Good day everyone,
I want to make FDTD-Meep calcul with a structure periodic in two direction X 
and Z and I want to make sure that my .ctl file is good.I essentially have 
doubt with the necessary variables to set periodic boundaries conditions. Here 
is a part of my .ctl file:
(set! geometry-lattice (make lattice (size 4 8 4))) ; (set! geometry     
         (list
             (make block  (center 0 0 0)    (size 4 7 4)      (material  
backgroud))
             (make block  (center 0 0 0)    (size 1.5 1.5 1.5)  (material   
dielec))
         ))(set! pml-layers (list  (make pml (thickness 0.5) (direction Y))  )) 
(set! eps-averaging? true)
(set! force-complex-fields? false)
(set! output-single-precision? true)
(set! ensure-periodicity true) ;
(set! k-point (vector3 0.1 0.0 0.1))(set! sources (list
               (make source
               (src (make gaussian-src (frequency 0.2331) (fwidth 0.2))) 
(component Ey)
               (center 0 3.5 0)   (size 4 0 4) )))
I have two question:Is anything wrong with this part of the file?How to set the 
values of k-point vector (vector3 0.1 0.0 0.1) ? Is it possible to use (vector3 
0 0 0)?
I will really appreciate helps from anyone,Thank you in advance,Maximin.

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