Maurya Shah <mau### [at] hotmailcom> wrote:
> Can anyone please suggest how the transparency of the media can be
> specified?

  The color specifies both the color and the transparency of the media.

  In chromatic terms, the hue/saturation of the color specify its color,
and the brightness specifies its transparency.

  That is, for example if you want an orange media you would use
rgb <1, .5, 0>. If you want to make it more transparent, diminish its
brightness. For example if you want to increase its transparency
by half, use rgb <.5, .25, 0>.

  The color of the density specifies how the light passing through it
is filtered.

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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