triple_r wrote:
> In all fairness, there are better methods.  Think of dividing all the particles
> up into an octree.  A whole group of particles at a distance can be lumped into
> one mass. 

I was thinking, that sounds more like figuring out how galaxies 
interact, given where all the stars are. Then I went to

> http://www.astro.ex.ac.uk/people/mbate/Animations/

The octree of which stars are in which galaxies can be presumed fairly 
static, I think. Might not be appropriate where every object is moving 
everywhere in the scene.

-- 
Darren New / San Diego, CA, USA (PST)

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