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N2 buildup fix attempt. Putting this into separate commit in case it's not wanted.

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- Right now, air consists of 20% O2 80% N2 (approx.). Breathing takes O2 and turns it into CO2. CO2 gets scrubbed. Pressure drops, vents refill with air which again contains 80% N2 20% O2.
- This means that only 20% of breathed-out oxygen is replenished. Rest is replaced by N2. In large areas, such as Bar, with many mobs this can eventually lead to dangerous atmosphere status.
- This fix, while OOCly slightly unrealistic handles this issue by turning both O2 and N2 into CO2. Tested in CE's office with 5 human mobs without active scrubbers. Air lasts for 2~ hrs. Larger areas of course last significantly longer.
This commit is contained in:
Atlantiscze
2014-08-13 11:24:12 +02:00
parent ce2e34f5e5
commit e8a7b58aff
1 changed files with 21 additions and 13 deletions
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34
code/modules/mob/living/carbon/human/life.dm
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@@ -459,7 +459,6 @@
var/safe_toxins_max = 0.005
var/SA_para_min = 1
var/SA_sleep_min = 5
var/inhaled_gas_used = 0
var/breath_pressure = (breath.total_moles()*R_IDEAL_GAS_EQUATION*breath.temperature)/BREATH_VOLUME
@@ -518,7 +517,6 @@
// The hell? By definition ratio > 1, and HUMAN_MAX_OXYLOSS = 1... why do we even have this?
adjustOxyLoss(min(5*ratio, HUMAN_MAX_OXYLOSS))
failed_inhale = 1
inhaled_gas_used = inhaling*ratio/6
else
@@ -529,29 +527,39 @@
else
// We're in safe limits
inhaled_gas_used = inhaling/6
oxygen_alert = 0
var/exhale_amt = 0
switch(species.breath_type)
if("nitrogen")
breath.nitrogen -= inhaled_gas_used
exhale_amt = breath.nitrogen
breath.nitrogen = 0
if("phoron")
breath.phoron -= inhaled_gas_used
exhale_amt = breath.phoron
breath.phoron = 0
if("carbon_dioxide")
breath.carbon_dioxide-= inhaled_gas_used
exhale_amt = breath.carbon_dioxide
breath.carbon_dioxide = 0
else
breath.oxygen -= inhaled_gas_used
exhale_amt = (breath.oxygen + breath.nitrogen) // Haxy fix (see below)
breath.oxygen = 0
breath.nitrogen = 0
// Haxy fix - N2 buildup caused by breathing
// If you have room filled with breathing human mobs the oxygen level eventually reaches 0 even with vent.
// Our distro has 80% nitrogen and 20% oxygen (+-). However, humans take only part of this oxygen and convert it to CO2
// Basically, we change some oxygen into CO2, CO2 gets scrubbed, pressure drops a little, vents refill with N2 O2 mix.
// However, we didn't breath any nitrogen which eventually leads to O2 being mostly replaced with N2.
// This only happens with lots of mobs on one place, but may be actual for, for example, Dormitories.
// This fix causes mobs to turn all inhaled gas into CO2, which while hacky prevents this from happening.
if(!no_exhale)
switch(species.exhale_type)
if("oxygen")
breath.oxygen += inhaled_gas_used
breath.oxygen += exhale_amt
if("nitrogen")
breath.nitrogen += inhaled_gas_used
breath.nitrogen += exhale_amt
if("phoron")
breath.phoron += inhaled_gas_used
breath.phoron += exhale_amt
if("carbon_dioxide")
breath.carbon_dioxide += inhaled_gas_used
breath.carbon_dioxide += exhale_amt
// Too much exhaled gas in the air
if(exhaled_pp > safe_exhaled_max)