I’m currently looking for a suitable skybox to use in a space sim
This pov-ray script thing sounds promising but like too much work.
I’ve installed pov-ray but never really bothered to use it.
Remarkably Terragen can’t do it, but here’s a nice terragen tutorial anyway, and another (Carol Brooksbank’s – from web archive)
Weird program but pretty cool nonetheless but its pay software and it makes a flat image not a box