Func nav connection blocker

Template:L4d2 brush 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.

Navmesh generated without func_nav_connection_blocker

Navmesh generated with func_nav_connection_blocker

Example showing func_nav_connection_blocker working correctly even with rotated brush models