Hi,

     Using Steve's and others suggestion of a clear cone and media, I'm
somewhat closer to what I want to achieve, but if you look at the image
where the light crosses the illuminated window, you can see clearly a kind
of dark/black hue or line. It doesn't show so much in the darker areas, so
how do I remove it?  Also, I'm getting it wrong where it's supposed to start
fading, can anyone help me with this? I've tried fade_distance in the light
source but can't see any difference between a low setting and a high
setting, ie, I've tried .8 and 3.8.

     Thanks for any help.

      ~Steve~

     Here's the code...

   light_source { <-10.125, 5.83, 13> colour Yellow * 1.5

  area_light <4, 0, 0>, <0, 0, 4>, 4, 4
  adaptive 1.5
  jitter

   fade_distance 3.8

    }


#declare Media =
media {

emission .028
      intervals 5
      samples 1, 10
      confidence .9999
            variance 1/1000
      density{
              gradient y
              ramp_wave
              turbulence 18 //0.3

              colour_map{
                        [0.0 colour <.6, .6, 0.3>]

                       }
              scale <1,1,1>
              translate <-10.6, 5.2, 14>
             }
      }


cone{<0,-7.5,0>20,
     <0,1.3,0>.05

     pigment{rgb Clear}
     interior{media{Media}}

     hollow

     translate <-10.6, 5.2, 14>
    }

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