web.467c834435b0b28870b838070@news.povray.org...
> Differencing will be a problem due to the fact that the heightfield is a
> polygon-based object, and therefore has no inside. You'll be able to see
> through the hole to the underside of the heightfield.
>

As says Thomas, it works. A heighfield has an inside.
It is easy for pov to find it as the heightfield has no overhanging.
It is the same section as the heightfield, and is infinite in the -y 
direction (before any tranformation of course)

Marc

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