[2.1.9] pipe circuit signal not showing 0 on empty pipe

[Maeximus]

What did you do?

connect signal to fuel pipe which is leading to thrusters

What happened?

pipe is getting empty due to speed control of spacecraft, but signal is still 1 while gui shows 0.00 for the piece of pipe where the circuit is connected to

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What did you expect to happen instead? It might be obvious to you, but do it anyway!

signal should switch to 0 at a sensible point

Does it happen always, once, or sometimes?

always, I also had another case where both pipe segment and pipeline showed 0.00 but signal still on 1

[Hurkyl]

The pipe isn't empty is it? It should have a trace, but nonzero, amount of fluid in it. A small enough number that it rounds to 0.00, but not actually zero.

Try using a pump to actually remove the fluid from the pipe segment.

I have no opinion on if and when the circuit signal should round down rather than round up.

[Harkonnen]

That's when showing +0 or even +0.00 would come in handy.

[gridstop]

It's critically important that the signal not drop to 0 until the pipe segment is completely, truly empty. This used to be the behavior pre-2.0 and it was awful, the new fluid system fixed it by rounding up fluids below 1 to 1. Without it there's no way to detect what is in a fluid network even though it's still locked to a fluid type. Systems that depend on switching fluids intentionally can get blocked. It's a little more recoverable now because of how pump input filters work, but it would still be really bad to reintroduce this.

[Rseding91]

Thanks for the report however this is working as intended. Since circuit networks treat "0" as no-signal it must be 1 until the fluid is truly gone. For the purpose of fluids circuit networks treat > 0 && <= 1 as 1.