Wardogs — Gameplay Effects Pipeline

Project: Kiyogitpy/wardogs-data-docs · Live site

How gameplay effects (GEs) and attributes work in Wardogs: weapon attachment modifiers, player movement and stance modifiers, skills, and the attribute store that also holds health. Companion to Wardogs_DamagePipeline_v2.md and Wardogs_VehicleDamagePipeline_v1.md.

Build: ++Wardogs+Live-CL-516586 · Engine: UE 5.7 · GAS fork: “BH” (Embark’s in-house GAS variant) · Native addresses are file RVAs in the restored executable (damage doc §11). Labels: Native (code, RVA cited, unreviewed decompiler output), SDK, Data, Open.

TL;DR

  • UBHGameplayEffect defines an effect: duration, stacking, modifiers, granted tags, requirement tags.
  • UBHGameplayEffectComponent carries the active effects and the attributes of an actor.
  • Attributes are records keyed by gameplay tag, each with a double base value and current value, replicated as a fast array. There are no game UAttributeSet subclasses. DefaultAttributes (TMap<FGameplayTag, float>) only holds initial values.
  • Current value = ((Base + ΣAdd) × (1 + Σ(Multiply − 1)) / D) × ΠMultiplyCompound + ΣAddFinal, unless an Override is active. Stacks scale each modifier linearly (§4.2, §4.4).
  • 338 GE_* classes ship in the SDK, all : public UBHGameplayEffect.
  • Damage does not go through effects. Character damage writes the Attribute.Gameplay.Health base value directly (DamagePipeline §10).

1. The core classes

1.1 UBHGameplayEffect (0x270 bytes)

SDK, BHGameplayEffects_classes.hpp:

Offset Field Type Notes
0x30 Duration float The Duration-indexed scalar returns 0 when this is 0 (§4.2); “−1 = infinite” is not verified
0x34 MaxStacks uint16  
0x36 StackDurationRefreshPolicy enum  
0x37 StackExpirationPolicy enum  
0x38 Modifiers TArray<FBHAttributeModifier> Dumper shows TArray<FNone_>; the element type is in §4.2
0x48 GrantedTags FGameplayTagContainer  
0x68 ApplicationRequirements FBHGameplayTagRequirements  
0xF0 OngoingRequirements FBHGameplayTagRequirements  
0x178 RemovalRequirements FBHGameplayTagRequirements  
0x200 Tags FGameplayTagContainer  
0x220 bAllowClientPredictedApplication bool Read by ApplyEffect (§5)
0x221 bAllowClientPredictedModification bool  
0x222 ClientInstigatedApplicationPolicy enum Read by ApplyEffect (§5)

1.2 UBHGameplayEffectComponent (0xCD0 bytes)

SDK. Inherits UBHGameplayPredictionComponent.

Offset Field Notes
0x288 DefaultAttributes TMap<FGameplayTag, float>: initial values only
0x378 per-attribute hook map Run by the base-value setter (§4.3)
0x3D8 AttributeReplication Fast array of FBHGameplayAttributeRepData
0x508 EffectContainer Active effects
0x998 TagSerializer_AllCounts  
0xB18 TagSerializer_ReplicatedOnly  
0xC98 NetworkPredictionWorldManager Pointer; its role in rollback is not traced

Functions (reflected names; native bodies where traced):

Function Notes
ApplyEffect(Effect, Stacks, CustomMagnitudes, Mode) Native 0x5227F20. Stacks is clamped to [1, MaxStacks] (MaxStacks 0 = 65535) by 0x522B1B0; every call creates a new instance (§5)
ApplyLocalEffect(…) “Client-only” is not verified
ModifyEffectCustomMagnitude, ModifyEffectStacks, RemoveEffect  
FindOrAddAttribute(Attribute, InitialValue, …) Native 0x522F8F0
SetAttributeBaseValue(…, Handle, newbase) Native 0x5236AF0, gated on a role check; calls the setter 0x5236E50. Used by the damage path through 0x52311D0 (§4.3)
ServerApplyEffect(request, SyncFrame) Thunk 0x521B800 runs a check (0x5236230, prediction-key fields and effect class) before 0x5236070
ServerModifyEffect, UpdateGameplayTag  

