====== Map line ======

A //line// is a [[map]] geometry construct composed of two [[vertex]]s (in the map coordinate space) and either one or two [[side]]s.

Lines describe the physical geometry of the world used by the play simulation for determining world and inter-object collisions and for interactive elements such as switches.

[[Sector]]s and [[polyobj]]s are composed of //lines//.

===== See also =====

  *  [[xg:line_type|XG line type]]