I was wondering, is it possible to generate "on the fly" massive high poly terrains from a heightmap like they do in world machine or terragen, where it acts as a bumpmap but actually generates a high res model where it is close to the player? Trying to make a high quality flight simulator of sorts, but even a 500x500 terrain file seems to be too polygonal and not real enough with a large map. Any ideas? Also spherical terrains, possible or not?