Eric Gundersen wrote:
> 
> 1)  Are the media effects dependent on the scale of the container?  For
> example, if my light bulb is contained by a 5 inch or a 50 inch sphere,
> should I expect different results?
>

Media density (per unit of volume) remains constant no matter how you scale the
container. This means the same media in a smaller container will look more
transparent, because there is less media to "see through".
If you want the transparency of the media to appear the same after scaling, you
can do this: let's say Si is the initial scale of your media(container), Sf is
the final scale, and D is the initial density. The new density for the scaled
media is:
(pow((Si.x * Si.y * Si.z) / (Sf.x * Sf.y * Sf.z), 1/3) * D)

> 2)  Can I have more than one media container in a scene?  I have tried
> to surround each bulb with its own container (a sphere),  but it seems
> that only one of the containers works.  The rest don't do anything.
> 

Of course you can have multiple containers. Are you sure you did it right? All
containers need to be hollow, and they all must have a media attached. Here's a
simple example, with two media containers:

sphere{
  <-1,0,0>,1
  pigment{rgbf 1}
  interior{media{emission 1}}
  hollow
}
sphere{
  <1,0,0>,1
  pigment{rgbf 1}
  interior{media{emission 1}}
  hollow
}

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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