Parallaxed Walls create an infinite space effect and are actually
quite simple to make. There is a demonstration of this effect in TUTORIAL.MAP
(on both sides of 'Walls B3').
Create your space sector and parallax the ceiling and floor.
Create a slightly smaller sector inside of your space sector and turn it into valid player space with Alt + S
.
Lower the ceiling of the outer sector until it touches the ground. This will give the illusion that the walls are parallaxed.
Use B
to block the
walls of your inner sector. Parallaxed walls can still be shot by
bullets, so the player should not be allowed to see them up close.