JRG wrote
> Have you put hollow inside the heightfield block?

Yep. I think I have remembered everything. Here's the
relevant code conserning mdeia and photons.

global_settings {
  photons {
    spacing 0.0075
    jitter 0.5
    media 100
  }
}

#declare M_Watx =
material {
  yadda yadda
  media {
    method 3
    samples 5,5
    intervals 1
    scattering { 2, rgb <0.1,0.18,0.2> }
    collect on
  }
}

height_field {
    yadda yadda
    hollow
    material { M_Watx }
  photons {
    target
    reflection off
    refraction on
    collect off  // I suspected this might be it but I doesn't seem to
matter
  }
}

-Jide

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