Rivian pays for 400,000 daily clips to build digital test tracks

Rivian receives over 400,000 driving sequences from its vehicle fleet every single day. The majority of this footage captures routine travel, but the rare, chaotic moments that challenge self-driving software are what the company needs most. To isolate those specific scenarios, Rivian has acquired Third Dimension, a 15-person startup based in the United Kingdom.

The acquisition, first reported by TechCrunch, allows Rivian to rebuild real-world streets as three-dimensional test environments. The company did not disclose the purchase price. Third Dimension was founded in 2024 by Tolga Kart and Piotr Sokólski. Kart spent more than two years working on Autopilot simulation at Tesla and previously led engineering at Parallel Domain. Sokólski spent four years at Wayve developing photorealistic neural simulators.

Before joining Rivian, Third Dimension raised a $7 million seed round led by Felicis in October 2024. The firm described itself as a generative AI tool designed to build 3D environments for game engines. It listed game studios, film production companies, the US military, and autonomous vehicle firms as potential customers. Now, the entire team reports to James Philbin, who leads Rivian's autonomy and AI group.

Philbin stated that simulation is central to how the company trains and validates its autonomous driving systems. He noted that Third Dimension has built technology that turns real-world data into detailed 3D environments. This approach leverages footage from owners of the R1S, R1T, R2, and commercial vans who opt into camera data sharing. Engineers can recreate rare events, such as a mattress in the fast lane or a child running between parked cars, and alter the variables to stress-test the software.

The deal expands Rivian's presence in London, as most of the acquired staff are based there. The move comes as Rivian faces tight deadlines for its robotaxi rollout. In March, Uber agreed to invest up to $1.25 billion in Rivian to deploy R2 robotaxis. Only $300 million is paid upfront, with the remainder tied to autonomy milestones, including 10,000 driverless R2 vehicles on Uber's network in San Francisco and Miami starting in 2028.

Rivian's consumer timelines have already shifted. The point-to-point driving feature is due to reach a small group of invited Autonomy+ owners later this year, with testers required to sign a nondisclosure agreement. Eyes-off driving, which CEO RJ Scaringe originally promised for 2026, is now targeted for 2027. Level 4 capability is planned for 2028 on the Gen 3 hardware revealed at the company's AI & Autonomy Day.

Other manufacturers have pursued similar strategies. Waymo unveiled its World Model in February, built on Google DeepMind's Genie 3, to generate scenarios its vehicles have not encountered. Tesla has also demonstrated a neural world simulator for its Full Self-Driving software. The acquisition of Third Dimension positions Rivian to process its massive daily data stream into actionable training material.