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From: Tim Nikias v2 0
Subject: Re: LJ-gas-simulation [980 KB MPEG1 4s / 25 fps 640x512]
Date: 9 Apr 2003 10:15:27
Message: <3e942aff@news.povray.org>
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If you could explain a little more in detail
what it is supposed to do, that would be helpful.
Is it some algorithm with which I could calculate
the movement of smoke or fire (due to the way hot
particles move), or am I on the wrong track?
Whats the parsing time (render time shouldn't
be that high with this setup, obviously :-)?
--
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmx de
> Hi!
> Well, that's an illustration for an simulation with Lennard Jones
> Potential and leapfrog algorithm. The visible effect could be reached
> with much less overhead, I guess, but I actually wanted to *see* it! The
> gas particles are the boxes, one corner of each box shows in the
> movement direction and the color indicates the speed of the particle.
> I simulated with the Fortran Program some macroscopical parameters such
> as temperatur, pressure and so on. I also verified the law of Diffusion.
> If anyone is interested I can mail you the high quality version (7MB
> DIVX or MPEG1 30s / 25 fps 1280x1024).
> Regards,
> Florian
>
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From: Florian Pesth
Subject: Re: LJ-gas-simulation [980 KB MPEG1 4s / 25 fps 640x512]
Date: 9 Apr 2003 11:01:49
Message: <3e9435dd@news.povray.org>
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Tim Nikias v2.0 wrote:
> If you could explain a little more in detail
> what it is supposed to do, that would be helpful.
> Is it some algorithm with which I could calculate
> the movement of smoke or fire (due to the way hot
> particles move), or am I on the wrong track?
The algorithm itself is very general. You may have heard of the Verlet
Algorithm from which the leapfrog algorithm is a variant. Basically it's
a numerical integration method like the Euler Algorithm, but it has some
advantages over the Euler algorithm. The energy conservation is better
and the algorithm runs stable in the other direction.
Such programs can be used for very complex simulations for molecular
dynamics. There is a great interest for such simulations in the
industrie, especially the chemical industrie. With enough effort you
should be able to model smoke or fire physical accurate, but it may not
be suited for animation purposes because of speed. Actually I think a
"fake" could be suited much better.
My animation can't show really, what the program is capable of, but I
thought it would be nice for a presentation. Note, that the program
calculates the distances of the particles with periodical walls, but the
particles itself move freely in the room. There is a cut radius, so that
forces from far particles are not calculated.
You may have a look at the group page for more general information on
molecular dynamics (german):
http://constanze.materials.uni-wuppertal.de
>
> Whats the parsing time (render time shouldn't
> be that high with this setup, obviously :-)?
>
I can't remember the parsing time, but the whole time for one picture
(1280x1024) was 27s. I thought about using focal blur, but didn't had
the patience ;-).
Florian
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From: Florian Pesth
Subject: Re: LJ-gas-simulation [980 KB MPEG1 4s / 25 fps 640x512]
Date: 9 Apr 2003 11:03:50
Message: <3e943656@news.povray.org>
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Florian Pesth wrote:
> http://constanze.materials.uni-wuppertal.de
Oh, I just noticed, there is also an english version:
http://constanze.materials.uni-wuppertal.de/Englishindex.html
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From: Sir Charles W Shults III
Subject: Re: LJ-gas-simulation [980 KB MPEG1 4s / 25 fps 640x512]
Date: 9 Apr 2003 11:27:50
Message: <3e943bf6$1@news.povray.org>
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"Florian Pesth" <fpe### [at] compuservede> wrote in message
news:3e9435dd@news.povray.org...
<snip>
> My animation can't show really, what the program is capable of, but I
> thought it would be nice for a presentation. Note, that the program
> calculates the distances of the particles with periodical walls, but the
> particles itself move freely in the room. There is a cut radius, so that
> forces from far particles are not calculated.
That would be similar to the DeBye shielding distance in electrons, it would
seem. The averages of all the distant, weak forces are more or less noise at
that point.
Cheers!
Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip
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From: Hugo Asm
Subject: Re: LJ-gas-simulation [980 KB MPEG1 4s / 25 fps 640x512]
Date: 9 Apr 2003 11:31:41
Message: <3e943cdd$1@news.povray.org>
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As far as I know, MPEG1 doesn't support resolutions more than 384x288 ! ?
Hugo
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From: Florian Pesth
Subject: Re: LJ-gas-simulation [980 KB MPEG1 4s / 25 fps 640x512]
Date: 9 Apr 2003 11:35:30
Message: <3e943dc2@news.povray.org>
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Exactly!
Florian
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From: Florian Pesth
Subject: Re: LJ-gas-simulation [980 KB MPEG1 4s / 25 fps 640x512]
Date: 9 Apr 2003 11:38:09
Message: <3e943e61@news.povray.org>
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Hugo Asm wrote:
> As far as I know, MPEG1 doesn't support resolutions more than 384x288 ! ?
Let's say, I told the encoder (transcode) to produce an mpeg1 with
640x512 and he didn't complain. I don't know the specifications of the
format. I hope you can all see it!
Florian
>
>
> Hugo
>
>
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