MultiGate — distribute execution across multiple outputs

Vertical Box

Lays out children top-to-bottom. Children's Size pins control how space is distributed.

Pickup and collectible system with overlap trigger

Pattern: Pickup actor with SphereCollision(overlap), StaticMesh visual. OnComponentBeginOverlap → CastTo PlayerCharacter → Success: call AddScore/AddItem interface on player → PlaySoundAtLocation → SpawnEmitterAtLocation → DestroyActor(self). Set collision to OverlapOnlyPawn for performance.

ApplyRadialDamage — apply damage to all actors within a radius

BreakHitResult — decompose hit result structure into components

UGameplayStatics::BreakHitResult. Most important outputs: bBlockingHit, ImpactPoint, ImpactNormal, HitActor, HitComponent.

Horizontal Box

Lays out children left-to-right. Same Size pin model as Vertical Box.

Create a Blueprint for a spawner that spawns enemies at random locations within a box volume every few seconds

SpawnEmitterAtLocation — spawn a legacy Cascade particle system

Legacy Cascade system. Prefer Niagara (SpawnSystemAtLocation) for new projects.

Health and damage system with ApplyDamage and EventAnyDamage

Dealing damage: Event → ApplyDamage(TargetActor, BaseDamage, InstigatorController, DamageCauser, DamageTypeClass). Receiving: EventAnyDamage → Damage output → Subtract_FloatFloat(CurrentHealth, Damage) → FClamp(Result, 0, MaxHealth) → SET CurrentHealth → Branch(CurrentHealth <= 0) → True: DestroyActor. Initialize CurrentHealth=MaxHealth in BeginPlay.

SpawnSystemAtLocation — spawn a Niagara/Cascade particle system

UNiagaraFunctionLibrary::SpawnSystemAtLocation. bAutoDestroy=true for fire-and-forget. Use SpawnSystemAttached to attach to a component.