Authority

The machine that's authoritative for an actor — usually the server. Check HasAuthority before mutating replicated state.

HasAuthority — server-side authority check for multiplayer

Switch On HasAuthority: 'Authority' exec fires on server, 'Remote' fires on clients. Use to gate server-only logic like damage calculation, score updates, spawning.

HasAuthority — true if running on the server (authoritative side)

Pure node. Use to gate server-only logic. On Listen server: true for host, varies for clients.

Power — raise base to exponent power

Internal function name is MultiplyMultiply_FloatFloat (operator **).

Possess — make a Controller possess a Pawn

Pawn

An Actor that can be possessed by a Controller. Use for the player's avatar and AI agents.

Controller

Non-physical actor that possesses a Pawn and drives its input. PlayerController = human input; AIController = AI logic.

Health system: take damage, clamp health, check death

Pattern: EventAnyDamage → Subtract_FloatFloat(A=CurrentHealth, B=Damage) → Clamp(Value=Result, Min=0, Max=MaxHealth) → SetVariable(Health=ClampResult) → Branch(Condition=(Health <= 0)) → True: call OnDeath custom event. Variables needed: Health (float), MaxHealth (float). EventAnyDamage output pin is 'Damage' (float). Clamp inputs: 'Value', 'Min', 'Max'. All floats.

Atan2 — two-argument arctangent for angle calculation

Returns radians. Use RadiansToDegrees to convert.

string

string