OOF2: The Manual
Split Quads (SplitQuads) — Split quadrilateral elements into two triangles.
targets parameter specifies which
to examine as possible candidates for splitting.
criterion parameter determines the
conditions under which splits will be accepted or rejected.
split_how parameter determines how the
diagonal is chosen for each split. When set to GeographicQ2T, neighboring
consulted for advice. When set to TrialAndErrorQ2T, both diagonals are
tried and the better one is chosen according to the given
Here's an example using the GeographicQ2T splitter.
Figure 6.108 shows a
Skeleton after applying
SnapNodes, which tends to leave
some quadrilaterals tailor-made for splitting along the
diagonal. As shown, heterogeneous elements (highlighted with fat
lines) are surrounded by two types of
elements (two blue elements
and two magenta elements for each case) and
the material boundary is closely following their diagonals.
Skeleton is shown Figure 6.109.