# Open Horizon: rebuilding Ace Combat: Assault Horizon rendering and physics

> Open Horizon reimplements the rendering and physics of Ace Combat: Assault Horizon in C++ using resource files from the original game. Its source includes game, renderer, physics and container modules. Its contribution guide suggests clean-room design or documenting findings when direct disassembly is unavoidable.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/undefined-darkness/open-horizon>
- Primary source: <https://github.com/undefined-darkness/open-horizon/blob/c9701767674c6361925e0aed434553c0ee837771/README.md>
- Catalog page: <https://awesomerea.org/resources/open-horizon-ace-combat-case/>
- Record JSON: <https://awesomerea.org/resources/open-horizon-ace-combat-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/open-horizon-ace-combat-case/index.md)

## Requirements & limits

- **Prerequisites:** Requires resource files from the original Ace Combat: Assault Horizon game.
- **Prerequisites:** Build configuration uses CMake and OpenGL.
- **License:** Licensed under MIT.

## Primary sources

1. <https://github.com/undefined-darkness/open-horizon/blob/c9701767674c6361925e0aed434553c0ee837771/README.md>
2. <https://github.com/undefined-darkness/open-horizon/blob/c9701767674c6361925e0aed434553c0ee837771/CONTRIBUTING.md>

## More in Games

- [Open KF: a Killing Floor reimplementation in Rust and Bevy](https://awesomerea.org/resources/open-kf-killing-floor-case/index.md) · Case study
- [Open Northland: reimplementing Cultures - 8th Wonder of the World](https://awesomerea.org/resources/open-northland-case/index.md) · Case study
- [Open RCT3: an early RollerCoaster Tycoon 3 reimplementation](https://awesomerea.org/resources/open-rct3-case/index.md) · Case study
- [Open SoM Runtime: rebuilding the Sword of Moonlight runtime](https://awesomerea.org/resources/open-som-runtime-case/index.md) · Case study
- [Open Sosaria: reconstructing the 1981 Apple II Ultima engine](https://awesomerea.org/resources/open-sosaria-ultima-case/index.md) · Case study
- [Open Van Buren: reconstructing the Fallout 3 tech demo engine](https://awesomerea.org/resources/open-vanburen-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.