Editing Boundary conditions (section)

== Infinite 3D geometries ==

Infinite 3D lattices are created similar to infinite 2D lattices, by defining the outside space using a single cell and surface, for example:

 <nowiki>
cell 999 0 outside  b1</nowiki>

The difference to the 2D case is that surface b1 is one of the 3D surfaces listed above, in this case, a cube. The difference to the radially infinite, axially finite 3D case above is that the geometry is limited to a repeated boundary in all directions. Reflective boundary conditions are illustrated below.

<gallery mode="nolines" widths=320px heights=320px>
Image:refl3Di.png|'''Reflective boundary conditions''' ("set&nbsp;bc&nbsp;2", yz-plot). See [[media:refl3Di.gif|animated particle tracks]].
</gallery>

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