how to autoGen scene of unity3D by OpenStreetMap data?

s title said, If I want to build a scene model of a district,only by hands will be impossible.
SomeOne advice me to use OpenStreetMap data,So any one know what’s approach or tools can autogen 3d model by osm data ? (I mean model can be finally used in Unity3D)

like world2XPlane. scenery generator for X-Plane.


(World2XPlane is an application and project to generate highly detailed scenery for the X-Plane flight simulator.
X-Plane is flight simulator software. They use OpenStreetMap data to create parts of their 3D scenery (such as roads) blended in with various other sources)

thanks in advance.

Maybe you can get some hints via ?