You could use a sample of a pattern and apply it to hexagon pillars...
that would give a height for each and they would be much more like actual
basalt, if that was what you were aiming for.  For the centerpoint of each
column, grab a value from one of the patterns like bumps.
    Hmm, gives me an idea.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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