Damage (EU2012)

Damage Function

Damage is defined through the following function in XGItemCards class, XComGame.upk file:

	{
		kItemCard.m_iBaseDamage = kWeapon.iDamage;
		kItemCard.m_iBaseDamageMax = -1;
		kItemCard.m_iBaseCritChance = -1;
		kItemCard.m_iCritDamage = -1;
		kItemCard.m_iCritDamageMax = -1;
 	}
 	// End:0x471
	else
	{
		minDamage = int(FMax(1.00, float(kWeapon.iDamage - 1)));
		maxDamage = int(FMax(1.00, float(kWeapon.iDamage + 1)));
		kItemCard.m_iBaseDamage = minDamage;
		kItemCard.m_iBaseDamageMax = maxDamage;
		kItemCard.m_iBaseCritChance = kWeapon.iCritical;
		minCrit = int(FMax(1.00, float(int(float(maxDamage) * 1.50) - 1)));
		maxCrit = int(FMax(1.00, float(int(float(maxDamage) * 1.50) + 1)));
		kItemCard.m_iCritDamage = minCrit;
		kItemCard.m_iCritDamageMax = maxCrit;
	}

Damage System

• Regarding the different numbers seen in the Armory info and the actual game values, it seems that the Base Damage range can vary, i.e. a weapon listed with a 9 damage can vary between 8 and 10 and you see the Maximum Damage listed onscreen during the game before firing.
• If the shot is a hit the game will then check to see its Critical Chance.
• If the Critical Chance roll is successful, the game will then calculate the Critical Damage.
• In addition, there are also specific Class perks that can increase Damage (both Base and Crit), such as:
  • Headshot (Sniper) +2/4/6 Damage to Sniper Rifle, depending on weapon tech value
  • Gunslinger (Sniper) +2 Damage to pistols
  • Shredder (Heavy) +33% Damage from all sources to the target
  • HEAT Ammo (Heavy) +100% Damage against robotic enemies(has been lowered to 50% damage in Enemy Within)
  • Mayhem (Heavy) +1 to +3 Damage, depending on the weapon tech level
  • Bring 'Em On +1 to +5 bonus Critical Damage, depending on the number of enemies
  • Killer Instinct +50% Critical Damage
• Damage is rounded down.
  • For example rocket to shredded target will do 6*1.33=7.98 -> 7 damage, and Mindfray to stimmed target will do 5*0.5 = 2.5 -> 2 damage.
• There seems to be a Damage cap (at least for explosives) - Rocket Launchers will deal 16 max damage using HEAT and Mayhem, regardless of using Shredder rockets or not.

Critical Damage

The game code that calculates Critical Damage is:

if(bCritical)
{
	iDamage += 1;
 	iDamage = int(float(iDamage) * 1.50);
	iDamage += class'XComEngine'.static.SyncRand(3, string(Name) @ string(GetStateName()) @ string(GetFuncName())) - 1;
	return iDamage;
}

• Critical Damage is simply calculated by increasing the iDamage (Base Damage) roll by a factor of 1.5 before applying the bonuses/penalties from abilities/perks.
• The range for the actual iDamage seems to be a random roll with a range of -1 to apparently the integer that precedes the Critical Damage value. Thus, Base Damage from an Assault Rifle can vary between 3 and 4 while with a Plasma Sniper Rifle it can vary between 8 and 12.

Damage Values

Weapon	Base Damage	Crit Damage
Pistol Pistol (III) Laser Pistol	1	2
Pistol Pistol (III) Assault Rifle Laser Pistol Laser Pistol (III) Plasma Pistol	2	3
Pistol (III) Assault Rifle LMG Sniper Rifle Shotgun Laser Pistol Laser Pistol (III) Plasma Pistol Plasma Pistol (III)	3	4
Assault Rifle LMG Sniper Rifle Shotgun Laser Pistol (III) Laser Rifle Plasma Pistol Plasma Pistol (III) Plasma Light Rifle	4	6
LMG Sniper Rifle Shotgun Laser Rifle Heavy Laser Laser Sniper Rifle Laser Scatter Plasma Pistol (III) Plasma Light Rifle	5	7
Laser Rifle Heavy Laser Laser Sniper Rifle Laser Scatter Plasma Light Rifle Plasma Rifle	6	9
Heavy Laser Laser Sniper Rifle Laser Scatter Plasma Rifle	7	10
Plasma Rifle Heavy Plasma Plasma Sniper Rifle Alloy Cannon	8	12
Heavy Plasma Plasma Sniper Rifle Alloy Cannon	9	13
Heavy Plasma Plasma Sniper Rifle Alloy Cannon	10	15

• Damage can vary between -1 and +1 of the value listed on the Armory. Maximum damage is listed during missions.
• The results for the other perks can be deduced from this table by calculating the corresponding additions, i.e. Gunslinger will add +2 to Pistol iDamage, Bring 'Em On will also add a variable number, while Shredder will add 33% to the end Damage value.
• Headshot adds +2/4/6 damage to Sniper Rifle shots, depending on its tech level.

Weapons Kill Table

• Based on the above model, the tables below indicate how many shots (Base or Critical) are usually required to take down the aliens.
• BASE = alien can be killed with 1 shot dealing average (non-critical) damage
• CRIT = alien requires either 2 base shots or 1 critical hit with close to maximum critical damage.

Classic

Weapon	Base Damage	Crit Damage	Max Damage	Critical Chance	Tier 1 (3-7 HP)	Tier 2 (8-13 HP)	Tier 3 (14+ HP)
Pistol	0-2	0-1	3	0
Pistol (III) Laser Pistol	1-3	0-1	4	10	CRIT	CRIT	CRIT
Laser Pistol (III) Plasma Pistol Assault Rifle	2-4	1-2	6	10 0 10	BASE	CRIT	CRIT
Plasma Pistol (III) LMG Sniper Rifle Shotgun	3-5	1-2	7	20 0 25 20	BASE	BASE
Laser Rifle Light Plasma Rifle	4-6	2-3	9	10	BASE	BASE	CRIT
Heavy Laser Laser Sniper Rifle Scatter Laser	5-7	2-3	10	10 30 20	BASE	BASE	BASE
Plasma Rifle	6-8	3-4	12	12	BASE	BASE	BASE
Heavy Plasma Plasma Sniper Rifle Alloy Cannon	8-10	4-5	15	10 35 20	BASE	BASE	BASE

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