> OK, to put it in few words. I need to simulate a laser. An object with 
> high ambient and radiosity looks like a good solution, but I *really* want 
> to avoid radiosity (hard to keep good quality on an animation, issues with 
> tiled rendering, etc). I guess it should be possible with media; but note 
> I'm a noob with media, so please explain slowly. The laser doesn't have to 
> be realistic at all. It's game graphics; highly-exaggerated will do.

I've always liked bright emission medias for sci-fi lasers.
Looks best on a dark background, IMO.

cylinder {<-2,0,0>,<2,0,0>,0.2
   hollow
   material {
      texture {
         pigment {Clear}
      }
      interior {
         media {
            emission NeonBlue*7
            density {
              cylindrical
              rotate <0,0,90>
              scale <1,0.2,0.2>
            }
         }
      }
   }
}

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