GeoCity Forge – Real-World City Generator

Turn real-world map data into playable Unity cities.

GeoCity Forge is an Editor-first city generation toolkit for converting locally supplied OpenStreetMap PBF and supported GeoJSON data into editable, spatially tiled Unity environments.

Select an administrative boundary, import a lawful local dataset, and generate deterministic city geometry directly inside Unity. GeoCity Forge can create buildings, roads, paths, bridges, water, parks, land-use surfaces, vegetation, terrain-aware geometry, and runtime-ready tile prefabs without requiring an API key, paid map service, third-party account, or telemetry connection.

Full-city map data

Full-city generation requires an OpenStreetMap .osm.pbf extract, which is not bundled with the asset. Download a suitable country or regional extract from providers such as Geofabrik or the OpenStreetMap France extract server. GeoCity Forge can use an existing local file or download one from a direct HTTPS .osm.pbf URL. A detailed PBF Download Guide with provider links and example files is included.

Key features

• Import complete city boundaries from local .osm.pbf files
• Import standard and supported Overture-style GeoJSON
• Offline city search using a bundled public-domain index
• Generate tiled buildings, roads, bridges, paths, water, parks, and land use
• Deterministic procedural vegetation and semantic materials
• Game Ready, High Detail, Architectural Visualization, and Blockout presets
• Building and road batching for more manageable Unity hierarchies
• Building LOD generation and optional gameplay colliders
• Nearby authoring previews for working with large cities
• Scene View following with bounded tile residency
• Compact prefab export with a city manifest and attribution documents
• Ready-to-use bounded runtime tile loader
• Complete-city FullCity.prefab export for smaller cities, editing, and offline rendering
• Stable source IDs, retained source tags, provenance, confidence, and inference reporting
• Cancellation, staging, cache validation, and deterministic regeneration
• Custom material profiles for project-specific appearance
• Synthetic Basic District sample for an internet-free first run
• No API keys, accounts, paid services, or hidden analytics required

Important scope information

GeoCity Forge produces procedural city environments suitable for blockouts, simulation prototypes, visualization, and early gameplay. Procedural materials, inferred road widths, vegetation placement, elevations, and structural details are not surveyed real-world facts.

Version 1.0.1 does not provide exact landmark reconstruction, production traffic simulation, authoritative lane or turn graphs, NavMesh generation, tunnel interiors, HLOD, floating-origin support, or engineering-grade road geometry. Complex road junctions and malformed or overlapping source data may require manual cleanup.

Users are responsible for confirming that imported data and generated exports comply with the relevant dataset licence. GeoCity Forge preserves source attribution and provides guarded export workflows for supported data declarations.