Climbing out of water onto an object can cause the player to drown

[BrettMayson]

When playing on the map Prilivsko (Flooded), several players were drowning while on top of sheds, houses, etc.

I have found that Arma keeps ticking down the players oxygen when climbing out of the water onto objects, conditionally. We can consistently reproduce it on certain objects at certain positions, but it doesn't happen at all positions on the objects.

I think this is more of an Arma bug, but can only be reproduced using EMR, since you can't climb in vanilla.

I am just using this right now as a workaround, but unfortunately it creates a single frame flash for the players.

["emr_main_climbingEnd", { 
  [{ 
    params ["_unit"]; 
    if (getOxygenRemaining _unit < 1 && !underwater _unit) then { 
      private _pos = getPosASL _unit; 
      private _newPos = +_pos;
      _newPos set [2, -100];
      _unit setPosASL _newPos;
      [{ 
        params ["_unit", "_pos"]; 
        _unit setPosASL _pos; 
      }, [_unit, _pos]] call CBA_fnc_execNextFrame; 
    }; 
  }, _this, 1] call CBA_fnc_waitAndExecute; 
}] call CBA_fnc_addEventHandler;

[SceptreOfficial]

Are there any specific buildings or locations on that map I can test on? Thanks for the workaround. It may end up being the fix for now... Swimming transitions are tricky to work with from what I remember.

[BrettMayson]

We were testing with Old Plywood Shed (Medium), just above the water's surface, it can take a few attempts to find a position that reproduces it.

I was using this to monitor the oxygen, we found that underwater player is always correct, but getOxygenRemaining player will tick down anyway. Walking on the shed's roof at the same elevation does nothing, but walking from the high end to the short end will fix the issue and oxygen jumps back to 1.

[{
  systemChat format ["UW: %1, OX: %2", underwater player, getOxygenRemaining player];
}] call CBA_fnc_addPerFrameHandler;

My guess is that in the engine there is a check for "mouth above water" that is being skipped by the animation, and the negative elevation change fixes it, which is why walking down the slope or teleporting under the map / underwater and back removes the issue.