Andras Schmelczer
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| title | description | date | projectPeriod | thumbnail | tags | role | stack | outcome | audience | links | ||||||||||
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| A Unity City Where Bad PLC Code Made Cars Crash | 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. | 2026-05-01 | July-August 2018 |
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Simulation author |
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Visible consequences for an otherwise abstract PLC challenge | technical |
Most security challenges punish wrong answers with a red "incorrect." This one punished them with car wrecks, and people learned faster. A PLC cybersecurity event in the summer of 2018 needed something visceral; I built a small Unity city where the traffic lights were driven by a REST API and contestants wrote the control logic.
All decisions ran on the server and got broadcast to clients. The harder problem wasn't the simulation; it was making the broadcast fault-tolerant on conference Wi-Fi without flooding it. I 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. It felt clever at the time and dated horribly. Skip that part.