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Andras Schmelczer 2026-05-26 08:28:37 +01:00
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src/content/posts/city-simulation-unity-traffic.md
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---
title: A Unity City Where Bad PLC Code Made Cars Crash
description: A REST-controlled traffic-light sim for a cybersecurity event. Bad PLC code showed up as car crashes — the most honest feedback loop I've shipped.
description: A REST-controlled traffic-light sim for a cybersecurity event. Bad PLC code showed up as car crashes, the most honest feedback loop I've shipped.
date: 2026-05-01
projectPeriod: 'July-August 2018'
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@ -19,7 +19,7 @@ A small city in Unity where the traffic lights were driven by a REST API. Contes
Three things are worth saying about it:
- **Visual feedback was the whole point.** Most security challenges punish wrong answers with a red "incorrect." This one punished them with car wrecks, and people learned faster.
- **Server-client, all decisions on the server.** Every agent's behaviour was computed centrally and broadcast. The harder problem wasn't simulation — it was getting the broadcast to be fault-tolerant on the conference Wi-Fi without flooding it.
- **Server-client, all decisions on the server.** Every agent's behaviour was computed centrally and broadcast. The harder problem wasn't simulation; it was getting the broadcast to be fault-tolerant on the conference Wi-Fi without flooding it.
- **Built it solo, including the models and animations in Blender.** Not a flex, just context for why everything's a little janky.
There was also a HUD overlay for tweets, which felt clever at the time and dated horribly. Skip that part.