Hit

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

Melee attack with sphere trace and damage in front of character

Pattern: Attack input → Branch(bCanAttack) → PlayMontage(AttackMontage) → SET bCanAttack=false. AnimNotify during montage: GetActorLocation + GetActorForwardVector*AttackRange → SphereTraceMulti(Loc, Loc+Forward*Range, AttackRadius) → ForEach hit: Branch(HitActor != Self AND not already hit) → ApplyDamage(HitActor, Damage). OnMontageEnded → SET bCanAttack=true.

Dash or dodge movement with cooldown using timeline

Pattern: Variables bCanDash(bool)=true, DashDistance(float)=1000, DashDuration(float)=0.2. Input → Branch(bCanDash) → SET bCanDash=false → GetActorForwardVector → Multiply(Forward, DashDistance) → Timeline(0→1 over DashDuration) → Update: VLerp(StartLoc, StartLoc+DashOffset, Alpha) → SetActorLocation. Finished → Delay(CooldownTime) → SET bCanDash=true.

Projectile actor that moves forward and deals damage on hit

Pattern: BP_Projectile with SphereCollision(root), StaticMesh, ProjectileMovementComponent(InitialSpeed=3000, MaxSpeed=3000, bRotationFollowsVelocity=true). OnComponentHit → ApplyDamage(OtherActor, Damage, GetInstigatorController, Self) → SpawnEmitterAtLocation(ImpactPoint) → DestroyActor. Spawner: SpawnActorFromClass(BP_Projectile, MuzzleLocation, MuzzleRotation).

LaunchCharacter — apply a velocity impulse to a Character

bXYOverride/bZOverride: if true, replaces current velocity. If false, adds to it.

EventHit — fires when actor is hit by or hits something

Requires Simulation Generates Hit Events on physics body.

AddImpulse — apply instant impulse to physics body

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

Play animation montage on character with callback when finished

Pattern: EventBeginPlay or custom event → GetMesh → PlayMontage(MontageToPlay=AM_Attack, Rate=1.0) → Bind to OnMontageEnded delegate on AnimInstance for completion callback. Simpler approach: use Delay(Duration=MontageLength) after PlayMontage as rough callback. Key: PlayMontage is called on SkeletalMeshComponent (GetMesh()). Inputs: 'InSkeletalMeshComponent' and 'MontageToPlay'. Returns montage length as ReturnValue.

Camera shake on damage feedback for player

Pattern: On EventAnyDamage → GetPlayerController(0) → GetPlayerCameraManager → StartCameraShake(DamageShakeClass, MapRangeClamped(Damage, 0, 100, 0.3, 1.0)). Create CameraShakeClass as BP extending UCameraShakeBase with RotOscillation and LocOscillation settings.

StopMontage — stop a currently playing AnimMontage