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Andras Schmelczer 2026-05-25 13:11:58 +01:00
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---
title: A Unity City Simulation for a Cybersecurity Challenge
description: A client-server Unity simulation where REST-controlled traffic lights made mistakes immediately visible through crashes.
date: 2026-05-01
projectPeriod: 'July-August 2018'
thumbnail:
src: ./_assets/city-simulation.jpg
alt: Screenshot of a Unity traffic simulation.
tags: ['simulation', 'systems']
role: Simulation author
stack: ['Unity', 'C#', 'REST API', 'Blender']
outcome: A visual context for a PLC-focused cybersecurity challenge
audience: technical
links: []
---
I simulated a city where car crashes were more frequent than usual.
The state of the traffic lights could be changed through a REST API. Drivers followed the instructions of those lights, so if a mistake was made, collisions appeared in the simulation. There was also support for displaying tweets on a HUD.
The project was the context for a cybersecurity challenge about PLCs. Contestants could see the effect of their work immediately, as crashes.
The architecture was server-client. Every decision of the agents was calculated server-side, and the real challenge was broadcasting those decisions in a fault-tolerant way on minimal bandwidth.
It was built in Unity with C# as the scripting language. I also made the models and animations in Blender.