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Hi,
Does anyone know how to achieve this "halo" effect of a star being seen
behind a cloud and, I assume because of scattering, there is a bright ring
around the star? I have made the cloud a media object with scattering, but
I can't seem to get a nice "halo" around the star/light source.
Thanks for any suggestions.
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http://geocities.com/ccolefax/lenseffects.html
--
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
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Warp wrote:
>http://geocities.com/ccolefax/lenseffects.html
>
>#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
>-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
>
Nice...thanks a lot.
Just wondering, is there no "natural" way of getting these effects, like
from scattering of the light or photons in POVray?
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Some have tried, many have failed. The amount
of photons and the tracing depth for a sufficient
effect are just... well... high.
--
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
> Warp wrote:
> >http://geocities.com/ccolefax/lenseffects.html
> >
> >#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb
x]
> >-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// -
Warp -
> >
>
>
> Nice...thanks a lot.
> Just wondering, is there no "natural" way of getting these effects, like
> from scattering of the light or photons in POVray?
>
>
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.502 / Virus Database: 300 - Release Date: 18.07.2003
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In article <3f203d32@news.povray.org>, Warp <war### [at] tag povrayorg>
wrote:
> http://geocities.com/ccolefax/lenseffects.html
What Penners is looking for is actually produced by atmospheric
scattering, not a lens effect. Unfortunately, the scattering models used
in POV peak at an angle of 0 to the light, so you get a glow that's
brightest around the source and just falls off from there. The ice
crystals that cause this effect scatter light differently, peaking at 22
degrees. POV just doesn't have a scattering model that describes this
effect. Maybe the scattering intensity curve could be specified with a
user-defined function, this would give a great deal more flexibility.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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In article <cja### [at] netplexaussieorg>,
Christopher James Huff <cja### [at] earthlinknet> wrote:
> What Penners is looking for is actually produced by atmospheric
> scattering, not a lens effect. Unfortunately, the scattering models used
> in POV peak at an angle of 0 to the light, so you get a glow that's
> brightest around the source and just falls off from there. The ice
> crystals that cause this effect scatter light differently, peaking at 22
> degrees. POV just doesn't have a scattering model that describes this
> effect. Maybe the scattering intensity curve could be specified with a
> user-defined function, this would give a great deal more flexibility.
Here's some good pictures of the effect:
http://antwrp.gsfc.nasa.gov/apod/ap000515.html
http://antwrp.gsfc.nasa.gov/apod/ap020114.html
http://antwrp.gsfc.nasa.gov/apod/ap030321.html
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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Penners <pen### [at] hotmailcom> wrote in message
news:web.3f202a007a7870359478e7c60@news.povray.org...
> Hi,
> Does anyone know how to achieve this "halo" effect of a star being seen
> behind a cloud and, I assume because of scattering, there is a bright ring
> around the star? I have made the cloud a media object with scattering,
but
> I can't seem to get a nice "halo" around the star/light source.
>
> Thanks for any suggestions.
>
I think you can do that using a hollow sphere filled with scattering media
using a spherical color map with the middle transparent so color only shows
around the outside.
This isn't the same thing;
http://www.irtc.org/ftp/pub/stills/2003-06-30/lites_rg.jpg,
but while I was experimenting with the media for it I got something like
what you want. The code is here;
http://www.irtc.org/ftp/pub/stills/2003-06-30/lites_rg.zip
Look at the color map I used and play with it. You can either put it around
the star, or between the star and the clouds. Play with the placement, but
I think it should work.
RG
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Christopher James Huff <cja### [at] earthlinknet> wrote:
> Maybe the scattering intensity curve could be specified with a
> user-defined function, this would give a great deal more flexibility.
If you can use a fake which renders in 1 second and which looks as
good as the real thing... why bother?
--
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}// - Warp -
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"Warp" <war### [at] tagpovrayorg> wrote in message news:3f212305@news.povray.org...
>
> If you can use a fake which renders in 1 second and which looks as
> good as the real thing... why bother?
"Because" - moving to O.T.....
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Thanks everyone for all your help/suggestions. I really appreciate it.
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