fix_planeforce.html
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	<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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	<H3>fix planeforce command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>fix ID group-ID planeforce x y z
	</PRE>
	<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
	<LI>lineforce = style name of this fix command
	<LI>x y z = 3-vector that is normal to the plane
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>fix hold boundary planeforce 1.0 0.0 0.0
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>Adjust the forces on each atom in the group so that it's motion will
	be in the plane specified by the normal vector (x,y,z). This is done
	by subtracting out components 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>The forces due to this fix are also imposed during an energy
	minimization, invoked by the <A HREF = "minimize.html">minimize</A> command.
	</P>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "fix_lineforce.html">fix lineforce</A>
	</P>
	<P><B>Default:</B> none
	</P>
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