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func_nav_connection_blocker
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 class hierarchy
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| CFuncNavConnectionBlocker |
func_nav_connection_blocker is a brush entity available in 
Left 4 Dead 2. It prevents vertical connections to be made through its volume during navmesh generation.
Example
It's used only in c5m5_bridge. You can see its brush like in the pictures below when convar nav_show_connectionblockers is 1 while round starts and the brush uses tools/toolstrigger texture. Blue lines in the pictures are connections going from upper areas to the lower ones.
