[yt-users] Particles in volume rendering

[Matthew Turk]

> The main is to define a new field that translates particles to density. This
> example picks out star particles; it should be easy to remove this if you like
> by eliminating the 'sel' stuff below.

As a quick note for other users, the field Stephen describes is
already in Universal fields as "particle_density_pyx", and a similar
one ("star_density_pyx") is defined for star particles in Enzo.  For
Orion the particle situation isn't clear to me, so I don't know how
that would work.



-Matt