Talking about voxel engines, I used to follow the progress of a minecraf-like game which, among its particularities, offered a spherical world, thanks to a clever deformation of a large cube. IIRC it also offered basic physics (falling trees). I'd like to check out where this game is at now, but I totally forgot the name. Does it ring a bell for anyone?
It was a neat little game where you essentially strand on a planet and start building your own city until you can build a rocket to leave the planet and explore the rest of the solar system. Then build a city on the moon so you can create custom spacecrafts to go even further into space.
