trigger_hierarchy
trigger_hierarchy is a brush entity available in all 
Source games since 
Alien Swarm. It is also available in 
Black Mesa.
Contents
Entity description
A trigger volume that can will check if any of trigger's children pass a secondary filter.
Keyvalues
- Child Filter Name
(childfiltername)<filter> - Filter to use to see if activator's children trigger me. See filter_activator_name for more explanation.
- Delay Before Reset
(wait)<integer> - Amount of time, in seconds, after the trigger_multiple has triggered before it can be triggered again. If set to -1, it will never trigger again (in which case you should just use a trigger_once).
Inputs
TouchTest- Tests if the trigger is being touched and fires an output based on whether the value is true or false.
Outputs
OnTrigger- Fired whenever the trigger is activated.
OnTouching- Fired when the TestTouch input is true (something is touching the trigger.)
OnNotTouching- Fired when the TestTouch input is not true (nothing is touching the trigger.)
 Bug:Spamming crouch jumps in a trigger can randomly fire OnStartTouch.  Confirm:Is it a Multiplayer issue only?
 Warning:This includes entities which are deleted while inside the trigger. In this case !activator will be invalid.Warning:OnEndTouch can fire before OnStartTouch under certain circumstances where both are fired on the same tick and each have the same delay.  Fix:Add a slight delay to OnEndTouch.Bug:Spamming crouch jump in a trigger can randomly fire OnEndTouch. Confirm:Is it a Multiplayer issue only?
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