Skip to main content
This page dives into systems only advanced users or plugin developers typically use.

​
1. Regeneration System

Each attribute can have:
  • Regen rate
  • Regen delay
  • Regen “tick” period
UMAS handles:
  • Pausing regen during effects
  • Modifying regen via link definitions
  • Regeneration clamping
  • Triggering attribute change events on tick

​
2. Dynamic Modifiers

Modifiers can be applied:
  • Temporarily (effects)
  • Permanently (equipment)
  • Conditionally (if Stamina < 20)
  • Over time (weight system, hunger system)
UMAS stores modifiers separately, evaluating them in order:
  1. Additive
  2. Multiplicative
  3. Override
  4. Clamps

​
3. Runtime Attribute Registration

You can add attributes dynamically in C++: 
Attr->RegisterAttributeRuntime("HeatResistance", DefinitionStruct);
Useful for:
  • Modding
  • Equipment adding stats on the fly
  • Boss-specific attributes created at runtime

​
4. Advanced Effect Authoring

Custom effects can:
  • Query other attributes
  • Scale with source instigator stats
  • Execute custom C++ calculations
  • Stack or refresh
  • Expire based on conditions

​
5. Performance Notes

UMAS is optimized for:
  • High attribute counts (100+)
  • Large NPC populations
  • MMO-style replication volumes
It uses:
  • Packed structures
  • Attribute batching
  • Dirty-value replication

​
6. Debug Tools

UMAS includes:
  • Console commands to inspect attribute states
  • Debug printing for effects
  • PIE-only warnings for invalid handles
  • Optional verbose logs for progression/link debugging