# ProjectBorealis/PBCharacterMovement

HL2-style, classic FPS movement for Unreal Engine implemented in C++

Repository: https://github.com/ProjectBorealis/PBCharacterMovement
Canonical: https://ross.abutalabs.com/products/pbcharactermovement
Homepage: https://www.projectborealis.com/movement
Language: C++
License: MIT
License Family: permissive
Topics: unreal, unreal-engine, unreal-engine-4, unreal-engine-plugin, ue4, ue4-plugin, ue4-plugins, half-life-2, half-life, source-engine, quake
Last push: 2025-06-08T10:55:00+00:00

## Health v2 (maintenance only)
Score: 45/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 25, release rhythm 40, longevity 100
- inputs: {"age_days": 2658, "days_push": 451, "days_rel": 541, "gap_med": 5.5, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1492, forks 176 (observed 2026-08-28T04:04:52.703647+00:00)

## What it is
An Unreal Engine C++ plugin implementing Half-Life 2 / Source Engine style classic FPS character movement, including bunnyhopping, strafe boosting, surfing, and ramp sliding. It is developed by the Project Borealis team as part of their fan-made Half-Life 2: Episode 3 game.

## Use cases
- add HL2-style bunnyhopping and air strafing to an Unreal Engine game
- implement Source engine movement mechanics like surfing and ramp sliding in UE4/UE5
- recreate classic FPS movement feel in Unreal Engine
- add smooth crouching and crouch jumping to a character movement component
- build a retro arena shooter with quake-style movement physics

## When to choose
- you want authentic Half-Life 2 or Source engine movement quirks in Unreal Engine
- your project is C++-based on Unreal Engine 5.5 or willing to recompile the plugin
- you need proven classic FPS mechanics like strafe boosting and trimping out of the box

## When to avoid
- your project is Blueprint-only, since packaging fails without a C++ project
- you use an older Unreal Engine version that may require code changes
- you need ladder movement or sprint logic fully implemented, as those are stubs

## Facets
- artifact type: plugin
- maturity: active
- function: game-engine, simulation
- domain: gaming-tools
- platform: cpp, cross-platform, game-engine
- tags: unreal-engine, unreal-engine-plugin, character-movement, source-engine, half-life-2, fps-movement, bunnyhopping, quake, game-development

## Member repositories
- ProjectBorealis/PBCharacterMovement (main) score 45

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:52.703647+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:33:28.541037+00:00, confidence not recorded.
  - readme: https://github.com/ProjectBorealis/PBCharacterMovement (fetched 2026-08-28T04:04:52.703647+00:00, sha 56dd82f3141f)
  - homepage: https://www.projectborealis.com/movement (fetched 2026-08-29T11:39:06.548035+00:00, sha 8e8162f1edae)
  - site_page: https://projectborealis.com/ (fetched 2026-08-29T11:39:06.557151+00:00, sha 6e1197855c49)
  - site_page: https://projectborealis.com/faq (fetched 2026-08-29T11:39:06.558850+00:00, sha bb50d72febb5)
- Data as of 2026-08-30T08:39:29.467469+00:00.