Create traffic lights
The Half-Life 2 resources already provide a model of a signal light, this tutorial will explain how a dynamic traffic light can be set up using inputs and outputs.
required Entities
- a
prop_dynamicwith the following keyvalues:
- World Model = props_c17\Traffic_Light001a.mdl
- Disable Shadows = Yes
- Collide with world = Not solid (necessary when you want to place the lights inside the model or very close to it)
- three
point_spotlightsplaced at roughly the right position near the model
- one
logic_auto
- two
logic_relays.
I/O setup
The input and output logic will define how long each light will be visible, this example will use the following durations:
- red and green - 30 seconds
- yellow - 3 seconds
Entity names
The targetname keyvalue defines the name of the entities, the three point_spotlights should use the following names respectively: "greenLight" "redLight" "yellowLight". The first logic_relay will be named "traffLightRelay1" and the second one "traffLightRelay2".
Outputs
The logic_auto requires the following output:
| My Output | Target Entity | Target Input | Parameter | Delay | Only Once | |
|---|---|---|---|---|---|---|
 |
OnMapSpawn | traffLightRelay1 | Trigger | 0.00 | Yes |
Add these outputs to the first logic_relay:
| My Output | Target Entity | Target Input | Parameter | Delay | Only Once | |
|---|---|---|---|---|---|---|
|
OnTrigger | yellowLight | LightOn | 28.00 | No | |
|
OnTrigger | redLight | LightOff | 30.00 | No | |
|
OnTrigger | greenLight | LightOn | 30.00 | No | |
|
OnTrigger | yellowLight | LightOff | 30.00 | No | |
|
OnTrigger | traffLightRelay2 | Trigger | 32.00 | No |
Note:This tutorial will use both logic_relay and trigger them one after anotherAdd these outputs to the second logic_relay:
| My Output | Target Entity | Target Input | Parameter | Delay | Only Once | |
|---|---|---|---|---|---|---|
|
OnTrigger | greenLight | LightOff | 28.00 | No | |
|
OnTrigger | greenLight | LightOn | 28.50 | No | |
|
OnTrigger | greenLight | LightOff | 29.00 | No | |
|
OnTrigger | greenLight | LightOn | 29.50 | No | |
|
OnTrigger | greenLight | LightOff | 30.00 | No | |
|
OnTrigger | yellowLight | LightOn | 30.00 | No | |
|
OnTrigger | redLight | LightOn | 32.00 | No | |
|
OnTrigger | traffLightRelay1 | Trigger | 32.00 | No | |
|
OnTrigger | yellowLight | LightOff | 32.00 | No |
Now the map can be compiled and the traffic lights should be working!
