First time i saw frontier elite i thought wow you can land on the planet.
Question is what kind of game engine has oolite...
1] The player has landed on the planet ( planetfall )
2] The view changes, the player sees the planet surface ( the planet surface is an entity, a height field, a 3d model )
3] The Sun /stars are shown as background, the planet surface is coloured as per current sunlight
4] The player rides/walks on this entity, should be some interaction between gravity and player movement
5] On the surface entity there should be some buildings/mines, something to do
6] The explorable space is limited by the size of the planet surface boxmodel
Landed cobra just for size