DrawDebugSphere — draw debug sphere in world

SphereTraceSingle — sphere sweep for collision detection

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.

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Collision

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

Physics Body

A SceneComponent with simulate-physics enabled. Driven by forces, gravity, collisions instead of explicit transforms.

SpawnEmitterAtLocation — spawn particle effect at world location

UGameplayStatics::SpawnEmitterAtLocation. For Niagara, use SpawnSystemAtLocation.

Overlap

Two collision shapes occupying the same space without blocking. Use for triggers (volume, pickup).

Hit

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

Static Mesh

A non-deforming 3D model (rocks, walls, props). Cheap to render. For animated meshes use Skeletal Mesh.