When posting a "why this scene doesn't work properly" question, it's
always a good idea to reduce the scene to the minimal (but still
complete, meaning that it's rendable as it is, ie. has the proper camera
and light definitions necessary to render it properly) possible.
It's also a bad idea to require some non-standard includes which people
might not have installed unless this include is very essential for
showing the problem (some color definitions aren't).

  This is a good practice for several reasons.
  Firstly it's polite: It reduces the amount of work for people (who, after
all, are helping you for the goodness of their heart) have to do in order
to find the problem in question. It's polite to first make some work to
make it easier for people to study your scene.
  Secondly, the smaller and simpler your scene is, the more probably people
will look at it and find an answer. If the scene is too complicated, most
people will simply skip it.
  Thirdly, while you reduce the scene you might find the problem yourself,
thus avoiding the whole trouble and probably learning something new.

-- 
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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