Lots of samples, perhaps?
'samples 10,20' is 10 minimum, 20 maximum so maybe 25,30 or more. This slows 
things down but smooths the volume out.
It varies for the object (area). Think scaling up a little might smooth it too 
but I've not done much with media yet. Just a Saturns rings and small lights.

Message <36123815.0@news.povray.org>, Fabio Pellacini  typed...
>
>Hi,
>I am very interested in volumetric rendering, and since now POV have this
>ability I try to play with it just a bit.
>The fact is that I can only render volumetric fire or clouds that appears to
>be "pointilized". I mea I can't get a continuos color inside the flame for
>example. The fact is that if you take a photo of a flamne, the "interior"
>appears continuos, so the question is,
>there is some ways of taking away the pointilized effect?
>
>Thanks a lot
>
>            --fabio
>
>-----------------
>------------------------------------------------------------
>Fabio Pellacini
>Ph.D. student - CS Dept. of Cornell U.
>e-mail:   fab### [at] cscornelledu
>web-page: http://www.cs.cornell.edu/fabio
>------------------------------------------------------------
>
>
>
>

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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