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Accessing the Attribute Manager

Every Actor with UMAS has the AttributeManagerComponent. In Blueprint: Get Component → Attribute Manager Component From here you can:
  • Get Attribute
  • Modify Attribute
  • Add XP
  • Apply Effect
  • Query current levels
  • Receive events

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Getting Attribute Values

UMAS provides Blueprint nodes:
  • Get Attribute Value (Handle)
  • Get Base Attribute Value
  • Get Max Attribute Value
  • Get Min Attribute Value
  • Get Attribute Info Struct
Example usage: 
Get Attribute Value → Health
Use in UI, combat, stamina checks, etc.

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Modifying Attributes

Common Blueprint nodes:
  • Add Attribute Value
  • Subtract Attribute Value
  • Multiply Attribute Value
  • Set Attribute Value
  • Clamp Attribute Value
Examples:
  • Reduce Stamina on sprint
  • Add Health on potion use
  • Increase Hunger every hour
UMAS applies all changes through its internal engines, ensuring replication + link definitions update correctly.

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Applying Effects

Blueprint node: Apply Attribute Effect Parameters typically include:
  • Effect Data Asset
  • Instigator
  • Magnitude override (optional)
  • Duration override (optional)
Effects support:
  • Timed buffs
  • Damage over time
  • Regen over time
  • Temporary stat changes

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Adding XP / Levels

If the attribute supports progression:
  • Add XP to Attribute
  • Set Level
  • Get Attribute Level
  • Get Current XP / XP Required
Used for:
  • Skill systems
  • Passive survival XP
  • RPG attributes leveling up

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Listening for Events

Inside Blueprint, most common are:
  • On Attribute Changed
  • On Attribute Increased / Decreased
  • On Attribute Zero
  • On Effect Applied / Removed
  • On Level Up
  • On XP Changed
These events fire automatically.

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Designer Notes

  • Blueprints can do everything needed for most projects.
  • You rarely need C++ unless you want custom calculations or overrides.
  • For survival games, handle most logic in tick or timers using the AMC.
  • UI should poll or bind to Attribute Changed events for performance.

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Developer Notes

  • Blueprint nodes are wrappers around fast C++ calls.
  • Attribute handles can be exposed via BP-friendly enums if desired.
  • Full editor-time validation is performed to prevent invalid modifications.