Hi Stephen,

I've googled for "number density asteroids" and found this:
http://www.cen.uiuc.edu/~sulfridg/asteroid/asteroid.html
There is a picture displaying *real* positions of the asteroids and a
map of the density of asteroids as a function of distance from the sun.
Shapes, sizes and colors also are shown.

Have you seen the thread "Isosurface approximation" of Kevin Loney,
started yesterday in p.b.i? His example object looks very "asteroidic"
(but will render slower than simple spheres).

   Sputnik

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