Motion Planning in 2026: From RRT* to Neural Time Fields (NTFields)
Motion Planning in the Era of Physical AI In traditional robotics, motion planning was a reactive game of "don't touch the obstacles." Today, as humanoids enter our factories and construction sites, the game has changed. We are moving toward Agentic AI —systems that don't just follow a path but understand the physics of their journey. 1. The Fundamentals: Navigating the Configuration Space Before a robot can move, it must translate the physical world into a mathematical one. The Configuration Space (C-Space) The robot’s position is defined by its Configuration ( $q$ ) . The set of all possible $q$ is the Configuration Space ( $C$ ) . $C_{free}$ : The subset of configurations where the robot is not in collision. $C_{obs}$ : The subset of configurations that lead to a collision. Mathematically, the goal of motion planning is to find a continuous path $\tau: [0, 1] \to C_{free}$ such that $\tau(0) = q_{start}$ and $\tau(1) = q_{goal}$ . Sampling-Based vs. Opt...