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[Inn Dvergr]

I was wondering if I could grow outdoor crops underground, but with a hole to the outside above the crop to let sunlight in. Also, are glass floors a thing?

[Fleeting Frames]

Yes.

You can make glass block floors, but they are exactly as transparent as lead ones. Fortunately for farms, that does not matter: once a tile is exposed to sunlight and cold outside, it stays exposed - the only building in game that actually needs unobstructed path to open sky is windmill.

For seeing things on z-levels below, you need either grates, bars, downstairs or hanging windows - which have different levels of impassibility for non-light things, so use as appropriate.

[Thisfox]

Yeah, it works. I tend to put in a glass ceiling for roleplaying purposes, and call it a greenhouse. Totally impenetrable "outdoor" farming. Just be careful a tree doesn't spawn and go right through the bloody glass floor. Not sure if that still is a thing, but it was when multitile trees first arrived.

[PatrikLundell]

Saplings are blocked from maturation if the level above them is blocked, so a floor or tree branches will block them. Bridges, however, do not block saplings from maturing, which can result in unexpected blockage of passages.

My standard tactic is to channel out a 13*13 area and build a floor above. The area below the floor is then used for outdoor crops as well as a pasture and beehive and (quantum) refuse stockpile placement. Access tunnels are then dug to control access to the courtyard (the first tunnel has to be completed before the last tile of the roof is placed, of course).