using mpb-data

I wanted to get 3D image of FCC lattice, I got epsilon.h5 to run mpb with
diamond.ctl file in the mpb-ctl/example directory, just substituted geometry
as simlple one sphere centered in origin, radius was sqrt 0.125, as below :

(set! geometry (list (make sphere (center 0) (radius (sqrt 0.125)) (material
diel))))

I cannot get retangular cell image with mpb-data -r -m 1 , I used following
command :

mpb-data -r -e 1,0,0 -m 2 -n 128 episilon.h5
h5tovtk -d data-new episilon.h5

and I used paraview to view vtk file.

But image I got was as following, length along y and z axis was not
multipled.



And I cound not get proper image with -m 1, but following image.



Finally I tried with -r -e 1,0,0 -x 1 -y 2 -z 2, I got following result
image.


I cannot understand that 'abnormal' two behaviors : I knew -m is equal to -x
2 -y 2 -z 2

and why the result of -m 2 is not a cube but a retangular parallelpiped, and
the result of -x 1 -y 2 -z 2 is cube.


And I tried another possible options, with following :

-r -e 1,0,0 -e 0,1,0 -e 0,0,1 -x 1 -y 2 -z 2

the result was as below :



I think the result should be no difference with third one. but It was not.
why?



First of all, What can I do to get proper 3D image of FCC cell?