The box you are using to cut the hole in the wall needs to be slightly
thicker than the wall.

  (Else you get a coincident surfaces problem, which causes things to
not to work properly. In layman terms, if the surface of the cutting
box is exactly in the same place as the surface of the wall, POV-Ray
has no way of knowing whether it should be cut or not. In practice
whether that happens or not will depend on floating point calculation
inaccuracies, which might even change on a per-ray basis.)

-- 
                                                          - Warp

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