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"nemesis" <nam### [at] gmail com> schreef in bericht
news:web.4953f734619c0ff3180057960@news.povray.org...
> Speaking of rainbows, I spotted this natural render yesterday.
> Unfortunately,
> my cheap digital camera wasn't up for the splendor. :P
And Natural POV renders so much faster :-)
This is a nice example by the way.
>
> My father told it was a sure bet to find a gold pot at its end, which
> looked to
> be in reach for the people in those houses in the far right, a place
> coincidentally named "Eldorado"... :D
Oooh, the lucky guys!
Thomas
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Among other things, Florian Siegmund saw fit to write:
> Another scene, another rainbow...
That's grat!
I seem to remember that, in addition to the two main full-spectrum bands,
there are some green-red stripes at one end... Do you simulate this too?
--
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby
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I think what you are seeing is the noise component of the isosurface.
"Eero Ahonen" <aer### [at] removethiszbxtnetinvalid> wrote in message
news:49540108@news.povray.org...
> Florian Siegmund wrote:
>
> How do you make the "overall" (I don't see it in the sky) noise in both
> of your pics? It makes them look like they were taken with a digital
> camera in just a little bit too dark to be clean.
>
> -Aero
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"Thomas de Groot" <tDOTdegroot@interDOTnlANOTHERDOTnet> wrote:
> "nemesis" <nam### [at] gmailcom> schreef in bericht
> news:web.4953f734619c0ff3180057960@news.povray.org...
> > Speaking of rainbows, I spotted this natural render yesterday.
> > Unfortunately,
> > my cheap digital camera wasn't up for the splendor. :P
>
> And Natural POV renders so much faster :-)
No doubt! It even handled all those different trees with no need for single
mesh instancing! :D
> This is a nice example by the way.
Perhaps, but doesn't really show what we witnessed here. It was crisp bright
and colorful, but only faint at best in the photograph... quite a sighting!
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Jellby <me### [at] privacynet> wrote:
> That's grat!
>
> I seem to remember that, in addition to the two main full-spectrum bands,
> there are some green-red stripes at one end... Do you simulate this too?
>
> --
I found a photograph which I guess is spotting the additional color stripes (a
so called 'supernumerary rainbow') that you mentioned. And no, my include file
doesn't simulate those, beacause in this picture, the contrast was increased
artificially. So you will never see this phenomenon in nature with your own
eyes. That's the simply reason why I left them out :)
Post a reply to this message
Attachments:
Download 'rb_high_contrast.jpg' (88 KB)
Preview of image 'rb_high_contrast.jpg'
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I have to correct myself... It's NOT impossible that you can see this in nature
with your own eyes, but you hardly will ;)
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"nemesis" <nam### [at] gmailcom> wrote:
> My father told it was a sure bet to find a gold pot at its end, which looked to
> be in reach for the people in those houses in the far right, a place
> coincidentally named "Eldorado"... :D
As my brother was giving me a ride last week, a brilliant rainbow appeared with
the end of the rainbow planted directly on our destination. My brother said
that it was a sure bet to find a pot of gold at the OTHER end of the rainbow.
Those leprechauns are tricky guys.
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"Cousin Ricky" <ric### [at] yahoocom> wrote:
> As my brother was giving me a ride last week, a brilliant rainbow appeared with
> the end of the rainbow planted directly on our destination. My brother said
> that it was a sure bet to find a pot of gold at the OTHER end of the rainbow.
> Those leprechauns are tricky guys.
Yeah, but at least it should prove easy to ride the rainbow back to the other
side. XD
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"nemesis" <nam### [at] gmailcom> schreef in bericht
news:web.4955b41a619c0ff3180057960@news.povray.org...
> "Cousin Ricky" <ric### [at] yahoocom> wrote:
>> As my brother was giving me a ride last week, a brilliant rainbow
>> appeared with
>> the end of the rainbow planted directly on our destination. My brother
>> said
>> that it was a sure bet to find a pot of gold at the OTHER end of the
>> rainbow.
>> Those leprechauns are tricky guys.
>
> Yeah, but at least it should prove easy to ride the rainbow back to the
> other
> side. XD
>
Dangerous to do. What if the rainbow disappears once you are half way
through...?
Thomas
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Among other things, Florian Siegmund saw fit to write:
> I found a photograph which I guess is spotting the additional color
> stripes (a so called 'supernumerary rainbow') that you mentioned. And no,
> my include file doesn't simulate those, beacause in this picture, the
> contrast was increased artificially. So you will never see this phenomenon
> in nature with your own eyes. That's the simply reason why I left them out
> :)
Yes, I found that in Wikipedia shortly after posting ;)
However, it says that "the very existence of supernumerary rainbows was
historically a first indication of the wave nature of light, and the first
explanation was provided by Thomas Young in 1804." I doubt they had
contrast-enhanced photographs in 1804...
I have an article (in the Spanish version of Scientific American) about
theories of the rainbow, and it talks about the supernumerary rainbow as a
visible effect (though faint, rare, and more prominent at the top of the
arc, where the drops are smaller). It also mentions the failure of Newton's
theory to explain this supernumerary rainbow as a serious flaw.
P.S. The original article seems to be: "The Theory of the Rainbow", by H.
Moyses Nussenzweig (Scientific American, 236, 116-127, 1977).
--
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby
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