1.3 UBHGameplayEffectLibrary

Function Notes
GetValues(Handle, Base, Current, …) Reads base and current
ModifyBase(…) Native 0x523A560
SetBase(…) Native 0x523AB10
MakeLocalEffectHandle(…)  

1.4 UBHTaggedGameplayEffects

A data asset holding TMap<GameplayTag, FBHGameplayEffectPreset>. The preset’s Effect is a TSubclassOf (not a soft pointer), Stacks is int32, and CustomMagnitudes lists magnitude overrides. The soft class pointer belongs to a different struct, FBHGameplayEffectTaggedTableRow.GameplayEffect.

2. The effect catalog

SDK. 338 sdk/raw/GE_*_classes.hpp files, every class : public UBHGameplayEffect. Data: 332 distinct GE_*_C class names are referenced somewhere in the export. One of them, GE_GrantSkill_Lockpicking (from the Lockpicking feature’s DT_Skills_Lockpicking.json), has no SDK header, and eight SDK classes are never referenced.

Grouped by filename prefix. Each effect’s actual modifiers are on Gameplay Effect Values, exported from the paks: 341 packages, the 338 SDK classes plus GE_GrantSkill_Lockpicking, GE_Meta_ResourceChange and GE_MolotovBurning.

Prefix Count What the names show
GE_MAGZ_* 60 Magazine attachments
GE_FGRP_* 54 Foregrip attachments
GE_MUZL_* 47 Muzzle attachments
GE_SGHT_* 34 Sights and scopes
GE_Player_* 30 Movement, stance, weight, ghillie, jump and mantle modifiers (no stimulant, bleed or stun effects)
GE_Weapon_* 25 Aim time, equip speed, recoil, per-stance recoil
GE_MAG_* 15 Short-prefix magazines
GE_FGP_* 10 Short-prefix foregrips
GE_MZL_* 7 Short-prefix muzzles
GE_AK74_* 6 AK74-specific attachments
GE_Item_* 4 Three tac vests and UsageRateMultiplier
GE_4xElcanSpectr_* 4 4× Elcan sight
GE_Vehicle_* 3 FuelUsageReductionMultiplier, Health, ImpactReductionMultiplier
GE_Spotting_* 3 CustomDepthStencilValue, IncreasedSpottedTime, IncreasedSpottingDuration
GE_TankHelmet_* 2 Tank helmet
GE_Stanag_* 2 STANAG magazine
GE_RK6_* 2 RK6 foregrip (ID_RK6_Grip.json)
GE_PilotHelmet_* 2 Pilot helmet
GE_GrantSkill_* 2 Skill grants
GE_6xScope_* 2 6× scope

GE_Weapon_StanceRecoil_* is 21 classes: 7 weapon archetypes × 3 stances (Standing, Crouch, Prone).

3. The data presets

Data.

  • DA_CharacterEffectPresets: one row, GameplayCue.Door.Breach → GE_DoorBreach_C, 1 stack.
  • DA_DefaultPlayerEffects: one row, Skill.DoorBreach → GE_GrantSkill_DoorBreach_C, 1 stack. When it is applied (for example on spawn) is not traced.
  • DA_CharacterModifierState_StimulantEffects is not an effect catalog. It is a WDCharacterModifierStateDefinition: an FOV camera modifier (×1.05) gated on State.Player.Stimulant.UnlimitedTacSprint and ignored while State.Player.Vitality.Critical. It contains no GEs.

