I don't understand the gravity in this game

[badimo]

This seems odd.  The gravity is all veered to the right and leads to tremendous build-ups in sort of an exponential manner.

[Soulwind]

 Lighter gasses float up and to the left,  heavier gasses float down and to the right.  Just the way the gas movement works. 

[Giltirn]

Huh, that's interesting. I wondered why my electrolyzer room had a buildup of H2 in the upper-left corner; I always thought it was because of the position of the pump.

[Zarquan]

I think hes talking about the water?  Maybe the geysers.

Each tile is assigned one liquid. Liquid doesn't displace other liquid left to right, only vertically.  It's one of the quirks of the game's physics.

[badimo]

Few points of clarification:

1. I find it odd that the heavier gas travels to the right instead of just down; like there is a massive object to the right and the entire colony is on an angle to the center of the asteroid
2. Gas build-up is exponential; I have ~15 kg of chlorine and carbon dioxide and only a few tiles a way the pressure drops to ~2 kg; that isn't the way gravity works on Earth (although there is some pressure build-up)

[Soulwind]

 well maybe the asteroid is in close proximity to a dense celestial body

[Zarquan]

16 minutes ago, badimo said:

1. I find it odd that the heavier gas travels to the right instead of just down; like there is a massive object to the right and the entire colony is on an angle to the center of the asteroid

It's probably a simple error in the probabilities.  Like, there's a 50% chance of moving right and a 50% chance of moving left if it doesn't move right.  I don't think it's intended.

16 minutes ago, badimo said:

Gas build-up is exponential; I have ~15 kg of chlorine and carbon dioxide and only a few tiles a way the pressure drops to ~2 kg; that isn't the way gravity works on Earth (although there is some pressure build-up)

The thing is that pressure doesn't exist in ONI.   Not like it does on Earth.  The analogue in ONI is mass per unit area, which is definitely not the same thing.  In the real world, PV=nRT, where n is related to the number of molecules, not the mass.  Also, gas pressure is exponential with respect to what?  It's proportional to number of molecules and inversely proportional to volume.

There is also the fact 1 tile can only have 1 type of gas.  In the real world, gases mix.  If gases can't mix, such cases are impossible to avoid.  The main thing is that ONI has weird quantum rules.

[glenalec]

Coriolis forces?

[itsYiyas]

I think ONI has made some understandable sacrifices for the sake of being able to run on a normal PC. All in all, ONI physics are pretty interesting because the bugs and how people abuse / cope with them.

[Supraluminal]

2 hours ago, Zarquan said:

It's probably a simple error in the probabilities.  Like, there's a 50% chance of moving right and a 50% chance of moving left if it doesn't move right.  I don't think it's intended.

I have a half-formed suspicion that it is intentional as a way to ensure that gases don't random-walk back and forth on the same long, flat stretch for too long. Biasing their movement in one direction ensures that they fall down sooner rather than later.

Could easily be wrong, but that was the first thing I thought of when I saw the diagonal layering.

[andrough]

I think it's an error to only consider that one tile of 2kg oxygen above the high pressure chlorine/CO2.  I haven't tested, but it seems to me the air pressure is a bit like water pressure in game and is checking the pressure of the "body" of gas, e.g. all those other ~2kg tiles of oxygen above and around it that I assume are in your example @badimo.

As far as the gases moving left/right, I am thankful for the behavior.  It may make them a little easy to manipulate, but I hate to think of the mess of gases if they just moved vertically.  Limiting it to vertical only could also prevent the gases rising/falling like they should.

[Kasuha]

Regarding sloped gas layers, it's likely a statistical issue. We don't know how exactly is gas stratification and motion implemented in the game but for example if you make a program that will rendomly shift a point on a line with 30% chance that it will go right, and if it did not go right, 30% chance that it will go left - then it will be shifting right on average because the practical probability that it will go left will be only 70% of 30%, i.e. 21%.

