Component

A reusable piece of behavior or geometry attached to an Actor. Static Mesh, Collision, Audio, Camera are all components.

Component pattern: create Actor Component BP for reusable logic

CREATE: New Blueprint → parent class UActorComponent (or USceneComponent if needs transform). Add variables (Health, MaxHealth). Add EventBeginPlay (available in component). Add custom events/functions (TakeDamage, Heal, OnDeath). ADD TO ACTOR: In your Actor BP → Add Component → search for your component class. Or: SpawnActorFromClass → GetComponentByClass → CastTo<BP_HealthComponent>. CROSS-COMMUNICATION: In Component's OnDeath → GetOwner → CastTo<BP_Character> → call OnCharacterDied. Or: Component has Event Dispatcher 'OnDied' → owner binds to it. BENEFIT: Reuse HealthComponent on Enemy, Player, Vehicle without code duplication.

SetVisibility on component — show or hide a scene component

SetWorldLocation on component — set component world position

K2_SetWorldLocation. USceneComponent method.

SetWorldRotation on component — set component world rotation

GetComponentByClass — find first component of a specific class on actor

Pure node. Cast result to your component class. Returns null if not found.

OnComponentHit — hit event on specific component

SetComponentTickEnabled — enable or disable tick on a component

OnComponentEndOverlap — end overlap on specific component

SceneComponent

A component with a Transform — can be attached and positioned in 3D. Static Mesh and Camera inherit from it.