I am trying to make a very simple cylindrical light that glows in the dark
(similar to, say, the blade of the lightsaber of Star Wars). If I use:

#include "colors.inc"
#include "glass.inc"
#include "textures.inc"


camera {
location <55-10,0,0>
look_at <0,0,0>
angle 40
rotate <0,0,0>
}


#declare transp = texture {
   pigment {rgbt < 1, 0, 0, 1>}
   finish {reflection 0}
}

cylinder
 {<0,-10,0>,<0,10,0>,40 texture{transp} hollow
  interior
   { media
     { emission 2
       density
       { cylindrical density_map
        { [0.2 rgb <0,0,0>]
           [0.6 rgb <0.05,0,0>]
           [0.7 rgb<0.08.0,0>]
           [0.8 rgb <0.1,0,0>]
           [0.95 rgb <0.2,0,0>]
           [1 rgb <1,1,0>]
         }
       }
     }
  }
rotate <90,0,0>
scale<4,4,4>
 }


light_source{
<0, -50, 0>
color Red
shadowless
}

light_source{
<0, -100, -300>
color White
}




I obtain what I want. However, I must first create the object in the y direction
and then rotate it, while I would like to create it directly along the
orientation I want. Anybody knows a way to do it?

Furthermore, I obtain the blobs at the ends, which I could eliminate with
"difference", but, still, is there another way?

Thanks.

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