https://wccftech.com/rockstar-euphoria-evolved-rdr2/

One of the biggest innovations in the field of animation happened with Grand Theft Auto IV when Rockstar first employed the Euphoria engine, the software originally developed by NaturalMotion. It allowed characters to move and interact with each other in very realistic ways thanks to procedural animation. Since then, though, Rockstar fans have been on the opinion that the developers have toned down this particular aspect in their games, particularly in Grand Theft Auto V.

In an interview published yesterday by VG247, Phil Hooker, Rockstar North’s director of technology, finally discussed how the developers have evolved Euphoria in Red Dead Redemption 2.