When the first Grand Theft Auto VI trailer was released, one of the scenes that most amazed development professionals was the bodily movement of the pedestrians in Ocean Beach: the cadence of footsteps on the soft sand, the inertia when turning, and the natural swaying of characters walking barefoot or in heels.
It was not a cinematic illusion or an externally rendered cutscene: behind that naturalness lies one of the most complex technologies ever registered by Rockstar’s parent company, Take-Two Interactive.
We are talking about the official US patent titled “System and Method for Virtual Character Locomotion”, developed by Tobias Kleanthous, who was the director of animation technology and AI at Rockstar Games for almost a decade.
We analyze how this technology works and why it will radically change the gameplay feel of Jason and Lucia.
The problem with traditional video games: Canned animations
In virtually all conventional open-world games (including GTA V), character movement is based on a finite library of captured animations:
- There is a fixed animation for “walking forward”.
- Another fixed animation for “running at 45 degrees”.
- And a transition animation when the player releases the joystick to stop.
For the character to react to different states (such as being injured, drunk, wet, or carrying a heavy weapon), developers had to record dozens of complete versions of each movement and blend them together (blending). This caused the well-known visual defects: feet sliding on the asphalt (foot sliding), robotic turns on their own axis, and a lack of a real sense of weight and inertia.
The GTA 6 solution: Procedural modular blocks
Kleanthous’s patent revolutionizes this approach by breaking down each movement into small elementary biomechanical blocks:
Instead of storing a complete 5-second animation of a character running, GTA 6’s RAGE engine assembles movement in real time by combining independent kinematic nodes:
- Physical state of the character: Stamina or exhaustion level, injuries to specific limbs, and the body mass of the 3D model.
- Load and equipment: The weight of the bulletproof vest, carrying an assault rifle slung over the shoulder, or wielding two handguns automatically modifies the torso inclination and the center of gravity.
- Contact surface: The engine calculates the friction and resistance of the terrain. Lucia’s step on dry concrete is firm and fast; when crossing the swampy mud of the Grassrivers or the shallow waters of the Keys, the leg muscles apply procedural upward force to lift the foot, exactly as it would happen in real life.
- Atmospheric conditions: The hurricane winds of Leonida’s tropical storms push the character’s posture, forcing them to lean forward to maintain balance.
Coexistence between realistic inertia and immediate response
One of the biggest debates in the community after Red Dead Redemption 2 was the weight of Arthur Morgan’s controls: for many it was highly immersive, but other players felt the character took too long to turn or stop during intense gunfights.
The GTA VI locomotion patent specifically addresses this balance:
- Separation of upper and lower body layers: The legs manage inertia, traction, and terrain procedurally, while the torso and arms maintain an instantaneous 60 Hz aiming response time.
- Reactive recovery after impacts (Euphoria Next-Gen): When Jason or Lucia trip over a curb or get grazed by a bullet, the system does not trigger a fixed falling animation; it calculates the trajectory of the imbalance and automatically searches with feet or hands for the nearest support point to cushion the blow.
This architecture explains why the early leaks and official footage convey an organic feel that no other graphics engine has managed to match on the massive scale of an open world.