Entre otras cosas, Tom Melly tuvo a bien escribir:

>> Drop a sphere with no_image, no_shadow, no_reflection, etc in the
>> union?
> 
> I had a similiar thought, but just pigment{rgbf 1} - still looks like a
> nasty kludge.

For a null object, in case it's needed, I suggest:

sphere {
  0, 0                             // or 0, 0.1
  clipped_by { sphere { 1, 0 } }   // or 1, 0.1
}

Would there be any problem with this?

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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