This plugin reads LAMMPS trajectory files, a minimalistic plain text format for storing molecular coordinate trajectories.

A brief summary of the LAMMPS trajectory format, as read by VMD follows:

ITEM: TIMESTEP
 %d (timestep number)
ITEM: NUMBER OF ATOMS
  %d (number of atoms)
ITEM: BOX BOUNDS
  %f %f (alpha, a)
  %f %f (beta,  b)
  %f %f (gamma, c)
ITEM: ATOMS
  %d %d %f %f %f  (atomid, ?, x, y, z)
  ...

Notes:

Unused Data
This plugin only reads the index and coordinates for each atom. Any additional data recorded for an atom is ignored.