[gmx-users] fix a group in truncated octahedron

[lammps lammps]

Hi GMX users,

I want to fix a group in a truncate octahedron. How can I dealt with the
question below,

There is One spherical rigid body consists of  face-center cubic lattices
fixed in the center of the box. I do not want to calculate the force and
energy between the paritcles of this rigid body, so that no matter how large
force between them shoud not blow up the rigid body.   How can I do this?

Thanks in advance.
-- 
wende
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