GeoCity3D — OpenStreetMap 3D City Generator

GeoCity3D generates real-world 3D cities in Unity from OpenStreetMap data with a single click. Clean architectural maquette style with solid, volumetric geometry — ready for urban planning, visualization, and game prototyping.

Features

Solid Geometry

• Volumetric buildings — watertight sealed extrusions with roof caps, bottom caps, and proper normals
• Thick roads — top surface + side walls + end caps. No paper-thin strips
• Elevated bridges — detects OSM bridge tags, creates raised decks with railings and support pillars
• Rivers & waterways — linear waterways (rivers, streams, canals) rendered as wide water strips
• Area features — parks, water bodies, and forests with visible edge thickness

Environment

• Solid trees — grounded trunks with base disc + smooth sphere canopies, scattered in parks and along streets
• Parks & green spaces — detected from OSM landuse/leisure tags
• Water bodies — lakes, reservoirs, bays, riverbanks with distinct materials

Architectural Maquette Style

• Solid color materials — clean, professional look with no textures
• Double-sided rendering — geometry never appears see-through
• Shadow casting — all elements cast and receive shadows for depth
• Color palette — light gray buildings, dark charcoal roads, vibrant green parks, dark teal water

Real-World Data

• One-click generation — enter coordinates, set radius, click Generate
• OpenStreetMap — real building footprints, road networks, and land use via Overpass API
• Smart height estimation — uses building:levels, height tags, or estimates from building type
• Road width by type — motorways (12m), primary (10m), residential (6m), footways (2m)
• Raised platform base — city sits on a proportional pedestal like architectural models

Technical

• Floating-point precision — built-in OriginShifter for large geospatial coordinates
• Render pipeline agnostic — auto-detects URP, HDRP, or Built-in shaders
• No mesh leaks — uses sharedMesh throughout for edit-mode safety
• MeshColliders — accurate collision on buildings

Quick Start

1. Open the Demo Scene or create a new scene.
2. If starting fresh, go to GeoCity3D > Setup Demo Scene to initialize default materials.
3. Open the generator via GeoCity3D > City Generator.
4. Enter Latitude and Longitude of your desired location.
   • Example (Eiffel Tower): 48.8584, 2.2945
5. Set the Radius (e.g., 500 meters).
6. Click Generate City.

Troubleshooting

• "Download failed": Check your internet connection. The Overpass API might be temporarily unavailable or rate-limiting.
• Empty scene: The location might not have building/road data in OSM. Try a known city center.
• Jittery movement: Ensure the OriginShifter component is present. It centers the world to avoid floating-point errors.