> >     #declare No_object1 = box {0 0}
>
>   Add "no_image no_reflection no_shadow" to it, so it should be completely
> ignored (at least in theory).

Not if used in difference. Or do I get something wrong?

To be more precise:

difference {
  box {<-1,-1,0> <1,1,1}
  box {0 0 no_image no_reflection no_shadow}
}

I did not try this, but if the stray ray actually hits the 0-box, I think it
would decide not to have hit the surface of the defference yet. Hence
it would continue INSIDE the object.

  Mark

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