Logic relay (Source 2)

Source Engine

Source 2

logic_relay is a point entity available in all Source 2 games. It acts as a message forwarder and can be disabled to prevent forwarding outputs. Useful as an intermediary between one entity and another for turning on or off an I/O connection, or as a container for holding a set of outputs that can be triggered from multiple places.

After a logic_relay is triggered, it cannot be triggered again until all of its outputs are fired. This is useful for when a relay has a sequence of delayed outputs that shouldn't be repeated until the sequence is finished. This behavior can be disabled by setting FastRetrigger to true.

Keyvalues

Name (targetname) <string>[ Edit ]

The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g. parentname or target).
Also displayed in Hammer's 2D views and Entity Report.

See also:  Generic Keyvalues, Inputs and Outputs available to all entities

Start Disabled (StartDisabled) <boolean>

Stay dormant until activated (with theEnableinput).

Trigger Once (TriggerOnce) <boolean>

Deletes the logic relay after firing an OnTrigger Output or a connected OnSpawn output

Fast Retrigger (FastRetrigger) <boolean>

Without this, the logic_relay will wait until all inputs connected to OnTrigger have fired before retriggering

Pass through caller (PassthroughCaller) <boolean>

If set, this logic_relay will be ignored by !caller in downstream IO connections. Instead, the previous caller in the IO chain will be found by !caller.

Inputs

Enable

Allows the relay to fire the OnTrigger outputs after being disabled.

Disable

Prevents the relay from firing OnTrigger outputs in response to Trigger inputs.

Trigger

Trigger the relay, causing its OnTrigger output to fire if it is enabled.

Toggle

Toggle the relay between enabled and disabled.

CancelPending

Cancel any events fired by this relay that are currently pending in the I/O event queue

Bug:Using CancelPending on itself breaks the Service Queue which leads to a crash.  [todo tested in ?]

Outputs

OnSpawn

Fired when the relay is spawned. If the relay is set to only trigger once, it will delete itself after firing this output.

Note:Every level load (including save loads!) triggers this output, unless "Fire once only" is checked.

OnTrigger

Fired when the relay is triggered. If the relay is set to only trigger once, it will delete itself after firing this output.