Ai debug los

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A console variable 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