Full tank not full for logistics

[steinio]

Hello,

i've a setup which shows the fill level of my tanks.
If i set the 'full' lamp to light if level > 2499 the lamp gets never on although the tank shows full.
The connected pump with the same settings also never switch on.
2498 works indeed. Could be a rounding error.

The number is apprev. with 2.5k, better would be 4 digits for clearance.

Greetings steinio

[daniel34]

I think it has to do with the fluid handling of Factorio.
Storage tanks (or pipes for that matter) will fill very slowly if they are almost full.

I have a small lubricant production only for electric engines which uses 0.1 lubricant/sec but I produce 1 lubricant/sec in the chemical plant.
In between is a storage tank. It will stay between 2496 and 2498 amount. As soon as I disconnect the electric engine production it will slowly fill to the max, after ~3-5 seconds it goes > 2499 and ~15 seconds later it will stop at 2499.97.

I don't think this is a bug, as the fluid handling was probably done this way by design.
What stops you from using 2490 or 2475 as value? One could reasonably say the storage tank is as good as full at that value (2475 = 99% full).

You can check the amount of fluid in the storage tank with the following command while the entity is selected with the mouse:

Code: Select all

/c game.local_player.print(game.local_player.selected.fluidbox[1].amount)

[Rseding91]

I was about to say it wasn't a bug but now I don't know.

The fluid is stored as a floating point number. 2499.9024 fluid for instance.

The circuit network and conditions deal with integers.

The question is: should fluid when sent to the network as a number be rounded up or down.

If the first, then there's a bug, if the 2nd then there's no bug to fix.

[steinio]

I think it has to do with the fluid handling of Factorio.
Storage tanks (or pipes for that matter) will fill very slowly if they are almost full.

I have a small lubricant production only for electric engines which uses 0.1 lubricant/sec but I produce 1 lubricant/sec in the chemical plant.
In between is a storage tank. It will stay between 2496 and 2498 amount. As soon as I disconnect the electric engine production it will slowly fill to the max, after ~3-5 seconds it goes > 2499 and ~15 seconds later it will stop at 2499.97.

I don't think this is a bug, as the fluid handling was probably done this way by design.
What stops you from using 2490 or 2475 as value? One could reasonably say the storage tank is as good as full at that value (2475 = 99% full).

You can check the amount of fluid in the storage tank with the following command while the entity is selected with the mouse:

Code: Select all

/c game.local_player.print(game.local_player.selected.fluidbox[1].amount)

Hello daniel34,

well nothing stops me...
I use it as discribed by you as workaround. The question is, is 2500 > 2499 in the eyes of the game.

Greetings steinio

[DaveMcW]

The question is: should fluid when sent to the network as a number be rounded up or down.

I vote for natural rounding. floor(n + 0.5).

[Klonan]

Thanks for the report

The question is: should fluid when sent to the network as a number be rounded up or down.

I vote for natural rounding. floor(n + 0.5).

I believe this should be the case, round it to the nearest integer,
Since the only way to read super accurate fluid levels is with script,
And that combinators work with integers etc.

[kovarex]

Thanks for the report

The question is: should fluid when sent to the network as a number be rounded up or down.

I vote for natural rounding. floor(n + 0.5).

I believe this should be the case, round it to the nearest integer,
Since the only way to read super accurate fluid levels is with script,
And that combinators work with integers etc.

Yes, sounds reasonable, changed it for 0.12.32

[steinio]

Gooooood morning vietnam..

Sorry factorio guys but i have the feeling that i'm getting angry.

According to the 2nd latest changelog someone of your team had the need to fiddle with the topic of this thread again:

Code: Select all

Storage tanks connected to the circuit network will output floored fluid values instead of rounding them.

Does this change now with every new major version?

tank.png (299.94 KiB) Viewed 11606 times

You can see in the picture, that the tank never reach it's capacity of 2500.
The lamp should lit if water > 2499.

Please repair it again - forever.

Greetings steinio

[Klonan]

Gooooood morning vietnam..

Sorry factorio guys but i have the feeling that i'm getting angry.

According to the 2nd latest changelog someone of your team had the need to fiddle with the topic of this thread again:

Code: Select all

Storage tanks connected to the circuit network will output floored fluid values instead of rounding them.

Does this change now with every new major version?

tank.png

You can see in the picture, that the tank never reach it's capacity of 2500.
The lamp should lit if water > 2499.

Please repair it again - forever.

Greetings steinio

This is desired behaviour, set your combinator to 2490.

There is a solution in 0.15,
So you will have to trust us until then, that it is the right move

[steinio]

Oh man so much leap of faith - hopefully it pays off

[Smoovious]

Not that my vote matters, but if I had one, I would want to have the 5/4 rounding back. (even with multiplying fluid volumes by 10x).

Testing my 4 tanks together, for volume of 10,000 to see if they're full, and 0, to see if they're empty, just makes more sense to me than testing for 9,996.

Unless the circuit network will be switched to floating point... well, even then, I'd still want to 5/4 round to the last decimal place it would use.

My 0.02 monies worth.

-- Smoov

[GlassDeviant]

Not sure why this is showing up on my "unread posts" list, but...

I know this game is an OCD dream; however, there comes a point when rigid definitions of "full" and "empty" get in the way of a functional system. The fractional difference between 4990 units of heated water in a pair of tanks and 5000 units is real, but it's not going to make one bit of difference between survival and destruction when pumping it into an array of steam engines powering a wall of defensive lasers against an alien attack.

When you set your thermostat in your house, there is a limit to the precision of the setting.

Ask anyone with an engineering degree, precision has limits.

So while you can demand that tanks in a simulation game fill absolutely, totally full and notify you via the circuit network what it happens, does it really matter so much that you are able to avoid having to say "X > 2490" or did you just miss a dose of Paxil?

(sorry, a little melodramatic/exaggerated, but really...is it going to kill you to use 99.6% full instead of 100%? no offense intended, just injecting a little philosophy)

[steinio]

No... the real problem is, that the fundamental behavior has changed 3 times in the last year.

[impetus maximus]

i just adjust my numbers to get around the problem in question. [offtopic] how are you displaying those numbers?

[Rseding91]

No... the real problem is, that the fundamental behavior has changed 3 times in the last year.

The game didn't exist a few years ago

[steinio]

i just adjust my numbers to get around the problem in question. [offtopic] how are you displaying those numbers?

Sorry - it's SmartDisplay by binbinhfr: https://mods.factorio.com/mods/binbinhfr/SmartDisplay

[impetus maximus]

Sorry - it's SmartDisplay by binbinhfr: https://mods.factorio.com/mods/binbinhfr/SmartDisplay

ok thanks. looked vanillaish.