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<div class="section" id="compute-smd-tlsph-shape-command">
<span id="index-0"></span><h1>compute smd/tlsph/shape command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">smd</span><span class="o">/</span><span class="n">tlsph</span><span class="o">/</span><span class="n">shape</span>
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
<li>smd/tlsph/shape = style name of this compute command</li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">smd</span><span class="o">/</span><span class="n">tlsph</span><span class="o">/</span><span class="n">shape</span>
</pre></div>
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</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Define a computation that outputs the current shape of the volume
associated with a particle as a rotated ellipsoid. It is only
meaningful for particles which interact according to the
Total-Lagrangian SPH pair style.</p>
<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to use Smooth
Mach Dynamics in LAMMPS.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a per-particle vector of vectors, which can be
accessed by any command that uses per-particle values from a compute
as input. See <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">How-to discussions, section 6.15</span></a> for an overview of LAMMPS output
options.</p>
<p>The per-particle vector has 7 entries. The first three entries
correspond to the lengths of the ellipsoid&#8217;s axes and have units of
length. These axis valus are computed as the contact radius times the
xx, yy, or zz components of the Green-Lagrange strain tensor
associated with the particle. The next 4 values are quaternions
(order: q, x, y, z) which describe the spatial rotation of the
particle relative to its initial state.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This compute is part of the USER-SMD package. It is only enabled if
LAMMPS was built with that package. See the <a class="reference internal" href="Section_start.html#start-3"><span class="std std-ref">Making LAMMPS</span></a> section for more info.</p>
<p>This quantity will be computed only for particles which interact with
the Total-Lagrangian SPH pair style.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="compute_smd_contact_radius.html"><span class="doc">smd/contact/radius</span></a></p>
<p><strong>Default:</strong> none</p>
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