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<li class="toctree-l1 current"><a class="reference internal" href="Modify.html">3. Modifying & extending LAMMPS</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="Modify_style.html">3.4. LAMMPS programming style</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_pair.html">3.6. Pair styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_bond.html">3.7. Bond, angle, dihedral, improper styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_command.html">3.10. Input script command style</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">3.14. Region styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_body.html">3.15. Body styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_gran_sub_mod.html">3.16. Granular Sub-Model styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_thermo.html">3.17. Thermodynamic output options</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_variable.html">3.18. Variable options</a></li>
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<li class="breadcrumb-item active"><span class="section-number">3.14. </span>Region styles</li>
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<p><span class="math notranslate nohighlight">\(\renewcommand{\AA}{\text{Å}}\)</span></p>
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<section id="region-styles">
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<h1><span class="section-number">3.14. </span>Region styles<a class="headerlink" href="#region-styles" title="Link to this heading"></a></h1>
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<p>Classes that define geometric regions are derived from the Region
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class. Regions are used elsewhere in LAMMPS to group atoms, delete
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atoms to create a void, insert atoms in a specified region, etc. New
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styles can be created to add new region shapes to LAMMPS.</p>
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<p>Region_sphere.cpp is an example of a spherical region.</p>
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<p>Here is a brief description of methods you define in your new derived
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class. See region.h for details.</p>
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<table class="docutils align-default">
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<tbody>
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<tr class="row-odd"><td><p>inside</p></td>
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<td><p>determine whether a point is in the region</p></td>
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</tr>
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<tr class="row-even"><td><p>surface_interior</p></td>
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<td><p>determine if a point is within a cutoff distance inside of surface</p></td>
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</tr>
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<tr class="row-odd"><td><p>surface_exterior</p></td>
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<td><p>determine if a point is within a cutoff distance outside of surface</p></td>
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</tr>
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<tr class="row-even"><td><p>shape_update</p></td>
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<td><p>change region shape if set by time-dependent variable</p></td>
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</tr>
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