In article <397a694d@news.povray.org>, "Jetlag" <bga### [at] microsoftcom> 
wrote:

> I got the texts but haven't reviewed them yet, the web site seems 
> abandoned, though.

I've poked through the papers, but haven't really tried to analyze them 
yet. I haven't been able to figure out exactly how their model is put 
together.


> I'm not sure what you mean, like air-resistance? If so, then no. It's 
> a very limited model right now.

Basically just a damping effect, which decreases velocities by a certain 
amount each step. The simplest way to do it would be to multiply the 
velocity by a certain variable amount...1 being no resistance, 0 being 
infinite resistance. Using a greater amount of damping(a smaller value) 
might help to keep the simulation stable. Similar to air resistance, but 
more simplistic.

One thing you might try to do is separate the passage of time from the 
number of iterations, so each iteration covers a specifiable amount of 
time. You could just increase the iterations while keeping the time 
constant to help make the simulation more stable.
The only disadvantage to this is speed, but it might be possible to use 
more iterations only in areas which need it, areas which are under a lot 
of stress or which are moving quickly relative to the neighboring areas.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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