4. The attribute system

4.1 Attribute records

Native + SDK. At runtime each attribute is a record keyed by its tag, holding a double base value (record +0x28) and current value (+0x30) and its owning component (+0x18). Records replicate through AttributeReplication as FBHGameplayAttributeRepData {AttributeTag, double BaseValue @0x18, double CurrentValue @0x20}; the receive handler is 0x5233C00. DefaultAttributes supplies the initial floats.

Attribute tags come from the native tag initializers, for example Attribute.Gameplay.Health, Attribute.Gameplay.Health.Max, Attribute.Gameplay.Fuel and the vehicle part healths Attribute.Gameplay.Health.Engine, .Tail, .Tracks. No Attribute.Weapon.* tags exist.

4.2 Modifiers

SDK. Each entry of UBHGameplayEffect::Modifiers is an FBHAttributeModifier:

Field Type
Attribute (0x00) FGameplayTag
Operation (0x08) EBHAttributeModOp: Add, Multiply, Divide, MultiplyCompound, AddFinal, Override
Channel (0x09) EBHAttributeModChannel
Modifier (0x10) FInstancedStruct: one of FBHAttributeMod_Scalar, FBHAttributeMod_Attribute, FBHAttributeMod_SetByCaller
Filter (0x20) FBHGameplayTagRequirements

Native. The Scalar evaluator (0x522E960) switches on CurveIndexing (EBHAttributeScalarIndex): Fixed returns the plain value when no curve row is set, otherwise Value × Curve(0); StackCount evaluates the curve at the stack count; StackCountNRM uses the stack count normalised by the effect’s settings; Lifetime and Duration index by time (Duration returns 0 when the effect’s Duration is 0).

Stack scaling (0x522B7D0) then applies to each modifier’s magnitude m for n stacks: m' = (m − I) × n + I, with I = 0 for Add, AddFinal and MultiplyCompound and I = 1 for Multiply and Divide. It is skipped for Override and for Scalars indexed by StackCount or StackCountNRM, whose curve already uses the stacks. A modifier with 0 stacks is excluded. So n stacks of a ×1.1 Multiply give ×(1 + 0.1n), and n stacks of a MultiplyCompound v give v × n, not vⁿ.

The combining function is 0x522E5C0. The dirty-attribute flush 0x522C4F0 starts from the base value (+0x28), runs each channel block (record +0x40, stride 0x60) through it (via the default evaluator lambda 0x522A800), and writes the result through 0x5237050 into the current value (+0x30). The formula is in §4.4.

Re-evaluation. Each instance caches its modifier magnitudes (instance +0x58, or a heap array at +0x98). They are re-evaluated in two cases:

  1. When a backing attribute changes. An attribute-backed modifier (FBHAttributeMod_Attribute, vtable 0xAABC030, evaluator 0x522E760) depends on its backing attribute (slot 2). Whenever that attribute’s current value changes on the same component (0x5237050 → 0x5238840 → 0x5238A10), its magnitude is evaluated again, so it follows the backing attribute live.
  2. On the duration pass. 0x522D260, the pass that also handles duration expiry (§5), runs when the effect has a time-dependent modifier (an unreflected flag on the default object, +0x268). It re-evaluates the modifiers whose evaluator reports itself time-dependent (slot 3): a Scalar with a curve indexed by Lifetime or Duration (0x5230C80), or an attribute-backed one with bScaleByDuration set (byte +0x28, 0x178DF10). For attribute-backed modifiers this pass covers only bScaleByDuration.

A changed value is stored back.

4.3 Base-value writes

Native. The base setter 0x5236E50 runs the attribute’s base-value hook, stores the new base, and pushes it into AttributeReplication (0x52382E0) under a role check. Its direct callers are SetAttributeBaseValue (0x5236AF0), the library ModifyBase (0x523A560) and SetBase (0x523AB10), FindOrAddAttribute (0x522F8F0) and the replication handler (0x5233C00). No effect-apply function calls it, so modifiers feed only the current value; 0x522C4F0 recomputes it from the base after every base write (§4.4).

