Timeline-driven door opening animation

Variables: StartRotation (Rotator), EndRotation (Rotator), bIsOpen (bool). Add Timeline node with a float track 'Alpha' (curve from 0.0 to 1.0, duration 1.0s). Overlap trigger → Branch(bIsOpen) → False: Timeline.Play → Update: RLerp(A=StartRotation,B=EndRotation,Alpha=Alpha) → SetActorRotation → Finished: SetVariable(bIsOpen=true). True: Timeline.Reverse → Update: same RLerp → Finished: SetVariable(bIsOpen=false). Key Timeline pins: Play exec input opens forward. Reverse plays backward. Update fires every frame. Finished fires when complete. Alpha track outputs 'Alpha' float.

Level

A scene containing actors, lighting, geometry. Open a level via Open Level. Sublevels stream in/out.

Gate — open/close/toggle flow gate

Macro. Enter only passes through when gate is open.

Door open and close with timeline and trigger volume

Pattern: Door actor with BoxTrigger, DoorMesh, Timeline(Alpha 0→1 over 1s). BeginOverlap → PlayFromStart(Timeline). EndOverlap → Reverse(Timeline). Timeline Update: Lerp(ClosedRotation, OpenRotation, Alpha) → SetRelativeRotation(DoorMesh). For sliding: Lerp locations instead of rotations.

Level transition: save data then open new level

Pattern: custom trigger or UI button → [save player data to SaveSlot] → OpenLevel(LevelName='Level_02', bAbsolute=true, Options=''). For loading screen: SetGlobalTimeDilation(0.001) briefly while level loads (freeze world), or use AsyncLoadLevel with progress callback. Key: OpenLevel is in GameplayStatics. 'LevelName' is the map asset name (not full path). bAbsolute=true discards current level completely. Options string can pass params like '?GameMode=BP_GM'.

Create a Blueprint for a door that opens when the player overlaps a trigger and closes when they leave

string

string

OpenLevel — load a new level by name

bAbsolute=true reloads from scratch. LevelName is the map asset name without path.

Gate — pass or block execution based on open/closed state

OpenLevel — load a level by name

UGameplayStatics::OpenLevel. Use OpenLevelBySoftObjectPtr for asset references.