Create a Blueprint for a simple FPS weapon that shoots raycasts and deals damage

string

string

Hit

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

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).

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

Possess — make a Controller possess a Pawn

Pawn

An Actor that can be possessed by a Controller. Use for the player's avatar and AI agents.

GetTargetArmLength — get spring arm distance

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.

Spring Arm

A boom that holds a child component (usually a Camera) at a fixed offset, with collision-aware retraction. Standard for third-person cameras.