# SnapPea Options

The SnapPea options panel controls how Regina interacts with the SnapPea kernel. Regina includes part of the SnapPea kernel for certain geometric computations in the triangulation SnapPea tab.

The settings here are:

Diagnostic messages

  Specifies whether the SnapPea kernel should write diagnostic messages to the terminal.

  The SnapPea kernel sometimes sends out messages indicating what it is doing (such as “Computing hyperbolic structure . . .”). If this option is checked, all such messages will be written to the terminal from which you started Regina. If this is unchecked (or if you started Regina some other way, such as from a menu or taskbar), these messages will be suppressed.

Allow closed triangulations

  Specifies whether Regina is allowed to pass closed triangulations to the SnapPea kernel.

  This is disabled by default, since SnapPea is mainly designed to work with ideal triangulations only. However, if you know what you are doing then you can enable this option.

  Enabling this option does not mean that all closed triangulations will be passed to the SnapPea kernel. There are other constraints that must be satisfied—for instance, Regina will not send SnapPea a closed triangulation with more than one vertex.

  ### Caution

  Enabling this option might cause the SnapPea kernel to crash, which means you may lose unsaved work. This is because you are asking SnapPea to do something that it was not originally designed for. Please be sure that you know what you are doing, and please save regularly!