Hi,
  I am rendering a scene with media in a transparent box a little above the
ground.  The media is defined by a density file.  I shoot photons at the
media-contained box.  I then want photons to be collected on the ground
(because I want to later modify POVRay to have the media emit photons of
different "colours" onto the ground), so I declare for the ground "collect
on" in the photon block.  But when the ground is allowed to collect photons
the shadow of the box is seen, versus the shadow of the shape of the
density in the box.  The shadow of the shape of the density can be seen
when I turn photon collection off for the ground.

  Does anyone know how I can collect photons on the ground, but still have
the correct shadow?

Thanks in advance.

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