> What would cause light sources, located on the opposite side of opaque
wall,
> to illuminate the near side, as if they are shining through the wall?
>
> I've been getting this since I switched to the beta version of POV, and
put
> in photons to my project.
>
> One of the light sources.
>
> //Leftmost LED
> light_source { <0,0,0> color Red * LED_Brite
>                 photons { refraction on reflection on area_light }
>                 spotlight point_at <0,1,0> tightness 10 radius 0.1 falloff
> 20
>                 looks_like {Red_LED}     //Otherwise, they aren't visible
>                 translate<-2.6,0.2,-0.70>  //F-B U-D R-L Put the LEDs
under
> their pipes
>                 }
>
> Plastic wall
>
> #include "slp_may10\top_housing.inc"
> object {TOP_HOUSING
>         photons{target reflection on refraction off collect on}
>         }
>
> The view point is above the plastic looking down, the leds are below,
> looking up.
> I posted a section of the image in povray.binaries.images that shows the
> problem.

if you don't need the photons to interact with the (whatever you call it),
you can add
photons{collect off}
to the object and it will ignore the photons.

-tgq

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