Hooks. The component keeps hooks per attribute in a map at +0x378. Each entry holds a base-value hook (registered through 0x5236990, run by the base setter) and a current-value hook (registered through 0x5236C70, run by the current-value setter 0x5237050). The setters pass the value to a hook as a float and take a float back, so a hooked value loses double precision. Three functions call the two registration helpers:

  • vehicle health sections: 0x533A750 clamps to [0, MaxHealth] (VehicleDamagePipeline §5.4);
  • character health (0x6B81CE0, role 3 only): virtual slot 161, which clamps to [0, MaxHealth + MaxOverhealHealth + MaxDecayHealth] for characters (0x6B17D20; at least 1 while bInvincible) and to [0, MaxHealth] otherwise (0x6B83270);
  • vehicle fuel (0x7666070).

No other path registers a hook: the two helpers have no other call or pointer reference, and the map insert (0x5223670, emplace 0x521FDE0) is reached only from them. No Attribute.Gameplay.Weapon.* attribute has a hook.

SetAttributeBaseValue is reached through two helpers:

  • 0x52311D0 adds a delta to the attribute’s stored value and calls it. Used by character damage (vitality 0x6B82520, DamagePipeline §10), Auth_Heal (0x6B83360), the vehicle fuel component and others.
  • 0x5236DE0, a convenience wrapper, used by ResetHealth (0x6B83560), Auth_DecreaseContainerAmount (0x6C66540), the character’s revive handler (0x6E75620, which writes Attribute.Gameplay.PreTipValue), the tipping component and vehicle weapon code.

4.4 Current value

Native (0x522E5C0). When any Override modifier is active, the first active one in the attribute’s Override list wins and nothing else counts. Otherwise:

Current = ((Base + ΣAdd) × (1 + Σ(Multiply − 1)) / D) × ΠMultiplyCompound + ΣAddFinal
D       = 1 + Σ(Divide − 1), or 1 when |D| ≤ 1e-8
  • The sums and the product run over the stack-scaled magnitudes (§4.2).
  • Multiply and Divide add up among themselves: ×1.1 and ×1.2 give ×1.3, not ×1.32. Only MultiplyCompound multiplies.
  • Only the Default channel exists (EBHAttributeModChannel has Default and COUNT), so every attribute has one block.
  • The per-operation arrays live in the attribute record at +0x40 + 0x60 × Channel + 0x10 × Op (element stride 0x20). An element counts only when its Filter passed (+0x18) and it has a magnitude (+0x10).
  • Each applied instance appends its modifiers to the end of the per-operation arrays (0x5227C20). Removing an instance swaps the last element into the freed slot (RemoveAtSwap, 0x52357B0). So “first in the Override list” is application order only until a modifier in that array is removed; after that, the order depends on the equip history. In the current data this changes no value: no loadout carries two different Overrides on one attribute.
  • The arithmetic is in doubles, but the magnitudes come from floats in the asset, so 0.7 enters as 0.699999988.

Example. VerticalRecoilMultiplier starts at 1.0 on every weapon (Weapons §4). With GE_FGRP_006 (×c 0.75) and GE_Weapon_StanceRecoil_AR_Prone (×c 0.7), one stack each: 1.0 × 0.75 × 0.699999988 = 0.5249999911. No weapon attribute has a hook (§4.3).

5. Application and prediction

Native (ApplyEffect, 0x5227F20). When the component’s role check (0x3CA8630) does not return 3, a local predicted instance is created only if a component flag (+0x280) is clear, Mode is not AuthorityOnly, and the effect’s bAllowClientPredictedApplication (+0x220) is set. It then goes to 0x5219AB0 when Mode is ClientInstigated and ClientInstigatedApplicationPolicy (+0x222) is Enable, otherwise to 0x5219C70.

