Formula for City Combat Strength?

renton555 said:

I think more accurately its what era your civ is. In fact, I think the era is the biggest influence to the number.

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Vajrajina said:

Yupp. A newly founded Atomic era city starts with almost 100 strength.

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renton555 said:

If I'm reading that correctly it's pretty close to "by era" because the eras subdivide the tech tree into 1/8 portions (i think?) and each two eras is 25% of the tech tree so it looks like your cities get a huge bump in combat strength roughly once you are in the medieval, industrial, and atomic eras respectively (and again technically once you have researched all techs, i suppose). I guess what I mean is that its easy to mistake it for era in common observation.

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AgressiveWimp said:

There's also a pantheon that effects it... Goddess of Protection, isn't it?

Look man, I don't know if you know anything about C++ or not - I don't - but these segments from the base game coding seems to be relevant:

Spoiler :

Code:

int CvCity::getStrengthValue(bool bForRangeStrike) const
{
	VALIDATE_OBJECT
	// Strike strikes are weaker
	if(bForRangeStrike)
	{
		int iValue = m_iStrengthValue;

		iValue -= m_pCityBuildings->GetBuildingDefense();

		CvAssertMsg(iValue > 0, "City strength should always be greater than zero. Please show Jon this and send your last 5 autosaves.");

		iValue *= /*40*/ GC.getCITY_RANGED_ATTACK_STRENGTH_MULTIPLIER();
		iValue /= 100;

		if(GetGarrisonedUnit())
		{
			iValue *= (100 + GET_PLAYER(m_eOwner).GetGarrisonedCityRangeStrikeModifier());
			iValue /= 100;
		}

		// Religion city strike mod
		int iReligionCityStrikeMod = 0;
		ReligionTypes eMajority = GetCityReligions()->GetReligiousMajority();
		if(eMajority != NO_RELIGION)
		{
			const CvReligion* pReligion = GC.getGame().GetGameReligions()->GetReligion(eMajority, getOwner());
			if(pReligion)
			{
				iReligionCityStrikeMod = pReligion->m_Beliefs.GetCityRangeStrikeModifier();
				BeliefTypes eSecondaryPantheon = GetCityReligions()->GetSecondaryReligionPantheonBelief();
				if (eSecondaryPantheon != NO_BELIEF)
				{
					iReligionCityStrikeMod += GC.GetGameBeliefs()->GetEntry(eSecondaryPantheon)->GetCityRangeStrikeModifier();
				}
				if(iReligionCityStrikeMod > 0)
				{
					iValue *= (100 + iReligionCityStrikeMod);
					iValue /= 100;
				}
			}
		}

		return iValue;
	}

	return m_iStrengthValue;
}

Code:

int CvCity::GetPower() const
{
	VALIDATE_OBJECT
	return int(pow((double) getStrengthValue() / 100, 1.5));		// This is the same math used to calculate Unit Power in CvUnitEntry
}

Code:

void CvCity::updateStrengthValue()
{
	VALIDATE_OBJECT
	AI_PERF_FORMAT("City-AI-perf.csv", ("CvCity::updateStrengthValue, Turn %03d, %s, %s", GC.getGame().getElapsedGameTurns(), GetPlayer()->getCivilizationShortDescription(), getName().c_str()) );
	// Default Strength
	int iStrengthValue = /*600*/ GC.getCITY_STRENGTH_DEFAULT();

	// Population mod
	iStrengthValue += getPopulation() * /*25*/ GC.getCITY_STRENGTH_POPULATION_CHANGE();

	// Building Defense
	int iBuildingDefense = m_pCityBuildings->GetBuildingDefense();

	iBuildingDefense *= (100 + m_pCityBuildings->GetBuildingDefenseMod());
	iBuildingDefense /= 100;

	iStrengthValue += iBuildingDefense;

	// Garrisoned Unit
	CvUnit* pGarrisonedUnit = GetGarrisonedUnit();
	int iStrengthFromUnits = 0;
	if(pGarrisonedUnit)
	{
		int iMaxHits = GC.getMAX_HIT_POINTS();
		iStrengthFromUnits = pGarrisonedUnit->GetBaseCombatStrength() * 100 * (iMaxHits - pGarrisonedUnit->getDamage()) / iMaxHits;
	}

	iStrengthValue += ((iStrengthFromUnits * 100) / /*300*/ GC.getCITY_STRENGTH_UNIT_DIVISOR());

	// Tech Progress increases City Strength
	int iTechProgress = GET_TEAM(getTeam()).GetTeamTechs()->GetNumTechsKnown() * 100 / GC.getNumTechInfos();

	// Want progress to be a value between 0 and 5
	double fTechProgress = iTechProgress / 100.0 * /*5*/ GC.getCITY_STRENGTH_TECH_BASE();
	double fTechExponent = /*2.0f*/ GC.getCITY_STRENGTH_TECH_EXPONENT();
	int iTechMultiplier = /*2*/ GC.getCITY_STRENGTH_TECH_MULTIPLIER();

	// The way all of this adds up...
	// 25% of the way through the game provides an extra 3.12
	// 50% of the way through the game provides an extra 12.50
	// 75% of the way through the game provides an extra 28.12
	// 100% of the way through the game provides an extra 50.00

	double fTechMod = pow(fTechProgress, fTechExponent);
	fTechMod *= iTechMultiplier;

	fTechMod *= 100;	// Bring it back into hundreds
	iStrengthValue += (int)(fTechMod + 0.005);	// Adding a small amount to prevent small fp accuracy differences from generating a different integer result on the Mac and PC. Assuming fTechMod is positive, round to nearest hundredth

	int iStrengthMod = 0;

	// Player-wide strength mod (Policies, etc.)
	iStrengthMod += GET_PLAYER(getOwner()).GetCityStrengthMod();

	// Apply Mod
	iStrengthValue *= (100 + iStrengthMod);
	iStrengthValue /= 100;

	m_iStrengthValue = iStrengthValue;

	// Terrain mod
	if(plot()->isHills())
	{
		m_iStrengthValue += /*3*/ GC.getCITY_STRENGTH_HILL_CHANGE();
	}

	DLLUI->setDirty(CityInfo_DIRTY_BIT, true);
}

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