I believe this is possible to do with isosurfaces - I'm just not very good 
at them :s

I need something like a sine wave extruded in the +z direction

If I have:
f(x) = sin(2*pi*x)

how do I get that into something like corrugated roof? I've read the 
excellent tutorial on isosurfaces <http://www.econym.demon.co.uk/isotut/> 
and can copy/paste as well as the next man but  am obviously missing 
something as I don't seem to be able to do what I need

As always, any input is greatly appreciated!

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