Penners <pen### [at] hotmailcom> wrote:
>   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.

  I don't think there's need. AFAIK "collect on" is the default setting
for all objects.

>  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.

  Have you tried "pass_through" in the photons block of the box?

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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