lammps/doc/txt/Modify_region.txt

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"Higher level section"_Modify.html - "LAMMPS WWW Site"_lws - "LAMMPS
Documentation"_ld - "LAMMPS Commands"_lc :c
:link(lws,http://lammps.sandia.gov)
:link(ld,Manual.html)
:link(lc,Commands_all.html)
:line
Region styles :h3
Classes that define geometric regions are derived from the Region
class. Regions are used elsewhere in LAMMPS to group atoms, delete
atoms to create a void, insert atoms in a specified region, etc. New
styles can be created to add new region shapes to LAMMPS.
Region_sphere.cpp is an example of a spherical region.
Here is a brief description of methods you define in your new derived
class. See region.h for details.
inside: determine whether a point is in the region
surface_interior: determine if a point is within a cutoff distance inside of surface
surface_exterior: determine if a point is within a cutoff distance outside of surface
shape_update : change region shape if set by time-dependent variable :tb(s=:)