🚗 Vehicle Steering Dynamics — 3D Bicycle Model

The 2D page filed under this title actually renders Craig Reynolds' autonomous steering behaviors (seek, flee, arrive, wander, separate) — a boids-style agent demo, not a vehicle. This 3D companion instead builds the mechanic the title and description actually promise: a real car steered by its front wheels, driven by the kinematic bicycle model engineers use for real vehicle path-planning. Wheelbase L and steering angle δ set the yaw rate ψ′ = (v/L)·tan(δ), which is integrated every frame into the car's heading and position — so the same turning-angle-to-momentum relationship the catalogue description describes is now something you can actually see and measure: a live turning-radius circle traced under the car, a fading tire trail showing the path it carves, and a numeric readout of speed, turning radius, yaw rate and lateral acceleration that update in real time as you drag the sliders or click the road to steer toward a point.