ai_debug_los

ai_debug_los is a console variable available in all Source games. A cvar that is used to inspect what (apart from ordinary world brushes) blocks line of sight for NPCs. When active, these obstructions will be highlighted with white bounding boxes.

ai_debug_los 0

Do not highlight anything. (Default)

ai_debug_los 1

Highlights all things that currently block line of sight.

ai_debug_los 2

Highlights all things that can potentially block line of sight as well (like disabled brushes that can be enabled).

This variable is a cheat.

See also

• Visibility optimization
• Tool textures