thatii/ue5-rewind

Rewind

This repository contains a C++ prototype project implementing time rewinding mechanics in Unreal Engine 5. Check out this video for an overview of the project.

Running the project

To load this project in your local editor, you first need to build the project from source. Check out my video on setting up Visual Studio with UE5 for a tutorial.

Alternatively, if you just want to play with the project, you can download a built version of the game client from the Releases section of this repository.

Demos

Demos from the videos are stored as World Partition Data Layers on the map. You can activate them manually from the Data Layers outliner (Window -> World Partition -> Data Layers Outliner) or at runtime using the hotkeys specified below.

Hotkeys

• Left Mouse Button: Player character shoots a sphere
• T: Toggles player character participation in time manipulation operations
• R: Hold to rewind time; release to stop rewinding
• Left Control: Toggle time scrubbing (freezes time)
• F: Hold to fastforwaard time; only available while time scrubbing
• G: Toggles visualization of snapshots (note this debug feature is currently quite slow with a large number of snapshots and will degrade performance)
• 1: Sets rewind and fastforward speed to quarter real time
• 2: Sets rewind and fastforward speed to half real time
• 3: Sets rewind and fastforward speed to real time
• 4: Sets rewind and fastforward speed to double real time
• 5: Sets rewind and fastforward speed to quadruple real time
• Numpad 1: Toggles data layer for falling bridge
• Numpad 2: Toggles data layer for falling bridge that starts higher up
• Numpad 3: Toggles data layer for moving platforms
• Numpad 4: Toggles data layer for three stacks of barrels
• Numpad 5: Toggles data layer for giant cube falling onto a barrel stack

Diagrams

Here are the diagrams that were discussed in more detail in the video.

Rewind Classes

TRingBuffer Overview

Special Thanks

Many of the static meshes used in this prototype are from the KayKit: Prototype Bits asset pack by Kay Lousberg. You can find the asset pack at https://kaylousberg.itch.io/prototype-bits and see all of Kay's fantastic work at https://www.kaylousberg.com!