Every ApplyEffect call creates its own instance: applying the same effect twice gives two instances, never one with more stacks. StackDurationRefreshPolicy is read only in 0x52317F0; StackExpirationPolicy is also read when a multi-stack instance’s duration ends (0x522D260), which removes the instance (ClearEntireStack) or takes one stack off through 0x52317F0 (RemoveSingleStackAndRefreshDuration).

These are code facts. What they mean for authority, and how rollback works, are Open; the doc makes no server-authority claim, and security questions go through SECURITY.md.

6. Gameplay cues

Native. Cues are handled by a separate component, UWDGameplayCueComponent (module WDGameplayCue), with multicast invoke RPCs. Not every cue comes from an effect: GameplayCue.Player.ReviveAlly is fired by a direct call (0x6E75620 → 0x4C45DC0).

7. Example: a scope attachment

Data. ID_6xScope.json lists GE_6xScope_C in AttachmentData.AppliedEffects, and GE_6xScope_MainSight_C per sight. From the effect export (Gameplay Effect Values): GE_6xScope sets Weapon.AdsZoomMultiplier = 3, adds 0.2 to Weapon.AimTime, and sets the zeroing range to 100–500; GE_6xScope_MainSight sets Weapon.AdsZoomMultiplier = 3.

Native. On equip, 0x6C9F1A0 applies the attachment’s AppliedEffects, and 0x6C9E190 the selected sight’s effects, to the weapon item’s own effect component (WDItemExtension_GameplayEffects +0xF0), one stack each, after removing that slot’s earlier handles. The calls come from 0x6C9D170, which is reached from SetPredictedAttachment, OnRep_ReplicatedAttachmentMap and a delegate bound in slot 159.

7.1 What applies to a weapon

These rules give a weapon’s final attributes for an attachment set. Weapon Attributes applies them to every weapon and attachment.

  • Base. The weapon item’s WDItemExtensionData_GameplayEffects.DefaultAttributes, installed into the item’s own component (OnRegister 0x6C692E0). The AimTime in WDItemExtensionData_RangedWeapon.DefaultAttributes never changes the base: it is installed later with overwrite off (0x6C9AFB0).
  • Effects on the weapon (the item’s component, +0xF0), one stack each:
    • every equipped attachment’s AppliedEffects;
    • the selected sight’s SightsData[name].AppliedEffects, where the name starts as S_Aim01 (0x6C90DE0, called at 0x6C91859; restored on every attachment change, 0x6C9DC7B) and changes only through CycleSights;
    • with an underbarrel bipod unfolded and not mounted, also its unfolded list (FWDBipodAttachmentData +0x138, 0x6C9F6E0); while mounted (SetBipodMounted, 0x6CA1AE0), 0x6C9F6E0 removes the unfolded lists and the Blueprint action B_Action_MountBipod applies MountedAppliedEffects (+0x158) to the weapon and MountedAppliedCharacterEffects (+0x168) to the character, one stack each, removing them on unmount. The native part is checked in the executable; the Blueprint part rests on a bytecode dump of B_Action_MountBipod;
    • the stance preset StanceGameplayEffects[stance], applied by OnStanceChanged (0x6C9A420, mode AuthorityOnly) with the preset’s stack count, which is 1 in all data.
  • Not on the weapon. AppliedCharacterEffects and the bipod’s +0x148 list go to the owning character’s component (WDMoverCharacter +0x740), following the equip state.
  • Evaluation. Each application is its own instance; the stacking policies act only in 0x52317F0 and on duration expiry (0x522D260), and weapon effects have no duration. Every modifier Filter is empty, and no weapon-related effect has requirements, a duration or MaxStacks. So every modifier counts with n = 1, and the §4.4 formula applies with no hook.
  • Data exceptions.
    • ID_MAGZ_065 and ID_MAGZ_066 list the same effect in AppliedEffects and AppliedCharacterEffects.
    • The stance maps are keyed by stance, and two use mismatched effects: ID_A91 maps Stand to AR_Prone (×c 0.7) and Crouch and Prone to AR_Standing, and ID_WEPN_037 maps Prone to AR_Standing.
    • Seven sight effects override MaxZeroingRange with the current MinZeroingRange (an attribute-backed modifier).

