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# 3.14. 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