Quadratic elements
Triangle generates meshes with quadratic subparametric elements if the
-o2 switch is specified.
Quadratic elements have six nodes per element, rather than three.
`Subparametric' means that the edges of the triangles are always
straight, so that subparametric quadratic elements are geometrically
identical to linear elements, even though they can be used with
quadratic interpolating functions. The three extra nodes of an
element fall at the midpoint of each edge.
In .ele files produced by Triangle
with the -o2 switch, each elements has six nodes. The first three
are the corners of the element, in counterclockwise order. The
next three are the nodes opposite the first three, respectively.
Return to Triangle home page.
jrs@cs.cmu.edu