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Yet another clouds picture.
I'm using a df3 with scattering and absorbing media against a Skylight
#include background. I wrote a program to generate df3 files using
Perlin noise applied to a stack of ellipsoids. It turned out quite
nice.
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Attachments:
Download 'df3.jpg' (12 KB)
Preview of image 'df3.jpg'
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What was the render time?
- Slime
[ http://www.slimeland.com/ ]
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Hi
df3 clouds are rendered rather fast.
If you want to experiment, have a look at Gilles Tran's MakeCloud new
macros.
http://www.oyonale.com/ressources/english/sources13.htm
They don't create df3 files the same way than Andrew's but the principles
are the same.
Marc
3ec07585@news.povray.org...
> What was the render time?
>
> - Slime
> [ http://www.slimeland.com/ ]
>
>
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"Slime" <slm### [at] slimeland com> wrote in message
news:3ec07585@news.povray.org...
> What was the render time?
As Marc Jacquier quite rightly says, they render fast. This was chopped
out of a 1280x960 A0.3 render that took 45 minutes on my Athlon 2GHz. I
used intervals 3 in the media and used interpolation on the df3.
I was inspired to do this by Gilles Tran's clouds macros, which showed
me how fast df3s render - I'd never experimented with media properly
before. Right now I have to work on optimising my Perlin functions
(they would win prizes for inefficient coding right now) - then I might
give an animation a go.
Andrew
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Very nice. Realistic and fluffy.
Aaron
"Andrew" <ast### [at] hotmailcom> wrote in message
news:3ec049e1@news.povray.org...
> Yet another clouds picture.
>
> I'm using a df3 with scattering and absorbing media against a Skylight
> #include background. I wrote a program to generate df3 files using
> Perlin noise applied to a stack of ellipsoids. It turned out quite
> nice.
>
>
>
Post a reply to this message
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3ec0bd80@news.povray.org...
> "Slime" <slm### [at] slimelandcom> wrote in message
> news:3ec07585@news.povray.org...
> > What was the render time?
>
> I was inspired to do this by Gilles Tran's clouds macros, which showed
> me how fast df3s render - I'd never experimented with media properly
> before.
Nor did I :-/
> Right now I have to work on optimising my Perlin functions
> (they would win prizes for inefficient coding right now) - then I might
> give an animation a go.
I look forward :-)
>
Marc
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Impressive...
Bet yet can't make big black storm clouds though ;-)
(They have a charicteristic "anvil" shape; it would be hard to get that out
of a random number generator...)
Andrew.
(This is where someone goes and proves me totally wrong ;-)
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> I look forward :-)
Because your eyes are at the front of your head :-)
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D'oh
I was wondering... :-)
Marc
3ec15fce@news.povray.org...
> > I look forward :-)
> Because your eyes are at the front of your head :-)
>
>
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"Andrew Coppin" <orp### [at] btinternetcom> wrote:
> (They have a charicteristic "anvil" shape; it would be hard to get that
out
> of a random number generator...)
>
> (This is where someone goes and proves me totally wrong ;-)
I won't prove it, but I'll offer a mechanism for somebody else to prove
it...
All you would need to do is this (pseudo-code, of course):
z = rand(minheight,maxheight)
min = min = hammer_min_width( z );
max = max = hammer_max_width( z );
x = rand(min,max)
y = rand(min,max)
Where:
rand(min,max) returns a pseudorandom number between min and max
hammer_min_width( z ) returns the minimum size of the cloud's cross
section at elevation z
hammer_max_width( z ) returns the maximum size of the cloud's cross
section at elevation z
Granted, this would yield a group of objects that would have a square
sillhouette if viewed from above, but that could easily be solved by using a
slightly different equation for x & y, e.g., x = rand( min , max ); y^2 =
x^2 - 1;
--
-- Early Ehlinger CEO, ResPower Inc - Toll-Free : 866-737-7697
-- www.respower.com -- 500+ GHz Supercomputer Starting At USD$0.50/GHz*Hour
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