How do I make a background?

Hi, I want to make a background in one of my levels. I cannot use skybox or skybox transform calculations because some mobile devices don’t support them. Because I know that the player will always look in one direction, the problem gets easeier. What is the best way to do a planar background?

If the player is always looking in one direction, this means they can’t look up and down, yes? Same thing with left and right.

I have no information right now of what kind of project you are working on, but knowing that we are constrained to one axis, you could probably just get away with a large plane with a material on it. They aren’t able to turn or anything, plus depending on how the camera is angled, along with set-dressing, they’ll see even less of the horizon. A skybox is really just a sphere/hemisphere with a material, yea? so if you’re constrained to one axis, you should really just need a plane I would think.

Yeah his view is restrained to one direction. But he can move left/right and up/down, so the background has to move with him (it’s space). Therefore a plane which fits the players viewport would be good…