AI patrol between waypoints using NavMesh

Variables: WaypointLocations (Array<Vector>), CurrentWaypointIndex (int). Pattern: EventBeginPlay → set up WaypointLocations array → MoveToNextWaypoint (custom event). MoveToNextWaypoint: GetController → CastTo<AIController> → MoveToLocation(Dest=WaypointLocations[CurrentWaypointIndex], AcceptanceRadius=100) → Bind OnMoveCompleted delegate → In callback: Increment CurrentWaypointIndex (modulo array length) → call MoveToNextWaypoint again. Alternative: Use SimpleMoveToLocation for simpler cases. Requires NavMeshBoundsVolume in scene. GetRandomReachablePointInRadius for random wander.

Simple AI patrol between waypoints using spline or array of points

Pattern: Variables PatrolPoints(Array<Vector>), CurrentIndex(int)=0. BeginPlay: SimpleMoveToLocation(PatrolPoints[0]). OnMoveCompleted (or Tick+distance check): SET CurrentIndex = (CurrentIndex+1) % Array_Length → SimpleMoveToLocation(PatrolPoints[CurrentIndex]). Add Delay between moves for wait time. Use AIMoveTo for more control.

GetPlayerViewPoint — get camera world location and rotation

Outputs are 'Location' and 'Rotation' — NOT ReturnValue. Used for line traces from camera.

ProjectPointToNavigation — snap a point to the nearest nav mesh

GetRandomReachablePointInRadius — get random nav point near origin

Pure node. Returns false if no valid nav point found. Good for patrol/wander AI behaviors.

PlaySoundAtLocation — play sound at world location

UGameplayStatics::PlaySoundAtLocation.

ProjectWorldLocationToScreen — project 3D location to 2D screen coordinates

APlayerController method.

LineTraceByChannel — raycast along a line and return first hit

TraceChannel: ETraceTypeQuery::TraceTypeQuery1=Visibility, TraceTypeQuery2=Camera. DrawDebugType: None/ForOneFrame/ForDuration/Persistent.

SpawnEmitterAtLocation — spawn particle effect at world location

UGameplayStatics::SpawnEmitterAtLocation. For Niagara, use SpawnSystemAtLocation.

SetActorLocation — teleport actor to world position