How to define the hexagon structure in triangular lattice?

Dear all,
       I'm trying to calculate the gap map of the hexagon structure in square and triangular lattice.
       It's OK to define the structure in square lattice by using overlapping  of three blocks:
  (set! geometry (list
                        (make block (center 0) (material air)(size r c infinity ))                                                                             
                        (make block (center 0) (material air)(size r c infinity)(e1 0.5 (/(sqrt 3) -2) 0) (e2 (/(sqrt 3) 2) 0.5 0))                                                                             
                        (make block (center 0) (material air)(size r c infinity ) (e1 0.5 (/(sqrt 3) 2) 0 ) (e2 (/(sqrt 3) -2) 0.5 0))))
        
        But the pattern goes wrong when I use the same overlapping in triangular lattice.What's the mistake did I make? How to define the hexagon structure in a triangular lattice?
           Thanks,
            Mutian
      
          




bigbigfat
2007-03-19

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