Warp wrote:

> If you do that, the caustics change drastically. The box is not "invisible"
> to the photons.

hmm ... indeed. You also need to specify "collect off". Then your
box with rgbt 1 and ior 1.0 does not seem to change the caustics,
although it likely causes more internal calculations due to the
invisible ray intersection points. The media also shows up:

--------------------------------------------------------------
global_settings { max_trace_level 10 photons { count 10000 media 100} }
camera { location <0, 1, -5> look_at -y*.5 }
light_source { y*10, 1 }
plane { y, -2 pigment { rgb 1 } }

sphere
{ 0, 1
   pigment { rgb <.9, 1, .9> filter 1 }
   finish { specular .5 roughness .01 reflection { .1, .3 } }
   interior { ior 1.5 }
   photons { target reflection on refraction on }
}

box
{ <-2, -1.9, -2>, <2, -1.5, 2> hollow
   interior
   {
     ior 1.0
     media {scattering {1, 0.5*<1,0,0>}}
   }
   pigment { rgbt 1 }
   photons { collect off refraction on}
}
--------------------------------------------------------------

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