The rotation
is continuous within each element.
Furthermore, since adjacent elements share nodes, the rotation
must also be continuous through the mesh. The sharing of nodes
enforces element continuity by requiring that the rotation of
adjacent elements be the same at the shared node and therefore
continuous through the element interface. This means that a plot
of the rotation will be continuous and not have any gaps or
overlaps, such as in the figure below with shared node 2. It
should be noted that in order to enforce element continuity, the
nodes at element interfaces (such as node 2 in the figure below)
must be shared. If each element has a separate node at the
interface, then each element could also have a different slope
and a gap or overlap could result in the structure.
