In article <39832631@news.povray.org>, "Bob Hughes" 
<per### [at] aolcom?subject=PoV-News:> wrote:

> Fairly good distribution.  Made me think of something though.  A 
> tightness factor could be good, kind of like a density variable. 

If you mean a way to adjust the way the particles fall off toward the 
edges, that would certainlly be possible.


> I can guess that by temperature you already have a proximity thing 
> going on there.  I haven't seen anything written about it to know 
> what's involved. 

It has nothing at all to do with proximity...the particles start out 
with a certain temperature, and cool off toward 0, the ambient 
temperature. Hot particles rise more quickly than cooler particles. As 
the particles cool off, the smoke settles into a layer.


> What I'm thinking is that if a constraint variable were put on the 
> particles which would allow for a forced closeness at a orifice then 
> there would be more densely packed yet active particles.  And upon 
> leaving the constrained zone they could become more diffuse and less 
> active.  As one other force I'm talking about, mixed in with the 
> others.  Does that seem right?  Or is there no reason to consider 
> that type of thing?

Uhh, I think you should look to the particle_system patch for that. This 
was supposed to be an extremely simplified particle system which doesn't 
require any unofficial features, just to demonstrate a way to get smoke 
to rise realistically.
Besides, what you are asking for sounds like inter-particle forces, 
which are slow even in C...I have done it before in POV-Script, but the 
parse times were terrible.

-- 
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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