Pfft.
I rolled my own and came up with more or less the same curves, but the way the
parameters influence them is different (of course...).

Maybe I can adapt this into a pigment pattern and a normal.

Do we know who made, how, and where the files are for the illustrations at:
http://wiki.povray.org/content/Reference:Quilted_Pattern ?

That would be a huge help.

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