I got no reply on my previous post, so I'll try again.

The following code should in my understanding produce a redish sphere
(attenuation of colors appearing behind the sphere) but no shadow with
media_attenuation off on the light source. 
////////////////////
camera {location  -z*4.0}
background{color rgb .7}

light_source {<-30, 60, 30> color rgb 1  
  media_interaction off
  media_attenuation off
}

box {<-2,-1.2,-2><2,-1,2>  pigment { color rgb 1 } finish{diffuse .9}}

sphere {  0.0, 1 hollow
  pigment {rgbt 1}
  interior{
   media{absorption rgb <0,1,1>}
   //media{scattering{1 rgb <1,0,0>*5 extinction 0 }}
  }
}
////////////

POV 3.1 seems to respond appropriately, but both MegaPOV and POV 3.5 do
not respond to media_attenuation (or media_interaction for that matter)
with absorption media. Sample pics posted in povray.beta-test.binaries.

Can someone substantiate this?

Abe

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