.4rgb 0]}}translate<H-5S-3,9>}#end G(3,5)G(2,5.5)G(1,5)
G(.6,4)G(.5,3)G(.6,2)G(1,1)G(2,.5)G(3,.7)G(3.2,1.6)G(3.1,2.5)G(2.2,2.5)G(9,5
)G(8,5.5)G(7,5)G(7,4)G(7.7,3.3)G(8.3,2.7)G(9,2)G(9,1)G(8,.5)G(7,1)//GS
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From: Christoph Hormann
Subject: Re: Photons in Mega0.6 and Pov 3.5 (50kbu)
Date: 5 Mar 2002 07:09:24
Message: <3C84B55A.D6C662A6@gmx.de>
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Gail Shaw wrote:
>
> [...]
>
> Currently dispersion on the crystal is set to 1.05, dispersion samples to 17
>
And how about without dispersion?
I remember there was a serios bug with dispersion and photons, but i'm not
sure if it's fixed meanwhile.
Christoph
--
POV-Ray tutorials, IsoWood include,
TransSkin and more: http://www.tu-bs.de/~y0013390/
Last updated 21 Feb. 2002 _____./\/^>_*_<^\/\.______
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"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3C84B55A.D6C662A6@gmx.de...
>
> And how about without dispersion?
>
> I remember there was a serios bug with dispersion and photons, but i'm not
> sure if it's fixed meanwhile.
>
I'll try that when I get home.
Thanks
Gail
--
#macro G(H,S)disc{0z.4pigment{onion color_map{[0rgb<sin(H/pi)cos(S/pi)*(H<6)
cos(S/pi)*(H>6)>*18][.4rgb 0]}}translate<H-5S-3,9>}#end G(3,5)G(2,5.5)G(1,5)
G(.6,4)G(.5,3)G(.6,2)G(1,1)G(2,.5)G(3,.7)G(3.2,1.6)G(3.1,2.5)G(2.2,2.5)G(9,5
)G(8,5.5)G(7,5)G(7,4)G(7.7,3.3)G(8.3,2.7)G(9,2)G(9,1)G(8,.5)G(7,1)//GS
Post a reply to this message
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"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3C84B55A.D6C662A6@gmx.de...
>
> And how about without dispersion?
>
> I remember there was a serios bug with dispersion and photons, but i'm not
> sure if it's fixed meanwhile.
>
That's fixed it. Thanks very much
Gail
--
#macro G(H,S)disc{0z.4pigment{onion color_map{[0rgb<sin(H/pi)cos(S/pi)*(H<6)
cos(S/pi)*(H>6)>*18][.4rgb 0]}}translate<H-5S-3,9>}#end G(3,5)G(2,5.5)G(1,5)
G(.6,4)G(.5,3)G(.6,2)G(1,1)G(2,.5)G(3,.7)G(3.2,1.6)G(3.1,2.5)G(2.2,2.5)G(9,5
)G(8,5.5)G(7,5)G(7,4)G(7.7,3.3)G(8.3,2.7)G(9,2)G(9,1)G(8,.5)G(7,1)//GS
Post a reply to this message
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From: Christoph Hormann
Subject: Re: Photons in Mega0.6 and Pov 3.5 (50kbu)
Date: 5 Mar 2002 08:58:43
Message: <3C84CE88.28528319@gmx.de>
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Gail Shaw wrote:
>
> That's fixed it. Thanks very much
>
Just FYI, it's:
* dispersion_samples affects photon brightness (job000193)
(higher dispersion_samples also gives brighter refractive photons)
Reported in:
Bug: dispersion_samples affects photon brightness
http://news.povray.org/MPG.1631c5fca936293298969e@news.povray.org
Christoph
--
POV-Ray tutorials, IsoWood include,
TransSkin and more: http://www.tu-bs.de/~y0013390/
Last updated 21 Feb. 2002 _____./\/^>_*_<^\/\.______
Post a reply to this message
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Christoph Hormann wrote in message <3C84CE88.28528319@gmx.de>...
>
>Just FYI, it's:
>
>* dispersion_samples affects photon brightness (job000193)
> (higher dispersion_samples also gives brighter refractive photons)
> Reported in:
>Bug: dispersion_samples affects photon brightness
>http://news.povray.org/MPG.1631c5fca936293298969e@news.povray.org
I saw that, not sure if it's the same thing. I had dispersion samples higher
than the default
(using 17, default is 7) and the caustics were much dimmer than without
dispersion.
I'll experiment some more tomorrow.
Gail
*************************************************************************
* gai### [at] mwebcoza * Chaos, disorder and panic *
* http://www.rucus.ru.ac.za/~gail/ * My job here is done. *
*************************************************************************
* Just think of me as the storm before the calm Magic: The Gathering*
*************************************************************************
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