Update V1.2:
Fixed func_lookdoors to work in a future Garry's Mod update.

Update V1.1:
Added air nodes in the sky.
Fixed a nodrawed brush in a room with stairs.
Fixed the gramophone model in the house not rendering sometimes.
Turned the truss in the warehouse into a physbox.
Tried to fix a certain model turning invisible sometimes in multiplayer servers.

Initial addon creation.