In case you need a complete sphere (
for a space ships game, for example,
you need to create two images, one for
a top semisphere and another for the
bottom semisphere.
There really is no need to jump though all the hoops. One can save themselves the trouble, use the perfectly suitable SM_SkySphere that comes with the engine, create a MID and you’re pretty much done.
Here’s an example dds for anyone who wants to test it out:
https://drive.google.com/file/d/1oHEryRZq8P9r0FiRGI3b6dtUfSOK-91j/view?usp=sharing