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# compute smd/triangle/vertices command

## Syntax

    compute ID group-ID smd/triangle/vertices

- ID, group-ID are documented in compute command

- smd/triangle/vertices = style name of this compute command

## Examples

    compute 1 all smd/triangle/vertices

## Description

Define a computation that returns the coordinates of the vertices corresponding to the triangle-elements of a mesh created by the fix smd/wall_surface.

See this PDF guide to using Smooth Mach Dynamics in LAMMPS.

## Output info

This compute returns a per-particle vector of vectors, which can be accessed by any command that uses per-particle values from a compute as input. See the Howto output page for an overview of LAMMPS output options.

The per-particle vector has nine entries, (x1/y1/z1), (x2/y2/z2), and (x3/y3/z3) corresponding to the first, second, and third vertex of each triangle.

It is only meaningful to use this compute for a group of particles which is created via the fix smd/wall_surface command.

The output of this compute can be used with the dump2vtk_tris tool to generate a VTK representation of the smd/wall_surface mesh for visualization purposes.

The values will be given in units of distance.

## Restrictions

This compute is part of the MACHDYN package. It is only enabled if LAMMPS was built with that package. See the Build package page for more info.

## Related commands

fix smd/move/tri/surf, fix smd/wall_surface

## Default

none