Purpose:

This is the calculation engine that automatically determines how source attributes (like Constitution, Strength, Agility) modify target attributes (like MaxHealth, AttackPower, MovementSpeed). It handles all the math behind attribute dependencies in your game.

What It Does:

When you set up an attribute to be modified by other attributes (for example, MaxHealth being influenced by Constitution and Strength), this calculator:

1. Reads the configuration you've defined in your AttributeDefinition's ModData
2. Captures the current values of all the source attributes affecting the target
3. Applies your formulas (linear, exponential, curves, soft caps, etc.) to calculate each source's contribution
4. Handles multi-tier scaling automatically - for example, Constitution might give +10 per point from 0-50, then +5 per point from 50-100, then +2 per point beyond 100
5. Returns the total modification that gets added to the target attribute's base value

How It's Used:

You never interact with this class directly as a designer. The WCGASAttributeModSubsystem automatically uses this calculator when you configure attribute modifications in your AttributeDefinition assets. The Gameplay Ability System calls it automatically whenever:

• An effect is first applied
• Any source attribute changes value
• The system needs to recalculate

Designer-Friendly Example:

If you set up MaxHealth to be modified by Constitution (×10) and Strength (×5), and a character has Constitution=75 and Strength=50, this calculator automatically computes: (75×10) + (50×5) = 1000, and adds that to the base MaxHealth value. If Constitution changes to 80, it instantly recalculates to 1050.