"Thomas de Groot" <t.degroot [at] internlDOTnet> schreef in bericht 
news:4827f2db$1@news.povray.org...
>
>
> What I have done sometimes, and if some repetition is not too obvious in 
> the final image, is to mirror a height_field along x or z (or both, 
> according to need). The seam is absolutely invisible.
>

Forgot to mention the following possibility (if you use programs like 
Leveller, World Machine, GeoControl, or whatever):
1) make a height_field
2) duplicate it
3) mirror the duplicate along x or z (or both)
4) modify the central parts of the duplicate, leaving the edges unchanged 
(very important, obviously)
5) tile the original height_field and the duplicate(s)

Thomas

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