What it says on the tin; this is mainly about pipes, pumps, gas mixers, and gas splitters. “Side” is relative and I don’t know which side is meant by the current labelling system. (Is the “side” port the left side or the bottom side? And so on.) Having numeric labelling also may help with teaching atmos to other players, so you can explain it more clearly; i.e. “you always want the input, which is 1, connected to the output of this pump, which is 2 on that object, so that the gas will flow continuously.” This is less roundabout than trying to explain “main” and “side” and if we ever get more atmos fluid logic items, it may make it easier to convey what they do.
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iirc, all side inputs are arrows pointing inwards.
The 2 arrows that line up point forward, and the one that does not is the side one.
Most of the things you’re talking about have some kind of indicator on the sprite. Mixers and filters have arrows, pneumatic valve has a ‘mark’ on the control input, output side of pumps have a red mark, etc. That said, I do think that these marks aren’t explained in the description of each item’s inspection well.
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