Hello dear users, As you know, there are four principal coordinates to create and obtain other FCC coordinations : (0.0.0) , (0.5,0.5,0) , (0.5,0,0.5) , (0,0.5,0.5) now, I want to change my xyz coordinates : x = [11-2] y= [1 -1 0] z=[-1-1-1] and I don’t know with changing xyz coordinates, four principal coordinates how change. i want to code FCC structure of Aluminium with this xyz coordinates in Python. thanks for helping me .