https://blogs.unity3d.com/2017/07/05/build-location-based-games-or-apps-with-the-newly-launched-wrld-unity-sdk/
https://www.wrld3d.com/apikeys/
https://docs.wrld3d.com/unity/latest/docs/api/
https://maps.wrld3d.com/
https://www.mapbox.com/help/unity-mesh-pt-2/
https://www.mantle.tech/gallery/
https://www.assetstore.unity3d.com/en/#!/content/66413
http://www.preliminal.com/mantle/
https://www.youtube.com/results?search_query=houdiny+city
https://www.mantle.tech/forum
https://wrld3d.com/3d-maps/mapping-data.#MappingData