Nightdive's Thief Remaster Team Finds 'E3 Hack' Code Comments From 1997 Still Alive In The Dark Engine

Nightdive Studios engineers working on Thief: The Dark Project Remastered have described the moment they opened Looking Glass Studios' original version control repository for the Dark Engine as unearthing an archaeological dig rather than a clean source drop. In a near two-hour episode of Digital Foundry's DF Retro Super Show that has just been picked up by outlets over the weekend, software engineer Josh Dowell walked through what the studio found when it finally got its hands on the full codebase for the 1998 stealth classic.

Dowell told the DF Retro Super Show that the repository Nightdive received was, in his words, 'a very very out of date version control repository for the code,' and that this snapshot makes the origins of the Dark Engine's more notorious quirks much easier to read. The history baked into that repository, he explained, suggests that 'most of the team that started working on it ended up moving to different projects and then a whole new team took over for the second half of its development,' which helps explain why some of the code reads as if more than one studio had a hand in it. The original Thief, then still called The Dark Project, was first shown at E3 in 1997 with a release planned for later that year before being pushed into 1998, and the comments still attached to that 1997-era code make that rushed final stretch of development feel very immediate.

'My favorite part of looking through the Dark Engine codebase has been seeing all of the evil comments left by the Looking Glass programmers, all the Irrational Games programmers,' Dowell said. 'They have the wildest things to say about the code. They say, "Giant hack! Never replicate this! We must fix this before '98!" "E3 hack! We must delete this after E3!" and it's still there in Thief 2.' The implication is that code paths tagged for the 1997 E3 demo and for pre-release cleanup somehow survived a full release and a sequel, which is exactly the kind of archaeology a faithful remaster has to deal with.

The interview also confirms the technical backbone of the remaster. Thief: The Dark Project Remastered is being rebuilt on Nightdive's in-house KEX Engine, the same toolchain that already powers the studio's Quake and Quake II remasters. Dowell noted that Thief's renderer is, in his words, 'shockingly, just a clone of Quake,' with lighting and light-state handling that 'is exactly the same as Quake.' Where the two engines really diverge is in visibility: where Quake precomputes what the player can see from each spot in a level, the Dark Engine does the same kind of calculation in real time, treating every doorway as a portal and chaining visibility through it. 'It's super complicated and I can't believe they got away with it in '98,' Dowell said of the realtime portal system.

Thief: The Dark Project Remastered was originally announced during Summer Game Fest in Los Angeles in June, when Nightdive, Eidos-Montréal and Atari confirmed that the project would target PlayStation 5, Xbox Series X|S, Nintendo Switch 2, Steam, the Epic Games Store, GOG, and last-generation PlayStation 4 and Switch hardware, with all of the missions from Thief Gold included alongside new quality-of-life features like a weapon and item wheel and full support for custom fan campaigns. The CEO of Nightdive, Stephen Kick, has framed the project as a restoration rather than a reinvention, writing in the official announcement that 'Thief didn't just introduce stealth mechanics, it defined them' and that the studio wants to preserve the tension and intelligence of the original while enhancing it for modern players. The current launch window is winter 2026, with no firm day yet. The full DF Retro Super Show 021 episode is available on Digital Foundry's YouTube channel.