Am 18.04.2015 um 20:18 schrieb afm:
> A union of two boxes like
>
>          union {
>                  box { <0,0,0> <1,1,1> }
>                  box { <0.5,0,0> <1.5,1,1> }
>          }
>
>   should be indistinguishable from a single box
>
>          box { <0,0,0> <1.5,1,1> }

That's only true when the surfaces of the boxes are opaque. To suppress 
internal surfaces, use merge{} instead of union{}.

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