Open76

About

Interstate '76 is Activision's 1997 vehicular combat game for Windows, set in an alternate 1976 where the 1973 oil crisis never ended. Open76 is an engine reimplementation of Interstate '76 in Unity. It parses and renders nearly everything in a level, including cars, and can run the mission stack machines, but many mission actions are unimplemented and the car simulation (engine, gearbox) still needs a lot of work, though driving and camera modes work.

Getting started

Open the level scene in Unity, then set the Game object's "Game path" property to your Interstate '76 install directory. Both the original uncompressed and later compressed ZFS data files are supported, but the Nitro pack's mission format is not yet handled.

History

The author had tinkered with Interstate '76 for years without much progress until early 2017, when the blogger "That Tony" had reverse-engineered most of the game's file formats.

Known issues & limitations

• gameplay: The car simulation does not work yet; driving and camera modes work but extensive vehicle physics implementation is needed.
• compatibility: Nitro pack appears to have a different mission file format which needs investigation.

Media

Licensing & legal

• Licensed under GPL version 3 and not affiliated with or endorsed by Activision.

Additional notes

Goal

A stated long-term goal is extending the engine with modern features such as HMD and VR support.