Overview

WCGASAttributeModData is a Data Asset that defines how a target attribute is dynamically modified by source attributes. It allows designers to create complex attribute relationships without writing any C++ code, making derived attribute configuration a fully designer-driven workflow. These modifications are applied as infinite-duration Gameplay Effects and automatically recalculate when source attributes change.

Creating an Attribute Mod Data

Using the Wonderscape GAS Ally Menu

1. Open the Content Browser
2. Right-click in any folder where you want to create the asset
3. Navigate to: Wonderscape GAS Ally → Attributes → Attribute Mod
4. Give your new asset a descriptive name (e.g., DA_MaxHealthMod, DA_SpellDamageMod)
5. Double-click the asset to open it and configure its properties

How Attribute Mod Data Works

Integration Flow

1. Attribute Definition Configuration
   • Create a target Attribute Definition (e.g., DA_MaxHealth)
   • Assign the Attribute Mod Data to its AttributeModData property
   • Register the Attribute Definition in Project Settings
2. Automatic Application at Runtime
   • When an ASC initializes attributes, the WCGASAttributeRegistry detects attributes with AttributeModData set
   • Creates an infinite-duration Gameplay Effect for each source attribute
   • Uses custom MMC (Mod Magnitude Calculation) classes to evaluate formulas
   • Applies effects to the ASC automatically
3. Dynamic Recalculation
   • When a source attribute changes (e.g., Constitution increases from 10 to 11)
   • GAS automatically recalculates all Gameplay Effects that depend on it
   • Target attributes update immediately (MaxHealth increases by 10)
   • No manual refresh or update calls required
4. Formula Evaluation
   • Piecewise Cumulative (Linear, SoftCap, Threshold, ClampedLinear):
     • Each tier calculates only the portion within its range
     • All contributions are summed together
   • Evaluate at Boundaries (Exponential, Curve, Logarithmic, etc.):
     • Evaluates formula at range boundaries
     • Subtracts to get tier contribution

Configuration Properties

Source Attributes Array