Does the shape of the simulation box has to be a cube on periodic boundary conditions

[hkayabilisim]

Hi,

When I look at the source codes of Ewald implementation here: https://github.com/N-BodyShop/changa/blob/27cbc83121ada9a2c01d0869802c77f49bfd4000/Ewald.cpp#L123

I see that the simulation box is assumed to be a cube. Does it mean that I cannot use rectangular boxes with different sidelengths in the periodic boundary conditions?

Thanks Huseyin