On 05/12/2013 04:33 AM, LanuHum wrote:
> Sorry! First post by "yes" - this is my post. Error input.
> Problem Scattering media and photons in this code:
>
>
>
> global_settings{
>      assumed_gamma 1
>      max_trace_level 10
>      photons {
>          count 300000
>          autostop 0
>          jitter .4
>      }
>      adc_bailout 1/10
> }
>
>    #include "textures.inc"
>    #include "colors.inc"
>    camera {
>      location <0, 1, -4>
>      look_at <0, 2, 0>
>      angle 80
>    }
>
>
>
>   camera { location <14.9, 1, -8> look_at -z angle 70 }
>   light_source { <10,100,150>, 1 }
>   background { rgb <0.3, 0.6, 0.9> }
>
>   // A dim light source inside the room which does not
>   // interact with media so that we can see the room:
>   light_source { <14, -5, 2>, 0.5 media_interaction off photons { reflection off
> } }
>
>   // Room
>   union
>   { difference
>     { box { <-11, -7, -11>, <16, 7, 10.5> }
>       box { <-10, -6, -10>, <15, 6, 10> }
>       box { <-4, -2, 9.9>, <2, 3, 10.6> }
>     }
>     box { <-1.25, -2, 10>, <-0.75, 3, 10.5> }
>     box { <-4, 0.25, 10>, <2, 0.75, 10.5> }
>     pigment { rgb 1 }
>     photons { target reflection on }
>   }
>   // Reflective floor:
>   box
>   { <-10, -5.99, -10>, <15, -6, 10>
>     pigment { rgb 1 }
>     finish { reflection <0.5, 0.4, 0.2> }
>     photons { target reflection on}
>   }
>   // Scattering media box:
>   box
>   { <-5, -6.5, -10.5>, <3, 6.5, 10.25>
>     pigment { rgbt 1 } hollow
>     interior
>     { media
>       { scattering { 1, 0.07 extinction 0.01 }
>         samples 30
>       }
>     }
>   }
>
>

I thought this example was very familiar ... it's basically from the the 
tutorial section on media. You forgot /one/ important step. Have a look 
at this section and see if you can spot it:

http://wiki.povray.org/content/Documentation:Tutorial_Section_3.7#Media_and_photons

BTW: you also have 2 camera definitions (one gets ignored ... see 
warning stream)

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