Another way of doing planet generation

He's making a grid-style setup for a game more like Civ, but when you get down to it PA is using a distorted cube with brushes, features, and decals placed at vertices, so it's not all that different.

http://experilous.com/1/blog/post/procedural-planet-generation

Another fun fact: it's written in JavaScript, so if there was a way to import geometry and all types of placements, you could use this with PA.

Well you can easily write a json file that defines a map with even more settings per csg than you have ingame.