Wasn't it Defective who wrote:
>Doesn't seem to work that way...
>
>At least, not when I tried:
>
>difference {
>    box { <-5,-5,-5>,<5,5,5> pigment { Clear } }
>    box { <-2,-2,-2>,<2,2,2> pigment { Orange transmit .5 } }
>}
>
>sphere { <0,0,0>,.5 pigment { Red } }
>
>Of course, I may have no clue what I'm doing...

The syntax is

box { <-2,-2,-2>,<2,2,2>
   texture {pigment {Clear}}
   interior_texture {pigment {Orange}}
}

Interior_texture is not supported in POV 3.1. You need POV 3.5 or
MegaPOV.

-- 
Mike Williams
Gentleman of Leisure

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