# Thirdeye: reimplementing the AESOP engine for Eye of the Beholder 3 and Dungeon Hack

> Thirdeye reimplements the AESOP/16 and AESOP/32 engine in C++ to run Eye of the Beholder 3 and Dungeon Hack from their original RES files and unchanged bytecode. It includes a SOP virtual machine, resource readers and a RES disassembler, alongside a modern runtime with SDL3 audio, input and display support.

- 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/psi29a/thirdeye>
- Primary source: <https://github.com/psi29a/thirdeye/blob/4ec4e6a69bcca459bf73b35fcbe2d47fcee88617/README.md>
- Catalog page: <https://awesomerea.org/resources/thirdeye-aesop-engine-case/>
- Record JSON: <https://awesomerea.org/resources/thirdeye-aesop-engine-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/thirdeye-aesop-engine-case/index.md)

## Requirements & limits

- **Prerequisites:** Original copies of the games and their data are required.
- **Prerequisites:** Building requires CMake 3.15 or newer, a C++20 compiler, SDL3, OpenAL and WildMIDI.
- **Limits:** Version 0.90.0 is marked unreleased; some described Dungeon Hack features are in that unreleased version.
- **License:** GPL-3.0.

## Primary sources

1. <https://github.com/psi29a/thirdeye/blob/4ec4e6a69bcca459bf73b35fcbe2d47fcee88617/README.md>
2. <https://github.com/psi29a/thirdeye/blob/4ec4e6a69bcca459bf73b35fcbe2d47fcee88617/docs/architecture.md>

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## 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.