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Just revisiting an effect I played with a long time ago. Sunrise simulated
by scattering blue media and a white light source. All the pretty colours
come from the blue air removing all the blue light from the sun so you end
up with just orange. The main difference between this and my earlier version
( http://evilsuperbrain.com/gallery/misc/index.php?movie=sun-a-rise ) is
that I'm using a colour matrix (thanks to megapov's post processing) to do
all the rendering in a CIE colour space, allowing for more vivid and
realistic colours. Also this one's media is type 5 with eccentricity .5, so
we get a nice glow near the sun.
I'm still working on the effect 'cause I'm not too happy with the colours...
but it took all night to render and I wanted to show it off!
--
Tek
http://evilsuperbrain.com
Post a reply to this message
Attachments:
Download 'CIEdawn000.m1v.mpg' (254 KB)
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Tek wrote:
>
> I'm still working on the effect 'cause I'm not too happy with the colours...
> but it took all night to render and I wanted to show it off!
>
Does look quite realistic to me, except maybe for some of
the green about 1/3 into the animation. Then again, i've
seen stranger colours in the sky ;)
-Markus
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That's amazing!
I've attempted to do the exact same thing (sunrise coloring via media),
but I've never been able to get it to look anywhere near as good as
yours does.
Out of curiosity, could you do some still frames at various clock
points, of different parts of the sky (ie, looking straight up, having
the sun behind you, etc). One of the problems I found was that, not
only was it hard to get the sunrise to look good, but the coloring of
the rest of the sky tended to go a bit wacko as well (depending on the
media type I used).
...Chambers
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very nice!
but I believe the sun is always the brightest part of the sky. In your
animation, when the sun is just above the mountains, the surrounding sky is
brighter than the sun.
cu!
--
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x) // ZK http://www.povplace.com
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Well the sun is behind the atmosphere, so theoretically it can't appear
darker than the sky (since you're seeing it through the sky). The effect is
actually caused by the colour space I'm doing my calculations in, the sun is
so bright that it effectively generates a negative blue component, making it
too yellow. Very strange!
--
Tek
http://evilsuperbrain.com
"Zeger Knaepen" <zeg### [at] povplace com> wrote in message
news:45bf71bf@news.povray.org...
> very nice!
> but I believe the sun is always the brightest part of the sky. In your
> animation, when the sun is just above the mountains, the surrounding sky
> is brighter than the sun.
>
> cu!
> --
> #macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
> sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
> #end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
> _(0x+y.5+y/2x)_(0x-y.5+y/2x) // ZK http://www.povplace.com
>
>
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"Tek" <tek### [at] evilsuperbraincom> wrote:
> Just revisiting an effect I played with a long time ago. Sunrise simulated
> by scattering blue media and a white light source. All the pretty colours
> come from the blue air removing all the blue light from the sun so you end
> up with just orange. The main difference between this and my earlier version
> ( http://evilsuperbrain.com/gallery/misc/index.php?movie=sun-a-rise ) is
> that I'm using a colour matrix (thanks to megapov's post processing) to do
> all the rendering in a CIE colour space, allowing for more vivid and
> realistic colours. Also this one's media is type 5 with eccentricity .5, so
> we get a nice glow near the sun.
>
> I'm still working on the effect 'cause I'm not too happy with the colours...
> but it took all night to render and I wanted to show it off!
[...]
Impressive! How long did this take to render? (Just curious.)
Some comments: the transition from the orange sun to the white sun seems
a bit unrealistic-looking. I'm not sure if it's just my perception... Also,
after the sun has risen, there remains a white glow over the horizon,
which looks odd.
Nevertheless, a very cool animation. Are you planning to use this as part of
a larger movie, perhaps? :-)
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Wow, this is clearly one of the coolest animations Ive seen here.
Great job... wow.
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