Hmm, interesting. Are you thinking in the direction of planets? I’ve seen this one guy working on something like that; randomly generating a set amount of planet meshes, and when you get closer to the planet it transitions over to being a terrain landscape. Texture-wise I would use big textures for the planet meshes, and as you get closer (inside the atmosphere) the textures would transition to HD ones with normalmaps etc. I haven’t tried this, but there should be some info out there? 