Update Evasion / Hit Chance formula with 0.3 changes (#1228)

Formulas were changed and provided here https://www.reddit.com/r/PathOfExile2/comments/1n2tefy/comment/nb8wufb/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

Also adds the function for Deflection but doesn't take it into account for defense calcs yet

Co-authored-by: LocalIdentity <localidentity2@gmail.com>

Author: LocalIdentity

src/Modules/CalcDefence.lua

@@ -32,8 +32,16 @@ function calcs.hitChance(evasion, accuracy, uncapped)
 	if accuracy < 0 then
 		return 5
 	end
-	local rawChance = ( accuracy * 1.5 ) / ( accuracy + evasion ) * 100
-	return uncapped and m_max(round(rawChance), 5) or m_max(m_min(round(rawChance), 100), 5)	
+	local rawChance = ( accuracy * 1.25 ) / ( accuracy + evasion * 0.3 ) * 100
+	return uncapped and m_max(round(rawChance), 5) or m_max(m_min(round(rawChance), 100), 5)
+end
+-- Calculate Deflect chance
+function calcs.deflectChance(evasion, accuracy, uncapped)
+	if accuracy < 0 then
+		return 5
+	end
+	local rawChance = ( accuracy * 0.9 ) / ( accuracy + evasion * 0.2 ) * 100
+	return uncapped and m_max(round(rawChance), 0) or m_max(m_min(round(rawChance), 100), 0)
 end
 -- Calculate damage reduction from armour, float
 function calcs.armourReductionF(armour, raw)

src/Modules/CalcOffence.lua

@@ -2290,14 +2290,14 @@ function calcs.offence(env, actor, activeSkill)
 		local more = skillModList:More("MORE", cfg, "Accuracy")
 		local moreVsEnemy = skillModList:More("MORE", cfg, "Accuracy", "AccuracyVsEnemy")
 
-		local enemyDistance = env.modDB:Sum("BASE", nil, "Multiplier:enemyDistance") / 10 or 20
+		local enemyDistance = env.modDB:Sum("BASE", nil, "Multiplier:enemyDistance") / 10 or 25
 		local enemyDistanceCapped = m_max(m_min(enemyDistance * 10, data.misc.AccuracyFalloffEnd), data.misc.AccuracyFalloffStart)
 		local modValue = m_floor(data.misc.MaxAccuracyRangePenalty * calcLib.mod(skillModList, cfg, "AccuracyPenalty"))
-		local accuracyPenalty = 1 - ((enemyDistanceCapped - data.misc.AccuracyFalloffStart) / 100) * modValue / 100
+		local accuracyPenalty = 1 - ((enemyDistanceCapped - data.misc.AccuracyFalloffStart) / (data.misc.AccuracyFalloffEnd - data.misc.AccuracyFalloffStart)) * modValue / 100
 		local accuracyPenalties = {}
-		local distances = {2, 5, 9, 12}
+		local distances = {2, 5, 9}
 		for _, distance in ipairs(distances) do
-			accuracyPenalties["accuracyPenalty" .. distance .. "m"] = 1 - ((distance * 10 - data.misc.AccuracyFalloffStart) / 100) * modValue / 100
+			accuracyPenalties["accuracyPenalty" .. distance .. "m"] = 1 - ((distance * 10 - data.misc.AccuracyFalloffStart) / (data.misc.AccuracyFalloffEnd - data.misc.AccuracyFalloffStart)) * modValue / 100 -- Fix
 		end
 
 		output.Accuracy = m_max(0, m_floor(base * (1 + inc / 100) * more))

src/Modules/Data.lua

@@ -168,7 +168,7 @@ data.misc = { -- magic numbers
 	SuppressionEffect = 50,
 	AvoidChanceCap = 75,
 	AccuracyFalloffStart = 20,
-	AccuracyFalloffEnd = 120,
+	AccuracyFalloffEnd = 90,
 	MaxAccuracyRangePenalty = -data.characterConstants["accuracy_rating_+%_final_at_max_distance_scaled"],
 	ArmourRatio = 10,
 	NegArmourDmgBonusCap = 100,