Nuclear targets

[makif130289]

Hi, could I set primary targets for AI to drop nukes on ? I don't want AI to waste his nukes on useless targets. In my recent test game, US nuked East Timor.

 

[MartinBG]

In DH Full?! Are sure there was not a big enemy army concentration there?

Nuke AI has been revised in Darkest Hour and some of the old nuke AI parameters have new meaning.

NukeStrikeTolerance is used against target countries IC. If IC is less then this value, then the country is considered not worthy to be be nuked.
NukeStrikeDesirability is used as a modifier on the final "target province score". If it is set to 0 the country will never use nukes. If set too high the country will use nukes more often.

 

[makif130289]

Martin, where can I find these modifiers ? It is not in DH Full, you are right AI is choosing much better targets in DH Full.

 

[MartinBG]

These are set in air_marshal section in AI files.
Luckily most AI files do not have that defined and (nearly) all countries use just 4 switchable AI files:
ai\air_ground.ai
ai\air_naval.ai
ai\air_strategic.ai
ai\air_supremecy.ai

 

[makif130289]

These are set in air_marshal section in AI files.
Luckily most AI files do not have that defined and (nearly) all countries use just 4 switchable AI files:
ai\air_ground.ai
ai\air_naval.ai
ai\air_strategic.ai
ai\air_supremecy.ai

I searched US_36 ai file of DH Full to find NukeStrikeTolerance and NukeStrikeDesirability modifiers but couldn't locate them. If there is any example, it would be great.

 

[MartinBG]

Check the files I listed above.

Here is air_ground.ai

# Air AI File For Ground Bombings as priority
# bomber is now obsolete and NOT USED AT ALL replace and use Air Marshal instead

air_marshal = {
min_mission_strength_org = 0.5 #0.2
icxdayscostfactor = 8.0 # How to value true industrial cost when calculating expect causalties
manpowercostfactor = 80.0 # How to value manpower cost when calculating expect causalties
destructionriskthreashold = 0.2 # when to fear a divisiopn might be destroyed

# desirability is a multiplier used when calcualting the mission desirability
airsuperioritydesirability = 60.0
groundattackdesirability = 40.0
inderdictiondesirability = 40.0
logisticalstrikedesirability = 0.0
runwaycrateringdesirability = 0.0
strategicstrikedesirability = 0.0
installationstrikedesirability = 0.0
navalstrikedesirability = 15.0
portstrikedesirability = 1.0
convoyraiddesirability = 1.0

# tolerance is the required kill:loss ration expected to do
# mission, 2.0 accept twice the losses of your enemy, 0.5 accept half
airsuperioritylosstolerance = 1.5
groundattacklosstolerance = 1.5
interdictionlosstolerance = 2.5
logisticalstrikelosstolerance = 0.1
runwaycrateringlosstolerance = 0.1
strategicstriketolerance = 0.5
installationstriketolerance = 0.5
navalstriketolerance = 1.5
portstriketolerance = 1.5
convoyraidtolerance = 1.0

# efficency is a tweakable param to adjust according to how
# much actual damage comes from doing this mission (not to be confused with desirability)
logisticalstrikeefficency = 0.01
runwaycrateringefficency = 0.01
strategicstrikeefficency = 0.01
installationstrikeefficency = 0.01

