Binary Worlds

About Descensor Engine:
Descensor is the real-time procedural world generation engine.

Since 3D models are created automatically by the engine, Descensor worlds can be as big and detailed as required. For instance, you can have a galaxy model, descend down to a planet, approach a continent, a region, a city, enter a building and watch a flower in a sitting-room.

http://www.BinaryWorlds.com