Citigen is an add-on that transforms basic flat planes into expansive 3D city environments in real-time. The procedural generation system automatically populates the scene with streets, traffic lights, trees, and buildings suitable for mid-range and aerial drone-style shots. For close-up rendering, users can integrate their own detailed building models into the add-on's asset library.

The tool includes built-in camera rigs tailored for drone-like movements, such as point of interest (POI) and course locks, bypassing the need to manually animate complex camera paths. All included assets, shaders, and textures are custom-built from scratch. Depending on the purchased version, additional features include exporting layouts to Unreal Engine 5 with collisions, as well as automatic generation of animated crowds and vehicle traffic across streets and overpasses.