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2048 x 1536
3 days on a 800 mHz Duron
Post a reply to this message
Attachments:
Download 'CSGsaphyr.jpg' (46 KB)
Preview of image 'CSGsaphyr.jpg'
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Sylvax wrote:
>
> 2048 x 1536
>
> 3 days on a 800 mHz Duron
>
Sounds fairly slow for without photons, dispersion seems a bit unnaturally
high, what value did you use?
BTW, Povray 3.5 will have ior and colors for sapphire and other minerals
defined in the standard include files.
Christoph
--
Christoph Hormann <chr### [at] gmx de>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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3B8BE104.266CDA51@gmx.de...
>
>
> Sylvax wrote:
> >
> > 2048 x 1536
> >
> > 3 days on a 800 mHz Duron
> >
>
> Sounds fairly slow for without photons, dispersion seems a bit unnaturally
> high, what value did you use?
>
interior
{
ior 2.4
dispersion 1.70
disp_nelems 10
}
I tried photons mapping... I gave up quickly!
> BTW, Povray 3.5 will have ior and colors for sapphire and other minerals
> defined in the standard include files.
good news. I am a newbee with pov and it seems to me very difficult to
simulate mineral looking.
>
> Christoph
>
> --
> Christoph Hormann <chr### [at] gmxde>
> IsoWood include, radiosity tutorial, TransSkin and other
> things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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From an ior include file I found once (I forget where):
#declare Sapphire_IOR = (1.76 + 1.78) / 2; // A variety of Corundum
#declare Sapphire_IOR_Dispersion = 1.76 / 1.78;
As Chris stated, your dispersion is way too high, this number represents the
ratio of violet/red IORs for the material. (The numbers in the declare
above may be inverted. I can't remember anything from physics about
wavelengths and such. Anyone else?)
-tgq
"Sylvax" <syl### [at] darthsylvaxcom> wrote in message
news:3b8bea49@news.povray.org...
>
> 3B8BE104.266CDA51@gmx.de...
> >
> >
> > Sylvax wrote:
> > >
> > > 2048 x 1536
> > >
> > > 3 days on a 800 mHz Duron
> > >
> >
> > Sounds fairly slow for without photons, dispersion seems a bit
unnaturally
> > high, what value did you use?
> >
>
> interior
> {
> ior 2.4
> dispersion 1.70
> disp_nelems 10
>
> }
>
> I tried photons mapping... I gave up quickly!
>
>
> > BTW, Povray 3.5 will have ior and colors for sapphire and other minerals
> > defined in the standard include files.
>
> good news. I am a newbee with pov and it seems to me very difficult to
> simulate mineral looking.
>
>
> >
> > Christoph
> >
> > --
> > Christoph Hormann <chr### [at] gmxde>
> > IsoWood include, radiosity tutorial, TransSkin and other
> > things on: http://www.schunter.etc.tu-bs.de/~chris/
>
>
Post a reply to this message
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Sylvax wrote:
>
>
> interior
> {
> ior 2.4
> dispersion 1.70
> disp_nelems 10
>
> }
>
Both ior and dispersion are way too high for being realistic, ior should
be 1.7...1.8 and dispersion not more than 1.1 (probably even < 1.05).
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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Trevor Quayle wrote:
>
> From an ior include file I found once (I forget where):
>
> #declare Sapphire_IOR = (1.76 + 1.78) / 2; // A variety of Corundum
> #declare Sapphire_IOR_Dispersion = 1.76 / 1.78;
>
> As Chris stated, your dispersion is way too high, this number represents the
> ratio of violet/red IORs for the material. (The numbers in the declare
> above may be inverted. I can't remember anything from physics about
> wavelengths and such. Anyone else?)
>
The different ior's mentioned above are mainly due to anisotropy of
sapphire (like many other crystals)
Correct dispersion values can be calculated with:
http://www.luxpop.net/
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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Wow.. Now this is something I'd love to see in high resolution.
Do you have the hi-res image online somewhere?
--
Peter
http://hertel.no/peter
"Sylvax" <syl### [at] darthsylvaxcom> skrev i melding
news:3b8bc777@news.povray.org...
> 2048 x 1536
>
> 3 days on a 800 mHz Duron
>
>
>
Post a reply to this message
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Hello,
I hope to achieve my website (www.sylvax.net) in one month. Of course, this
picture will be there.
see you later,
sylvax
3b8c1622@news.povray.org...
> Wow.. Now this is something I'd love to see in high resolution.
> Do you have the hi-res image online somewhere?
>
> --
> Peter
> http://hertel.no/peter
>
> "Sylvax" <syl### [at] darthsylvaxcom> skrev i melding
> news:3b8bc777@news.povray.org...
> > 2048 x 1536
> >
> > 3 days on a 800 mHz Duron
> >
> >
> >
>
>
Post a reply to this message
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I will test your values. Thanks.
> Both ior and dispersion are way too high for being realistic, ior should
> be 1.7...1.8 and dispersion not more than 1.1 (probably even < 1.05).
>
> Christoph
>
> --
> Christoph Hormann <chr### [at] gmxde>
> IsoWood include, radiosity tutorial, TransSkin and other
> things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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