POV-Ray : Newsgroups : povray.binaries.animations : Re: Simplified fluid dynamics Server Time
1 Nov 2024 23:17:03 EDT (-0400)
  Re: Simplified fluid dynamics (Message 1 to 3 of 3)  
From: Ben Birdsey
Subject: Re: Simplified fluid dynamics
Date: 6 Dec 2002 09:36:13
Message: <3DF0B60F.1080802@mail.com>
Here is an animation of the algorithm I proposed in advanced-users.

news://news.povray.org:119/chrishuff-87319E.20180303122002@netplex.aussie.org

It is a water drop that has been excited with some crazy surface waves. 
  The basic point is that the damping and attraction terms in the model 
eliminate some of the computational problems associated with "stiff" 
long-range forces (like gravity with it's 1/r^2 attraction) and point 
particles.  The "binding force" is weakly attractive at large distances 
and weakly repulsive at short distances which is similar to how 
molecules attract each other.  The damping removes energy from the 
system and does not allow computational errors to be magnified into 
run-away particles that are "accumulating
velocities that exceed light :-P"

Anyway, the water is too lumpy. I think I have a much better algorithm 
for simulating liquids based on a mesh-like description, but I am not 
sure how easy it would be to implement.


I hope you are suitably underwhelmed. :)

- ben

P.S. I'll post the POV files in p.b.scene-files, though I think it's a 
pretty silly rule.  Already someone has to check three different threads 
to follow this little comment...


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Attachments:
Download 'temp3.avi.dat' (116 KB)

From: Kevin Loney
Subject: Re: Simplified fluid dynamics
Date: 7 Dec 2002 01:05:23
Message: <3df18fa3@news.povray.org>
I implemented your suggestion, and it worked quite well.

as soon as I finish getting the animation options to work I'll
post an example, I imagine that when I animate it instead of
viewing only still frames, I'll achieve something similar to
what you have.

thanks for the help btw

--
Kevin
http://www.geocities.com/qsquared_1999/
#macro _(r)#if(r<12)#local i=asc(substr("oqshilacefg",r,1))-97;
disc{<mod(i,7)-3,div(i,7)-1,6>,z,.4pigment{rgb 10}}_(r+1)
#end#end _(1)//KL


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From: Ken
Subject: Re: Simplified fluid dynamics
Date: 7 Dec 2002 16:16:24
Message: <3DF2658B.725978@pacbell.net>
Ben Birdsey wrote:

> P.S. I'll post the POV files in p.b.scene-files, though I think it's a
> pretty silly rule.

It may be a silly rule but it is our silly rule and we appreciate you
following it.

-- 
Ken Tyler


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