In article <web.40aba571c1340bc7a0c272b50@news.povray.org>,
 "gonzo" <rgo### [at] lansetcom> wrote:

> I know teacher, I know!  <waving hand wildly>
> 
> I had this same problem when I was learning to play with media. Try removing
> the filter component of your pigment.

That would make it impossible to see the media at all.

The problem is a too-low max_trace_level. The default is 5, but with 3 
spheres, you can see through up to 6 surfaces. POV just stops after the 
fifth surface, using the background color rather than tracing more rays. 
Just put a higher max_trace_level in global_settings. I generally leave 
it around 12, you'll need to go higher in situations where you can see 
through a lot of transparent surfaces or reflections.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

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