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May 16, 2010 at 15:44 history edited Niall Murphy CC BY-SA 2.5
Changed from an octagon.
May 16, 2010 at 13:53 comment added Niall Murphy Ah, my brain just substituted it with "octagon" when I read the question. Anyway, the above code makes the desired shape if you set "regular polygon sides=4" and place a node at "(oct.center)"
May 16, 2010 at 11:56 comment added André Henriques Nevertheless, tikz is vastly superior to xy-pic for drawing diagrams.
May 15, 2010 at 20:25 comment added S. Carnahan This appears to be an octagon, not an octahedron.
May 15, 2010 at 19:21 history answered Niall Murphy CC BY-SA 2.5