Much nicer (*applause*).  The effect is much more subtle, so I think it is a
lot more realistic this time around.  Would it be possible to have a few
more, and give it kind of a layered look (although with the techniques
you're using, that may put the rendering time through the roof)?  It looks a
lot better not to have the color quite as concentrated around the bottom
edge.  Good show.  Is this going to be part of some bigger scene, or was
your goal just to make northern lights?

Stephen Bell

"Gail Shaw" <gsh### [at] monotixcoza> wrote in message
news:3ac1ea75@news.povray.org...
> And version 3. It's amazing what a little
> turbulence does.
>
>
> I'm also working on a red and yellow aurora, but it doesn't
> look so good.
>
> Comments?
>
> Gail
> *************************************************************************
> * gsh### [at] monotixcoza                *   Step into the abyss,           *
> * http://www.rucus.ru.ac.za/~gail/   *   and let go.        Babylon 5   *
> *************************************************************************
> * The difficult we do immediately, the impossible takes a little longer *
> *************************************************************************
>
>
>

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> // ===== 1 ======= 3 ======= 3 ======= 4 ======= 5 ======= 6 =======
7 =
                     ^ How/What do you count ? ;-)

or do you simply avoid to write the "23" ...
(We're all afraid of the Illuminates *g)

--
background{rgb 1}camera{location<1,5,-2>look_at 0}#macro
m(a,b,i)#local d=(b-a)
/8;#local
e=vcross(d,y);#if(i)m(a-e,a+e+2*d,i-1)m(a+e,a+2*d-e,i-1)m(a+3*d-e,a+e
+3*d,i-1)m(a+3*d-e,a+5*d-e,i-1)m(a+6*d-e,a+e+6*d,i-1)m(a+8*d-e,a+e+8*d
,i-1)#else
cylinder{a,b,vlength(d)/3 pigment{rgb 0}}#end#end m(-4*x,2*x,4) // Jan
Walzer

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This looks very realistic.

I've seen Northern Lights about 4-5 times now; once on the ground in
Anchorage AK, once in the air, and twice in Upstate NY (dark skies).

Generally speaking, they are pale bands of color.  They don't show quite the
same way pictures do - I've often thought it's because the exposure has to
be timed to get it all, and as a result the pictures look more 'wavy' and
brighter in certain areas as the colors overlap.

So if I made any change, I'd make them fatter and don't overlap them too
much.

If you animate them however, you should know that they can 'rope' all over
the sky.  I never saw them fold over themselves much.

Interested in other's impressions though, it's been probably 25 years since
I saw the ones in Anchorage; the ones in Upstate NY were just 3 years ago
but were far less bright.  (which is odd, you're closer to the magnetic pole
in NY than in AK).

        == John ==

"Gail Shaw" <gsh### [at] monotixcoza> wrote in message
news:3ac1ea75@news.povray.org...
> And version 3. It's amazing what a little
> turbulence does.
>
>
> I'm also working on a red and yellow aurora, but it doesn't
> look so good.
>
> Comments?
>
> Gail
> *************************************************************************
> * gsh### [at] monotixcoza                *   Step into the abyss,           *
> * http://www.rucus.ru.ac.za/~gail/   *   and let go.        Babylon 5   *
> *************************************************************************
> * The difficult we do immediately, the impossible takes a little longer *
> *************************************************************************
>
>
>

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The green one looks pretty good now. =)

--
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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That looks like a julia fractal....

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Stephen Bell wrote:
> 
> Is this going to be part of some bigger scene, or was
> your goal just to make northern lights?
> 

Me smells an IRTC wip.

-- 
Francois Labreque | The surest sign of the existence of extra-
    flabreque     | terrestrial intelligence is that they never
        @         | bothered to come down here and visit us!
  videotron.ca    |                             - Calvin

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Francois Labreque <fla### [at] videotronca> wrote in message
news:3AC278FD.9752A47D@videotron.ca...
>
>
> Stephen Bell wrote:
> >
> > Is this going to be part of some bigger scene, or was
> > your goal just to make northern lights?
> >
>
> Me smells an IRTC wip.
>

You have a good nose (Although I said as much
in my first post)

Hopefully I'll be able to post a the whole scene
on monday.

Gail
*************************************************************************
* gsh### [at] monotixcoza                *   Step into the abyss,           *
* http://www.rucus.ru.ac.za/~gail/   *   and let go.        Babylon 5   *
*************************************************************************
* The difficult we do immediately, the impossible takes a little longer *
*************************************************************************

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Stephen Bell <ste### [at] yahoocom> wrote in message
news:3ac22b03$1@news.povray.org...
> Much nicer (*applause*).  The effect is much more subtle, so I think it is
a
> lot more realistic this time around.  Would it be possible to have a few
> more, and give it kind of a layered look (although with the techniques
> you're using, that may put the rendering time through the roof)?

Render time is currently about 15 min. That's on a PII 300 render priority
lower and lots of other stuff runing

> It looks a
> lot better not to have the color quite as concentrated around the bottom
> edge.  Good show.  Is this going to be part of some bigger scene, or was
> your goal just to make northern lights?
>

Going to be part of irtc entry (I hope)

Gail
*************************************************************************
* gsh### [at] monotixcoza                *   Step into the abyss,           *
* http://www.rucus.ru.ac.za/~gail/   *   and let go.        Babylon 5   *
*************************************************************************
* The difficult we do immediately, the impossible takes a little longer *
*************************************************************************

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Today's Astronomy Picture of the Day is some awesome aurora. 

http://antwrp.gsfc.nasa.gov/apod/astropix.html



-- 
Derek Stark
Linux Admin - eSN
dms### [at] esupportnowcom
xt 8952

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"D. Stark - eSN" <dms### [at] esupportnowcom> wrote in message
news:3AC32A66.14D83985@esupportnow.com...
> Today's Astronomy Picture of the Day is some awesome aurora.
>

... with a fractal like shape at the bottom of the pic.

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