mpb space grid sampling and symmetry

Hello Steven, all veterans and all proffesional mpb users. I try to implement the brillouin symmetries of differnet crystal types, because I need to sample a volume of k points in the first brillouin zone, so I want to comput only for k points inside the volume of the irreduicble brillouin zone. In order to implement rotation symmetry or mirror symmetry I need to know how the fields and power output h5 files are sampled for 3D space grid.

I know that given a resolution of N, and lattice basis R1, R2, R3, mpb samples r=n1*R1+n2*R2+n3*R3, where there are NxNxN samples. I want to know how n1,n2,n3 are chosen, so I can implement roatation and mirror operators on the h5 fields and power distribution files. Is it n1=-N/2:N/2-1 or somethjing like that?

I know I can use mpb-data to rearrange the resolution and smapling grids, but it doesn't give any information on how the grid is sampled.

thanks in advance

Amnon

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