[BTS] The Final and Definitive Truth about Diplomatic Modifiers

[gavenkoa]

I analyzed code of CvGameTextMgr::getAttitudeString - a string of green & red text when hover over the leader showing its attitude (diplomacy value).

Messages are defined in:

Civ4/Assets/XML/Text/CIV4GameTextInfos.xml
Beyond the Sword/Assets/XML/Text/CIV4GameText_BTS.xml

Code is in CvPlayerAI.cpp / CvDeal.cpp / etc:

CvPlayerAI::AI_getCloseBordersAttitude
TXT_KEY_MISC_ATTITUDE_LAND_TARGET: Our close borders spark tensions.

CvPlayerAI::AI_getWarAttitude
TXT_KEY_MISC_ATTITUDE_WAR: This war spoils our relationship.
iAtWarAttitudeDivisor = -5 & iAtWarAttitudeChangeLimit = 5
= max(turns / div, -limit) - 3

CvPlayerAI::AI_getPeaceAttitude
TXT_KEY_MISC_ATTITUDE_PEACE: Years of peace have strengthened our relations.
for ALL AIs: iAtPeaceAttitudeDivisor == 60 & iAtPeaceAttitudeChangeLimit = 1
= min(counter / div, limit)

CvPlayerAI::AI_getSameReligionAttitude
TXT_KEY_MISC_ATTITUDE_SAME_RELIGION: We care for our brothers and sisters of the faith
for ALL AIs: iSameReligionAttitudeChange == 1 & iSameReligionAttitudeDivisor = 10
iSameReligionAttitudeChangeLimit is in range [1:7]
if same religion then = change + 1 if we have holy city + min(turns / div, limit)

CvPlayerAI::AI_getDifferentReligionAttitude
TXT_KEY_MISC_ATTITUDE_DIFFERENT_RELIGION: We are upset that you have fallen under the sway of a heathen religion
for ALL AIs: iDifferentReligionAttitudeDivisor = -5 & iDifferentReligionAttitudeChangeLimit = -1
iDifferentReligionAttitudeChange is in range [-2:0]
if different religion then = change - 1 if we have holy city for state religion + max(turns / div, limit)

CvPlayerAI::AI_getBonusTradeAttitude
TXT_KEY_MISC_ATTITUDE_BONUS_TRADE: We appreciate the years you have supplied us with resources
for ALL AIs: iBonusTradeAttitudeDivisor = 50 & iBonusTradeAttitudeChangeLimit = 2
= min(counter / div, limit)

CvPlayerAI::AI_getOpenBordersAttitude
TXT_KEY_MISC_ATTITUDE_OPEN_BORDERS: Our Open Borders have brought our people close together.
iOpenBordersAttitudeDivisor = 25 & iOpenBordersAttitudeChangeLimit = 2
= min(counter / div, limit)

CvPlayerAI::AI_getTradeAttitude
TXT_KEY_MISC_ATTITUDE_TRADE: Our trade relations have been fair and forthright.
AI_getPeacetimeGrantValue
AI_getPeacetimeTradeValue
[grant + max(0, trade_me2you - trade_you2me)] / (met_counter + 1) / 5 LIMITED to [0:4]

CvUnit::gift
grant is changed on gifting unit: getProductionCost() / 5

CvTeamAI::AI_techTradeVal
    iCost = std::max(0, (getResearchCost(eTech) - getResearchProgress(eTech)));
    iValue = ((iCost * 3) / 2);
    iValue += (((iCost / 2) * (iPossibleKnownCount - iKnownCount)) / iPossibleKnownCount);
3/4 * percent_unknown_tech

CvPlayerAI::AI_cityTradeVal
300 + pop*50 + culture_level*200 + (pop*50+turns+100)*4*culture_percent/100

TXT_KEY_MISC_ATTITUDE_EXTRA_GOOD: Past events have brought our people together.
TXT_KEY_MISC_ATTITUDE_EXTRA_BAD: Past events have drawn our people apart.

In human words:

* resource gifting increases a counter every turn by a number of resources, bonus is counter / 50, but no greater than 2. Like 1 resource gives +1 after 50T, +1 = 2 after 100T, then stops changing.
* open borders increases a counter every turn, bonus is counter / 25, but no greater than 2. Like +1 after 25T, then +1 = 2 after 50T, then stops changing.
* meeting AI gives +1 once after 60T.
* trade value decreases by dividing on how many turns you met AI, bonus = value / turns but no greater than 4
* gifting a unit gives trade value 5 times less of unit's cost
* trade value of a tech depends on how unknown the tech, and 3/4 of the research cost
* gifting a newly built city gives roughly 300+50+200+(50+100)*4 = 1150 trade value. If you know AI even for 300T (end game??) 1150 / 300 ~= +4 diplomacy attitude!! Gifting a city is almost permanent +4.
* positive religion modifiers increases every 10T up to limit, negative decreases every 5T. See above analysis and consult XML files - the limits are different for every leader.

 

[Whisker]

Wow, I was not aware that gifting units counts towards trade value.

 

[gavenkoa]

Wow, I was not aware that gifting units counts towards trade value.

I wonder what use of it. Warrior cost is 15, gifting gives 15/5=3. IDK the value of 10 gold.

Anyway it is not possible to gift a Warrior to Tokugava for opening border because gifting happens inside open border...

Probably it is a micro optimization for missionaries, when you spread religion.

 

[sampsa]

Gifting units for diplo is very close to useless - you just don't get much diplo per . City gift OTOH gives massive diplo bonus per .

 

[AcaMetis]

I believe gifting units technically works better with units you cannot build and don't have a conventional production value, I.E. Great People, but realistically it's not something you're ever going to see make a difference one way or another. Even if you do end up in a situation where you I.E. give an AI a Great Prophet to build a Shrine you intend to conquer later, or a Great Engineer to try and manipulate UN elections by having that AI build the UN wonder itself.

 

[valergrad]

I like your scenarios of gifting units.
I believe the most common will be gifting missionaries to civ if you anyway want to spread religion into his cities?
It can save you up to 2 golds per turn and a give a little bit trade bonus apparently.

Previously I've only gifted units as a proxy war, when didn't want for some civ A take city from undeveloped civ B and at the same time wasn't ready to start war with civ A.
And sometimes you can gift workers if you don't need such big amount of them anymore.