I thought I would share this info.

Playing around with the GeoControl height_field program, I experimented with 
the "seamless" feature which I had not yet really used. The possibilities 
are interesting. In POV-Ray, I built this test, either by rotating or by 
flipping the base height_field generated by GeoControl. The result is a 
landscape wich shows little repetitions that are too obvious for the eyes. 
They are there of course, but more distributed over the whole surface. The 
seams however, are really invisible, and that is excellent.

Thomas

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