Hi Tim
As planes, height fields have an interior which extends at infinite
your difference reveals that interior.
You may do an intersection between the hf and a surrounding big box before
doing the difference between this CSG and your small box
Marc

news: 3df81524@news.povray.org...
> Observe attached image with a cube differenced from a heightfield.
> How do I get the cube to completely difference from the heightfield
> without leaving the planar surface?  Also, if I enlarge the cube
> being differenced along the vertical axis, it effectively 'pushes'
> the surface of the heightfield...

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