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r_drawclipbrushes is a CVAR used to display clip brushes (invisible walls) in the map. These brushes can block both players and NPC's.
|0||Default value, clip brushes are not rendered.|
|1||Only shows clip brushes' outlines. These outlines can be seen through walls.|
|2*||Shows clip brushes as properly rendered brushes in the level.|
*This option is only available on Source Engine 2007 and newer.
Clip brushes are colored to show what they block:
|Red||Blocks both players and NPC's.|
|Pink||Blocks players only.|
|Purple||Blocks NPC's only.|
The CVAR is often used for routing as you might need to see if there are any clip brushes blocking up a path or any that you could abuse to get to unintended places. Despite not being a cheat-protected command, you can not use this in a speedrun.