Many different approaches exist to visualize a crystal structure. As the inpgen
input generator of FLEUR creates a struct.xsf
file in the xsf file format introduced by xcrysden
you can use this file.
For example the following codes might be used:
As this tutorial has ASE installed we can use this as a very simple example:
from ase.io import read
from ase.visualize import view
atoms=read("inpgen/struct.xsf")
view(atoms, viewer='x3d')