For a solar system simulation project I'm looking for a good (semi-accurate) set of textures to texture the skybox.
I've already found these http://paulbourke.net/miscellaneous/starfield/ and we implemented a quick skysphere instead of a skybox. But after testing we found out that the 2048x1024 resolution image was too low-res for our application, and we can't use the higher resolution version because of GPU limitations (we're developing this for a specific platform).
So we came up with using 6 separate 2048x2048 textures on a skybox to have everything look pretty. However I can't seem to find any solar system star textures that are made for a skybox.
So basically what I'm asking:
Does someone know where to find skybox textures for our solar system?
Alternatively, does someone know a free program to convert a spherically-mapped texture to 6 box-mapped textures?