Ghost – Lightweight Transform Recorder & Replayer for Unreal Engine 5

Ghost is a tiny Unreal Engine plugin (≈ 250 lines of code) that lets you
record an Actor’s transform at runtime or PIE and instantly replay it as a “ghost” path.
It’s perfect for quick AI path visualization, instant‑replay kill‑cams, racing lap ghosts, cinematic pre‑vis, physics determinism checks, and rapid time‑rewind prototypes.

1. Clone / copy this repo into your UE project’s Plugins/ folder
   (or fork & add as a sub‑module).

   MyProject/ └─ Plugins/ └─ Ghost/ ← this repo

2. Regenerate Visual Studio/Xcode files (right‑click .uproject → Generate project files).

3. Build the project (Development Editor).

4. In the Unreal Editor open Edit → Plugins, enable Ghost, and restart.

Engine versions
Tested on UE 5.0 → 5.4. Should work on UE 4.27 if you rename the module’s Default loading phase to PostEngineInit.

1. Add Component → Transform History to any Actor you want to track.

2. In Blueprint:

   Event BeginPlay
       → StartRecording (target: TransformHistoryComponent)
   
   Custom Event <StopAndReplay>
       → StopRecording
       → PlayBack   (Loop = false, OverrideDuration = 0)
   
   

3. Press Play‑in‑Editor → run around → trigger ShowReplay. The Actor rewinds along its exact path.

Blueprint nodes: StartRecording: Begin capturing keyframes. StopRecording: Stop and seal the buffer (adds a final key). PlayBack(loop, overrideDuration): Re‑animate the track. ClearHistory: Wipe all samples. GetRecordedLength: Total seconds captured. AddTransformHistoryComponent(Target): Runtime helper (library node).