Hi Meg,
Unfortunately, doing this is not a trivial process but I have been able to do it on my end.
The existing traffic light enumeration in the Level Blueprint of the US City Block Scene only has three states, 0,1, and 2 corresponding to the three states of Red, Yellow and Green respectively. You need to use the Unreal Editor to customize the scene and add a fourth enumeration where all the lights are off. Please follow all the steps closely at the link I sent you above (they are broken down into 4 different pages).
At a high level, these are the steps:
- First search for the "Enum-TrafficLightsState" in the Content Browser the USCityBlock map, then modify it to add a new Enum for an All Lights Off state.
- Then, in a few places in the Level Blueprint where this enum is used, you need to replicate the logic used for the other colors for this new enum. In one of the places, you can specify the color used for this enum as well.
- Finally, you'll need to either hard code or modify the logic in the "Simulation 3D Traffic Light Controller" block to send the new enum to Unreal during simulation.
Hope this helps and please reach out if you need more help.
Nishan
