[lammps-users] void volume fraction

Dear Lammps Developer, Users,

I did not find in the documentation, unfortunately. And in the example, shear or obstacle, I did not see anything.
Is there an algorithm already implemented in Lammps to keep track of the void volume fraction?

Thanks for your help,

LAMMPS doesn't compute this. How do you
compute void volume fraction? If it's a local
computation (geometrically), you could write a fix
to do it. If not, you're better off post-processing it
from a dump file.