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How do I calculate the density of a particle field in some point in
space? Suppose that the positions of all particles are stored in an
array.
Peter Popov
ICQ: 15002700
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Calculate the distance from each particle, and use an equation like
1/distance^2(depending on what you want) for each particle, and add the
amount of contribution from each particle(not average). Getting the
distance and calculating is sometimes not much slower than skipping
particles beyond a certain distance, although that may help.
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Peter Popov wrote:
>
> How do I calculate the density of a particle field in some point in
> space? Suppose that the positions of all particles are stored in an
> array.
>
> Peter Popov
> ICQ: 15002700
Just for kicks you might take a look:
http://www.sbox.tu-graz.ac.at/home/a/ahi/particle-system.html
--
Ken Tyler
mailto://tylereng@pacbell.net
http://home.pacbell.net/tylereng/links.htm
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Tnanks Ken(I know, it wasn't me who you were answering). That link looks
helpful. Got any others on particle simulation?
Mr Popov: I am also making a particle simulator, and it is almost to the
point of building "superparticles" out of particles, like molecules out
of atoms. No competition for yours though, mine is written in C++.
(yours is written in POV, right?)
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Ken wrote:
>
> Peter Popov wrote:
> >
> > How do I calculate the density of a particle field in some point in
> > space? Suppose that the positions of all particles are stored in an
> > array.
> >
> > Peter Popov
> > ICQ: 15002700
>
> Just for kicks you might take a look:
> http://www.sbox.tu-graz.ac.at/home/a/ahi/particle-system.html
>
> --
> Ken Tyler
>
> mailto://tylereng@pacbell.net
> http://home.pacbell.net/tylereng/links.htm
Hi,
I have one question:
Any idea why the particles are converted to blobs by Andreas?
Just a point to add, Peter and I continue the mail/news-mixed
conversation:
Calculations like these can be done with octave.
http://www.che.wisc.edu/octave/
It's GPL (Peter, you can drop the price of Matlab) and a Matlab clone.
Nice features:
Vectorisation of almost any operation. You can do the integration of one
timestep for all particles at a time, for example.
Nice as well is the vectorized sprintf. It gives you a formatted output
as often as your input suffices. A one-liner just to convert all
particles to blobs.
So much hype is enough...
Axel
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Chris Huff wrote:
>
> Tnanks Ken(I know, it wasn't me who you were answering). That link looks
> helpful. Got any others on particle simulation?
> Mr Popov: I am also making a particle simulator, and it is almost to the
> point of building "superparticles" out of particles, like molecules out
> of atoms. No competition for yours though, mine is written in C++.
> (yours is written in POV, right?)
The fun, smart, bounce stretchy stuff page has some info on it I beleive:
http://freespace.virgin.net/hugo.elias/
Pual T. Bourk always has usefull info:
http://www.mhri.edu.au/~pdb/rendering/software.html
Colefax has an include file doesn't he ?
http://www.geocities.com/SiliconValley/Lakes/1434/
You might take a quick peek at Daniel Skarda's links page:
http://atrey.karlin.mff.cuni.cz/~0rfelyus/bookmark.html
Also see my links in the announcement group in the 3d resources section.
I recall more info available in those sites but I don't have time to
track them all down for you.
Luck,
--
Ken Tyler
mailto://tylereng@pacbell.net
http://home.pacbell.net/tylereng/links.htm
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>The fun, smart, bounce stretchy stuff page has some info on it I
beleive:<
Not enough, unfortunately. I have already scoured that one for info.
>Pual T. Bourk always has usefull info:<
Now that looks useful. I had seen one of his pages then lost it.
>You might take a quick peek at Daniel Skarda's links page:<
Another that I had lost.
Thanks!
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Chris Huff wrote:
> >Pual T. Bourk always has usefull info:<
> Now that looks useful. I had seen one of his pages then lost it.
See specificaly : http://www.mhri.edu.au/~pdb/modelling/particle/
> Another that I had lost.
> Thanks!
No problem sir.
--
Ken Tyler
mailto://tylereng@pacbell.net
http://home.pacbell.net/tylereng/links.htm
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Looks like my other message didn't go through...
Anyway, the blobs make the water drops merge together similar to real
droplets, the LiquidSpray include file also does it. My particle
simulator takes a different approach, and outputs calls to a macro,
which allows me to easily vary the results without re-simulating the
model.
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Axel Hecht wrote:
> Hi,
> I have one question:
> Any idea why the particles are converted to blobs by Andreas?
I'm not even sure where I found that site and since it has no executables
I havn't looked at it too closely. It is provided by me mostly as an aid
to others that might want to look into it's possiblities.
--
Ken Tyler
mailto://tylereng@pacbell.net
http://home.pacbell.net/tylereng/links.htm
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