Two things:
+ I believe your cylinder should read:
	"cylinder {<0,0,0>,<0,2.01,0>,1000}"

+ Youshould first do the intersection, then apply the texture { pigment
rgbt 1 } } and the interior with the media to the whole object instead
of just the sphere.

		Jerome

Bjorn Jonsson wrote:
 > 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 ?
 >

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