FindLookAtRotation — rotation from Start point looking at Target point

Returns the Rotator needed to look from Start toward Target. Common for aiming and facing.

SpawnEmitterAtLocation — spawn particle effect at world location

UGameplayStatics::SpawnEmitterAtLocation. For Niagara, use SpawnSystemAtLocation.

Smooth rotation toward a target location using RInterpTo on Tick

Pattern: EventTick → FindLookAtRotation(Start=GetActorLocation, Target=TargetLocation) → RInterpTo(Current=GetActorRotation, Target=LookAt, DeltaTime=DeltaSeconds, InterpSpeed=5.0) → SetActorRotation(NewRotation=InterpResult). Key pins: FindLookAtRotation inputs are 'Start' and 'Target' (both Vectors). RInterpTo inputs: 'Current' (Rotator), 'Target' (Rotator), 'DeltaTime' (float), 'InterpSpeed' (float). SetActorRotation input: 'NewRotation' (Rotator).

FindLookAtRotation — get rotation to look from Start toward Target

Pickup and collectible system with overlap trigger

Pattern: Pickup actor with SphereCollision(overlap), StaticMesh visual. OnComponentBeginOverlap → CastTo PlayerCharacter → Success: call AddScore/AddItem interface on player → PlaySoundAtLocation → SpawnEmitterAtLocation → DestroyActor(self). Set collision to OverlapOnlyPawn for performance.

BoxTraceSingle — box sweep for collision detection

Line trace from camera to detect what player is looking at

Pattern: GetPlayerController → GetPlayerViewPoint(outputs Location,Rotation) → GetForwardVector(Rotation) → Multiply_VectorFloat(A=Forward, B=TraceDistance) → Add_VectorVector(A=CameraLocation, B=Offset) → LineTraceByChannel(Start=CameraLocation, End=TraceEnd). GetPlayerViewPoint exec in='execute', exec out='then', outputs: 'Location' (Vector) and 'Rotation' (Rotator).

SpawnEmitterAtLocation — spawn a legacy Cascade particle system

Legacy Cascade system. Prefer Niagara (SpawnSystemAtLocation) for new projects.

LineTraceSingle — raycast single hit by channel

UKismetSystemLibrary::LineTraceSingle. WorldContextObject is hidden. End pin is world position, not direction.

Elevator or moving platform with timeline and trigger

Pattern: Variables StartLocation(Vector), EndLocation(Vector). BeginPlay: SET StartLocation=GetActorLocation. Timeline MoveTimeline(Alpha 0→1 over Duration). Trigger overlap/button press → Play Timeline. Timeline Update: VLerp(StartLocation, EndLocation, Alpha) → SetActorLocation(Self, Result, bSweep=true). Finished: Delay → Reverse Timeline.