Midnight Crowd: Pedestrian Wave Dynamics

A New Year's Eve crowd circles a countdown tower on a closed plaza avenue, rendered in full 3D. Each pedestrian follows only Helbing & Molnár's social-force equations — a desired tangential velocity plus an anisotropic, front-weighted exponential repulsion from nearby agents and lampposts — with no scripted paths anywhere. Raise the density or the bidirectional flow ratio and watch lane formation emerge from bidirectional streams, then push further to trigger genuine stop-and-go density waves rolling backward around the ring, tracked live in the scrolling density strip.