Osmundi — Real Cities in Your Game Engine

Features

Everything you need to build city games

From OSM data to playable game — buildings, streets, water, terrain, weather, NPCs, vehicles, and more.

⛪

3D Buildings

Correct heights from OSM tags, 10 roof shapes, wall colors from building:colour/material tags, windows, balconies, and building parts for landmarks.

🌳

10 Tree Shapes

Round oaks, columnar poplars, weeping willows, spreading plane trees, palm trees, cone pines, and more. Species inferred from OSM genus tags.

🌎

Terrain Elevation

Real-world elevation data from OpenTopoData. Gaussian-smoothed terrain mesh with roads and buildings that follow the terrain surface.

🌄

Animated Water

Vertex-displaced waves with fresnel reflections, sun sparkle, and shimmer. Stencil-based rendering ensures water is always visible.

🌆

Day/Night Cycle

Realistic sun position from geographic coordinates. Sunrise/sunset sky colors, street lamp glow halos, lit windows, vehicle headlights and taillights.

☁

Weather System

Clear, cloudy, light rain, heavy rain, storm with lightning, fog, and snow. Rain particles, wet street reflections, dynamic fog, and thunder audio.

🚗

Vehicles & Traffic

5 procedural vehicle types. Arcade driving physics. AI traffic with road-type speed limits, obstacle avoidance, and intersection stops.

🚶

Pedestrian NPCs

Procedural humanoid models with random appearance. Walk between destinations via A* pathfinding. Flee from approaching vehicles. LOD system.

🎨

4 Visual Styles

Default realistic, Illustrated/Parisian with mansard roofs, Neon Cyberpunk with glow strips, and Pencil Drawing with edge detection and cross-hatching.

Game Modes

Ready-made game templates

Pick a template and start playing immediately, or create your own. Full game systems are created automatically.

🎯

Open World

GTA-style: walk, drive, explore. Vehicles, NPCs, traffic, day/night cycle, weather, ambient audio.

🏁

Racing

Draw a route on the map, race with checkpoints and timer. AI opponent with speed variation and turn braking.

🚶

Walking Simulator

Explore the city on foot. Building info popups when nearby. Photo mode with free camera (P key).

✈

Flight Simulator

Arcade flight over the city. Cockpit view (V key), auto-leveling, throttle control. Terrain-following ground height.

Runtime API

Built for developers

Full runtime API for building custom game logic on top of the imported city.

Spatial queries, pathfinding, spawn points

Query buildings, find paths, generate spawn points, detect zones, and convert coordinates — all at 60fps.

✓ Building queries by position, type, amenity, height
✓ A* pathfinding on the street network
✓ Spawn points on streets, sidewalks, rooftops, parks
✓ Zone enter/exit events
✓ Geographic coordinate conversion
✓ Minimap rendering with streets, buildings, water
✓ Remappable input bindings

// Find the nearest restaurant
var city = OsmCity.Instance;
city.BuildSpatialIndex();

var results = new List<SpatialQueryResult>();
city.SpatialIndex.FindByTag(
    "amenity", "restaurant", results);

// Navigate to it
city.BuildStreetGraph();
var path = city.StreetGraph.FindPath(
    player.position, results[0].WorldPosition);

Debug.Log($"Distance: {path.TotalLength:F0}m");

// Spawn NPCs on sidewalks
var spawn = OsmSpawnUtility
    .GetRandomSidewalkSpawn(city);
Instantiate(npcPrefab, spawn.Position, spawn.Rotation);

Platforms

Multi-engine support

Same city data, multiple game engines.

Unity 6

Full-featured plugin with URP rendering, editor window with map preview, 4 game modes, visual styles, and complete runtime API. Production ready.

Godot 4

Editor plugin and standalone app. Buildings, streets, water, trees, terrain with custom shaders. Day/night cycle, weather, player controller. Also available as a standalone app on Steam.

CLI

Command-line tool for batch processing. Import cities, export to OBJ and Minecraft Java Edition. Useful for automation, CI/CD pipelines, and headless servers.

Build a GTA in your town in 30 minutes