$$\renewcommand{\AA}{\text{Å}}$$

# 3.13. Region styles¶

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