Prop car alarm

Class hierarchy
CCarProp ↳CPhysicsProp ↳CBreakableProp ↳CBaseProp ↳CBaseAnimating ↳CBaseEntity

prop_car_alarm is a model entity available in Left 4 Dead series. This class is the same as prop_physics, but with special outputs used specifically for a car alarm, to be used with prop_car_glass for its glass.

This entity can sense people firing their weapons next to it and has outputs for that event. It will call a panic event the moment its assigned model is touched or damaged by Survivors, but then it will stop functioning like a car alarm and will effectively just be a prop_physics.

In Left 4 Dead 2 there is a Prefab of this car, to be used as func_instance, in sdk_content/mapsrc/instance/prop_car_alarm.vmf

Note:The Enable/Disable inputs will disable or enable the ability to trigger alarms. However, the prop_car_glass entity that goes along with this car will not be affected by this and needs to be disabled separately, by swapping it with a generic prop_dynamic using the default glass version for this car, which does not blink.

Tip:By default the alarm sounds for about 30 seconds, then fires the OnCarAlarmEnd Output. You can make this time longer by instead using an OnCarAlarmStart output which fires a relay after X amount of seconds, which will then fire whatever outputs OnCarAlarmEnd was firing.

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).

World Model (model) <model path>[ Edit ]

In-game 3D representation of the entity to display. This is the path to a MDL relative to the game's root directory. (128 character limit)

See also:  Generic Keyvalues, Inputs and Outputs that all model entities have available

Inputs

EnableDisable:

Enable / Disable

Enable/disable this entity from performing its task. It might also disappear from view.

SurvivorStandingOnCar

Activates alarm. Automatically sent when Survivor stands on or damages the car

Outputs

OnCarAlarmStart

!activator = !caller = this entity
Car alarm should go off

OnCarAlarmEnd

!activator = !caller = this entity
Car alarm has shut off

OnCarAlarmChirpStart

!activator = !caller = this entity
Warning chirp starts

OnCarAlarmChirpEnd

!activator = !caller = this entity
Warning chirp stopped

ConVars

Cvar/Command	Parameters or default value	Descriptor	Effect
car_alarm_chirp_distance	350
car_alarm_chirp_duration	1
car_alarm_chirp_interval	3
car_alarm_distance	750
car_alarm_duration	15

See also

• prop_physics