I want to visualize a sphere without any source . I write the code as 

meep> (set! geometry-lattice (make lattice (size 2 2 2)))
meep> (define A (make material-type (epsilon 12)))
meep> (set! geometry (list 
...                      (make sphere (material A) (center 1 1 1) (radius 1)))) 

Is my code corrrect? What resolution should I specify and how to calculate the
resolution? 

what should I write next as in the tutorial they have shown how to calculate the
field and specified sources also but I want to do it without any source. 

I will also like to know how did they arrive at figure of 200 in the (run-until)
command in the waveguide tutorial. 

Also why is the center of the current source mentioned at (-7 0) ?




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