I'm messing with media, trying to create a rocket exhaust plume. I'm 
more or less a beginner when it comes to media stuff. I've been 
moderately successful, however I'm having a problem:

#declare exhaust_half=
intersection  {
   sphere {
      <0,0,0>,2   
      hollow
      no_shadow
      texture { pigment { rgbt 1 } }
      interior  {
         media {
            emission 0.9   method 3 intervals 10
            density  {
               denT3
            }
         }
         media  {
            absorption .2 method 3 intervals 10
            density {
               denT3
            }
         }
      }
   }
// Cut away negative y; doesn't do what I want:
   cylinder {<0,0,0>,<0,1.01,0>,1000}
}

What I'm trying to get here is a media cloud that is not a complete 
sphere but one half of a sphere. The problem is that if I look at this 
from below (camera's y<0) the 'bottom' of the media cloud looks black, 
as if it's opaque. It doesn't matter if I use intersection, difference 
or clipped_by. How can I get a media cloud that is not a complete sphere 
but only for example the part of the sphere with y>0 ?

-- 
Bjorn Jonsson / bjj### [at] ZZZmmediais
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