Factorio Forums

Ralfinator wrote: ↑

Fri Jul 31, 2020 7:51 am

We are also having a lot of trouble with this in our base. We have a single train stop where trains where 3 different liquids arrive (controlled by LTN but that's actually not terribly relevant), and we need to enable only the right pumps. Sadly, the pumps shut off before the tank is empty, due to the rounding.

Given that the devs see problems with always rounding up, I am not sure what the best solution here would be. Some ideas:
- Somehow make it so that containers can never contain fractional amounts of liquids.
- Have a setting at the train stop / fluid tank that controls rounding up vs down.

darkfrei wrote: ↑

Fri Jul 31, 2020 10:24 am

Why fluids cannot be integer as items?

mrvn wrote: ↑

Fri Jul 31, 2020 1:38 pm

darkfrei wrote: ↑

Fri Jul 31, 2020 10:24 am

Why fluids cannot be integer as items?

Because the math for moving liquids through pipes would become verry rough if it had to limit itself to integers. An output of 50 liquid for example would not even travel 10 pipe length because it takes 55 units to maintain a one unit gradient for that length. Fluids wouldn't get far enough and be stop-and-go like a traffic jam on a highway.

Optera wrote: ↑

Sat Aug 01, 2020 9:15 am

mrvn wrote: ↑

Fri Jul 31, 2020 1:38 pm

darkfrei wrote: ↑

Fri Jul 31, 2020 10:24 am

Why fluids cannot be integer as items?

Because the math for moving liquids through pipes would become verry rough if it had to limit itself to integers. An output of 50 liquid for example would not even travel 10 pipe length because it takes 55 units to maintain a one unit gradient for that length. Fluids wouldn't get far enough and be stop-and-go like a traffic jam on a highway.

With the current unfinished/broken fluid mechanics.

Oxygen not Included for example has more robust and easier to understand fluid mechanics that would work perfectly fine with integer numbers.

Actually that you are using LTN helps avoid this problem. Some while ago I wrote a patch for LTN so the yellow constant combinator on the LTN Stop outputs a -1 signal for any fluid to unload. If you connect your pumps to the yellow constant combinator (not the train stop) and set them to '<liquid> != 0' then they will do the right thing for unloading.

Ralfinator wrote: ↑

Sun Aug 09, 2020 8:36 pm

Actually that you are using LTN helps avoid this problem. Some while ago I wrote a patch for LTN so the yellow constant combinator on the LTN Stop outputs a -1 signal for any fluid to unload. If you connect your pumps to the yellow constant combinator (not the train stop) and set them to '<liquid> != 0' then they will do the right thing for unloading.

I had in the past checked that combinator to see if it would output the requested amount on an LTN requester (similar to how it does the same on an LTN provider, so I thought that would make a lot of sense -- not just for fluids), and it did not -- I saw no output at all from the yellow combinator. I just tried again, still no luck. Are you sure that patch is working? This is with LTN 1.13.10.

            elseif c.type == "fluid_count" then
              if (c.condition.comparator == "=" and c.condition.constant == 0) then
                --train expects to be unloaded of each of this fluid
                fluidInventory[c.condition.first_signal.name] = -1
              elseif c.condition.comparator == "≥" then
                --train expects to be loaded to x of this fluid
                fluidInventory[c.condition.first_signal.name] = c.condition.constant
              end
            end