Pat Kerr's 30-Year-Old Physics Prototype Revived for GTA

Pat Kerr, a veteran programmer, has released a playable demo of his 30-year-old physics prototype. This was the basis of the vehicle system in the original Grand Theft Auto game. The demo, recreated in JavaScript, shows a "slightly prettier, 'remastered' form" of the pioneering vehicle tech that Kerr developed in the late 1990s.

"In the early days of GTA1 development, the driving just wasn’t fun," recalls Obbe Vermeij, Rockstar veteran and Kerr's collaborator. "Then Pat Kerr, who is handy with physics but wasn’t even on the team, dropped in some driving code that fixed it."

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Contextual Subheading: The Origins of GTA's Vehicle System

John Kerr's pioneering 2D physics simulation, first developed in 1996, laid the groundwork for a fundamental classical 2D rigid body dynamics system that would later become a cornerstone of game development. Characterized by its straightforward approach, the simulation predates the widespread adoption of similar techniques in the gaming industry at the time.

As part of his core update, Kerr introduced a novel vehicle simulation layer, drawing on a rudimentary, inexact model of tyre behavior. This approach, while not grounded in physical accuracy, yielded satisfactory results for his purposes at the time, reflecting a pragmatic approach to problem-solving.

noting that the original driving system in Grand Theft Auto was led by veteran programmer Pat Kerr. Who's credited as saving the game's cars by Rockstar veteran Obbe Vermeij notes Vermeij. "Some 30 years later, Kerr's revisited that pioneering vehicle tech in a new demo you can play for yourself."

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