[irrlichthn]

I programmed that. I also wrote that CopperLicht library. So feel free to ask about that on the CopperLicht forums as well if you are using it anyway.

It is nothing really complicated: I created a deterministic randomizer class, and generating the worlds 3D geometry based on each squares coordinates as random seed. Terrain is currently based on a simple sin/cos function, buildings are built from blocks like minecraft does it. See the third Copperlicht tutorial in its documentation on how to create own geometry and stuff.