LOS Test
From GECK
How the Test Works
Test mode for Search Behavior. To use, select LOS Test from NavMesh menu, right click on a point to set a start for the search, then right click a second point to set a destination (where you think what you’re searching for is); it will then draw triangles green or red based on visibility (green triangles are seen from the start location, red are not) and will build a path to the best unseen location. Used for combat to search for enemies.