In article <38822DBD.812A2DD7@erols.com> , John VanSickle 
<van### [at] erolscom>  wrote:

> Passing through a non-hollow object appears to turn off all media
> rendering for a ray.  The docs imply that only the object containing the
> media needs to be hollow; actually, *any* object through which the
> media will be seen needs to be hollow.

How do you come to that conclusion? The sample scene below shows the
contrary.


     Thorsten




global_settings { assumed_gamma 2.2 }

#include "colors.inc"

camera {
   location  <0, 20, -100>
   direction <0,  0,    1>
   up        <0,  1,    0>
   right   <4/3,  0,    0>
}

plane { y, -10
   pigment {
      checker Blue, Green
      scale 20
   }
   finish {
      ambient 0.2
      diffuse 0.8
   }
   hollow
}

plane { z, 50
   pigment {
      checker Blue, Green
      scale 20
   }
   finish {
      ambient 0.2
      diffuse 0.8
   }
   hollow
}

#declare Media = media {
  emission 0.05
  intervals 5
  samples 1, 10
  confidence 0.9999
  variance 1/1000
  density {
    spherical
    ramp_wave
    turbulence 0.1
    color_map {
      [0.0 color rgb <0, 0, 0>]
      [0.1 color rgb <1, 0, 0>]
      [1.0 color rgb <1, 1, 0>]
    }
  }
}

sphere { 0, 1
  pigment { color rgbf<1, 1, 1, 1> }
  finish { ambient 0 diffuse 0 }
  interior { media { Media } }
  scale 28
  translate <29, 20, 0>
  hollow
}

sphere { 0, 1
  pigment { color rgbf<1, 1, 1, 0.7> }
  scale 12
  translate <23, 20, -50>
  hollow no // either with or without
}

light_source {
  <500, 600, -200>
  color White
}

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