In article <396A1D01.C701A4CD@schunter.etc.tu-bs.de>, 
chr### [at] gmxde wrote:

> Have you ever looked at a mountain region from above: most mountains 
> have quite plane sides and very sharp ridges.

Yes, but they eventually get smoothed over by time and weather. Sharp 
points and steep sides shear off and the debris accumulates at the 
bottom, and the mountain becomes more hill-like and rounded.
Your filter looks more like a "time machine", reversing the normal 
erosion process.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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