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.

SpawnEmitterAtLocation — spawn particle effect at world location

UGameplayStatics::SpawnEmitterAtLocation. For Niagara, use SpawnSystemAtLocation.

OnHit

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

Create a Blueprint Actor that plays a sound and spawns a particle effect at its location when destroyed

Slow motion effect using SetGlobalTimeDilation

Activate: SetGlobalTimeDilation(0.2) → SetTimerByFunctionName(FunctionName='EndSlowMo', Time=2.0 (real time), bLooping=false). IMPORTANT: Timer Duration uses GAME time, so compensate: actual timer Time = desired_real_seconds * TimeDilation (e.g. 2.0 real sec at 0.2 dilation = 0.4 game sec). End: SetGlobalTimeDilation(1.0). For player-only slow motion: use CustomTimeDilation on the pawn (set to 5.0 when world is 0.2).

ApplyDamage — deal damage to a target actor

UGameplayStatics::ApplyDamage. Triggers EventAnyDamage on target.

ApplyDamage — apply damage to an actor

Triggers EventAnyDamage and EventPointDamage on the target actor.

ApplyPointDamage — deal point damage with hit info

AddImpulse — apply an instant velocity change to a physics body

bVelChange=true treats Impulse as direct velocity change (ignores mass). bVelChange=false treats it as a force impulse (mass-dependent).

AddImpulse — apply instant impulse to physics body

One-shot force. bVelChange=true treats Impulse as velocity change.