I was looking at a Perlin Noise function which used a type of cubic
interpolation as well as cosine interpolation to produce noise. The
cubic interpolation went above the highest points(look at the site to
see what I mean), but the cosine interpolation didn't. If POV-Ray uses
cubic interpolation in this way and clips it to the range from 0 to 1,
this would explain the "mesas".
The web site was:
http://freespace.virgin.net/hugo.elias/m_perlin.htm

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