Hi everyone, I was wondering if anyone could help me with creating a custom non-cube skybox? I've looked everywhere online and I am extremely confused. I don't want to just use a skybox that came with the game, I want to figure out how I can turn this image into a worldspawn dome skybox:
 

 
Here's the original link where I got this from (there's an interactive 3D model of what it's suppose to look like here): https://sketchfab.com/3d-models/free-skybox-space-nebula-fa5c19c4f7cc4525a24b99425bd520c8
 
 
I have Maya CoDTools and Blender CoDTools as well, I don't care which one I have to use, I just want to be able to create a skybox with the above image.
 
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My Problem using Maya:
I don't know how to use the .fbx file included in the sketchfab link above; When I import, I cannot see the sphere.
 
My Problem using Blender:
I don't know how to apply the texture above to the .fbx after importing.
 
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I also know nothing about UV mapping, so any information anyone has would be very useful to me.
 
 
If anyone can help, it would mean a lot to me! I've spent a lot of time researching and I can't figure it out.
 
Thanks!