The deal has been announced following several months of close collaboration between the two companies, with Rockstar's integration of the euphoria technology (pictured above) described as 'well advanced'.
While further announcements on the specific games the tool will be integrated into are due later in the year, the studio has already announced that its next Grand Theft Auto title will debut on Xbox 360 and PS3 later this year and the game is presumably one of the first candidates to benefit.
“Euphoria is about giving people an interactive experience they have never seen before. We now have the processing power to simulate humans, and the possibilities for games are endless,” said Torsten Reil, CEO of NaturalMotion.
“In Rockstar, we have found a partner that shares this vision, and is renowned for creating some of the most ground-breaking and immersive games in the industry. We are thrilled and honored to work with a partner of such high caliber, and look forward to helping create amazing titles.”