Triangulation Options

The Triangulation options panel controls how Regina works with 3-manifold triangulations.

The settings here are:

Default top-level tab

Specifies which tab in the triangulation viewer will first appear when you open a triangulation for viewing.

Default skeleton tab

Specifies which sub-tab will first appear when you switch to the triangulation skeleton tab.

Default algebra tab

Specifies which sub-tab will first appear when you switch to the triangulation algebra tab.

Surface calculation threshold

Determines when the information on the triangulation surfaces tab is computed. If the number of tetrahedra is at most the given value, then Regina will compute surface-related information automatically. If the number of tetrahedra is larger, then Regina will not compute this information until you manually press the Calculate button.

Note that 3-sphere and 3-ball recognition might use a slighly lower threshold than the one you set here. This is because they rely on almost normal surfaces, which in the worst-case scenario are much slower to work with than normal surfaces.

Labels on face pairing graphs

If checked, Regina will label each node in the face pairing graph with the corresponding tetrahedron number.