I call it a "Particlesystem" ! :)

no, seriously.  I had to make my own particlesystem, because apparently 
there's no way to randomize Rune's particle-system (the variable 
particle_seed is never used, you might want to look into that, Rune :)) 
and I couldn't just change it in his code or I would have to release it 
under the GPL, which I don't like (GPL is like a virus: everything that 
uses something that has it, becomes a GPL'ed thing itself).

So, the basic principles are the same as in every particle-system: you 
have a particle-emitter which, you'll probably never guess, emits 
particles! :)  those particles have a starting speed and are affected by 
outside forces, like gravity.  There's also a possibility to add an 
environment, and as you can see in this animation, it's also possible to 
let the particles "flow" along the surface of the environment.  It has 
no particle-particle interaction, so it's impossible to accurately model 
fluids with it, but as you can see here, it can produce fluidlike 
animations :)

As with all my include files, it's not yet finished and maybe never will 
be :-/
it all depends on how much demand there is for yet another particle 
system.

cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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