CityGen3D is a Unity editor extension for

automated creation of 3D scenes based on real world map data from OpenStreetMap

Creating a 3D city environment complete with terrain, roads, street lighting, railways, buildings, trees and other prefabs can be a very time consuming process.

It usually involves learning several different tools and getting them to work in sync, creating lots of meshes, and manually placing thousands of game objects and details.

Even before the creation of the scene, a lot of planning is required to design a believable city, which if you simply want to prototype an idea very quickly, can be a big hurdle to overcome, especially when working on your own or in a small team.

But not anymore!

CityGen3D was developed to automate a lot of this work for you allowing you to create a city scene with just a few clicks of the mouse.
The resulting scene is detailed enough for first person rendering making it prefect for both game development and simulation.

So how does it work?

CityGen3D is a Unity Editor extension and requires no additional coding. Simply specify a location using latitude and longitude and real world map data will be downloaded and parsed by CityGen3D within Unity ready for scene generation.


CityGen3D is highly customizable for use in any project or art style. Simple hook up your own materials and prefabs using the interface, before CityGen3D generates your scene using a combination of procedural geometry & texturing, terrain deformation, and prefab spawning.

Key Features

☑ Worldwide coverage from OpenStreetMap.
☑ Easy to use interface with no coding required.
☑ Import real world terrain
heightmaps from NASA.
☑ Perlin Noise heightmaps.

☑ Automatic terrain texturing for different map surfaces.
☑ 2D map editing functionality for custom map creation.
☑ Automatic generation of
roads using a combination of procedural geometry, terrain modifications, and decals.
☑ Automatic levelling of terrain for roads and buildings.
☑ Easy to use terrain smoothing.
☑ Procedural
buildings with auto LOD levels.
☑ Spawning of
roadside prefabs such as street lighting.

☑ Instantiate entities such as post boxes, litter bins, and power towers.
☑ Mesh extrusion for features like railways, fences and guard rails.
☑ Define different biomes to have
trees and terrain details automatically applied to terrains.
☑ Water meshes for oceans and lakes.
☑ Built-in support for large environments with scene streaming and world origin shifting.
☑ Some operations multithreaded for faster generation of environments.
☑ Selection of textures & prefabs included and all setup for demonstration in Unity’s built-in renderer.
☑ Fully customizable to use your own textures and meshes, so useful for all types of project.
☑ Call CityGen3D functions from script using the advanced API.
☑ Ever expanding documentation that is freely available to view from the website before purchase.

©2020 CityGen Technologies Ltd

CityGen Technologies Ltd is a company registered in England & Wales #12697475.

VAT Registration #351987563.


CityGen3D is a Unity Editor extension and is distributed with a small selection of 3D models and textures to demo the features of the tool.

Media on this website, such as screenshots & videos, may include third-party assets not included in CityGen3D for illustrative purposes.


CityGen3D is not sponsored by or affiliated with Unity Technologies or its affiliates.

"Unity” is a trademark or registered trademark of Unity Technologies or its affiliates in the U.S. and elsewhere.


Map Data © OpenStreetMap contributors.