To generate the terrains of Oemfoeland, I use Simplex noise. A noise function gives always the same result for a given set of coordinates. You can do a lot of interesting things with this noise. With some tweaking on the numbers, you get landscapes like these:
These landscapes are very promising, I lost some time myself exploring this endless world. It’s very addicting! It’s an infinite sea with islands, coasts, bays, grasslands and mountains. Now it’s time to add some real content and gameplay. The next big thing on my list is physics. Now you just fly through the world without any collision detection or gravity.