tetrahedra

Description

This element was used in the past to store all tetrahedra in a 3-dimensional triangulation. Since Regina 7.0, these tetrahedra are now stored directly within the tri element (which replaces the old packet element for triangulation packets), and each tetrahedron is encoded in a simplex element (as opposed to the tet elements described here).

A tetrahedra element stores the entire set of tetrahedra forming a 3-dimensional triangulation.

The total number of tetrahedra must be specified by the ntet attribute. The individual tetrahedra are numbered 0, 1, 2, etc., and their face gluings are described by the corresponding child tet elements. There must be precisely ntet child tet elements in total.

Attributes

Example

The following XML snippet represents a triangulation of a two-tetrahedron (1, 1, 2) layered solid torus.

<tetrahedra ntet="2">
  <tet> 1 78 1 78 -1 -1 -1 -1 </tet>
  <tet> 1 57 1 147 0 78 0 78 </tet>
</tetrahedra>