VLerp — linearly interpolate between two vectors

Lerp (float) — linear interpolate between two floats by Alpha

Alpha=0 returns A, Alpha=1 returns B. Does NOT clamp Alpha.

Lerp

Linear interpolation — returns A when Alpha=0, B when Alpha=1, and a smooth blend in between. Pair with Timeline for animation.

FInterpTo_Constant — constant-speed interpolation toward target

Moves at constant speed unlike FInterpTo which decelerates.

Interface: implement and call Blueprint interface function

SETUP: Create a Blueprint Interface asset (BPI_Interactable) with a function 'Interact'. IMPLEMENT: In the actor BP, go to Class Settings → Interfaces → Add → BPI_Interactable. Then implement the 'Interact' event that appears in the event graph. CALL: Get actor reference → 'Does Implement Interface(BPI_Interactable)' → Branch → True → 'Interact (Message)' node (the interface call). Key: Interface calls are 'Message' type nodes. Use 'Does Implement Interface' before calling to avoid crashes on actors that don't implement it.

Interactable interface system with line trace from camera

Pattern: BPI_Interactable interface with Interact(APawn* Caller) and GetInteractText(). Player Tick: GetPlayerCameraManager → GetCameraLocation/Rotation → LineTraceSingle(CamLoc, CamLoc + Forward*InteractDistance) → BreakHitResult → HitActor → DoesImplementInterface(BPI_Interactable) → True: show UI prompt, store as FocusedActor. Interact input → call Interact(Self) on FocusedActor.

Lerp float — linearly interpolate between A and B by Alpha

UKismetMathLibrary::Lerp. Alpha 0=A, Alpha 1=B.

Create a Blueprint Actor with a timeline that smoothly interpolates between two locations over 2 seconds

FInterpTo — smooth interpolation toward target value over time

Frame-rate independent smoothing. Higher InterpSpeed = faster approach. Use every tick with DeltaSeconds.

FInterpTo — smoothly interpolate a float toward target each frame

Use with EventTick. DeltaTime from Tick, InterpSpeed controls how fast (e.g. 5.0).