City Generator - Procedural City, Traffic & Crowd Simulation

A city is a number. City Generator builds the road network, the zoning, the buildings and the life that moves through them from a single integer seed. Change the seed and you have a different city. Change nothing and you have the same one, on every machine, every run.

Online Demo | View Online Documentation

Most city assets stop at the geometry. This one keeps going, because a city that does not move is a diorama.

WHAT ACTUALLY MOVES

• Traffic that obeys the road, not a spline. Cars follow lanes, queue nose-to-tail, change lanes with a proper gap check, indicate before they turn, sweep real arcs through junctions and hold at red.
• Signals with genuine phases. The all-red is long enough for the slowest pedestrian to finish crossing - the timing is derived from the crossing width and the walk speed, not guessed.
• Buses that run routes. They pull in at stops and open their doors while people board and get off.
• Pedestrians that behave like people. They keep to one side of the pavement, step around lamp posts and benches, wait at the kerb for the green man, and cross when they get it. About a third are not walking at all: sitting on benches, reading, waiting for a bus, talking or jogging.
• Animals and weather. Dogs on leads, stray cats that bolt when startled, birds that flock and land, rain, snow and a full day and night.

WHAT YOU GET

• 14 presets - Balanced, Manhattan, Suburbs, Downtown, Garden City, Old Town, Rush Hour, Waterfront, Freight Yard, Megacity, Village, Market Town, Farmland and Seaside. Each is a different city, not a different colour.
• Districts and civic areas - a main square with a fountain, parks, a hospital with an ambulance bay, a police station with a yard of patrol cars, car parks, a football pitch, a railway with level crossings, and a beach with loungers and a lifeguard hut on coastal maps.
• 77 hand-modelled props and vehicles - cars, vans, buses, bikes, trees by species, street furniture, buildings, people and animals. Every model sits in a library slot: drop your own prefab into a slot and the kit places yours instead, with no code change.
• A one-line CITY CODE that captures the seed and every setting, so a city can be copied, pasted and shared exactly.

THE DEMO SCENE

A complete playable demo is included, not a screenshot: every setting on a live panel, a minimap you can export as a PNG, a sound mix that follows the camera, and five ways to look at the city - free flight, walking, driving a car, third-person follow and an orthographic plan view. Five post-processing looks switch at runtime. The online demo above is that same scene in your browser.

BUILT TO BE TRUSTED

The generation logic is engine-free C# covered by 74,511 automated assertions that run outside Unity - the traffic model, the crowd, the layout rules and the signal timings are checked, not hoped for. The kit also ships the editor audits used to develop it: a driving probe that measures whether cars slide, teleport, leave the road or interpenetrate, a crowd probe for jitter and snapping, plus navigation, performance, audio and render audits.

Everything ships as source. Nothing is a black box, nothing phones home, and there are no third-party dependencies to install.

KNOWN LIMITATIONS

• Universal Render Pipeline only. The kit's shaders are URP and it will not render correctly on the Built-in pipeline.
• The demo scene uses Unity UI (uGUI) and the legacy Input Manager. The runtime kit itself needs neither - delete the Demo folder and nothing in the generator breaks.
• The art is a clean low-poly style with flat vertex colour, not photoreal scanned assets. It is meant to be shipped with, or replaced through the library slots.

REQUIREMENTS

Unity 6000.0 or newer, Universal Render Pipeline. Verified on Windows standalone (x86_64) and WebGL.

THIRD-PARTY CONTENT

None. This package contains no third-party fonts, images, audio, icons, shaders, DLLs, native binaries or third-party source code. Every one of the 77 models, all 4 shaders and all 75 scripts is an original work created for this package; see Third-Party Notices.txt file in package for details.

Support

szekipapa77@gmail.com