Background change in the same level

[MarceloDPG]

Is it possible to switch backgrounds in a level? (like in Quartz Quadrant or Flying Battery)

Or to code it in after a event, like in angel island when it gets set on fire.

[TrianglyRU]

Clear the background with bg_clear and then setup it again. You'll need to do that in a different object that checks if the player passes it by