Hit

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

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

EventHit — fires when actor is hit by or hits something

Requires Simulation Generates Hit Events on physics body.

OnHit

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

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).

Collision

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

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

LaunchCharacter — launch character with velocity

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

LaunchCharacter — apply a velocity impulse to a Character

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