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.

SetCollisionEnabled — enable, disable or set query-only collision

ECollisionEnabled values: NoCollision, QueryOnly, PhysicsOnly, QueryAndPhysics.

SetCollisionEnabled — change collision behavior on component

Enum: NoCollision, QueryOnly, PhysicsOnly, QueryAndPhysics.

OnComponentBeginOverlap

Fires when another actor starts overlapping a Collision component. Use for triggers, pickups, hit detection.

Spawn actor at location with collision handling

Pattern: Trigger → SpawnActorFromClass(Class, MakeTransform(Location, Rotation, Scale), CollisionHandling, Owner) → ReturnValue → IsValid branch → use spawned actor. Always check IsValid on ReturnValue. For many spawns, spread across frames with timer to avoid hitches.

SetCollisionProfileName — set collision profile by name

Common profiles: BlockAll, OverlapAll, BlockAllDynamic, OverlapAllDynamic, Pawn, NoCollision, Custom.

BoxTraceSingle — box sweep for collision detection

CapsuleTraceSingle — capsule sweep for collision detection

SetActorEnableCollision — enable or disable all collision on actor