The background is there, it just doesn't show through the media. This is
logical, when you think about it: it is infinitely far, so it is hidden by
an infinitely thick layer of media. And in the vacuum of space you really
don't get these light/laser beams showing up, 'cause there is no scattering
media there. POV's media model is fairly accurate, so physically inaccurate
things (like visible laser beams a la Star Wars) cannot be done in this way.
Having said that - to get the effect you want I suggest you use a finite,
contained media instead of an infinite global one. Something like a large
dust cloud to make the light beam show up. Or if the beam is parallel (like
a laser) use an emitting media with cylindrical density.

Margus

Royce Sullivan wrote:
> 
> Greetings,
> 
> I've constructed a rudimentary 'spaceship'  with Spatch and included it
> into a pov scene file. I have a green spotlight underneath the ship
> shining downward. I'm using media interaction with the spotlight to
> create a an eerie  'beaming up effect' Well I've got all that working,
> but the problem is that I want to include a sky_sphere with clouds or at
> least a background with a gradient. Povray seems to ignore these other
> pieces of code such as the background or sky_sphere and just does the
> media interaction leaving with me with no background or sky_sphere.  Is
> it possible to have media interaction or attenuation and a background or
> sky_sphere in the same scene?
> Thanks in advance.
> 
> Yours sincerely or having my cake and eat it to;)
> Ronald F. Hicks
> dag### [at] yahoocom
> http://www.geocities.com/SoHo/1006
> 
> My own quote: "Povray is a powerful workhorse; grabbing the reins is the
> trick."

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