Newest updates for my big procedurally generated world, which is bigger than Earth. 5/20 I've decided to re-do everything so I can optimize it all better. :( 5/19 added surface terrain and made better caves 5/18 made thick and thin spots underground 5/17 random cave stuff (which is playable in the link below)
These caves are generated using Metaballs, which gave them a pretty unique look and made them generate quite fast. The surface terrain and the ores are also generated using Metaballs. The surface terrain is basically cut out using Metaballs, which gave the surface a unique look as well. The downside of using Metaballs for caves is that it is very difficult to make the caves last very long, compared to using something like Perlin noise.