Attribute-backed magnitudes are live. FBHAttributeMod_Attribute (0x522E760) reads the backing attribute through a shared reference to the target component’s attribute record (0x5227A00). It is evaluated on application (0x5239540) and again whenever that attribute’s current value changes on the same component (0x5237050 → 0x5238840 → 0x5238A10, §4.2). Time-based re-evaluation (0x522D260) only applies to bScaleByDuration. So the seven sight overrides follow MinZeroingRange and settle on its final value.

8. Open questions

# Question
E-1 Closed (§4.4): the combining function is 0x522E5C0, run by the flush 0x522C4F0 after every base write; stack scaling is linear per operation (§4.2)
E-2 Duration semantics beyond 0 (for example whether −1 means infinite)
E-3 Rollback mechanism and the role of UNetworkPredictionWorldManager
E-4 Closed: every effect’s modifiers, durations, stacks and granted tags are on Gameplay Effect Values
E-5 Closed (§7): 0x6C9F1A0 / 0x6C9E190 apply attachment and sight effects to the weapon item’s own component; the initial sight (S_Aim01) and the mounted-bipod lists are closed in §7.1; attribute-backed magnitudes, including the zeroing overrides, are evaluated live (§4.2, §7.1)
E-6 Vehicle health via effects: GE_Vehicle_Health and vehicle-side callers of 0x52311D0 (0x7665D60, and the Auth_RefillFuel exec thunk 0x7667280; the corpus row 0x766727F is an empty nullsub one byte early) are not traced
E-7 Closed: +0x150 = OngoingRequirements not met (0x52330B0, 0x522CB40), so the effect’s modifiers are excluded; +0x3C = pending predicted stack delta (0x52313E0, 0x5231DA0); +0x100 / +0x12C = Num / NumFreeIndices of the pending predicted-removal key set at +0xF8 (equal = empty)

9. Cross-references

Change log

Date Change
2026-10-16 v1: BH-GAS architecture, 338 GE classes by prefix, attribute map, prediction question.
2026-10-17 Corrected against the decompilation corpus, SDK and data: attributes are double base/current records (the map is only defaults); Modifiers element type and operations documented; stacking is a per-modifier curve; base-value writes and the damage path traced; preset types, catalog descriptions, StanceRecoil count (21), the three preset files and the example rewritten from data; authority language removed; cues are a separate component.
2026-10-17 Effect values exported from the paks and published on Gameplay Effect Values; E-4 closed; the scope example uses the real modifiers.
2026-10-17 Independent verifier pass: closed E-1 with the combining formula (§4.4); stack scaling is linear per operation, not a curve (§4.2); Fixed with a curve row returns Value × Curve(0); the attribute hooks and their three registrants (§4.3); E-7 added.
2026-10-17 Round-4 verifier pass: E-5 closed (§7) with what applies to a weapon (§7.1); E-7 closed; no weapon attribute has a hook; character health’s hook clamps; ApplyEffect stacks are clamped and every call is a new instance (§5); E-6 citation corrected.
2026-10-17 Round-5 verifier pass: StackExpirationPolicy is also read on duration expiry (0x522D260, §5 and §7.1); the initial sight is S_Aim01 and the mounted bipod’s lists are applied by B_Action_MountBipod (§7.1); E-5 updated.
2026-10-18 Round-6 verifier pass: magnitude re-evaluation (§4.2): attribute-backed magnitudes follow their backing attribute live, and the duration pass 0x522D260 re-evaluates only time-dependent modifiers; the zeroing-capture question is closed (§7.1, E-5); Override arrays are swap-removed, so “first” is application order only until a removal (§4.4).