taskforcetype = { name = "Air Superiority" desiredratio = 0.500 rangeweight = 10.000 airkillpowerweight = 2000.000 hardkillpowerweight = 0.000 softkillpowerweight = 0.000 navalkillpowerweight = 0.000 strategickillpowerweight = 0.000 transportcapacityweight = -1000000.000 airvulnurabilityweight = -1.000 surfacevulnurabilityweight = 0.000 idle = yes reorganize = yes air_superiority = yes }
taskforcetype = { name = "Soft Bombing" desiredratio = 0.250 rangeweight = 10.000 airkillpowerweight = 0.000 hardkillpowerweight = 0.000 softkillpowerweight = 2000.000 navalkillpowerweight = 0.000 strategickillpowerweight = 0.000 transportcapacityweight = -1000000.000 airvulnurabilityweight = 0.000 surfacevulnurabilityweight = -1.000 idle = yes reorganize = yes interdiction = yes ground_attack = yes }
taskforcetype = { name = "Hard Bombing" desiredratio = 0.200 rangeweight = 10.000 airkillpowerweight = 0.000 hardkillpowerweight = 2000.000 softkillpowerweight = 0.000 navalkillpowerweight = 0.000 strategickillpowerweight = 0.000 transportcapacityweight = -1000000.000 airvulnurabilityweight = 0.000 surfacevulnurabilityweight = -1.000 idle = yes reorganize = yes interdiction = yes ground_attack = yes }
taskforcetype = { name = "Strategic Bombing" desiredratio = 0.000 rangeweight = 10.000 airkillpowerweight = 0.000 hardkillpowerweight = 0.000 softkillpowerweight = 0.000 navalkillpowerweight = 0.000 strategickillpowerweight = 2000.000 transportcapacityweight = -1000000.000 airvulnurabilityweight = -0.500 surfacevulnurabilityweight = -0.500 idle = yes reorganize = yes logistical_strike = yes runway_cratering = yes strategic_bombardment = yes installation_strike = yes interdiction = yes ground_attack = yes }
taskforcetype = { name = "Naval Bombing" desiredratio = 0.050 rangeweight = 10.000 airkillpowerweight = 0.000 hardkillpowerweight = 0.000 softkillpowerweight = 0.000 navalkillpowerweight = 2000.000 strategickillpowerweight = 0.000 transportcapacityweight = -1000000.000 airvulnurabilityweight = 0.000 surfacevulnurabilityweight = -1.000 idle = yes reorganize = yes naval_strike = yes port_strike = yes convoy_air_raiding = yes }
taskforcetype = { name = "Airlift" desiredratio = 0.000 rangeweight = 10.000 airkillpowerweight = 0.000 hardkillpowerweight = -2000.000 softkillpowerweight = -2000.000 navalkillpowerweight = 0.000 strategickillpowerweight = -2000.000 transportcapacityweight = 1000000.000 airvulnurabilityweight = -1.000 surfacevulnurabilityweight = 0.000 idle = yes reorganize = yes airborne_assault = yes air_supply = yes }

nukestriketolerance = -35.0000
nukestrikedesirability = 50.0000
}

EDIT:
Just re-checked my notes and the code. It seems there was yet another revision. Here is how it works currently:

- nukestriketolerance is used as starting value in Nuke evaluation - higher it is, more often the AI will use nukes. It is recommended to be set a bit under 0.0 to order AI to nuke bigger enemy core provinces. Good values: -50 to -20
- nukestrikedesirability is used as before (multiplier on the final value if it is > 0.0). Good value seems to be about 50.0. If set to 0.0 or less AI will not use nukes.

 

[korodikrisz]

Actually, with the last patch of DH Full, USA still nukes some insane provinces. Especially when Germany receives supremacy in Europe and Africa - they bomb Indonesia, North Africa, Belgium, Denmark, Berlin at least 5 times. By 1952-55 nothing happens at any fronts, only USA keeps sending her nukes...

 

[makif130289]

Check the files I listed above.

Here is air_ground.ai


EDIT:
Just re-checked my notes and the code. It seems there was yet another revision. Here is how it works currently:

Thanks Martin, there are very helpful. By the way, I realized that nuke damage is also repaired too. In HOI2, nukes leave residual damage, I think this is removed ?

 

[MartinBG]

No, it is not. All province structures, MP (and IIRC resources too) max levels can be reduced permanently on nuking. There is a random chance involved. Current levels for resources/buildings are usually set to 0.

 

[makif130289]

No, it is not. All province structures, MP (and IIRC resources too) max levels can be reduced permanently on nuking. There is a random chance involved. Current levels for resources/buildings are usually set to 0.

I saw 3 consecutive nukes without any residual damage. In fact, infra levels of the provinces repaired very quickly. I want to make nukes more deadly. Is that random chance is moddable too ?. I would like to increase it.

 

[MartinBG]

No, it is not.