Niagara particle effect at impact point from line trace

Pattern: LineTraceByChannel → Branch(hit=true) → BreakHitResult → SpawnSystemAtLocation(SystemTemplate=NS_Impact, Location=ImpactPoint, Rotation=MakeRotFromX(ImpactNormal), Scale=(1,1,1), bAutoDestroy=true). Use MakeRotFromX with ImpactNormal to orient effect to surface normal. NS_ prefix is convention for Niagara Systems. SpawnSystemAtLocation is in UNiagaraFunctionLibrary. bAutoDestroy=true means the component cleans itself up after the effect completes.

Hit

A blocking collision between two shapes. Fires OnHit on both actors. Use for solid impacts.

OnHit

Fires when a physics collision happens. Use for impact effects, damage on contact.

ApplyDamage — deal damage to a target actor

UGameplayStatics::ApplyDamage. Triggers EventAnyDamage on target.

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.

ApplyDamage — apply damage to an actor

Triggers EventAnyDamage and EventPointDamage on the target actor.

ApplyPointDamage — deal point damage with hit info

EventAnyDamage — receive any type of damage

ApplyRadialDamage — apply damage to all actors within a radius

EventPointDamage — receive point damage with hit info