If I have a given function for an isosurface (e.g. x*x+y*y-1), what 
variable substitution do I have to do to repeat this surface, say along 
the z-axis every 2 POV-Units?
I want to achieve sth. like the "texture" in Tor Olav's "Entering" 
(http://news.povray.org/povray.binaries.images/33512/).

I tried to substitute x using mod(x,2), and I also tried using 
sin(x*something) and both of them came near to what I want, but not 
really :)

Thanks for your Help
Florian

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