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).

Spawn projectile from socket location facing forward

Pattern: InputAction Fire → GetMesh → GetSocketTransform(InSocketName='MuzzleSocket') → BreakTransform(outputs Location, Rotation) → MakeTransform(Location=SocketLocation, Rotation=SocketRotation) → SpawnActorFromClass(Class=BP_Projectile, SpawnTransform=Transform). Key: GetSocketTransform must be called on the SkeletalMeshComponent (GetMesh()), not the actor. Use 'World' TransformSpace. SpawnActorFromClass takes a full Transform, not separate Location/Rotation.

Create a Blueprint for a projectile that moves forward, bounces off walls, and explodes after 3 seconds

Object pooling pattern for frequently spawned actors like projectiles

Pattern: PoolManager with Array<AActor*> AvailablePool. Init: loop SpawnActor N times → SetActorHiddenInGame(true) → SetActorEnableCollision(false) → Array_Add to pool. GetFromPool: Array_Length > 0 → remove last → SetHidden(false) → SetCollision(true) → SetActorLocation → return. ReturnToPool: SetHidden(true) → SetCollision(false) → Array_Add back.

Hit

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

LaunchCharacter — launch character with velocity

ACharacter::LaunchCharacter. Good for knockback, bouncing, jumppads.

string

string

LaunchCharacter — apply a velocity impulse to a Character

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

OnHit

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

Collision

Geometry used for hit-tests and physics. Often simpler than the visual mesh for performance.