Is there a tool?

Hi,
 I had the same question as Ryan has asked.
 Is there a free tool that would give the brilloin
zone points given a lattice? IS there some rigorous
automated way that can be used to quickly arrive at
these points.
 Thanks
VR Sitaraman 

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>    1. Question about the irreducible Brillouin zone
> of a	triangular
>       lattice in MPB (Ryan Hao)
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----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 30 May 2007 18:21:29 +0800
> From: "Ryan Hao" <[email protected]>
> Subject: [MPB-discuss] Question about the
> irreducible Brillouin zone
> 	of a	triangular lattice in MPB
> To: [email protected]
> Message-ID:
> 
>
<[email protected]>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Dear All,
> 
>           I find a question about the irreducible
> Brillouin zone of a
> triangular lattice in MPB.
>           In the MPB manual, it give a example  for
> the irreducible
> Brillouin zone of a triangular lattice :
> set! k-points (list (vector3 0 0 0)          ; Gamma
>                      (vector3 0 0.5 0)        ; M
>                      (vector3 (/ -3) (/ 3) 0) ; K
>                      (vector3 0 0 0)))        ;
> Gamma
> (set! k-points (interpolate 4 k-points))
> 
> I am confused at the value of  K point!
> I think the value of K point should be  (vector3 (/
> 0.5 sqrt(3))
> 0.50).please see the picture attached.
> Why Steven put  (vector3 (/ -3) (/ 3) 0) here?
> 
>    0, 0.5
> 
> 0.5/sqrt3, 0.5
> 
> Gamma
> 
> 0, 0
> 
> M
> 
> K
> 
> -- 
> ===========================================
> 
> Best wishes
> 
>                       Yours,
>                       Ryan Hao
> 
> 
> 
> Wuhan National Laboratory for Optoelectronics
> Institute of Optoelectronic Sinence and Engineering,
> HUST University
> Wuhan, 430074, P.R.CHINA
> Phone: 86-027-87792242-809(O)
> Mobile:
> Fax:
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