<p>Adjust the forces on each atom in the group so that only the
components of force in the plane specified by the normal vector
(x,y,z) remain. This is done by subtracting out the component of
force perpendicular to the plane.</p>
<p>If the initial velocity of the atom is 0.0 (or in the plane), then it
should continue to move in the plane thereafter.</p>
<p><strong>Restart, fix_modify, output, run start/stop, minimize info:</strong></p>
<p>No information about this fix is written to <aclass="reference internal"href="restart.html"><spanclass="doc">binary restart files</span></a>. None of the <aclass="reference internal"href="fix_modify.html"><spanclass="doc">fix_modify</span></a> options
are relevant to this fix. No global or per-atom quantities are stored
by this fix for access by various <aclass="reference internal"href="Section_howto.html#howto-15"><spanclass="std std-ref">output commands</span></a>. No parameter of this fix can
be used with the <em>start/stop</em> keywords of the <aclass="reference internal"href="run.html"><spanclass="doc">run</span></a> command.</p>
<p>The forces due to this fix are imposed during an energy minimization,
invoked by the <aclass="reference internal"href="minimize.html"><spanclass="doc">minimize</span></a> command.</p>
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