Regarding liquid mountains, there are two things about it. First, there's just one element per tile in the game. So if there's 1 gram of water in a tile, it will still occupy the whole tile and nothing else can go into that tile until the water leaves it or gets destroyed. And since there's no pressure in the game, a full tile of crude oil will not push a puddle of petroleum out of the way so they can keep sitting quietly side by side, forming mountains of crude wrapped in thin layer of petroleum or water.

[PhailRaptor]

I remember in one of the Upgrades -- I think it was Tubular? -- they made an active effort to reduce the gas shift effect.  It used to be much, much worse.  It used to form at more of a 45 to 60 degree angle up from horizontal.  Now it's more of a 30 degree angle up.

[Kasuha]

25 minutes ago, PhailRaptor said:

I remember in one of the Upgrades -- I think it was Tubular? -- they made an active effort to reduce the gas shift effect.  It used to be much, much worse.  It used to form at more of a 45 to 60 degree angle up from horizontal.  Now it's more of a 30 degree angle up.

What's in the op's image is exactly how I remember it back from the Alpha (thermal update etc). I don't think it changed in any way. Things may vary with different buildings (walls) in the room and with different ways you add gases to the space.

Here's an image of it in comment from March, 2017

[PhailRaptor]

35 minutes ago, Kasuha said:

What's in the op's image is exactly how I remember it back from the Alpha (thermal update etc). I don't think it changed in any way. Things may vary with different buildings (walls) in the room and with different ways you add gases to the space.

Here's an image of it in comment from March, 2017

I can't even see the effect in those images...  Are you referring to the one with the Pufts, specifically?

I do distinctly remember it being an item in the patch notes for one of the Upgrades, and I know for a fact that it was after I started playing (Agriculture).  The base plan I build from hasn't changed in that time, but the way CO2 behaves in my bases has changed quite dramatically.  To the right of my right most Ladder column, I would rather quickly end up with CO2 filling first the corner, then half the level, then all the way to the Ladder column.  All the way up and down the Ladder column.  And always with that 45 to 60 degree angle.

That no longer occurs.  After ~200 cycles, where before my Storage level would have filled completely with CO2 on the right-most side, there's now only a small bit of it all the way in the corner.

[Oozinator]

When i rotate my display around 30°, gasses look fine!

[Yoma_Nosme]

I think the gasses need time to reach equilibrium. Gases in oni are like this Asian? board game where you have like 15 tiles on a 16 square board and you have to push them around for some time till it makes sense

[Lutzkhie]

i notice that too, most CO2 are gathered at the bottom on the right side of my base

[Yoma_Nosme]

Oni 100 B.C

[Lutzkhie]

oh thats what you mean, i owned one of that but not numbers, but images it was an 8x8 puzzle

[Kasuha]

3 hours ago, PhailRaptor said:

I can't even see the effect in those images...  Are you referring to the one with the Pufts, specifically?

I do distinctly remember it being an item in the patch notes for one of the Upgrades, and I know for a fact that it was after I started playing (Agriculture).  The base plan I build from hasn't changed in that time, but the way CO2 behaves in my bases has changed quite dramatically.  To the right of my right most Ladder column, I would rather quickly end up with CO2 filling first the corner, then half the level, then all the way to the Ladder column.  All the way up and down the Ladder column.  And always with that 45 to 60 degree angle.

That no longer occurs.  After ~200 cycles, where before my Storage level would have filled completely with CO2 on the right-most side, there's now only a small bit of it all the way in the corner.

You can see it at the top of this image: https://cdn.forums.klei.com/monthly_2017_03/58bc2188b436f_2017-03-0515_32_13-OxygenNotIncluded.png.15314c52223da2a5c1a40f0cc5022ff5.png

It's from the time when in the oxygen overlay, different non-oxygen gases had still different colors.4

Anotgher example can be found here:

It's pretty much still the same slope.

Edit: in case you can't see the thread, here's the image. It's from April 2017