Logic relay

Source Engine

Source 2

logic_relay is a point entity available in all Source games.

Class hierarchy
CLogicRelay ↳CLogicalEntity ↳CServerOnlyEntity ↳CBaseEntity
logicrelay.cpp

It is a Output forwarder, which can be used to fire many outputs at once from just one input, or, by being disabled, to break an I/O chain. It can also be very helpful for organization and keeping you from having to edit MANY instances of the same outputs, as opposed to just one.

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 with the "Allow fast retrigger" spawnflag.

logic_relay combines the functionality of trigger_relay and multi_manager from GoldSrc. The older entities still exist in Half-Life: Source, but are deprecated.

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>

When disabled OnTrigger output won't fire

Flags

Only trigger once : [1]

Allow fast retrigger : [2]

Inputs

Trigger

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

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.

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 ?]

EnableRefire  !FGD

Automatically fired on a relay after any delayed outputs finish firing, allowing it to fire again.

TriggerWithParameter <stringRedirectInput/string> (only in )

Triggers the relay with a parameter, causing its OnTriggerParameter output to fire if it is enabled.

Outputs

OnSpawn

!activator = !caller = this entity
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

!activator = activator of Trigger input
!caller = this entity
Fired when the relay is triggered. If the relay is set to only trigger once, it will delete itself after firing this output.

OnTriggerParameter <stringRedirectOutput/string> (only in )

!activator = activator of TriggerWithParameter input
!caller = this entity
Fired when the relay is triggered with a parameter. If the relay is set to only trigger once, it will delete itself after firing this output.

See Also

• logic_case